initial public release.

src/util/copyPasteUtil.ts

@@ -0,0 +1,83 @@
+import { KGCore } from '../core/KGCore';
+import { useProjectStore } from '../stores/projectStore';
+
+/**
+ * Utility functions for copy/paste operations
+ * Extracted from useGlobalKeyboardHandler for reuse in toolbar buttons
+ */
+
+/**
+ * Handles copy operation for currently selected items
+ * @returns {boolean} true if items were copied, false if no items were selected
+ */
+export const handleCopyOperation = (): boolean => {
+  const core = KGCore.instance();
+  const selectedItems = core.getSelectedItems();
+  
+  if (selectedItems.length > 0) {
+    core.copySelectedItems();
+    console.log(`Copied ${selectedItems.length} items to clipboard`);
+    return true;
+  }
+  
+  console.log('No items selected to copy');
+  return false;
+};
+
+/**
+ * Handles paste operation based on current context
+ * @returns {boolean} true if items were pasted, false if paste was not possible
+ */
+export const handlePasteOperation = (): boolean => {
+  const core = KGCore.instance();
+  const copiedItems = core.getCopiedItems();
+  
+  if (copiedItems.length === 0) {
+    console.log('No items in clipboard to paste');
+    return false;
+  }
+
+  // Get current store state
+  const { 
+    selectedTrackId, 
+    showPianoRoll, 
+    activeRegionId,
+    pasteRegionsAtTrack,
+    pasteNotesToActiveRegion 
+  } = useProjectStore.getState();
+
+  // Determine paste context and handle accordingly
+  const hasRegions = copiedItems.some(item => item.getRootType() === 'KGRegion');
+  const hasNotes = copiedItems.some(item => item.getRootType() === 'KGMidiNote');
+
+  if (hasRegions && !hasNotes) {
+    // Pasting regions - need selected track and playhead position
+    if (selectedTrackId) {
+      const playheadPosition = core.getPlayheadPosition();
+      pasteRegionsAtTrack(selectedTrackId, playheadPosition);
+      console.log(`Pasted ${copiedItems.length} regions at track ${selectedTrackId}, position ${playheadPosition}`);
+      return true;
+    } else {
+      console.log('No track selected for pasting regions');
+      return false;
+    }
+  } else if (hasNotes && !hasRegions) {
+    // Pasting notes - only when piano roll is open
+    if (showPianoRoll && activeRegionId) {
+      // Use the active region's playhead position (could be different from global playhead)
+      // For now, we'll use global playhead - this can be refined later
+      const playheadPosition = core.getPlayheadPosition();
+      pasteNotesToActiveRegion(activeRegionId, playheadPosition);
+      console.log(`Pasted ${copiedItems.length} notes to active region ${activeRegionId}, position ${playheadPosition}`);
+      return true;
+    } else {
+      console.log('Piano roll must be open to paste notes');
+      return false;
+    }
+  } else if (hasRegions && hasNotes) {
+    console.log('Mixed clipboard content (regions + notes) cannot be pasted');
+    return false;
+  }
+
+  return false;
+};