add preview attached image, allow upload image from clipboard and drag & drp

client/components/cards/attachments.js

@@ -20,6 +20,39 @@ Template.attachmentsGalery.events({
   'click .js-remove-cover'() {
     Cards.findOne(this.cardId).unsetCover();
   },
+  'click .js-preview-image'(evt) {
+    Popup.open('previewAttachedImage').call(this, evt);
+    // when multiple thumbnails, if click one then another very fast, 
+    // we might get a wrong width from previous img.
+    // when popup reused, onRendered() won't be called, so we cannot get there.
+    // here make sure to get correct size when this img fully loaded.
+    const img = $('img.preview-large-image')[0];
+    if (!img) return;
+    const rePosPopup = () => {
+      const w = img.width;
+      const h = img.height;
+      // if the image is too large, we resize & center the popup.
+      if (w > 300) {
+        $('div.pop-over').css({
+          width: (w + 20),
+          position: 'absolute',
+          left: (window.innerWidth - w)/2,
+          top: (window.innerHeight - h)/2,
+        });
+      }
+    };
+    const url = $(evt.currentTarget).attr('src');
+    if (img.src === url && img.complete)
+      rePosPopup();
+    else
+      img.onload = rePosPopup;
+  },
+});
+
+Template.previewAttachedImagePopup.events({
+  'click .js-large-image-clicked'(){
+    Popup.close();
+  },
 });
 
 Template.cardAttachmentsPopup.events({
@@ -28,7 +61,7 @@ Template.cardAttachmentsPopup.events({
     FS.Utility.eachFile(evt, (f) => {
       const file = new FS.File(f);
       file.boardId = card.boardId;
-      file.cardId  = card._id;
+      file.cardId = card._id;
 
       Attachments.insert(file);
       Popup.close();
@@ -38,4 +71,48 @@ Template.cardAttachmentsPopup.events({
     tpl.find('.js-attach-file').click();
     evt.preventDefault();
   },
+  'click .js-upload-clipboard-image': Popup.open('previewClipboardImage'),
+});
+
+let pastedResults = null;
+
+Template.previewClipboardImagePopup.onRendered(() => {
+  // we can paste image from clipboard
+  $(document.body).pasteImageReader((results) => {
+    if (results.dataURL.startsWith('data:image/')) {
+      $('img.preview-clipboard-image').attr('src', results.dataURL);
+      pastedResults = results;
+    }
+  });
+
+  // we can also drag & drop image file to it
+  $(document.body).dropImageReader((results) => {
+    if (results.dataURL.startsWith('data:image/')) {
+      $('img.preview-clipboard-image').attr('src', results.dataURL);
+      pastedResults = results;
+    }
+  });
+});
+
+Template.previewClipboardImagePopup.events({
+  'click .js-upload-pasted-image'() {
+    const results = pastedResults;
+    if (results && results.file) {
+      const card = this;
+      const file = new FS.File(results.file);
+      if (!results.name) {
+        // if no filename, it's from clipboard. then we give it a name, with ext name from MIME type
+        if (typeof results.file.type === 'string') {
+          file.name(results.file.type.replace('image/', 'clipboard.'));
+        }
+      }
+      file.updatedAt(new Date());
+      file.boardId = card.boardId;
+      file.cardId = card._id;
+      Attachments.insert(file);
+      pastedResults = null;
+      $(document.body).pasteImageReader(() => {});
+      Popup.close();
+    }
+  },
 });