Delete the GTK+ port of Chrome.

ui/gfx/gtk_native_view_id_manager.h

-// 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_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_
-#define UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_
-
-#include <map>
-
-#include "base/synchronization/lock.h"
-#include "ui/gfx/gfx_export.h"
-#include "ui/gfx/native_widget_types.h"
-
-template <typename T> struct DefaultSingletonTraits;
-
-typedef unsigned long XID;
-struct _GtkPreserveWindow;
-
-// NativeViewIds are the opaque values which the renderer holds as a reference
-// to a window.
-//
-// We could make NativeViewIds be the X id of the window. However, at the
-// time when we need to tell the renderer about its NativeViewId, an XID isn't
-// availible and it goes very much against the grain of the code to make it so.
-// Also, we worry that GTK might choose to change the underlying X window id
-// when, say, the widget is hidden or repacked. Finally, if we used XIDs then a
-// compromised renderer could start asking questions about any X windows on the
-// system.
-//
-// Thus, we have this object. It produces random NativeViewIds from GtkWidget
-// pointers and observes the various signals from the widget for when an X
-// window is created, destroyed etc. Thus it provides a thread safe mapping
-// from NativeViewIds to the current XID for that widget.
-class GFX_EXPORT GtkNativeViewManager {
- public:
-  // Returns the singleton instance.
-  static GtkNativeViewManager* GetInstance();
-
-  // Must be called from the UI thread:
-  //
-  // Return a NativeViewId for the given widget and attach to the various
-  // signals emitted by that widget. The NativeViewId is pseudo-randomly
-  // allocated so that a compromised renderer trying to guess values will fail
-  // with high probability. The NativeViewId will not be reused for the
-  // lifetime of the GtkWidget.
-  gfx::NativeViewId GetIdForWidget(gfx::NativeView widget);
-
-  // May be called from any thread:
-  //
-  // xid: (output) the resulting X window ID, or 0
-  // id: a value previously returned from GetIdForWidget
-  // returns: true if |id| is a valid id, false otherwise.
-  //
-  // If the widget referenced by |id| does not current have an X window id,
-  // |*xid| is set to 0.
-  bool GetXIDForId(XID* xid, gfx::NativeViewId id);
-
-  // May be called from the UI thread:
-  //
-  // Same as GetXIDForId except it returns the NativeView (GtkWidget*).
-  bool GetNativeViewForId(gfx::NativeView* xid, gfx::NativeViewId id);
-
-  // Must be called from the UI thread because we may need the associated
-  // widget to create a window.
-  //
-  // Keeping the XID permanent requires a bit of overhead, so it must
-  // be explicitly requested.
-  //
-  // xid: (output) the resulting X window
-  // id: a value previously returned from GetIdForWidget
-  // returns: true if |id| is a valid id, false otherwise.
-  bool GetPermanentXIDForId(XID* xid, gfx::NativeViewId id);
-
-  // Can be called from any thread.
-  // Will return false if the given XID isn't permanent or has already been
-  // released.
-  bool AddRefPermanentXID(XID xid);
-
-  // Must be called from the UI thread because we may need to access a
-  // GtkWidget or destroy a GdkWindow.
-  //
-  // If the widget associated with the XID is still alive, allow the widget
-  // to destroy the associated XID when it wants. Otherwise, destroy the
-  // GdkWindow associated with the XID.
-  void ReleasePermanentXID(XID xid);
-
-  // These are actually private functions, but need to be called from statics.
-  void OnRealize(gfx::NativeView widget);
-  void OnUnrealize(gfx::NativeView widget);
-  void OnDestroy(gfx::NativeView widget);
-
- private:
-  // This object is a singleton:
-  GtkNativeViewManager();
-  ~GtkNativeViewManager();
-  friend struct DefaultSingletonTraits<GtkNativeViewManager>;
-
-  struct NativeViewInfo {
-    NativeViewInfo() : widget(NULL), x_window_id(0) {
-    }
-    gfx::NativeView widget;
-    XID x_window_id;
-  };
-
-  gfx::NativeViewId GetWidgetId(gfx::NativeView id);
-
-  // protects native_view_to_id_ and id_to_info_
-  base::Lock lock_;
-
-  // If asked for an id for the same widget twice, we want to return the same
-  // id. So this records the current mapping.
-  std::map<gfx::NativeView, gfx::NativeViewId> native_view_to_id_;
-  std::map<gfx::NativeViewId, NativeViewInfo> id_to_info_;
-
-  struct PermanentXIDInfo {
-    PermanentXIDInfo() : widget(NULL), ref_count(0) {
-    }
-    _GtkPreserveWindow* widget;
-    int ref_count;
-  };
-
-  // Used to maintain the reference count for permanent XIDs
-  // (referenced by GetPermanentXIDForId and dereferenced by
-  // ReleasePermanentXID). Only those XIDs with a positive reference count
-  // will be in the table.
-  //
-  // In general, several GTK widgets may share the same X window. We assume
-  // that is not true of the widgets stored in this registry.
-  //
-  // An XID will map to NULL, if there is an outstanding reference but the
-  // widget was destroyed. In this case, the destruction of the X window
-  // is deferred to the dropping of all references.
-  std::map<XID, PermanentXIDInfo> perm_xid_to_info_;
-
-  DISALLOW_COPY_AND_ASSIGN(GtkNativeViewManager);
-};
-
-#endif  // UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_