asp net mvc barcode scanner Figure 6-10 The ZoomToggle() plug-in being used on four different icons in Java

Generator EAN / UCC - 13 in Java Figure 6-10 The ZoomToggle() plug-in being used on four different icons

Figure 6-10 The ZoomToggle() plug-in being used on four different icons
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About the Plug-in
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This plug-in toggles the zoomed down state of an object If it is zoomed down then the object is restored to its original dimensions; otherwise, the object is zoomed down to zero width and height It requires the following arguments:
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An object, an object ID, or an array of objects and/or object IDs If true or 1, the object s width will be zoomed If true or 1, the object s height will be zoomed The number of milliseconds the animation should take
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If 0, the object will be moved during resizing so as to remain centered If greater than 0, the object will be padded with CSS padding to retain its original dimensions as it zooms down If 1, no padding will be applied and the object will not be moved during resizing
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If true (or 1), this plug-in can be interrupted by a new call on the same object; otherwise, if false (or 0), the call is uninterruptible
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Variables, Arrays, and Functions
j ZO_Flag ZO_Int Zoomdown ZoomDown() ZoomRestore() Local variable for indexing into id if it is an array Property of id that contains true if a zoom on id is in process Property of id that contains true if a zoom is interruptible Property of id that contains true if it has been zoomed down Plug-in to zoom an object down to zero width and height Plug-in to zoom an object back to its original dimensions
How It Works
This plug-in begins with the familiar code to iterate through id if it is an array and recursively call itself with each element to process it individually, as follows:
if (id instanceof Array) { for (var j = 0 ; j < idlength ; ++j) ZoomRestore(id[j], w, h, msecs, pad, interruptible, CB) return }
Next, the ZO_Flag property of id is tested If it is true, a zoom is currently in progress on id so the ZO_Int property is then tested If it is not true, the current zoom may not be interrupted, so the plug-in returns, using the following code:
if (O(id)ZO_Flag && !O(id)ZO_Int) return
6:
Movement and animation
The final two statements check the Zoomdown property of id If it is not true, the object is not zoomed down so the ZoomDown() plug-in is called; otherwise, the object is zoomed down so the ZoomRestore() plug-in is called, as follows:
if (!O(id)Zoomdown) ZoomDown(id, w, h, msecs, pad, interruptible, CB) else ZoomRestore(id, w, h, msecs, pad, interruptible, CB)
How To Use It
To use this plug-in, you don t need to keep track of an object s zoom down state because you can just call it and the plug-in will decide whether an object requires zooming down or up All you need to do is specify whether the zoom can occur in the horizontal or vertical direction (or both), the speed of the zoom, whether to pad the object, and if the zoom should be interruptible, like this:
ZoomToggle(myobject, 1, 0, 750, 0, 0)
This statement will toggle the zoom down state of the object myobject and allows the zoom to progress only on its width (so the object will appear to rotate about its vertical axis) The zoom will take 750 milliseconds, will not pad myobject, and is not interruptible The following example is similar to those in the last couple of plug-ins in that four icons are displayed and their zoom states can be controlled by passing the mouse in and out of them:
<img <img <img <img id='i1' id='i2' id='i3' id='i4' src='i6gif' src='i2gif' src='i1gif' src='i5gif' /> /> /> />
<script> windowonload = function() { ids = Array('i1', 'i2', 'i3', 'i4') ZoomToggle(Array('i1', 'i3'), 1, 1, 1, 1, 0) O(ids, 'onmouseover', 'toggle') O(ids, 'onmouseout', 'toggle') function toggle() { ZoomToggle(this, 1, 0, 500, 1, 1) } } </script>
There is an extra call to ZoomToggle() just after the ids array is assigned, which toggles the zoom down state of the first and third icons This means that the ZoomToggle() effect can be easily seen as you pass your mouse over the icons, and some zoom into view while others zoom down I have chosen to allow the zoom to occur only on an object s width so that the icons appear to be spinning around their vertical axes
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