egroupware/api/js/jsapi/egw_tooltip.js

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/**
* EGroupware clientside API object
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Andreas Stöckel (as AT stylite.de)
* @author Ralf Becker <RalfBecker@outdoor-training.de>
* @version $Id$
*/
/*egw:uses
jquery.jquery;
egw_core;
*/
/**
*
* @param {string} _app application name object is instanciated for
* @param {object} _wnd window object is instanciated for
*/
egw.extend('tooltip', egw.MODULE_WND_LOCAL, function(_app, _wnd)
{
"use strict";
var tooltip_div = null;
var current_elem = null;
var time_delta = 100;
var show_delta = 0;
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var show_delay = 200;
var x = 0;
var y = 0;
/**
* Removes the tooltip_div from the DOM if it does exist.
*/
function hide()
{
if (tooltip_div != null)
{
tooltip_div.remove();
tooltip_div = null;
}
}
/**
* Shows the tooltip at the current cursor position.
*/
function show()
{
if (tooltip_div && typeof x !== 'undefined' && typeof y !== 'undefined')
{
//Calculate the cursor_rectangle - this is a space the tooltip might
//not overlap with
var cursor_rect = {
left: (x - 8),
top: (y - 8),
right: (x + 8),
bottom: (y + 8)
};
//Calculate how much space is left on each side of the rectangle
var window_width = $j(_wnd.document).width();
var window_height = $j(_wnd.document).height();
var space_left = {
left: (cursor_rect.left),
top: (cursor_rect.top),
right: (window_width - cursor_rect.right),
bottom: (window_height - cursor_rect.bottom)
};
//Get the width and the height of the tooltip
var tooltip_width = tooltip_div.width();
if (tooltip_width > 300) tooltip_width = 300;
var tooltip_height = tooltip_div.height();
if (space_left.right < tooltip_width) {
tooltip_div.css('left', Math.max(0,cursor_rect.left - tooltip_width));
} else if (space_left.left >= tooltip_width) {
tooltip_div.css('left', cursor_rect.right);
} else {
tooltip_div.css('left', cursor_rect.right);
tooltip_div.css('max-width', space_left.right);
}
if (space_left.bottom < tooltip_height) {
tooltip_div.css('top', cursor_rect.top - tooltip_height);
} else if (space_left.top >= tooltip_height) {
tooltip_div.css('top', cursor_rect.bottom);
} else {
tooltip_div.css('top', cursor_rect.bottom);
tooltip_div.css('max-height', space_left.bottom);
}
tooltip_div.fadeIn(100);
}
}
/**
* Creates the tooltip_div with the given text.
*
* @param {string} _html
*/
function prepare(_html)
{
// Free and null the old tooltip_div
hide();
//Generate the tooltip div, set it's text and append it to the body tag
tooltip_div = $j(_wnd.document.createElement('div'));
tooltip_div.hide();
tooltip_div.append(_html);
tooltip_div.addClass("egw_tooltip");
$j(_wnd.document.body).append(tooltip_div);
//The tooltip should automatically hide when the mouse comes over it
tooltip_div.mouseenter(function() {
hide();
});
}
/**
* showTooltipTimeout is used to prepare showing the tooltip.
*/
function showTooltipTimeout()
{
if (current_elem != null)
{
show_delta += time_delta;
if (show_delta < show_delay)
{
//Repeat the call of timeout
_wnd.setTimeout(showTooltipTimeout, time_delta);
}
else
{
show_delta = 0;
show();
}
}
}
return {
/**
* Binds a tooltip to the given DOM-Node with the given html.
* It is important to remove all tooltips from all elements which are
* no longer needed, in order to prevent memory leaks.
*
* @param _elem is the element to which the tooltip should get bound. It
* has to be a jQuery node.
* @param _html is the html code which should be shown as tooltip.
*/
tooltipBind: function(_elem, _html) {
if (_html != '')
{
_elem.bind('mouseenter.tooltip', function(e) {
if (_elem != current_elem)
{
//Prepare the tooltip
prepare(_html);
// Set the current element the mouse is over and
// initialize the position variables
current_elem = _elem;
show_delta = 0;
x = e.clientX;
y = e.clientY;
// Create the timeout for showing the timeout
_wnd.setTimeout(showTooltipTimeout, time_delta);
}
return false;
});
_elem.bind('mouseleave.tooltip', function() {
current_elem = null;
show_delta = 0;
if (tooltip_div)
{
tooltip_div.fadeOut(100);
}
});
_elem.bind('mousemove.tooltip', function(e) {
//Calculate the distance the mouse took since the last call of mousemove
var dx = x - e.clientX;
var dy = y - e.clientY;
var movedist = Math.sqrt(dx * dx + dy * dy);
//Block appereance of the tooltip on fast movements (with small movedistances)
if (movedist > 2)
{
show_delta = 0;
}
x = e.clientX;
y = e.clientY;
});
}
},
/**
* Unbinds the tooltip from the given DOM-Node.
*
* @param _elem is the element from which the tooltip should get
* removed. _elem has to be a jQuery node.
*/
tooltipUnbind: function(_elem) {
if (current_elem == _elem)
{
hide();
current_elem = null;
}
// Unbind all "tooltip" events from the given element
_elem.unbind('.tooltip');
}
};
});