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/*
* Copyright 2011 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.dom.client;
import com.google.gwt.core.client.JavaScriptObject;
/**
* StandardBase implementation of {@link com.google.gwt.user.client.impl.DOMImpl}.
*/
class DOMImplStandardBase extends DOMImplStandard {
private static class ClientRect extends JavaScriptObject {
protected ClientRect() {
}
public final int getLeft() {
return toInt32(getSubPixelLeft());
}
public final int getTop() {
return toInt32(getSubPixelTop());
}
private final native double getSubPixelLeft() /*-{
return this.left;
}-*/;
private final native double getSubPixelTop() /*-{
return this.top;
}-*/;
}
private static native double getAbsoluteLeftUsingOffsets(Element elem) /*-{
// Unattached elements and elements (or their ancestors) with style
// 'display: none' have no offsetLeft.
if (elem.offsetLeft == null) {
return 0;
}
var left = 0;
var doc = elem.ownerDocument;
var curr = elem.parentNode;
if (curr) {
// This intentionally excludes body which has a null offsetParent.
while (curr.offsetParent) {
left -= curr.scrollLeft;
// In RTL mode, offsetLeft is relative to the left edge of the
// scrollable area when scrolled all the way to the right, so we need
// to add back that difference.
if (doc.defaultView.getComputedStyle(curr, '').getPropertyValue('direction') == 'rtl') {
left += (curr.scrollWidth - curr.clientWidth);
}
curr = curr.parentNode;
}
}
while (elem) {
left += elem.offsetLeft;
if (doc.defaultView.getComputedStyle(elem, '')['position'] == 'fixed') {
left += doc.body.scrollLeft;
return left;
}
// Safari 3 does not include borders with offsetLeft, so we need to add
// the borders of the parent manually.
var parent = elem.offsetParent;
if (parent && $wnd.devicePixelRatio) {
left += parseInt(doc.defaultView.getComputedStyle(parent, '').getPropertyValue('border-left-width'));
}
// Safari bug: a top-level absolutely positioned element includes the
// body's offset position already.
if (parent && (parent.tagName == 'BODY') &&
(elem.style.position == 'absolute')) {
break;
}
elem = parent;
}
return left;
}-*/;
private static native double getAbsoluteTopUsingOffsets(Element elem) /*-{
// Unattached elements and elements (or their ancestors) with style
// 'display: none' have no offsetTop.
if (elem.offsetTop == null) {
return 0;
}
var top = 0;
var doc = elem.ownerDocument;
var curr = elem.parentNode;
if (curr) {
// This intentionally excludes body which has a null offsetParent.
while (curr.offsetParent) {
top -= curr.scrollTop;
curr = curr.parentNode;
}
}
while (elem) {
top += elem.offsetTop;
if (doc.defaultView.getComputedStyle(elem, '')['position'] == 'fixed') {
top += doc.body.scrollTop;
return top;
}
// Safari 3 does not include borders with offsetTop, so we need to add the
// borders of the parent manually.
var parent = elem.offsetParent;
if (parent && $wnd.devicePixelRatio) {
top += parseInt(doc.defaultView.getComputedStyle(parent, '').getPropertyValue('border-top-width'));
}
// Safari bug: a top-level absolutely positioned element includes the
// body's offset position already.
if (parent && (parent.tagName == 'BODY') &&
(elem.style.position == 'absolute')) {
break;
}
elem = parent;
}
return top;
}-*/;
private static native ClientRect getBoundingClientRect(Element element) /*-{
return element.getBoundingClientRect && element.getBoundingClientRect();
}-*/;
/**
* The type property on a button element is read-only in safari, so we need to
* set it using setAttribute.
*/
@Override
public native ButtonElement createButtonElement(Document doc, String type) /*-{
var e = doc.createElement("BUTTON");
e.setAttribute('type', type);
return e;
}-*/;
@Override
public native NativeEvent createKeyCodeEvent(Document doc, String type,
boolean ctrlKey, boolean altKey, boolean shiftKey, boolean metaKey,
int keyCode) /*-{
var evt = [email protected]::createKeyEvent(Lcom/google/gwt/dom/client/Document;Ljava/lang/String;ZZZZZZ)(doc, type, true, true, ctrlKey, altKey, shiftKey, metaKey)
evt.keyCode = keyCode;
return evt;
}-*/;
@Override
@Deprecated
public native NativeEvent createKeyEvent(Document doc, String type,
boolean canBubble, boolean cancelable, boolean ctrlKey, boolean altKey,
boolean shiftKey, boolean metaKey, int keyCode, int charCode) /*-{
var evt = [email protected]::createKeyEvent(Lcom/google/gwt/dom/client/Document;Ljava/lang/String;ZZZZZZ)(doc, type, canBubble, cancelable, ctrlKey, altKey, shiftKey, metaKey)
evt.keyCode = keyCode;
evt.charCode = charCode;
return evt;
}-*/;
@Override
public native NativeEvent createKeyPressEvent(Document doc,
boolean ctrlKey, boolean altKey, boolean shiftKey, boolean metaKey,
int charCode) /*-{
var evt = [email protected]::createKeyEvent(Lcom/google/gwt/dom/client/Document;Ljava/lang/String;ZZZZZZ)(doc, 'keypress', true, true, ctrlKey, altKey, shiftKey, metaKey)
evt.charCode = charCode;
return evt;
}-*/;
/**
* Safari 2 does not support {@link ScriptElement#setText(String)}.
*/
@Override
public ScriptElement createScriptElement(Document doc, String source) {
ScriptElement elem = (ScriptElement) createElement(doc, "script");
elem.setInnerText(source);
return elem;
}
@Override
public native EventTarget eventGetCurrentTarget(NativeEvent event) /*-{
return event.currentTarget || $wnd;
}-*/;
@Override
public native int eventGetMouseWheelVelocityY(NativeEvent evt) /*-{
return Math.round(-evt.wheelDelta / 40) || 0;
}-*/;
@Override
public int getAbsoluteLeft(Element elem) {
ClientRect rect = getBoundingClientRect(elem);
double left = rect != null ? rect.getSubPixelLeft()
+ getScrollLeft(elem.getOwnerDocument())
: getAbsoluteLeftUsingOffsets(elem);
return toInt32(left);
}
@Override
public int getAbsoluteTop(Element elem) {
ClientRect rect = getBoundingClientRect(elem);
double top = rect != null ? rect.getSubPixelTop()
+ getScrollTop(elem.getOwnerDocument())
: getAbsoluteTopUsingOffsets(elem);
return toInt32(top);
}
@Override
public int getScrollLeft(Element elem) {
if (!elem.hasTagName(BodyElement.TAG) && isRTL(elem)) {
return super.getScrollLeft(elem)
- (elem.getScrollWidth() - elem.getClientWidth());
}
return super.getScrollLeft(elem);
}
@Override
public native int getTabIndex(Element elem) /*-{
// tabIndex is undefined for divs and other non-focusable elements prior to
// Safari 4.
return typeof elem.tabIndex != 'undefined' ? elem.tabIndex : -1;
}-*/;
@Override
public void setScrollLeft(Element elem, int left) {
if (!elem.hasTagName(BodyElement.TAG) && isRTL(elem)) {
left += elem.getScrollWidth() - elem.getClientWidth();
}
super.setScrollLeft(elem, left);
}
protected native boolean isRTL(Element elem) /*-{
return elem.ownerDocument.defaultView.getComputedStyle(elem, '').direction == 'rtl';
}-*/;
private native NativeEvent createKeyEvent(Document doc, String type,
boolean canBubble, boolean cancelable, boolean ctrlKey, boolean altKey,
boolean shiftKey, boolean metaKey) /*-{
// WebKit's KeyboardEvent cannot set or even initialize charCode, keyCode, etc.
// And UIEvent's charCode and keyCode are read-only.
// So we "fake" an event using a raw Event and expandos
var evt = doc.createEvent('Event');
evt.initEvent(type, canBubble, cancelable);
evt.ctrlKey = ctrlKey;
evt.altKey = altKey;
evt.shiftKey = shiftKey;
evt.metaKey = metaKey;
return evt;
}-*/;
}
