text: // Copyright 2019 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_PLATFORM_WINDOW_EXTENSIONS_X11_EXTENSION_H_
  #define UI_PLATFORM_WINDOW_EXTENSIONS_X11_EXTENSION_H_
  
  #include "base/component_export.h"
  #include "ui/gfx/geometry/rect.h"
  
  namespace ui {
  
  class PlatformWindow;
  class X11ExtensionDelegate;
  
  // Linux extensions that linux platforms can use to extend the platform windows
  // APIs. Please refer to README for more details.
  //
  // The extension mustn't be called until PlatformWindow is initialized.
  class COMPONENT_EXPORT(PLATFORM_WINDOW) X11Extension {
   public:
    // Returns whether an XSync extension is available at the current platform.
    virtual bool IsSyncExtensionAvailable() const = 0;
  
    // Returns a best-effort guess as to whether the WM is tiling (true) or
    // stacking (false).
    virtual bool IsWmTiling() const = 0;
  
    // Handles CompleteSwapAfterResize event coming from the compositor observer.
    virtual void OnCompleteSwapAfterResize() = 0;
  
    // Returns the current bounds in terms of the X11 Root Window including the
    // borders provided by the window manager (if any).
    virtual gfx::Rect GetXRootWindowOuterBounds() const = 0;
  
    // Says if the X11 Root Window contains the point within its set shape. If
    // shape is not set, returns true.
    virtual bool ContainsPointInXRegion(const gfx::Point& point) const = 0;
  
    // Asks X11 to lower the Xwindow down the stack so that it does not obscure
    // any sibling windows.
    virtual void LowerXWindow() = 0;
  
    // Forces this window to be unmanaged by the window manager if
    // |override_redirect| is true.
    virtual void SetOverrideRedirect(bool override_redirect) = 0;
  
    virtual void SetX11ExtensionDelegate(X11ExtensionDelegate* delegate) = 0;
  
   protected:
    virtual ~X11Extension();
  
    // Sets the pointer to the extension as a property of the PlatformWindow.
    void SetX11Extension(PlatformWindow* platform_window,
                         X11Extension* x11_extensions);
  };
  
  COMPONENT_EXPORT(PLATFORM_WINDOW)
  X11Extension* GetX11Extension(const PlatformWindow& platform_window);
  
  }  // namespace ui
  
  #endif  // UI_PLATFORM_WINDOW_EXTENSIONS_X11_EXTENSION_H_
  