feat: misc behavior changes

src/components/event-list-panel/RegionEventListTab.tsx

@@ -843,7 +843,9 @@ const RegionEventListTab: React.FC<RegionEventListTabProps> = ({ activeMidiRegio
         ? lastSelectedNote.getEndBeat() - lastSelectedNote.getStartBeat()
         : KGPianoRollState.instance().getLastEditedNoteLength();
       const defaultPitch = lastSelectedNote ? lastSelectedNote.getPitch() : noteNameToPitch('C4');
-      const defaultVelocity = lastSelectedNote ? lastSelectedNote.getVelocity() : 127;
+      const defaultVelocity = lastSelectedNote
+        ? lastSelectedNote.getVelocity()
+        : KGPianoRollState.instance().getLastEditedNoteVelocity();
 
       const command = new CreateNoteCommand(
         activeMidiRegion.getId(),
@@ -855,6 +857,7 @@ const RegionEventListTab: React.FC<RegionEventListTabProps> = ({ activeMidiRegio
 
       KGCore.instance().executeCommand(command);
       KGPianoRollState.instance().setLastEditedNoteLength(defaultLength);
+      KGPianoRollState.instance().setLastEditedNoteVelocity(defaultVelocity);
       const createdNote = command.getCreatedNote();
       if (createdNote) {
         createdNote.select();

src/core/state/KGPianoRollState.ts

@@ -55,6 +55,7 @@ export class KGPianoRollState {
   private activeTool: string = "pointer";
   private currentSnap: PianoRollSnapValue = PIANO_ROLL_NO_SNAP;
   private lastEditedNoteLength: number = 1; // Default to 1 beat
+  private lastEditedNoteVelocity: number = 127;
   private currentMode: string = "ionian"; // Default mode
   private automationViewEnabled: boolean = false;
   private currentAutomationType: string = "pitch-bend";
@@ -108,6 +109,14 @@ export class KGPianoRollState {
     this.lastEditedNoteLength = length;
   }
 
+  public getLastEditedNoteVelocity(): number {
+    return this.lastEditedNoteVelocity;
+  }
+
+  public setLastEditedNoteVelocity(velocity: number): void {
+    this.lastEditedNoteVelocity = velocity;
+  }
+
   public getCurrentMode(): string {
     return this.currentMode;
   }

src/hooks/useNoteOperations.test.ts

@@ -59,10 +59,22 @@ vi.mock('../stores/projectStore', () => ({
   }),
 }));
 
+vi.mock('../core/audio-interface/KGAudioInterface', () => ({
+  KGAudioInterface: {
+    instance: () => ({
+      getIsInitialized: () => false,
+      getIsAudioContextStarted: () => false,
+      startAudioContext: vi.fn(),
+      triggerNote: vi.fn(),
+    }),
+  },
+}));
+
 import { useNoteOperations } from './useNoteOperations';
 import { KGCore } from '../core/KGCore';
 import { KGPianoRollState } from '../core/state/KGPianoRollState';
-import { MoveNotesCommand, ResizeNotesCommand } from '../core/commands';
+import { CreateNoteCommand, MoveNotesCommand, ResizeNotesCommand } from '../core/commands';
+import { CreateNotesCommand } from '../core/commands/note/CreateNotesCommand';
 import { useProjectStore } from '../stores/projectStore';
 import { createMockMidiNote, createMockMidiRegion, createMockMidiTrack } from '../test/utils/mock-data';
 
@@ -91,20 +103,157 @@ describe('useNoteOperations', () => {
 
     KGPianoRollState.instance().setActiveTool('pointer');
     KGPianoRollState.instance().setCurrentSnap('1/4');
+    KGPianoRollState.instance().setLastEditedNoteLength(1);
+    KGPianoRollState.instance().setLastEditedNoteVelocity(127);
+    KGPianoRollState.instance().setCurrentMatchingChords([]);
+    KGPianoRollState.instance().setCurrentSelectedChordIndex(0);
+    KGPianoRollState.instance().setCurrentChordCursorPitch(null);
   });
 
-  const renderNoteOperations = (activeRegion: ReturnType<typeof createMockMidiRegion>, track = createMockMidiTrack({ id: 1, regions: [activeRegion] }), updateTrack = vi.fn()) => {
+  const createPianoGridRef = () => ({
+    current: {
+      getBoundingClientRect: () => ({
+        left: 0,
+        top: 0,
+        right: 800,
+        bottom: 600,
+        width: 800,
+        height: 600,
+        x: 0,
+        y: 0,
+        toJSON: () => ({}),
+      }),
+    } as HTMLDivElement,
+  });
+
+  const createGridClickEvent = (overrides: Partial<React.MouseEvent> = {}): React.MouseEvent => ({
+    clientX: 80,
+    clientY: 120,
+    ctrlKey: false,
+    metaKey: false,
+    shiftKey: false,
+    altKey: false,
+    ...overrides,
+  } as React.MouseEvent);
+
+  const renderNoteOperations = (
+    activeRegion: ReturnType<typeof createMockMidiRegion>,
+    track = createMockMidiTrack({ id: 1, regions: [activeRegion] }),
+    updateTrack = vi.fn(),
+    pianoGridRef = createPianoGridRef(),
+  ) => {
     const hook = renderHook(() => useNoteOperations({
       activeRegion,
       timeSignature: { numerator: 4, denominator: 4 },
       updateTrack,
       tracks: [track],
-      pianoGridRef: { current: null },
+      pianoGridRef,
     }));
 
-    return { ...hook, track, updateTrack };
+    return { ...hook, track, updateTrack, pianoGridRef };
   };
 
+  it('uses the last selected note velocity when creating after deselecting', () => {
+    const selectedNote = createMockMidiNote({ id: 'note-a', velocity: 91, pitch: 60 });
+    const activeRegion = createMockMidiRegion({
+      id: 'region-1',
+      trackId: '1',
+      notes: [selectedNote],
+    });
+
+    selectedNote.select();
+    KGCore.instance().addSelectedItem(selectedNote);
+    KGPianoRollState.instance().setLastEditedNoteVelocity(selectedNote.getVelocity());
+    KGCore.instance().clearSelectedItems();
+
+    const { result } = renderNoteOperations(activeRegion);
+
+    act(() => {
+      result.current.handleGridDoubleClick(createGridClickEvent());
+    });
+
+    expect(coreState.executeCommand).toHaveBeenCalledTimes(1);
+    const createCommand = coreState.executeCommand.mock.calls[0][0] as CreateNoteCommand & { velocity: number };
+    expect(createCommand).toBeInstanceOf(CreateNoteCommand);
+    expect(createCommand.velocity).toBe(91);
+  });
+
+  it('uses the most recently selected note velocity after deselecting a multi-selection', () => {
+    const noteA = createMockMidiNote({ id: 'note-a', velocity: 40, pitch: 60 });
+    const noteB = createMockMidiNote({ id: 'note-b', velocity: 105, pitch: 64 });
+    const activeRegion = createMockMidiRegion({
+      id: 'region-1',
+      trackId: '1',
+      notes: [noteA, noteB],
+    });
+
+    noteA.select();
+    noteB.select();
+    KGCore.instance().addSelectedItem(noteA);
+    KGCore.instance().addSelectedItem(noteB);
+    KGPianoRollState.instance().setLastEditedNoteVelocity(noteB.getVelocity());
+    KGCore.instance().clearSelectedItems();
+
+    const { result } = renderNoteOperations(activeRegion);
+
+    act(() => {
+      result.current.handleGridDoubleClick(createGridClickEvent());
+    });
+
+    expect(coreState.executeCommand).toHaveBeenCalledTimes(1);
+    const createCommand = coreState.executeCommand.mock.calls[0][0] as CreateNoteCommand & { velocity: number };
+    expect(createCommand).toBeInstanceOf(CreateNoteCommand);
+    expect(createCommand.velocity).toBe(105);
+  });
+
+  it('falls back to velocity 127 when creating a manual note with no selection', () => {
+    const activeRegion = createMockMidiRegion({
+      id: 'region-1',
+      trackId: '1',
+      notes: [],
+    });
+
+    const { result } = renderNoteOperations(activeRegion);
+
+    act(() => {
+      result.current.handleGridDoubleClick(createGridClickEvent());
+    });
+
+    expect(coreState.executeCommand).toHaveBeenCalledTimes(1);
+    const createCommand = coreState.executeCommand.mock.calls[0][0] as CreateNoteCommand & { velocity: number };
+    expect(createCommand).toBeInstanceOf(CreateNoteCommand);
+    expect(createCommand.velocity).toBe(127);
+  });
+
+  it('applies the cached velocity to every note in manual chord creation after deselecting', () => {
+    const selectedNote = createMockMidiNote({ id: 'note-a', velocity: 73, pitch: 60 });
+    const activeRegion = createMockMidiRegion({
+      id: 'region-1',
+      trackId: '1',
+      notes: [selectedNote],
+    });
+
+    selectedNote.select();
+    KGCore.instance().addSelectedItem(selectedNote);
+    KGPianoRollState.instance().setLastEditedNoteVelocity(selectedNote.getVelocity());
+    KGCore.instance().clearSelectedItems();
+    KGPianoRollState.instance().setCurrentMatchingChords([[0, 4, 7]]);
+    KGPianoRollState.instance().setCurrentSelectedChordIndex(0);
+    KGPianoRollState.instance().setCurrentChordCursorPitch(72);
+
+    const { result } = renderNoteOperations(activeRegion);
+
+    act(() => {
+      result.current.handleGridDoubleClick(createGridClickEvent({ clientY: 706 }));
+    });
+
+    expect(coreState.executeCommand).toHaveBeenCalledTimes(1);
+    const createCommand = coreState.executeCommand.mock.calls[0][0] as CreateNotesCommand;
+    expect(createCommand).toBeInstanceOf(CreateNotesCommand);
+    expect(createCommand.getNoteCreationData()).toHaveLength(3);
+    expect(createCommand.getNoteCreationData().every(note => note.velocity === 73)).toBe(true);
+  });
+
   it('selects the grabbed note before resizing when it was not part of the current selection', () => {
     const noteA = createMockMidiNote({ id: 'note-a', startBeat: 0, endBeat: 1, pitch: 60 });
     const noteB = createMockMidiNote({ id: 'note-b', startBeat: 1, endBeat: 2, pitch: 62 });

src/hooks/useNoteOperations.ts

@@ -192,10 +192,10 @@ export const useNoteOperations = ({
     // Calculate note timing relative to the region
     const regionStartBeat = activeRegion.getStartFromBeat();
     const noteStartBeat = beatNumber - regionStartBeat; // relative beat position
-    const lastEditedLength = KGPianoRollState.instance().getLastEditedNoteLength();
-    const noteEndBeat = noteStartBeat + lastEditedLength; // Use last edited note length
-    const velocity = 127; // Maximum velocity
     const pianoRollState = KGPianoRollState.instance();
+    const lastEditedLength = pianoRollState.getLastEditedNoteLength();
+    const noteEndBeat = noteStartBeat + lastEditedLength; // Use last edited note length
+    const velocity = pianoRollState.getLastEditedNoteVelocity();
     const matchingChordPitches = pianoRollState.getCurrentMatchingChords();
     const selectedChordIndex = pianoRollState.getCurrentSelectedChordIndex();
     const cursorChordPitch = pianoRollState.getCurrentChordCursorPitch();
@@ -333,6 +333,7 @@ export const useNoteOperations = ({
       note.select();
       core.addSelectedItem(note);
       KGPianoRollState.instance().setLastEditedNoteLength(note.getEndBeat() - note.getStartBeat());
+      KGPianoRollState.instance().setLastEditedNoteVelocity(note.getVelocity());
 
       const track = tracks.find(t => t.getId().toString() === activeRegion.getTrackId());
       if (track) {

src/hooks/useNoteSelection.ts

@@ -108,6 +108,7 @@ export const useNoteSelection = ({
         // Update last edited note length
         const noteLength = note.getEndBeat() - note.getStartBeat();
         KGPianoRollState.instance().setLastEditedNoteLength(noteLength);
+        KGPianoRollState.instance().setLastEditedNoteVelocity(note.getVelocity());
         
         if (DEBUG_MODE.PIANO_ROLL) {
           console.log(`Added note to selection: ${noteId}`);
@@ -139,6 +140,7 @@ export const useNoteSelection = ({
       // Update last edited note length
       const noteLength = note.getEndBeat() - note.getStartBeat();
       KGPianoRollState.instance().setLastEditedNoteLength(noteLength);
+      KGPianoRollState.instance().setLastEditedNoteVelocity(note.getVelocity());
       
       if (DEBUG_MODE.PIANO_ROLL) {
         console.log(`Selected note (replacing previous selection): ${noteId}`);
@@ -416,6 +418,7 @@ export const useNoteSelection = ({
         
         const noteLength = closestNote.getEndBeat() - closestNote.getStartBeat();
         KGPianoRollState.instance().setLastEditedNoteLength(noteLength);
+        KGPianoRollState.instance().setLastEditedNoteVelocity(closestNote.getVelocity());
         
         if (DEBUG_MODE.PIANO_ROLL) {
           console.log(`Updated last edited note length to ${noteLength} from closest note: ${closestNote.getId()}`);

src/stores/projectStore.test.ts

@@ -4,6 +4,8 @@ import { KGTrack } from '../core/track/KGTrack';
 import { KGMidiTrack } from '../core/track/KGMidiTrack';
 import { KGAudioTrack } from '../core/track/KGAudioTrack';
 import { KGAudioRegion } from '../core/region/KGAudioRegion';
+import { KGMidiRegion } from '../core/region/KGMidiRegion';
+import { KGMidiNote } from '../core/midi/KGMidiNote';
 import { createDefaultGlobalTracks } from '../core/global-track';
 import { getAudioRegionDisplayLengthBeats } from '../util/globalTrackUtil';
 
@@ -35,6 +37,9 @@ let mockTracks: KGTrack[] = [new KGMidiTrack('Track 1', 0, 'acoustic_grand_piano
 let mockIsMetronomeEnabled = false;
 let mockShowGlobalTracks = false;
 let mockPlayheadPosition = 0;
+let mockSelectedItems: Array<{ getId: () => string; select: () => void; deselect: () => void; isSelected: () => boolean }> = [];
+let mockCopiedItems: Array<{ getId: () => string }> = [];
+const selectionChangedCallbacks: Array<() => void> = [];
 const mockProject = {
   getTimeSignature: () => ({ numerator: 4, denominator: 4 }),
   getMaxBars: () => 32,
@@ -90,8 +95,11 @@ const mockCore = {
   setPlayheadUpdateCallback: vi.fn(),
   setPlaybackStateChangeCallback: vi.fn(),
   setLoopBoundaryReachedCallback: vi.fn(),
-  getSelectedItems: () => [],
+  getSelectedItems: () => mockSelectedItems,
-  onSelectionChanged: vi.fn(),
+  getCopiedItems: () => mockCopiedItems,
+  onSelectionChanged: vi.fn((callback: () => void) => {
+    selectionChangedCallbacks.push(callback);
+  }),
   canUndo: () => false,
   canRedo: () => false,
   getUndoDescription: () => '',
@@ -100,7 +108,16 @@ const mockCore = {
   executeCommand: vi.fn(),
   undo: vi.fn(() => true),
   redo: vi.fn(() => true),
-  clearSelectedItems: vi.fn(),
+  clearSelectedItems: vi.fn(() => {
+    mockSelectedItems = [];
+    selectionChangedCallbacks.forEach(callback => callback());
+  }),
+  addSelectedItems: vi.fn((items: Array<{ getId: () => string; select: () => void; deselect: () => void; isSelected: () => boolean }>) => {
+    const incomingIds = new Set(items.map(item => item.getId()));
+    mockSelectedItems = mockSelectedItems.filter(item => !incomingIds.has(item.getId()));
+    mockSelectedItems.push(...items);
+    selectionChangedCallbacks.forEach(callback => callback());
+  }),
   getStatus: () => 'Ready',
   setStatus: vi.fn(),
   getPlayheadPosition: () => mockPlayheadPosition,
@@ -197,6 +214,12 @@ describe('projectStore piano roll state', () => {
     audioStorageMocks.loadAudioFile.mockReset();
     toneMocks.decodeAudioData.mockReset();
     toneMocks.toneBufferSet.mockReset();
+    mockSelectedItems = [];
+    mockCopiedItems = [];
+    selectionChangedCallbacks.length = 0;
+    mockCore.onSelectionChanged.mockClear();
+    mockCore.clearSelectedItems.mockClear();
+    mockCore.addSelectedItems.mockClear();
     mockIsMetronomeEnabled = false;
     mockShowGlobalTracks = false;
     mockProject.setIsMetronomeEnabled.mockClear();
@@ -737,4 +760,81 @@ describe('projectStore piano roll state', () => {
     expect(state.maxBars).toBe(16);
     expect(state.playheadPosition).toBe(64);
   });
+
+  it('selects only the newly pasted notes after pasting into the active MIDI region', async () => {
+    const { KGMidiTrack: TestMidiTrack } = await import('../core/track/KGMidiTrack');
+    const { KGMidiRegion: TestMidiRegion } = await import('../core/region/KGMidiRegion');
+    const { KGMidiNote: TestMidiNote } = await import('../core/midi/KGMidiNote');
+    const track = new TestMidiTrack('Track 1', 1, 'acoustic_grand_piano');
+    track.setTrackIndex(0);
+    const region = new TestMidiRegion('region-1', '1', 0, 'Region 1', 0, 16);
+    const existingSelectedNote = new TestMidiNote('existing-note', 0, 1, 60, 100);
+    existingSelectedNote.select();
+    region.addNote(existingSelectedNote);
+    track.setRegions([region]);
+
+    mockTracks = [track];
+    currentProject = {
+      ...mockProject,
+      getTracks: () => mockTracks,
+    } as typeof mockProject;
+
+    mockSelectedItems = [existingSelectedNote];
+    mockCopiedItems = [
+      new TestMidiNote('copied-a', 2, 3, 64, 110),
+      new TestMidiNote('copied-b', 3, 4, 67, 120),
+    ];
+    mockCore.executeCommand.mockImplementation((command: { execute: () => void }) => command.execute());
+
+    const { useProjectStore } = await import('./projectStore');
+
+    act(() => {
+      useProjectStore.getState().pasteNotesToActiveRegion(region.getId(), 8);
+    });
+
+    const pastedNotes = region.getNotes().filter(note => note.getId() !== existingSelectedNote.getId());
+    const pastedNoteIds = pastedNotes.map(note => note.getId());
+    const state = useProjectStore.getState();
+
+    expect(mockCore.executeCommand).toHaveBeenCalledTimes(1);
+    expect(existingSelectedNote.isSelected()).toBe(false);
+    expect(pastedNotes).toHaveLength(2);
+    expect(pastedNotes.every(note => note.isSelected())).toBe(true);
+    expect(mockCore.clearSelectedItems).toHaveBeenCalledTimes(1);
+    expect(mockCore.addSelectedItems).toHaveBeenCalledWith(pastedNotes);
+    expect(state.selectedNoteIds).toEqual(pastedNoteIds);
+  });
+
+  it('keeps selection unchanged when note paste has no clipboard notes', async () => {
+    const { KGMidiTrack: TestMidiTrack } = await import('../core/track/KGMidiTrack');
+    const { KGMidiRegion: TestMidiRegion } = await import('../core/region/KGMidiRegion');
+    const { KGMidiNote: TestMidiNote } = await import('../core/midi/KGMidiNote');
+    const track = new TestMidiTrack('Track 1', 1, 'acoustic_grand_piano');
+    track.setTrackIndex(0);
+    const region = new TestMidiRegion('region-1', '1', 0, 'Region 1', 0, 16);
+    const existingSelectedNote = new TestMidiNote('existing-note', 0, 1, 60, 100);
+    existingSelectedNote.select();
+    region.addNote(existingSelectedNote);
+    track.setRegions([region]);
+
+    mockTracks = [track];
+    currentProject = {
+      ...mockProject,
+      getTracks: () => mockTracks,
+    } as typeof mockProject;
+
+    mockSelectedItems = [existingSelectedNote];
+    mockCopiedItems = [];
+
+    const { useProjectStore } = await import('./projectStore');
+
+    act(() => {
+      useProjectStore.getState().pasteNotesToActiveRegion(region.getId(), 8);
+    });
+
+    expect(mockCore.executeCommand).not.toHaveBeenCalled();
+    expect(mockCore.clearSelectedItems).not.toHaveBeenCalled();
+    expect(mockCore.addSelectedItems).not.toHaveBeenCalled();
+    expect(existingSelectedNote.isSelected()).toBe(true);
+  });
 });

src/stores/projectStore.ts

@@ -1052,6 +1052,7 @@ export const useProjectStore = create<ProjectState>((set, get) => {
 
         // Reset piano roll state for new/loaded project
         KGPianoRollState.instance().setLastEditedNoteLength(1);
+        KGPianoRollState.instance().setLastEditedNoteVelocity(127);
         KGPianoRollState.instance().setPianoRollZoom(projectToLoad.getPianoRollZoom());
 
         // Add a status message
@@ -1904,7 +1905,26 @@ export const useProjectStore = create<ProjectState>((set, get) => {
       }
 
       try {
-        KGCore.instance().executeCommand(command);
+        const core = KGCore.instance();
+        core.executeCommand(command);
+
+        const createdNoteIds = new Set(command.getCreatedNotes().map(note => note.noteId));
+        const targetRegion = command.getTargetRegion();
+        const createdNotes = targetRegion
+          ? targetRegion.getNotes().filter(note => createdNoteIds.has(note.getId()))
+          : [];
+
+        if (createdNotes.length > 0) {
+          core.getSelectedItems().forEach(item => {
+            item.deselect();
+          });
+          core.clearSelectedItems();
+
+          createdNotes.forEach(note => {
+            note.select();
+          });
+          core.addSelectedItems(createdNotes);
+        }
 
         // Update the store to trigger re-render
         const { tracks } = get();