Adding a native theme painter, to allow Views to use NativeTheme to draw

their background.  Added example code to show it in use.  I still have not
hooked this into any existing View-based controls.

This CL depends on changes currently being made to native theme, see
http://codereview.chromium.org/6728029/ for details.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/6771056

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80952 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 501 insertions, 0 deletions

diff --git a/views/examples/examples_main.cc b/views/examples/examples_main.cc
index 0ab98f6..1326672 100644
--- a/views/examples/examples_main.cc
+++ b/views/examples/examples_main.cc
@@ -18,6 +18,7 @@
 #include "views/examples/combobox_example.h"
 #include "views/examples/menu_example.h"
 #include "views/examples/message_box_example.h"
+#include "views/examples/native_theme_button_example.h"
 #include "views/examples/radio_button_example.h"
 #include "views/examples/scroll_view_example.h"
 #include "views/examples/single_split_view_example.h"
@@ -101,6 +102,10 @@ void ExamplesMain::Run() {
   views::Window* window =
       views::Window::CreateChromeWindow(NULL, gfx::Rect(0, 0, 850, 300), this);
 
+  examples::NativeThemeButtonExample native_theme_button_example(this);
+  tabbed_pane->AddTab(native_theme_button_example.GetExampleTitle(),
+                      native_theme_button_example.GetExampleView());
+
   examples::TextfieldExample textfield_example(this);
   tabbed_pane->AddTab(textfield_example.GetExampleTitle(),
                       textfield_example.GetExampleView());
diff --git a/views/examples/native_theme_button_example.cc b/views/examples/native_theme_button_example.cc
new file mode 100644
index 0000000..b6bee09
--- /dev/null
+++ b/views/examples/native_theme_button_example.cc
@@ -0,0 +1,268 @@
+// Copyright (c) 2011 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 "views/examples/native_theme_button_example.h"
+
+#include "base/logging.h"
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "ui/base/animation/throb_animation.h"
+#include "ui/base/models/combobox_model.h"
+#include "ui/gfx/canvas.h"
+#include "views/controls/label.h"
+#include "views/native_theme_painter.h"
+#include "views/layout/grid_layout.h"
+
+namespace {
+
+class ExampleComboboxModel : public ui::ComboboxModel {
+ public:
+  ExampleComboboxModel(const wchar_t** strings, int count)
+      : strings_(strings), count_(count) {
+  }
+
+  void set_data(const wchar_t** strings, int count) {
+    strings_ = strings;
+    count_ = count;
+  }
+
+  // Overridden from ui::ComboboxModel:
+  virtual int GetItemCount() OVERRIDE {
+    return count_;
+  }
+  virtual string16 GetItemAt(int index) OVERRIDE {
+    return WideToUTF16Hack(strings_[index]);
+  }
+
+ private:
+  const wchar_t** strings_;
+  int count_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExampleComboboxModel);
+};
+
+const wchar_t* kParts[] = {
+    L"PushButton",
+    L"RadioButton",
+    L"Checkbox",
+};
+
+const wchar_t* kStates[] = {
+    L"Disabled",
+    L"Normal",
+    L"Hot",
+    L"Pressed",
+    L"<Dynamic>",
+};
+
+}  // anonymous namespace
+
+namespace examples {
+
+ExampleNativeThemeButton::ExampleNativeThemeButton(
+    views::ButtonListener* listener,
+    views::Combobox* cb_part,
+    views::Combobox* cb_state)
+    : CustomButton(listener),
+      cb_part_(cb_part),
+      cb_state_(cb_state),
+      count_(0),
+      is_checked_(false),
+      is_indeterminate_(false) {
+  cb_part_->set_listener(this);
+  cb_state_->set_listener(this);
+
+  painter_.reset(new views::NativeThemePainter(this));
+  set_background(views::Background::CreateBackgroundPainter(
+      false, painter_.get()));
+}
+
+std::wstring ExampleNativeThemeButton::MessWithState() {
+  const wchar_t* message;
+  switch(GetThemePart()) {
+  case gfx::NativeTheme::kPushButton:
+    message = L"Pressed! count:%d";
+    break;
+  case gfx::NativeTheme::kRadio:
+    is_checked_ = !is_checked_;
+    message = is_checked_ ? L"Checked! count:%d" : L"Unchecked! count:%d";
+    break;
+  case gfx::NativeTheme::kCheckbox:
+    if (is_indeterminate_) {
+      is_checked_ = false;
+      is_indeterminate_ = false;
+    } else if (!is_checked_) {
+      is_checked_ = true;
+    } else {
+      is_checked_ = false;
+      is_indeterminate_ = true;
+    }
+
+    message = is_checked_ ? L"Checked! count:%d" :
+      is_indeterminate_ ? L"Indeterminate! count:%d" : L"Unchecked! count:%d";
+    break;
+  default:
+    DCHECK(false);
+  }
+
+  return base::StringPrintf(message, ++count_);
+}
+
+void ExampleNativeThemeButton::ItemChanged(views::Combobox* combo_box,
+                                           int prev_index,
+                                           int new_index) {
+  SchedulePaint();
+}
+
+gfx::NativeTheme::Part ExampleNativeThemeButton::GetThemePart() const {
+  int selected = cb_part_->selected_item();
+  switch(selected) {
+    case 0:
+      return gfx::NativeTheme::kPushButton;
+    case 1:
+      return gfx::NativeTheme::kRadio;
+    case 2:
+      return gfx::NativeTheme::kCheckbox;
+    default:
+      DCHECK(false);
+  }
+  return gfx::NativeTheme::kPushButton;
+}
+
+gfx::NativeTheme::State ExampleNativeThemeButton::GetThemeState(
+    gfx::NativeTheme::ExtraParams* params) const {
+  GetExtraParams(params);
+
+  int selected = cb_state_->selected_item();
+  if (selected > 3) {
+    switch(state()) {
+      case BS_DISABLED:
+        return gfx::NativeTheme::kDisabled;
+      case BS_NORMAL:
+        return gfx::NativeTheme::kNormal;
+      case BS_HOT:
+        return gfx::NativeTheme::kHovered;
+      case BS_PUSHED:
+        return gfx::NativeTheme::kPressed;
+      default:
+        DCHECK(false);
+    }
+  }
+
+  switch(selected) {
+    case 0:
+      return gfx::NativeTheme::kDisabled;
+    case 1:
+      return gfx::NativeTheme::kNormal;
+    case 2:
+      return gfx::NativeTheme::kHovered;
+    case 3:
+      return gfx::NativeTheme::kPressed;
+    default:
+      DCHECK(false);
+  }
+  return gfx::NativeTheme::kNormal;
+}
+
+void ExampleNativeThemeButton::GetExtraParams(
+    gfx::NativeTheme::ExtraParams* params) const {
+
+  params->button.checked = is_checked_;
+  params->button.indeterminate = is_indeterminate_;
+  params->button.is_default = false;
+  params->button.has_border = false;
+  params->button.classic_state = 0;
+  params->button.background_color = SkColorSetARGB(0, 0, 0, 0);
+}
+
+ui::Animation* ExampleNativeThemeButton::GetThemeAnimation() const {
+  int selected = cb_state_->selected_item();
+  return selected <= 3 ? NULL : hover_animation_.get();
+}
+
+gfx::NativeTheme::State ExampleNativeThemeButton::GetBackgroundThemeState(
+    gfx::NativeTheme::ExtraParams* params) const {
+  GetExtraParams(params);
+  return gfx::NativeTheme::kNormal;
+}
+
+gfx::NativeTheme::State ExampleNativeThemeButton::GetForegroundThemeState(
+    gfx::NativeTheme::ExtraParams* params) const {
+  GetExtraParams(params);
+  return gfx::NativeTheme::kHovered;
+}
+
+gfx::Size ExampleNativeThemeButton::GetPreferredSize() {
+  return painter_.get() == NULL ? gfx::Size() : painter_->GetPreferredSize();
+}
+
+void ExampleNativeThemeButton::OnPaintBackground(gfx::Canvas* canvas) {
+  // Fill the background with a known colour so that we know where the bounds
+  // of the View are.
+  canvas->FillRectInt(SkColorSetRGB(255, 128, 128), 0, 0, width(), height());
+  CustomButton::OnPaintBackground(canvas);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+NativeThemeButtonExample::NativeThemeButtonExample(ExamplesMain* main)
+    : ExampleBase(main) {
+}
+
+NativeThemeButtonExample::~NativeThemeButtonExample() {
+}
+
+std::wstring NativeThemeButtonExample::GetExampleTitle() {
+  return L"Native Theme Button";
+}
+
+void NativeThemeButtonExample::CreateExampleView(views::View* container) {
+  views::GridLayout* layout = new views::GridLayout(container);
+  container->SetLayoutManager(layout);
+
+  layout->AddPaddingRow(0, 8);
+
+  views::ColumnSet* column_set = layout->AddColumnSet(0);
+  column_set->AddPaddingColumn(0, 8);
+  column_set->AddColumn(views::GridLayout::LEADING, views::GridLayout::FILL,
+                        0.1f, views::GridLayout::USE_PREF, 0, 0);
+  column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL,
+                        0.9f, views::GridLayout::USE_PREF, 0, 0);
+  column_set->AddPaddingColumn(0, 8);
+
+  layout->StartRow(0, 0);
+  layout->AddView(new views::Label(L"Part:"));
+  views::Combobox* cb_part = new views::Combobox(
+      new ExampleComboboxModel(kParts, arraysize(kParts)));
+  cb_part->SetSelectedItem(0);
+  layout->AddView(cb_part);
+
+  layout->StartRow(0, 0);
+  layout->AddView(new views::Label(L"State:"));
+  views::Combobox* cb_state = new views::Combobox(
+      new ExampleComboboxModel(kStates, arraysize(kStates)));
+  cb_state->SetSelectedItem(0);
+  layout->AddView(cb_state);
+
+  layout->AddPaddingRow(0, 32);
+
+  button_ = new ExampleNativeThemeButton(this, cb_part, cb_state);
+
+  column_set = layout->AddColumnSet(1);
+  column_set->AddPaddingColumn(0, 16);
+  column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL,
+                        1, views::GridLayout::USE_PREF, 0, 0);
+  column_set->AddPaddingColumn(0, 16);
+  layout->StartRow(1, 1);
+  layout->AddView(button_);
+
+  layout->AddPaddingRow(0, 8);
+}
+
+void NativeThemeButtonExample::ButtonPressed(views::Button* sender,
+                                             const views::Event& event) {
+  PrintStatus(button_->MessWithState().c_str());
+}
+
+}  // namespace examples
diff --git a/views/examples/native_theme_button_example.h b/views/examples/native_theme_button_example.h
new file mode 100644
index 0000000..702eab8
--- /dev/null
+++ b/views/examples/native_theme_button_example.h
@@ -0,0 +1,91 @@
+// Copyright (c) 2011 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.
+
+#ifndef VIEWS_EXAMPLES_NATIVE_THEME_BUTTON_EXAMPLE_H_
+#define VIEWS_EXAMPLES_NATIVE_THEME_BUTTON_EXAMPLE_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "ui/gfx/native_theme.h"
+#include "views/controls/button/custom_button.h"
+#include "views/controls/combobox/combobox.h"
+#include "views/examples/example_base.h"
+#include "views/native_theme_painter.h"
+
+namespace views {
+class Combobox;
+class NativeThemePainter;
+}
+
+namespace examples {
+
+// A subclass of button to test native theme rendering.
+class ExampleNativeThemeButton : public views::CustomButton,
+                                 public views::NativeThemePainter::Delegate,
+                                 public views::Combobox::Listener {
+ public:
+  ExampleNativeThemeButton(views::ButtonListener* listener,
+                           views::Combobox* cb_part,
+                           views::Combobox* cb_state);
+
+  std::wstring MessWithState();
+
+ private:
+  // Overridden from View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void OnPaintBackground(gfx::Canvas* canvas)  OVERRIDE;
+
+  // Overridden from views::Combobox::Listener:
+  virtual void ItemChanged(views::Combobox* combo_box,
+                           int prev_index,
+                           int new_index) OVERRIDE;
+
+  // Overridden from views::NativeThemePainter::Delegate:
+  virtual gfx::NativeTheme::Part GetThemePart() const OVERRIDE;
+  virtual gfx::NativeTheme::State GetThemeState(
+      gfx::NativeTheme::ExtraParams* params) const OVERRIDE;
+  virtual ui::Animation* GetThemeAnimation() const OVERRIDE;
+  virtual gfx::NativeTheme::State GetBackgroundThemeState(
+      gfx::NativeTheme::ExtraParams* params) const OVERRIDE;
+  virtual gfx::NativeTheme::State GetForegroundThemeState(
+      gfx::NativeTheme::ExtraParams* params) const OVERRIDE;
+
+  void GetExtraParams(gfx::NativeTheme::ExtraParams* params) const;
+
+  scoped_ptr<views::NativeThemePainter> painter_;
+  views::Combobox* cb_part_;
+  views::Combobox* cb_state_;
+  int count_;
+  bool is_checked_;
+  bool is_indeterminate_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExampleNativeThemeButton);
+};
+
+// NativeThemeButtonExample shows how a View can use the NativeThemePainter
+// to paints its background and get a native look.
+class NativeThemeButtonExample : public ExampleBase,
+                                 public views::ButtonListener {
+ public:
+  explicit NativeThemeButtonExample(ExamplesMain* main);
+  virtual ~NativeThemeButtonExample();
+
+  // Overridden from ExampleBase:
+  virtual std::wstring GetExampleTitle() OVERRIDE;
+  virtual void CreateExampleView(views::View* container) OVERRIDE;
+
+ private:
+  // Overridden from views::ButtonListener:
+  virtual void ButtonPressed(views::Button* sender,
+                             const views::Event& event) OVERRIDE;
+
+  // The only control in this test.
+  ExampleNativeThemeButton* button_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeThemeButtonExample);
+};
+
+}  // namespace examples
+
+#endif  // VIEWS_EXAMPLES_NATIVE_THEME_BUTTON_EXAMPLE_H_
diff --git a/views/native_theme_painter.cc b/views/native_theme_painter.cc
new file mode 100644
index 0000000..1d4ab21
--- /dev/null
+++ b/views/native_theme_painter.cc
@@ -0,0 +1,54 @@
+// Copyright (c) 2011 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 "views/native_theme_painter.h"
+
+#include "base/logging.h"
+#include "ui/base/animation/animation.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/canvas_skia.h"
+#include "ui/gfx/rect.h"
+
+namespace views {
+
+NativeThemePainter::NativeThemePainter(Delegate* delegate)
+    : delegate_(delegate) {
+  DCHECK(delegate_);
+}
+
+gfx::Size NativeThemePainter::GetPreferredSize() {
+  const gfx::NativeTheme* theme = gfx::NativeTheme::instance();
+  return theme->GetPartSize(delegate_->GetThemePart());
+}
+
+void NativeThemePainter::Paint(int w, int h, gfx::Canvas* canvas) {
+  const gfx::NativeTheme* native_theme = gfx::NativeTheme::instance();
+  gfx::NativeTheme::Part part = delegate_->GetThemePart();
+  gfx::CanvasSkia* skia_canvas = canvas->AsCanvasSkia();
+  gfx::Rect rect(0, 0, w, h);
+
+  if (delegate_->GetThemeAnimation() != NULL &&
+      delegate_->GetThemeAnimation()->is_animating()) {
+
+    // Paint background state.
+    gfx::NativeTheme::ExtraParams prev_extra;
+    gfx::NativeTheme::State prev_state =
+        delegate_->GetBackgroundThemeState(&prev_extra);
+    native_theme->Paint(skia_canvas, part, prev_state, rect, prev_extra);
+
+    // Composite foreground state above it.
+    gfx::NativeTheme::ExtraParams extra;
+    gfx::NativeTheme::State state = delegate_->GetForegroundThemeState(&extra);
+    int alpha = delegate_->GetThemeAnimation()->CurrentValueBetween(0, 255);
+    skia_canvas->SaveLayerAlpha(static_cast<uint8>(alpha));
+    native_theme->Paint(skia_canvas, part, state, rect, extra);
+    skia_canvas->Restore();
+  } else {
+    gfx::NativeTheme::ExtraParams extra;
+    gfx::NativeTheme::State state = delegate_->GetThemeState(&extra);
+    native_theme->Paint(skia_canvas, part, state, rect, extra);
+  }
+}
+
+}  // namespace views
diff --git a/views/native_theme_painter.h b/views/native_theme_painter.h
new file mode 100644
index 0000000..75b8866
--- /dev/null
+++ b/views/native_theme_painter.h
@@ -0,0 +1,79 @@
+// Copyright (c) 2011 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.
+
+#ifndef VIEWS_NATIVE_THEME_PAINTER_H_
+#define VIEWS_NATIVE_THEME_PAINTER_H_
+#pragma once
+
+#include "base/compiler_specific.h"
+#include "ui/gfx/native_theme.h"
+#include "views/painter.h"
+
+namespace gfx {
+class Canvas;
+class Size;
+}
+
+namespace ui {
+class Animation;
+}
+
+namespace views {
+
+// A Painter that uses NativeTheme to implement painting and sizing.  A
+// theme delegate must be given at construction time so that the appropriate
+// painting and sizing can be done.
+class NativeThemePainter : public Painter {
+ public:
+  // A delagate that supports animating transtions between different native
+  // theme states.  If animation is onging, the native theme painter will
+  // composite the foreground state over the backgroud state using an alpha
+  // between 0 and 255 based on the current value of the animation.
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+
+    // Get the part that this native theme painter should draw.
+    virtual gfx::NativeTheme::Part GetThemePart() const = 0;
+
+    // Get the state of the part, along with any extra data needed for painting.
+    virtual gfx::NativeTheme::State GetThemeState(
+        gfx::NativeTheme::ExtraParams* params) const = 0;
+
+    // If the native theme painter is animated, return the Animation object
+    // that is controlling it.  If no animation is ongoing, NULL may be
+    // returned.
+    virtual ui::Animation* GetThemeAnimation() const = 0;
+
+    // If animation is onging, this returns the background native theme state.
+    virtual gfx::NativeTheme::State GetBackgroundThemeState(
+        gfx::NativeTheme::ExtraParams* params) const = 0;
+
+    // If animation is onging, this returns the foreground native theme state.
+    // This state will be composited over the background using an alpha value
+    // based on the current value of the animation.
+    virtual gfx::NativeTheme::State GetForegroundThemeState(
+        gfx::NativeTheme::ExtraParams* params) const = 0;
+  };
+
+  explicit NativeThemePainter(Delegate* delegate);
+
+  virtual ~NativeThemePainter() {}
+
+  // Returns the preferred size of the native part being painted.
+  gfx::Size GetPreferredSize();
+
+ private:
+  // The delegate the controls the appearance of this painter.
+  Delegate* delegate_;
+
+  // Overridden from Painter:
+  virtual void Paint(int w, int h, gfx::Canvas* canvas) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeThemePainter);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_NATIVE_THEME_PAINTER_H_
\ No newline at end of file
diff --git a/views/views.gyp b/views/views.gyp
index c7fac12..deca1c4 100644
--- a/views/views.gyp
+++ b/views/views.gyp
@@ -311,6 +311,8 @@
         'metrics_win.cc',
         'mouse_watcher.cc',
         'mouse_watcher.h',
+        'native_theme_painter.cc',
+        'native_theme_painter.h',
         'painter.cc',
         'painter.h',
         'repeat_controller.cc',
@@ -587,6 +589,8 @@
         'examples/message_box_example.h',
         'examples/menu_example.cc',
         'examples/menu_example.h',
+        'examples/native_theme_button_example.cc',
+        'examples/native_theme_button_example.h',
         'examples/radio_button_example.cc',
         'examples/radio_button_example.h',
         'examples/scroll_view_example.cc',