Added common layout framework for system menu rows.

ash/common/system/tray/three_view_layout.cc

Index: ash/common/system/tray/three_view_layout.cc
diff --git a/ash/common/system/tray/three_view_layout.cc b/ash/common/system/tray/three_view_layout.cc
new file mode 100644
index 0000000000000000000000000000000000000000..db1ef699449b71cd57d66bf2abe4d828208ea249
--- /dev/null
+++ b/ash/common/system/tray/three_view_layout.cc
@@ -0,0 +1,184 @@
+// Copyright 2016 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 "ash/common/system/tray/three_view_layout.h"
+
+#include "ash/common/system/tray/size_range_layout.h"
+#include "base/logging.h"
+#include "ui/views/border.h"
+#include "ui/views/layout/box_layout.h"
+#include "ui/views/layout/fill_layout.h"
+
+namespace ash {
+namespace {
+
+// Converts ThreeViewLayout::Orientation values to
+// views::BoxLayout::Orientation values.
+views::BoxLayout::Orientation GetOrientation(
+    ThreeViewLayout::Orientation orientation) {
+  switch (orientation) {
+    case ThreeViewLayout::HORIZONTAL:
+      return views::BoxLayout::kHorizontal;
+    case ThreeViewLayout::VERTICAL:
+      return views::BoxLayout::kVertical;
+  }
+}
+
+}  // namespace
+
+ThreeViewLayout::ThreeViewLayout(int padding_between_items)
+    : ThreeViewLayout(HORIZONTAL, padding_between_items) {}
+
+ThreeViewLayout::ThreeViewLayout(Orientation orientation,
+                                 int padding_between_items)
+    : box_layout_(new views::BoxLayout(GetOrientation(orientation),
+                                       0,
+                                       0,
+                                       padding_between_items)),
+      start_container_(new views::View),
+      start_container_layout_manager_(new SizeRangeLayout),
+      center_container_(new views::View),
+      center_container_layout_manager_(new SizeRangeLayout),
+      end_container_(new views::View),
+      end_container_layout_manager_(new SizeRangeLayout) {
+  start_container_->SetLayoutManager(GetLayoutManager(START));
+  center_container_->SetLayoutManager(GetLayoutManager(CENTER));
+  end_container_->SetLayoutManager(GetLayoutManager(END));
+  GetLayoutManager(START)->SetLayoutManager(
+      CreateDefaultLayoutManager(orientation));
+  GetLayoutManager(CENTER)->SetLayoutManager(
+      CreateDefaultLayoutManager(orientation));
+  GetLayoutManager(END)->SetLayoutManager(
+      CreateDefaultLayoutManager(orientation));
+}
+
+ThreeViewLayout::~ThreeViewLayout() {}
+
+void ThreeViewLayout::SetMinCrossAxisSize(int min_size) {
+  box_layout_->set_minimum_cross_axis_size(min_size);
+}
+
+void ThreeViewLayout::SetMinSize(Container container, const gfx::Size& size) {
+  GetLayoutManager(container)->set_min_size(size);
+}
+
+void ThreeViewLayout::SetMaxSize(Container container, const gfx::Size& size) {
+  GetLayoutManager(container)->set_max_size(size);
+}
+
+void ThreeViewLayout::AddView(Container container, views::View* view) {
+  views::View* container_view = GetContainer(container);
+  container_view->AddChildView(view);
+}
+
+void ThreeViewLayout::SetView(Container container, views::View* view) {
+  views::View* container_view = GetContainer(container);
+  container_view->RemoveAllChildViews(true);
+  container_view->AddChildView(view);
+}
+
+void ThreeViewLayout::SetInsets(const gfx::Insets& insets) {
+  box_layout_->set_inside_border_insets(insets);
+}
+
+void ThreeViewLayout::SetInsets(Container container,
+                                const gfx::Insets& insets) {
+  GetContainer(container)->SetBorder(views::Border::CreateEmptyBorder(insets));
+}
+
+void ThreeViewLayout::SetContainerVisible(Container container, bool visible) {
+  GetContainer(container)->SetVisible(visible);
+}
+
+void ThreeViewLayout::SetFlexForView(Container container, int flex) {
+  box_layout_->SetFlexForView(GetContainer(container), flex);
+}
+
+void ThreeViewLayout::SetLayoutManager(
+    Container container,
+    std::unique_ptr<LayoutManager> layout_manager) {
+  if (GetLayoutManager(container))
+    GetLayoutManager(container)->Uninstalled(GetContainer(container));
+  GetLayoutManager(container)->SetLayoutManager(std::move(layout_manager));
+  if (GetLayoutManager(container))
+    GetLayoutManager(container)->Installed(GetContainer(container));
+}
+
+void ThreeViewLayout::Installed(views::View* host) {
+  DCHECK(!host_);
+  host_ = host;
+  if (host_) {
+    host_->AddChildView(GetContainer(START));
+    host_->AddChildView(GetContainer(CENTER));
+    host_->AddChildView(GetContainer(END));
+  }
+  box_layout_->Installed(host_);
+}
+
+void ThreeViewLayout::Uninstalled(views::View* host) {
+  DCHECK_EQ(host_, host);
+  if (host_) {
+    host_->RemoveChildView(GetContainer(START));
+    host_->RemoveChildView(GetContainer(CENTER));
+    host_->RemoveChildView(GetContainer(END));
+  }
+  box_layout_->Uninstalled(host);
+  host_ = nullptr;
+}
+
+void ThreeViewLayout::Layout(views::View* host) {
+  box_layout_->Layout(host);
+}
+
+gfx::Size ThreeViewLayout::GetPreferredSize(const views::View* host) const {
+  return box_layout_->GetPreferredSize(host);
+}
+
+int ThreeViewLayout::GetPreferredHeightForWidth(const views::View* host,
+                                                int width) const {
+  return box_layout_->GetPreferredHeightForWidth(host, width);
+}
+
+void ThreeViewLayout::ViewAdded(views::View* host, views::View* view) {
+  box_layout_->ViewAdded(host, view);
+}
+
+void ThreeViewLayout::ViewRemoved(views::View* host, views::View* view) {
+  box_layout_->ViewRemoved(host, view);
+}
+
+std::unique_ptr<views::LayoutManager>
+ThreeViewLayout::CreateDefaultLayoutManager(Orientation orientation) const {
+  views::BoxLayout* box_layout =
+      new views::BoxLayout(GetOrientation(orientation), 0, 0, 0);
+  box_layout->set_main_axis_alignment(
+      views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
+  box_layout->set_cross_axis_alignment(
+      views::BoxLayout::CROSS_AXIS_ALIGNMENT_CENTER);
+  return std::unique_ptr<views::LayoutManager>(box_layout);
+}
+
+views::View* ThreeViewLayout::GetContainer(Container container) const {
+  switch (container) {
+    case START:
+      return start_container_;
+    case CENTER:
+      return center_container_;
+    case END:
+      return end_container_;
+  }
+}
+
+SizeRangeLayout* ThreeViewLayout::GetLayoutManager(Container container) const {
+  switch (container) {
+    case START:
+      return start_container_layout_manager_;
+    case CENTER:
+      return center_container_layout_manager_;
+    case END:
+      return end_container_layout_manager_;
+  }
+}
+
+}  // namespace ash