/*

© Copyright 2008 Nokia Corporation. All rights reserved.

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

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*/

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

// The SelectionControl class is an abstract base class for controls that lets

// the user select one or more options from a list of options. Don't use

// SelectionControl directly.

// Constructor.

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

    if (id != UI_NO_INIT_ID) {

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

    }

}

// SelectionControl inherits from Control.

SelectionControl.prototype = new Control(UI_NO_INIT_ID);

// List of options.

SelectionControl.prototype.options = null;

// The single selected option in single selection controls

// or list of options in multi selection controls.

SelectionControl.prototype.selected = null;

// Single or multiple selection.

SelectionControl.prototype.multipleSelection = false;

// Initializer - called from constructor.

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

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

    // call superclass initializer

    Control.prototype.init.call(this, id, caption);

    // set the multiple selection property

    this.multipleSelection = multipleSelection;

    // init options and selected (makes copies of the original arrays)

    this.options = (options != null) ? options.slice(0) : [];

    if (multipleSelection) {

        this.selected = (selected == null) ? [] : selected.slice(0);

    } else {

        this.selected = selected;

    }

    this.validateSelected();

}

// Returns true if the control is a multiple selection control; false if single.

SelectionControl.prototype.isMultipleSelection = function() {

    return this.multipleSelection;

}

// Returns true if the specified option is selected; false if not.

SelectionControl.prototype.isSelected = function(option) {

    if (this.multipleSelection) {

        // multiple selection

        // iterate through all selected options and look for the specified option

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

            if (this.selected[i] == option) {

                return true;

            }

        }

        return false;

    } else {

        // single selection

        return (this.selected == option);

    }

}

// Returns the currently selected option in a single selection control or

// an array of selected options in a multiple selection control. If there are

// no selected options a single selection control returns null and a multiple

// selection control returns an empty array.

SelectionControl.prototype.getSelected = function() {

    return this.multipleSelection ? this.selected.slice(0) : this.selected;

}

// 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.

// Override in sublcasses to provide full implementation.

SelectionControl.prototype.setSelected = function(selected) {

    this.selected = this.multipleSelection ? selected.slice(0) : selected;

    // make sure the selected option or options are legal

    this.validateSelected();

}

// Ensures that the selected option or options exist among the options in this control.

SelectionControl.prototype.validateSelected = function() {

    if (this.multipleSelection) {

        // multiple selection

        // iterate through all selected options and ensure they exist among the options

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

            // check that the selected option exists among the options

            var found = false;

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

                if (this.options[j] == this.selected[i]) {

                    // found - stop looking for this option

                    found = true;

                    break;

                }

            }

            // not found - remove this selected element

            if (!found) {

                this.selected.splice(i, 1);

                // since we removed an entry we must re-check this position

                i--;

            }

        }

    } else {

        // single selection

        if (this.selected != null) {

            // check that the selected option exists among the options

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

                if (this.options[i] == this.selected) {

                    // found - we're done

                    return;

                }

            }

            // not found - remove the selection

            this.selected = null;

        }

    }

}

// Returns the options in the control as an array of option objects with

// a value and text property.

SelectionControl.prototype.getOptions = function() {

    return this.options;

}

// Sets the options in the control.

// Override in sublcasses to provide full implementation.

SelectionControl.prototype.setOptions = function(options) {

    this.options = options.slice(0);

    // make sure the selected option or options are legal

    this.validateSelected();

}

// Returns the option that has the specified value; null if none.

SelectionControl.prototype.getOptionForValue = function(value) {

    // iterate through all options and look for a match

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

        if (this.options[i].value == value) {

            return this.options[i];

        }

    }

    return null;

}