/**

 * Copyright (c) 2009-2010 Symbian Foundation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Symbian Foundation - initial contribution.

 * Contributors:

 */

/*

IMPORTANT:  The Nokia software ("WRTKit and Example Widget files") is supplied to you by Nokia

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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, to use, reproduce, and redistribute the WRTKit and Example files, in text form (for HTML,

CSS, or JavaScript files) or binary form (for associated images), for the sole purpose of creating S60

Widgets.

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redistributions of the WRTKit and Example files.

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incorporate the WRTKit and Example files or by other works in which the WRTKit and Example files

may be incorporated.

The WRTKit and Example files are provided on an "AS IS" basis.  NOKIA MAKES NO

WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE, REGARDING THE EXAMPLES OR ITS USE AND OPERATION

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EVEN IF NOKIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

///////////////////////////////////////////////////////////////////////////////

// The SelectionMenu class implements a single or multi selection control

// that lets users select one or more options from a menu.

// Constructor.

function SelectionMenu(id, caption, options, multipleSelection, selected) {

    if (id != UI_NO_INIT_ID) {

        this.init(id, caption, options, multipleSelection, selected);

    }

}

// SelectionMenu inherits from SelectionControl.

SelectionMenu.prototype = new SelectionControl(UI_NO_INIT_ID);

// Reference to the peer HTML element.

SelectionControl.prototype.peerElement = null;

// Array for tracking option elements.

SelectionMenu.prototype.optionElements = null;

// Initializer - called from constructor.

SelectionMenu.prototype.init = function(id, caption, options, multipleSelection, selected) {

    uiLogger.debug("SelectionMenu.init(" + id + ", " + caption + ", " + options + ", " + multipleSelection + ", " + selected + ")");

    // call superclass initializer

    SelectionControl.prototype.init.call(this, id, caption, options, multipleSelection, selected);

    // create the control

    this.peerElement = document.createElement("select");

    this.peerElement.multiple = multipleSelection;

    this.controlElement.appendChild(this.peerElement);

    // init option elements array

    this.optionElements = [];

    // update the option elements to match the options in this control

    this.updateOptionElements();

    // bind event listeners

    var self = this;

    this.peerElement.addEventListener("focus", function() { self.focusStateChanged(true); }, false);

    this.peerElement.addEventListener("blur", function() { self.focusStateChanged(false); }, false);

    this.peerElement.addEventListener("mouseover", function() { self.hoverStateChanged(true); }, false);

    this.peerElement.addEventListener("mouseout", function() { self.hoverStateChanged(false); }, false);

    this.peerElement.addEventListener("change", function() { self.selectionChanged(); }, false);

};

// Returns the enabled state.

SelectionMenu.prototype.isEnabled = function() {

    return !this.peerElement.disabled;

};

// Sets the enabled state.

SelectionMenu.prototype.setEnabled = function(enabled) {

    uiLogger.debug("SelectionMenu.setEnabled(" + enabled + ")");

    this.peerElement.disabled = !enabled;

};

// Sets the focused state for the control.

// Note: This may not always succeed.

SelectionMenu.prototype.setFocused = function(focused) {

    uiLogger.debug("SelectionMenu.setFocused(" + focused + ")");

    if (focused) {

        this.peerElement.focus();

    } else {

        this.peerElement.blur();

    }

};

// Sets the currently selected options. Pass a single option in a single selection

// control or an array of selected controls in a multiple selection control. To

// deselect all options pass null in a single selection control and an empty array

// in a multiple selection control.

SelectionMenu.prototype.setSelected = function(selected) {

    // call superclass setSelected()

    SelectionControl.prototype.setSelected.call(this, selected);

    // iterate through the options and set the selected state

    // on the corresponding option element

    for (var i = 0; i < this.options.length; i++) {

        this.optionElements[i].selected = this.isSelected(this.options[i]);

    }

};

// Sets the options in the control.

SelectionMenu.prototype.setOptions = function(options) {

    // call superclass setOptions()

    SelectionControl.prototype.setOptions.call(this, options);

    this.updateOptionElements();

};

// Updates the option elements for the peer select element.

SelectionMenu.prototype.updateOptionElements = function() {

    // start by removing all current options from the select element

    while (this.peerElement.firstChild != null) {

        this.peerElement.removeChild(this.peerElement.firstChild);

    }

    // iterate through the options and add (and possibly create) a

    // properly configured option element for each option

    for (var i = 0; i < this.options.length; i++) {

        // do we need to create a new option element?

        if (i == this.optionElements.length) {

            this.optionElements.push(document.createElement("option"));

        }

        // get the option and option element we're working on

        var option = this.options[i];

        var optionElement = this.optionElements[i];

        // set the state for this option element and add it to the

        // peer select element

        optionElement.text = option.text;

        optionElement.selected = this.isSelected(option);

        this.peerElement.appendChild(optionElement);

    }

    // update the style

    this.updateStyleFromState();    

};

// Callback for selection change events.

SelectionMenu.prototype.selectionChanged = function() {

    uiLogger.debug("SelectionControl.selectionChanged()");

    // update the selected options array or reference

    this.selected = (this.multipleSelection) ? [] : null;

    for (var i = 0; i < this.options.length; i++) {

        if (this.optionElements[i].selected) {

            if (this.multipleSelection) {

                this.selected.push(this.options[i]);

            } else {

                this.selected = this.options[i];

                break;

            }

        }

    }

    // notify event listeners

    this.fireEvent(this.createEvent("SelectionChanged", this.getSelected()));

};

// Updates the style of the control to reflects the state of the control.

SelectionMenu.prototype.updateStyleFromState = function() {

    uiLogger.debug("SelectionMenu.updateStyleFromState()");

    // determine the state name

    var stateName = this.getStyleStateName();

    // set element class names

    this.setClassName(this.rootElement, "Control");

    this.setClassName(this.controlElement, "ControlElement");

    this.setClassName(this.assemblyElement, "ControlAssembly ControlAssembly" + stateName);

    this.setClassName(this.captionElement, "ControlCaption ControlCaption" + stateName);

    // set select and option element class names

    var peerStateName = this.isEnabled() ? stateName : "Disabled";

    this.setClassName(this.peerElement, "SelectionMenu SelectionMenu" + peerStateName);

    for (var i = 0; i < this.options.length; i++) {

        var option = this.optionElements[i];

        this.setClassName(option, "SelectionMenuOption SelectionMenuOption" + peerStateName);

    }

};