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Prevent the default browser behaviour for dropped files from running #43493

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merged 4 commits into from
Sep 8, 2022

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glendaviesnz
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@glendaviesnz glendaviesnz commented Aug 22, 2022

What?

Prevents the default browse actions from running (usually opens file in a new window) if a file is dropped outside of editor dropzones.

As a follow-on to this it would be good to extend the existing dropzones within the canvas so dropping creates blocks in a wider range of areas, and this prevention of the behaviour only kicks in when dropped in obvious error spots like the top toolbar.

Why?

It is unlikely that a user will ever be expecting a file dropped in the editor window to open that file in a new tab, and doing so is disruptive to the editing workflow.

How?

Adds drop and dragover event listeners to the window to prevent the default action on these events that bubble up past valid drop zones.

Testing Instructions

  • Open the post editor
  • Try dragging and dropping files outside of the normal dropzones and make sure the files are not opened in new tab
  • Try dragging and dropping files into the normal editor dropzones and make sure it works as expected

Screenshots or screencast

Before:

drag-drop-before.mp4

After:

drag-after.mp4

@glendaviesnz glendaviesnz added [Type] Bug An existing feature does not function as intended [Feature] Drag and Drop Drag and drop functionality when working with blocks labels Aug 22, 2022
@glendaviesnz glendaviesnz self-assigned this Aug 22, 2022
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github-actions bot commented Aug 22, 2022

Size Change: +125 B (0%)

Total Size: 1.25 MB

Filename Size Change
build/block-editor/index.min.js 162 kB +58 B (0%)
build/edit-post/index.min.js 30.7 kB +31 B (0%)
build/edit-site/index.min.js 58.3 kB +36 B (0%)
ℹ️ View Unchanged
Filename Size
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@ramonjd ramonjd left a comment

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In the post editor:

✅ can drag/update/add on image, media and text, gallery, cover and video blocks
✅ can drag/add on the inserter in a post (to add an image between blocks for example)
✅ can drag/add in media library
✅ cannot drag onto the document anywhere else

Do we need a follow up for the site editor frames?

@glendaviesnz
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Do we need a follow up for the site editor frames?

Good point, have pushed a change for this to this PR, might as well cover it off in one PR.

@talldan with your experience with drag and drop can you see any issues with preventing the browser default at the top level of editors this way?

@glendaviesnz
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Do we need a follow up for the site editor frames?
Good point, have pushed a change for this to this PR,

actually that change only works in top level site editor, not the likes of the focused editing of header, etc. so don't bother testing until I have taken another look.

@talldan
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talldan commented Aug 23, 2022

@talldan with your experience with drag and drop can you see any issues with preventing the browser default at the top level of editors this way?

I'm not sure. I don't think so.

It'd be interesting to know whether the post editor previously had a way to prevent this happening. My feeling is that it probably did, but perhaps it was removed somewhere down the line.

@talldan
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talldan commented Aug 23, 2022

I had a quick look and I think this would have been prevented previously by the editor being wrapped in DropZoneProvider:

return (
<StrictMode>
<SlotFillProvider>
<DropZoneProvider>
<EditorProvider
settings={ editorSettings }
post={ post }
initialEdits={ initialEdits }
useSubRegistry={ false }
{ ...props }
>
<ErrorBoundary onError={ onError }>
<Layout />
<KeyboardShortcuts shortcuts={ preventEventDiscovery } />
</ErrorBoundary>
<PostLockedModal />
</EditorProvider>
</DropZoneProvider>
</SlotFillProvider>
</StrictMode>
);

That called preventDefault:

onDragOver( event ) {
this.toggleDraggingOverDocument( event, getDragEventType( event ) );
event.preventDefault();
}
onDrop( event ) {
// This seemingly useless line has been shown to resolve a Safari issue
// where files dragged directly from the dock are not recognized
event.dataTransfer && event.dataTransfer.files.length; // eslint-disable-line no-unused-expressions
const { position, hoveredDropZone } = this.state;
const dragEventType = getDragEventType( event );
const dropZone = this.dropZones[ hoveredDropZone ];
this.resetDragState();
if ( dropZone ) {
switch ( dragEventType ) {
case 'file':
dropZone.onFilesDrop( [ ...event.dataTransfer.files ], position );
break;
case 'html':
dropZone.onHTMLDrop( event.dataTransfer.getData( 'text/html' ), position );
break;
case 'default':
dropZone.onDrop( event, position );
}
}
event.stopPropagation();
event.preventDefault();
}

At some point in the past DropZoneProvider was removed, and that might be when the regression happened.

@glendaviesnz
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thanks for the extra detail @talldan - in my memory it seemed like it had always done that, so handy to know it is a regression.

@glendaviesnz
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... just trying to work out where these event listeners can be added in way that is not going to end up with duplicate event listeners, particularly in site editor

@apeatling
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This is going to make a big difference, I've been running into this often.

@glendaviesnz glendaviesnz requested a review from ellatrix as a code owner August 24, 2022 01:09
@@ -195,9 +195,15 @@ function Iframe(
const clearerRef = useBlockSelectionClearer();
const [ before, writingFlowRef, after ] = useWritingFlow();
const setRef = useRefEffect( ( node ) => {
let iFrameDocument;
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This part is a bit messy, but the event listeners didn't seem to work if just attached to node, so had to add to the iframes contentDocument once loaded, but then need access to that doc outside the onload method in order to remove the event listeners as this code is instantiated numerous times while using the site editor ... probably the event handlers are disposed of when the iframe doc is unmounted anyway - not sure 🤔

@@ -177,6 +177,10 @@ export function initializeEditor(
} );
}

// Prevent the default browser action for files dropped outside of dropzones.
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this code, and the same in the edit site file below in my testing is only ever executed once on editor load, so I don't think we need to try and tidy up these event listeners.

@glendaviesnz
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@ramonjd I think I have it working in all the editor instances in the site editor now also. To test the iframed version try editing the header for footer in isolation in the site editor

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ramonjd commented Aug 25, 2022

Tested in the site editor on page and individual templates.

Things are working as expected. I can drag on dropzones but nowhere else.

Thanks @glendaviesnz !

@glendaviesnz glendaviesnz force-pushed the fix/default-drop-behaviour branch from 59e68b1 to bf6ad6f Compare September 6, 2022 23:55
@glendaviesnz glendaviesnz force-pushed the fix/default-drop-behaviour branch from bf6ad6f to 005add4 Compare September 8, 2022 02:38
@glendaviesnz
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@ramonjd I had to rebase this due to some minor conflicts, they were pretty straight forward to resolve, but another quick test probably wouldn't hurt when you have a minute.

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ramonjd commented Sep 8, 2022

Retested

LGTM! 🎉

@glendaviesnz glendaviesnz merged commit 88dc79e into trunk Sep 8, 2022
@glendaviesnz glendaviesnz deleted the fix/default-drop-behaviour branch September 8, 2022 04:28
@github-actions github-actions bot added this to the Gutenberg 14.1 milestone Sep 8, 2022
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mtias commented Sep 19, 2022

This is great, but we should consider opening an issue to improve what could happen when you drop a file and it's not handled by a dropzone. For example, we can ask the user in a modal, "where do you want to add the image?"

  • To the media library
  • At the end of the post
  • As the featured image

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Another thing we could try (in addition to @mtias suggestion) is to highlight the drop area with a border, reinforcing the fact that it accepts items:

gray.mov
blue.mov

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Labels
[Feature] Drag and Drop Drag and drop functionality when working with blocks Needs User Documentation Needs new user documentation [Type] Bug An existing feature does not function as intended
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7 participants