/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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.vaadin.client.ui;
import java.util.ArrayList;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.HasScrollHandlers;
import com.google.gwt.event.dom.client.ScrollEvent;
import com.google.gwt.event.dom.client.ScrollHandler;
import com.google.gwt.event.logical.shared.HasResizeHandlers;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.History;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.SimplePanel;
import com.vaadin.client.ApplicationConnection;
import com.vaadin.client.BrowserInfo;
import com.vaadin.client.ComponentConnector;
import com.vaadin.client.ConnectorMap;
import com.vaadin.client.Focusable;
import com.vaadin.client.LayoutManager;
import com.vaadin.client.Profiler;
import com.vaadin.client.Util;
import com.vaadin.client.VConsole;
import com.vaadin.client.ui.ShortcutActionHandler.ShortcutActionHandlerOwner;
import com.vaadin.client.ui.TouchScrollDelegate.TouchScrollHandler;
import com.vaadin.client.ui.ui.UIConnector;
import com.vaadin.shared.ApplicationConstants;
import com.vaadin.shared.ui.ui.UIConstants;
/**
*
*/
public class VUI extends SimplePanel implements ResizeHandler,
Window.ClosingHandler, ShortcutActionHandlerOwner, Focusable,
com.google.gwt.user.client.ui.Focusable, HasResizeHandlers,
HasScrollHandlers {
private static int MONITOR_PARENT_TIMER_INTERVAL = 1000;
/** For internal use only. May be removed or replaced in the future. */
public String id;
/** For internal use only. May be removed or replaced in the future. */
public ShortcutActionHandler actionHandler;
/*
* Last known window size used to detect whether VView should be layouted
* again. Detection must check window size, because the VView size might be
* fixed and thus not automatically adapt to changed window sizes.
*/
private int windowWidth;
private int windowHeight;
/*
* Last know view size used to detect whether new dimensions should be sent
* to the server.
*/
private int viewWidth;
private int viewHeight;
/** For internal use only. May be removed or replaced in the future. */
public ApplicationConnection connection;
/**
* Keep track of possible parent size changes when an embedded application.
*
* Uses {@link #parentWidth} and {@link #parentHeight} as an optimization to
* keep track of when there is a real change.
*/
private Timer resizeTimer;
/** stored width of parent for embedded application auto-resize */
private int parentWidth;
/** stored height of parent for embedded application auto-resize */
private int parentHeight;
/** For internal use only. May be removed or replaced in the future. */
public boolean immediate;
/** For internal use only. May be removed or replaced in the future. */
public boolean resizeLazy = false;
private HandlerRegistration historyHandlerRegistration;
private TouchScrollHandler touchScrollHandler;
/**
* The current URI fragment, used to avoid sending updates if nothing has
* changed.
* <p>
* For internal use only. May be removed or replaced in the future.
*/
public String currentFragment;
/**
* Listener for URI fragment changes. Notifies the server of the new value
* whenever the value changes.
*/
private final ValueChangeHandler<String> historyChangeHandler = new ValueChangeHandler<String>() {
@Override
public void onValueChange(ValueChangeEvent<String> event) {
String newFragment = event.getValue();
// Send the location to the server if the fragment has changed
// and flush active connectors in UI.
if (!newFragment.equals(currentFragment) && connection != null) {
/*
* Ensure the fragment is properly encoded in all browsers
* (#10769)
*
* createUrlBuilder does not properly pass an empty fragment to
* UrlBuilder on Webkit browsers so do it manually (#11686)
*/
String location = Window.Location
.createUrlBuilder()
.setHash(
URL.decodeQueryString(Window.Location.getHash()))
.buildString();
currentFragment = newFragment;
connection.flushActiveConnector();
connection.updateVariable(id, UIConstants.LOCATION_VARIABLE,
location, true);
}
}
};
private VLazyExecutor delayedResizeExecutor = new VLazyExecutor(200,
new ScheduledCommand() {
@Override
public void execute() {
performSizeCheck();
}
});
private Element storedFocus;
public VUI() {
super();
// Allow focusing the view by using the focus() method, the view
// should not be in the document focus flow
getElement().setTabIndex(-1);
makeScrollable();
}
/**
* Start to periodically monitor for parent element resizes if embedded
* application (e.g. portlet).
*/
@Override
protected void onLoad() {
super.onLoad();
if (isMonitoringParentSize()) {
resizeTimer = new Timer() {
@Override
public void run() {
// trigger check to see if parent size has changed,
// recalculate layouts
performSizeCheck();
resizeTimer.schedule(MONITOR_PARENT_TIMER_INTERVAL);
}
};
resizeTimer.schedule(MONITOR_PARENT_TIMER_INTERVAL);
}
}
@Override
protected void onAttach() {
super.onAttach();
historyHandlerRegistration = History
.addValueChangeHandler(historyChangeHandler);
currentFragment = History.getToken();
}
@Override
protected void onDetach() {
super.onDetach();
historyHandlerRegistration.removeHandler();
historyHandlerRegistration = null;
}
/**
* Stop monitoring for parent element resizes.
*/
@Override
protected void onUnload() {
if (resizeTimer != null) {
resizeTimer.cancel();
resizeTimer = null;
}
super.onUnload();
}
/**
* Called when the window or parent div might have been resized.
*
* This immediately checks the sizes of the window and the parent div (if
* monitoring it) and triggers layout recalculation if they have changed.
*/
protected void performSizeCheck() {
windowSizeMaybeChanged(Window.getClientWidth(),
Window.getClientHeight());
}
/**
* Called when the window or parent div might have been resized.
*
* This immediately checks the sizes of the window and the parent div (if
* monitoring it) and triggers layout recalculation if they have changed.
*
* @param newWindowWidth
* The new width of the window
* @param newWindowHeight
* The new height of the window
*
* @deprecated use {@link #performSizeCheck()}
*/
@Deprecated
protected void windowSizeMaybeChanged(int newWindowWidth,
int newWindowHeight) {
if (connection == null) {
// Connection is null if the timer fires before the first UIDL
// update
return;
}
boolean changed = false;
ComponentConnector connector = ConnectorMap.get(connection)
.getConnector(this);
if (windowWidth != newWindowWidth) {
windowWidth = newWindowWidth;
changed = true;
connector.getLayoutManager().reportOuterWidth(connector,
newWindowWidth);
VConsole.log("New window width: " + windowWidth);
}
if (windowHeight != newWindowHeight) {
windowHeight = newWindowHeight;
changed = true;
connector.getLayoutManager().reportOuterHeight(connector,
newWindowHeight);
VConsole.log("New window height: " + windowHeight);
}
Element parentElement = getElement().getParentElement();
if (isMonitoringParentSize() && parentElement != null) {
// check also for parent size changes
int newParentWidth = parentElement.getClientWidth();
int newParentHeight = parentElement.getClientHeight();
if (parentWidth != newParentWidth) {
parentWidth = newParentWidth;
changed = true;
VConsole.log("New parent width: " + parentWidth);
}
if (parentHeight != newParentHeight) {
parentHeight = newParentHeight;
changed = true;
VConsole.log("New parent height: " + parentHeight);
}
}
if (changed) {
/*
* If the window size has changed, layout the VView again and send
* new size to the server if the size changed. (Just checking VView
* size would cause us to ignore cases when a relatively sized VView
* should shrink as the content's size is fixed and would thus not
* automatically shrink.)
*/
VConsole.log("Running layout functions due to window or parent resize");
// update size to avoid (most) redundant re-layout passes
// there can still be an extra layout recalculation if webkit
// overflow fix updates the size in a deferred block
if (isMonitoringParentSize() && parentElement != null) {
parentWidth = parentElement.getClientWidth();
parentHeight = parentElement.getClientHeight();
}
sendClientResized();
LayoutManager layoutManager = connector.getLayoutManager();
if (layoutManager.isLayoutRunning()) {
layoutManager.layoutLater();
} else {
layoutManager.layoutNow();
}
}
}
/**
* @return the name of the theme in use by this UI.
* @deprecated as of 7.3. Use {@link UIConnector#getActiveTheme()} instead.
*/
@Deprecated
public String getTheme() {
return ((UIConnector) ConnectorMap.get(connection).getConnector(this))
.getActiveTheme();
}
/**
* Returns true if the body is NOT generated, i.e if someone else has made
* the page that we're running in. Otherwise we're in charge of the whole
* page.
*
* @return true if we're running embedded
*/
public boolean isEmbedded() {
return !getElement().getOwnerDocument().getBody().getClassName()
.contains(ApplicationConstants.GENERATED_BODY_CLASSNAME);
}
/**
* Returns true if the size of the parent should be checked periodically and
* the application should react to its changes.
*
* @return true if size of parent should be tracked
*/
protected boolean isMonitoringParentSize() {
// could also perform a more specific check (Liferay portlet)
return isEmbedded();
}
@Override
public void onBrowserEvent(Event event) {
super.onBrowserEvent(event);
int type = DOM.eventGetType(event);
if (type == Event.ONKEYDOWN && actionHandler != null) {
actionHandler.handleKeyboardEvent(event);
return;
}
}
/*
* (non-Javadoc)
*
* @see
* com.google.gwt.event.logical.shared.ResizeHandler#onResize(com.google
* .gwt.event.logical.shared.ResizeEvent)
*/
@Override
public void onResize(ResizeEvent event) {
triggerSizeChangeCheck();
}
/**
* Called when a resize event is received.
*
* This may trigger a lazy refresh or perform the size check immediately
* depending on the browser used and whether the server side requests
* resizes to be lazy.
*/
private void triggerSizeChangeCheck() {
/*
* IE (pre IE9 at least) will give us some false resize events due to
* problems with scrollbars. Firefox 3 might also produce some extra
* events. We postpone both the re-layouting and the server side event
* for a while to deal with these issues.
*
* We may also postpone these events to avoid slowness when resizing the
* browser window. Constantly recalculating the layout causes the resize
* operation to be really slow with complex layouts.
*/
boolean lazy = resizeLazy || BrowserInfo.get().isIE8();
if (lazy) {
delayedResizeExecutor.trigger();
} else {
performSizeCheck();
}
}
/**
* Send new dimensions to the server.
* <p>
* For internal use only. May be removed or replaced in the future.
*/
public void sendClientResized() {
Profiler.enter("VUI.sendClientResized");
Element parentElement = getElement().getParentElement();
int viewHeight = parentElement.getClientHeight();
int viewWidth = parentElement.getClientWidth();
ResizeEvent.fire(this, viewWidth, viewHeight);
Profiler.leave("VUI.sendClientResized");
}
public native static void goTo(String url)
/*-{
$wnd.location = url;
}-*/;
@Override
public void onWindowClosing(Window.ClosingEvent event) {
// Change focus on this window in order to ensure that all state is
// collected from textfields
// TODO this is a naive hack, that only works with text fields and may
// cause some odd issues. Should be replaced with a decent solution, see
// also related BeforeShortcutActionListener interface. Same interface
// might be usable here.
VTextField.flushChangesFromFocusedTextField();
}
private native static void loadAppIdListFromDOM(ArrayList<String> list)
/*-{
var j;
for(j in $wnd.vaadin.vaadinConfigurations) {
// $entry not needed as function is not exported
list.@java.util.Collection::add(Ljava/lang/Object;)(j);
}
}-*/;
@Override
public ShortcutActionHandler getShortcutActionHandler() {
return actionHandler;
}
@Override
public void focus() {
setFocus(true);
}
/**
* Ensures the widget is scrollable eg. after style name changes.
* <p>
* For internal use only. May be removed or replaced in the future.
*/
public void makeScrollable() {
if (touchScrollHandler == null) {
touchScrollHandler = TouchScrollDelegate.enableTouchScrolling(this);
}
touchScrollHandler.addElement(getElement());
}
@Override
public HandlerRegistration addResizeHandler(ResizeHandler resizeHandler) {
return addHandler(resizeHandler, ResizeEvent.getType());
}
@Override
public HandlerRegistration addScrollHandler(ScrollHandler scrollHandler) {
return addHandler(scrollHandler, ScrollEvent.getType());
}
@Override
public int getTabIndex() {
return FocusUtil.getTabIndex(this);
}
@Override
public void setAccessKey(char key) {
FocusUtil.setAccessKey(this, key);
}
@Override
public void setFocus(boolean focused) {
FocusUtil.setFocus(this, focused);
}
@Override
public void setTabIndex(int index) {
FocusUtil.setTabIndex(this, index);
}
/**
* Allows to store the currently focused Element.
*
* Current use case is to store the focus when a Window is opened. Does
* currently handle only a single value. Needs to be extended for #12158
*
* @param focusedElement
*/
public void storeFocus() {
storedFocus = Util.getFocusedElement();
}
/**
* Restores the previously stored focus Element.
*
* Current use case is to restore the focus when a Window is closed. Does
* currently handle only a single value. Needs to be extended for #12158
*
* @return the lastFocusElementBeforeDialogOpened
*/
public void focusStoredElement() {
if (storedFocus != null) {
storedFocus.focus();
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
@Override
public void execute() {
storedFocus.focus();
}
});
}
}
}