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/*******************************************************************************
* Copyright: 2004, 2012 1&1 Internet AG, Germany, http://www.1und1.de,
* and EclipseSource
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this
* distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* 1&1 Internet AG and others - original API and implementation
* EclipseSource - adaptation for the Eclipse Rich Ajax Platform
*
* This class contains code based on the following work:
*
* * Yahoo! UI Library
* http://developer.yahoo.com/yui
* Version 2.2.0
*
* Copyright:
* (c) 2007, Yahoo! Inc.
*
* License:
* BSD: http://developer.yahoo.com/yui/license.txt
*
******************************************************************************/
/**
* Includes library functions to work with the client's viewport (window).
*/
rwt.qx.Class.define("rwt.html.Viewport",
{
statics :
{
/**
* Returns the current width of the viewport (excluding a eventually visible scrollbar).
*
* clientWidth is the inner width of an element in pixels. It includes padding
* but not the vertical scrollbar (if present, if rendered), border or margin.
*
* The property innerWidth is not useable as defined by the standard as it includes the scrollbars
* which is not the indented behavior of this method. We can decrement the size by the scrollbar
* size but there are easier possibilities to work around this.
*
* Safari 2 and 3 beta (3.0.2) do not correctly implement clientWidth on documentElement/body,
* but innerWidth works there. Interesting is that webkit do not correctly implement
* innerWidth, too. It calculates the size excluding the scroll bars and this
* differs from the behavior of all other browsers - but this is exactly what we want to have
* in this case.
*
* Opera as of 9.21 only works well using body.clientWidth.
*
* Verified to correctly work with:
*
* * Mozilla Firefox 2.0.0.4
* * Opera 9.2.1
* * Safari 3.0 beta (3.0.2)
* * Internet Explorer 7.0
*
* @type static
* @signature function(win)
* @param win {Window?window} The window to query
* @return {Integer} The width of the viewable area of the page (excludes scrollbars).
*/
getWidth : rwt.util.Variant.select("qx.client",
{
"opera" : function(win) {
return (win||window).document.body.clientWidth;
},
"webkit" : function(win) {
return (win||window).innerWidth;
},
"default" : function(win)
{
var doc = (win||window).document;
return doc.compatMode === "CSS1Compat" ? doc.documentElement.clientWidth : doc.body.clientWidth;
}
}),
/**
* Returns the current height of the viewport (excluding a eventually visible scrollbar).
*
* clientHeight is the inner height of an element in pixels. It includes padding
* but not the vertical scrollbar (if present, if rendered), border or margin.
*
* The property innerHeight is not useable as defined by the standard as it includes the scrollbars
* which is not the indented behavior of this method. We can decrement the size by the scrollbar
* size but there are easier possibilities to work around this.
*
* Safari 2 and 3 beta (3.0.2) do not correctly implement clientHeight on documentElement/body,
* but innerHeight works there. Interesting is that webkit do not correctly implement
* innerHeight, too. It calculates the size excluding the scroll bars and this
* differs from the behavior of all other browsers - but this is exactly what we want to have
* in this case.
*
* Opera as of 9.21 only works well using body.clientHeight.
*
* Verified to correctly work with:
*
* * Mozilla Firefox 2.0.0.4
* * Opera 9.2.1
* * Safari 3.0 beta (3.0.2)
* * Internet Explorer 7.0
*
* @type static
* @signature function(win)
* @param win {Window?window} The window to query
* @return {Integer} The Height of the viewable area of the page (excludes scrollbars).
*/
getHeight : rwt.util.Variant.select("qx.client",
{
"opera" : function(win) {
return (win||window).document.body.clientHeight;
},
"webkit" : function(win) {
return (win||window).innerHeight;
},
"default" : function(win)
{
var doc = (win||window).document;
return doc.compatMode === "CSS1Compat" ? doc.documentElement.clientHeight : doc.body.clientHeight;
}
}),
/**
* Returns the scroll position of the viewport
*
* All clients except MSHTML supports the non-standard property pageXOffset.
* As this is easier to evaluate we prefer this property over scrollLeft.
*
* For MSHTML the access method differs between standard and quirks mode;
* as this can differ from document to document this test must be made on
* each query.
*
* Verified to correctly work with:
*
* * Mozilla Firefox 2.0.0.4
* * Opera 9.2.1
* * Safari 3.0 beta (3.0.2)
* * Internet Explorer 7.0
*
* @type static
* @signature function(win)
* @param win {Window?window} The window to query
* @return {Integer} Scroll position from left edge, always a positive integer
*/
getScrollLeft : rwt.util.Variant.select("qx.client",
{
"mshtml" : function(win)
{
var doc = (win||window).document;
return doc.documentElement.scrollLeft || doc.body.scrollLeft;
},
"default" : function(win) {
return (win||window).pageXOffset;
}
}),
/**
* Returns the scroll position of the viewport
*
* All clients except MSHTML supports the non-standard property pageYOffset.
* As this is easier to evaluate we prefer this property over scrollTop.
*
* For MSHTML the access method differs between standard and quirks mode;
* as this can differ from document to document this test must be made on
* each query.
*
* Verified to correctly work with:
*
* * Mozilla Firefox 2.0.0.4
* * Opera 9.2.1
* * Safari 3.0 beta (3.0.2)
* * Internet Explorer 7.0
*
* @type static
* @signature function(win)
* @param win {Window?window} The window to query
* @return {Integer} Scroll position from left edge, always a positive integer
*/
getScrollTop : rwt.util.Variant.select("qx.client",
{
"mshtml" : function(win)
{
var doc = (win||window).document;
return doc.documentElement.scrollTop || doc.body.scrollTop;
},
"default" : function(win) {
return (win||window).pageYOffset;
}
})
}
});
