Scale pasted images to appropriate size on HiDPI displays using devicePixelRatio (#38504).

Patch by Go MAEDA (user:maeda).


git-svn-id: https://svn.redmine.org/redmine/trunk@23344 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/assets/javascripts/attachments.js

@@ -229,15 +229,60 @@ function setupFileDrop() {
   }
 }
 
+function getImageWidth(file) {
+  return new Promise((resolve, reject) => {
+    if (file.type.startsWith("image/")) {
+      const reader = new FileReader();
+      reader.onload = function(event) {
+        const img = new Image();
+        img.onload = function() {
+          resolve(img.width);
+        };
+        img.onerror = reject;
+        img.src = event.target.result;
+      };
+      reader.onerror = reject;
+      reader.readAsDataURL(file);
+    } else {
+      resolve(0);
+    }
+  });
+}
+
+async function getInlineAttachmentMarkup(file) {
+  const sanitizedFilename = file.name.replace(/[\/\?\%\*\:\|\"\'<>\n\r]+/g, '_');
+  const inlineFilename = encodeURIComponent(sanitizedFilename)
+    .replace(/[!()]/g, function(match) { return "%" + match.charCodeAt(0).toString(16) });
+
+  const isFromClipboard = /^clipboard-\d{12}-[a-z0-9]{5}\.\w+$/.test(file.name);
+  let imageDisplayWidth;
+  if (isFromClipboard) {
+    const imageWidth = await getImageWidth(file).catch(() => 0);
+    imageDisplayWidth = Math.round(imageWidth / window.devicePixelRatio);
+  }
+  const hasValidWidth = isFromClipboard && imageDisplayWidth > 0;
+
+  switch (document.body.getAttribute('data-text-formatting')) {
+    case 'textile':
+      return hasValidWidth
+        ? `!{width: ${imageDisplayWidth}px}.${inlineFilename}!`
+        : `!${inlineFilename}!`;
+    case 'common_mark':
+      return hasValidWidth
+        ? `<img style="width: ${imageDisplayWidth}px;" src="${inlineFilename}"><br>`
+        : `![](${inlineFilename})`;
+    default:
+      // Text formatting is "none" or unknown
+      return '';
+  }
+}
+
 function addInlineAttachmentMarkup(file) {
   // insert uploaded image inline if dropped area is currently focused textarea
   if($(handleFileDropEvent.target).hasClass('wiki-edit') && $.inArray(file.type, window.wikiImageMimeTypes) > -1) {
     var $textarea = $(handleFileDropEvent.target);
     var cursorPosition = $textarea.prop('selectionStart');
     var description = $textarea.val();
-    var sanitizedFilename = file.name.replace(/[\/\?\%\*\:\|\"\'<>\n\r]+/, '_');
-    var inlineFilename = encodeURIComponent(sanitizedFilename)
-      .replace(/[!()]/g, function(match) { return "%" + match.charCodeAt(0).toString(16) });
     var newLineBefore = true;
     var newLineAfter = true;
     if(cursorPosition === 0 || description.substr(cursorPosition-1,1).match(/\r|\n/)) {
@@ -247,20 +292,16 @@ function addInlineAttachmentMarkup(file) {
       newLineAfter = false;
     }
 
-    $textarea.val(
-      description.substring(0, cursorPosition)
-      + (newLineBefore ? '\n' : '')
-      + inlineFilename
-      + (newLineAfter ? '\n' : '')
-      + description.substring(cursorPosition, description.length)
-    );
-
-    $textarea.prop({
-      'selectionStart': cursorPosition + newLineBefore,
-      'selectionEnd': cursorPosition + inlineFilename.length + newLineBefore
-    });
-    $textarea.parents('.jstBlock')
-      .find('.jstb_img').click();
+    getInlineAttachmentMarkup(file)
+      .then(imageMarkup => {
+        $textarea.val(
+          description.substring(0, cursorPosition)
+          + (newLineBefore ? '\n' : '')
+          + imageMarkup
+          + (newLineAfter ? '\n' : '')
+          + description.substring(cursorPosition, description.length)
+        );
+      })
 
     // move cursor into next line
     cursorPosition = $textarea.prop('selectionStart');