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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Implements an element that is hidden by default, but
* when shown, dims and (attempts to) disable the main document.
*
* You can turn any div into an overlay. Note that while an
* overlay element is shown, its parent is changed. Hiding the overlay
* restores its original parentage.
*
*/
cr.define('tracing', function() {
/**
* Manages a full-window div that darkens the window, disables
* input, and hosts the currently-visible overlays. You shouldn't
* have to instantiate this directly --- it gets set automatically.
* @param {Object=} opt_propertyBag Optional properties.
* @constructor
* @extends {HTMLDivElement}
*/
var OverlayRoot = cr.ui.define('div');
OverlayRoot.prototype = {
__proto__: HTMLDivElement.prototype,
decorate: function() {
this.classList.add('overlay-root');
this.visible = false;
this.contentHost = this.ownerDocument.createElement('div');
this.contentHost.classList.add('content-host');
this.tabCatcher = this.ownerDocument.createElement('span');
this.tabCatcher.tabIndex = 0;
this.appendChild(this.contentHost);
this.onKeydownBoundToThis_ = this.onKeydown_.bind(this);
this.onFocusInBoundToThis_ = this.onFocusIn_.bind(this);
this.addEventListener('mousedown', this.onMousedown_.bind(this));
},
/**
* Adds an overlay, attaching it to the contentHost so that it is visible.
*/
showOverlay: function(overlay) {
// Reparent this to the overlay content host.
overlay.oldParent_ = overlay.parentNode;
this.contentHost.appendChild(overlay);
this.contentHost.appendChild(this.tabCatcher);
// Show the overlay root.
this.ownerDocument.body.classList.add('disabled-by-overlay');
this.visible = true;
// Bring overlay into focus.
overlay.tabIndex = 0;
overlay.focus();
// Listen to key and focus events to prevent focus from
// leaving the overlay.
this.ownerDocument.addEventListener('focusin',
this.onFocusInBoundToThis_, true);
overlay.addEventListener('keydown', this.onKeydownBoundToThis_);
},
/**
* Clicking outside of the overlay will de-focus the overlay. The
* next tab will look at the entire document to determine the focus.
* For certain documents, this can cause focus to "leak" outside of
* the overlay.
*/
onMousedown_: function(e) {
if (e.target == this) {
e.preventDefault();
}
},
/**
* Prevents forward-tabbing out of the overlay
*/
onFocusIn_: function(e) {
if (e.target == this.tabCatcher) {
window.setTimeout(this.focusOverlay_.bind(this), 0);
}
},
focusOverlay_: function() {
this.contentHost.firstChild.focus();
},
/**
* Prevent the user from shift-tabbing backwards out of the overlay.
*/
onKeydown_: function(e) {
if (e.keyCode == 9 &&
e.shiftKey &&
e.target == this.contentHost.firstChild) {
e.preventDefault();
}
},
/**
* Hides an overlay, attaching it to its original parent if needed.
*/
hideOverlay: function(overlay) {
// hide the overlay root
this.visible = false;
this.ownerDocument.body.classList.remove('disabled-by-overlay');
this.lastFocusOut_ = undefined;
// put the overlay back on its previous parent
overlay.parentNode.removeChild(this.tabCatcher);
if (overlay.oldParent_) {
overlay.oldParent_.appendChild(overlay);
delete overlay.oldParent_;
} else {
this.contentHost.removeChild(overlay);
}
// remove listeners
overlay.removeEventListener('keydown', this.onKeydownBoundToThis_);
this.ownerDocument.removeEventListener('focusin',
this.onFocusInBoundToThis_);
}
};
cr.defineProperty(OverlayRoot, 'visible', cr.PropertyKind.BOOL_ATTR);
/**
* Creates a new overlay element. It will not be visible until shown.
* @param {Object=} opt_propertyBag Optional properties.
* @constructor
* @extends {HTMLDivElement}
*/
var Overlay = cr.ui.define('div');
Overlay.prototype = {
__proto__: HTMLDivElement.prototype,
/**
* Initializes the overlay element.
*/
decorate: function() {
// create the overlay root on this document if its not present
if (!this.ownerDocument.querySelector('.overlay-root')) {
var overlayRoot = this.ownerDocument.createElement('div');
cr.ui.decorate(overlayRoot, OverlayRoot);
this.ownerDocument.body.appendChild(overlayRoot);
}
this.classList.add('overlay');
this.visible = false;
},
onVisibleChanged_: function() {
var overlayRoot = this.ownerDocument.querySelector('.overlay-root');
if (this.visible) {
overlayRoot.showOverlay(this);
} else {
overlayRoot.hideOverlay(this);
}
}
};
/**
* Shows and hides the overlay. Note that while visible == true, the overlay
* element will be tempoarily reparented to another place in the DOM.
*/
cr.defineProperty(Overlay, 'visible', cr.PropertyKind.BOOL_ATTR,
Overlay.prototype.onVisibleChanged_);
return {
Overlay: Overlay
};
});
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