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POSetting a drag image in GWT 2.4
 

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    <p>I need to implement drag and drop for cells in a <code>CellTable</code>. Following the example from the <a href="http://code.google.com/p/google-web-toolkit/source/browse/releases/2.4/samples/mobilewebapp/src/main/java/com/google/gwt/sample/mobilewebapp/client/desktop/DesktopTaskEditView.java" rel="nofollow">MobileWebApp</a> I implemented a custom draggable cell:</p> <pre><code>public class DraggableCell extends AbstractCell&lt;ProductProxy&gt;{ interface Templates extends SafeHtmlTemplates { @SafeHtmlTemplates.Template("&lt;div draggable=\"true\"&gt;{0}&lt;/div&gt;") SafeHtml simpleTextTemplate(String text); } protected Templates templates = GWT.create(Templates.class); public DraggableCell() { super("dragstart"); } @Override public void render(Context context, ProductProxy value, SafeHtmlBuilder sb){ sb.append(templates.simpleTextTemplate(value.getName())); } @Override public void onBrowserEvent(Context context, Element parent, ProductProxy value, NativeEvent event, ValueUpdater&lt;ProductProxy&gt; valueUpdater) { final Integer cursorOffsetX = 0; final Integer cursorOffsetY = 0; if ("dragstart".equals(event.getType())) { // Save the ID of the entity DataTransfer dataTransfer = event.getDataTransfer(); dataTransfer.setData("text", value.getId()); SafeHtmlBuilder sb = new SafeHtmlBuilder(); sb.appendEscaped(value.getSn()); Element element = DOM.createDiv(); element.setInnerHTML(sb.toSafeHtml().asString()); // Set the helper image. dataTransfer.setDragImage(element, cursorOffsetX, cursorOffsetY); } } </code></pre> <p>I use a new element for the drag image (in the MobileWebApp they just use the parent element), but unfortunately no image is displayed during the drag. I thought that maybe the new element needs to be attached to the DOM first, so I created a helperPanel and attached the element to it:</p> <pre><code>DOM.getElementById("dragHelperPanel").appendChild(element); // Set the helper image. dataTransfer.setDragImage(element, cursorOffsetX, cursorOffsetY); </code></pre> <p>This works fine in Firefox 6, but no luck in Chrome (using the latest stable version), so maybe this isn't the right way to do it. Any ideas? Thanks!</p>
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