Enable copying long text to Chrome and pasting long text from Chrome

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.cc

 // 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.
 
 #include "ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.h"
 
 #include <X11/Xatom.h>
 
 #include "base/event_types.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/dragdrop/drop_target_event.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_aurax11.h"
 #include "ui/base/x/selection_utils.h"
+#include "ui/base/x/x11_foreign_window_manager.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/events/event.h"
 #include "ui/events/platform/platform_event_source.h"
 #include "ui/views/widget/desktop_aura/desktop_native_cursor_manager.h"
 #include "ui/views/widget/desktop_aura/x11_topmost_window_finder.h"
 #include "ui/wm/public/drag_drop_client.h"
 #include "ui/wm/public/drag_drop_delegate.h"
 
 using aura::client::DragDropDelegate;
 using ui::OSExchangeData;
@@ skipping 105 matching lines @@
 
   // The atom cache owned by our parent.
   ui::X11AtomCache* atom_cache_;
 
   // The XID of our chrome local aura window handling our events.
   ::Window local_window_;
 
   // The XID of the window that's initiated the drag.
   unsigned long source_window_;
 
+  // The DesktopDragDropClientAuraX11 for |source_window_| if |source_window_|
+  // belongs to a Chrome window.
+  DesktopDragDropClientAuraX11* source_client_;
+
+  // Used to unselect PropertyChangeMask on |source_window_| if |source_window_|
+  // does not belong to a Chrome window when X11DragContext is destroyed.
+  int foreign_window_manager_source_window_id_;
+
   // The client we inform once we're done with requesting data.
   DesktopDragDropClientAuraX11* drag_drop_client_;
 
   // Whether we're blocking the handling of an XdndPosition message by waiting
   // for |unfetched_targets_| to be fetched.
   bool waiting_to_handle_position_;
 
   // Where the cursor is on screen.
   gfx::Point screen_point_;
 
@@ skipping 14 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(X11DragContext);
 };
 
 DesktopDragDropClientAuraX11::X11DragContext::X11DragContext(
     ui::X11AtomCache* atom_cache,
     ::Window local_window,
     const XClientMessageEvent& event)
     : atom_cache_(atom_cache),
       local_window_(local_window),
       source_window_(event.data.l[0]),
+      source_client_(
+          DesktopDragDropClientAuraX11::GetForWindow(source_window_)),
+      foreign_window_manager_source_window_id_(0),
       drag_drop_client_(NULL),
       waiting_to_handle_position_(false),
       suggested_action_(None) {
   bool get_types = ((event.data.l[1] & 1) != 0);
 
   if (get_types) {
     if (!ui::GetAtomArrayProperty(source_window_,
                                   "XdndTypeList",
                                   &unfetched_targets_)) {
       return;
     }
   } else {
     // data.l[2,3,4] contain the first three types. Unused slots can be None.
     for (int i = 0; i < 3; ++i) {
       if (event.data.l[2+i] != None) {
         unfetched_targets_.push_back(event.data.l[2+i]);
       }
     }
   }
 
-  DesktopDragDropClientAuraX11* client =
-      DesktopDragDropClientAuraX11::GetForWindow(source_window_);
-  if (!client) {
+  if (!source_client_) {
     // The window doesn't have a DesktopDragDropClientAuraX11, that means it's
     // created by some other process. Listen for messages on it.
     ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
-    XSelectInput(gfx::GetXDisplay(), source_window_, PropertyChangeMask);
+    foreign_window_manager_source_window_id_ =
+        ui::XForeignWindowManager::GetInstance()->RequestEvents(
+            source_window_, PropertyChangeMask);
 
     // We must perform a full sync here because we could be racing
     // |source_window_|.
     XSync(gfx::GetXDisplay(), False);
   } else {
     // This drag originates from an aura window within our process. This means
     // that we can shortcut the X11 server and ask the owning SelectionOwner
     // for the data it's offering.
-    fetched_targets_ = client->GetFormatMap();
+    fetched_targets_ = source_client_->GetFormatMap();
     unfetched_targets_.clear();
   }
 
   ReadActions();
 }
 
 DesktopDragDropClientAuraX11::X11DragContext::~X11DragContext() {
-  // Unsubscribe from message events.
-  ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
+  if (!source_client_) {
+    // Unsubscribe from message events.
+    ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
+    ui::XForeignWindowManager::GetInstance()->CancelRequest(
+        foreign_window_manager_source_window_id_);
+  }
 }
 
 void DesktopDragDropClientAuraX11::X11DragContext::OnStartXdndPositionMessage(
     DesktopDragDropClientAuraX11* client,
     ::Atom suggested_action,
     ::Window source_window,
     const gfx::Point& screen_point) {
   DCHECK_EQ(source_window_, source_window);
   suggested_action_ = suggested_action;
 
@@ skipping 43 matching lines @@
   if (!unfetched_targets_.empty()) {
     RequestNextTarget();
   } else {
     waiting_to_handle_position_ = false;
     drag_drop_client_->CompleteXdndPosition(source_window_, screen_point_);
     drag_drop_client_ = NULL;
   }
 }
 
 void DesktopDragDropClientAuraX11::X11DragContext::ReadActions() {
-  DesktopDragDropClientAuraX11* client =
-      DesktopDragDropClientAuraX11::GetForWindow(source_window_);
-  if (!client) {
+  if (!source_client_) {
     std::vector<Atom> atom_array;
     if (!ui::GetAtomArrayProperty(source_window_,
                                   "XdndActionList",
                                   &atom_array)) {
       actions_.clear();
     } else {
       actions_.swap(atom_array);
     }
   } else {
     // We have a property notify set up for other windows in case they change
     // their action list. Thankfully, the views interface is static and you
     // can't change the action list after you enter StartDragAndDrop().
-    actions_ = client->GetOfferedDragOperations();
+    actions_ = source_client_->GetOfferedDragOperations();
   }
 }
 
 int DesktopDragDropClientAuraX11::X11DragContext::GetDragOperation() const {
   int drag_operation = ui::DragDropTypes::DRAG_NONE;
   for (std::vector<Atom>::const_iterator it = actions_.begin();
        it != actions_.end(); ++it) {
     MaskOperation(*it, &drag_operation);
   }
 
@@ skipping 713 matching lines @@
   xev.xclient.window = dest_window;
   xev.xclient.data.l[0] = xwindow_;
   xev.xclient.data.l[1] = 0;
   xev.xclient.data.l[2] = CurrentTime;
   xev.xclient.data.l[3] = None;
   xev.xclient.data.l[4] = None;
   SendXClientEvent(dest_window, &xev);
 }
 
 }  // namespace views