/**
* Copyright 2011 ArcBees Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.gwtplatform.mvp.client;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.web.bindery.event.shared.EventBus;
import com.google.web.bindery.event.shared.HandlerRegistration;
import com.gwtplatform.mvp.client.proxy.NavigationEvent;
import com.gwtplatform.mvp.client.proxy.NavigationHandler;
/**
* A simple implementation of {@link PopupView} that can be used when the widget
* returned by {@link #asWidget()} inherits from {@link PopupPanel}.
* <p/>
* Also, this implementation simply disregards every call to
* {@link #setInSlot(Object, com.google.gwt.user.client.ui.IsWidget)}, {@link #addToSlot(Object,
* com.google.gwt.user.client.ui.IsWidget)}, and
* {@link #removeFromSlot(Object, com.google.gwt.user.client.ui.IsWidget)}.
*/
public abstract class PopupViewImpl extends ViewImpl implements PopupView {
private HandlerRegistration autoHideHandler;
private HandlerRegistration closeHandlerRegistration;
private final EventBus eventBus;
/**
* The {@link PopupViewImpl} class uses the {@link EventBus} to listen to
* {@link NavigationEvent} in order to automatically close when this event is
* fired, if desired. See
* {@link #setAutoHideOnNavigationEventEnabled(boolean)} for details.
*
* @param eventBus The {@link EventBus}.
*/
protected PopupViewImpl(EventBus eventBus) {
this.eventBus = eventBus;
}
@Override
public void center() {
doCenter();
// We center again in a deferred command to solve a bug in IE where newly
// created window are sometimes not centered.
Scheduler.get().scheduleDeferred(new Command() {
@Override
public void execute() {
doCenter();
}
});
}
@Override
public void hide() {
asPopupPanel().hide();
}
@Override
public void setAutoHideOnNavigationEventEnabled(boolean autoHide) {
if (autoHide) {
if (autoHideHandler != null) {
return;
}
autoHideHandler = eventBus.addHandler(NavigationEvent.getType(),
new NavigationHandler() {
@Override
public void onNavigation(NavigationEvent navigationEvent) {
hide();
}
});
} else {
if (autoHideHandler != null) {
autoHideHandler.removeHandler();
}
}
}
@Override
public void setCloseHandler(final PopupViewCloseHandler popupViewCloseHandler) {
if (closeHandlerRegistration != null) {
closeHandlerRegistration.removeHandler();
}
if (popupViewCloseHandler == null) {
closeHandlerRegistration = null;
} else {
closeHandlerRegistration = asPopupPanel().addCloseHandler(
new CloseHandler<PopupPanel>() {
@Override
public void onClose(CloseEvent<PopupPanel> event) {
popupViewCloseHandler.onClose();
}
});
}
}
@Override
public void setPosition(int left, int top) {
asPopupPanel().setPopupPosition(left, top);
}
@Override
public void show() {
asPopupPanel().show();
}
/**
* Retrieves this view as a {@link PopupPanel}. See {@link #asWidget()}.
*
* @return This view as a {@link PopupPanel} object.
*/
protected PopupPanel asPopupPanel() {
return (PopupPanel) asWidget();
}
/**
* This method centers the popup panel, temporarily making it visible if
* needed.
*/
private void doCenter() {
// We can't use Element.center() method as it will show the popup
// by default and not only centering it. This is resulting in onAttach()
// being called twice when using setInSlot() or addToPopupSlot() in PresenterWidget
// If left/top are set from a previous doCenter() call, and our content
// has changed, we may get a bogus getOffsetWidth because our new content
// is wrapping (giving a lower offset width) then it would without the
// previous left. Clearing left/top to avoids this.
PopupPanel popup = asPopupPanel();
Element elem = popup.getElement();
elem.getStyle().clearLeft();
elem.getStyle().clearTop();
int left = (Window.getClientWidth() - popup.getOffsetWidth()) >> 1;
int top = (Window.getClientHeight() - popup.getOffsetHeight()) >> 1;
popup.setPopupPosition(Math.max(Window.getScrollLeft() + left, 0), Math.max(
Window.getScrollTop() + top, 0));
}
}