Odysseus v1.0

static/js/editor/canvas-events.js

@@ -0,0 +1,197 @@
+/**
+ * Canvas event wiring — mouse, touch (including pinch-zoom on two
+ * fingers), and the canvas-area pan handler.
+ *
+ *   Mouse:
+ *     mousedown on canvas    → beginDraw
+ *     mousemove on window    → continueDraw (window so a drag can
+ *                              continue past the canvas edge)
+ *     mouseup on window      → endDraw
+ *     mouseenter/mouseleave  → show/hide the brush-cursor overlay
+ *     mousedown on canvas-area (NOT on the canvas itself, lasso only)
+ *                            → beginDraw (lasso starts outside canvas)
+ *
+ *   Touch:
+ *     touchstart 1 finger    → beginDraw
+ *     touchmove  1 finger    → continueDraw
+ *     touchend / touchcancel → endDraw
+ *     touchstart 2 fingers   → pinch-zoom + 2-finger pan
+ *
+ *   Pan (any free space around the canvas):
+ *     pointerdown / pointermove / pointerup on canvas-area, skipping
+ *     the canvas + transform overlay + UI elements above them. Sets
+ *     canvasArea.dataset.panX/Y + CSS transform on both canvases.
+ *
+ *   Exposes `canvasArea._resetPan()` so the zoom/fit reset can clear
+ *   the pan offset.
+ *
+ * @param {{
+ *   canvasArea:        HTMLDivElement,
+ *   beginDraw:         (e: Event) => void,
+ *   continueDraw:      (e: Event) => void,
+ *   endDraw:           (e?: Event) => void,
+ *   updateBrushCursor: (e: Event) => void,
+ *   syncZoomControls?: () => void,
+ * }} ctx
+ */
+import { state } from './state.js';
+
+export function wireCanvasEvents({ canvasArea, beginDraw, continueDraw, endDraw, updateBrushCursor, syncZoomControls }) {
+  // Mouse — mousedown stays on the canvas; mousemove/up are bound to
+  // the WINDOW so a drag can continue (and end) past the canvas edge.
+  // Critical for the Resize tool where users overshoot.
+  state.mainCanvas.addEventListener('mousedown', beginDraw);
+  window.addEventListener('mousemove', continueDraw);
+  window.addEventListener('mouseup', endDraw);
+  // Lasso can start OUTSIDE the canvas — fallback mousedown on the
+  // surrounding canvas-area so the user can begin a lasso path in
+  // the empty space around the image. Other tools stay canvas-only.
+  canvasArea.addEventListener('mousedown', (e) => {
+    if (state.tool !== 'lasso') return;
+    if (e.target === state.mainCanvas) return; // already handled
+    beginDraw(e);
+  });
+  state.mainCanvas.addEventListener('mouseenter', (e) => {
+    if (['brush', 'eraser', 'inpaint', 'lasso', 'clone'].includes(state.tool)) updateBrushCursor(e);
+  });
+  state.mainCanvas.addEventListener('mouseleave', () => {
+    // Only hide the brush-cursor overlay on leave — DO NOT end the
+    // drag, so the user can drag a resize handle past the canvas edge.
+    if (state.cursorEl) state.cursorEl.style.display = 'none';
+  });
+
+  // Touch — single finger draws; two fingers pan + pinch-zoom.
+  let multiActive = false;
+  let multiStartDist = 0;
+  let multiStartZoom = 1;
+  let multiStartCenter = { x: 0, y: 0 };
+  let multiStartPan = { x: 0, y: 0 };
+  const touchInfo = (e) => {
+    const t1 = e.touches[0], t2 = e.touches[1];
+    const cx = (t1.clientX + t2.clientX) / 2;
+    const cy = (t1.clientY + t2.clientY) / 2;
+    const dx = t2.clientX - t1.clientX;
+    const dy = t2.clientY - t1.clientY;
+    return { cx, cy, dist: Math.hypot(dx, dy) };
+  };
+  const applyCanvasOffset = (x, y) => {
+    canvasArea.dataset.panX = String(x);
+    canvasArea.dataset.panY = String(y);
+    const t = `translate3d(${x}px, ${y}px, 0)`;
+    state.mainCanvas.style.transform = t;
+    if (state.transformOverlay) state.transformOverlay.style.transform = t;
+  };
+  state.mainCanvas.addEventListener('touchstart', (e) => {
+    e.preventDefault();
+    if (e.touches.length >= 2) {
+      // End any in-progress single-finger draw before switching modes.
+      if (!multiActive) endDraw();
+      multiActive = true;
+      const info = touchInfo(e);
+      multiStartDist = info.dist;
+      multiStartZoom = state.zoom;
+      multiStartCenter = { x: info.cx, y: info.cy };
+      multiStartPan = {
+        x: parseFloat(canvasArea.dataset.panX || '0') || 0,
+        y: parseFloat(canvasArea.dataset.panY || '0') || 0,
+      };
+      return;
+    }
+    if (multiActive) return;
+    beginDraw(e);
+  }, { passive: false });
+  state.mainCanvas.addEventListener('touchmove', (e) => {
+    e.preventDefault();
+    if (multiActive && e.touches.length >= 2) {
+      const info = touchInfo(e);
+      const ratio = info.dist / Math.max(1, multiStartDist);
+      const newZoom = Math.max(0.1, Math.min(5, multiStartZoom * ratio));
+      if (Math.abs(newZoom - state.zoom) > 0.001) {
+        state.zoom = newZoom;
+        state.mainCanvas.style.width = (state.imgWidth * state.zoom) + 'px';
+        state.mainCanvas.style.height = (state.imgHeight * state.zoom) + 'px';
+        const label = state.container.querySelector('.ge-zoom-label');
+        if (label) label.textContent = Math.round(state.zoom * 100) + '%';
+        syncZoomControls?.();
+      }
+      const dx = info.cx - multiStartCenter.x;
+      const dy = info.cy - multiStartCenter.y;
+      applyCanvasOffset(multiStartPan.x + dx, multiStartPan.y + dy);
+      return;
+    }
+    if (multiActive) return;
+    continueDraw(e);
+  }, { passive: false });
+  state.mainCanvas.addEventListener('touchend', (e) => {
+    if (multiActive) {
+      if (e.touches.length < 2) multiActive = false;
+      return;
+    }
+    endDraw(e);
+  });
+  state.mainCanvas.addEventListener('touchcancel', () => {
+    multiActive = false;
+    endDraw();
+  });
+
+  // Press-and-drag in the empty space AROUND the canvas pans the
+  // canvas + overlay via CSS transform. Works even when the image
+  // fits the viewport (no scroll needed). Skips presses on the canvas
+  // itself (the canvas owns its own drawing input) or on UI elements
+  // above it.
+  let panning = false;
+  let pid = null;
+  let startX = 0, startY = 0;
+  const getOffset = () => {
+    const v = canvasArea.dataset.panX || '0';
+    const u = canvasArea.dataset.panY || '0';
+    return { x: parseFloat(v) || 0, y: parseFloat(u) || 0 };
+  };
+  const applyOffset = (x, y) => {
+    canvasArea.dataset.panX = String(x);
+    canvasArea.dataset.panY = String(y);
+    const t = `translate3d(${x}px, ${y}px, 0)`;
+    state.mainCanvas.style.transform = t;
+    if (state.transformOverlay) state.transformOverlay.style.transform = t;
+  };
+  canvasArea.addEventListener('pointerdown', (e) => {
+    if (state.tool === 'lasso') return;
+    if (e.target === state.mainCanvas || e.target === state.transformOverlay) return;
+    if (e.target.closest('button, input, .ge-adj-popup, .ge-transform-popup, .ge-fx-popup, .ge-inpaint-popup, .ge-controls, .ge-right-panel, .ge-fx-menu')) return;
+    // During an active transform the corner/rotation handles render
+    // OUTSIDE the canvas (over the surrounding area), and the overlay is
+    // pointer-events:none — so a grab on an outside handle lands here.
+    // Route it to the transform tool (getHandleAt works in image space,
+    // even for points beyond the canvas) instead of panning the canvas.
+    if (state.transformActive) {
+      beginDraw(e);
+      // Only swallow the event (skip pan) if a handle was grabbed OR the
+      // layer-move fallback engaged; otherwise let the pan logic below
+      // run so empty space still pans while the transform tool is open.
+      if (state.transformHandle || state.moving) return;
+    }
+    const off = getOffset();
+    panning = true;
+    pid = e.pointerId;
+    startX = e.clientX - off.x;
+    startY = e.clientY - off.y;
+    try { canvasArea.setPointerCapture(pid); } catch {}
+    canvasArea.style.cursor = 'grabbing';
+    e.preventDefault();
+  });
+  canvasArea.addEventListener('pointermove', (e) => {
+    if (!panning || e.pointerId !== pid) return;
+    applyOffset(e.clientX - startX, e.clientY - startY);
+  });
+  const endPan = () => {
+    if (!panning) return;
+    panning = false;
+    try { canvasArea.releasePointerCapture(pid); } catch {}
+    pid = null;
+    canvasArea.style.cursor = '';
+  };
+  canvasArea.addEventListener('pointerup', endPan);
+  canvasArea.addEventListener('pointercancel', endPan);
+  // Reset offset whenever zoom/fit changes the canvas size.
+  canvasArea._resetPan = () => applyOffset(0, 0);
+}