feat: add zoom scaling to timetable page #202

src/SEQTA.ts

@@ -753,6 +753,117 @@ async function LoadPageElements(): Promise<void> {
   await handleSublink(sublink);
 }
 
+function handleTimetableZoom(): void {
+  console.log('Initializing timetable zoom controls');
+  
+  // Lazy initialize state variables only when function is first called
+  let timetableZoomLevel = 1;
+  let baseContainerHeight: number | null = null;
+  const originalEntryPositions = new Map<Element, { topRatio: number; heightRatio: number }>();
+  
+  // Create zoom controls
+  const zoomControls = document.createElement('div');
+  zoomControls.className = 'timetable-zoom-controls';
+  
+  const zoomIn = document.createElement('button');
+  zoomIn.className = 'uiButton timetable-zoom iconFamily';
+  zoomIn.innerHTML = '&#xed93;'; // Using unicode for zoom in icon
+  
+  const zoomOut = document.createElement('button');
+  zoomOut.className = 'uiButton timetable-zoom iconFamily';
+  zoomOut.innerHTML = '&#xed94;'; // Using unicode for zoom out icon
+  
+
+  zoomControls.appendChild(zoomIn);
+  zoomControls.appendChild(zoomOut);
+
+  const toolbar = document.getElementById('toolbar');
+  toolbar?.appendChild(zoomControls);
+
+  const initializePositions = () => {
+    // Get the base container height from the first TD
+    const firstDayColumn = document.querySelector('.dailycal .content .days td') as HTMLElement;
+    if (!firstDayColumn) return false;
+    
+    baseContainerHeight = parseInt(firstDayColumn.style.height) || firstDayColumn.offsetHeight;
+
+    // Store original ratios
+    const entries = document.querySelectorAll('.entriesWrapper .entry');
+    entries.forEach((entry: Element) => {
+      const entryEl = entry as HTMLElement;
+      
+      // Calculate ratios relative to detected base height
+      if (baseContainerHeight === null) return;
+      const topRatio = parseInt(entryEl.style.top) / baseContainerHeight;
+      const heightRatio = parseInt(entryEl.style.height) / baseContainerHeight;
+      
+      originalEntryPositions.set(entry, { topRatio, heightRatio });
+    });
+
+    return true;
+  };
+
+  const updateZoom = () => {
+    // Initialize positions if not already done
+    if (baseContainerHeight === null && !initializePositions()) {
+      console.error('Failed to initialize positions');
+      return;
+    }
+
+    console.debug(`Updating zoom level to: ${timetableZoomLevel}`);
+    
+    // Calculate new container height
+    if (baseContainerHeight === null) return;
+    const newContainerHeight = baseContainerHeight * timetableZoomLevel;
+
+    // Update all day columns (TDs)
+    const dayColumns = document.querySelectorAll('.dailycal .content .days td');
+    dayColumns.forEach((td: Element) => {
+      (td as HTMLElement).style.height = `${newContainerHeight}px`;
+    });
+
+    // Update all entries using stored ratios
+    const entries = document.querySelectorAll('.entriesWrapper .entry');
+    entries.forEach((entry: Element) => {
+      const entryEl = entry as HTMLElement;
+      const originalRatios = originalEntryPositions.get(entry);
+      
+      if (originalRatios) {
+        // Calculate new positions from original ratios
+        const newTop = originalRatios.topRatio * newContainerHeight;
+        const newHeight = originalRatios.heightRatio * newContainerHeight;
+        
+        // Apply new values
+        entryEl.style.top = `${Math.round(newTop)}px`;
+        entryEl.style.height = `${Math.round(newHeight)}px`;
+      }
+    });
+
+    // Update time column to match
+    const timeColumn = document.querySelector('.times');
+    if (timeColumn) {
+      const times = timeColumn.querySelectorAll('.time');
+      const timeHeight = newContainerHeight / times.length;
+      times.forEach((time: Element) => {
+        (time as HTMLElement).style.height = `${timeHeight}px`;
+      });
+    }
+  };
+
+  zoomIn.addEventListener('click', () => {
+    if (timetableZoomLevel < 2) {
+      timetableZoomLevel += 0.2;
+      updateZoom();
+    }
+  });
+
+  zoomOut.addEventListener('click', () => {
+    if (timetableZoomLevel > 0.6) {
+      timetableZoomLevel -= 0.2;
+      updateZoom();
+    }
+  });
+}
 
 async function handleNotices(node: Element): Promise<void> {
   if (!(node instanceof HTMLElement)) return;
@@ -804,15 +915,25 @@ async function handleSublink(sublink: string | undefined): Promise<void> {
 }
 
 async function handleTimetable(): Promise<void> {
-  await waitForElm('.time', true, 10)
+  await waitForElm('.time', true, 10);
 
+  // Store original heights when timetable loads
+  const lessons = document.querySelectorAll('.dailycal .lesson');
+  lessons.forEach((lesson: Element) => {
+    const lessonEl = lesson as HTMLElement;
+    lessonEl.setAttribute('data-original-height', lessonEl.offsetHeight.toString());
+  });
+
+  // Existing time format code
   if (settingsState.timeFormat == '12') {
-    const times = document.querySelectorAll('.timetablepage .times .time')
+    const times = document.querySelectorAll('.timetablepage .times .time');
     for (const time of times) {
-      if (!time.textContent) continue
-      time.textContent = convertTo12HourFormat(time.textContent, true)
+      if (!time.textContent) continue;
+      time.textContent = convertTo12HourFormat(time.textContent, true);
     }
   }
+
+  handleTimetableZoom();
 }
 
 async function handleNewsPage(): Promise<void> {