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/*
* Copyright 2009 Google 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.google.gwt.user.client.impl;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Element;
import com.google.gwt.user.client.Event;
/**
* Trident layout engine implementation of
* {@link com.google.gwt.user.client.impl.DOMImpl}.
*/
public abstract class DOMImplTrident extends DOMImpl {
private static JavaScriptObject callDispatchEvent;
private static JavaScriptObject callDispatchDblClickEvent;
private static JavaScriptObject callDispatchOnLoadEvent;
private static JavaScriptObject callDispatchUnhandledEvent;
/**
* Let every GWT app on the page preview the current event. If any app cancels
* the event, the event will be canceled for all apps.
*
* @return false to cancel the event
*/
private static native boolean previewEventImpl() /*-{
var isCancelled = false;
for (var i = 0; i < $wnd.__gwt_globalEventArray.length; i++) {
if (!$wnd.__gwt_globalEventArray[i]()) {
isCancelled = true;
}
}
return !isCancelled;
}-*/;
@Override
public native Element eventGetFromElement(Event evt) /*-{
// Prefer 'relatedTarget' if it's set (see createMouseEvent(), which
// explicitly sets relatedTarget when synthesizing mouse events).
return evt.relatedTarget || evt.fromElement;
}-*/;
@Override
public native Element eventGetToElement(Event evt) /*-{
// Prefer 'relatedTarget' if it's set (see createMouseEvent(), which
// explicitly sets relatedTarget when synthesizing mouse events).
return evt.relatedTarget || evt.toElement;
}-*/;
@Override
public native Element getChild(Element elem, int index) /*-{
return elem.children[index];
}-*/;
@Override
public native int getChildCount(Element elem) /*-{
return elem.children.length;
}-*/;
@Override
public native int getChildIndex(Element parent, Element child) /*-{
var count = parent.children.length;
for (var i = 0; i < count; ++i) {
if (child === parent.children[i]) {
return i;
}
}
return -1;
}-*/;
@Override
public native void initEventSystem() /*-{
// All GWT apps on the page register themselves with the globalEventArray
// so that the first app to handle an event can allow all apps on the page
// to preview it. See issue 3892 for more details.
//
// Apps cannot just mark the event as they visit it for a few reasons.
// First, window level event handlers fire last in IE, so the first app to
// cancel the event will be the last to see it. Second, window events do
// not support arbitrary attributes, and the only writable field is the
// returnValue, which has another use. Finally, window events are not
// comparable (ex. a=event; b=event; a!=b), so we cannot keep a list of
// events that have already been previewed by the current app.
if ($wnd.__gwt_globalEventArray == null) {
$wnd.__gwt_globalEventArray = new Array();
}
$wnd.__gwt_globalEventArray[$wnd.__gwt_globalEventArray.length] = $entry(function() {
return @com.google.gwt.user.client.DOM::previewEvent(Lcom/google/gwt/user/client/Event;)($wnd.event);
});
var dispatchEvent = $entry(function() {
// IE doesn't define event.currentTarget, so we squirrel it away here. It
// also seems that IE won't allow you to add expandos to the event object,
// so we have to store it in a global. This is ok because only one event
// can actually be dispatched at a time.
var oldEventTarget = @com.google.gwt.dom.client.DOMImplTrident::currentEventTarget;
@com.google.gwt.dom.client.DOMImplTrident::currentEventTarget = this;
// The first GWT app on the page to handle the event allows all apps to
// preview it before continuing or cancelling, which is consistent with
// other browsers.
if ($wnd.event.returnValue == null) {
$wnd.event.returnValue = true;
if ([email protected]::previewEventImpl()()) {
@com.google.gwt.dom.client.DOMImplTrident::currentEventTarget = oldEventTarget;
return;
}
}
var getEventListener = @com.google.gwt.user.client.impl.DOMImpl::getEventListener(*);
var listener, curElem = this;
while (curElem && !(listener = getEventListener(curElem))) {
curElem = curElem.parentElement;
}
if (listener) {
@com.google.gwt.user.client.DOM::dispatchEvent(Lcom/google/gwt/user/client/Event;Lcom/google/gwt/dom/client/Element;Lcom/google/gwt/user/client/EventListener;)($wnd.event, curElem, listener);
}
@com.google.gwt.dom.client.DOMImplTrident::currentEventTarget = oldEventTarget;
});
var dispatchDblClickEvent = $entry(function() {
var newEvent = $doc.createEventObject();
// Synthesize a click event if one hasn't already been synthesized.
// Issue 4027: fireEvent is undefined on disabled input elements.
if ($wnd.event.returnValue == null && $wnd.event.srcElement.fireEvent) {
$wnd.event.srcElement.fireEvent('onclick', newEvent);
}
if (this.__eventBits & 2) {
dispatchEvent.call(this);
} else if ($wnd.event.returnValue == null) {
// Ensure that we preview the event even if we aren't handling it.
$wnd.event.returnValue = true;
@com.google.gwt.user.client.impl.DOMImplTrident::previewEventImpl()();
}
});
var dispatchUnhandledEvent = $entry(function() {
this.__gwtLastUnhandledEvent = $wnd.event.type;
dispatchEvent.call(this);
});
// Hook the above functions on the current window object, and
// create a caller function for each one that indirects via
// the global object. Make sure that the caller function has
// no direct reference to the GWT program.
var moduleName = @com.google.gwt.core.client.GWT::getModuleName()().replace(/\./g,'_');
$wnd['__gwt_dispatchEvent_' + moduleName] = dispatchEvent;
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent = new Function('w',
'return function() { w.__gwt_dispatchEvent_' + moduleName + '.call(this) }')($wnd);
$wnd['__gwt_dispatchDblClickEvent_' + moduleName] = dispatchDblClickEvent;
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchDblClickEvent = new Function('w',
'return function() { w.__gwt_dispatchDblClickEvent_' + moduleName + '.call(this)}')($wnd);
$wnd['__gwt_dispatchUnhandledEvent_' + moduleName] = dispatchUnhandledEvent;
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchUnhandledEvent = new Function('w',
'return function() { w.__gwt_dispatchUnhandledEvent_' + moduleName + '.call(this)}')($wnd);
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchOnLoadEvent = new Function('w',
'return function() { w.__gwt_dispatchUnhandledEvent_' + moduleName + '.call(w.event.srcElement)}')($wnd);
// We need to create these delegate functions to fix up the 'this' context.
// Normally, 'this' is the firing element, but this is only true for
// 'onclick = ...' event handlers, not for handlers setup via attachEvent().
var bodyDispatcher = $entry(function() { dispatchEvent.call($doc.body); });
var bodyDblClickDispatcher = $entry(function() { dispatchDblClickEvent.call($doc.body); });
$doc.body.attachEvent('onclick', bodyDispatcher);
$doc.body.attachEvent('onmousedown', bodyDispatcher);
$doc.body.attachEvent('onmouseup', bodyDispatcher);
$doc.body.attachEvent('onmousemove', bodyDispatcher);
$doc.body.attachEvent('onmousewheel', bodyDispatcher);
$doc.body.attachEvent('onkeydown', bodyDispatcher);
$doc.body.attachEvent('onkeypress', bodyDispatcher);
$doc.body.attachEvent('onkeyup', bodyDispatcher);
$doc.body.attachEvent('onfocus', bodyDispatcher);
$doc.body.attachEvent('onblur', bodyDispatcher);
$doc.body.attachEvent('ondblclick', bodyDblClickDispatcher);
$doc.body.attachEvent('oncontextmenu', bodyDispatcher);
}-*/;
@Override
public native void insertChild(Element parent, Element child, int index) /*-{
if (index >= parent.children.length)
parent.appendChild(child);
else
parent.insertBefore(child, parent.children[index]);
}-*/;
@Override
public void releaseCapture(Element elem) {
maybeInitializeEventSystem();
releaseCaptureImpl(elem);
}
@Override
public void setCapture(Element elem) {
maybeInitializeEventSystem();
setCaptureImpl(elem);
}
@Override
public void sinkBitlessEvent(Element elem, String eventTypeName) {
// not supported
}
@Override
public void sinkEvents(Element elem, int bits) {
maybeInitializeEventSystem();
sinkEventsImpl(elem, bits);
}
@Override
protected void disposeEventSystem() {
// TODO(cromwellian) support shutdown of event system if possible
}
private native void releaseCaptureImpl(Element elem) /*-{
elem.releaseCapture();
}-*/;
private native void setCaptureImpl(Element elem) /*-{
elem.setCapture();
}-*/;
private native void sinkEventsImpl(Element elem, int bits) /*-{
var chMask = (elem.__eventBits || 0) ^ bits;
elem.__eventBits = bits;
if (!chMask) return;
if (chMask & 0x00001) elem.onclick = (bits & 0x00001) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
// Add a ondblclick handler if onclick is desired to ensure that
// a user's double click will result in two onclick events.
if (chMask & (0x00003)) elem.ondblclick = (bits & (0x00003)) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchDblClickEvent : null;
if (chMask & 0x00004) elem.onmousedown = (bits & 0x00004) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00008) elem.onmouseup = (bits & 0x00008) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00010) elem.onmouseover = (bits & 0x00010) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00020) elem.onmouseout = (bits & 0x00020) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00040) elem.onmousemove = (bits & 0x00040) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00080) elem.onkeydown = (bits & 0x00080) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00100) elem.onkeypress = (bits & 0x00100) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00200) elem.onkeyup = (bits & 0x00200) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00400) elem.onchange = (bits & 0x00400) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x00800) elem.onfocus = (bits & 0x00800) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x01000) elem.onblur = (bits & 0x01000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x02000) elem.onlosecapture = (bits & 0x02000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x04000) elem.onscroll = (bits & 0x04000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x08000) {
if (elem.nodeName == "IFRAME") {
if (bits & 0x08000) {
elem.attachEvent('onload', @com.google.gwt.user.client.impl.DOMImplTrident::callDispatchOnLoadEvent);
} else {
elem.detachEvent('onload', @com.google.gwt.user.client.impl.DOMImplTrident::callDispatchOnLoadEvent);
}
} else {
elem.onload = (bits & 0x08000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchUnhandledEvent : null;
}
}
if (chMask & 0x10000) elem.onerror = (bits & 0x10000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x20000) elem.onmousewheel = (bits & 0x20000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x40000) elem.oncontextmenu = (bits & 0x40000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
if (chMask & 0x80000) elem.onpaste = (bits & 0x80000) ?
@com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
}-*/;
}
