/*

File: FancyToolbar.js

Abstract: JavaScript for the FancyToolbar

Version: 1.0

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*/

// Helper function to remove a className

Element.prototype.removeStyleClass = function(className) 

{

    if (this.hasStyleClass(className))

        this.className = this.className.replace(className, "");

}

// Helper function to add a className

Element.prototype.addStyleClass = function(className) 

{

    if (!this.hasStyleClass(className))

        this.className += (this.className.length ? " " + className : className);

}

// Helper function to test if a element has a className

Element.prototype.hasStyleClass = function(className) 

{

    return this.className.indexOf(className) !== -1;

}

// FancyToolbar: constructor function, takes an iframe

function FancyToolbar(iframe)

{

    this.setupNeeded = true;

    this.editArea = iframe;

    // add event listeners to show and hide when the iframe is focused and blurred

    var toolbar = this;

    iframe.contentDocument.defaultView.addEventListener("focus", function(event) { toolbar.show() }, false);

    iframe.contentDocument.defaultView.addEventListener("blur", function(event) { toolbar.hide() }, false);

}

// FancyToolbar: mouse down event handler

FancyToolbar.prototype.toolbarMouseDown = function(event)

{

    this.clickingToolbar = true;

}

// FancyToolbar: mouse up event handler

FancyToolbar.prototype.toolbarMouseUp = function(event)

{

    // refocus the editing area

    this.editArea.contentDocument.defaultView.focus();

    this.clickingToolbar = false;

}

// FancyToolbar: setup and create the DOM elements for the toolbar

FancyToolbar.prototype.setupIfNeeded = function()

{

    if (!this.setupNeeded)

        return;

    delete this.setupNeeded;

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

    var toolbar = this;

    this.toolbarElement.addEventListener("mousedown", function(event) { toolbar.toolbarMouseDown(event); }, false);

    this.toolbarElement.addEventListener("mouseup", function(event) { toolbar.toolbarMouseUp(event); }, false);

    var toolbarArea = document.createElement("div");

    toolbarArea.className = "fancy-toolbar-area";

    this.boldButton = document.createElement("button");

    this.boldButton.className = "fancy-toolbar-button fancy-toolbar-button-bold";

    this.boldButton.addEventListener("click", function(event) { toolbar.boldSelection(event); }, false);

    toolbarArea.appendChild(this.boldButton);

    this.underlineButton = document.createElement("button");

    this.underlineButton.className = "fancy-toolbar-button fancy-toolbar-button-underline";

    this.underlineButton.addEventListener("click", function(event) { toolbar.underlineSelection(event); }, false);

    toolbarArea.appendChild(this.underlineButton);

    this.italicButton = document.createElement("button");

    this.italicButton.className = "fancy-toolbar-button fancy-toolbar-button-italic";

    this.italicButton.addEventListener("click", function(event) { toolbar.italicSelection(event); }, false);

    toolbarArea.appendChild(this.italicButton);

    this.textAlignLeftButton = document.createElement("button");

    this.textAlignLeftButton.className = "fancy-toolbar-button-segment fancy-toolbar-button-segment-start fancy-toolbar-button-selected";

    this.textAlignLeftButton.addEventListener("click", function(event) { toolbar.textAlignLeft(event); }, false);

    toolbarArea.appendChild(this.textAlignLeftButton);

    var cap = document.createElement("div");

    cap.className = "fancy-toolbar-button-segment-cap";

    this.textAlignLeftButton.appendChild(cap);

    var middle = document.createElement("div");

    middle.className = "fancy-toolbar-button-segment-middle";

    this.textAlignLeftButton.appendChild(middle);

    var align = document.createElement("div");

    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-left";

    middle.appendChild(align);

    var divider = document.createElement("div");

    divider.className = "fancy-toolbar-button-segment-divider";

    this.textAlignLeftButton.appendChild(divider);

    this.textAlignCenterButton = document.createElement("button");

    this.textAlignCenterButton.className = "fancy-toolbar-button-segment";

    this.textAlignCenterButton.addEventListener("click", function(event) { toolbar.textAlignCenter(event); }, false);

    toolbarArea.appendChild(this.textAlignCenterButton);

    middle = document.createElement("div");

    middle.className = "fancy-toolbar-button-segment-middle";

    this.textAlignCenterButton.appendChild(middle);

    align = document.createElement("div");

    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-center";

    middle.appendChild(align);

    divider = document.createElement("div");

    divider.className = "fancy-toolbar-button-segment-divider";

    this.textAlignCenterButton.appendChild(divider);

    this.textAlignJustifyButton = document.createElement("button");

    this.textAlignJustifyButton.className = "fancy-toolbar-button-segment";

    this.textAlignJustifyButton.addEventListener("click", function(event) { toolbar.textAlignJustify(event); }, false);

    toolbarArea.appendChild(this.textAlignJustifyButton);

    middle = document.createElement("div");

    middle.className = "fancy-toolbar-button-segment-middle";

    this.textAlignJustifyButton.appendChild(middle);

    align = document.createElement("div");

    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-justify";

    middle.appendChild(align);

    divider = document.createElement("div");

    divider.className = "fancy-toolbar-button-segment-divider";

    this.textAlignJustifyButton.appendChild(divider);

    this.textAlignRightButton = document.createElement("button");

    this.textAlignRightButton.className = "fancy-toolbar-button-segment fancy-toolbar-button-segment-end";

    this.textAlignRightButton.addEventListener("click", function(event) { toolbar.textAlignRight(event); }, false);

    toolbarArea.appendChild(this.textAlignRightButton);

    middle = document.createElement("div");

    middle.className = "fancy-toolbar-button-segment-middle";

    this.textAlignRightButton.appendChild(middle);

    align = document.createElement("div");

    align.className = "fancy-toolbar-button-text-align fancy-toolbar-button-text-align-right";

    middle.appendChild(align);

    cap = document.createElement("div");

    cap.className = "fancy-toolbar-button-segment-cap";

    this.textAlignRightButton.appendChild(cap);

    this.linkButton = document.createElement("button");

    this.linkButton.className = "fancy-toolbar-button fancy-toolbar-button-link";

    this.linkButton.addEventListener("click", function(event) { toolbar.linkSelection(event); }, false);

    toolbarArea.appendChild(this.linkButton);

    var img = document.createElement("img");

    this.linkButton.appendChild(img);

    this.imageButton = document.createElement("button");

    this.imageButton.className = "fancy-toolbar-button fancy-toolbar-button-image";

    this.imageButton.addEventListener("click", function(event) { toolbar.insertImage(event); }, false);

    toolbarArea.appendChild(this.imageButton);

    img = document.createElement("img");

    toolbar.imageButton.appendChild(img);

    this.toolbarElement.appendChild(toolbarArea);

    this.toolbarElement.className = "fancy-toolbar-bezel";

    // set the opacity to 0 to start with

    this.toolbarElement.style.opacity = "0";

}

// FancyToolbar: show the toolbar

FancyToolbar.prototype.show = function()

{

    if (this.showing)

        return;

    this.showing = true;

    this.setupIfNeeded();

    // add the toolbar element to the body

    document.body.appendChild(this.toolbarElement);

    // resize the toolbar element to match the iframe

    this.adjustSize();

    // make the zindex 100 to pop the iframe out

    this.editArea.style.zIndex = "100";

    // add the event listeners we need

    this.updateToolbarListener = function(event) { toolbar.updateToolbarButtonStates(toolbar) };

    this.windowResizeListener = function(event) { toolbar.windowResize(event) };

    this.editArea.contentDocument.addEventListener("mouseup", this.updateToolbarListener, false);

    this.editArea.contentDocument.addEventListener("mousemove", this.updateToolbarListener, false);

    this.editArea.contentDocument.addEventListener("keypress", this.updateToolbarListener, false);

    window.addEventListener("resize", this.windowResizeListener, false);

    // start the toolbar fading in

    var toolbar = this;

    setTimeout(function() { toolbar.animateToolbar(1.0) }, 30);

}

// FancyToolbar: hide the toolbar

FancyToolbar.prototype.hide = function()

{

    if (this.clickingToolbar)

        return;

    this.showing = false;

    // start the toolbar fading out

    var toolbar = this;

    setTimeout(function() { toolbar.animateToolbar(0.0) }, 30);

}

// FancyToolbar: hidden function called when the toolbar fade ends

FancyToolbar.prototype.hidden = function()

{

    // remove the event listeners we don't need anymore

    this.editArea.contentDocument.removeEventListener("mouseup", this.updateToolbarListener, false);

    this.editArea.contentDocument.removeEventListener("mousemove", this.updateToolbarListener, false);

    this.editArea.contentDocument.removeEventListener("keypress", this.updateToolbarListener, false);

    window.removeEventListener("resize", this.windowResizeListener, false);

    // remove the toolbar element

    this.toolbarElement.parentNode.removeChild(this.toolbarElement);

    // remove the zindex we added

    this.editArea.style.zIndex = null;

}

// FancyToolbar: update the toolbar button states

FancyToolbar.prototype.updateToolbarButtonStates = function()

{

    var doc = this.editArea.contentDocument;

    // check the Bold state

    if (doc.queryCommandState("Bold"))

        this.boldButton.addStyleClass("fancy-toolbar-button-selected");

    else

        this.boldButton.removeStyleClass("fancy-toolbar-button-selected");

    // check the Underline state

    if (doc.queryCommandState("Underline"))

        this.underlineButton.addStyleClass("fancy-toolbar-button-selected");

    else

        this.underlineButton.removeStyleClass("fancy-toolbar-button-selected");

    // check the Italic state

    if (doc.queryCommandState("Italic"))

        this.italicButton.addStyleClass("fancy-toolbar-button-selected");

    else

        this.italicButton.removeStyleClass("fancy-toolbar-button-selected");

}

// FancyToolbar: link button event handler

FancyToolbar.prototype.linkSelection = function(event)

{

    // prompt the user for a URL

    var value = prompt("Enter link URL:", "");

    this.editArea.contentDocument.execCommand("CreateLink", false, value);

}

// FancyToolbar: image button event handler

FancyToolbar.prototype.insertImage = function(event)

{

    // prompt the user for a URL

    var value = prompt("Enter image URL:", "");

    this.editArea.contentDocument.execCommand("InsertImage", false, value);

}

// FancyToolbar: bold button event handler

FancyToolbar.prototype.boldSelection = function(event)

{

    this.editArea.contentDocument.execCommand("Bold");

    this.updateToolbarButtonStates();

}

// FancyToolbar: underline button event handler

FancyToolbar.prototype.underlineSelection = function(event)

{

    this.editArea.contentDocument.execCommand("Underline");

    this.updateToolbarButtonStates();

}

// FancyToolbar: italic button event handler

FancyToolbar.prototype.italicSelection = function(event)

{

    this.editArea.contentDocument.execCommand("Italic");

    this.updateToolbarButtonStates();

}

// FancyToolbar: text align left button event handler

FancyToolbar.prototype.textAlignLeft = function(event)

{

    this.editArea.contentDocument.execCommand("JustifyLeft");

    // enable the left text align button, disable all other toolbar text align buttons

    this.textAlignLeftButton.addStyleClass("fancy-toolbar-button-selected");

    this.textAlignCenterButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignJustifyButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignRightButton.removeStyleClass("fancy-toolbar-button-selected");

}

// FancyToolbar: text align center button event handler

FancyToolbar.prototype.textAlignCenter = function(event)

{

    this.editArea.contentDocument.execCommand("JustifyCenter");

    // enable the center text align button, disable all other toolbar text align buttons

    this.textAlignLeftButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignCenterButton.addStyleClass("fancy-toolbar-button-selected");

    this.textAlignJustifyButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignRightButton.removeStyleClass("fancy-toolbar-button-selected");

}

// FancyToolbar: text align justify button event handler

FancyToolbar.prototype.textAlignJustify = function(event)

{

    this.editArea.contentDocument.execCommand("JustifyFull");

    // enable the justify text align button, disable all other toolbar text align buttons

    this.textAlignLeftButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignCenterButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignJustifyButton.addStyleClass("fancy-toolbar-button-selected");

    this.textAlignRightButton.removeStyleClass("fancy-toolbar-button-selected");

}

// FancyToolbar: text align right button event handler

FancyToolbar.prototype.textAlignRight = function(event)

{

    this.editArea.contentDocument.execCommand("JustifyRight");

    // enable the right text align button, disable all other toolbar text align buttons

    this.textAlignLeftButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignCenterButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignJustifyButton.removeStyleClass("fancy-toolbar-button-selected");

    this.textAlignRightButton.addStyleClass("fancy-toolbar-button-selected");

}

// FancyToolbar: adjust the size of the toolbar bezel to match the iframe

FancyToolbar.prototype.adjustSize = function()

{

    this.toolbarElement.style.top = (this.editArea.offsetTop - 55) + "px";

    this.toolbarElement.style.left = (this.editArea.offsetLeft - 26) + "px";

    this.toolbarElement.style.width = this.editArea.offsetWidth + "px";

    this.toolbarElement.style.height = this.editArea.offsetHeight + "px";

}

// FancyToolbar: window resize event handler

FancyToolbar.prototype.windowResize = function(event)

{

    // call the adjustSize function after a delay to make sure the iframe has fully resized

    var toolbar = this;

    setTimeout(function() { toolbar.adjustSize() }, 0);

}

// FancyToolbar: fade animation function

FancyToolbar.prototype.animateToolbar = function(targetOpacity) {

    // increment or decrement the opacity depending on the target opacity

    if (this.toolbarElement.style.opacity < targetOpacity)

        this.toolbarElement.style.opacity = parseFloat(this.toolbarElement.style.opacity) + 0.1;

    else if (this.toolbarElement.style.opacity > targetOpacity)

        this.toolbarElement.style.opacity = parseFloat(this.toolbarElement.style.opacity) - 0.1;

    if (this.toolbarElement.style.opacity != targetOpacity) {

        // the opacity not yet the target opacity, keep animating

        var toolbar = this;

        setTimeout(function() { toolbar.animateToolbar(targetOpacity) }, 10);

        return;

    }

    // the opacity is now 0, so call the hidden function

    if (targetOpacity === 0.0)

        this.hidden();

}

window.addEventListener("load", function() {

    // find all the iframes

    var iframes = document.getElementsByTagName("iframe");

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

        var iframe = iframes[i];

        if (!iframe.hasStyleClass("editable"))

            continue;

        // enable editing and make a new FancyToolbar

        iframe.contentDocument.designMode = "on";

        iframe.fancyToolbar = new FancyToolbar(iframe);

    }

}, false);