/
HelpScreen.js
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/
HelpScreen.js
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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
WebInspector.HelpScreen = function(title)
{
this._addStyleSheetIfNeeded("helpScreen.css");
this._element = document.createElement("div");
this._element.className = "help-window-outer";
this._element.addEventListener("keydown", this._onKeyDown.bind(this), false);
var mainWindow = this._element.createChild("div", "help-window-main");
var captionWindow = mainWindow.createChild("div", "help-window-caption");
var closeButton = captionWindow.createChild("button", "help-close-button");
this.contentElement = mainWindow.createChild("div", "help-content");
this.contentElement.tabIndex = 0;
this.contentElement.addEventListener("blur", this._onBlur.bind(this), false);
captionWindow.createChild("h1", "help-window-title").innerText = title;
closeButton.innerText = "\u2716"; // Code stands for HEAVY MULTIPLICATION X.
closeButton.addEventListener("click", this._hide.bind(this), false);
this._closeKeys = [
WebInspector.KeyboardShortcut.Keys.Enter.code,
WebInspector.KeyboardShortcut.Keys.Esc.code,
WebInspector.KeyboardShortcut.Keys.Space.code,
];
document.body.appendChild(this._element);
}
WebInspector.HelpScreen.prototype = {
show: function()
{
if (this._isShown)
return;
this._element.style.visibility = "visible";
this._isShown = true;
this._previousFocusElement = WebInspector.currentFocusElement;
WebInspector.currentFocusElement = this.contentElement;
},
_hide: function()
{
this._isShown = false;
this._element.style.visibility = "hidden";
WebInspector.currentFocusElement = this._previousFocusElement;
},
_onKeyDown: function(event)
{
if (this._isShown && this._closeKeys.indexOf(event.keyCode) >= 0) {
this._hide();
event.stopPropagation();
}
},
_onBlur: function()
{
// Pretend we're modal, grab focus back if we're still shown.
if (this._isShown)
WebInspector.currentFocusElement = this.contentElement;
},
_addStyleSheetIfNeeded: function(href)
{
if (WebInspector.HelpScreen._styleSheetAdded)
return;
WebInspector.HelpScreen._styleSheetAdded = true;
var link = document.head.createChild("link");
link.type = "text/css";
link.rel = "stylesheet";
link.href = href;
}
};