Write a NativeThemeGtk2 class for linux_aura.

chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc

+// Copyright (c) 2013 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/native_theme_gtk2.h"
+
+#include <gtk/gtk.h>
+
+#include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
+#include "ui/gfx/color_utils.h"
+#include "ui/gfx/path.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+#include "ui/native_theme/common_theme.h"
+
+namespace {
+
+// Theme colors returned by GetSystemColor().
+const SkColor kInvalidColorIdColor = SkColorSetRGB(255, 0, 128);
+// Tree
+const SkColor kTreeBackground = SK_ColorWHITE;
+const SkColor kTreeTextColor = SK_ColorBLACK;
+const SkColor kTreeSelectedTextColor = SK_ColorBLACK;
+const SkColor kTreeSelectionBackgroundColor = SkColorSetRGB(0xEE, 0xEE, 0xEE);
+const SkColor kTreeArrowColor = SkColorSetRGB(0x7A, 0x7A, 0x7A);
+// Table
+const SkColor kTableBackground = SK_ColorWHITE;
+const SkColor kTableTextColor = SK_ColorBLACK;
+const SkColor kTableSelectedTextColor = SK_ColorBLACK;
+const SkColor kTableSelectionBackgroundColor = SkColorSetRGB(0xEE, 0xEE, 0xEE);
+const SkColor kTableGroupingIndicatorColor = SkColorSetRGB(0xCC, 0xCC, 0xCC);
+
+}  // namespace
+
+
+namespace libgtk2ui {
+
+// static
+NativeThemeGtk2* NativeThemeGtk2::instance() {
+  CR_DEFINE_STATIC_LOCAL(NativeThemeGtk2, s_native_theme, ());
+  return &s_native_theme;
+}
+
+NativeThemeGtk2::NativeThemeGtk2()
+    : fake_window_(NULL),
+      fake_menu_item_(NULL) {
+}
+
+NativeThemeGtk2::~NativeThemeGtk2() {
+  if (fake_window_)
+    gtk_widget_destroy(fake_window_);
+  fake_entry_.Destroy();
+  fake_label_.Destroy();
+  fake_button_.Destroy();
+  fake_menu_.Destroy();
+}
+
+SkColor NativeThemeGtk2::GetSystemColor(ColorId color_id) const {
+  switch (color_id) {
+    // TODO(erg): Still need to fish the colors out of trees and tables.
+
+    // Tree
+    case kColorId_TreeBackground:
+      return kTreeBackground;
+    case kColorId_TreeText:
+      return kTreeTextColor;
+    case kColorId_TreeSelectedText:
+    case kColorId_TreeSelectedTextUnfocused:
+      return kTreeSelectedTextColor;
+    case kColorId_TreeSelectionBackgroundFocused:
+    case kColorId_TreeSelectionBackgroundUnfocused:
+      return kTreeSelectionBackgroundColor;
+    case kColorId_TreeArrow:
+      return kTreeArrowColor;
+
+    // Table
+    case kColorId_TableBackground:
+      return kTableBackground;
+    case kColorId_TableText:
+      return kTableTextColor;
+    case kColorId_TableSelectedText:
+    case kColorId_TableSelectedTextUnfocused:
+      return kTableSelectedTextColor;
+    case kColorId_TableSelectionBackgroundFocused:
+    case kColorId_TableSelectionBackgroundUnfocused:
+      return kTableSelectionBackgroundColor;
+    case kColorId_TableGroupingIndicatorColor:
+      return kTableGroupingIndicatorColor;
+
+    default:
+      // Fall through.
+      break;
+  }
+
+  return GdkColorToSkColor(GetSystemGdkColor(color_id));
+}
+
+void NativeThemeGtk2::PaintMenuPopupBackground(
+    SkCanvas* canvas,
+    const gfx::Size& size,
+    const MenuBackgroundExtraParams& menu_background) const {
+  if (menu_background.corner_radius > 0) {
+    SkPaint paint;
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setFlags(SkPaint::kAntiAlias_Flag);
+    paint.setColor(GetSystemColor(kColorId_MenuBackgroundColor));
+
+    gfx::Path path;
+    SkRect rect = SkRect::MakeWH(SkIntToScalar(size.width()),
+                                 SkIntToScalar(size.height()));
+    SkScalar radius = SkIntToScalar(menu_background.corner_radius);
+    SkScalar radii[8] = {radius, radius, radius, radius,
+                         radius, radius, radius, radius};
+    path.addRoundRect(rect, radii);
+
+    canvas->drawPath(path, paint);
+  } else {
+    canvas->drawColor(GetSystemColor(kColorId_MenuBackgroundColor),
+                      SkXfermode::kSrc_Mode);
+  }
+}
+
+GdkColor NativeThemeGtk2::GetSystemGdkColor(ColorId color_id) const {
+  switch (color_id) {
+    // Windows
+    case kColorId_WindowBackground:
+      return GetWindowStyle()->bg[GTK_STATE_NORMAL];
+
+    // Dialogs
+    case kColorId_DialogBackground:
+      return GetWindowStyle()->bg[GTK_STATE_NORMAL];
+
+    // FocusableBorder
+    case kColorId_FocusedBorderColor:
+      return GetEntryStyle()->bg[GTK_STATE_SELECTED];
+    case kColorId_UnfocusedBorderColor:
+      return GetEntryStyle()->text_aa[GTK_STATE_NORMAL];
+
+    // MenuItem
+    case kColorId_EnabledMenuItemForegroundColor:
+      return GetMenuItemStyle()->text[GTK_STATE_NORMAL];
+    case kColorId_DisabledMenuItemForegroundColor:
+      return GetMenuItemStyle()->text[GTK_STATE_INSENSITIVE];
+    // TODO(erg): We also need a FocusedMenuItemForegroundColor, since the
+    // accessibility theme HighContrastInverse is unreadable without it. That
+    // will require careful threading through existing menu code though.
+    case kColorId_FocusedMenuItemBackgroundColor:
+      return GetMenuItemStyle()->bg[GTK_STATE_SELECTED];
+    case kColorId_MenuBorderColor:
+    case kColorId_MenuSeparatorColor: {
+      return GetMenuItemStyle()->text[GTK_STATE_INSENSITIVE];
+    }
+    case kColorId_MenuBackgroundColor:
+      return GetMenuStyle()->bg[GTK_STATE_NORMAL];
+
+    // Label
+    case kColorId_LabelEnabledColor:
+      return GetLabelStyle()->text[GTK_STATE_NORMAL];
+    case kColorId_LabelDisabledColor:
+      return GetLabelStyle()->text[GTK_STATE_INSENSITIVE];
+    case kColorId_LabelBackgroundColor:
+      return GetWindowStyle()->bg[GTK_STATE_NORMAL];
+
+    // TextButton
+    case kColorId_TextButtonBackgroundColor:
+      return GetButtonStyle()->bg[GTK_STATE_NORMAL];
+    case kColorId_TextButtonEnabledColor:
+      return GetButtonStyle()->text[GTK_STATE_NORMAL];
+    case kColorId_TextButtonDisabledColor:
+      return GetButtonStyle()->text[GTK_STATE_INSENSITIVE];
+    case kColorId_TextButtonHighlightColor:
+      return GetButtonStyle()->base[GTK_STATE_SELECTED];
+    case kColorId_TextButtonHoverColor:
+      return GetButtonStyle()->text[GTK_STATE_NORMAL];
+
+    // Textfield
+    case kColorId_TextfieldDefaultColor:
+      return GetEntryStyle()->text[GTK_STATE_NORMAL];
+    case kColorId_TextfieldDefaultBackground:
+      return GetEntryStyle()->base[GTK_STATE_NORMAL];
+    case kColorId_TextfieldReadOnlyColor:
+      return GetEntryStyle()->text[GTK_STATE_INSENSITIVE];
+    case kColorId_TextfieldReadOnlyBackground:
+      return GetEntryStyle()->base[GTK_STATE_INSENSITIVE];
+    case kColorId_TextfieldSelectionColor:
+      return GetEntryStyle()->text[GTK_STATE_SELECTED];
+    case kColorId_TextfieldSelectionBackgroundFocused:
+      return GetEntryStyle()->base[GTK_STATE_SELECTED];
+    case kColorId_TextfieldSelectionBackgroundUnfocused:
+      return GetEntryStyle()->base[GTK_STATE_ACTIVE];
+
+    // Tree
+    // Table
+
+    default:
+      // Fall through
+      break;
+  }
+
+  return SkColorToGdkColor(kInvalidColorIdColor);
+}
+
+GtkWidget* NativeThemeGtk2::GetRealizedWindow() const {
+  if (!fake_window_) {
+    fake_window_ = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+    gtk_widget_realize(fake_window_);
+  }
+
+  return fake_window_;
+}
+
+GtkStyle* NativeThemeGtk2::GetWindowStyle() const {
+  return gtk_rc_get_style(GetRealizedWindow());
+}
+
+GtkStyle* NativeThemeGtk2::GetEntryStyle() const {
+  if (!fake_entry_.get()) {
+    fake_entry_.Own(gtk_entry_new());
+
+    // The fake entry needs to be in the window so it can be realized sow e can
+    // use the computed parts of the style.
+    gtk_container_add(GTK_CONTAINER(GetRealizedWindow()), fake_entry_.get());
+    gtk_widget_realize(fake_entry_.get());
+  }
+  return gtk_rc_get_style(fake_entry_.get());
+}
+
+GtkStyle* NativeThemeGtk2::GetLabelStyle() const {
+  if (!fake_label_.get())
+    fake_label_.Own(gtk_label_new(""));
+
+  return gtk_rc_get_style(fake_label_.get());
+}
+
+GtkStyle* NativeThemeGtk2::GetButtonStyle() const {
+  if (!fake_button_.get())
+    fake_button_.Own(gtk_button_new());
+
+  return gtk_rc_get_style(fake_button_.get());
+}
+
+GtkStyle* NativeThemeGtk2::GetMenuStyle() const {
+  if (!fake_menu_.get())
+    fake_menu_.Own(gtk_menu_new());
+  return gtk_rc_get_style(fake_menu_.get());
+}
+
+GtkStyle* NativeThemeGtk2::GetMenuItemStyle() const {
+  if (!fake_menu_item_) {
+    if (!fake_menu_.get())
+      fake_menu_.Own(gtk_menu_new());
+
+    fake_menu_item_ = gtk_menu_item_new();
+    gtk_menu_shell_append(GTK_MENU_SHELL(fake_menu_.get()), fake_menu_item_);
+  }
+
+  return gtk_rc_get_style(fake_menu_item_);
+}
+
+}  // namespace libgtk2ui