src/chrome/browser/ui/libgtk2ui/gtk2_border.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/libgtk2ui/gtk2_border.h"
   6
   7 #include <gtk/gtk.h>
   8
   9 #include "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
  10 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
  11 #include "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
  12 #include "third_party/skia/include/effects/SkLerpXfermode.h"
  13 #include "ui/base/theme_provider.h"
  14 #include "ui/gfx/animation/animation.h"
  15 #include "ui/gfx/canvas.h"
  16 #include "ui/gfx/image/image_skia_source.h"
  17 #include "ui/gfx/rect.h"
  18 #include "ui/gfx/skia_util.h"
  19 #include "ui/views/controls/button/blue_button.h"
  20 #include "ui/views/controls/button/label_button.h"
  21 #include "ui/views/controls/button/label_button_border.h"
  22 #include "ui/views/native_theme_delegate.h"
  23
  24 using views::Button;
  25 using views::NativeThemeDelegate;
  26
  27 namespace libgtk2ui {
  28
  29 namespace {
  30
  31 const int kNumberOfFocusedStates = 2;
  32
  33 class ButtonImageSkiaSource : public gfx::ImageSkiaSource {
  34  public:
  35   ButtonImageSkiaSource(const Gtk2UI* gtk2_ui,
  36                         const GtkStateType state,
  37                         const bool focused,
  38                         const bool call_to_action,
  39                         const gfx::Size& size)
  40       : gtk2_ui_(gtk2_ui),
  41         state_(state),
  42         focused_(focused),
  43         call_to_action_(call_to_action),
  44         size_(size) {
  45   }
  46
  47   ~ButtonImageSkiaSource() override {}
  48
  49   gfx::ImageSkiaRep GetImageForScale(float scale) override {
  50     int w = size_.width() * scale;
  51     int h = size_.height() * scale;
  52     return gfx::ImageSkiaRep(
  53         gtk2_ui_->DrawGtkButtonBorder(state_, focused_, call_to_action_, w, h),
  54         scale);
  55   }
  56
  57  private:
  58   const Gtk2UI* gtk2_ui_;
  59   const GtkStateType state_;
  60   const bool focused_;
  61   const bool call_to_action_;
  62   const gfx::Size size_;
  63
  64   DISALLOW_COPY_AND_ASSIGN(ButtonImageSkiaSource);
  65 };
  66
  67 }  // namespace
  68
  69 Gtk2Border::Gtk2Border(Gtk2UI* gtk2_ui,
  70                        views::LabelButton* owning_button,
  71                        scoped_ptr<views::LabelButtonBorder> border)
  72     : gtk2_ui_(gtk2_ui),
  73       owning_button_(owning_button),
  74       border_(border.Pass()),
  75       observer_manager_(this) {
  76   observer_manager_.Add(NativeThemeGtk2::instance());
  77 }
  78
  79 Gtk2Border::~Gtk2Border() {
  80 }
  81
  82 void Gtk2Border::Paint(const views::View& view, gfx::Canvas* canvas) {
  83   DCHECK_EQ(&view, owning_button_);
  84   const NativeThemeDelegate* native_theme_delegate = owning_button_;
  85   gfx::Rect rect(native_theme_delegate->GetThemePaintRect());
  86   ui::NativeTheme::ExtraParams extra;
  87   ui::NativeTheme::State state = native_theme_delegate->GetThemeState(&extra);
  88
  89   const gfx::Animation* animation = native_theme_delegate->GetThemeAnimation();
  90   if (animation && animation->is_animating()) {
  91     // Linearly interpolate background and foreground painters during animation.
  92     const SkRect sk_rect = gfx::RectToSkRect(rect);
  93     canvas->sk_canvas()->saveLayer(&sk_rect, NULL);
  94     state = native_theme_delegate->GetBackgroundThemeState(&extra);
  95     PaintState(state, extra, rect, canvas);
  96
  97     SkPaint paint;
  98     skia::RefPtr<SkXfermode> sk_lerp_xfer =
  99         skia::AdoptRef(SkLerpXfermode::Create(animation->GetCurrentValue()));
 100     paint.setXfermode(sk_lerp_xfer.get());
 101     canvas->sk_canvas()->saveLayer(&sk_rect, &paint);
 102     state = native_theme_delegate->GetForegroundThemeState(&extra);
 103     PaintState(state, extra, rect, canvas);
 104     canvas->sk_canvas()->restore();
 105
 106     canvas->sk_canvas()->restore();
 107   } else {
 108     PaintState(state, extra, rect, canvas);
 109   }
 110 }
 111
 112 gfx::Insets Gtk2Border::GetInsets() const {
 113   return border_->GetInsets();
 114 }
 115
 116 gfx::Size Gtk2Border::GetMinimumSize() const {
 117   return border_->GetMinimumSize();
 118 }
 119
 120 void Gtk2Border::OnNativeThemeUpdated(ui::NativeTheme* observed_theme) {
 121   DCHECK_EQ(observed_theme, NativeThemeGtk2::instance());
 122   for (int i = 0; i < kNumberOfFocusedStates; ++i) {
 123     for (int j = 0; j < views::Button::STATE_COUNT; ++j) {
 124       button_images_[i][j] = gfx::ImageSkia();
 125     }
 126   }
 127
 128   // Our owning view must have its layout invalidated because the insets could
 129   // have changed.
 130   owning_button_->InvalidateLayout();
 131 }
 132
 133 void Gtk2Border::PaintState(const ui::NativeTheme::State state,
 134                             const ui::NativeTheme::ExtraParams& extra,
 135                             const gfx::Rect& rect,
 136                             gfx::Canvas* canvas) {
 137   bool focused = extra.button.is_focused;
 138   Button::ButtonState views_state = Button::GetButtonStateFrom(state);
 139
 140   if (border_->GetPainter(focused, views_state) ||
 141       (focused && border_->GetPainter(false, views_state))) {
 142     gfx::ImageSkia* image = &button_images_[focused][views_state];
 143
 144     if (image->isNull() || image->size() != rect.size()) {
 145       bool call_to_action = owning_button_->GetClassName() ==
 146           views::BlueButton::kViewClassName;
 147       GtkStateType gtk_state = GetGtkState(state);
 148       *image = gfx::ImageSkia(
 149           new ButtonImageSkiaSource(gtk2_ui_,
 150                                     gtk_state,
 151                                     focused,
 152                                     call_to_action,
 153                                     rect.size()),
 154           rect.size());
 155     }
 156     canvas->DrawImageInt(*image, rect.x(), rect.y());
 157   }
 158 }
 159
 160 }  // namespace libgtk2ui