1 files changed, 193 insertions, 0 deletions
diff --git a/web/js/imageViewer.js b/web/js/imageViewer.js
new file mode 100644
index 0000000..09e1563
--- /dev/null
+++ b/web/js/imageViewer.js
@@ -0,0 +1,193 @@
+let els = () => ({});
+let isImageMode = () => false;
+let playNext = () => {};
+
+let zoomScale = 1;
+let panX = 0;
+let panY = 0;
+let isPanning = false;
+let panStart = { x: 0, y: 0 };
+let slideshowTimer = null;
+let slideshowPausedUntil = 0;
+let cropMode = false;
+let cropPositionX = 50;
+let cropPositionY = 50;
+const CROP_PRESETS = [
+  { x: 50, y: 50, label: 'C' },
+  { x: 50, y: 0, label: 'T' },
+  { x: 50, y: 100, label: 'B' },
+  { x: 0, y: 50, label: 'L' },
+  { x: 100, y: 50, label: 'R' },
+];
+let cropPresetIndex = 0;
+
+export function initImageViewer(options = {}) {
+  els = typeof options.els === 'function' ? options.els : els;
+  isImageMode = typeof options.isImageMode === 'function' ? options.isImageMode : isImageMode;
+  playNext = typeof options.playNext === 'function' ? options.playNext : playNext;
+
+  const e = els();
+  e.btnZoomIn?.addEventListener('click', () => { zoomIn(); pauseSlideshow(); });
+  e.btnZoomOut?.addEventListener('click', () => { zoomOut(); pauseSlideshow(); });
+  e.btnSlideshow?.addEventListener('click', toggleSlideshow);
+
+  e.image?.addEventListener('mousedown', (ev) => {
+    if (zoomScale > 1) {
+      isPanning = true;
+      panStart = { x: ev.clientX - panX, y: ev.clientY - panY };
+      e.image.style.cursor = 'grabbing';
+      ev.preventDefault();
+    }
+  });
+  e.image?.addEventListener('wheel', (ev) => {
+    ev.preventDefault();
+    if (ev.deltaY < 0) zoomIn();
+    else zoomOut();
+  }, { passive: false });
+  window.addEventListener('mousemove', (ev) => {
+    if (!isPanning) return;
+    panX = ev.clientX - panStart.x;
+    panY = ev.clientY - panStart.y;
+    applyImageTransform();
+  });
+  window.addEventListener('mouseup', () => {
+    if (isPanning) {
+      isPanning = false;
+      const image = els().image;
+      if (image) image.style.cursor = zoomScale > 1 ? 'grab' : 'zoom-in';
+    }
+  });
+}
+
+function setImageZoom(s) {
+  zoomScale = Math.max(0.5, Math.min(s, 5));
+  applyImageTransform();
+}
+
+function applyImageTransform() {
+  const e = els();
+  if (!e.image) return;
+  e.image.style.transform = `translate(${panX}px, ${panY}px) scale(${zoomScale})`;
+  e.image.style.cursor = zoomScale > 1 ? 'grab' : 'zoom-in';
+}
+
+export function resetImageZoom() {
+  zoomScale = 1;
+  panX = 0;
+  panY = 0;
+  applyImageTransform();
+}
+
+export function zoomIn() {
+  setImageZoom(zoomScale * 1.25);
+}
+
+export function zoomOut() {
+  setImageZoom(zoomScale / 1.25);
+}
+
+export function resetZoom() {
+  resetImageZoom();
+}
+
+export function toggleSlideshow() {
+  if (slideshowTimer) stopSlideshow();
+  else startSlideshow();
+}
+
+export function isSlideshowActive() {
+  return !!slideshowTimer;
+}
+
+function startSlideshow() {
+  if (slideshowTimer) clearInterval(slideshowTimer);
+  slideshowTimer = setInterval(() => {
+    if (Date.now() < slideshowPausedUntil) return;
+    if (!isImageMode()) { stopSlideshow(); return; }
+    playNext();
+  }, 5000);
+  const btn = els().btnSlideshow;
+  if (btn) btn.textContent = '⏸';
+}
+
+export function stopSlideshow() {
+  clearInterval(slideshowTimer);
+  slideshowTimer = null;
+  const btn = els().btnSlideshow;
+  if (btn) btn.textContent = '⏵';
+}
+
+export function pauseSlideshow() {
+  slideshowPausedUntil = Date.now() + 10000;
+}
+
+export function toggleCrop() {
+  const e = els();
+  if (!e.player) return;
+  if (!document.fullscreenElement) return;
+  cropMode = !cropMode;
+  e.player.classList.toggle('crop-mode', cropMode);
+  if (!cropMode) {
+    resetCropPosition();
+  } else {
+    applyCropPosition();
+  }
+}
+
+function applyCropPosition() {
+  const e = els();
+  if (!e.player) return;
+  e.player.style.setProperty('--crop-x', cropPositionX + '%');
+  e.player.style.setProperty('--crop-y', cropPositionY + '%');
+  updateCropIndicator();
+}
+
+function updateCropIndicator() {
+  const e = els();
+  if (!e.cropIndicator) return;
+  if (!cropMode) {
+    e.cropIndicator.classList.add('hidden');
+    return;
+  }
+  const snap = 5;
+  let label = '';
+  if (Math.abs(cropPositionX - 50) <= snap && Math.abs(cropPositionY - 50) <= snap) label = 'C';
+  else if (Math.abs(cropPositionX - 50) <= snap && cropPositionY <= snap) label = 'T';
+  else if (Math.abs(cropPositionX - 50) <= snap && cropPositionY >= 95) label = 'B';
+  else if (cropPositionX <= snap && Math.abs(cropPositionY - 50) <= snap) label = 'L';
+  else if (cropPositionX >= 95 && Math.abs(cropPositionY - 50) <= snap) label = 'R';
+  else label = Math.round(cropPositionX) + ',' + Math.round(cropPositionY);
+  e.cropIndicator.textContent = label;
+  e.cropIndicator.classList.remove('hidden');
+}
+
+export function resetCropPosition() {
+  cropPositionX = 50;
+  cropPositionY = 50;
+  cropPresetIndex = 0;
+  applyCropPosition();
+}
+
+export function clearCropMode() {
+  cropMode = false;
+  const e = els();
+  e.player?.classList.remove('crop-mode');
+  resetCropPosition();
+}
+
+export function shiftCropPosition(dx, dy) {
+  if (!cropMode) return false;
+  cropPositionX = Math.max(0, Math.min(100, cropPositionX + dx));
+  cropPositionY = Math.max(0, Math.min(100, cropPositionY + dy));
+  applyCropPosition();
+  return true;
+}
+
+export function cycleCropPosition() {
+  if (!cropMode) return;
+  cropPresetIndex = (cropPresetIndex + 1) % CROP_PRESETS.length;
+  const preset = CROP_PRESETS[cropPresetIndex];
+  cropPositionX = preset.x;
+  cropPositionY = preset.y;
+  applyCropPosition();
+}