/*

© 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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Widgets.

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*/

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

// The NavigationButton class implements a button control for use in

// navigational contexts in menu-style UIs.

// Constructor.

function NavigationButton(id, image, text) {

    if (id != UI_NO_INIT_ID) {

        this.init(id, image, text);

    }

}

// NavigationButton inherits from ActionControl.

NavigationButton.prototype = new ActionControl(UI_NO_INIT_ID);

// Button table element.

NavigationButton.prototype.tableElement = null;

// Button table row element.

NavigationButton.prototype.tableRowElement = null;

// Button table left cell element.

NavigationButton.prototype.tableLeftCellElement = null;

// Button table right cell element.

NavigationButton.prototype.tableRightCellElement = null;

// Button image element.

NavigationButton.prototype.imageElement = null;

// Button link element.

NavigationButton.prototype.linkElement = null;

// Button text element.

NavigationButton.prototype.textElement = null;

// Initializer - called from constructor.

NavigationButton.prototype.init = function(id, image, text) {

    uiLogger.debug("NavigationButton.init(" + id + ", " + image + ", " + text + ")");

    // call superclass initializer

    ActionControl.prototype.init.call(this, id, null);

    // remove caption element

    this.assemblyElement.removeChild(this.captionElement);

    // construct the button

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

    this.tableElement = document.createElement("table");

    this.tableRowElement = document.createElement("tr");

    this.tableLeftCellElement = document.createElement("td");

    this.tableRightCellElement = document.createElement("td");

    this.imageElement = null;

    this.linkElement = document.createElement("a");

    this.linkElement.href = "JavaScript:void(0)";

    this.textElement = document.createElement("span");

    this.tableElement.appendChild(this.tableRowElement);

    this.tableRowElement.appendChild(this.tableLeftCellElement);

    this.tableRowElement.appendChild(this.tableRightCellElement);

    this.tableRightCellElement.appendChild(this.linkElement);

    this.linkElement.appendChild(this.textElement);

    this.buttonElement.appendChild(this.tableElement);

    this.controlElement.appendChild(this.buttonElement);

    // set the image and text

    this.setImage(image);

    this.setText(text);

    // bind event listeners

    this.bindActionControlListeners();

    // update the style

    this.updateStyleFromState();

}

// Sets the enabled state.

NavigationButton.prototype.setEnabled = function(enabled) {

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

    // bail out early if there is no change in state

    if (this.enabled == enabled) {

        return;

    }

    // set the enabled state

    this.enabled = enabled;

    if (this.enabled) {

        // diabled -> enabled

        this.tableRightCellElement.removeChild(this.textElement);

        this.tableRightCellElement.appendChild(this.linkElement);

        this.linkElement.appendChild(this.textElement);

    } else {

        // enabled -> diabled

        this.linkElement.removeChild(this.textElement);

        this.tableRightCellElement.removeChild(this.linkElement);

        this.tableRightCellElement.appendChild(this.textElement);

    }

    // update the style

    this.updateStyleFromState();

}

// Returns the button image (URL); null if none.

NavigationButton.prototype.getImage = function() {

    return (this.imageElement != null) ? this.imageElement.src : null;

}

// Sets the button image (URL); null if none.

NavigationButton.prototype.setImage = function(image) {

    uiLogger.debug("NavigationButton.setImage(" + image + ")");

    if (image == null) {

        // remove image - if any

        if (this.imageElement != null) {

            this.tableLeftCellElement.removeChild(this.imageElement);

        }

    } else {

        // default to not append image element

        var append = false;

        // create image element if one doesn't exist

        if (this.imageElement == null) {

            this.imageElement = document.createElement("img");

            this.imageElement.setAttribute("alt", "");

            append = true;

        }

        // set image source URL

        this.imageElement.src = image;

        // append the image element to the left cell?

        if (append) {

            this.tableLeftCellElement.appendChild(this.imageElement);

        }

    }

}

// Returns the button text.

NavigationButton.prototype.getText = function() {

    return this.textElement.innerHTML;

}

// Sets the button text.

NavigationButton.prototype.setText = function(text) {

    uiLogger.debug("NavigationButton.setText(" + text + ")");

    this.textElement.innerHTML = (text == null) ? "" : text;;

}

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

NavigationButton.prototype.updateStyleFromState = function() {

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

    // determine the state name

    var stateName = this.getStyleStateName();

    // set root element class name

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

    // set the control assembly class names

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

    // control element

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

    // set the button table class names

    this.setClassName(this.buttonElement, "NavigationButton");

    this.setClassName(this.tableElement, "NavigationButtonTable");

    this.setClassName(this.tableRowElement, "NavigationButtonRow");

    this.setClassName(this.tableLeftCellElement, "NavigationButtonImageCell");

    this.setClassName(this.tableRightCellElement, "NavigationButtonTextCell");

    // set image class names

    if (this.imageElement) {

        this.setClassName(this.imageElement, "NavigationButtonImage");

    }

    // set the button text class name

    this.setClassName(this.textElement, "NavigationButtonText NavigationButtonText" + stateName);

}