Linux: Add support for custom cursor themes

chrome/browser/ui/libgtk2ui/gtk2_ui.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 "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
 
 #include <math.h>
 #include <pango/pango.h>
 #include <set>
 #include <utility>
+#include <X11/Xcursor/Xcursor.h>

[Lei Zhang, 2016/07/11 22:34:56]

nit: C headers above C++ headers.

[Tom (Use chromium acct), 2016/07/11 22:56:29]

Done.

 
 #include "base/command_line.h"
 #include "base/debug/leak_annotations.h"
 #include "base/environment.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/nix/mime_util_xdg.h"
 #include "base/nix/xdg_util.h"
 #include "base/stl_util.h"
@@ skipping 21 matching lines @@
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/display/display.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia_source.h"
 #include "ui/gfx/skbitmap_operations.h"
 #include "ui/gfx/skia_util.h"
+#include "ui/gfx/x/x11_types.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/views/controls/button/blue_button.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/button/label_button_border.h"
 #include "ui/views/linux_ui/window_button_order_observer.h"
 #include "ui/views/resources/grit/views_resources.h"
 
 #if defined(ENABLE_BASIC_PRINTING)
 #include "printing/printing_context_linux.h"
@@ skipping 439 matching lines @@
   GtkSettings* settings = gtk_settings_get_default();
   g_signal_connect_after(settings,
                          "notify::gtk-theme-name",
                          G_CALLBACK(OnThemeChanged),
                          this);
   g_signal_connect_after(settings,
                          "notify::gtk-icon-theme-name",
                          G_CALLBACK(OnThemeChanged),
                          this);
 
+  LoadGtkValues();
 
-  LoadGtkValues();
+  LoadCursorTheme();
 
 #if defined(ENABLE_BASIC_PRINTING)
   printing::PrintingContextLinux::SetCreatePrintDialogFunction(
       &PrintDialogGtk2::CreatePrintDialog);
   printing::PrintingContextLinux::SetPdfPaperSizeFunction(
       &GetPdfPaperSizeDeviceUnitsGtk);
 #endif
 
 #if defined(USE_GCONF)
   // We must build this after GTK gets initialized.
@@ skipping 466 matching lines @@
   inactive_selection_fg_color_ =
       theme->GetSystemColor(
           ui::NativeTheme::kColorId_TextfieldReadOnlyColor);
 
   colors_[ThemeProperties::COLOR_TAB_THROBBER_SPINNING] =
       theme->GetSystemColor(ui::NativeTheme::kColorId_ThrobberSpinningColor);
   colors_[ThemeProperties::COLOR_TAB_THROBBER_WAITING] =
       theme->GetSystemColor(ui::NativeTheme::kColorId_ThrobberWaitingColor);
 }
 
+void Gtk2UI::LoadCursorTheme() {
+  GtkSettings* settings = gtk_settings_get_default();
+
+  gchar* theme = nullptr;
+  gint size = 0;
+  g_object_get(settings,
+               "gtk-cursor-theme-name", &theme,
+               "gtk-cursor-theme-size", &size,
+               nullptr);
+  XcursorSetTheme(gfx::GetXDisplay(), theme);
+  XcursorSetDefaultSize(gfx::GetXDisplay(), size);
+}
+
 void Gtk2UI::UpdateMaterialDesignColors() {
   // TODO(varkha): This should be merged back into LoadGtkValues() once Material
   // Design is on unconditionally.
   // Early return when Material Design Controller is not initialized yet. This
   // is harmless and the colors will get updated when this method is called
   // again after the initialization. See http://crbug.com/622234.
   if (!ui::MaterialDesignController::is_mode_initialized() ||
       !ui::MaterialDesignController::IsModeMaterial()) {
     return;
   }
@@ skipping 402 matching lines @@
   // Blacklist scaling factors <130% (crbug.com/484400) and round
   // to 1 decimal to prevent rendering problems (crbug.com/485183).
   return scale < 1.3f ? 1.0f : roundf(scale * 10) / 10;
 }
 
 }  // namespace libgtk2ui
 
 views::LinuxUI* BuildGtk2UI() {
   return new libgtk2ui::Gtk2UI;
 }