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java.lang.Objectcom.google.gwt.user.client.ui.UIObject
com.google.gwt.user.client.ui.Widget
com.google.gwt.user.client.ui.Panel
com.google.gwt.user.client.ui.SimplePanel
com.google.gwt.user.client.ui.LazyPanel
public abstract class LazyPanel
Convenience class to help lazy loading. The bulk of a LazyPanel is not
instantiated until 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);
}
}
| Nested Class Summary |
|---|
| Nested classes/interfaces inherited from class com.google.gwt.user.client.ui.UIObject |
|---|
UIObject.DebugIdImpl, UIObject.DebugIdImplEnabled |
| Nested classes/interfaces inherited from interface com.google.gwt.user.client.ui.HasWidgets |
|---|
HasWidgets.ForIsWidget |
| Field Summary |
|---|
| Fields inherited from class com.google.gwt.user.client.ui.SimplePanel |
|---|
widget |
| Fields inherited from class com.google.gwt.user.client.ui.Widget |
|---|
eventsToSink |
| Fields inherited from class com.google.gwt.user.client.ui.UIObject |
|---|
DEBUG_ID_PREFIX, MISSING_ELEMENT_ERROR, SETELEMENT_TWICE_ERROR |
| Constructor Summary | |
|---|---|
LazyPanel()
|
|
| Method Summary | |
|---|---|
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. |
| Methods inherited from class com.google.gwt.user.client.ui.SimplePanel |
|---|
add, getContainerElement, getWidget, iterator, remove, setWidget, setWidget |
| Methods inherited from class com.google.gwt.user.client.ui.Panel |
|---|
add, adopt, clear, doAttachChildren, doDetachChildren, orphan, remove |
| Methods inherited from class com.google.gwt.user.client.ui.Widget |
|---|
addAttachHandler, 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, unsinkEvents |
| Methods inherited from class com.google.gwt.user.client.ui.UIObject |
|---|
addStyleDependentName, 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, toString |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Constructor Detail |
|---|
public LazyPanel()
| Method Detail |
|---|
protected 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)
HasVisibility
setVisible in interface HasVisibilitysetVisible in class UIObjectvisible - true to show the object, false to
hide it
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