Reland Remove NativeTabbedPane[Win|Wrapper]; promote Views impl.

ui/views/controls/tabbed_pane/tabbed_pane.cc

 // Copyright (c) 2012 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/views/controls/tabbed_pane/tabbed_pane.h"
 
 #include "base/logging.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/keycodes/keyboard_codes.h"
-#include "ui/views/controls/native/native_view_host.h"
-#include "ui/views/controls/tabbed_pane/native_tabbed_pane_views.h"
-#include "ui/views/controls/tabbed_pane/native_tabbed_pane_wrapper.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/font.h"
+#include "ui/views/controls/label.h"
 #include "ui/views/controls/tabbed_pane/tabbed_pane_listener.h"
+#include "ui/views/layout/layout_manager.h"
 #include "ui/views/widget/widget.h"
 
-// TODO(markusheintz): This should be removed once the native Windows tabbed
-// pane is not used anymore (http://crbug.com/138059).
-#if defined(OS_WIN) && !defined(USE_AURA)
-#include "ui/views/controls/tabbed_pane/native_tabbed_pane_win.h"
-#endif
-
 namespace {
 
-views::NativeTabbedPaneWrapper* CreateNativeWrapper(
-    views::TabbedPane* tabbed_pane) {
-#if defined(OS_WIN) && !defined(USE_AURA)
-  if (tabbed_pane->use_native_win_control())
-    return new views::NativeTabbedPaneWin(tabbed_pane);
-#endif
-  return new views::NativeTabbedPaneViews(tabbed_pane);
-}
+const char kViewClassName[] = "views/TabbedPane";
+
+// TODO(markusheintz|msw): Use NativeTheme colors.
+const SkColor kTabTitleColor_Inactive = SkColorSetRGB(0x66, 0x66, 0x66);
+const SkColor kTabTitleColor_Active = SkColorSetRGB(0x20, 0x20, 0x20);
+const SkColor kTabTitleColor_Pressed = SkColorSetRGB(0x33, 0x33, 0x33);
+const SkColor kTabTitleColor_Hovered = SkColorSetRGB(0x22, 0x22, 0x22);
+const SkColor kTabBackgroundColor = SK_ColorWHITE;
+const SkColor kTabBorderColor = SkColorSetRGB(0xCC, 0xCC, 0xCC);
+const SkScalar kTabBorderThickness = 1.0f;
+const SkScalar kTabBorderRadius = 2.0f;
 
 }  // namespace
 
 namespace views {
 
-// static
-const char TabbedPane::kViewClassName[] = "views/TabbedPane";
+// The tab view shown in the tab strip.
+class Tab : public View {
+ public:
+  Tab(TabbedPane* tabbed_pane, const string16& title, View* contents);
+  virtual ~Tab();
+
+  View* contents() const { return contents_; }
+
+  bool selected() const { return contents_->visible(); }
+  void SetSelected(bool selected);
+
+  // Overridden from View:
+  virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseCaptureLost() OVERRIDE;
+  virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
+  virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void Layout() OVERRIDE;
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+
+ private:
+  void SetTitleColor(SkColor color);
+  void PaintTabBorder(gfx::Canvas* canvas);
+
+  TabbedPane* tabbed_pane_;
+  Label* title_;
+  // The content view associated with this tab.
+  View* contents_;
+
+  DISALLOW_COPY_AND_ASSIGN(Tab);
+};
+
+// The tab strip shown above the tab contents.
+class TabStrip : public View {
+ public:
+  TabStrip();
+  virtual ~TabStrip();
+
+  // Overridden from View:
+  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual void Layout() OVERRIDE;
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TabStrip);
+};
+
+Tab::Tab(TabbedPane* tabbed_pane, const string16& title, View* contents)
+    : tabbed_pane_(tabbed_pane),
+      title_(new Label(title, gfx::Font().DeriveFont(0, gfx::Font::BOLD))),
+      contents_(contents) {
+  SetTitleColor(kTabTitleColor_Inactive);
+  AddChildView(title_);
+}
+
+Tab::~Tab() {}
+
+void Tab::SetSelected(bool selected) {
+  contents_->SetVisible(selected);
+  SetTitleColor(selected ? kTabTitleColor_Active : kTabTitleColor_Inactive);
+}
+
+bool Tab::OnMousePressed(const ui::MouseEvent& event) {
+  SetTitleColor(kTabTitleColor_Pressed);
+  return true;
+}
+
+void Tab::OnMouseReleased(const ui::MouseEvent& event) {
+  SetTitleColor(selected() ? kTabTitleColor_Active : kTabTitleColor_Hovered);
+  if (GetLocalBounds().Contains(event.location()))
+    tabbed_pane_->SelectTab(this);
+}
+
+void Tab::OnMouseCaptureLost() {
+  SetTitleColor(kTabTitleColor_Inactive);
+}
+
+void Tab::OnMouseEntered(const ui::MouseEvent& event) {
+  SetTitleColor(selected() ? kTabTitleColor_Active : kTabTitleColor_Hovered);
+}
+
+void Tab::OnMouseExited(const ui::MouseEvent& event) {
+  SetTitleColor(selected() ? kTabTitleColor_Active : kTabTitleColor_Inactive);
+}
+
+void Tab::OnGestureEvent(ui::GestureEvent* event) {
+  switch (event->type()) {
+    case ui::ET_GESTURE_TAP_DOWN:
+      SetTitleColor(kTabTitleColor_Pressed);
+      break;
+    case ui::ET_GESTURE_TAP:
+      // SelectTab also sets the right tab color.
+      tabbed_pane_->SelectTab(this);
+      break;
+    case ui::ET_GESTURE_TAP_CANCEL:
+      SetTitleColor(selected() ?
+          kTabTitleColor_Active : kTabTitleColor_Inactive);
+      break;
+    default:
+      break;
+  }
+  event->SetHandled();
+}
+
+gfx::Size Tab::GetPreferredSize() {
+  gfx::Size size(title_->GetPreferredSize());
+  size.Enlarge(30, 10);
+  const int kTabMinWidth = 54;
+  if (size.width() < kTabMinWidth)
+    size.set_width(kTabMinWidth);
+  return size;
+}
+
+void Tab::Layout() {
+  gfx::Rect bounds = GetLocalBounds();
+  bounds.ClampToCenteredSize(title_->GetPreferredSize());
+  title_->SetBoundsRect(bounds);
+}
+
+void Tab::OnPaint(gfx::Canvas* canvas) {
+  if (selected()) {
+    canvas->DrawColor(kTabBackgroundColor);
+    PaintTabBorder(canvas);
+  }
+  View::OnPaint(canvas);
+}
+
+void Tab::SetTitleColor(SkColor color) {
+  title_->SetEnabledColor(color);
+  SchedulePaint();
+}
+
+void Tab::PaintTabBorder(gfx::Canvas* canvas) {
+  SkPath path;
+  // Clip the bottom of the border by extending its rect height beyond the tab.
+  const int tab_height = height() + kTabBorderThickness;
+  SkRect bounds = { 0, 0, SkIntToScalar(width()), SkIntToScalar(tab_height) };
+  SkScalar radii[8] = { kTabBorderRadius, kTabBorderRadius,
+                        kTabBorderRadius, kTabBorderRadius,
+                        0, 0,
+                        0, 0 };
+  path.addRoundRect(bounds, radii, SkPath::kCW_Direction);
+
+  SkPaint paint;
+  paint.setAntiAlias(true);
+  paint.setStyle(SkPaint::kStroke_Style);
+  paint.setColor(kTabBorderColor);
+  paint.setStrokeWidth(kTabBorderThickness * 2);
+  canvas->DrawPath(path, paint);
+}
+
+TabStrip::TabStrip() {
+  const int kCount = 4;
+  // This gradient is designed to mach WebUI tabbed panes.
+  SkColor colors[kCount] = {
+      SkColorSetRGB(0xff, 0xff, 0xff),
+      SkColorSetRGB(0xff, 0xff, 0xff),
+      SkColorSetRGB(0xfa, 0xfa, 0xfa),
+      SkColorSetRGB(0xf2, 0xf2, 0xf2)
+  };
+  SkScalar pos[kCount] = { 0.0f, 0.6f, 0.8f, 1.0f };
+  set_background(Background::CreateVerticalMultiColorGradientBackground(
+      colors, pos, kCount));
+}
+
+TabStrip::~TabStrip() {}
+
+gfx::Size TabStrip::GetPreferredSize() {
+  gfx::Size size;
+  for (int i = 0; i < child_count(); ++i) {
+    const gfx::Size child_size = child_at(i)->GetPreferredSize();
+    size.SetSize(size.width() + child_size.width(),
+                 std::max(size.height(), child_size.height()));
+  }
+  return size;
+}
+
+void TabStrip::Layout() {
+  const int kTabOffset = 18;
+  int x = kTabOffset;  // Layout tabs with an offset to the tabstrip border.
+  for (int i = 0; i < child_count(); ++i) {
+    gfx::Size ps = child_at(i)->GetPreferredSize();
+    child_at(i)->SetBounds(x, 0, ps.width(), ps.height());
+    x = child_at(i)->bounds().right();
+  }
+}
+
+void TabStrip::OnPaint(gfx::Canvas* canvas) {
+  OnPaintBackground(canvas);
+
+  // Draw the TabStrip border.
+  SkPaint paint;
+  paint.setColor(kTabBorderColor);
+  paint.setStrokeWidth(kTabBorderThickness);
+  SkScalar line_y = SkIntToScalar(height()) - kTabBorderThickness;
+  SkScalar line_width = SkIntToScalar(width());
+  canvas->sk_canvas()->drawLine(0, line_y, line_width, line_y, paint);
+}
 
 TabbedPane::TabbedPane()
-  : native_tabbed_pane_(NULL),
-#if defined(OS_WIN) && !defined(USE_AURA)
-    use_native_win_control_(false),
-#endif
-    listener_(NULL) {
+  : listener_(NULL),
+    tab_strip_(new TabStrip()),
+    contents_(new View()),
+    selected_tab_index_(-1) {
   set_focusable(true);
-}
-
-TabbedPane::~TabbedPane() {
-}
+  AddChildView(tab_strip_);
+  AddChildView(contents_);
+}
+
+TabbedPane::~TabbedPane() {}
 
 int TabbedPane::GetTabCount() {
-  return native_tabbed_pane_->GetTabCount();
-}
-
-int TabbedPane::GetSelectedTabIndex() {
-  return native_tabbed_pane_->GetSelectedTabIndex();
+  DCHECK_EQ(tab_strip_->child_count(), contents_->child_count());
+  return contents_->child_count();
 }
 
 View* TabbedPane::GetSelectedTab() {
-  return native_tabbed_pane_->GetSelectedTab();
+  return selected_tab_index() < 0 ?
+      NULL : GetTabAt(selected_tab_index())->contents();
 }
 
 void TabbedPane::AddTab(const string16& title, View* contents) {
-  native_tabbed_pane_->AddTab(title, contents);
-  PreferredSizeChanged();
+  AddTabAtIndex(tab_strip_->child_count(), title, contents);
 }
 
 void TabbedPane::AddTabAtIndex(int index,
                                const string16& title,
-                               View* contents,
-                               bool select_if_first_tab) {
-  native_tabbed_pane_->AddTabAtIndex(index, title, contents,
-                                     select_if_first_tab);
+                               View* contents) {
+  DCHECK(index >= 0 && index <= GetTabCount());
+  contents->SetVisible(false);
+
+  tab_strip_->AddChildViewAt(new Tab(this, title, contents), index);
+  contents_->AddChildViewAt(contents, index);
+  if (selected_tab_index() < 0)
+    SelectTabAt(index);
+
   PreferredSizeChanged();
 }
 
-View* TabbedPane::RemoveTabAtIndex(int index) {
-  View* tab = native_tabbed_pane_->RemoveTabAtIndex(index);
-  PreferredSizeChanged();
-  return tab;
-}
-
 void TabbedPane::SelectTabAt(int index) {
-  native_tabbed_pane_->SelectTabAt(index);
-}
-
-void TabbedPane::SetAccessibleName(const string16& name) {
-  accessible_name_ = name;
+  DCHECK(index >= 0 && index < GetTabCount());
+  if (index == selected_tab_index())
+    return;
+
+  if (selected_tab_index() >= 0)
+    GetTabAt(selected_tab_index())->SetSelected(false);
+
+  selected_tab_index_ = index;
+  Tab* tab = GetTabAt(index);
+  tab->SetSelected(true);
+  tab_strip_->SchedulePaint();
+
+  FocusManager* focus_manager = tab->contents()->GetFocusManager();
+  if (focus_manager) {
+    const View* focused_view = focus_manager->GetFocusedView();
+    if (focused_view && contents_->Contains(focused_view) &&
+        !tab->contents()->Contains(focused_view))
+      focus_manager->SetFocusedView(tab->contents());
+  }
+
+  if (listener())
+    listener()->TabSelectedAt(index);
+}
+
+void TabbedPane::SelectTab(Tab* tab) {
+  const int index = tab_strip_->GetIndexOf(tab);
+  if (index >= 0)
+    SelectTabAt(index);
 }
 
 gfx::Size TabbedPane::GetPreferredSize() {
-  return native_tabbed_pane_ ?
-      native_tabbed_pane_->GetPreferredSize() : gfx::Size();
-}
-
-void TabbedPane::LoadAccelerators() {
-  // Ctrl+Shift+Tab
-  AddAccelerator(ui::Accelerator(ui::VKEY_TAB,
-                                 ui::EF_CONTROL_DOWN | ui::EF_SHIFT_DOWN));
-  // Ctrl+Tab
-  AddAccelerator(ui::Accelerator(ui::VKEY_TAB, ui::EF_CONTROL_DOWN));
+  gfx::Size size;
+  for (int i = 0; i < contents_->child_count(); ++i)
+    size.ClampToMin(contents_->child_at(i)->GetPreferredSize());
+  size.Enlarge(0, tab_strip_->GetPreferredSize().height());
+  return size;
+}
+
+Tab* TabbedPane::GetTabAt(int index) {
+  return static_cast<Tab*>(tab_strip_->child_at(index));
 }
 
 void TabbedPane::Layout() {
-  if (native_tabbed_pane_)
-    native_tabbed_pane_->GetView()->SetBounds(0, 0, width(), height());
+  const gfx::Size size = tab_strip_->GetPreferredSize();
+  tab_strip_->SetBounds(0, 0, width(), size.height());
+  contents_->SetBounds(0, tab_strip_->bounds().bottom(), width(),
+                       std::max(0, height() - size.height()));
+  for (int i = 0; i < contents_->child_count(); ++i)
+    contents_->child_at(i)->SetSize(contents_->size());
 }
 
 void TabbedPane::ViewHierarchyChanged(bool is_add, View* parent, View* child) {
-  if (is_add && !native_tabbed_pane_) {
-    // The native wrapper's lifetime will be managed by the view hierarchy after
-    // we call AddChildView.
-    native_tabbed_pane_ = CreateNativeWrapper(this);
-    AddChildView(native_tabbed_pane_->GetView());
-    LoadAccelerators();
+  if (is_add) {
+    // Support navigating tabs by Ctrl+Tab and Ctrl+Shift+Tab.
+    AddAccelerator(ui::Accelerator(ui::VKEY_TAB,
+                                   ui::EF_CONTROL_DOWN | ui::EF_SHIFT_DOWN));
+    AddAccelerator(ui::Accelerator(ui::VKEY_TAB, ui::EF_CONTROL_DOWN));
   }
 }
 
 bool TabbedPane::AcceleratorPressed(const ui::Accelerator& accelerator) {
-  // We only accept Ctrl+Tab keyboard events.
+  // Handle Ctrl+Tab and Ctrl+Shift+Tab navigation of pages.
   DCHECK(accelerator.key_code() == ui::VKEY_TAB && accelerator.IsCtrlDown());
-
-  int tab_count = GetTabCount();
+  const int tab_count = GetTabCount();
   if (tab_count <= 1)
     return false;
-  int selected_tab_index = GetSelectedTabIndex();
-  int next_tab_index = accelerator.IsShiftDown() ?
-      (selected_tab_index - 1) % tab_count :
-      (selected_tab_index + 1) % tab_count;
+  const int increment = accelerator.IsShiftDown() ? -1 : 1;
+  int next_tab_index = (selected_tab_index() + increment) % tab_count;
   // Wrap around.
   if (next_tab_index < 0)
     next_tab_index += tab_count;
   SelectTabAt(next_tab_index);
   return true;
 }
 
 std::string TabbedPane::GetClassName() const {
   return kViewClassName;
 }
 
 void TabbedPane::OnFocus() {
-  // Forward the focus to the wrapper.
-  if (native_tabbed_pane_) {
-    native_tabbed_pane_->SetFocus();
+  View::OnFocus();
 
-    View* selected_tab = GetSelectedTab();
-    if (selected_tab) {
-      selected_tab->GetWidget()->NotifyAccessibilityEvent(
-          selected_tab, ui::AccessibilityTypes::EVENT_FOCUS, true);
-    }
-  } else {
-    View::OnFocus();  // Will focus the RootView window (so we still get
-                      // keyboard messages).
+  View* selected_tab = GetSelectedTab();
+  if (selected_tab) {
+    selected_tab->GetWidget()->NotifyAccessibilityEvent(
+        selected_tab, ui::AccessibilityTypes::EVENT_FOCUS, true);
   }
 }
 
-void TabbedPane::OnPaintFocusBorder(gfx::Canvas* canvas) {
-  if (NativeViewHost::kRenderNativeControlFocus)
-    View::OnPaintFocusBorder(canvas);
-}
-
 void TabbedPane::GetAccessibleState(ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_PAGETABLIST;
-  state->name = accessible_name_;
 }
 
 }  // namespace views