/* (non-Javadoc)
* @see fi.jasoft.dragdroplayouts.drophandlers.DefaultCssLayoutDropHandler#handleComponentReordering(com.vaadin.event.dd.DragAndDropEvent)
*/
@Override
protected void handleComponentReordering(DragAndDropEvent event) {
LayoutBoundTransferable transferable = (LayoutBoundTransferable) event.getTransferable();
CssLayoutTargetDetails details = (CssLayoutTargetDetails) event.getTargetDetails();
// Get the components
DDCssLayout layout = (DDCssLayout) details.getTarget();
Component comp = transferable.getComponent();
Component over = details.getOverComponent();
if (over == comp) {
// If the component and the target are the same, ignore the
// drag, the component was released "on itself" so no
// reordering is required.
return;
}
// We are using a CSS layout with float:left; we only care about
// horizontal positioning
HorizontalDropLocation horizontalDropLocation = details.getHorizontalDropLocation();
// Detach - remove current component first, then calculate index.
layout.removeComponent(comp);
int indexOfDropTarget = layout.getComponentIndex(over);
// The layout has the component on top of which the drop occurred
if (indexOfDropTarget > -1) {
// If drop location is to the LEFT, add component before
if (HorizontalDropLocation.LEFT.equals(horizontalDropLocation)
|| HorizontalDropLocation.CENTER.equals(horizontalDropLocation)) {
layout.addComponent(comp, indexOfDropTarget);
} else {
// If drop target is RIGHT, add after
indexOfDropTarget++;
if (indexOfDropTarget < layout.getComponentCount()) {
layout.addComponent(comp, indexOfDropTarget);
} else {
layout.addComponent(comp);
}
}
} else {
// The current layout doesn't have the component on top of which
// it was dropped, most likely the drop was on the underlying
// layout itself. In this case we could look at the vertical
// drop position to determine if we should add the component at
// the top or the bottom in the layout.
layout.addComponent(comp);
// The else could be left out if we want to force the user to
// drop the component on another component, i.e. dropping on
// layout is not supported.
}
}
/* (non-Javadoc)
* @see fi.jasoft.dragdroplayouts.DDCssLayout#paintContent(com.vaadin.server.PaintTarget)
*/
@Override
public void paintContent(PaintTarget target) throws PaintException {
super.paintContent(target);
// Override paintContent (vaadin serialization api) to set the
// horizontal drop ratio to 50% so that we don't have a "CENTER"
// position to drop things. See
// VDDCssLayout#getHorizontalDropLocation() and
// VDDCssLayout#handleCellDropRatioUpdate() for details
target.addAttribute(Constants.ATTRIBUTE_HORIZONTAL_DROP_RATIO, 0.5f);
}
