views: Make view::Views::GetPreferredSize() const.

ui/views/controls/scrollbar/native_scroll_bar_views.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/scrollbar/native_scroll_bar_views.h"
 
 #include "base/logging.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/path.h"
@@ skipping 14 matching lines @@
   enum Type {
     UP,
     DOWN,
     LEFT,
     RIGHT,
   };
 
   ScrollBarButton(ButtonListener* listener, Type type);
   virtual ~ScrollBarButton();
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE {
     return "ScrollBarButton";
   }
 
  protected:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
 
  private:
   ui::NativeTheme::ExtraParams GetNativeThemeParams() const;
   ui::NativeTheme::Part GetNativeThemePart() const;
   ui::NativeTheme::State GetNativeThemeState() const;
 
   Type type_;
 };
 
 // Wrapper for the scroll thumb
 class ScrollBarThumb : public BaseScrollBarThumb {
  public:
   explicit ScrollBarThumb(BaseScrollBar* scroll_bar);
   virtual ~ScrollBarThumb();
 
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE {
     return "ScrollBarThumb";
   }
 
  protected:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
 
  private:
   ui::NativeTheme::ExtraParams GetNativeThemeParams() const;
   ui::NativeTheme::Part GetNativeThemePart() const;
   ui::NativeTheme::State GetNativeThemeState() const;
 
   ScrollBar* scroll_bar_;
 };
 
 /////////////////////////////////////////////////////////////////////////////
 // ScrollBarButton
 
 ScrollBarButton::ScrollBarButton(ButtonListener* listener, Type type)
     : BaseScrollBarButton(listener),
       type_(type) {
   SetFocusable(false);
   SetAccessibilityFocusable(false);
 }
 
 ScrollBarButton::~ScrollBarButton() {
 }
 
-gfx::Size ScrollBarButton::GetPreferredSize() {
+gfx::Size ScrollBarButton::GetPreferredSize() const {
   return GetNativeTheme()->GetPartSize(GetNativeThemePart(),
                                        GetNativeThemeState(),
                                        GetNativeThemeParams());
 }
 
 void ScrollBarButton::OnPaint(gfx::Canvas* canvas) {
   gfx::Rect bounds(GetPreferredSize());
   GetNativeTheme()->Paint(canvas->sk_canvas(), GetNativeThemePart(),
                           GetNativeThemeState(), bounds,
                           GetNativeThemeParams());
@@ skipping 60 matching lines @@
 ScrollBarThumb::ScrollBarThumb(BaseScrollBar* scroll_bar)
     : BaseScrollBarThumb(scroll_bar),
       scroll_bar_(scroll_bar) {
   SetFocusable(false);
   SetAccessibilityFocusable(false);
 }
 
 ScrollBarThumb::~ScrollBarThumb() {
 }
 
-gfx::Size ScrollBarThumb::GetPreferredSize() {
+gfx::Size ScrollBarThumb::GetPreferredSize() const {
   return GetNativeTheme()->GetPartSize(GetNativeThemePart(),
                                        GetNativeThemeState(),
                                        GetNativeThemeParams());
 }
 
 void ScrollBarThumb::OnPaint(gfx::Canvas* canvas) {
   const gfx::Rect local_bounds(GetLocalBounds());
   const ui::NativeTheme::State theme_state = GetNativeThemeState();
   const ui::NativeTheme::ExtraParams extra_params(GetNativeThemeParams());
   GetNativeTheme()->Paint(canvas->sk_canvas(),
@@ skipping 107 matching lines @@
 
   params_.scrollbar_track.track_x = bounds.x();
   params_.scrollbar_track.track_y = bounds.y();
   params_.scrollbar_track.track_width = bounds.width();
   params_.scrollbar_track.track_height = bounds.height();
   params_.scrollbar_track.classic_state = 0;
 
   GetNativeTheme()->Paint(canvas->sk_canvas(), part_, state_, bounds, params_);
 }
 
-gfx::Size NativeScrollBarViews::GetPreferredSize() {
+gfx::Size NativeScrollBarViews::GetPreferredSize() const {
   const ui::NativeTheme* theme = native_scroll_bar_->GetNativeTheme();
   if (native_scroll_bar_->IsHorizontal())
     return gfx::Size(0, GetHorizontalScrollBarHeight(theme));
   return gfx::Size(GetVerticalScrollBarWidth(theme), 0);
 }
 
 const char* NativeScrollBarViews::GetClassName() const {
   return kViewClassName;
 }
 
@@ skipping 109 matching lines @@
   thumb_params.scrollbar_thumb.is_hovering = false;
   gfx::Size track_size = theme->GetPartSize(
       ui::NativeTheme::kScrollbarVerticalThumb,
       ui::NativeTheme::kNormal,
       thumb_params);
 
   return std::max(track_size.width(), button_size.width());
 }
 
 }  // namespace views