public abstract class LazyPanel extends SimplePanel
setVisible(boolean)(true) or ensureWidget() is
called.
public class LazyPanelExample implements EntryPoint {
private static class HelloLazyPanel extends LazyPanel {
@Override
protected Widget createWidget() {
return new Label("Well hello there!");
}
}
public void onModuleLoad() {
final Widget lazy = new HelloLazyPanel();
// Not strictly necessary, but keeps the empty outer div
// from effecting layout before it is of any use
lazy.setVisible(false);
PushButton b = new PushButton("Click me");
b.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
lazy.setVisible(true);
}
});
RootPanel root = RootPanel.get();
root.add(b);
root.add(lazy);
}
}
UIObject.DebugIdImpl, UIObject.DebugIdImplEnabledHasWidgets.ForIsWidgetwidgeteventsToSinkDEBUG_ID_PREFIX, MISSING_ELEMENT_ERROR, SETELEMENT_TWICE_ERROR| Constructor and Description |
|---|
LazyPanel() |
| Modifier and Type | Method and Description |
|---|---|
protected abstract Widget |
createWidget()
Create the widget contained within the
LazyPanel. |
void |
ensureWidget()
Ensures that the widget has been created by calling
createWidget()
if SimplePanel.getWidget() returns null. |
void |
setVisible(boolean visible)
Sets whether this object is visible.
|
add, getContainerElement, getWidget, iterator, remove, setWidget, setWidgetadd, adopt, clear, doAttachChildren, doDetachChildren, orphan, removeaddAttachHandler, addBitlessDomHandler, addDomHandler, addHandler, asWidget, asWidgetOrNull, createHandlerManager, delegateEvent, ensureHandlers, fireEvent, getHandlerCount, getHandlerManager, getLayoutData, getParent, isAttached, isOrWasAttached, onAttach, onBrowserEvent, onDetach, onLoad, onUnload, removeFromParent, replaceElement, setLayoutData, setParent, sinkEvents, unsinkEventsaddStyleDependentName, addStyleName, ensureDebugId, ensureDebugId, ensureDebugId, getAbsoluteLeft, getAbsoluteTop, getElement, getOffsetHeight, getOffsetWidth, getStyleElement, getStyleName, getStyleName, getStylePrimaryName, getStylePrimaryName, getTitle, isVisible, isVisible, onEnsureDebugId, removeStyleDependentName, removeStyleName, resolvePotentialElement, setElement, setElement, setHeight, setPixelSize, setSize, setStyleDependentName, setStyleName, setStyleName, setStyleName, setStyleName, setStylePrimaryName, setStylePrimaryName, setTitle, setVisible, setWidth, sinkBitlessEvent, toStringprotected abstract Widget createWidget()
LazyPanel.public void ensureWidget()
createWidget()
if SimplePanel.getWidget() returns null. Typically it is not
necessary to call this directly, as it is called as a side effect of a
setVisible(true) call.public void setVisible(boolean visible)
HasVisibilitysetVisible in interface HasVisibilitysetVisible in class UIObjectvisible - true to show the object, false to
hide it