egroupware/etemplate/js/et2_dataview_view_resizeable.js

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/**
* EGroupware eTemplate2 - Functions which allow resizing of table headers
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage dataview
* @link http://www.egroupware.org
* @author Andreas Stöckel
* @copyright Stylite 2011
* @version $Id$
*/
/**
* This set of functions is currently only supporting resizing in ew-direction
*/
(function()
{
"use strict";
// Define some constants
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var RESIZE_BORDER = 12;
var RESIZE_MIN_WIDTH = 25;
var RESIZE_ADD = 2; // Used to ensure mouse is under the resize element after resizing has finished
// In resize region returns whether the mouse is currently in the
// "resizeRegion"
function inResizeRegion(_x, _elem)
{
var ol = _x - _elem.offset().left;
return (ol > (_elem.outerWidth(true) - RESIZE_BORDER));
}
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var helper = null;
var overlay = null;
var didResize = false;
var resizeWidth = 0;
function startResize(_outerElem, _elem, _callback, _column)
{
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if (overlay == null || helper == null)
{
// Prevent text selection
// FireFox handles highlight prevention (text selection) different than other browsers
if (typeof _elem[0].style.MozUserSelect !="undefined")
{
_elem[0].style.MozUserSelect = "none";
}
else
{
_elem[0].onselectstart = function() {
return false;
};
}
// Indicate resizing is in progress
$j(_outerElem).addClass('egwResizing');
// Reset the "didResize" flag
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didResize = false;
// Create the resize helper
var left = _elem.offset().left;
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helper = $j(document.createElement("div"))
.addClass("egwResizeHelper")
.appendTo("body")
.css("top", _elem.offset().top + "px")
.css("left", left + "px")
.css("height", _outerElem.outerHeight(true) + "px");
// Create the overlay which will be catching the mouse movements
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overlay = $j(document.createElement("div"))
.addClass("egwResizeOverlay")
.bind("mousemove", function(e) {
didResize = true;
resizeWidth = Math.max(e.pageX - left + RESIZE_ADD,
_column && _column.minWidth ? _column.minWidth : RESIZE_MIN_WIDTH
);
helper.css("width", resizeWidth + "px");
})
.bind("mouseup", function() {
stopResize(_outerElem);
// Reset text selection
_elem[0].onselectstart = null;
// Call the callback if the user actually performed a resize
if (didResize)
{
_callback(resizeWidth);
}
})
.appendTo("body");
}
}
function stopResize(_outerElem)
{
$j(_outerElem).removeClass('egwResizing');
if (helper != null)
{
helper.remove();
helper = null;
}
if (overlay != null)
{
overlay.remove();
overlay = null;
}
}
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this.et2_dataview_makeResizeable = function(_elem, _callback, _context)
{
// Get the table surrounding the given element - this element is used to
// align the helper properly
var outerTable = _elem.closest("table");
// Bind the "mousemove" event in the "resize" namespace
_elem.bind("mousemove.resize", function(e) {
var stopResize = false;
// Stop switch to resize cursor if the mouse position
// is more intended for scrollbar not the resize edge
// 8pixel is an arbitary number for scrolbar area
if (e.target.clientHeight < e.target.scrollHeight && e.target.offsetWidth - e.offsetX <= 8)
{
stopResize = true;
}
_elem.css("cursor", inResizeRegion(e.pageX, _elem) && !stopResize? "ew-resize" : "auto");
});
// Bind the "mousedown" event in the "resize" namespace
_elem.bind("mousedown.resize", function(e) {
var stopResize = false;
// Stop resize if the mouse position is more intended
// for scrollbar not the resize edge
// 8pixel is an arbitary number for scrolbar area
if (e.target.clientHeight < e.target.scrollHeight && e.target.offsetWidth - e.offsetX <= 8)
{
stopResize = true;
}
// Do not triger startResize if clicked element is select-tag, as it may causes conflict in some browsers
if (inResizeRegion(e.pageX, _elem) && e.target.tagName != 'SELECT' && !stopResize)
{
// Start the resizing
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startResize(outerTable, _elem, function(_w) {
_callback.call(_context, _w);
}, _context);
}
});
};
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this.et2_dataview_resetResizeable = function(_elem)
{
// Remove all events in the ".resize" namespace from the element
_elem.unbind(".resize");
};
}).call(window);