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Editorial Team
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Asked: 2026-06-10T23:15:56+00:00

I’m trying to get a draggable image in Dart. Though setting the draggable bool

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I’m trying to get a draggable image in Dart. Though setting the draggable bool of my image doesn’t work.

image = new ImageElement();
image.src = ImageSourceByName(name);
image.on.load.add((event) {Context.drawImage(image, 10, 10, CARD_SMALL_WIDTH, CARD_SMALL_HEIGHT);});
image.draggable = true;

(Note: Context is the 2D context I get from my Canvas.)

The drawing works perfectly, I can see my card, though I can’t drag it around. I’m pretty new to Dart, so it might be something obvious, though I can’t find any tutorial explaining it.

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1 Answer

  1. Editorial Team

    You’re using an ImageElement as the source to paint something on your CanvasElement.
    Once the pixels are on the canvas(through drawImage()), your image data is not an HTMLElement but, well, pixels 🙂

    The draggable attr, however, is an attribute of an HTMLElement.
    If you add the image to your document, you’ll notice that you can study the behaviour of draggable, like this:
    document.body.nodes.add(image);

    If you ‘only’ want to have draggable images, you can take it from there and maybe look at http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html
    Otherwise, if you want stuff on a canvas to be draggable, thats a different(more complicated?) story.

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