Update pyproject.toml

Adds checks for missing 'transformers' dependency and network errors in the matting endpoint, returning clear error messages for common failure cases. Updates the frontend to display more informative alerts to users when matting fails, including details from server responses.

canvas_node.py

@@ -10,7 +10,12 @@ import threading
 import os
 from tqdm import tqdm
 from torchvision import transforms
-from transformers import AutoModelForImageSegmentation, PretrainedConfig
+try:
+    from transformers import AutoModelForImageSegmentation, PretrainedConfig
+    from requests.exceptions import ConnectionError as RequestsConnectionError
+    TRANSFORMERS_AVAILABLE = True
+except ImportError:
+    TRANSFORMERS_AVAILABLE = False
 import torch.nn.functional as F
 import traceback
 import uuid
@@ -712,25 +717,31 @@ _matting_lock = None
 async def matting(request):
     global _matting_lock
 
+    if not TRANSFORMERS_AVAILABLE:
+        log_error("Matting request failed: 'transformers' library is not installed.")
+        return web.json_response({
+            "error": "Dependency Not Found",
+            "details": "The 'transformers' library is required for the matting feature. Please install it by running: pip install transformers"
+        }, status=400)
+
     if _matting_lock is not None:
         log_warn("Matting already in progress, rejecting request")
         return web.json_response({
             "error": "Another matting operation is in progress",
             "details": "Please wait for the current operation to complete"
-        }, status=429)  # 429 Too Many Requests
+        }, status=429)
 
     _matting_lock = True
-    
     try:
         log_info("Received matting request")
         data = await request.json()
 
-        matting = BiRefNetMatting()
+        matting_instance = BiRefNetMatting()
 
         image_tensor, original_alpha = convert_base64_to_tensor(data["image"])
         log_debug(f"Input image shape: {image_tensor.shape}")
 
-        matted_image, alpha_mask = matting.execute(
+        matted_image, alpha_mask = matting_instance.execute(
             image_tensor,
             "BiRefNet/model.safetensors",
             threshold=data.get("threshold", 0.5),
@@ -745,14 +756,26 @@ async def matting(request):
             "alpha_mask": result_mask
         })
 
-    except Exception as e:
-        log_exception(f"Error in matting endpoint: {str(e)}")
+    except RequestsConnectionError as e:
+        log_error(f"Connection error during matting model download: {e}")
         return web.json_response({
-            "error": str(e),
+            "error": "Network Connection Error",
+            "details": "Failed to download the matting model from Hugging Face. Please check your internet connection."
+        }, status=400)
+    except Exception as e:
+        log_exception(f"Error in matting endpoint: {e}")
+        # Check for offline error message from Hugging Face
+        if "Offline mode is enabled" in str(e) or "Can't load 'ZhengPeng7/BiRefNet' offline" in str(e):
+            return web.json_response({
+                "error": "Network Connection Error",
+                "details": "Failed to download the matting model from Hugging Face. Please check your internet connection and ensure you are not in offline mode."
+            }, status=400)
+
+        return web.json_response({
+            "error": "An unexpected error occurred",
             "details": traceback.format_exc()
         }, status=500)
     finally:
-
         _matting_lock = None
         log_debug("Matting lock released")
 

js/Canvas.js

@@ -5,11 +5,13 @@ import {MaskTool} from "./MaskTool.js";
 import {CanvasState} from "./CanvasState.js";
 import {CanvasInteractions} from "./CanvasInteractions.js";
 import {CanvasLayers} from "./CanvasLayers.js";
+import {CanvasLayersPanel} from "./CanvasLayersPanel.js";
 import {CanvasRenderer} from "./CanvasRenderer.js";
 import {CanvasIO} from "./CanvasIO.js";
 import {ImageReferenceManager} from "./ImageReferenceManager.js";
 import {createModuleLogger} from "./utils/LoggerUtils.js";
 import {mask_editor_showing, mask_editor_listen_for_cancel} from "./utils/mask_utils.js";
+import { debounce } from "./utils/CommonUtils.js";
 
 const log = createModuleLogger('Canvas');
 
@@ -141,10 +143,14 @@ export class Canvas {
     _initializeModules(callbacks) {
         log.debug('Initializing Canvas modules...');
 
+        // Stwórz opóźnioną wersję funkcji zapisu stanu
+        this.requestSaveState = debounce(this.saveState.bind(this), 500);
+
         this.maskTool = new MaskTool(this, {onStateChange: this.onStateChange});
         this.canvasState = new CanvasState(this);
         this.canvasInteractions = new CanvasInteractions(this);
         this.canvasLayers = new CanvasLayers(this);
+        this.canvasLayersPanel = new CanvasLayersPanel(this);
         this.canvasRenderer = new CanvasRenderer(this);
         this.canvasIO = new CanvasIO(this);
         this.imageReferenceManager = new ImageReferenceManager(this);
@@ -180,6 +186,11 @@ export class Canvas {
         }
         this.saveState();
         this.render();
+
+        // Dodaj to wywołanie, aby panel renderował się po załadowaniu stanu
+        if (this.canvasLayersPanel) {
+            this.canvasLayersPanel.onLayersChanged();
+        }
     }
 
     /**
@@ -205,6 +216,12 @@ export class Canvas {
         this.incrementOperationCount();
         this._notifyStateChange();
 
+        // Powiadom panel warstw o zmianie stanu warstw
+        if (this.canvasLayersPanel) {
+            this.canvasLayersPanel.onLayersChanged();
+            this.canvasLayersPanel.onSelectionChanged();
+        }
+
         log.debug('Undo completed, layers count:', this.layers.length);
     }
 
@@ -221,6 +238,12 @@ export class Canvas {
         this.incrementOperationCount();
         this._notifyStateChange();
 
+        // Powiadom panel warstw o zmianie stanu warstw
+        if (this.canvasLayersPanel) {
+            this.canvasLayersPanel.onLayersChanged();
+            this.canvasLayersPanel.onSelectionChanged();
+        }
+
         log.debug('Redo completed, layers count:', this.layers.length);
     }
 
@@ -238,7 +261,14 @@ export class Canvas {
      * @param {string} addMode - Tryb dodawania
      */
     async addLayer(image, layerProps = {}, addMode = 'default') {
-        return this.canvasLayers.addLayerWithImage(image, layerProps, addMode);
+        const result = await this.canvasLayers.addLayerWithImage(image, layerProps, addMode);
+        
+        // Powiadom panel warstw o dodaniu nowej warstwy
+        if (this.canvasLayersPanel) {
+            this.canvasLayersPanel.onLayersChanged();
+        }
+        
+        return result;
     }
 
     /**
@@ -253,10 +283,16 @@ export class Canvas {
 
             this.saveState();
             this.layers = this.layers.filter(l => !this.selectedLayers.includes(l));
-            this.updateSelection([]);
+            
+            this.updateSelection([]); 
+            
             this.render();
             this.saveState();
 
+            if (this.canvasLayersPanel) {
+                this.canvasLayersPanel.onLayersChanged();
+            }
+
             log.debug('Layers removed successfully, remaining layers:', this.layers.length);
         } else {
             log.debug('No layers selected for removal');
@@ -264,23 +300,118 @@ export class Canvas {
     }
 
     /**
-     * Aktualizuje zaznaczenie warstw
+     * Duplikuje zaznaczone warstwy (w pamięci, bez zapisu stanu)
+     */
+    duplicateSelectedLayers() {
+        if (this.selectedLayers.length === 0) return [];
+
+        const newLayers = [];
+        const sortedLayers = [...this.selectedLayers].sort((a,b) => a.zIndex - b.zIndex);
+        
+        sortedLayers.forEach(layer => {
+            const newLayer = {
+                ...layer,
+                id: `layer_${+new Date()}_${Math.random().toString(36).substr(2, 9)}`,
+                zIndex: this.layers.length, // Nowa warstwa zawsze na wierzchu
+            };
+            this.layers.push(newLayer);
+            newLayers.push(newLayer);
+        });
+
+        // Aktualizuj zaznaczenie, co powiadomi panel (ale nie renderuje go całego)
+        this.updateSelection(newLayers);
+        
+        // Powiadom panel o zmianie struktury, aby się przerysował
+        if (this.canvasLayersPanel) {
+            this.canvasLayersPanel.onLayersChanged();
+        }
+        
+        log.info(`Duplicated ${newLayers.length} layers (in-memory).`);
+        return newLayers;
+    }
+
+    /**
+     * Aktualizuje zaznaczenie warstw i powiadamia wszystkie komponenty.
+     * To jest "jedyne źródło prawdy" o zmianie zaznaczenia.
      * @param {Array} newSelection - Nowa lista zaznaczonych warstw
      */
     updateSelection(newSelection) {
         const previousSelection = this.selectedLayers.length;
         this.selectedLayers = newSelection || [];
         this.selectedLayer = this.selectedLayers.length > 0 ? this.selectedLayers[this.selectedLayers.length - 1] : null;
+        
+        // Sprawdź, czy zaznaczenie faktycznie się zmieniło, aby uniknąć pętli
+        const hasChanged = previousSelection !== this.selectedLayers.length || 
+                           this.selectedLayers.some((layer, i) => this.selectedLayers[i] !== (newSelection || [])[i]);
+
+        if (!hasChanged && previousSelection > 0) {
+           // return; // Zablokowane na razie, może powodować problemy
+        }
 
         log.debug('Selection updated', {
             previousCount: previousSelection,
             newCount: this.selectedLayers.length,
             selectedLayerIds: this.selectedLayers.map(l => l.id || 'unknown')
         });
+        
+        // 1. Zrenderuj ponownie canvas, aby pokazać nowe kontrolki transformacji
+        this.render();
 
+        // 2. Powiadom inne części aplikacji (jeśli są)
         if (this.onSelectionChange) {
             this.onSelectionChange();
         }
+
+        // 3. Powiadom panel warstw, aby zaktualizował swój wygląd
+        if (this.canvasLayersPanel) {
+            this.canvasLayersPanel.onSelectionChanged();
+        }
+    }
+
+    /**
+     * Logika aktualizacji zaznaczenia, wywoływana przez panel warstw.
+     */
+    updateSelectionLogic(layer, isCtrlPressed, isShiftPressed, index) {
+        let newSelection = [...this.selectedLayers];
+        let selectionChanged = false;
+
+        if (isShiftPressed && this.canvasLayersPanel.lastSelectedIndex !== -1) {
+            const sortedLayers = [...this.layers].sort((a, b) => b.zIndex - a.zIndex);
+            const startIndex = Math.min(this.canvasLayersPanel.lastSelectedIndex, index);
+            const endIndex = Math.max(this.canvasLayersPanel.lastSelectedIndex, index);
+            
+            newSelection = [];
+            for (let i = startIndex; i <= endIndex; i++) {
+                if (sortedLayers[i]) {
+                    newSelection.push(sortedLayers[i]);
+                }
+            }
+            selectionChanged = true;
+        } else if (isCtrlPressed) {
+            const layerIndex = newSelection.indexOf(layer);
+            if (layerIndex === -1) {
+                newSelection.push(layer);
+            } else {
+                newSelection.splice(layerIndex, 1);
+            }
+            this.canvasLayersPanel.lastSelectedIndex = index;
+            selectionChanged = true;
+        } else {
+            // Jeśli kliknięta warstwa nie jest częścią obecnego zaznaczenia,
+            // wyczyść zaznaczenie i zaznacz tylko ją.
+            if (!this.selectedLayers.includes(layer)) {
+                newSelection = [layer];
+                selectionChanged = true;
+            }
+            // Jeśli kliknięta warstwa JEST już zaznaczona (potencjalnie z innymi),
+            // NIE rób nic, aby umożliwić przeciąganie całej grupy.
+            this.canvasLayersPanel.lastSelectedIndex = index;
+        }
+
+        // Aktualizuj zaznaczenie tylko jeśli faktycznie się zmieniło
+        if (selectionChanged) {
+            this.updateSelection(newSelection);
+        }
     }
 
     /**

js/CanvasInteractions.js

@@ -19,6 +19,7 @@ export class CanvasInteractions {
             hasClonedInDrag: false,
             lastClickTime: 0,
             transformingLayer: null,
+            keyMovementInProgress: false, // Flaga do śledzenia ruchu klawiszami
         };
         this.originalLayerPositions = new Map();
         this.interaction.canvasResizeRect = null;
@@ -69,47 +70,33 @@ export class CanvasInteractions {
         const worldCoords = this.canvas.getMouseWorldCoordinates(e);
         const viewCoords = this.canvas.getMouseViewCoordinates(e);
 
-        if (this.canvas.maskTool.isActive) {
-            if (e.button === 1) {
-                this.startPanning(e);
-            } else {
-                this.canvas.maskTool.handleMouseDown(worldCoords, viewCoords);
-            }
-            this.canvas.render();
-            return;
-        }
+        // --- Ostateczna, poprawna kolejność sprawdzania ---
 
-        const currentTime = Date.now();
+        // 1. Akcje globalne z modyfikatorami (mają najwyższy priorytet)
         if (e.shiftKey && e.ctrlKey) {
             this.startCanvasMove(worldCoords);
-            this.canvas.render();
             return;
         }
-
-        if (currentTime - this.interaction.lastClickTime < 300) {
-            this.canvas.updateSelection([]);
-            this.canvas.selectedLayer = null;
-            this.resetInteractionState();
-            this.canvas.render();
-            return;
-        }
-        this.interaction.lastClickTime = currentTime;
-
-        if (e.button === 2) {
-            const clickedLayerResult = this.canvas.canvasLayers.getLayerAtPosition(worldCoords.x, worldCoords.y);
-            if (clickedLayerResult && this.canvas.selectedLayers.includes(clickedLayerResult.layer)) {
-                e.preventDefault(); // Prevent context menu
-                this.canvas.canvasLayers.showBlendModeMenu(viewCoords.x ,viewCoords.y);
-                return;
-            }
-        }
-
         if (e.shiftKey) {
             this.startCanvasResize(worldCoords);
-            this.canvas.render();
+            return;
+        }
+        
+        // 2. Inne przyciski myszy
+        if (e.button === 2) { // Prawy przycisk myszy
+            const clickedLayerResult = this.canvas.canvasLayers.getLayerAtPosition(worldCoords.x, worldCoords.y);
+            if (clickedLayerResult && this.canvas.selectedLayers.includes(clickedLayerResult.layer)) {
+                e.preventDefault();
+                this.canvas.canvasLayers.showBlendModeMenu(viewCoords.x, viewCoords.y);
+            }
+            return; 
+        }
+        if (e.button !== 0) { // Środkowy przycisk
+            this.startPanning(e);
             return;
         }
 
+        // 3. Interakcje z elementami na płótnie (lewy przycisk)
         const transformTarget = this.canvas.canvasLayers.getHandleAtPosition(worldCoords.x, worldCoords.y);
         if (transformTarget) {
             this.startLayerTransform(transformTarget.layer, transformTarget.handle, worldCoords);
@@ -118,32 +105,31 @@ export class CanvasInteractions {
 
         const clickedLayerResult = this.canvas.canvasLayers.getLayerAtPosition(worldCoords.x, worldCoords.y);
         if (clickedLayerResult) {
-            this.startLayerDrag(clickedLayerResult.layer, worldCoords);
+            this.prepareForDrag(clickedLayerResult.layer, worldCoords);
             return;
         }
         
-        this.startPanning(e);
-
-        this.canvas.render();
+        // 4. Domyślna akcja na tle (lewy przycisk bez modyfikatorów)
+        this.startPanningOrClearSelection(e);
     }
 
     handleMouseMove(e) {
         const worldCoords = this.canvas.getMouseWorldCoordinates(e);
-        const viewCoords = this.canvas.getMouseViewCoordinates(e);
-        this.canvas.lastMousePosition = worldCoords;
-
-        if (this.canvas.maskTool.isActive) {
-            if (this.interaction.mode === 'panning') {
-                this.panViewport(e);
-                return;
+        this.canvas.lastMousePosition = worldCoords; // Zawsze aktualizuj ostatnią pozycję myszy
+        
+        // Sprawdź, czy rozpocząć przeciąganie
+        if (this.interaction.mode === 'potential-drag') {
+            const dx = worldCoords.x - this.interaction.dragStart.x;
+            const dy = worldCoords.y - this.interaction.dragStart.y;
+            if (Math.sqrt(dx * dx + dy * dy) > 3) { // Próg 3 pikseli
+                this.interaction.mode = 'dragging';
+                this.originalLayerPositions.clear();
+                this.canvas.selectedLayers.forEach(l => {
+                    this.originalLayerPositions.set(l, {x: l.x, y: l.y});
+                });
             }
-            this.canvas.maskTool.handleMouseMove(worldCoords, viewCoords);
-            if (this.canvas.maskTool.isDrawing) {
-                this.canvas.render();
-            }
-            return;
         }
-
+        
         switch (this.interaction.mode) {
             case 'panning':
                 this.panViewport(e);
@@ -170,31 +156,24 @@ export class CanvasInteractions {
     }
 
     handleMouseUp(e) {
-        const viewCoords = this.canvas.getMouseViewCoordinates(e);
-        if (this.canvas.maskTool.isActive) {
-            if (this.interaction.mode === 'panning') {
-                this.resetInteractionState();
-            } else {
-                this.canvas.maskTool.handleMouseUp(viewCoords);
-            }
-            this.canvas.render();
-            return;
-        }
-
-        const interactionEnded = this.interaction.mode !== 'none' && this.interaction.mode !== 'panning';
-
         if (this.interaction.mode === 'resizingCanvas') {
             this.finalizeCanvasResize();
-        } else if (this.interaction.mode === 'movingCanvas') {
+        }
+        if (this.interaction.mode === 'movingCanvas') {
             this.finalizeCanvasMove();
         }
-        this.resetInteractionState();
-        this.canvas.render();
 
-        if (interactionEnded) {
+        // Zapisz stan tylko, jeśli faktycznie doszło do zmiany (przeciąganie, transformacja, duplikacja)
+        const stateChangingInteraction = ['dragging', 'resizing', 'rotating'].includes(this.interaction.mode);
+        const duplicatedInDrag = this.interaction.hasClonedInDrag;
+
+        if (stateChangingInteraction || duplicatedInDrag) {
             this.canvas.saveState();
             this.canvas.canvasState.saveStateToDB(true);
         }
+
+        this.resetInteractionState();
+        this.canvas.render();
     }
 
     handleMouseLeave(e) {
@@ -245,10 +224,22 @@ export class CanvasInteractions {
             this.canvas.viewport.y = worldCoords.y - (mouseBufferY / this.canvas.viewport.zoom);
         } else if (this.canvas.selectedLayer) {
             const rotationStep = 5 * (e.deltaY > 0 ? -1 : 1);
+            const direction = e.deltaY < 0 ? 1 : -1; // 1 = up/right, -1 = down/left
 
             this.canvas.selectedLayers.forEach(layer => {
                 if (e.shiftKey) {
-                    layer.rotation += rotationStep;
+                    // Nowy skrót: Shift + Ctrl + Kółko do przyciągania do absolutnych wartości
+                    if (e.ctrlKey) {
+                        const snapAngle = 5;
+                        if (direction > 0) { // Obrót w górę/prawo
+                            layer.rotation = Math.ceil((layer.rotation + 0.1) / snapAngle) * snapAngle;
+                        } else { // Obrót w dół/lewo
+                            layer.rotation = Math.floor((layer.rotation - 0.1) / snapAngle) * snapAngle;
+                        }
+                    } else {
+                        // Stara funkcjonalność: Shift + Kółko obraca o stały krok
+                        layer.rotation += rotationStep;
+                    }
                 } else {
                     const oldWidth = layer.width;
                     const oldHeight = layer.height;
@@ -307,112 +298,81 @@ export class CanvasInteractions {
         }
         this.canvas.render();
         if (!this.canvas.maskTool.isActive) {
-            this.canvas.saveState(true);
+            this.canvas.requestSaveState(true); // Użyj opóźnionego zapisu
         }
     }
 
     handleKeyDown(e) {
-        if (this.canvas.maskTool.isActive) {
-            if (e.key === 'Control') this.interaction.isCtrlPressed = true;
-            if (e.key === 'Alt') {
-                this.interaction.isAltPressed = true;
-                e.preventDefault();
-            }
-
-            if (e.ctrlKey) {
-                if (e.key.toLowerCase() === 'z') {
-                    e.preventDefault();
-                    e.stopPropagation();
-                    if (e.shiftKey) {
-                        this.canvas.canvasState.redo();
-                    } else {
-                        this.canvas.canvasState.undo();
-                    }
-                    return;
-                }
-                if (e.key.toLowerCase() === 'y') {
-                    e.preventDefault();
-                    e.stopPropagation();
-                    this.canvas.canvasState.redo();
-                    return;
-                }
-            }
-            return;
-        }
-
         if (e.key === 'Control') this.interaction.isCtrlPressed = true;
         if (e.key === 'Alt') {
             this.interaction.isAltPressed = true;
             e.preventDefault();
         }
 
-        if (e.ctrlKey) {
-            if (e.key.toLowerCase() === 'z') {
+        // Globalne skróty (Undo/Redo/Copy/Paste)
+        if (e.ctrlKey || e.metaKey) {
+            let handled = true;
+            switch (e.key.toLowerCase()) {
+                case 'z':
+                    if (e.shiftKey) {
+                        this.canvas.redo();
+                    } else {
+                        this.canvas.undo();
+                    }
+                    break;
+                case 'y':
+                    this.canvas.redo();
+                    break;
+                case 'c':
+                    if (this.canvas.selectedLayers.length > 0) {
+                        this.canvas.canvasLayers.copySelectedLayers();
+                    }
+                    break;
+                case 'v':
+                     this.canvas.canvasLayers.handlePaste('mouse');
+                    break;
+                default:
+                    handled = false;
+                    break;
+            }
+            if (handled) {
                 e.preventDefault();
                 e.stopPropagation();
-                if (e.shiftKey) {
-                    this.canvas.canvasState.redo();
-                } else {
-                    this.canvas.canvasState.undo();
-                }
-                return;
-            }
-            if (e.key.toLowerCase() === 'y') {
-                e.preventDefault();
-                e.stopPropagation();
-                this.canvas.canvasState.redo();
-                return;
-            }
-            if (e.key.toLowerCase() === 'c') {
-                if (this.canvas.selectedLayers.length > 0) {
-                    this.canvas.canvasLayers.copySelectedLayers();
-                }
-                return;
-            }
-            if (e.key.toLowerCase() === 'v') {
-
-
                 return;
             }
         }
 
-        if (this.canvas.selectedLayer) {
-            if (e.key === 'Delete') {
-                e.preventDefault();
-                e.stopPropagation();
-                this.canvas.saveState();
-                this.canvas.layers = this.canvas.layers.filter(l => !this.canvas.selectedLayers.includes(l));
-                this.canvas.updateSelection([]);
-                this.canvas.render();
-                return;
-            }
-
+        // Skróty kontekstowe (zależne od zaznaczenia)
+        if (this.canvas.selectedLayers.length > 0) {
             const step = e.shiftKey ? 10 : 1;
             let needsRender = false;
-            switch (e.code) {
-                case 'ArrowLeft':
-                case 'ArrowRight':
-                case 'ArrowUp':
-                case 'ArrowDown':
-                case 'BracketLeft':
-                case 'BracketRight':
-                    e.preventDefault();
-                    e.stopPropagation();
+            
+            // Używamy e.code dla spójności i niezależności od układu klawiatury
+            const movementKeys = ['ArrowLeft', 'ArrowRight', 'ArrowUp', 'ArrowDown', 'BracketLeft', 'BracketRight'];
+            if (movementKeys.includes(e.code)) {
+                e.preventDefault();
+                e.stopPropagation();
+                this.interaction.keyMovementInProgress = true;
 
-                    if (e.code === 'ArrowLeft') this.canvas.selectedLayers.forEach(l => l.x -= step);
-                    if (e.code === 'ArrowRight') this.canvas.selectedLayers.forEach(l => l.x += step);
-                    if (e.code === 'ArrowUp') this.canvas.selectedLayers.forEach(l => l.y -= step);
-                    if (e.code === 'ArrowDown') this.canvas.selectedLayers.forEach(l => l.y += step);
-                    if (e.code === 'BracketLeft') this.canvas.selectedLayers.forEach(l => l.rotation -= step);
-                    if (e.code === 'BracketRight') this.canvas.selectedLayers.forEach(l => l.rotation += step);
-
-                    needsRender = true;
-                    break;
+                if (e.code === 'ArrowLeft') this.canvas.selectedLayers.forEach(l => l.x -= step);
+                if (e.code === 'ArrowRight') this.canvas.selectedLayers.forEach(l => l.x += step);
+                if (e.code === 'ArrowUp') this.canvas.selectedLayers.forEach(l => l.y -= step);
+                if (e.code === 'ArrowDown') this.canvas.selectedLayers.forEach(l => l.y += step);
+                if (e.code === 'BracketLeft') this.canvas.selectedLayers.forEach(l => l.rotation -= step);
+                if (e.code === 'BracketRight') this.canvas.selectedLayers.forEach(l => l.rotation += step);
+                
+                needsRender = true;
             }
 
+            if (e.key === 'Delete' || e.key === 'Backspace') {
+                e.preventDefault();
+                e.stopPropagation();
+                this.canvas.removeSelectedLayers();
+                return;
+            }
+            
             if (needsRender) {
                 this.canvas.render();
-                this.canvas.saveState();
             }
         }
     }
@@ -420,6 +380,12 @@ export class CanvasInteractions {
     handleKeyUp(e) {
         if (e.key === 'Control') this.interaction.isCtrlPressed = false;
         if (e.key === 'Alt') this.interaction.isAltPressed = false;
+
+        const movementKeys = ['ArrowLeft', 'ArrowRight', 'ArrowUp', 'ArrowDown', 'BracketLeft', 'BracketRight'];
+        if (movementKeys.includes(e.code) && this.interaction.keyMovementInProgress) {
+            this.canvas.requestSaveState(); // Użyj opóźnionego zapisu
+            this.interaction.keyMovementInProgress = false;
+        }
     }
 
     updateCursor(worldCoords) {
@@ -466,31 +432,34 @@ export class CanvasInteractions {
         this.canvas.render();
     }
 
-    startLayerDrag(layer, worldCoords) {
-        this.interaction.mode = 'dragging';
-        this.interaction.dragStart = {...worldCoords};
-
-        let currentSelection = [...this.canvas.selectedLayers];
-
+    prepareForDrag(layer, worldCoords) {
+        // Zaktualizuj zaznaczenie, ale nie zapisuj stanu
         if (this.interaction.isCtrlPressed) {
-            const index = currentSelection.indexOf(layer);
+            const index = this.canvas.selectedLayers.indexOf(layer);
             if (index === -1) {
-                currentSelection.push(layer);
+                this.canvas.updateSelection([...this.canvas.selectedLayers, layer]);
             } else {
-                currentSelection.splice(index, 1);
+                const newSelection = this.canvas.selectedLayers.filter(l => l !== layer);
+                this.canvas.updateSelection(newSelection);
             }
         } else {
-            if (!currentSelection.includes(layer)) {
-                currentSelection = [layer];
+            if (!this.canvas.selectedLayers.includes(layer)) {
+                this.canvas.updateSelection([layer]);
             }
         }
+        
+        this.interaction.mode = 'potential-drag';
+        this.interaction.dragStart = {...worldCoords};
+    }
 
-        this.canvas.updateSelection(currentSelection);
-
-        this.originalLayerPositions.clear();
-        this.canvas.selectedLayers.forEach(l => {
-            this.originalLayerPositions.set(l, {x: l.x, y: l.y});
-        });
+    startPanningOrClearSelection(e) {
+        // Ta funkcja jest teraz wywoływana tylko gdy kliknięto na tło bez modyfikatorów.
+        // Domyślna akcja: wyczyść zaznaczenie i rozpocznij panoramowanie.
+        if (!this.interaction.isCtrlPressed) {
+            this.canvas.updateSelection([]);
+        }
+        this.interaction.mode = 'panning';
+        this.interaction.panStart = {x: e.clientX, y: e.clientY};
     }
 
     startCanvasResize(worldCoords) {
@@ -549,6 +518,7 @@ export class CanvasInteractions {
             this.canvas.viewport.y -= finalY;
         }
         this.canvas.render();
+        this.canvas.saveState();
     }
 
     startPanning(e) {
@@ -570,19 +540,12 @@ export class CanvasInteractions {
 
     dragLayers(worldCoords) {
         if (this.interaction.isAltPressed && !this.interaction.hasClonedInDrag && this.canvas.selectedLayers.length > 0) {
-            const newLayers = [];
-            this.canvas.selectedLayers.forEach(layer => {
-                const newLayer = {
-                    ...layer,
-                    zIndex: this.canvas.layers.length,
-                };
-                this.canvas.layers.push(newLayer);
-                newLayers.push(newLayer);
-            });
-            this.canvas.updateSelection(newLayers);
-            this.canvas.selectedLayer = newLayers.length > 0 ? newLayers[newLayers.length - 1] : null;
+            // Scentralizowana logika duplikowania
+            const newLayers = this.canvas.duplicateSelectedLayers();
+            
+            // Zresetuj pozycje przeciągania dla nowych, zduplikowanych warstw
             this.originalLayerPositions.clear();
-            this.canvas.selectedLayers.forEach(l => {
+            newLayers.forEach(l => {
                 this.originalLayerPositions.set(l, {x: l.x, y: l.y});
             });
             this.interaction.hasClonedInDrag = true;

js/CanvasLayers.js

@@ -128,6 +128,12 @@ export class CanvasLayers {
 
         this.canvas.updateSelection(newLayers);
         this.canvas.render();
+
+        // Notify the layers panel to update its view
+        if (this.canvas.canvasLayersPanel) {
+            this.canvas.canvasLayersPanel.onLayersChanged();
+        }
+
         log.info(`Pasted ${newLayers.length} layer(s) at mouse position (${mouseX}, ${mouseY}).`);
     }
 
@@ -192,6 +198,11 @@ export class CanvasLayers {
         this.canvas.render();
         this.canvas.saveState();
 
+        // Notify the layers panel to update its view
+        if (this.canvas.canvasLayersPanel) {
+            this.canvas.canvasLayersPanel.onLayersChanged();
+        }
+
         log.info("Layer added successfully");
         return layer;
     }, 'CanvasLayers.addLayerWithImage');
@@ -200,40 +211,93 @@ export class CanvasLayers {
         return this.addLayerWithImage(image);
     }
 
+    /**
+     * Centralna funkcja do przesuwania warstw.
+     * @param {Array} layersToMove - Tablica warstw do przesunięcia.
+     * @param {Object} options - Opcje przesunięcia, np. { direction: 'up' } lub { toIndex: 3 }
+     */
+    moveLayers(layersToMove, options = {}) {
+        if (!layersToMove || layersToMove.length === 0) return;
+
+        let finalLayers;
+
+        if (options.direction) {
+            // Logika dla 'up' i 'down'
+            const allLayers = [...this.canvas.layers];
+            const selectedIndices = new Set(layersToMove.map(l => allLayers.indexOf(l)));
+            
+            if (options.direction === 'up') {
+                const sorted = Array.from(selectedIndices).sort((a, b) => b - a);
+                sorted.forEach(index => {
+                    const targetIndex = index + 1;
+                    if (targetIndex < allLayers.length && !selectedIndices.has(targetIndex)) {
+                        [allLayers[index], allLayers[targetIndex]] = [allLayers[targetIndex], allLayers[index]];
+                    }
+                });
+            } else if (options.direction === 'down') {
+                const sorted = Array.from(selectedIndices).sort((a, b) => a - b);
+                sorted.forEach(index => {
+                    const targetIndex = index - 1;
+                    if (targetIndex >= 0 && !selectedIndices.has(targetIndex)) {
+                        [allLayers[index], allLayers[targetIndex]] = [allLayers[targetIndex], allLayers[index]];
+                    }
+                });
+            }
+            finalLayers = allLayers;
+            
+        } else if (options.toIndex !== undefined) {
+            // Logika dla przeciągania i upuszczania (z panelu)
+            const displayedLayers = [...this.canvas.layers].sort((a, b) => b.zIndex - a.zIndex);
+            const reorderedFinal = [];
+            let inserted = false;
+
+            for (let i = 0; i < displayedLayers.length; i++) {
+                if (i === options.toIndex) {
+                    reorderedFinal.push(...layersToMove);
+                    inserted = true;
+                }
+                const currentLayer = displayedLayers[i];
+                if (!layersToMove.includes(currentLayer)) {
+                    reorderedFinal.push(currentLayer);
+                }
+            }
+            if (!inserted) {
+                reorderedFinal.push(...layersToMove);
+            }
+            finalLayers = reorderedFinal;
+        } else {
+            log.warn("Invalid options for moveLayers", options);
+            return;
+        }
+
+        // Zunifikowana końcówka: aktualizacja zIndex i stanu aplikacji
+        const totalLayers = finalLayers.length;
+        finalLayers.forEach((layer, index) => {
+            // Jeśli przyszły z panelu, zIndex jest odwrócony
+            const zIndex = (options.toIndex !== undefined) ? (totalLayers - 1 - index) : index;
+            layer.zIndex = zIndex;
+        });
+
+        this.canvas.layers = finalLayers;
+        this.canvas.layers.sort((a, b) => a.zIndex - b.zIndex);
+
+        if (this.canvas.canvasLayersPanel) {
+            this.canvas.canvasLayersPanel.onLayersChanged();
+        }
+
+        this.canvas.render();
+        this.canvas.requestSaveState(); // Użyj opóźnionego zapisu
+        log.info(`Moved ${layersToMove.length} layer(s).`);
+    }
+
     moveLayerUp() {
         if (this.canvas.selectedLayers.length === 0) return;
-        const selectedIndicesSet = new Set(this.canvas.selectedLayers.map(layer => this.canvas.layers.indexOf(layer)));
-
-        const sortedIndices = Array.from(selectedIndicesSet).sort((a, b) => b - a);
-
-        sortedIndices.forEach(index => {
-            const targetIndex = index + 1;
-
-            if (targetIndex < this.canvas.layers.length && !selectedIndicesSet.has(targetIndex)) {
-                [this.canvas.layers[index], this.canvas.layers[targetIndex]] = [this.canvas.layers[targetIndex], this.canvas.layers[index]];
-            }
-        });
-        this.canvas.layers.forEach((layer, i) => layer.zIndex = i);
-        this.canvas.render();
-        this.canvas.saveState();
+        this.moveLayers(this.canvas.selectedLayers, { direction: 'up' });
     }
 
     moveLayerDown() {
         if (this.canvas.selectedLayers.length === 0) return;
-        const selectedIndicesSet = new Set(this.canvas.selectedLayers.map(layer => this.canvas.layers.indexOf(layer)));
-
-        const sortedIndices = Array.from(selectedIndicesSet).sort((a, b) => a - b);
-
-        sortedIndices.forEach(index => {
-            const targetIndex = index - 1;
-
-            if (targetIndex >= 0 && !selectedIndicesSet.has(targetIndex)) {
-                [this.canvas.layers[index], this.canvas.layers[targetIndex]] = [this.canvas.layers[targetIndex], this.canvas.layers[index]];
-            }
-        });
-        this.canvas.layers.forEach((layer, i) => layer.zIndex = i);
-        this.canvas.render();
-        this.canvas.saveState();
+        this.moveLayers(this.canvas.selectedLayers, { direction: 'down' });
     }
 
     /**
@@ -248,7 +312,7 @@ export class CanvasLayers {
             layer.height *= scale;
         });
         this.canvas.render();
-        this.canvas.saveState();
+        this.canvas.requestSaveState(); // Użyj opóźnionego zapisu
     }
 
     /**
@@ -262,7 +326,7 @@ export class CanvasLayers {
             layer.rotation += angle;
         });
         this.canvas.render();
-        this.canvas.saveState();
+        this.canvas.requestSaveState(); // Użyj opóźnionego zapisu
     }
 
     getLayerAtPosition(worldX, worldY) {
@@ -318,7 +382,7 @@ export class CanvasLayers {
 
         await Promise.all(promises);
         this.canvas.render();
-        this.canvas.saveState();
+        this.canvas.requestSaveState(); // Użyj opóźnionego zapisu
     }
 
     async mirrorVertical() {
@@ -346,7 +410,7 @@ export class CanvasLayers {
 
         await Promise.all(promises);
         this.canvas.render();
-        this.canvas.saveState();
+        this.canvas.requestSaveState(); // Użyj opóźnionego zapisu
     }
 
     async getLayerImageData(layer) {
@@ -968,4 +1032,157 @@ export class CanvasLayers {
             }, 'image/png');
         });
     }
+
+    /**
+     * Fuses (flattens and merges) selected layers into a single layer
+     */
+    async fuseLayers() {
+        if (this.canvas.selectedLayers.length < 2) {
+            alert("Please select at least 2 layers to fuse.");
+            return;
+        }
+
+        log.info(`Fusing ${this.canvas.selectedLayers.length} selected layers`);
+
+        try {
+            // Save state for undo
+            this.canvas.saveState();
+
+            // Calculate bounding box of all selected layers
+            let minX = Infinity, minY = Infinity, maxX = -Infinity, maxY = -Infinity;
+            this.canvas.selectedLayers.forEach(layer => {
+                const centerX = layer.x + layer.width / 2;
+                const centerY = layer.y + layer.height / 2;
+                const rad = layer.rotation * Math.PI / 180;
+                const cos = Math.cos(rad);
+                const sin = Math.sin(rad);
+
+                const halfW = layer.width / 2;
+                const halfH = layer.height / 2;
+
+                const corners = [
+                    {x: -halfW, y: -halfH},
+                    {x: halfW, y: -halfH},
+                    {x: halfW, y: halfH},
+                    {x: -halfW, y: halfH}
+                ];
+
+                corners.forEach(p => {
+                    const worldX = centerX + (p.x * cos - p.y * sin);
+                    const worldY = centerY + (p.x * sin + p.y * cos);
+
+                    minX = Math.min(minX, worldX);
+                    minY = Math.min(minY, worldY);
+                    maxX = Math.max(maxX, worldX);
+                    maxY = Math.max(maxY, worldY);
+                });
+            });
+
+            const fusedWidth = Math.ceil(maxX - minX);
+            const fusedHeight = Math.ceil(maxY - minY);
+
+            if (fusedWidth <= 0 || fusedHeight <= 0) {
+                log.warn("Calculated fused layer dimensions are invalid");
+                alert("Cannot fuse layers: invalid dimensions calculated.");
+                return;
+            }
+
+            // Create temporary canvas for flattening
+            const tempCanvas = document.createElement('canvas');
+            tempCanvas.width = fusedWidth;
+            tempCanvas.height = fusedHeight;
+            const tempCtx = tempCanvas.getContext('2d', { willReadFrequently: true });
+
+            // Translate context to account for the bounding box offset
+            tempCtx.translate(-minX, -minY);
+
+            // Sort selected layers by z-index and render them
+            const sortedSelection = [...this.canvas.selectedLayers].sort((a, b) => a.zIndex - b.zIndex);
+
+            sortedSelection.forEach(layer => {
+                if (!layer.image) return;
+
+                tempCtx.save();
+                tempCtx.globalCompositeOperation = layer.blendMode || 'normal';
+                tempCtx.globalAlpha = layer.opacity !== undefined ? layer.opacity : 1;
+
+                const centerX = layer.x + layer.width / 2;
+                const centerY = layer.y + layer.height / 2;
+                tempCtx.translate(centerX, centerY);
+                tempCtx.rotate(layer.rotation * Math.PI / 180);
+                tempCtx.drawImage(
+                    layer.image,
+                    -layer.width / 2, -layer.height / 2,
+                    layer.width, layer.height
+                );
+                tempCtx.restore();
+            });
+
+            // Convert flattened canvas to image
+            const fusedImage = new Image();
+            fusedImage.src = tempCanvas.toDataURL();
+            await new Promise((resolve, reject) => {
+                fusedImage.onload = resolve;
+                fusedImage.onerror = reject;
+            });
+
+            // Find the lowest z-index among selected layers to maintain visual order
+            const minZIndex = Math.min(...this.canvas.selectedLayers.map(layer => layer.zIndex));
+
+            // Generate unique ID for the new fused layer
+            const imageId = generateUUID();
+            await saveImage(imageId, fusedImage.src);
+            this.canvas.imageCache.set(imageId, fusedImage.src);
+
+            // Create the new fused layer
+            const fusedLayer = {
+                image: fusedImage,
+                imageId: imageId,
+                x: minX,
+                y: minY,
+                width: fusedWidth,
+                height: fusedHeight,
+                originalWidth: fusedWidth,
+                originalHeight: fusedHeight,
+                rotation: 0,
+                zIndex: minZIndex,
+                blendMode: 'normal',
+                opacity: 1
+            };
+
+            // Remove selected layers from canvas
+            this.canvas.layers = this.canvas.layers.filter(layer => !this.canvas.selectedLayers.includes(layer));
+
+            // Insert the fused layer at the correct position
+            this.canvas.layers.push(fusedLayer);
+
+            // Re-index all layers to maintain proper z-order
+            this.canvas.layers.sort((a, b) => a.zIndex - b.zIndex);
+            this.canvas.layers.forEach((layer, index) => {
+                layer.zIndex = index;
+            });
+
+            // Select the new fused layer
+            this.canvas.updateSelection([fusedLayer]);
+
+            // Render and save state
+            this.canvas.render();
+            this.canvas.saveState();
+
+            // Notify the layers panel to update its view
+            if (this.canvas.canvasLayersPanel) {
+                this.canvas.canvasLayersPanel.onLayersChanged();
+            }
+
+            log.info("Layers fused successfully", {
+                originalLayerCount: sortedSelection.length,
+                fusedDimensions: { width: fusedWidth, height: fusedHeight },
+                fusedPosition: { x: minX, y: minY }
+            });
+
+        } catch (error) {
+            log.error("Error during layer fusion:", error);
+            alert(`Error fusing layers: ${error.message}`);
+        }
+    }
 }

js/CanvasLayersPanel.js

@@ -0,0 +1,676 @@
+import {createModuleLogger} from "./utils/LoggerUtils.js";
+
+const log = createModuleLogger('CanvasLayersPanel');
+
+export class CanvasLayersPanel {
+    constructor(canvas) {
+        this.canvas = canvas;
+        this.container = null;
+        this.layersContainer = null;
+        this.draggedElements = [];
+        this.dragInsertionLine = null;
+        this.isMultiSelecting = false;
+        this.lastSelectedIndex = -1;
+        
+        // Binding metod dla event handlerów
+        this.handleLayerClick = this.handleLayerClick.bind(this);
+        this.handleDragStart = this.handleDragStart.bind(this);
+        this.handleDragOver = this.handleDragOver.bind(this);
+        this.handleDragEnd = this.handleDragEnd.bind(this);
+        this.handleDrop = this.handleDrop.bind(this);
+        
+        log.info('CanvasLayersPanel initialized');
+    }
+
+    /**
+     * Tworzy strukturê HTML panelu warstw
+     */
+    createPanelStructure() {
+        // Główny kontener panelu
+        this.container = document.createElement('div');
+        this.container.className = 'layers-panel';
+        this.container.tabIndex = 0; // Umożliwia fokus na panelu
+        this.container.innerHTML = `
+            <div class="layers-panel-header">
+                <span class="layers-panel-title">Layers</span>
+                <div class="layers-panel-controls">
+                    <button class="layers-btn" id="delete-layer-btn" title="Delete layer">🗑</button>
+                </div>
+            </div>
+            <div class="layers-container" id="layers-container">
+                <!-- Lista warstw będzie renderowana tutaj -->
+            </div>
+        `;
+
+        this.layersContainer = this.container.querySelector('#layers-container');
+        
+        // Dodanie stylów CSS
+        this.injectStyles();
+        
+        // Setup event listeners dla przycisków
+        this.setupControlButtons();
+
+        // Dodaj listener dla klawiatury, aby usuwanie działało z panelu
+        this.container.addEventListener('keydown', (e) => {
+            if (e.key === 'Delete' || e.key === 'Backspace') {
+                e.preventDefault();
+                e.stopPropagation();
+                this.deleteSelectedLayers();
+            }
+        });
+        
+        log.debug('Panel structure created');
+        return this.container;
+    }
+
+    /**
+     * Dodaje style CSS do panelu
+     */
+    injectStyles() {
+        const styleId = 'layers-panel-styles';
+        if (document.getElementById(styleId)) {
+            return; // Style już istnieją
+        }
+
+        const style = document.createElement('style');
+        style.id = styleId;
+        style.textContent = `
+            .layers-panel {
+                background: #2a2a2a;
+                border: 1px solid #3a3a3a;
+                border-radius: 4px;
+                padding: 8px;
+                height: 100%;
+                overflow: hidden;
+                font-family: Arial, sans-serif;
+                font-size: 12px;
+                color: #ffffff;
+                user-select: none;
+                display: flex;
+                flex-direction: column;
+            }
+
+            .layers-panel-header {
+                display: flex;
+                justify-content: space-between;
+                align-items: center;
+                padding-bottom: 8px;
+                border-bottom: 1px solid #3a3a3a;
+                margin-bottom: 8px;
+            }
+
+            .layers-panel-title {
+                font-weight: bold;
+                color: #ffffff;
+            }
+
+            .layers-panel-controls {
+                display: flex;
+                gap: 4px;
+            }
+
+            .layers-btn {
+                background: #3a3a3a;
+                border: 1px solid #4a4a4a;
+                color: #ffffff;
+                padding: 4px 8px;
+                border-radius: 3px;
+                cursor: pointer;
+                font-size: 11px;
+            }
+
+            .layers-btn:hover {
+                background: #4a4a4a;
+            }
+
+            .layers-btn:active {
+                background: #5a5a5a;
+            }
+
+            .layers-container {
+                flex: 1;
+                overflow-y: auto;
+                overflow-x: hidden;
+            }
+
+            .layer-row {
+                display: flex;
+                align-items: center;
+                padding: 6px 4px;
+                margin-bottom: 2px;
+                border-radius: 3px;
+                cursor: pointer;
+                transition: background-color 0.15s ease;
+                position: relative;
+                gap: 6px;
+            }
+
+            .layer-row:hover {
+                background: rgba(255, 255, 255, 0.05);
+            }
+
+            .layer-row.selected {
+                background: #2d5aa0 !important;
+                box-shadow: inset 0 0 0 1px #4a7bc8;
+            }
+
+            .layer-row.dragging {
+                opacity: 0.6;
+            }
+
+
+            .layer-thumbnail {
+                width: 48px;
+                height: 48px;
+                border: 1px solid #4a4a4a;
+                border-radius: 2px;
+                background: transparent;
+                position: relative;
+                flex-shrink: 0;
+                overflow: hidden;
+            }
+
+            .layer-thumbnail canvas {
+                width: 100%;
+                height: 100%;
+                display: block;
+            }
+
+            .layer-thumbnail::before {
+                content: '';
+                position: absolute;
+                top: 0;
+                left: 0;
+                right: 0;
+                bottom: 0;
+                background-image: 
+                    linear-gradient(45deg, #555 25%, transparent 25%), 
+                    linear-gradient(-45deg, #555 25%, transparent 25%), 
+                    linear-gradient(45deg, transparent 75%, #555 75%), 
+                    linear-gradient(-45deg, transparent 75%, #555 75%);
+                background-size: 8px 8px;
+                background-position: 0 0, 0 4px, 4px -4px, -4px 0px;
+                z-index: 1;
+            }
+
+            .layer-thumbnail canvas {
+                position: relative;
+                z-index: 2;
+            }
+
+            .layer-name {
+                flex: 1;
+                min-width: 0;
+                overflow: hidden;
+                text-overflow: ellipsis;
+                white-space: nowrap;
+                padding: 2px 4px;
+                border-radius: 2px;
+                color: #ffffff;
+            }
+
+            .layer-name.editing {
+                background: #4a4a4a;
+                border: 1px solid #6a6a6a;
+                outline: none;
+                color: #ffffff;
+            }
+
+            .layer-name input {
+                background: transparent;
+                border: none;
+                color: #ffffff;
+                font-size: 12px;
+                width: 100%;
+                outline: none;
+            }
+
+            .drag-insertion-line {
+                position: absolute;
+                left: 0;
+                right: 0;
+                height: 2px;
+                background: #4a7bc8;
+                border-radius: 1px;
+                z-index: 1000;
+                box-shadow: 0 0 4px rgba(74, 123, 200, 0.6);
+            }
+
+            .layers-container::-webkit-scrollbar {
+                width: 6px;
+            }
+
+            .layers-container::-webkit-scrollbar-track {
+                background: #2a2a2a;
+            }
+
+            .layers-container::-webkit-scrollbar-thumb {
+                background: #4a4a4a;
+                border-radius: 3px;
+            }
+
+            .layers-container::-webkit-scrollbar-thumb:hover {
+                background: #5a5a5a;
+            }
+        `;
+        
+        document.head.appendChild(style);
+        log.debug('Styles injected');
+    }
+
+    /**
+     * Konfiguruje event listenery dla przycisków kontrolnych
+     */
+    setupControlButtons() {
+        const deleteBtn = this.container.querySelector('#delete-layer-btn');
+
+        deleteBtn?.addEventListener('click', () => {
+            log.info('Delete layer button clicked');
+            this.deleteSelectedLayers();
+        });
+    }
+
+    /**
+     * Renderuje listę warstw
+     */
+    renderLayers() {
+        if (!this.layersContainer) {
+            log.warn('Layers container not initialized');
+            return;
+        }
+
+        // Wyczyść istniejącą zawartość
+        this.layersContainer.innerHTML = '';
+
+        // Usuń linię wstawiania jeśli istnieje
+        this.removeDragInsertionLine();
+
+        // Sortuj warstwy według zIndex (od najwyższej do najniższej)
+        const sortedLayers = [...this.canvas.layers].sort((a, b) => b.zIndex - a.zIndex);
+
+        sortedLayers.forEach((layer, index) => {
+            const layerElement = this.createLayerElement(layer, index);
+            this.layersContainer.appendChild(layerElement);
+        });
+
+        log.debug(`Rendered ${sortedLayers.length} layers`);
+    }
+
+    /**
+     * Tworzy element HTML dla pojedynczej warstwy
+     */
+    createLayerElement(layer, index) {
+        const layerRow = document.createElement('div');
+        layerRow.className = 'layer-row';
+        layerRow.draggable = true;
+        layerRow.dataset.layerIndex = index;
+        
+        // Sprawdź czy warstwa jest zaznaczona
+        const isSelected = this.canvas.selectedLayers.includes(layer);
+        if (isSelected) {
+            layerRow.classList.add('selected');
+        }
+
+        // Ustawienie domyślnych właściwości jeśli nie istnieją
+        if (!layer.name) {
+            layer.name = this.ensureUniqueName(`Layer ${layer.zIndex + 1}`, layer);
+        } else {
+            // Sprawdź unikalność istniejącej nazwy (np. przy duplikowaniu)
+            layer.name = this.ensureUniqueName(layer.name, layer);
+        }
+
+        layerRow.innerHTML = `
+            <div class="layer-thumbnail" data-layer-index="${index}"></div>
+            <span class="layer-name" data-layer-index="${index}">${layer.name}</span>
+        `;
+
+        // Wygeneruj miniaturkę
+        this.generateThumbnail(layer, layerRow.querySelector('.layer-thumbnail'));
+
+        // Event listenery
+        this.setupLayerEventListeners(layerRow, layer, index);
+
+        return layerRow;
+    }
+
+    /**
+     * Generuje miniaturkę warstwy
+     */
+    generateThumbnail(layer, thumbnailContainer) {
+        if (!layer.image) {
+            thumbnailContainer.style.background = '#4a4a4a';
+            return;
+        }
+
+        const canvas = document.createElement('canvas');
+        const ctx = canvas.getContext('2d', { willReadFrequently: true });
+        canvas.width = 48;
+        canvas.height = 48;
+
+        // Oblicz skalę zachowując proporcje
+        const scale = Math.min(48 / layer.image.width, 48 / layer.image.height);
+        const scaledWidth = layer.image.width * scale;
+        const scaledHeight = layer.image.height * scale;
+        
+        // Wycentruj obraz
+        const x = (48 - scaledWidth) / 2;
+        const y = (48 - scaledHeight) / 2;
+
+        // Narysuj obraz z wyższą jakością
+        ctx.imageSmoothingEnabled = true;
+        ctx.imageSmoothingQuality = 'high';
+        ctx.drawImage(layer.image, x, y, scaledWidth, scaledHeight);
+
+        thumbnailContainer.appendChild(canvas);
+    }
+
+    /**
+     * Konfiguruje event listenery dla elementu warstwy
+     */
+    setupLayerEventListeners(layerRow, layer, index) {
+        // Mousedown handler - zaznaczanie w momencie wciśnięcia przycisku
+        layerRow.addEventListener('mousedown', (e) => {
+            // Ignoruj, jeśli edytujemy nazwę
+            const nameElement = layerRow.querySelector('.layer-name');
+            if (nameElement && nameElement.classList.contains('editing')) {
+                return;
+            }
+            this.handleLayerClick(e, layer, index);
+        });
+
+        // Double click handler - edycja nazwy
+        layerRow.addEventListener('dblclick', (e) => {
+            e.preventDefault();
+            e.stopPropagation();
+            const nameElement = layerRow.querySelector('.layer-name');
+            this.startEditingLayerName(nameElement, layer);
+        });
+
+        // Drag handlers
+        layerRow.addEventListener('dragstart', (e) => this.handleDragStart(e, layer, index));
+        layerRow.addEventListener('dragover', this.handleDragOver);
+        layerRow.addEventListener('dragend', this.handleDragEnd);
+        layerRow.addEventListener('drop', (e) => this.handleDrop(e, index));
+    }
+
+    /**
+     * Obsługuje kliknięcie na warstwę, aktualizując stan bez pełnego renderowania.
+     */
+    handleLayerClick(e, layer, index) {
+        const isCtrlPressed = e.ctrlKey || e.metaKey;
+        const isShiftPressed = e.shiftKey;
+
+        // Aktualizuj wewnętrzny stan zaznaczenia w obiekcie canvas
+        // Ta funkcja NIE powinna już wywoływać onSelectionChanged w panelu.
+        this.canvas.updateSelectionLogic(layer, isCtrlPressed, isShiftPressed, index);
+        
+        // Aktualizuj tylko wygląd (klasy CSS), bez niszczenia DOM
+        this.updateSelectionAppearance(); 
+
+        log.debug(`Layer clicked: ${layer.name}, selection count: ${this.canvas.selectedLayers.length}`);
+    }
+
+
+    /**
+     * Rozpoczyna edycję nazwy warstwy
+     */
+    startEditingLayerName(nameElement, layer) {
+        const currentName = layer.name;
+        nameElement.classList.add('editing');
+        
+        const input = document.createElement('input');
+        input.type = 'text';
+        input.value = currentName;
+        input.style.width = '100%';
+        
+        nameElement.innerHTML = '';
+        nameElement.appendChild(input);
+        
+        input.focus();
+        input.select();
+
+        const finishEditing = () => {
+            let newName = input.value.trim() || `Layer ${layer.zIndex + 1}`;
+            newName = this.ensureUniqueName(newName, layer);
+            layer.name = newName;
+            nameElement.classList.remove('editing');
+            nameElement.textContent = newName;
+            
+            this.canvas.saveState();
+            log.info(`Layer renamed to: ${newName}`);
+        };
+
+        input.addEventListener('blur', finishEditing);
+        input.addEventListener('keydown', (e) => {
+            if (e.key === 'Enter') {
+                finishEditing();
+            } else if (e.key === 'Escape') {
+                nameElement.classList.remove('editing');
+                nameElement.textContent = currentName;
+            }
+        });
+    }
+
+
+    /**
+     * Zapewnia unikalność nazwy warstwy
+     */
+    ensureUniqueName(proposedName, currentLayer) {
+        const existingNames = this.canvas.layers
+            .filter(layer => layer !== currentLayer)
+            .map(layer => layer.name);
+        
+        if (!existingNames.includes(proposedName)) {
+            return proposedName;
+        }
+        
+        // Sprawdź czy nazwa już ma numerację w nawiasach
+        const match = proposedName.match(/^(.+?)\s*\((\d+)\)$/);
+        let baseName, startNumber;
+        
+        if (match) {
+            baseName = match[1].trim();
+            startNumber = parseInt(match[2]) + 1;
+        } else {
+            baseName = proposedName;
+            startNumber = 1;
+        }
+        
+        // Znajdź pierwszą dostępną numerację
+        let counter = startNumber;
+        let uniqueName;
+        
+        do {
+            uniqueName = `${baseName} (${counter})`;
+            counter++;
+        } while (existingNames.includes(uniqueName));
+        
+        return uniqueName;
+    }
+
+    /**
+     * Usuwa zaznaczone warstwy
+     */
+    deleteSelectedLayers() {
+        if (this.canvas.selectedLayers.length === 0) {
+            log.debug('No layers selected for deletion');
+            return;
+        }
+
+        log.info(`Deleting ${this.canvas.selectedLayers.length} selected layers`);
+        this.canvas.removeSelectedLayers();
+        this.renderLayers();
+    }
+
+    /**
+     * Rozpoczyna przeciąganie warstwy
+     */
+    handleDragStart(e, layer, index) {
+        // Sprawdź czy jakakolwiek warstwa jest w trybie edycji
+        const editingElement = this.layersContainer.querySelector('.layer-name.editing');
+        if (editingElement) {
+            e.preventDefault();
+            return;
+        }
+
+        // Jeśli przeciągana warstwa nie jest zaznaczona, zaznacz ją
+        if (!this.canvas.selectedLayers.includes(layer)) {
+            this.canvas.updateSelection([layer]);
+            this.renderLayers();
+        }
+
+        this.draggedElements = [...this.canvas.selectedLayers];
+        e.dataTransfer.effectAllowed = 'move';
+        e.dataTransfer.setData('text/plain', ''); // Wymagane przez standard
+
+        // Dodaj klasę dragging do przeciąganych elementów
+        this.layersContainer.querySelectorAll('.layer-row').forEach((row, idx) => {
+            const sortedLayers = [...this.canvas.layers].sort((a, b) => b.zIndex - a.zIndex);
+            if (this.draggedElements.includes(sortedLayers[idx])) {
+                row.classList.add('dragging');
+            }
+        });
+
+        log.debug(`Started dragging ${this.draggedElements.length} layers`);
+    }
+
+    /**
+     * Obsługuje przeciąganie nad warstwą
+     */
+    handleDragOver(e) {
+        e.preventDefault();
+        e.dataTransfer.dropEffect = 'move';
+
+        const layerRow = e.currentTarget;
+        const rect = layerRow.getBoundingClientRect();
+        const midpoint = rect.top + rect.height / 2;
+        const isUpperHalf = e.clientY < midpoint;
+
+        this.showDragInsertionLine(layerRow, isUpperHalf);
+    }
+
+    /**
+     * Pokazuje linię wskaźnika wstawiania
+     */
+    showDragInsertionLine(targetRow, isUpperHalf) {
+        this.removeDragInsertionLine();
+
+        const line = document.createElement('div');
+        line.className = 'drag-insertion-line';
+        
+        if (isUpperHalf) {
+            line.style.top = '-1px';
+        } else {
+            line.style.bottom = '-1px';
+        }
+
+        targetRow.style.position = 'relative';
+        targetRow.appendChild(line);
+        this.dragInsertionLine = line;
+    }
+
+    /**
+     * Usuwa linię wskaźnika wstawiania
+     */
+    removeDragInsertionLine() {
+        if (this.dragInsertionLine) {
+            this.dragInsertionLine.remove();
+            this.dragInsertionLine = null;
+        }
+    }
+
+    /**
+     * Obsługuje upuszczenie warstwy
+     */
+    handleDrop(e, targetIndex) {
+        e.preventDefault();
+        this.removeDragInsertionLine();
+
+        if (this.draggedElements.length === 0) return;
+
+        const rect = e.currentTarget.getBoundingClientRect();
+        const midpoint = rect.top + rect.height / 2;
+        const isUpperHalf = e.clientY < midpoint;
+        
+        // Oblicz docelowy indeks
+        let insertIndex = targetIndex;
+        if (!isUpperHalf) {
+            insertIndex = targetIndex + 1;
+        }
+
+        // Użyj nowej, centralnej funkcji do przesuwania warstw
+        this.canvas.canvasLayers.moveLayers(this.draggedElements, { toIndex: insertIndex });
+        
+        log.info(`Dropped ${this.draggedElements.length} layers at position ${insertIndex}`);
+    }
+
+    /**
+     * Kończy przeciąganie
+     */
+    handleDragEnd(e) {
+        this.removeDragInsertionLine();
+        
+        // Usuń klasę dragging ze wszystkich elementów
+        this.layersContainer.querySelectorAll('.layer-row').forEach(row => {
+            row.classList.remove('dragging');
+        });
+
+        this.draggedElements = [];
+    }
+
+
+    /**
+     * Aktualizuje panel gdy zmienią się warstwy
+     */
+    onLayersChanged() {
+        this.renderLayers();
+    }
+
+    /**
+     * Aktualizuje wygląd zaznaczenia w panelu bez pełnego renderowania.
+     */
+    updateSelectionAppearance() {
+        const sortedLayers = [...this.canvas.layers].sort((a, b) => b.zIndex - a.zIndex);
+        const layerRows = this.layersContainer.querySelectorAll('.layer-row');
+
+        layerRows.forEach((row, index) => {
+            const layer = sortedLayers[index];
+            if (this.canvas.selectedLayers.includes(layer)) {
+                row.classList.add('selected');
+            } else {
+                row.classList.remove('selected');
+            }
+        });
+    }
+
+    /**
+     * Aktualizuje panel gdy zmienią się warstwy (np. dodanie, usunięcie, zmiana kolejności)
+     * To jest jedyne miejsce, gdzie powinniśmy w pełni renderować panel.
+     */
+    onLayersChanged() {
+        this.renderLayers();
+    }
+
+    /**
+     * Aktualizuje panel gdy zmieni się zaznaczenie (wywoływane z zewnątrz).
+     * Zamiast pełnego renderowania, tylko aktualizujemy wygląd.
+     */
+    onSelectionChanged() {
+        this.updateSelectionAppearance();
+    }
+
+    /**
+     * Niszczy panel i czyści event listenery
+     */
+    destroy() {
+        if (this.container && this.container.parentNode) {
+            this.container.parentNode.removeChild(this.container);
+        }
+        this.container = null;
+        this.layersContainer = null;
+        this.draggedElements = [];
+        this.removeDragInsertionLine();
+        
+        log.info('CanvasLayersPanel destroyed');
+    }
+}

js/CanvasState.js

@@ -16,6 +16,25 @@ export class CanvasState {
         this.saveTimeout = null;
         this.lastSavedStateSignature = null;
         this._loadInProgress = null;
+
+        // Inicjalizacja Web Workera w sposób odporny na problemy ze ścieżkami
+        try {
+            // new URL(..., import.meta.url) tworzy absolutną ścieżkę do workera
+            this.stateSaverWorker = new Worker(new URL('./state-saver.worker.js', import.meta.url), { type: 'module' });
+            log.info("State saver worker initialized successfully.");
+            
+            this.stateSaverWorker.onmessage = (e) => {
+                log.info("Message from state saver worker:", e.data);
+            };
+            this.stateSaverWorker.onerror = (e) => {
+                log.error("Error in state saver worker:", e.message, e.filename, e.lineno);
+                // Zapobiegaj dalszym próbom, jeśli worker nie działa
+                this.stateSaverWorker = null; 
+            };
+        } catch (e) {
+            log.error("Failed to initialize state saver worker:", e);
+            this.stateSaverWorker = null;
+        }
     }
 
 
@@ -182,47 +201,35 @@ export class CanvasState {
         img.src = imageSrc;
     }
 
-    async saveStateToDB(immediate = false) {
-        log.info("Preparing to save state to IndexedDB for node:", this.canvas.node.id);
+    async saveStateToDB() {
         if (!this.canvas.node.id) {
             log.error("Node ID is not available for saving state to DB.");
             return;
         }
 
-        const currentStateSignature = getStateSignature(this.canvas.layers);
-        if (this.lastSavedStateSignature === currentStateSignature) {
-            log.debug("State unchanged, skipping save to IndexedDB.");
+        log.info("Preparing state to be sent to worker...");
+        const state = {
+            layers: await this._prepareLayers(),
+            viewport: this.canvas.viewport,
+            width: this.canvas.width,
+            height: this.canvas.height,
+        };
+
+        state.layers = state.layers.filter(layer => layer !== null);
+        if (state.layers.length === 0) {
+            log.warn("No valid layers to save, skipping.");
             return;
         }
 
-        if (this.saveTimeout) {
-            clearTimeout(this.saveTimeout);
-        }
-
-        const saveFunction = withErrorHandling(async () => {
-            const state = {
-                layers: await this._prepareLayers(),
-                viewport: this.canvas.viewport,
-                width: this.canvas.width,
-                height: this.canvas.height,
-            };
-
-            state.layers = state.layers.filter(layer => layer !== null);
-            if (state.layers.length === 0) {
-                log.warn("No valid layers to save, skipping save to IndexedDB.");
-                return;
-            }
-
-            await setCanvasState(this.canvas.node.id, state);
-            log.info("Canvas state saved to IndexedDB.");
-            this.lastSavedStateSignature = currentStateSignature;
-            this.canvas.render();
-        }, 'CanvasState.saveStateToDB');
-
-        if (immediate) {
-            await saveFunction();
+        if (this.stateSaverWorker) {
+            log.info("Posting state to worker for background saving.");
+            this.stateSaverWorker.postMessage({
+                nodeId: this.canvas.node.id,
+                state: state
+            });
         } else {
-            this.saveTimeout = setTimeout(saveFunction, 1000);
+            log.warn("State saver worker not available. Saving on main thread.");
+            await setCanvasState(this.canvas.node.id, state);
         }
     }
 
@@ -264,14 +271,15 @@ export class CanvasState {
         }
 
         const currentState = cloneLayers(this.canvas.layers);
+        const currentStateSignature = getStateSignature(currentState);
 
         if (this.layersUndoStack.length > 0) {
             const lastState = this.layersUndoStack[this.layersUndoStack.length - 1];
-            if (getStateSignature(currentState) === getStateSignature(lastState)) {
-                return;
+            if (getStateSignature(lastState) === currentStateSignature) {
+                return; 
             }
         }
-
+        
         this.layersUndoStack.push(currentState);
 
         if (this.layersUndoStack.length > this.historyLimit) {
@@ -279,7 +287,11 @@ export class CanvasState {
         }
         this.layersRedoStack = [];
         this.canvas.updateHistoryButtons();
-        this._debouncedSave = this._debouncedSave || debounce(() => this.saveStateToDB(), 500);
+        
+        // Użyj debouncingu, aby zapobiec zbyt częstym zapisom
+        if (!this._debouncedSave) {
+            this._debouncedSave = debounce(() => this.saveStateToDB(), 1000);
+        }
         this._debouncedSave();
     }
 

js/CanvasView.js

@@ -429,7 +429,7 @@ async function createCanvasWidget(node, widget, app) {
             <tr><td><kbd>Mouse Wheel</kbd></td><td>Zoom view in/out</td></tr>
             <tr><td><kbd>Shift + Click (background)</kbd></td><td>Start resizing canvas area</td></tr>
             <tr><td><kbd>Shift + Ctrl + Click</kbd></td><td>Start moving entire canvas</td></tr>
-            <tr><td><kbd>Double Click (background)</kbd></td><td>Deselect all layers</td></tr>
+            <tr><td><kbd>Single Click (background)</kbd></td><td>Deselect all layers</td></tr>
         </table>
 
         <h4>Clipboard & I/O</h4>
@@ -444,10 +444,11 @@ async function createCanvasWidget(node, widget, app) {
             <tr><td><kbd>Click + Drag</kbd></td><td>Move selected layer(s)</td></tr>
             <tr><td><kbd>Ctrl + Click</kbd></td><td>Add/Remove layer from selection</td></tr>
             <tr><td><kbd>Alt + Drag</kbd></td><td>Clone selected layer(s)</td></tr>
-            <tr><td><kbd>Shift + Click</kbd></td><td>Show blend mode & opacity menu</td></tr>
+            <tr><td><kbd>Right Click</kbd></td><td>Show blend mode & opacity menu</td></tr>
             <tr><td><kbd>Mouse Wheel</kbd></td><td>Scale layer (snaps to grid)</td></tr>
             <tr><td><kbd>Ctrl + Mouse Wheel</kbd></td><td>Fine-scale layer</td></tr>
-            <tr><td><kbd>Shift + Mouse Wheel</kbd></td><td>Rotate layer by 5°</td></tr>
+            <tr><td><kbd>Shift + Mouse Wheel</kbd></td><td>Rotate layer by 5° steps</td></tr>
+            <tr><td><kbd>Shift + Ctrl + Mouse Wheel</kbd></td><td>Snap rotation to 5° increments</td></tr>
             <tr><td><kbd>Arrow Keys</kbd></td><td>Nudge layer by 1px</td></tr>
             <tr><td><kbd>Shift + Arrow Keys</kbd></td><td>Nudge layer by 10px</td></tr>
             <tr><td><kbd>[</kbd> or <kbd>]</kbd></td><td>Rotate by 1°</td></tr>
@@ -477,6 +478,41 @@ async function createCanvasWidget(node, widget, app) {
     `;
 
     document.body.appendChild(helpTooltip);
+
+    // Helper function for tooltip positioning
+    const showTooltip = (buttonElement, content) => {
+        helpTooltip.innerHTML = content;
+        helpTooltip.style.visibility = 'hidden';
+        helpTooltip.style.display = 'block';
+
+        const buttonRect = buttonElement.getBoundingClientRect();
+        const tooltipRect = helpTooltip.getBoundingClientRect();
+        const viewportWidth = window.innerWidth;
+        const viewportHeight = window.innerHeight;
+
+        let left = buttonRect.left;
+        let top = buttonRect.bottom + 5;
+
+        if (left + tooltipRect.width > viewportWidth) {
+            left = viewportWidth - tooltipRect.width - 10;
+        }
+
+        if (top + tooltipRect.height > viewportHeight) {
+            top = buttonRect.top - tooltipRect.height - 5;
+        }
+
+        if (left < 10) left = 10;
+        if (top < 10) top = 10;
+
+        helpTooltip.style.left = `${left}px`;
+        helpTooltip.style.top = `${top}px`;
+        helpTooltip.style.visibility = 'visible';
+    };
+
+    const hideTooltip = () => {
+        helpTooltip.style.display = 'none';
+    };
+
     const controlPanel = $el("div.painterControlPanel", {}, [
         $el("div.controls.painter-controls", {
             style: {
@@ -508,43 +544,10 @@ async function createCanvasWidget(node, widget, app) {
                         fontWeight: "bold",
                     },
                     onmouseenter: (e) => {
-                        if (canvas.maskTool.isActive) {
-                            helpTooltip.innerHTML = maskShortcuts;
-                        } else {
-                            helpTooltip.innerHTML = standardShortcuts;
-                        }
-
-                        helpTooltip.style.visibility = 'hidden';
-                        helpTooltip.style.display = 'block';
-
-                        const buttonRect = e.target.getBoundingClientRect();
-                        const tooltipRect = helpTooltip.getBoundingClientRect();
-                        const viewportWidth = window.innerWidth;
-                        const viewportHeight = window.innerHeight;
-
-                        let left = buttonRect.left;
-                        let top = buttonRect.bottom + 5;
-
-                        if (left + tooltipRect.width > viewportWidth) {
-                            left = viewportWidth - tooltipRect.width - 10;
-                        }
-
-                        if (top + tooltipRect.height > viewportHeight) {
-
-                            top = buttonRect.top - tooltipRect.height - 5;
-                        }
-
-                        if (left < 10) left = 10;
-
-                        if (top < 10) top = 10;
-
-                        helpTooltip.style.left = `${left}px`;
-                        helpTooltip.style.top = `${top}px`;
-                        helpTooltip.style.visibility = 'visible';
+                        const content = canvas.maskTool.isActive ? maskShortcuts : standardShortcuts;
+                        showTooltip(e.target, content);
                     },
-                    onmouseleave: () => {
-                        helpTooltip.style.display = 'none';
-                    }
+                    onmouseleave: hideTooltip
                 }),
                 $el("button.painter-button.primary", {
                     textContent: "Add Image",
@@ -653,36 +656,9 @@ async function createCanvasWidget(node, widget, app) {
                                 `;
                             }
 
-                            helpTooltip.innerHTML = tooltipContent;
-                            helpTooltip.style.visibility = 'hidden';
-                            helpTooltip.style.display = 'block';
-
-                            const buttonRect = e.target.getBoundingClientRect();
-                            const tooltipRect = helpTooltip.getBoundingClientRect();
-                            const viewportWidth = window.innerWidth;
-                            const viewportHeight = window.innerHeight;
-
-                            let left = buttonRect.left;
-                            let top = buttonRect.bottom + 5;
-
-                            if (left + tooltipRect.width > viewportWidth) {
-                                left = viewportWidth - tooltipRect.width - 10;
-                            }
-
-                            if (top + tooltipRect.height > viewportHeight) {
-                                top = buttonRect.top - tooltipRect.height - 5;
-                            }
-
-                            if (left < 10) left = 10;
-                            if (top < 10) top = 10;
-
-                            helpTooltip.style.left = `${left}px`;
-                            helpTooltip.style.top = `${top}px`;
-                            helpTooltip.style.visibility = 'visible';
+                            showTooltip(e.target, tooltipContent);
                         },
-                        onmouseleave: () => {
-                            helpTooltip.style.display = 'none';
-                        }
+                        onmouseleave: hideTooltip
                     })
                 ]),
             ]),
@@ -789,6 +765,11 @@ async function createCanvasWidget(node, widget, app) {
                     title: "Move selected layer(s) down",
                     onclick: () => canvas.canvasLayers.moveLayerDown()
                 }),
+                $el("button.painter-button.requires-selection", {
+                    textContent: "Fuse",
+                    title: "Flatten and merge selected layers into a single layer",
+                    onclick: () => canvas.canvasLayers.fuseLayers()
+                }),
             ]),
 
             $el("div.painter-separator"),
@@ -845,9 +826,15 @@ async function createCanvasWidget(node, widget, app) {
                                 body: JSON.stringify({image: imageData})
                             });
 
-                            if (!response.ok) throw new Error(`Server error: ${response.status} - ${response.statusText}`);
-
                             const result = await response.json();
+
+                            if (!response.ok) {
+                                let errorMsg = `Server error: ${response.status} - ${response.statusText}`;
+                                if (result && result.error) {
+                                    errorMsg = `Error: ${result.error}\n\nDetails: ${result.details}`;
+                                }
+                                throw new Error(errorMsg);
+                            }
                             const mattedImage = new Image();
                             mattedImage.src = result.matted_image;
                             await mattedImage.decode();
@@ -859,7 +846,7 @@ async function createCanvasWidget(node, widget, app) {
                             canvas.saveState();
                         } catch (error) {
                             log.error("Matting error:", error);
-                            alert(`Error during matting process: ${error.message}`);
+                            alert(`Matting process failed:\n\n${error.message}`);
                         } finally {
                             button.classList.remove('loading');
                             button.removeChild(spinner);
@@ -871,14 +858,14 @@ async function createCanvasWidget(node, widget, app) {
                     textContent: "Undo",
                     title: "Undo last action",
                     disabled: true,
-                    onclick: () => canvas.canvasState.undo()
+                    onclick: () => canvas.undo()
                 }),
                 $el("button.painter-button", {
                     id: `redo-button-${node.id}`,
                     textContent: "Redo",
                     title: "Redo last undone action",
                     disabled: true,
-                    onclick: () => canvas.canvasState.redo()
+                    onclick: () => canvas.redo()
                 }),
             ]),
             $el("div.painter-separator"),
@@ -1008,7 +995,12 @@ async function createCanvasWidget(node, widget, app) {
         const selectionCount = canvas.selectedLayers.length;
         const hasSelection = selectionCount > 0;
         controlPanel.querySelectorAll('.requires-selection').forEach(btn => {
-            btn.disabled = !hasSelection;
+            // Special handling for Fuse button - requires at least 2 layers
+            if (btn.textContent === 'Fuse') {
+                btn.disabled = selectionCount < 2;
+            } else {
+                btn.disabled = !hasSelection;
+            }
         });
         const mattingBtn = controlPanel.querySelector('.matting-button');
         if (mattingBtn && !mattingBtn.classList.contains('loading')) {
@@ -1030,13 +1022,6 @@ async function createCanvasWidget(node, widget, app) {
     canvas.updateHistoryButtons();
 
 
-    const resizeObserver = new ResizeObserver((entries) => {
-        const controlsHeight = entries[0].target.offsetHeight;
-        canvasContainer.style.top = (controlsHeight + 10) + "px";
-    });
-
-    resizeObserver.observe(controlPanel.querySelector('.controls'));
-
     const triggerWidget = node.widgets.find(w => w.name === "trigger");
 
     const updateOutput = async () => {
@@ -1058,18 +1043,41 @@ async function createCanvasWidget(node, widget, app) {
 
     };
 
+    // Tworzenie panelu warstw
+    const layersPanel = canvas.canvasLayersPanel.createPanelStructure();
+
     const canvasContainer = $el("div.painterCanvasContainer.painter-container", {
         style: {
             position: "absolute",
-            top: "60px",
+            top: "60px", // Wartość początkowa, zostanie nadpisana przez ResizeObserver
             left: "10px",
-            right: "10px",
+            right: "270px",
             bottom: "10px",
-
             overflow: "hidden"
         }
     }, [canvas.canvas]);
 
+    // Kontener dla panelu warstw
+    const layersPanelContainer = $el("div.painterLayersPanelContainer", {
+        style: {
+            position: "absolute",
+            top: "60px", // Wartość początkowa, zostanie nadpisana przez ResizeObserver
+            right: "10px",
+            width: "250px",
+            bottom: "10px",
+            overflow: "hidden"
+        }
+    }, [layersPanel]);
+
+    const resizeObserver = new ResizeObserver((entries) => {
+        const controlsHeight = entries[0].target.offsetHeight;
+        const newTop = (controlsHeight + 10) + "px";
+        canvasContainer.style.top = newTop;
+        layersPanelContainer.style.top = newTop;
+    });
+
+    resizeObserver.observe(controlPanel.querySelector('.controls'));
+
     canvas.canvas.addEventListener('focus', () => {
         canvasContainer.classList.add('has-focus');
     });
@@ -1090,7 +1098,7 @@ async function createCanvasWidget(node, widget, app) {
             width: "100%",
             height: "100%"
         }
-    }, [controlPanel, canvasContainer]);
+    }, [controlPanel, canvasContainer, layersPanelContainer]);
 
 
 
@@ -1157,6 +1165,10 @@ async function createCanvasWidget(node, widget, app) {
 
     setTimeout(() => {
         canvas.loadInitialState();
+        // Renderuj panel warstw po załadowaniu stanu
+        if (canvas.canvasLayersPanel) {
+            canvas.canvasLayersPanel.renderLayers();
+        }
     }, 100);
 
     const showPreviewWidget = node.widgets.find(w => w.name === "show_preview");

js/state-saver.worker.js

@@ -0,0 +1,93 @@
+console.log('[StateWorker] Worker script loaded and running.');
+
+const DB_NAME = 'CanvasNodeDB';
+const STATE_STORE_NAME = 'CanvasState';
+const DB_VERSION = 3;
+
+let db;
+
+function log(...args) {
+    console.log('[StateWorker]', ...args);
+}
+
+function error(...args) {
+    console.error('[StateWorker]', ...args);
+}
+
+function createDBRequest(store, operation, data, errorMessage) {
+    return new Promise((resolve, reject) => {
+        let request;
+        switch (operation) {
+            case 'put':
+                request = store.put(data);
+                break;
+            default:
+                reject(new Error(`Unknown operation: ${operation}`));
+                return;
+        }
+
+        request.onerror = (event) => {
+            error(errorMessage, event.target.error);
+            reject(errorMessage);
+        };
+
+        request.onsuccess = (event) => {
+            resolve(event.target.result);
+        };
+    });
+}
+
+function openDB() {
+    return new Promise((resolve, reject) => {
+        if (db) {
+            resolve(db);
+            return;
+        }
+
+        const request = indexedDB.open(DB_NAME, DB_VERSION);
+
+        request.onerror = (event) => {
+            error("IndexedDB error:", event.target.error);
+            reject("Error opening IndexedDB.");
+        };
+
+        request.onsuccess = (event) => {
+            db = event.target.result;
+            log("IndexedDB opened successfully in worker.");
+            resolve(db);
+        };
+
+        request.onupgradeneeded = (event) => {
+            log("Upgrading IndexedDB in worker...");
+            const tempDb = event.target.result;
+            if (!tempDb.objectStoreNames.contains(STATE_STORE_NAME)) {
+                tempDb.createObjectStore(STATE_STORE_NAME, {keyPath: 'id'});
+            }
+        };
+    });
+}
+
+async function setCanvasState(id, state) {
+    const db = await openDB();
+    const transaction = db.transaction([STATE_STORE_NAME], 'readwrite');
+    const store = transaction.objectStore(STATE_STORE_NAME);
+    await createDBRequest(store, 'put', {id, state}, "Error setting canvas state");
+}
+
+self.onmessage = async function(e) {
+    log('Message received from main thread:', e.data ? 'data received' : 'no data');
+    const { state, nodeId } = e.data;
+
+    if (!state || !nodeId) {
+        error('Invalid data received from main thread');
+        return;
+    }
+
+    try {
+        log(`Saving state for node: ${nodeId}`);
+        await setCanvasState(nodeId, state);
+        log(`State saved successfully for node: ${nodeId}`);
+    } catch (err) {
+        error(`Failed to save state for node: ${nodeId}`, err);
+    }
+};

js/utils/LoggerUtils.js

@@ -11,7 +11,7 @@ import {logger, LogLevel} from "../logger.js";
  * @param {LogLevel} level - Poziom logowania (domyślnie DEBUG)
  * @returns {Object} Obiekt z metodami logowania
  */
-export function createModuleLogger(moduleName, level = LogLevel.NONE) {
+export function createModuleLogger(moduleName, level = LogLevel.DEBUG) {
     logger.setModuleLevel(moduleName, level);
 
     return {

pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "layerforge"
 description = "Photoshop-like layered canvas editor to your ComfyUI workflow. This node is perfect for complex compositing, inpainting, and outpainting, featuring multi-layer support, masking, blend modes, and precise transformations. Includes optional AI-powered background removal for streamlined image editing."
-version = "1.3.1"
+version = "1.3.3"
 license = {file = "LICENSE"}
 dependencies = ["torch", "torchvision", "transformers", "aiohttp", "numpy", "tqdm", "Pillow"]