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366 lines
21 KiB
HTML
366 lines
21 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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<title>YUI Library Examples: Drag & Drop: Custom Click Validator</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
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<style>
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/*Supplemental CSS for the YUI distribution*/
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#custom-doc { width: 95%; min-width: 950px; }
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#pagetitle {background-image: url(../../assets/bg_hd.gif);}
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</style>
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<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
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<!--Script and CSS includes for YUI dependencies on this page-->
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<link rel="stylesheet" type="text/css" href="../../build/logger/assets/skins/sam/logger.css" />
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<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
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<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
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<script type="text/javascript" src="../../build/event/event-min.js"></script>
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<script type="text/javascript" src="../../build/dom/dom-min.js"></script>
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<script type="text/javascript" src="../../build/logger/logger-min.js"></script>
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<script type="text/javascript" src="../../build/dragdrop/dragdrop-debug.js"></script>
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<script type="text/javascript" src="../../build/animation/animation-min.js"></script>
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<script type="text/javascript" src="../../build/element/element-min.js"></script>
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<script type="text/javascript" src="../../build/button/button-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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<script type="text/javascript">
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//enable passthrough of errors from YUI Event:
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if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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YAHOO.util.Event.throwErrors = true;
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}
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</script>
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</head>
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<body id="yahoo-com" class="yui-skin-sam">
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<div id="custom-doc" class="yui-t2">
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<div id="hd">
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<div id="ygunav">
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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<form action="http://search.yahoo.com/search" id="sitesearchform">
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<input name="vs" type="hidden" value="developer.yahoo.com">
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<input name="vs" type="hidden" value="yuiblog.com">
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<div id="sitesearch">
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<label for="searchinput">Site Search (YDN & YUIBlog): </label>
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<input type="text" id="searchinput" name="p">
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<input type="submit" value="Search" id="searchsubmit" class="ygbt">
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</div>
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</form> </div>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
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<div id="pagetitle"><h1>YUI Library Examples: Drag & Drop: Custom Click Validator</h1></div>
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</div>
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<div id="bd">
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<div id="yui-main">
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<div class="yui-b">
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<div class="yui-ge">
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<div class="yui-u first example">
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<div class="promo">
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<h1>Drag & Drop: 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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<div class="example-container module ">
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<div class="hd exampleHd">
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<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>-->
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</div> <div id="example-canvas" class="bd">
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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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</div>
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</div>
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</div>
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<h2 class="first">Basic Drag and Drop</h2>
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<p>The <a href="http://developer.yahoo.com/yui/dragdrop/">Drag & Drop Utility</a> lets you make HTML elements draggable.</p>
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<p>For this example, we will enable drag and drop for the three <code><div></code> elements.</p>
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<p>Markup:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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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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</textarea>
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<p>Code:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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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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</textarea>
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<h2>Configuration for This Example</h2>
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<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>
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</div>
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<div class="yui-u">
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<div id="loggerModule" class="yui-skin-sam">
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<h3 class="firstContent">YUI Logger Output:</h3>
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<div id="loggerDiv"></div>
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<div id="loggerGloss">
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<p><strong>Note:</strong> You are viewing this example in debug mode with logging enabled. This can significantly slow performance.</p>
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<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>
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</div>
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</div>
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<div id="examples">
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<h3>Drag & Drop Examples:</h3>
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<div id="exampleToc">
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<ul>
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<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>
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</div>
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</div>
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<div id="module">
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<h3>More Drag & Drop Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/dragdrop/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_dragdrop.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/dragdrop.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="yui-b" id="tocWrapper">
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<!-- TABLE OF CONTENTS -->
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<div id="toc">
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<ul>
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<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! User Interface Blog" href="http://yuiblog.com">YUIBlog (external)</a></li><li class="item"><a title="YUILibrary.com hosts the YUI community forums" href="http://yuilibrary.com/forum/">YUI Discussion Forum (external)</a></li><li class="item"><a title="The YUI Library source can be checked out from GitHub" href="http://github.com/yui/">YUI on GitHub</a></li><li class="item"><a title="Instantly searchable API documentation for the entire YUI library." href="../../docs/index.html">API Documentation</a></li><li class="item"><a title="Examples of every YUI utility and control in action" href="../../examples/">Functional Examples</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="item"><a title="YUI is free and open, offered under a BSD license." href="http://developer.yahoo.com/yui/license.html">YUI License (external)</a></li><li class="sect">YUI Functional Examples</li><li class="item"><a title="The YUI Animation Utility - Functional Examples" href="../../examples/animation/index.html">Animation</a></li><li class="item"><a title="The YUI AutoComplete Control - Functional Examples" href="../../examples/autocomplete/index.html">AutoComplete</a></li><li class="item"><a title="The YUI Browser History Manager - Functional Examples" href="../../examples/history/index.html">Browser History Manager</a></li><li class="item"><a title="The YUI Button Control - Functional Examples" href="../../examples/button/index.html">Button</a></li><li class="item"><a title="The YUI Calendar Control - Functional Examples" href="../../examples/calendar/index.html">Calendar</a></li><li class="item"><a title="The YUI Carousel Control - Functional Examples" href="../../examples/carousel/index.html">Carousel</a></li><li class="item"><a title="The YUI Charts Control - Functional Examples" href="../../examples/charts/index.html">Charts</a></li><li class="item"><a title="The YUI Color Picker Control - Functional Examples" href="../../examples/colorpicker/index.html">Color Picker</a></li><li class="item"><a title="The YUI Cookie Utility - Functional Examples" href="../../examples/cookie/index.html">Cookie</a></li><li class="item"><a title="The YUI Connection Manager (AJAX) - Functional Examples" href="../../examples/connection/index.html">Connection Manager</a></li><li class="item"><a title="The YUI Container Family (Module, Overlay, Tooltip, Panel, Dialog, SimpleDialog) - Functional Examples" href="../../examples/container/index.html">Container</a></li><li class="item"><a title="The YUI DataTable Control - Functional Examples" href="../../examples/datatable/index.html">DataTable</a></li><li class="item"><a title="The YUI Dom Collection - Functional Examples" href="../../examples/dom/index.html">Dom</a></li><li class="selected "><a title="The YUI Drag & Drop Utility - Functional Examples" href="../../examples/dragdrop/index.html">Drag & Drop</a></li><li class="item"><a title="The YUI Event Utility - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="The YUI Get Utility - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="The YUI ImageCropper Control - Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="item"><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI ProgressBar Control - Functional Examples" href="../../examples/progressbar/index.html">ProgressBar</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="item"><a title="The YUI Storage Utility - Functional Examples" href="../../examples/storage/index.html">Storage</a></li><li class="item"><a title="The YUI SWF Utility - Functional Examples" href="../../examples/swf/index.html">SWF</a></li><li class="item"><a title="The YUI SWFStore Utility - Functional Examples" href="../../examples/swfstore/index.html">SWFStore</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="item"><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="item"><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - Functional Examples" href="../../examples/reset/index.html">Reset CSS</a></li><li class="item"><a title="YUI Base CSS - Functional Examples" href="../../examples/base/index.html">Base CSS</a></li><li class="item"><a title="YUI Fonts CSS - Functional Examples" href="../../examples/fonts/index.html">Fonts CSS</a></li><li class="item"><a title="YUI Grids CSS - Functional Examples" href="../../examples/grids/index.html">Grids CSS</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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</div>
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</div>
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</div><!--closes bd-->
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<div id="ft">
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<p class="first">Copyright © 2010 Yahoo! Inc. All rights reserved.</p>
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