以下是使用此处的拖放库时:
http://code.google.com/p/gwt-dnd/
将绝对面板放置在相对面板中时,似乎禁用了拖动功能。一个简单的例子:
private AbsolutePanel leftPanelTree = new AbsolutePanel();
private HorizontalPanel drawingAppPanel = new HorizontalPanel();
private VerticalPanel leftPanel = new VerticalPanel();
private VerticalPanel rightPanel = new VerticalPanel();
private Label rightSideFiller = new Label("Right Side");
private Label leftSideFiller = new Label("Left Side");
private Image newImage = new Image("images/link.gif");
private PickupDragController newDragController =
new PickupDragController(leftPanelTree, true);
public DrawingApplication() {
initWidget(drawingAppPanel);
newDragController.makeDraggable(newImage);
leftPanelTree.setWidth("300px");
leftPanelTree.setHeight("200px");
leftPanelTree.addStyleName("panelBorderTest");
leftPanelTree.add(newImage, 1, 1);
drawingAppPanel.setWidth("100%");
drawingAppPanel.setHeight("100%");
drawingAppPanel.setBorderWidth(2);
drawingAppPanel.add(leftPanel);
drawingAppPanel.add(rightPanel);
leftPanel.setBorderWidth(2);
leftPanel.setHeight("100%");
leftPanel.setWidth("100%");
leftPanel.add(leftSideFiller);
//leftPanel.add(leftPanelTree);
rightPanel.add(rightSideFiller);
}
但是,如果我将图像添加到 RootPanel(并相应地更改边界面板)或将绝对面板直接添加到 RootPanel,则拖动功能起作用。我在这里错过了什么吗?