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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>YUI Library Examples: Drag & Drop: Custom Click Validator</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
<style>
/*Supplemental CSS for the YUI distribution*/
#custom-doc { width: 95%; min-width: 950px; }
#pagetitle {background-image: url(../../assets/bg_hd.gif);}
</style>
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<script type="text/javascript" src="../../build/logger/logger-min.js"></script>
<script type="text/javascript" src="../../build/dragdrop/dragdrop-debug.js"></script>
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<!--begin custom header content for this example-->
<style type="text/css">
.dd-demo {
position:relative;
border:4px solid #666;
text-align:center;
color:#fff;
cursor:move;
height:100px;
width:100px;
}
#dd-demo-1 {
background:url(../dragdrop/assets/circle.gif) 0 0 no-repeat;
border:0px solid black;
z-index:10;
cursor:default;
}
#dd-demo-2 {
background:#A0B9A6;
top:10px; left:180px;
border:0px solid black;
cursor:default;
}
</style>
<!--end custom header content for this example-->
<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
YAHOO.util.Event.throwErrors = true;
}
</script>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
<div id="pagetitle"><h1>YUI Library Examples: Drag & Drop: Custom Click Validator</h1></div>
</div>
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-ge">
<div class="yui-u first example">
<div class="promo">
<h1>Drag & Drop: Custom Click Validator</h1>
<div class="exampleIntro">
<p>This example demonstrates how to implement a custom click validator to
make a circular drag and drop implementation. Because all DOM elements that
have dimensions are rectangular, the way to implement a circular drag object
is to perform calculations on mousedown to determine whether the mouse was
targeting a valid portion of the element (eg, a portion within the circle).</p>
<p>The same method could be used to create any non-rectangular draggable object.</p>
</div>
<div class="example-container module ">
<div class="hd exampleHd">
<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="dd-circle_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
</div> <div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<div id="dd-demo-1" class="dd-demo"><br />DD</div>
<div id="dd-demo-2" class="dd-demo">DDTarget</div>
<script type="text/javascript">
(function() {
var dd, dd2, clickRadius = 46, startPos,
Event=YAHOO.util.Event, Dom=YAHOO.util.Dom;
YAHOO.util.Event.onDOMReady(function() {
var el = Dom.get("dd-demo-1");
startPos = Dom.getXY(el);
dd = new YAHOO.util.DD(el);
// our custom click validator let's us prevent clicks outside
// of the circle (but within the element) from initiating a
// drag.
dd.clickValidator = function(e) {
// get the screen rectangle for the element
var el = this.getEl();
var region = Dom.getRegion(el);
// get the radius of the largest circle that can fit inside
// var w = region.right - region.left;
// var h = region.bottom - region.top;
// var r = Math.round(Math.min(h, w) / 2);
//-or- just use a well-known radius
var r = clickRadius;
// get the location of the click
var x1 = Event.getPageX(e), y1 = Event.getPageY(e);
// get the center of the circle
var x2 = Math.round((region.right+region.left)/2);
var y2 = Math.round((region.top+region.bottom)/2);
// I don't want text selection even if the click does not
// initiate a drag
Event.preventDefault(e);
// check to see if the click is in the circle
return ( ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) <= r*r );
};
dd.onDragDrop = function(e, id) {
// center it in the square
Dom.setXY(this.getEl(), Dom.getXY(id));
}
dd.onInvalidDrop = function(e) {
// return to the start position
// Dom.setXY(this.getEl(), startPos);
// Animating the move is more intesting
new YAHOO.util.Motion(
this.id, {
points: {
to: startPos
}
},
0.3,
YAHOO.util.Easing.easeOut
).animate();
}
dd2 = new YAHOO.util.DDTarget("dd-demo-2");
});
})();
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h2 class="first">Basic Drag and Drop</h2>
<p>The <a href="http://developer.yahoo.com/yui/dragdrop/">Drag & Drop Utility</a> lets you make HTML elements draggable.</p>
<p>For this example, we will enable drag and drop for the three <code><div></code> elements.</p>
<p>Markup:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
<div id="dd-demo-1" class="dd-demo"><br />DD</div>
<div id="dd-demo-2" class="dd-demo">DDTarget</div>
</textarea>
<p>Code:</p>
<textarea name="code" class="JScript" cols="60" rows="1">
<script type="text/javascript">
(function() {
var dd, dd2, clickRadius = 46, startPos,
Event=YAHOO.util.Event, Dom=YAHOO.util.Dom;
YAHOO.util.Event.onDOMReady(function() {
var el = Dom.get("dd-demo-1");
startPos = Dom.getXY(el);
dd = new YAHOO.util.DD(el);
// our custom click validator let's us prevent clicks outside
// of the circle (but within the element) from initiating a
// drag.
dd.clickValidator = function(e) {
// get the screen rectangle for the element
var el = this.getEl();
var region = Dom.getRegion(el);
// get the radius of the largest circle that can fit inside
// var w = region.right - region.left;
// var h = region.bottom - region.top;
// var r = Math.round(Math.min(h, w) / 2);
//-or- just use a well-known radius
var r = clickRadius;
// get the location of the click
var x1 = Event.getPageX(e), y1 = Event.getPageY(e);
// get the center of the circle
var x2 = Math.round((region.right+region.left)/2);
var y2 = Math.round((region.top+region.bottom)/2);
// I don't want text selection even if the click does not
// initiate a drag
Event.preventDefault(e);
// check to see if the click is in the circle
return ( ((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2)) <= r*r );
};
dd.onDragDrop = function(e, id) {
// center it in the square
Dom.setXY(this.getEl(), Dom.getXY(id));
}
dd.onInvalidDrop = function(e) {
// return to the start position
// Dom.setXY(this.getEl(), startPos);
// Animating the move is more intesting
new YAHOO.util.Motion(
this.id, {
points: {
to: startPos
}
},
0.3,
YAHOO.util.Easing.easeOut
).animate();
}
dd2 = new YAHOO.util.DDTarget("dd-demo-2");
});
})();
</script>
</textarea>
<h2>Configuration for This Example</h2>
<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?dragdrop&animation&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
</div>
<div class="yui-u">
<div id="loggerModule" class="yui-skin-sam">
<h3 class="firstContent">YUI Logger Output:</h3>
<div id="loggerDiv"></div>
<div id="loggerGloss">
<p><strong>Note:</strong> You are viewing this example in debug mode with logging enabled. This can significantly slow performance.</p>
<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="dd-circle.html">Reload with logging<br />and debugging disabled.</a></span></span></p>
</div>
</div>
<div id="examples">
<h3>Drag & Drop Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../dragdrop/dd-basic.html'>Basic Drag and Drop</a></li><li><a href='../dragdrop/dd-handles.html'>Using Handles</a></li><li><a href='../dragdrop/dd-ontop.html'>Dragged Element on Top</a></li><li><a href='../dragdrop/dd-proxy.html'>Using a Proxy Element</a></li><li><a href='../dragdrop/dd-reorder.html'>Reordering a List</a></li><li><a href='../dragdrop/dd-groups.html'>Using Interaction Groups</a></li><li class='selected'><a href='../dragdrop/dd-circle.html'>Custom Click Validator</a></li><li><a href='../dragdrop/dd-region.html'>Staying in a Region</a></li><li><a href='../dragdrop/dd-shim.html'>Using the Drag Shim</a></li><li><a href='../datatable/dt_ddrows.html'>Reorder Rows with Drag and Drop (included with examples for DataTable Control)</a></li> </ul>
</div>
</div>
<div id="module">
<h3>More Drag & Drop Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/dragdrop/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_dragdrop.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/dragdrop.pdf">Cheat Sheet PDF</a> (external)</li></ul>
</div>
</div>
</div>
</div>
</div>
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