linux_aura: Use GTK button borders in GTK theme mode.

chrome/browser/ui/libgtk2ui/gtk2_border.cc

+// Copyright 2014 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 "chrome/browser/ui/libgtk2ui/gtk2_border.h"
+
+#include <gtk/gtk.h>
+
+#include "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image_skia_source.h"
+#include "ui/views/controls/button/custom_button.h"
+
+namespace libgtk2ui {
+
+namespace {
+
+GtkStateType ViewsToGtkState(views::Button::ButtonState state) {
+  switch (state) {
+    case views::Button::STATE_HOVERED:
+      return GTK_STATE_PRELIGHT;
+    case views::Button::STATE_PRESSED:
+      return GTK_STATE_ACTIVE;
+    case views::Button::STATE_DISABLED:
+      return GTK_STATE_INSENSITIVE;
+    default:
+      return GTK_STATE_NORMAL;
+  }
+}
+
+class ButtonImageSkiaSource : public gfx::ImageSkiaSource {
+ public:
+  ButtonImageSkiaSource(const Gtk2UI* gtk2_ui,
+                        GtkStateType state,
+                        const gfx::Size& size)
+      : gtk2_ui_(gtk2_ui),
+        state_(state),
+        size_(size) {
+  }
+
+  virtual ~ButtonImageSkiaSource() {
+  }
+
+  virtual gfx::ImageSkiaRep GetImageForScale(float scale) OVERRIDE {
+    int w = size_.width() * scale;
+    int h = size_.height() * scale;
+    return gfx::ImageSkiaRep(
+        gtk2_ui_->DrawGtkButtonBorder(state_, w, h), scale);
+  }
+
+ private:
+  const Gtk2UI* gtk2_ui_;
+  GtkStateType state_;

[sky, 2014/01/22 20:23:59]

nit: const and this and size_.

+  gfx::Size size_;
+
+  DISALLOW_COPY_AND_ASSIGN(ButtonImageSkiaSource);
+};
+
+}  // namespace
+
+Gtk2Border::Gtk2Border(Gtk2UI* gtk2_ui,
+                       views::CustomButton* owning_button,
+                       views::Border* border)
+    : gtk2_ui_(gtk2_ui),
+      use_gtk_(gtk2_ui_->GetUseSystemTheme()),
+      owning_button_(owning_button),
+      border_(border) {
+  gtk2_ui_->AddGtkBorder(this);
+}
+
+Gtk2Border::~Gtk2Border() {
+  gtk2_ui_->RemoveGtkBorder(this);
+}
+
+void Gtk2Border::InvalidateAndSetUsesGtk(bool use_gtk) {
+  hovered_ = gfx::ImageSkia();
+  pressed_ = gfx::ImageSkia();
+
+  // Our owning view must have its layout invalidated because the insets could
+  // have changed.
+  owning_button_->InvalidateLayout();
+
+  use_gtk_ = use_gtk;
+}
+
+void Gtk2Border::Paint(const views::View& view, gfx::Canvas* canvas) {
+  if (!use_gtk_) {
+    border_->Paint(view, canvas);
+    return;
+  }
+
+  DCHECK_EQ(&view, owning_button_);
+  GtkStateType state = ViewsToGtkState(owning_button_->state());
+
+  if (state == GTK_STATE_PRELIGHT) {
+    if (hovered_.isNull() || hovered_.size() != view.size()) {
+      hovered_ = gfx::ImageSkia(
+          new ButtonImageSkiaSource(gtk2_ui_, state, view.size()), view.size());
+    }
+
+    canvas->DrawImageInt(hovered_, 0, 0);
+  } else if (state == GTK_STATE_ACTIVE) {
+    if (pressed_.isNull() || pressed_.size() != view.size()) {
+      pressed_ = gfx::ImageSkia(
+          new ButtonImageSkiaSource(gtk2_ui_, state, view.size()), view.size());
+    }
+
+    canvas->DrawImageInt(pressed_, 0, 0);
+  }
+}
+
+gfx::Insets Gtk2Border::GetInsets() const {
+  if (!use_gtk_)
+    return border_->GetInsets();
+
+  return gtk2_ui_->GetButtonInsets();
+}
+
+gfx::Size Gtk2Border::GetMinimumSize() const {
+  if (!use_gtk_)
+    return border_->GetMinimumSize();
+
+  gfx::Insets insets = GetInsets();
+  return gfx::Size(insets.width(), insets.height());
+}
+
+}  // namespace libgtk2ui