Google Web Toolkit
DialogBox
public class PopupPanelExample implements EntryPoint {
private static class MyPopup extends PopupPanel {
public MyPopup() {
// PopupPanel's constructor takes 'auto-hide' as its boolean parameter.
// If this is set, the panel closes itself automatically when the user
// clicks outside of it.
super(true);
// PopupPanel is a SimplePanel, so you have to set it's widget property to
// whatever you want its contents to be.
setWidget(new Label("Click outside of this popup to close it"));
}
}
public void onModuleLoad() {
Button b1 = new Button("Click me to show popup");
b1.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
// Instantiate the popup and show it.
new MyPopup().show();
}
});
RootPanel.get().add(b1);
Button b2 = new Button("Click me to show popup partway across the screen");
b2.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
// Create the new popup.
final MyPopup popup = new MyPopup();
// Position the popup 1/3rd of the way down and across the screen, and
// show the popup. Since the position calculation is based on the
// offsetWidth and offsetHeight of the popup, you have to use the
// setPopupPositionAndShow(callback) method. The alternative would
// be to call show(), calculate the left and top positions, and
// call setPopupPosition(left, top). This would have the ugly side
// effect of the popup jumping from its original position to its
// new position.
popup.setPopupPositionAndShow(new PopupPanel.PositionCallback() {
public void setPosition(int offsetWidth, int offsetHeight) {
int left = (Window.getClientWidth() - offsetWidth) / 3;
int top = (Window.getClientHeight() - offsetHeight) / 3;
popup.setPopupPosition(left, top);
}
});
}
});
RootPanel.get().add(b2);
}
}
| PopupPanel.PositionCallback | A callback that is used to set the position of a PopupPanel right before it is shown. |
| PopupPanel() | Creates an empty popup panel. |
| PopupPanel(boolean) | Creates an empty popup panel, specifying its "auto-hide" property. |
| PopupPanel(boolean, boolean) | Creates an empty popup panel, specifying its "auto-hide" property. |
| addPopupListener(PopupListener) | Adds a listener interface to receive popup events. |
| center() | Centers the popup in the browser window and shows it. |
| getContainerElement() | Override this method to specify that an element other than the root element be the container for the panel's child widget. |
| getOffsetHeight() | Gets the panel's offset height in pixels. |
| getOffsetWidth() | Gets the panel's offset width in pixels. |
| getPopupLeft() | Gets the popup's left position relative to the browser's client area. |
| getPopupTop() | Gets the popup's top position relative to the browser's client area. |
| getStyleElement() | Template method that returns the element to which style names will be applied. |
| getTitle() | Gets the title associated with this object. |
| hide() | Hides the popup. |
| onDetach() | This method is called when a widget is detached from the browser's document. |
| onEventPreview(Event) | Called when a browser event occurs and this event preview is on top of the preview stack. |
| onKeyDownPreview(char, int) | Popups get an opportunity to preview keyboard events before they are passed to a widget contained by the Popup. |
| onKeyPressPreview(char, int) | Popups get an opportunity to preview keyboard events before they are passed to a widget contained by the Popup. |
| onKeyUpPreview(char, int) | Popups get an opportunity to preview keyboard events before they are passed to a widget contained by the Popup. |
| removePopupListener(PopupListener) | Removes a previously added popup listener. |
| setHeight(String) | Sets the height of the panel's child widget. |
| setPopupPosition(int, int) | Sets the popup's position relative to the browser's client area. |
| setPopupPositionAndShow(PopupPanel.PositionCallback) | Sets the popup's position using a PositionCallback, and shows the popup. |
| setTitle(String) | Sets the title associated with this object. |
| setVisible(boolean) | Sets whether this object is visible. |
| setWidget(Widget) | Sets this panel's widget. |
| setWidth(String) | Sets the width of the panel's child widget. |
| show() | Shows the popup. |
true if the popup should be automatically
hidden when the user clicks outside of ittrue if the popup should be automatically
hidden when the user clicks outside of ittrue if keyboard or mouse events that do not
target the PopupPanel or its children should be ignoredfalse to cancel the eventfalse to suppress the eventfalse to suppress the eventfalse to suppress the eventtrue to show the object, false
to hide itnull to clear the panel