mirror of
https://github.com/alchemy-fr/Phraseanet.git
synced 2025-10-13 21:13:26 +00:00
158 lines
4.5 KiB
HTML
158 lines
4.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Custom Click Validator</title>
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<style type="text/css">
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/*margin and padding on body element
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can introduce errors in determining
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element position and are not recommended;
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we turn them off as a foundation for YUI
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CSS treatments. */
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body {
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margin:0;
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padding:0;
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}
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</style>
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<link rel="stylesheet" type="text/css" href="../../build/fonts/fonts-min.css" />
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<script type="text/javascript" src="../../build/yahoo-dom-event/yahoo-dom-event.js"></script>
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<script type="text/javascript" src="../../build/dragdrop/dragdrop-min.js"></script>
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<script type="text/javascript" src="../../build/animation/animation-min.js"></script>
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<!--begin custom header content for this example-->
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<style type="text/css">
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.dd-demo {
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position:relative;
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border:4px solid #666;
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text-align:center;
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color:#fff;
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cursor:move;
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height:100px;
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width:100px;
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}
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#dd-demo-1 {
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background:url(../dragdrop/assets/circle.gif) 0 0 no-repeat;
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border:0px solid black;
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z-index:10;
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cursor:default;
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}
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#dd-demo-2 {
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background:#A0B9A6;
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top:10px; left:180px;
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border:0px solid black;
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cursor:default;
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}
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</style>
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<!--end custom header content for this example-->
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</head>
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<body class="yui-skin-sam">
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<h1>Custom Click Validator</h1>
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<div class="exampleIntro">
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<p>This example demonstrates how to implement a custom click validator to
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make a circular drag and drop implementation. Because all DOM elements that
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have dimensions are rectangular, the way to implement a circular drag object
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is to perform calculations on mousedown to determine whether the mouse was
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targeting a valid portion of the element (eg, a portion within the circle).</p>
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<p>The same method could be used to create any non-rectangular draggable object.</p>
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</div>
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
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<div id="dd-demo-1" class="dd-demo"><br />DD</div>
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<div id="dd-demo-2" class="dd-demo">DDTarget</div>
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<script type="text/javascript">
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(function() {
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var dd, dd2, clickRadius = 46, startPos,
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Event=YAHOO.util.Event, Dom=YAHOO.util.Dom;
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YAHOO.util.Event.onDOMReady(function() {
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var el = Dom.get("dd-demo-1");
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startPos = Dom.getXY(el);
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dd = new YAHOO.util.DD(el);
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// our custom click validator let's us prevent clicks outside
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// of the circle (but within the element) from initiating a
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// drag.
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dd.clickValidator = function(e) {
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// get the screen rectangle for the element
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var el = this.getEl();
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var region = Dom.getRegion(el);
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// get the radius of the largest circle that can fit inside
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// var w = region.right - region.left;
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// var h = region.bottom - region.top;
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// var r = Math.round(Math.min(h, w) / 2);
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//-or- just use a well-known radius
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var r = clickRadius;
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// get the location of the click
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var x1 = Event.getPageX(e), y1 = Event.getPageY(e);
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// get the center of the circle
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var x2 = Math.round((region.right+region.left)/2);
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var y2 = Math.round((region.top+region.bottom)/2);
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// I don't want text selection even if the click does not
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// initiate a drag
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Event.preventDefault(e);
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// check to see if the click is in the circle
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return ( ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) <= r*r );
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};
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dd.onDragDrop = function(e, id) {
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// center it in the square
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Dom.setXY(this.getEl(), Dom.getXY(id));
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}
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dd.onInvalidDrop = function(e) {
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// return to the start position
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// Dom.setXY(this.getEl(), startPos);
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// Animating the move is more intesting
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new YAHOO.util.Motion(
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this.id, {
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points: {
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to: startPos
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}
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},
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0.3,
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YAHOO.util.Easing.easeOut
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).animate();
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}
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dd2 = new YAHOO.util.DDTarget("dd-demo-2");
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});
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})();
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</script>
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<!--END SOURCE CODE FOR EXAMPLE =============================== -->
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</body>
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</html>
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