| author | Eugene Ostroukhov <eugeneo@symbian.org> |
| Wed, 28 Jul 2010 09:27:51 -0700 | |
| changeset 455 | 5da55957c779 |
| 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="Creating a widget that uses the WRTKit" /> |
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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-8D71EE32-1826-4141-8FB6-76420A5472A4" 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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Creating a widget that uses the WRTKit</title> |
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</head> |
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<body id="GUID-8D71EE32-1826-4141-8FB6-76420A5472A4"><a name="GUID-8D71EE32-1826-4141-8FB6-76420A5472A4"><!-- --></a> |
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<h1 class="topictitle1"> |
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Creating a widget that uses the WRTKit</h1> |
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<div> |
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<p> |
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To create a widget the uses the WRTKit for its user interface, start by copying |
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the WRTKit directory from the Library directory in the WRTKit to the root |
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directory of the widget you are making. The root directory of your widget is |
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the directory where your Info.plist and main HTML file is located. |
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</p> |
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<p> |
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The main HTML file should include a script tag that loads the file |
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WRTKit/WRTKit.js in order to include and initialize the WRTKit library in your |
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widget. The widget typically should have no content at all between its |
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<body> and </body> tags. You also want to include the JavaScript |
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script file where your own widget's code is located, and you want to define some |
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entry point function that gets called when the widget is loaded, e.g. using the |
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onload event that you can define for the body tag. This should result in an HTML |
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file that looks something like this: |
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</p> |
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<pre> |
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<?xml version="1.0" encoding="UTF-8"?> |
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
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<html xmlns="http://www.w3.org/1999/xhtml"> |
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<head> |
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<title></title> |
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<script type="text/javascript" src="WRTKit/WRTKit.js"></script> |
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<script type="text/javascript" src="YourOwnWidgetCode.js"></script> |
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</head> |
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<body onload="init()"> |
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</body> |
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</html> |
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</pre> |
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<p> |
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In this example the code for your own widget is in a file called YourOwnWidgetCode.js |
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and the entry point function that gets called when the widget has loaded all files is |
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called init(). Next, we want to create that function. |
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</p> |
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<p> |
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All widgets that use the WRTKit need to create an instance of the UIManager class, as |
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well as at least one view. Creating the UIManager is a simple matter of instantiating |
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the WRTKit UIManager class. You should retain the reference to that instance in a |
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global variable or some other place that is accessible to the code that will need to |
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use the UIManager's services. To do this, you would first declare the global variable |
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to hold your UIManager instance: |
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</p> |
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<pre> |
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// Reference to the user interface manager. |
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var uiManager; |
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</pre> |
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<p> |
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With the variable declared you can then add the following code to the init() function |
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to create an instance of the UIManager class and retain a reference to that instance |
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in the uiManager variable: |
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</p> |
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<pre> |
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// create the user interface manager |
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uiManager = new UIManager(); |
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</pre> |
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<p> |
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Now that we have a user interface manager instance we can create a new view and set it |
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to the screen. In order to be able to access that view outside the init() function, we |
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should crate a global variable for it just like we did for the UIManager instance: |
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</p> |
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<pre> |
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// Reference to the main view. |
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var mainView; |
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</pre> |
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<p> |
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In this example we will create a ListView that has a unique identifier "example" and |
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a view caption "Example View". The unique identifier can be used to set CSS rules that |
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are targeted to a particular view. It is often not needed and can be specified as null. |
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The view caption is shown at the top of list views and is helpful to show users what |
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the view is for. |
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</p> |
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118 |
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<pre> |
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120 |
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// create the main view |
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mainView = new ListView("example", "Example View");
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</pre> |
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124 |
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<p> |
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126 |
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We are now ready to command the view to the screen: |
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</p> |
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129 |
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<pre> |
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131 |
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// show the mainView |
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uiManager.setView(mainView); |
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</pre> |
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135 |
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<p> |
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137 |
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The example widget would now be displaying an empty list view with "Example View" in |
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its view caption and would be ready for more functionality. Let's add a button to the |
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view. You would normally do this before the view is shown. Our example button has a |
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unique identifier "exampleButton" and text "Press me!" on the face of the button. |
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</p> |
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143 |
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<pre> |
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145 |
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// add a button to the main view |
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var exampleButton = new FormButton("exampleButton", "Press me!");
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mainView.addControl(exampleButton); |
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</pre> |
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150 |
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<p> |
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152 |
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The main view now contains a button. If we wanted to be informed when the button is |
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pressed we could create a new function and register it as an "event listener". First |
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the callback function definition: |
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</p> |
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157 |
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<pre> |
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159 |
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// Callback function that gets called when the example button is pressed. |
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function exampleButtonPressed(event) {
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// popup a notification dialog when the button is pressed |
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uiManager.showNotification(3000, "info", "You pressed the button!"); |
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} |
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</pre> |
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166 |
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<p> |
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168 |
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Now that we have a function to call when the button is pressed we can register the |
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event listener. You should write this code in the init() function, for example right |
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after you created the button: |
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</p> |
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173 |
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<pre> |
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175 |
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// add an event listener |
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exampleButton.addEventListener("ActionPerformed", exampleButtonPressed);
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</pre> |
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179 |
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<p> |
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181 |
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The same idea applies even to much more complex user interfaces. You create views and |
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controls, add the controls to the views, command a view to be displayed using the |
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UIManager, and get notified of user actions using event listeners that you can |
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register to the controls. |
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</p> |
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187 |
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</div> |
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189 |
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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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195 |
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</body> |
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</html> |