Implement app list folder management page UI.

ui/app_list/views/app_list_folder_view.cc

Index: ui/app_list/views/app_list_folder_view.cc
diff --git a/ui/app_list/views/app_list_folder_view.cc b/ui/app_list/views/app_list_folder_view.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a35fab31a76c8d4c69ca95d99b89303af2f570d2
--- /dev/null
+++ b/ui/app_list/views/app_list_folder_view.cc
@@ -0,0 +1,93 @@
+// Copyright 2013 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.
+
+#include "ui/app_list/views/app_list_folder_view.h"
+
+#include "ui/app_list/app_list_constants.h"
+#include "ui/app_list/app_list_folder_item.h"
+#include "ui/app_list/app_list_model.h"
+#include "ui/app_list/pagination_model.h"
+#include "ui/app_list/views/app_list_main_view.h"
+#include "ui/app_list/views/apps_grid_view.h"
+#include "ui/app_list/views/contents_view.h"
+#include "ui/app_list/views/folder_header_view.h"
+#include "ui/views/view_model.h"
+#include "ui/views/view_model_utils.h"
+
+namespace app_list {
+
+namespace {
+
+// Indexes of interesting views in ViewModel of AppListFolderView.
+const int kIndexFolderHeader = 0;
+const int kIndexChildItems = 1;
+
+}  // namespace
+
+AppListFolderView::AppListFolderView(ContentsView* contents_view,
+                                     AppListModel* model,
+                                     AppListMainView* app_list_main_view,
+                                     PaginationModel* pagination_model,
+                                     content::WebContents* start_page_contents)
+    : contents_view_(contents_view),
+      folder_header_view_(new FolderHeaderView(this)),
+      view_model_(new views::ViewModel),
+      folder_item_(NULL) {
+  AddChildView(folder_header_view_);
+  view_model_->Add(folder_header_view_, kIndexFolderHeader);
+
+  items_grid_view_ = new AppsGridView(
+        app_list_main_view, pagination_model, start_page_contents);

[xiyuan, 2013/10/17 23:50:30]

AppsGridView needs a AppsGridViewDelegate to pass back which item needs to be
activated. Here, we should make |this| such a delegate instead of using the root
one.

Similar to pagination_model and start_page_contents, create dummy ones here
instead of using the outer ones.

[jennyz, 2013/10/18 22:09:02]

Per our discussion, since the folder item activation is no different than apps
page item activation, we can still use AppsGridViewDelegate from the root. Get
rid of the pagination_model and start_page_contents from the root. 

+  items_grid_view_->SetLayout(kPreferredIconDimension,
+                              kPreferredCols,
+                              kPreferredRows);
+  items_grid_view_->SetModel(model);
+  AddChildView(items_grid_view_);
+  view_model_->Add(items_grid_view_, kIndexChildItems);
+}
+
+AppListFolderView::~AppListFolderView() {
+}
+
+void AppListFolderView::SetAppListFolderItem(AppListFolderItem* folder) {

[xiyuan, 2013/10/17 23:50:30]

Why not pass |folder| in constructor?

[jennyz, 2013/10/18 22:09:02]

Since AppsListFolderView is constructed before it knows which folder it will
belong to, so we can't pass it in constructor, instead, need to set it when the
folder item is activated.

+  folder_item_ = folder;
+  items_grid_view_->SetApps(folder_item_->apps());
+  folder_header_view_->SetFolderItem(folder_item_);
+}
+
+void AppListFolderView::CalculateIdealBounds() {
+  gfx::Rect rect(GetContentsBounds());
+  if (rect.IsEmpty())
+    return;
+
+  gfx::Rect header_frame(rect);
+  gfx::Size size = folder_header_view_->GetPreferredSize();
+  header_frame.set_height(size.height());
+  view_model_->set_ideal_bounds(kIndexFolderHeader, header_frame);
+
+  gfx::Rect grid_frame(rect);
+  grid_frame.set_y(header_frame.height());
+  view_model_->set_ideal_bounds(kIndexChildItems, grid_frame);
+}
+
+gfx::Size AppListFolderView::GetPreferredSize() {
+  const gfx::Size header_size = folder_header_view_->GetPreferredSize();
+  const gfx::Size grid_size = items_grid_view_->GetPreferredSize();
+  int width = std::max(header_size.width(), grid_size.width());
+  int height = header_size.height() + grid_size.height();
+  return gfx::Size(width, height);
+}
+
+void AppListFolderView::Layout() {
+  CalculateIdealBounds();
+  views::ViewModelUtils::SetViewBoundsToIdealBounds(*view_model_);
+}
+
+void AppListFolderView::ButtonPressed(views::Button* sender,

[xiyuan, 2013/10/17 23:50:30]

Move this into FolderHeaderView and use a delegate to call back if needed. Make
this a directly listener for a button inside a child view is easy to break.

[jennyz, 2013/10/18 22:09:02]

Moved this into FolderHeaderView and make AppListFolderView a delegate to
FolderHeaderView to server the call back for back button pressed event.

+                                      const ui::Event& event) {
+  contents_view_->ShowApps();
+}
+
+}  // namespace app_list
+