fix for dropdowns not working.

2025-12-06 06:17:17 +00:00 · 2021-04-29 21:53:01 +01:00
parent 3f8a41504f
commit c8ffb55bbe
13 changed files with 369 additions and 370 deletions
--- a/static/js/read_comic_pdf.js
+++ b/static/js/read_comic_pdf.js
@@ -0,0 +1,146 @@
+// If absolute URL from the remote server is provided, configure the CORS
+// header on that server.
+const nav = JSON.parse(document.getElementById('nav').textContent);
+const last_read_page = JSON.parse(document.getElementById('last_read_page').textContent);
+var url = "/comic/read/" + nav.cur_path + "/pdf"
+
+// Loaded via <script> tag, create shortcut to access PDF.js exports.
+var pdfjsLib = window['pdfjs-dist/build/pdf'];
+
+
+// The workerSrc property shall be specified.
+pdfjsLib.GlobalWorkerOptions.workerSrc = '/static/pdfjs/build/pdf.worker.js';
+
+var pdfDoc = null,
+    pageNum = last_read_page,
+    pageRendering = false,
+    pageNumPending = null,
+    scale = 0.8,
+    canvas = document.getElementById('the-canvas'),
+    ctx = canvas.getContext('2d');
+
+/**
+ * Get page info from document, resize canvas accordingly, and render page.
+ * @param num Page number.
+ */
+function renderPage(num) {
+  pageRendering = true;
+  // Using promise to fetch the page
+  pdfDoc.getPage(num).then(function(page) {
+    let viewport = page.getViewport({scale: (window.innerWidth *.95) / page.getViewport({scale:1.0}).width});
+    canvas.height = viewport.height;
+    canvas.width = viewport.width;
+
+    // Render PDF page into canvas context
+    let renderContext = {
+      canvasContext: ctx,
+      viewport: viewport
+    };
+    let renderTask = page.render(renderContext);
+
+    // Wait for rendering to finish
+    renderTask.promise.then(function() {
+      pageRendering = false;
+      if (pageNumPending !== null) {
+        // New page rendering is pending
+        renderPage(pageNumPending);
+        pageNumPending = null;
+      }
+    }).then(function () {
+        document.getElementById('the-canvas').scrollIntoView({behavior: 'smooth'})
+        $.ajax({url: "/comic/set_page/" + nav.cur_path + "/" + (num-1) + "/"})
+    });
+  });
+
+  // Update page counters
+  document.getElementById('page_num').textContent = num;
+}
+
+/**
+ * If another page rendering in progress, waits until the rendering is
+ * finised. Otherwise, executes rendering immediately.
+ */
+function queueRenderPage(num) {
+  if (pageRendering) {
+    pageNumPending = num;
+  } else {
+    renderPage(num);
+  }
+}
+
+/**
+ * Displays previous page.
+ */
+function onPrevPage() {
+  if (pageNum <= 1) {
+    window.location = "/comic/read/"+ nav.prev_path +"/"
+  }
+  pageNum--;
+  queueRenderPage(pageNum);
+}
+document.getElementById('prev').addEventListener('click', onPrevPage);
+
+/**
+ * Displays next page.
+ */
+function onNextPage() {
+  if (pageNum >= pdfDoc.numPages) {
+    window.location = "/comic/read/"+ nav.next_path +"/"
+  }
+  pageNum++;
+  queueRenderPage(pageNum);
+}
+document.getElementById('next').addEventListener('click', onNextPage);
+
+/**
+ * Asynchronously downloads PDF.
+ */
+pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) {
+  pdfDoc = pdfDoc_;
+  document.getElementById('page_count').textContent = pdfDoc.numPages;
+
+  // Initial/first page rendering
+  renderPage(pageNum);
+});
+
+$(document).keydown(function(e) { // add arrow key support
+    switch(e.which) {
+        case 37: // left
+            onPrevPage()
+        break;
+
+        case 38: // up
+            window.scrollTo({
+              top: window.scrollY-window.innerHeight*.7,
+              left: 0,
+              behavior: 'smooth'
+            });
+        break;
+
+        case 39: // right
+            onNextPage()
+        break;
+
+        case 40: // down
+            window.scrollTo({
+              top: window.scrollY+window.innerHeight*.7,
+              left: 0,
+              behavior: 'smooth'
+            });
+        break;
+
+        default: return; // exit this handler for other keys
+    }
+    e.preventDefault(); // prevent the default action (scroll / move caret)
+});
+
+var hammertime = new Hammer(document.getElementById('the-canvas'), {});
+hammertime.on('swipeleft', function () {
+    onNextPage()
+})
+hammertime.on('swiperight', function () {
+    onPrevPage()
+})
+hammertime.on('tap', function () {
+    onNextPage()
+})