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

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

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

// Constructor.

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

    if (id != UI_NO_INIT_ID) {

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

    }

}

// SelectionList inherits from SelectionControl.

SelectionList.prototype = new SelectionControl(UI_NO_INIT_ID);

// Root element for options.

SelectionList.prototype.optionListElement = null;

// Array for tracking option elements.

SelectionList.prototype.optionElements = null;

// Tracking for currently focused option; null if none.

SelectionList.prototype.focusedOption = null;

// Enabled status.

SelectionList.prototype.enabled = false;

// Initializer - called from constructor.

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

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

    // call superclass initializer

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

    // create option list element

    this.optionListElement = document.createElement("div");

    this.controlElement.appendChild(this.optionListElement);

    // the control defaults to enabled

    this.enabled = true;

    // init option element arrays

    this.optionElements = [];

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

    this.updateOptionElements();

}

// Returns the enabled state.

SelectionList.prototype.isEnabled = function() {

    return this.enabled;

}

// Sets the enabled state.

SelectionList.prototype.setEnabled = function(enabled) {

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

    // switch the state and update the the control

    this.enabled = enabled;

    this.updateOptionElements();

}

// Sets the focused state for the control.

// Note: This may not always succeed.

SelectionList.prototype.setFocused = function(focused) {

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

    if (this.enabled && this.optionElements.length > 0) {

        if (focused) {

            this.optionElements[0].link.focus();

        } else {

            this.optionElements[0].link.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.

SelectionList.prototype.setSelected = function(selected) {

    // call superclass setSelected()

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

    this.updateStyleFromState();

}

// Sets the options in the control.

SelectionList.prototype.setOptions = function(options) {

    // call superclass setOptions()

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

    this.updateOptionElements();

}

// Updates the option elements for the control element.

SelectionList.prototype.updateOptionElements = function() {

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

    // start by removing all current options from the option list element

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

        this.optionListElement.removeChild(this.optionListElement.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++) {

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

        var option = this.options[i];

        // option, link and text elements for this option

        var optionElement;

        var optionLinkElement;

        var optionTextElement;

        // get the elements

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

            // we need to create a new option element...

            optionElement = document.createElement("div");

            // ...and a new option link element...

            optionLinkElement = document.createElement("a");

            optionLinkElement.href = "JavaScript:void(0)";

            // ...and a new option text element

            optionTextElement = document.createElement("span");

            // hook up event listeners to the element

            var self = this;

            optionLinkElement.addEventListener("focus", function(event) { self.optionFocusStateChanged(event, true); }, false);

            optionLinkElement.addEventListener("blur", function(event) { self.optionFocusStateChanged(event, false); }, false);

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

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

            optionElement.addEventListener("mousedown", function(event) {

                                                               self.optionClicked(event)

                                                               event.stopPropagation();

                                                               event.preventDefault();

                                                        }, true);

            optionElement.addEventListener("keydown", function(event) {

                                                            // center and enter trigger the action

                                                            if (event.keyCode == 0 || event.keyCode == 13) {

                                                                self.optionClicked(event)

                                                                event.stopPropagation();

                                                                event.preventDefault();

                                                            }

                                                      }, true);

            // add the elements to the option element array

            this.optionElements.push({ option: optionElement, link: optionLinkElement, text: optionTextElement });

        } else {

            // we already have ready elements so we'll reuse them

            optionElement = this.optionElements[i].option;

            optionLinkElement = this.optionElements[i].link;

            optionTextElement = this.optionElements[i].text;

            // remove the option link element from its current parent - if any

            if (optionLinkElement.parentNode != null) {

                optionLinkElement.parentNode.removeChild(optionLinkElement);

            }

            // remove the option text element from its current parent - if any

            if (optionTextElement.parentNode != null) {

                optionTextElement.parentNode.removeChild(optionTextElement);

            }

        }

        // set the option text

        optionTextElement.innerHTML = option.text;

        // hook up the option to the control

        if (this.enabled) {

            // add the option link element to the option element

            optionElement.appendChild(optionLinkElement);

            // add the text element to the option element

            optionLinkElement.appendChild(optionTextElement);

        } else {

            // add the text element directly to the control element

            optionElement.appendChild(optionTextElement);

        }

        // add the option element to the option list element

        this.optionListElement.appendChild(optionElement);

    }

    // update the style

    this.updateStyleFromState();

}

// Callback for focus state change events.

SelectionList.prototype.optionFocusStateChanged = function(event, focused) {

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

    // get the event source option

    var option = null;

    var optionElement = null;

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

        optionElement = this.optionElements[i];

        if (optionElement.link == event.currentTarget) {

            option = this.options[i];

            break;

        }

    }

    // remember the focused option; or null if none is focused

    if (focused) {

        this.focusedOption = option;

    } else {

        this.focusedOption = null;

    }

    // call the superclass focus state change handler

    this.focusStateChanged(focused);

}

// Callback for clicks.

SelectionList.prototype.optionClicked = function(event) {

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

    // bail out if we're not enabled

    if (!this.enabled) {

        return false;

    }

    // get the changed option

    var option = null;

    var optionElement = null;

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

        optionElement = this.optionElements[i];

        if (optionElement.option == event.currentTarget) {

            option = this.options[i];

            break;

        }

    }

    // make sure the option is focused

    optionElement.link.focus();

    // toggle the selection

    if (this.multipleSelection) {

        // iterate through the selected options and see if this

        // option is selected. if not then add it to the selection.

        // if it already is selected then them remove it.

        var found = false;

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

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

                // remove from selected set

                found = true;

                this.selected.splice(i, 1);

                break;

            }

        }

        if (!found) {

            // add to the selected set

            this.selected.push(option);

        }

    } else {

        // update the selected option

        this.selected = option;

    }

    // update the style

    this.updateStyleFromState();

    // notify event listeners

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

}

// Resets the state tracking for focus and hover.

// Override this in subclasses as required to implement the state reset.

SelectionList.prototype.resetFocusState = function() {

    uiLogger.debug("SelectionList.resetFocusState()");

    this.hovering = false;

    this.focused = false;

    this.focusedOption = null;

    this.updateStyleFromState();

}

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

SelectionList.prototype.updateStyleFromState = function() {

    uiLogger.debug("SelectionList.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 option list and option class names

    this.setClassName(this.optionListElement, "SelectionList SelectionList" + stateName);

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

        var option = this.options[i];

        // get the option and option text elements for this option

        var optionElement = this.optionElements[i].option;

        var optionTextElement = this.optionElements[i].text;

        // figure out the option state

        var optionStateName = this.isSelected(option) ? "Checked" : "Unchecked";

        if (!this.enabled) {

            optionStateName += "Disabled";

        } else if (this.focusedOption == option) {

            optionStateName += "Focus";

        } else {

            optionStateName += "Normal";

        }

        // set option element class names

        if (this.multipleSelection) {

            this.setClassName(optionElement, "SelectionListOptionMulti SelectionListOptionMulti" + optionStateName);

        } else {

            this.setClassName(optionElement, "SelectionListOptionSingle SelectionListOptionSingle" + optionStateName);

        }

        // set option text class names

        this.setClassName(optionTextElement, "SelectionListOptionText SelectionListOptionText" + stateName);

    }

}