Index: third_party/polymer/components/core-resizable/core-resizable.html |
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-<!-- |
-Copyright (c) 2014 The Polymer Project Authors. All rights reserved. |
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt |
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt |
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt |
-Code distributed by Google as part of the polymer project is also |
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt |
---> |
- |
-<!-- |
- * @group Polymer Mixins |
---> |
- |
-<link rel="import" href="../polymer/polymer.html"> |
- |
-<script> |
- |
-(function(scope) { |
- |
-/** |
- `Polymer.CoreResizable` and `Polymer.CoreResizer` are a set of mixins that can be used |
- in Polymer elements to coordinate the flow of resize events between "resizers" (elements |
- that control the size or hidden state of their children) and "resizables" (elements that |
- need to be notified when they are resized or un-hidden by their parents in order to take |
- action on their new measurements). |
- |
- Elements that perform measurement should add the `Core.Resizable` mixin to their |
- Polymer prototype definition and listen for the `core-resize` event on themselves. |
- This event will be fired when they become showing after having been hidden, |
- when they are resized explicitly by a `CoreResizer`, or when the window has been resized. |
- Note, the `core-resize` event is non-bubbling. |
- |
- `CoreResizable`'s must manually call the `resizableAttachedHandler` from the element's |
- `attached` callback and `resizableDetachedHandler` from the element's `detached` |
- callback. |
- |
- @element CoreResizable |
- @status beta |
- @homepage github.io |
-*/ |
- |
- scope.CoreResizable = { |
- |
- /** |
- * User must call from `attached` callback |
- * |
- * @method resizableAttachedHandler |
- */ |
- resizableAttachedHandler: function(cb) { |
- cb = cb || this._notifyResizeSelf; |
- this.async(function() { |
- var detail = {callback: cb, hasParentResizer: false}; |
- this.fire('core-request-resize', detail); |
- if (!detail.hasParentResizer) { |
- this._boundWindowResizeHandler = cb.bind(this); |
- // log('adding window resize handler', null, this); |
- window.addEventListener('resize', this._boundWindowResizeHandler); |
- } |
- }.bind(this)); |
- }, |
- |
- /** |
- * User must call from `detached` callback |
- * |
- * @method resizableDetachedHandler |
- */ |
- resizableDetachedHandler: function() { |
- this.fire('core-request-resize-cancel', null, this, false); |
- if (this._boundWindowResizeHandler) { |
- window.removeEventListener('resize', this._boundWindowResizeHandler); |
- } |
- }, |
- |
- // Private: fire non-bubbling resize event to self; returns whether |
- // preventDefault was called, indicating that children should not |
- // be resized |
- _notifyResizeSelf: function() { |
- return this.fire('core-resize', null, this, false).defaultPrevented; |
- } |
- |
- }; |
- |
-/** |
- `Polymer.CoreResizable` and `Polymer.CoreResizer` are a set of mixins that can be used |
- in Polymer elements to coordinate the flow of resize events between "resizers" (elements |
- that control the size or hidden state of their children) and "resizables" (elements that |
- need to be notified when they are resized or un-hidden by their parents in order to take |
- action on their new measurements). |
- |
- Elements that cause their children to be resized (e.g. a splitter control) or hide/show |
- their children (e.g. overlay) should add the `Core.CoreResizer` mixin to their |
- Polymer prototype definition and then call `this.notifyResize()` any time the element |
- resizes or un-hides its children. |
- |
- `CoreResizer`'s must manually call the `resizerAttachedHandler` from the element's |
- `attached` callback and `resizerDetachedHandler` from the element's `detached` |
- callback. |
- |
- Note: `CoreResizer` extends `CoreResizable`, and can listen for the `core-resize` event |
- on itself if it needs to perform resize work on itself before notifying children. |
- In this case, returning `false` from the `core-resize` event handler (or calling |
- `preventDefault` on the event) will prevent notification of children if required. |
- |
- @element CoreResizer |
- @extends CoreResizable |
- @status beta |
- @homepage github.io |
-*/ |
- |
- scope.CoreResizer = Polymer.mixin({ |
- |
- /** |
- * User must call from `attached` callback |
- * |
- * @method resizerAttachedHandler |
- */ |
- resizerAttachedHandler: function() { |
- this.resizableAttachedHandler(this.notifyResize); |
- this._boundResizeRequested = this._boundResizeRequested || this._handleResizeRequested.bind(this); |
- var listener; |
- if (this.resizerIsPeer) { |
- listener = this.parentElement || (this.parentNode && this.parentNode.host); |
- listener._resizerPeers = listener._resizerPeers || []; |
- listener._resizerPeers.push(this); |
- } else { |
- listener = this; |
- } |
- listener.addEventListener('core-request-resize', this._boundResizeRequested); |
- this._resizerListener = listener; |
- }, |
- |
- /** |
- * User must call from `detached` callback |
- * |
- * @method resizerDetachedHandler |
- */ |
- resizerDetachedHandler: function() { |
- this.resizableDetachedHandler(); |
- this._resizerListener.removeEventListener('core-request-resize', this._boundResizeRequested); |
- }, |
- |
- /** |
- * User should call when resizing or un-hiding children |
- * |
- * @method notifyResize |
- */ |
- notifyResize: function() { |
- // Notify self |
- if (!this._notifyResizeSelf()) { |
- // Notify requestors if default was not prevented |
- var r = this.resizeRequestors; |
- if (r) { |
- for (var i=0; i<r.length; i++) { |
- var ri = r[i]; |
- if (!this.resizerShouldNotify || this.resizerShouldNotify(ri.target)) { |
- // log('notifying resize', null, ri.target, true); |
- ri.callback.apply(ri.target); |
- // logEnd(); |
- } |
- } |
- } |
- } |
- }, |
- |
- /** |
- * User should implement to introduce filtering when notifying children. |
- * Generally, children that are hidden by the CoreResizer (e.g. non-active |
- * pages) need not be notified during resize, since they will be notified |
- * again when becoming un-hidden. |
- * |
- * Return `true` if CoreResizable passed as argument should be notified of |
- * resize. |
- * |
- * @method resizeerShouldNotify |
- * @param {Element} el |
- */ |
- // resizeerShouldNotify: function(el) { } // User to implement if needed |
- |
- /** |
- * Set to `true` if the resizer is actually a peer to the elements it |
- * resizes (e.g. splitter); in this case it will listen for resize requests |
- * events from its peers on its parent. |
- * |
- * @property resizerIsPeer |
- * @type Boolean |
- * @default false |
- */ |
- |
- // Private: Handle requests for resize |
- _handleResizeRequested: function(e) { |
- var target = e.path[0]; |
- if ((target == this) || |
- (target == this._resizerListener) || |
- (this._resizerPeers && this._resizerPeers.indexOf(target) < 0)) { |
- return; |
- } |
- // log('resize requested', target, this); |
- if (!this.resizeRequestors) { |
- this.resizeRequestors = []; |
- } |
- this.resizeRequestors.push({target: target, callback: e.detail.callback}); |
- target.addEventListener('core-request-resize-cancel', this._cancelResizeRequested.bind(this)); |
- e.detail.hasParentResizer = true; |
- e.stopPropagation(); |
- }, |
- |
- // Private: Handle cancellation requests for resize |
- _cancelResizeRequested: function(e) { |
- // Exit early if we're already out of the DOM (resizeRequestors will already be null) |
- if (this.resizeRequestors) { |
- for (var i=0; i<this.resizeRequestors.length; i++) { |
- if (this.resizeRequestors[i].target == e.target) { |
- // log('resizeCanceled', e.target, this); |
- this.resizeRequestors.splice(i, 1); |
- break; |
- } |
- } |
- } |
- } |
- |
- }, Polymer.CoreResizable); |
- |
- // function prettyName(el) { |
- // return el.localName + (el.id ? '#' : '') + el.id; |
- // } |
- |
- // function log(what, from, to, group) { |
- // var args = [what]; |
- // if (from) { |
- // args.push('from ' + prettyName(from)); |
- // } |
- // if (to) { |
- // args.push('to ' + prettyName(to)); |
- // } |
- // if (group) { |
- // console.group.apply(console, args); |
- // } else { |
- // console.log.apply(console, args); |
- // } |
- // } |
- |
- // function logEnd() { |
- // console.groupEnd(); |
- // } |
- |
-})(Polymer); |
- |
-</script> |