1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_BASE_X_SELECTION_OWNER_H_ 6 #define UI_BASE_X_SELECTION_OWNER_H_ 7 8 #include <X11/Xlib.h> 9 10 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class. 11 #undef RootWindow 12 13 #include <vector> 14 15 #include "base/basictypes.h" 16 #include "base/callback.h" 17 #include "ui/base/ui_base_export.h" 18 #include "ui/base/x/selection_utils.h" 19 #include "ui/gfx/x/x11_atom_cache.h" 20 21 namespace ui { 22 23 // Owns a specific X11 selection on an X window. 24 // 25 // The selection owner object keeps track of which xwindow is the current 26 // owner, and when its |xwindow_|, offers different data types to other 27 // processes. 28 class UI_BASE_EXPORT SelectionOwner { 29 public: 30 SelectionOwner(Display* xdisplay, 31 ::Window xwindow, 32 ::Atom selection_name); 33 ~SelectionOwner(); 34 35 // Returns the current selection data. Useful for fast paths. 36 const SelectionFormatMap& selection_format_map() { return format_map_; } 37 38 // Appends a list of types we're offering to |targets|. 39 void RetrieveTargets(std::vector<Atom>* targets); 40 41 // Attempts to take ownership of the selection. If we're successful, present 42 // |data| to other windows. 43 void TakeOwnershipOfSelection(const SelectionFormatMap& data); 44 45 // Clears our internal format map and clears the selection owner, whether we 46 // own the selection or not. 47 void ClearSelectionOwner(); 48 49 // It is our owner's responsibility to plumb X11 events on |xwindow_| to us. 50 void OnSelectionRequest(const XSelectionRequestEvent& event); 51 void OnSelectionClear(const XSelectionClearEvent& event); 52 // TODO(erg): Do we also need to follow PropertyNotify events? We currently 53 // don't, but there were open todos in the previous implementation. 54 55 private: 56 // Attempts to convert the selection to |target|. If the conversion is 57 // successful, true is returned and the result is stored in the |property| 58 // of |requestor|. 59 bool ProcessTarget(::Atom target, ::Window requestor, ::Atom property); 60 61 // Our X11 state. 62 Display* x_display_; 63 ::Window x_window_; 64 65 // The X11 selection that this instance communicates on. 66 ::Atom selection_name_; 67 68 // The data we are currently serving. 69 SelectionFormatMap format_map_; 70 71 X11AtomCache atom_cache_; 72 73 DISALLOW_COPY_AND_ASSIGN(SelectionOwner); 74 }; 75 76 } // namespace ui 77 78 #endif // UI_BASE_X_SELECTION_OWNER_H_ 79
