Symbian.org/WRTKit/UI/Label.js
author John Kern <johnk@symbian.org>
Fri, 17 Jul 2009 15:52:45 -0700
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checking in an application written by Ivan Litovski. If you're going to OSCon, this is a must.
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/*
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� Copyright 2008 Nokia Corporation. All rights reserved.
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IMPORTANT:  The Nokia software ("WRTKit and Example Widget files") is supplied to you by Nokia
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Corporation (�Nokia�) in consideration of your agreement to the following terms. Your use, installation
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and/or redistribution of the WRTKit and Example Widget files constitutes acceptance of these terms. If
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you do not agree with these terms, please do not use, install, or redistribute the WRTKit and Example
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Widget files.
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In consideration of your agreement to abide by the following terms, and subject to these terms, Nokia
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grants you a personal, non-exclusive license, under Nokia�s copyrights in the WRTKit and Example
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Widget files, to use, reproduce, and redistribute the WRTKit and Example files, in text form (for HTML,
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CSS, or JavaScript files) or binary form (for associated images), for the sole purpose of creating S60
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Widgets.
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If you redistribute the WRTKit and Example files, you must retain this entire notice in all such
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redistributions of the WRTKit and Example files.
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You may not use the name, trademarks, service marks or logos of Nokia to endorse or promote products
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that include the WRTKit and Example files without the prior written explicit agreement with Nokia.
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Except as expressly stated in this notice, no other rights or licenses, express or implied, are granted by
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Nokia herein, including but not limited to any patent rights that may be infringed by your products that
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incorporate the WRTKit and Example files or by other works in which the WRTKit and Example files
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may be incorporated.
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The WRTKit and Example files are provided on an "AS IS" basis.  NOKIA MAKES NO
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WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
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WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE, REGARDING THE EXAMPLES OR ITS USE AND OPERATION
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ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
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IN NO EVENT SHALL NOKIA BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, AND/OR
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DISTRIBUTION OF THE EXAMPLES, HOWEVER CAUSED AND WHETHER UNDER THEORY
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OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE,
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EVEN IF NOKIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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///////////////////////////////////////////////////////////////////////////////
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// The Label class implements a control that displays textual content.
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// Constructor.
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function Label(id, caption, text) {
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    if (id != UI_NO_INIT_ID) {
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        this.init(id, caption, text);
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    }
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}
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// Label inherits from Control.
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Label.prototype = new Control(UI_NO_INIT_ID);
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// Content element for label text.
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Label.prototype.contentElement = null;
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// Initializer - called from constructor.
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Label.prototype.init = function(id, caption, text) {
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    uiLogger.debug("Label.init(" + id + ", " + caption + ", " + text + ")");
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    // call superclass initializer
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    Control.prototype.init.call(this, id, caption);
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    // create content element
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    this.contentElement = document.createElement("div");
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    this.controlElement.appendChild(this.contentElement);
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    // set the text
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    this.setText(text);
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}
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// Returns the enabled state for the control.
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Label.prototype.isEnabled = function() {
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    return true;
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}
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// Returns the focusable state for the control.
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Label.prototype.isFocusable = function() {
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    return false;
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}
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// Returns the control text.
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Label.prototype.getText = function() {
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    return this.contentElement.innerHTML;
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}
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// Sets the text for the control.
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Label.prototype.setText = function(text) {
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    uiLogger.debug("Label.setText(" + text + ")");
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    this.contentElement.innerHTML = (text == null) ? "" : text;
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    this.updateStyleFromState();
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}
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// Updates the style of the control to reflects the state of the control.
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Label.prototype.updateStyleFromState = function() {
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    uiLogger.debug("Label.updateStyleFromState()");
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    // set element class names
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    this.setClassName(this.rootElement, "Control");
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    this.setClassName(this.assemblyElement, "ControlAssembly ControlAssemblyNormal");
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    this.setClassName(this.captionElement, "ControlCaption ControlCaptionNormal");
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    this.setClassName(this.controlElement, "ControlElement");
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    this.setClassName(this.contentElement, "LabelText");
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}