Question

I’m using a WebView in edit mode. I have implemented this method from WebUIDelegate Procotol:

- (void)webView:(WebView *)sender willPerformDragDestinationAction:(WebDragDestinationAction)action forDraggingInfo:(id < NSDraggingInfo >)draggingInfo

and use it to catch the drops of elements on my WebView. When I detect a file being dragged from outside my app, and containing a picture, I build in this method the img DOM element and add it to my document.

This works fine, but as the method’s name implies, I am only informed that the drag will happen, and I have no control over it.

As the Finder always does file drag operation, what normally happens when dropping a file on a WebView in editing mode is the webview displays the path of the file.

I end up having the file path string added to my webview, and the image too, but I would like to prevent the text from being added.

Is there any way to configure this without subclassing webview?

I tried it and while it works, it breaks plenty of other things like caret moving for the drop and such.

Answer 1

Answering this myself for a change!

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{

    if ([sender draggingSource] == nil)
    {

        NSPasteboard *pboard = [sender draggingPasteboard];

        if ( [[pboard types] containsObject:NSFilenamesPboardType] ) {
            NSURL* fileURL;
            fileURL=[NSURL URLFromPasteboard: [sender draggingPasteboard]];

            NSArray *dragTypes = [NSArray arrayWithObject:NSFileContentsPboardType];
            [[sender draggingPasteboard] declareTypes:dragTypes owner:nil];

            NSImage *content = [[NSImage alloc] initWithContentsOfURL:fileURL];
            [[sender draggingPasteboard] setData:[content TIFFRepresentation] forType:NSPasteboardTypeTIFF];
        }
    }

    return [super performDragOperation:sender];


}

Actually, what I did was indeed to subclass the WebView and intercept the performDragOperation to change the content of the dragging pasteboard, if the dragging source is outside of my app and doesn’t contain already an image but only a filename.