feat: refactor the add track behavior to use a pop-up instead

src/components/MainContent.css

@@ -3,14 +3,16 @@
   display: flex;
   flex-direction: column;
   flex: 1;
-  overflow: auto; /* Main scrollable container */
+  overflow: auto;
+  /* Main scrollable container */
   position: relative;
 }
 
 .main-content-wrapper {
   display: flex;
   flex-direction: column;
-  min-width: calc(var(--track-info-panel-width) + var(--max-number-of-bars) * var(--track-grid-bar-width)); /* info width + grid width */
+  min-width: calc(var(--track-info-panel-width) + var(--max-number-of-bars) * var(--track-grid-bar-width));
+  /* info width + grid width */
   min-height: fit-content;
   position: relative;
 }
@@ -24,12 +26,75 @@
   background-color: #2d2d2d;
   border-bottom: 1px solid #3a3a3a;
   border-right: 1px solid #3a3a3a;
-  z-index: 1002; /* Higher than other elements to ensure it's always visible */
+  z-index: 1002;
+  /* Higher than other elements to ensure it's always visible */
   display: flex;
   flex-direction: row;
   align-items: stretch;
 }
 
+.track-header-controls {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  width: 100%;
+  padding: 0 12px;
+  box-sizing: border-box;
+}
+
+.track-header-button {
+  --toolbar-button-bg: transparent;
+  --toolbar-button-fg: #e0e0e0;
+  width: 28px;
+  height: 28px;
+  border: none;
+  border-radius: 3px;
+  background-color: var(--toolbar-button-bg);
+  color: var(--toolbar-button-fg);
+  display: inline-flex;
+  align-items: center;
+  font-size: 12px;
+  justify-content: center;
+  cursor: pointer;
+  transition:
+    background-color 0.18s ease,
+    color 0.18s ease,
+    transform 0.12s ease,
+    box-shadow 0.18s ease;
+}
+
+.track-header-button svg {
+  font-size: 14px;
+}
+
+.track-header-button:hover {
+  --toolbar-button-bg: #3a3a3a;
+}
+
+.track-header-button.active {
+  --toolbar-button-bg: #e0e0e0;
+  --toolbar-button-fg: #2d2d2d;
+}
+
+.track-header-button.active:hover {
+  --toolbar-button-bg: #f0f0f0;
+}
+
+.track-header-button:active {
+  --toolbar-button-bg: #5a5a5a;
+  transform: scale(0.95);
+}
+
+.track-header-button.active:active {
+  --toolbar-button-bg: #d6d6d6;
+}
+
+.track-header-button:focus,
+.track-header-button:focus-visible {
+  outline: none;
+  box-shadow: none;
+}
+
 /* Offset spacer when instrument selection panel is visible on the left */
 .main-content.has-left-instrument .top-left-spacer {
   left: 300px;
@@ -43,9 +108,12 @@
   border-bottom: 1px solid #3a3a3a;
   background-color: #2d2d2d;
   z-index: 20;
-  margin-left: var(--track-info-panel-width); /* Offset for info-container */
-  width: calc(var(--max-number-of-bars) * var(--track-grid-bar-width)); /* Exact width for 32 bars */
-  cursor: pointer; /* Show pointer cursor on hover to indicate interactivity */
+  margin-left: var(--track-info-panel-width);
+  /* Offset for info-container */
+  width: calc(var(--max-number-of-bars) * var(--track-grid-bar-width));
+  /* Exact width for 32 bars */
+  cursor: pointer;
+  /* Show pointer cursor on hover to indicate interactivity */
 }
 
 .bar-numbers:hover {
@@ -135,8 +203,11 @@
 }
 
 .grid-container {
-  margin-left: 0; /* No need for margin since we're using flex */
-  min-width: calc(var(--max-number-of-bars) * var(--track-grid-bar-width)); /* Ensure minimum width */
+  margin-left: 0;
+  /* No need for margin since we're using flex */
+  min-width: calc(var(--max-number-of-bars) * var(--track-grid-bar-width));
+  /* Ensure minimum width */
   min-height: fit-content;
-  position: relative; /* Required for absolute positioned playhead */
+  position: relative;
+  /* Required for absolute positioned playhead */
 }

src/components/MainContent.test.tsx

@@ -69,6 +69,13 @@ type StoreSelector = (...args: [typeof storeState]) => unknown;
 // eslint-disable-next-line no-unused-vars
 type RegionClickHandler = (...args: [string, { shiftKey: boolean }]) => void;
 
+const finishTrackCreateDialogClose = () => {
+  const overlay = document.querySelector('.dialog-overlay');
+  if (overlay) {
+    fireEvent.animationEnd(overlay);
+  }
+};
+
 vi.mock('../stores/projectStore', () => ({
   useProjectStore: (selector?: StoreSelector) => (
     selector ? selector(storeState) : storeState
@@ -138,6 +145,8 @@ describe('MainContent', () => {
     storeState.setActiveRegionId.mockClear();
     storeState.openMidiPianoRoll.mockClear();
     storeState.openSpectrogramViewer.mockClear();
+    storeState.addTrack.mockClear();
+    storeState.addAudioTrack.mockClear();
   });
 
   it('updates activeRegionId when selecting a region with piano roll closed', () => {
@@ -205,11 +214,11 @@ describe('MainContent', () => {
     expect(storeState.setActiveRegionId).toHaveBeenCalledWith(null);
   });
 
-  it('renders the two-row timeline ruler with add-track buttons and beat markers', () => {
+  it('renders the two-row timeline ruler with track controls and beat markers', () => {
     const { container } = render(<MainContent />);
 
-    expect(screen.getByRole('button', { name: '+ MIDI' })).toBeInTheDocument();
-    expect(screen.getByRole('button', { name: '+ Audio' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'Create track' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'Show global tracks' })).toBeInTheDocument();
 
     const barCells = container.querySelectorAll('[data-testid="bar-number-cell"]');
     expect(barCells).toHaveLength(storeState.maxBars);
@@ -230,4 +239,66 @@ describe('MainContent', () => {
 
     expect(firstBeatRow?.querySelectorAll('.beat-marker')).toHaveLength(2);
   });
+
+  it('opens the track creation modal with MIDI selected by default', () => {
+    render(<MainContent />);
+
+    fireEvent.click(screen.getByRole('button', { name: 'Create track' }));
+
+    expect(screen.getByRole('dialog', { name: 'Create New Track' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'MIDI' }).className).toContain('selected');
+    expect(screen.getByRole('button', { name: 'Audio' }).className).not.toContain('selected');
+    expect(screen.getByRole('button', { name: 'Cancel' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'Create' })).toBeInTheDocument();
+  });
+
+  it('creates an audio track when audio is selected in the modal', () => {
+    render(<MainContent />);
+
+    fireEvent.click(screen.getByRole('button', { name: 'Create track' }));
+    fireEvent.click(screen.getByRole('button', { name: 'Audio' }));
+    fireEvent.click(screen.getByRole('button', { name: 'Create' }));
+    finishTrackCreateDialogClose();
+
+    expect(storeState.addAudioTrack).toHaveBeenCalledTimes(1);
+    expect(storeState.addTrack).not.toHaveBeenCalled();
+    expect(screen.queryByRole('dialog', { name: 'Create New Track' })).not.toBeInTheDocument();
+  });
+
+  it('creates a MIDI track by default when confirming the modal', () => {
+    render(<MainContent />);
+
+    fireEvent.click(screen.getByRole('button', { name: 'Create track' }));
+    fireEvent.click(screen.getByRole('button', { name: 'Create' }));
+    finishTrackCreateDialogClose();
+
+    expect(storeState.addTrack).toHaveBeenCalledTimes(1);
+    expect(storeState.addAudioTrack).not.toHaveBeenCalled();
+  });
+
+  it('closes the track creation modal without creating a track when canceled', () => {
+    render(<MainContent />);
+
+    fireEvent.click(screen.getByRole('button', { name: 'Create track' }));
+    fireEvent.click(screen.getByRole('button', { name: 'Cancel' }));
+    finishTrackCreateDialogClose();
+
+    expect(storeState.addTrack).not.toHaveBeenCalled();
+    expect(storeState.addAudioTrack).not.toHaveBeenCalled();
+    expect(screen.queryByRole('dialog', { name: 'Create New Track' })).not.toBeInTheDocument();
+  });
+
+  it('toggles the mock global tracks button active state locally', () => {
+    render(<MainContent />);
+
+    const globalTracksButton = screen.getByRole('button', { name: 'Show global tracks' });
+
+    expect(globalTracksButton.className).not.toContain('active');
+
+    fireEvent.click(globalTracksButton);
+    expect(globalTracksButton.className).toContain('active');
+
+    fireEvent.click(globalTracksButton);
+    expect(globalTracksButton.className).not.toContain('active');
+  });
 });

src/components/MainContent.tsx

@@ -10,6 +10,7 @@ import { KGAudioRegion } from '../core/region/KGAudioRegion';
 import TrackInfoPanel from './track/TrackInfoPanel';
 import TrackGridPanel from './track/TrackGridPanel';
 import PianoRoll from './piano-roll/PianoRoll';
+import { TrackCreateDialog } from './common';
 import type { RegionClickOptions, RegionUI } from './interfaces';
 import { DEBUG_MODE, BAR_NUMBERS_CONSTANTS, TOOLBAR_CONSTANTS } from '../constants';
 import { useRegionOperations } from '../hooks/useRegionOperations';
@@ -17,6 +18,8 @@ import { regionDeleteManager } from '../util/regionDeleteUtil';
 import { KGMainContentState } from '../core/state/KGMainContentState';
 import { ChangeLoopSettingsCommand } from '../core/commands';
 import { DeleteTrackAutomationPointsCommand } from '../core/commands';
+import { FaPlus } from 'react-icons/fa';
+import { FaSquareArrowUpRight } from 'react-icons/fa6';
 
 interface MainContentProps {
   onTrackClick?: () => void;
@@ -76,6 +79,8 @@ const MainContent: React.FC<MainContentProps> = ({
 
   // Region selection state
   const [selectedRegionId, setSelectedRegionId] = useState<string | null>(null);
+  const [showCreateTrackModal, setShowCreateTrackModal] = useState(false);
+  const [showGlobalTracksMock, setShowGlobalTracksMock] = useState(false);
 
   // Use the region operations hook
   const { deleteSelectedRegions } = useRegionOperations({
@@ -763,6 +768,11 @@ const MainContent: React.FC<MainContentProps> = ({
     setActiveRegionId(null);
   };
 
+  const openCreateTrackModal = useCallback((e?: React.MouseEvent<HTMLButtonElement>) => {
+    e?.stopPropagation();
+    setShowCreateTrackModal(true);
+  }, []);
+
   /**
    * Add keyboard event listener for region deletion
    * Handles Backspace (Windows) and Delete (Mac) keys to delete selected regions
@@ -1011,8 +1021,29 @@ const MainContent: React.FC<MainContentProps> = ({
       <div className="main-content-wrapper" onClick={handleEmptyMainContentClick}>
         {/* Top-left spacer */}
         <div className="top-left-spacer">
-          <button className="add-track-btn" onClick={() => addTrack()}>+ MIDI</button>
-          <button className="add-track-btn" onClick={() => addAudioTrack()}>+ Audio</button>
+          <div className="track-header-controls">
+            <button
+              type="button"
+              className="track-header-button"
+              aria-label="Create track"
+              title="Create track"
+              onClick={openCreateTrackModal}
+            >
+              <FaPlus />
+            </button>
+            <button
+              type="button"
+              className={`track-header-button${showGlobalTracksMock ? ' active' : ''}`}
+              aria-label="Show global tracks"
+              title="Show global tracks"
+              onClick={(e) => {
+                e.stopPropagation();
+                setShowGlobalTracksMock(prev => !prev);
+              }}
+            >
+              <FaSquareArrowUpRight />
+            </button>
+          </div>
         </div>
 
         {/* Bar numbers at the top */}
@@ -1077,6 +1108,18 @@ const MainContent: React.FC<MainContentProps> = ({
       </div>
 
       {/* Piano Roll / Spectrogram Viewer - render using portal */}
+      {showCreateTrackModal && (
+        <TrackCreateDialog
+          onResolve={(result) => {
+            setShowCreateTrackModal(false);
+            if (result === 'audio') {
+              addAudioTrack();
+            } else if (result === 'midi') {
+              addTrack();
+            }
+          }}
+        />
+      )}
       {showPianoRoll && createPortal(
         <PianoRoll
           onClose={handlePianoRollClose}

src/components/common/TrackCreateDialog.css

@@ -0,0 +1,62 @@
+.track-create-dialog-modal {
+  max-width: 520px;
+}
+
+.track-create-dialog-body {
+  display: grid;
+  grid-template-columns: repeat(2, minmax(0, 1fr));
+  gap: 16px;
+}
+
+.track-create-option {
+  border: 1px solid #4a4a4a;
+  border-radius: 12px;
+  background: linear-gradient(180deg, #323232 0%, #282828 100%);
+  color: #e0e0e0;
+  padding: 28px 18px 24px;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 18px;
+  cursor: pointer;
+  transition:
+    border-color 0.18s ease,
+    background-color 0.18s ease,
+    box-shadow 0.18s ease,
+    transform 0.12s ease;
+}
+
+.track-create-option:hover {
+  border-color: #6a6a6a;
+  transform: translateY(-1px);
+}
+
+.track-create-option.selected {
+  border-color: #e1ae01;
+  box-shadow: inset 0 0 0 1px rgba(225, 174, 1, 0.35);
+}
+
+.track-create-option-icon {
+  width: 72px;
+  height: 72px;
+  border-radius: 50%;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 30px;
+  color: #ffffff;
+}
+
+.track-create-option-icon.midi {
+  background-color: #159947;
+}
+
+.track-create-option-icon.audio {
+  background-color: #1f78d1;
+}
+
+.track-create-option-label {
+  font-size: 28px;
+  font-weight: 700;
+  letter-spacing: -0.02em;
+}

src/components/common/TrackCreateDialog.tsx

@@ -0,0 +1,116 @@
+import React, { useCallback, useEffect, useRef, useState } from 'react';
+import { createPortal } from 'react-dom';
+import { FaMusic, FaTimes } from 'react-icons/fa';
+import { FaWaveSquare } from 'react-icons/fa6';
+import './DialogProvider.css';
+import './TrackCreateDialog.css';
+
+type TrackCreateDialogResult = 'cancel' | 'midi' | 'audio';
+
+interface TrackCreateDialogProps {
+  onResolve: (result: TrackCreateDialogResult) => void;
+}
+
+const TrackCreateDialog: React.FC<TrackCreateDialogProps> = ({ onResolve }) => {
+  const [selectedTrackType, setSelectedTrackType] = useState<'midi' | 'audio'>('midi');
+  const [isClosing, setIsClosing] = useState(false);
+  const pendingResultRef = useRef<TrackCreateDialogResult>('cancel');
+  const mouseDownOnOverlay = useRef(false);
+
+  const close = useCallback((result: TrackCreateDialogResult) => {
+    pendingResultRef.current = result;
+    setIsClosing(true);
+  }, []);
+
+  useEffect(() => {
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (event.key === 'Escape') {
+        close('cancel');
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [close]);
+
+  const handleAnimationEnd = useCallback((e: React.AnimationEvent<HTMLDivElement>) => {
+    if (e.target !== e.currentTarget) return;
+    if (!isClosing) return;
+    onResolve(pendingResultRef.current);
+  }, [isClosing, onResolve]);
+
+  return createPortal(
+    <div
+      className={`dialog-overlay${isClosing ? ' dialog-overlay-closing' : ''}`}
+      onMouseDown={(e) => {
+        mouseDownOnOverlay.current = e.target === e.currentTarget;
+      }}
+      onClick={(e) => {
+        if (e.target === e.currentTarget && mouseDownOnOverlay.current) {
+          close('cancel');
+        }
+      }}
+      onAnimationEnd={handleAnimationEnd}
+    >
+      <div
+        className={`dialog-modal track-create-dialog-modal${isClosing ? ' dialog-modal-closing' : ''}`}
+        role="dialog"
+        aria-modal="true"
+        aria-labelledby="track-create-title"
+        onClick={(e) => e.stopPropagation()}
+      >
+        <div className="dialog-header">
+          <h3 id="track-create-title" className="dialog-title">Create New Track</h3>
+          <button
+            className="dialog-close-btn"
+            onClick={() => close('cancel')}
+            aria-label="Close dialog"
+          >
+            <FaTimes />
+          </button>
+        </div>
+        <div className="dialog-body track-create-dialog-body">
+          <button
+            type="button"
+            className={`track-create-option${selectedTrackType === 'midi' ? ' selected' : ''}`}
+            onClick={() => setSelectedTrackType('midi')}
+          >
+            <div className="track-create-option-icon midi">
+              <FaMusic />
+            </div>
+            <span className="track-create-option-label">MIDI</span>
+          </button>
+          <button
+            type="button"
+            className={`track-create-option${selectedTrackType === 'audio' ? ' selected' : ''}`}
+            onClick={() => setSelectedTrackType('audio')}
+          >
+            <div className="track-create-option-icon audio">
+              <FaWaveSquare />
+            </div>
+            <span className="track-create-option-label">Audio</span>
+          </button>
+        </div>
+        <div className="dialog-footer">
+          <button
+            type="button"
+            className="dialog-btn dialog-btn-cancel"
+            onClick={() => close('cancel')}
+          >
+            Cancel
+          </button>
+          <button
+            type="button"
+            className="dialog-btn dialog-btn-primary"
+            onClick={() => close(selectedTrackType)}
+          >
+            Create
+          </button>
+        </div>
+      </div>
+    </div>,
+    document.body
+  );
+};
+
+export default TrackCreateDialog;

src/components/common/index.ts

@@ -4,5 +4,6 @@ export { default as FileImportModal } from './FileImportModal';
 export { default as LoadingOverlay } from './LoadingOverlay';
 export { default as OpenProjectModal } from './OpenProjectModal';
 export { default as DialogProvider } from './DialogProvider';
+export { default as TrackCreateDialog } from './TrackCreateDialog';
 export { showAlert, showConfirm, showPrompt, showTimeSigPrompt } from '../../util/dialogUtil';
 export type { ConfirmOptions, PromptOptions, TimeSigResult } from '../../util/dialogUtil';