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// 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.
#ifndef UI_GTK_GTK_UTIL_H_
#define UI_GTK_GTK_UTIL_H_
#include <gtk/gtk.h>
#include <string>
#include "ui/base/glib/scoped_gobject.h"
#include "ui/native_theme/native_theme.h"
#include "ui/views/window/frame_buttons.h"
// Function availability can be tested by checking if the address of gtk_* is
// not nullptr.
#define WEAK_GTK_FN(x) extern "C" __attribute__((weak)) decltype(x) x
typedef union _GdkEvent GdkEvent;
namespace aura {
class Window;
namespace base {
class CommandLine;
namespace color_utils {
struct HSL;
namespace ui {
class KeyEvent;
namespace gtk {
extern const color_utils::HSL kDefaultTintFrameIncognito;
void GtkInitFromCommandLine(const base::CommandLine& command_line);
// Sets |dialog| as transient for |parent|, which will keep it on top and center
// it above |parent|. Do nothing if |parent| is nullptr.
void SetGtkTransientForAura(GtkWidget* dialog, aura::Window* parent);
// Gets the transient parent aura window for |dialog|.
aura::Window* GetAuraTransientParent(GtkWidget* dialog);
// Clears the transient parent for |dialog|.
void ClearAuraTransientParent(GtkWidget* dialog, aura::Window* parent);
// Parses |button_string| into |leading_buttons| and
// |trailing_buttons|. The string is of the format
// "<button>*:<button*>", for example, "close:minimize:maximize".
// This format is used by GTK settings and gsettings.
void ParseButtonLayout(const std::string& button_string,
std::vector<views::FrameButton>* leading_buttons,
std::vector<views::FrameButton>* trailing_buttons);
class CairoSurface {
// Attaches a cairo surface to an SkBitmap so that GTK can render
// into it. |bitmap| must outlive this CairoSurface.
explicit CairoSurface(SkBitmap& bitmap);
// Creates a new cairo surface with the given size. The memory for
// this surface is deallocated when this CairoSurface is destroyed.
explicit CairoSurface(const gfx::Size& size);
// Get the drawing context for GTK to use.
cairo_t* cairo() { return cairo_; }
// Returns the average of all pixels in the surface. If |frame| is
// true, the resulting alpha will be the average alpha, otherwise it
// will be the max alpha across all pixels.
SkColor GetAveragePixelValue(bool frame);
cairo_surface_t* surface_;
cairo_t* cairo_;
// Returns true iff the runtime version of Gtk used meets
// |major|.|minor|.|micro|.
bool GtkCheckVersion(int major, int minor = 0, int micro = 0);
using ScopedStyleContext = ScopedGObject<GtkStyleContext>;
using ScopedCssProvider = ScopedGObject<GtkCssProvider>;
} // namespace gtk
// Template override cannot be in the gtk namespace.
template <>
inline void gtk::ScopedStyleContext::Unref() {
// Versions of GTK earlier than 3.15.4 had a bug where a g_assert
// would be triggered when trying to free a GtkStyleContext that had
// a parent whose only reference was the child context in question.
// This is a hack to work around that case. See GTK commit
// "gtkstylecontext: Don't try to emit a signal when finalizing".
GtkStyleContext* context = obj_;
while (context) {
GtkStyleContext* parent = gtk_style_context_get_parent(context);
if (parent && G_OBJECT(context)->ref_count == 1 &&
!gtk::GtkCheckVersion(3, 15, 4)) {
gtk_style_context_set_parent(context, nullptr);
} else {
context = parent;
namespace gtk {
// Converts ui::NativeTheme::State to GtkStateFlags.
GtkStateFlags StateToStateFlags(ui::NativeTheme::State state);
SkColor GdkRgbaToSkColor(const GdkRGBA& color);
// If |context| is nullptr, creates a new top-level style context
// specified by parsing |css_node|. Otherwise, creates the child
// context with |context| as the parent.
ScopedStyleContext AppendCssNodeToStyleContext(GtkStyleContext* context,
const std::string& css_node);
// Parses |css_selector| into a GtkStyleContext. The format is a
// sequence of whitespace-separated objects. Each object may have at
// most one object name at the beginning of the string, and any number
// of '.'-prefixed classes and ':'-prefixed pseudoclasses. An example
// is "GtkButton.button.suggested-action:hover:active". The caller
// must g_object_unref() the returned context.
ScopedStyleContext GetStyleContextFromCss(const std::string& css_selector);
SkColor GetFgColorFromStyleContext(GtkStyleContext* context);
SkColor GetBgColorFromStyleContext(GtkStyleContext* context);
// Overrides properties on |context| and all its parents with those
// provided by |css|.
void ApplyCssToContext(GtkStyleContext* context, const std::string& css);
// Get the 'color' property from the style context created by
// GetStyleContextFromCss(|css_selector|).
SkColor GetFgColor(const std::string& css_selector);
ScopedCssProvider GetCssProvider(const std::string& css);
// Renders the backgrounds of all ancestors of |context|, then renders
// the background for |context| itself.
void RenderBackground(const gfx::Size& size,
cairo_t* cr,
GtkStyleContext* context);
// Renders a background from the style context created by
// GetStyleContextFromCss(|css_selector|) into a 24x24 bitmap and
// returns the average color.
SkColor GetBgColor(const std::string& css_selector);
// Renders the border from the style context created by
// GetStyleContextFromCss(|css_selector|) into a 24x24 bitmap and
// returns the average color.
SkColor GetBorderColor(const std::string& css_selector);
// On Gtk3.20 or later, behaves like GetBgColor. Otherwise, returns
// the background-color property.
SkColor GetSelectionBgColor(const std::string& css_selector);
// Get the color of the GtkSeparator specified by |css_selector|.
SkColor GetSeparatorColor(const std::string& css_selector);
// Get a GtkSettings property as a C++ string.
std::string GetGtkSettingsStringProperty(GtkSettings* settings,
const gchar* prop_name);
// Xkb Events store group attribute into XKeyEvent::state bit field, along with
// other state-related info, while GdkEventKey objects have separate fields for
// that purpose, they are ::state and ::group. This function is responsible for
// recomposing them into a single bit field value when translating GdkEventKey
// into XKeyEvent. This is similar to XkbBuildCoreState(), but assumes state is
// an uint rather than an uchar.
// More details:
int BuildXkbStateFromGdkEvent(unsigned int state, unsigned char group);
// Translates |key_event| into a GdkEvent. GdkEvent::key::window is the only
// field not set by this function, callers must set it, as the way for
// retrieving it may vary depending on the event being processed. E.g: for IME
// Context impl, X11 window XID is obtained through Event::target() which is
// root aura::Window targeted by that key event.
GdkEvent* GdkEventFromKeyEvent(const ui::KeyEvent& key_event);
} // namespace gtk
#endif // UI_GTK_GTK_UTIL_H_