Slice MD downloads into more components

chrome/browser/resources/md_downloads/manager.js

 // Copyright 2015 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.
 
 cr.define('downloads', function() {
-  /**
-   * Class to own and manage download items.
-   * @constructor
-   */
-  function Manager() {}
+  var Manager = Polymer({
+    is: 'downloads-manager',
 
-  cr.addSingletonGetter(Manager);
+    created: function() {
+      /** @private {!downloads.ActionService} */
+      this.actionService_ = new downloads.ActionService;
+    },
 
-  Manager.prototype = {
-    /** @private {string} */
-    searchText_: '',
-
-    /**
-     * Sets the search text, updates related UIs, and tells the browser.
-     * @param {string} searchText Text we're searching for.
-     * @private
-     */
-    setSearchText_: function(searchText) {
-      this.searchText_ = searchText;
-
-      $('downloads-summary-text').textContent = this.searchText_ ?
-          loadTimeData.getStringF('searchResultsFor', this.searchText_) : '';
-
-      // Split quoted terms (e.g., 'The "lazy" dog' => ['The', 'lazy', 'dog']).
-      function trim(s) { return s.trim(); }
-      chrome.send('getDownloads', searchText.split(/"([^"]*)"/).map(trim));
+    properties: {
+      hasDownloads_: {
+        type: Boolean,
+        value: false,
+      },
     },
 
     /**
      * @return {number} A guess at how many items could be visible at once.
      * @private
      */
     guesstimateNumberOfVisibleItems_: function() {
-      var toolbarHeight = $('downloads-toolbar').offsetHeight;
-      var summaryHeight = $('downloads-summary').offsetHeight;
-      var nonItemSpace = toolbarHeight + summaryHeight;
-      return Math.floor((window.innerHeight - nonItemSpace) / 46) + 1;
+      var toolbarHeight = this.$.toolbar.offsetHeight;
+      return Math.floor((window.innerHeight - toolbarHeight) / 46) + 1;
     },
 
     /**
+     * @param {Event} e
+     * @private
+     */
+    onCanExecute_: function(e) {
+      e = /** @type {cr.ui.CanExecuteEvent} */(e);
+      switch (e.command.id) {
+        case 'undo-command':
+          e.canExecute = this.$.toolbar.canUndo();
+          break;
+        case 'clear-all-command':
+          e.canExecute = true;
+          break;
+      }
+    },
+
+    /**
+     * @param {Event} e
+     * @private
+     */
+    onCommand_: function(e) {
+      if (e.command.id == 'clear-all-command')
+        this.actionService_.clearAll();
+      else if (e.command.id == 'undo-command')
+        this.actionService_.undo();
+    },
+
+    /** @private */
+    onLoad_: function() {
+      this.$.toolbar.setActionService(this.actionService_);
+
+      cr.ui.decorate('command', cr.ui.Command);
+      document.addEventListener('canExecute', this.onCanExecute_.bind(this));
+      document.addEventListener('command', this.onCommand_.bind(this));
+
+      // Shows all downloads.
+      this.actionService_.search('');
+    },
+
+    /**
+     * @return {number} The number of downloads shown on the page.
+     * @private
+     */
+    size_: function() {
+      return this.items_.length;
+    },
+
+    /**
      * Called when all items need to be updated.
      * @param {!Array<!downloads.Data>} list A list of new download data.
      * @private
      */
     updateAll_: function(list) {
       var oldIdMap = this.idMap_ || {};
 
       /** @private {!Object<!downloads.ItemView>} */
       this.idMap_ = {};
 
       /** @private {!Array<!downloads.ItemView>} */
       this.items_ = [];
 
       if (!this.iconLoader_) {
         var guesstimate = Math.max(this.guesstimateNumberOfVisibleItems_(), 1);
         /** @private {downloads.ThrottledIconLoader} */
         this.iconLoader_ = new downloads.ThrottledIconLoader(guesstimate);
       }
 
       for (var i = 0; i < list.length; ++i) {
         var data = list[i];
         var id = data.id;
 
         // Re-use old items when possible (saves work, preserves focus).
-        var item = oldIdMap[id] || new downloads.ItemView(this.iconLoader_);
+        var item = oldIdMap[id] ||
+            new downloads.ItemView(this.iconLoader_, this.actionService_);
 
         this.idMap_[id] = item;  // Associated by ID for fast lookup.
         this.items_.push(item);  // Add to sorted list for order.
 
         // Render |item| but don't actually add to the DOM yet. |this.items_|
         // must be fully created to be able to find the right spot to insert.
         item.update(data);
 
         // Collapse redundant dates.
         var prev = list[i - 1];
@@ skipping 14 matching lines @@
         if (item.parentNode)  // Already in the DOM; skip.
           continue;
 
         var before = null;
         // Find the next rendered item after this one, and insert before it.
         for (var j = i + 1; !before && j < this.items_.length; ++j) {
           if (this.items_[j].parentNode)
             before = this.items_[j];
         }
         // If |before| is null, |item| will just get added at the end.
-        this.node_.insertBefore(item, before);
+        this.$['downloads-list'].insertBefore(item, before);
       }
 
-      var noDownloadsOrResults = $('no-downloads-or-results');
-      noDownloadsOrResults.textContent = loadTimeData.getString(
-          this.searchText_ ? 'noSearchResults' : 'noDownloads');
-
-      var hasDownloads = this.size_() > 0;
-      this.node_.hidden = !hasDownloads;
-      noDownloadsOrResults.hidden = hasDownloads;
+      this.hasDownloads_ = this.size_() > 0;
 
       if (loadTimeData.getBoolean('allowDeletingHistory'))
-        $('clear-all').hidden = !hasDownloads || this.searchText_.length > 0;
+        this.$.toolbar.canClearAll = this.hasDownloads_;
     },
 
     /**
      * @param {!downloads.Data} data
      * @private
      */
     updateItem_: function(data) {
       this.idMap_[data.id].update(data);
     },
+  });
 
-    /**
-     * @return {number} The number of downloads shown on the page.
-     * @private
-     */
-    size_: function() {
-      return this.items_.length;
-    },
-
-    /** @private */
-    clearAll_: function() {
-      if (loadTimeData.getBoolean('allowDeletingHistory')) {
-        chrome.send('clearAll');
-        this.setSearchText_('');
-      }
-    },
-
-    /** @private */
-    onLoad_: function() {
-      this.node_ = $('downloads-display');
-
-      $('clear-all').onclick = function() {
-        this.clearAll_();
-      }.bind(this);
-
-      $('open-downloads-folder').onclick = function() {
-        chrome.send('openDownloadsFolder');
-      };
-
-      $('search-button').onclick = function() {
-        if (!$('search-term').hidden)
-          return;
-        $('clear-search').hidden = false;
-        $('search-term').hidden = false;
-      };
-
-      $('clear-search').onclick = function() {
-        $('clear-search').hidden = true;
-        $('search-term').hidden = true;
-        $('search-term').value = '';
-        this.setSearchText_('');
-      }.bind(this);
-
-      // TODO(dbeam): this previously used onsearch, which batches keystrokes
-      // together. This should probably be re-instated eventually.
-      $('search-term').oninput = function(e) {
-        this.setSearchText_($('search-term').value);
-      }.bind(this);
-
-      cr.ui.decorate('command', cr.ui.Command);
-      document.addEventListener('canExecute', this.onCanExecute_.bind(this));
-      document.addEventListener('command', this.onCommand_.bind(this));
-
-      this.setSearchText_('');
-    },
-
-    /**
-     * @param {Event} e
-     * @private
-     */
-    onCanExecute_: function(e) {
-      e = /** @type {cr.ui.CanExecuteEvent} */(e);
-      switch (e.command.id) {
-        case 'undo-command':
-          e.canExecute = !$('search-term').contains(document.activeElement);
-          break;
-        case 'clear-all-command':
-          e.canExecute = true;
-          break;
-      }
-    },
-
-    /**
-     * @param {Event} e
-     * @private
-     */
-    onCommand_: function(e) {
-      if (e.command.id == 'undo-command')
-        chrome.send('undo');
-      else if (e.command.id == 'clear-all-command')
-        this.clearAll_();
-    },
+  Manager.size = function() {
+    return document.querySelector('downloads-manager').size_();
   };
 
   Manager.updateAll = function(list) {
-    Manager.getInstance().updateAll_(list);
+    document.querySelector('downloads-manager').updateAll_(list);
   };
 
   Manager.updateItem = function(item) {
-    Manager.getInstance().updateItem_(item);
-  };
-
-  Manager.setSearchText = function(searchText) {
-    Manager.getInstance().setSearchText_(searchText);
+    document.querySelector('downloads-manager').updateItem_(item);
   };
 
   Manager.onLoad = function() {
-    Manager.getInstance().onLoad_();
-  };
-
-  Manager.size = function() {
-    return Manager.getInstance().size_();
+    document.querySelector('downloads-manager').onLoad_();
   };
 
   return {Manager: Manager};
 });
 
 window.addEventListener('load', downloads.Manager.onLoad);