ui/base/dragdrop/os_exchange_data_provider_aurax11.h

   1 // Copyright (c) 2012 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_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURAX11_H_
   6 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURAX11_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 <map>
  14
  15 #include "base/files/file_path.h"
  16 #include "base/message_loop/message_pump_dispatcher.h"
  17 #include "base/pickle.h"
  18 #include "ui/base/dragdrop/os_exchange_data.h"
  19 #include "ui/base/x/selection_owner.h"
  20 #include "ui/base/x/selection_requestor.h"
  21 #include "ui/base/x/selection_utils.h"
  22 #include "ui/gfx/image/image_skia.h"
  23 #include "ui/gfx/vector2d.h"
  24 #include "ui/gfx/x/x11_atom_cache.h"
  25 #include "url/gurl.h"
  26
  27 namespace ui {
  28
  29 class Clipboard;
  30 class OSExchangeDataProviderAuraX11Test;
  31
  32 // OSExchangeData::Provider implementation for aura on linux.
  33 class UI_BASE_EXPORT OSExchangeDataProviderAuraX11
  34     : public OSExchangeData::Provider,
  35       public base::MessagePumpDispatcher {
  36  public:
  37   // |x_window| is the window the cursor is over, and |selection| is the set of
  38   // data being offered.
  39   OSExchangeDataProviderAuraX11(::Window x_window,
  40                                 const SelectionFormatMap& selection);
  41
  42   // Creates a Provider for sending drag information. This creates its own,
  43   // hidden X11 window to own send data.
  44   OSExchangeDataProviderAuraX11();
  45
  46   virtual ~OSExchangeDataProviderAuraX11();
  47
  48   // After all the Set* methods have built up the data we're offering, call
  49   // this to take ownership of the XdndSelection clipboard.
  50   void TakeOwnershipOfSelection() const;
  51
  52   // Retrieves a list of types we're offering. Noop if we haven't taken the
  53   // selection.
  54   void RetrieveTargets(std::vector<Atom>* targets) const;
  55
  56   // Makes a copy of the format map currently being offered.
  57   SelectionFormatMap GetFormatMap() const;
  58
  59   // Overridden from OSExchangeData::Provider:
  60   virtual Provider* Clone() const OVERRIDE;
  61   virtual void SetString(const base::string16& data) OVERRIDE;
  62   virtual void SetURL(const GURL& url, const base::string16& title) OVERRIDE;
  63   virtual void SetFilename(const base::FilePath& path) OVERRIDE;
  64   virtual void SetFilenames(
  65       const std::vector<OSExchangeData::FileInfo>& filenames) OVERRIDE;
  66   virtual void SetPickledData(const OSExchangeData::CustomFormat& format,
  67                               const Pickle& pickle) OVERRIDE;
  68   virtual bool GetString(base::string16* data) const OVERRIDE;
  69   virtual bool GetURLAndTitle(GURL* url, base::string16* title) const OVERRIDE;
  70   virtual bool GetFilename(base::FilePath* path) const OVERRIDE;
  71   virtual bool GetFilenames(
  72       std::vector<OSExchangeData::FileInfo>* filenames) const OVERRIDE;
  73   virtual bool GetPickledData(const OSExchangeData::CustomFormat& format,
  74                               Pickle* pickle) const OVERRIDE;
  75   virtual bool HasString() const OVERRIDE;
  76   virtual bool HasURL() const OVERRIDE;
  77   virtual bool HasFile() const OVERRIDE;
  78   virtual bool HasCustomFormat(const OSExchangeData::CustomFormat& format) const
  79       OVERRIDE;
  80
  81   virtual void SetHtml(const base::string16& html,
  82                        const GURL& base_url) OVERRIDE;
  83   virtual bool GetHtml(base::string16* html, GURL* base_url) const OVERRIDE;
  84   virtual bool HasHtml() const OVERRIDE;
  85   virtual void SetDragImage(const gfx::ImageSkia& image,
  86                             const gfx::Vector2d& cursor_offset) OVERRIDE;
  87   virtual const gfx::ImageSkia& GetDragImage() const OVERRIDE;
  88   virtual const gfx::Vector2d& GetDragImageOffset() const OVERRIDE;
  89
  90   // Overridden from base::MessagePumpDispatcher:
  91   virtual bool Dispatch(const base::NativeEvent& event) OVERRIDE;
  92
  93  private:
  94   friend class OSExchangeDataProviderAuraX11Test;
  95   typedef std::map<OSExchangeData::CustomFormat, Pickle>  PickleData;
  96
  97   // Returns true if |formats_| contains a string format and the string can be
  98   // parsed as a URL.
  99   bool GetPlainTextURL(GURL* url) const;
 100
 101   // Returns the targets in |format_map_|.
 102   std::vector< ::Atom> GetTargets() const;
 103
 104   // Drag image and offset data.
 105   gfx::ImageSkia drag_image_;
 106   gfx::Vector2d drag_image_offset_;
 107
 108   // Our X11 state.
 109   Display* x_display_;
 110   ::Window x_root_window_;
 111
 112   // In X11, because the IPC parts of drag operations are implemented by
 113   // XSelection, we require an x11 window to receive drag messages on. The
 114   // OSExchangeDataProvider system is modeled on the Windows implementation,
 115   // which does not require a window. We only sometimes have a valid window
 116   // available (in the case of drag receiving). Other times, we need to create
 117   // our own xwindow just to receive events on it.
 118   const bool own_window_;
 119
 120   ::Window x_window_;
 121
 122   X11AtomCache atom_cache_;
 123
 124   // A representation of data. This is either passed to us from the other
 125   // process, or built up through a sequence of Set*() calls. It can be passed
 126   // to |selection_owner_| when we take the selection.
 127   SelectionFormatMap format_map_;
 128
 129   // Takes a snapshot of |format_map_| and offers it to other windows.
 130   mutable SelectionOwner selection_owner_;
 131
 132   DISALLOW_COPY_AND_ASSIGN(OSExchangeDataProviderAuraX11);
 133 };
 134
 135 }  // namespace ui
 136
 137 #endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_AURAX11_H_