| author | Eugene Ostroukhov <eugeneo@symbian.org> |
| Wed, 16 Jun 2010 16:41:16 -0700 | |
| changeset 382 | 0a04e9d28d78 |
| parent 230 | 7848c135d915 |
| permissions | -rw-r--r-- |
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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
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<html lang="en" xml:lang="en"> |
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<head> |
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type" /> |
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<meta name="copyright" content="(C) Copyright 2005" /> |
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<meta name="DC.rights.owner" content="(C) Copyright 2005" /> |
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<meta content="concept" name="DC.Type" /> |
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<meta name="DC.Title" content="Using buttons" /> |
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<meta scheme="URI" name="DC.Relation" content="WRTKit_Common_WRTKit_tasks-GUID-24870895-4449-4307-9a54-7c90f7b3905e.html" /> |
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<meta content="XHTML" name="DC.Format" /> |
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<meta content="GUID-8B14CEC9-92CC-4BDE-83C2-AD0A30A84942" name="DC.Identifier" /> |
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<meta content="en" name="DC.Language" /> |
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<link href="commonltr.css" type="text/css" rel="stylesheet" /> |
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<title> |
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Using buttons</title> |
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</head> |
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<body id="GUID-8B14CEC9-92CC-4BDE-83C2-AD0A30A84942"><a name="GUID-8B14CEC9-92CC-4BDE-83C2-AD0A30A84942"><!-- --></a> |
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<h1 class="topictitle1"> |
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Using buttons</h1> |
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<div> |
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<p> |
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You can let users trigger actions by placing a FormButton or |
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NavigationButton control in a view. Use FormButtons for actions that |
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start some process and NavigationButton controls for situations |
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where pressing the button should take the viewer to another view. |
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</p> |
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<div class="fignone" id="GUID-8B14CEC9-92CC-4BDE-83C2-AD0A30A84942__GUID-B008BB2B-C5B2-446D-BCED-2824528CF7CC"><a name="GUID-8B14CEC9-92CC-4BDE-83C2-AD0A30A84942__GUID-B008BB2B-C5B2-446D-BCED-2824528CF7CC"><!-- --></a><span class="figcap">Figure 1. |
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FormButton controls</span> |
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<br /><img src="FormButton_Controls_Screenshot_1.png" /><br /> |
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</div> |
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<p> |
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You can find out when a button has been pressed by registering a |
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callback function as an event listener to the button. The event type |
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for button presses is "ActionPerformed". You can use whatever name |
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you like for the callback function. The function is passed the event |
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object as an argument. A typical callback function looks like this: |
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</p> |
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<pre> |
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// Callback function for button presses. |
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function buttonPressed(event) {
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// implement what happens when the button is pressed here |
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} |
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</pre> |
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<p> |
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Creating a button, registering the event listener and adding the |
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button to a view is demonstrated below. The example creates a |
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FormButton: |
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</p> |
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<pre> |
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// create button |
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var button = new FormButton("button1", "Press me!");
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button.addEventListener("ActionPerformed", buttonPressed);
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exampleView.addControl(button); |
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</pre> |
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<p> |
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Note that the example assumes that a view has already been created |
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and that the "exampleView" variable refers to that view. "button1" |
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is a unique identifier for the button that allows it to be identified |
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for example if several different controls are using a shared event |
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listener function. The event listener function could examine the event |
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object and check the identifier of the source control for the event. |
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</p> |
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</div> |
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<div> |
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<div class="familylinks"> |
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<div class="parentlink"><strong>Parent topic:</strong> <a href="WRTKit_Common_WRTKit_tasks-GUID-24870895-4449-4307-9a54-7c90f7b3905e.html">Common WRTKit tasks</a></div> |
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</div> |
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</div> |
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</body> |
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</html> |