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/native_theme_gtk2.h"
  11 #include "third_party/skia/include/effects/SkLerpXfermode.h"
  12 #include "ui/base/theme_provider.h"
  13 #include "ui/gfx/animation/animation.h"
  14 #include "ui/gfx/canvas.h"
  15 #include "ui/gfx/image/image_skia_source.h"
  16 #include "ui/gfx/rect.h"
  17 #include "ui/gfx/skia_util.h"
  18 #include "ui/views/controls/button/label_button.h"
  19 #include "ui/views/native_theme_delegate.h"
  20
  21 using views::Button;
  22 using views::NativeThemeDelegate;
  23
  24 namespace libgtk2ui {
  25
  26 namespace {
  27
  28 const int kNumberOfFocusedStates = 2;
  29
  30 GtkStateType GetGtkState(ui::NativeTheme::State state) {
  31   switch (state) {
  32     case ui::NativeTheme::kDisabled: return GTK_STATE_INSENSITIVE;
  33     case ui::NativeTheme::kHovered:  return GTK_STATE_PRELIGHT;
  34     case ui::NativeTheme::kNormal:   return GTK_STATE_NORMAL;
  35     case ui::NativeTheme::kPressed:  return GTK_STATE_ACTIVE;
  36     case ui::NativeTheme::kMaxState: NOTREACHED() << "Unknown state: " << state;
  37   }
  38   return GTK_STATE_NORMAL;
  39 }
  40
  41 class ButtonImageSkiaSource : public gfx::ImageSkiaSource {
  42  public:
  43   ButtonImageSkiaSource(const Gtk2UI* gtk2_ui,
  44                         const GtkStateType state,
  45                         const bool focused,
  46                         const gfx::Size& size)
  47       : gtk2_ui_(gtk2_ui),
  48         state_(state),
  49         focused_(focused),
  50         size_(size) {
  51   }
  52
  53   virtual ~ButtonImageSkiaSource() {
  54   }
  55
  56   virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
  57     int w = size_.width() * scale;
  58     int h = size_.height() * scale;
  59     return gfx::ImageSkiaRep(
  60         gtk2_ui_->DrawGtkButtonBorder(state_, focused_, w, h), scale);
  61   }
  62
  63  private:
  64   const Gtk2UI* gtk2_ui_;
  65   const GtkStateType state_;
  66   const bool focused_;
  67   const gfx::Size size_;
  68
  69   DISALLOW_COPY_AND_ASSIGN(ButtonImageSkiaSource);
  70 };
  71
  72 }  // namespace
  73
  74 Gtk2Border::Gtk2Border(Gtk2UI* gtk2_ui,
  75                        views::LabelButton* owning_button)
  76     : gtk2_ui_(gtk2_ui),
  77       owning_button_(owning_button),
  78       observer_manager_(this) {
  79   observer_manager_.Add(NativeThemeGtk2::instance());
  80 }
  81
  82 Gtk2Border::~Gtk2Border() {
  83 }
  84
  85 void Gtk2Border::Paint(const views::View& view, gfx::Canvas* canvas) {
  86   DCHECK_EQ(&view, owning_button_);
  87   const NativeThemeDelegate* native_theme_delegate = owning_button_;
  88   gfx::Rect rect(native_theme_delegate->GetThemePaintRect());
  89   ui::NativeTheme::ExtraParams extra;
  90   ui::NativeTheme::State state = native_theme_delegate->GetThemeState(&extra);
  91
  92   const gfx::Animation* animation = native_theme_delegate->GetThemeAnimation();
  93   if (animation && animation->is_animating()) {
  94     // Linearly interpolate background and foreground painters during animation.
  95     const SkRect sk_rect = gfx::RectToSkRect(rect);
  96     canvas->sk_canvas()->saveLayer(&sk_rect, NULL);
  97     state = native_theme_delegate->GetBackgroundThemeState(&extra);
  98     PaintState(state, extra, rect, canvas);
  99
 100     SkPaint paint;
 101     skia::RefPtr<SkXfermode> sk_lerp_xfer =
 102         skia::AdoptRef(SkLerpXfermode::Create(animation->GetCurrentValue()));
 103     paint.setXfermode(sk_lerp_xfer.get());
 104     canvas->sk_canvas()->saveLayer(&sk_rect, &paint);
 105     state = native_theme_delegate->GetForegroundThemeState(&extra);
 106     PaintState(state, extra, rect, canvas);
 107     canvas->sk_canvas()->restore();
 108
 109     canvas->sk_canvas()->restore();
 110   } else {
 111     PaintState(state, extra, rect, canvas);
 112   }
 113 }
 114
 115 gfx::Insets Gtk2Border::GetInsets() const {
 116   // On STYLE_TEXTUBTTON, we want the smaller insets so we can fit the GTK icon
 117   // in the toolbar without cutting off the edges of the GTK image.
 118   return gtk2_ui_->GetButtonInsets();
 119 }
 120
 121 gfx::Size Gtk2Border::GetMinimumSize() const {
 122   gfx::Insets insets = GetInsets();
 123   return gfx::Size(insets.width(), insets.height());
 124 }
 125
 126 void Gtk2Border::OnNativeThemeUpdated(ui::NativeTheme* observed_theme) {
 127   DCHECK_EQ(observed_theme, NativeThemeGtk2::instance());
 128   for (int i = 0; i < kNumberOfFocusedStates; ++i) {
 129     for (int j = 0; j < views::Button::STATE_COUNT; ++j) {
 130       button_images_[i][j] = gfx::ImageSkia();
 131     }
 132   }
 133
 134   // Our owning view must have its layout invalidated because the insets could
 135   // have changed.
 136   owning_button_->InvalidateLayout();
 137 }
 138
 139 void Gtk2Border::PaintState(const ui::NativeTheme::State state,
 140                             const ui::NativeTheme::ExtraParams& extra,
 141                             const gfx::Rect& rect,
 142                             gfx::Canvas* canvas) {
 143   bool focused = extra.button.is_focused;
 144   Button::ButtonState views_state = Button::GetButtonStateFrom(state);
 145
 146   if (ShouldDrawBorder(focused, views_state)) {
 147     gfx::ImageSkia* image = &button_images_[focused][views_state];
 148
 149     if (image->isNull() || image->size() != rect.size()) {
 150       GtkStateType gtk_state = GetGtkState(state);
 151       *image = gfx::ImageSkia(
 152           new ButtonImageSkiaSource(gtk2_ui_, gtk_state, focused, rect.size()),
 153           rect.size());
 154     }
 155     canvas->DrawImageInt(*image, rect.x(), rect.y());
 156   }
 157 }
 158
 159 bool Gtk2Border::ShouldDrawBorder(bool focused,
 160                                   views::Button::ButtonState state) {
 161   // This logic should be kept in sync with the LabelButtonBorder constructor.
 162   if (owning_button_->style() == Button::STYLE_BUTTON) {
 163     return true;
 164   } else if (owning_button_->style() == Button::STYLE_TEXTBUTTON) {
 165     return focused == false && (state == Button::STATE_HOVERED ||
 166                                 state == Button::STATE_PRESSED);
 167   }
 168
 169   return false;
 170 }
 171
 172 }  // namespace libgtk2ui