Introduce SystemMenuButton for Ash material design

ash/common/system/tray/system_menu_button.cc

+// 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/system_menu_button.h"
+
+#include "ash/common/ash_constants.h"
+#include "ash/common/system/tray/system_tray.h"
+#include "ash/common/system/tray/tray_constants.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/paint_vector_icon.h"
+#include "ui/views/animation/flood_fill_ink_drop_ripple.h"
+#include "ui/views/animation/ink_drop_highlight.h"
+#include "ui/views/border.h"
+#include "ui/views/painter.h"
+
+namespace ash {
+
+SystemMenuButton::SystemMenuButton(views::ButtonListener* listener,
+                                   const gfx::VectorIcon& icon,
+                                   int accessible_name_id)
+    : views::ImageButton(listener) {
+  gfx::ImageSkia image = gfx::CreateVectorIcon(icon, kMenuIconColor);
+  SetImage(views::Button::STATE_NORMAL, &image);
+  const int horizontal_padding = (kMenuButtonSize - image.width()) / 2;

[James Cook, 2016/09/23 18:32:16]

Aside: It's a bit of a bummer these constants don't have names (or a namespace)
that help you figure out which file they are in. But that's a problem for
another CL.

+  const int vertical_padding = (kMenuButtonSize - image.height()) / 2;
+  SetBorder(
+      views::Border::CreateEmptyBorder(vertical_padding, horizontal_padding,
+                                       vertical_padding, horizontal_padding));
+
+  ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
+  SetTooltipText(bundle.GetLocalizedString(accessible_name_id));
+
+  // TODO(tdanderson): Update the focus rect color, border thickness, and
+  // location for material design.
+  SetFocusForPlatform();
+  SetFocusPainter(views::Painter::CreateSolidFocusPainter(
+      kFocusBorderColor, gfx::Insets(1, 1, 1, 1)));
+
+  SetInkDropMode(InkDropMode::ON_NO_GESTURE_HANDLER);
+  set_has_ink_drop_action_on_click(true);
+  set_ink_drop_base_color(kMenuIconColor);
+}
+
+SystemMenuButton::~SystemMenuButton() {}
+
+std::unique_ptr<views::InkDropRipple> SystemMenuButton::CreateInkDropRipple()
+    const {
+  return base::MakeUnique<views::FloodFillInkDropRipple>(
+      GetLocalBounds(), GetInkDropCenterBasedOnLastEvent(),
+      GetInkDropBaseColor(), ink_drop_visible_opacity());
+}
+
+std::unique_ptr<views::InkDropHighlight>
+SystemMenuButton::CreateInkDropHighlight() const {
+  gfx::Size size = GetLocalBounds().size();
+  return base::MakeUnique<views::InkDropHighlight>(
+      size, kInkDropSmallCornerRadius,
+      gfx::RectF(gfx::SizeF(size)).CenterPoint(), kMenuIconColor);
+}
+
+bool SystemMenuButton::ShouldShowInkDropForFocus() const {
+  return false;
+}
+
+}  // namespace ash