[cc] Initial checkin of cc-frame-viewer

tools/cc-frame-viewer/src/ui/list_and_associated_view.js

+// Copyright (c) 2012 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.
+'use strict';
+
+/**
+ * @fileoverview A list of things, and a viewer for the currently selected
+ * thing.
+ */
+base.require('ui');
+base.require('ui.list_view');
+base.requireStylesheet('ui.list_and_associated_view');
+base.exportTo('ui', function() {
+
+  /**
+   * @constructor
+   */
+  var ListAndAssociatedView = ui.define('x-list-and-associated-view');
+  ListAndAssociatedView.prototype = {
+    __proto__: HTMLUnknownElement.prototype,
+
+    decorate: function() {
+      this.list_ = undefined;
+      this.listProperty_ = undefined;
+      this.view_ = undefined;
+      this.viewProperty_ = undefined;
+      this.listView_ = new ui.ListView();
+      this.listView_.addEventListener('selection-changed',
+                                      this.onSelectionChanged_.bind(this));
+      this.placeholder_ = document.createElement('div');
+      this.appendChild(this.listView_);
+      this.appendChild(this.placeholder_);
+    },
+
+    get listView() {
+      return this.listView_;
+    },
+
+    get list() {
+      return this.list_;
+    },
+
+    set list(list) {
+      this.list_ = list;
+      this.updateChildren_();
+    },
+
+    get listProperty() {
+      return this.listProperty_;
+    },
+
+    set listProperty(listProperty) {
+      this.listProperty_ = listProperty;
+      this.updateChildren_();
+    },
+
+    get view() {
+      return this.view_;
+    },
+
+    set view(view) {
+      this.view_ = view;
+      this.updateChildren_();
+    },
+
+    get viewProperty() {
+      return this.viewProperty_;
+    },
+
+    set viewProperty(viewProperty) {
+      this.viewProperty_ = viewProperty;
+      this.updateChildren_();
+    },
+
+    updateChildren_: function() {
+      var complete = this.list_ &&
+        this.listProperty_ &&
+        this.view_ &&
+        this.viewProperty_;
+      if (!complete) {
+        this.replaceChild(this.placeholder_,
+                          this.children[1]);
+        return;
+      }
+
+      for (var i = 0; i < this.list_.length; i++) {
+        var itemEl;
+        if (i >= this.listView_.children.length) {
+          itemEl = document.createElement('div');
+          this.listView_.appendChild(itemEl);
+        } else {
+          itemEl = this.listView_.children[i];
+        }
+        itemEl.item = this.list_[i];
+        var getter = this.list_[i].__lookupGetter__(this.listProperty_);
+        if (getter)
+          itemEl.textContent = getter.call(this.list_[i]);
+        else
+          itemEl.textContent = this.list_[i][this.listProperty_];
+      }
+
+      if (this.children[1] == this.placeholder_) {
+        this.replaceChild(this.view_,
+                          this.children[1]);
+      }
+      if (this.listView_.children.length &&
+          !this.listView_.selectedElement)
+        this.listView_.selectedElement = this.listView_.children[0];
+    },
+
+    onSelectionChanged_: function(e) {
+      var setter = this.view_.__lookupSetter__(this.viewProperty_);
+      if (!setter) {
+        var prop = this.viewProperty_;
+        setter = function(value) { this[prop] = value; }
+      }
+      if (this.listView_.selectedElement) {
+        setter.call(this.view_,
+                    this.listView_.selectedElement.item);
+      } else {
+        setter.call(this.view_,
+                    undefined);
+      }
+    }
+  };
+
+  return {
+    ListAndAssociatedView: ListAndAssociatedView
+  };
+});