src/ui/views/widget/desktop_aura/x11_desktop_handler.cc

   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 #include "ui/views/widget/desktop_aura/x11_desktop_handler.h"
   6
   7 #include "base/message_loop/message_loop.h"
   8 #include "ui/aura/env.h"
   9 #include "ui/aura/root_window.h"
  10 #include "ui/base/x/x11_util.h"
  11
  12 #if !defined(OS_CHROMEOS)
  13 #include "ui/views/ime/input_method.h"
  14 #include "ui/views/widget/desktop_aura/desktop_root_window_host_x11.h"
  15 #endif
  16
  17 namespace {
  18
  19 const char* kAtomsToCache[] = {
  20   "_NET_ACTIVE_WINDOW",
  21   NULL
  22 };
  23
  24 // Our global instance. Deleted when our Env() is deleted.
  25 views::X11DesktopHandler* g_handler = NULL;
  26
  27 }  // namespace
  28
  29 namespace views {
  30
  31 // static
  32 X11DesktopHandler* X11DesktopHandler::get() {
  33   if (!g_handler)
  34     g_handler = new X11DesktopHandler;
  35
  36   return g_handler;
  37 }
  38
  39 X11DesktopHandler::X11DesktopHandler()
  40     : xdisplay_(gfx::GetXDisplay()),
  41       x_root_window_(DefaultRootWindow(xdisplay_)),
  42       current_window_(None),
  43       atom_cache_(xdisplay_, kAtomsToCache) {
  44   base::MessagePumpX11::Current()->AddDispatcherForRootWindow(this);
  45   aura::Env::GetInstance()->AddObserver(this);
  46
  47   XWindowAttributes attr;
  48   XGetWindowAttributes(xdisplay_, x_root_window_, &attr);
  49   XSelectInput(xdisplay_, x_root_window_,
  50                attr.your_event_mask | PropertyChangeMask |
  51                StructureNotifyMask | SubstructureNotifyMask);
  52 }
  53
  54 X11DesktopHandler::~X11DesktopHandler() {
  55   aura::Env::GetInstance()->RemoveObserver(this);
  56   base::MessagePumpX11::Current()->RemoveDispatcherForRootWindow(this);
  57 }
  58
  59 void X11DesktopHandler::ActivateWindow(::Window window) {
  60   DCHECK_EQ(gfx::GetXDisplay(), xdisplay_);
  61
  62   XEvent xclient;
  63   memset(&xclient, 0, sizeof(xclient));
  64   xclient.type = ClientMessage;
  65   xclient.xclient.window = window;
  66   xclient.xclient.message_type = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
  67   xclient.xclient.format = 32;
  68   xclient.xclient.data.l[0] = 1;  // Specified we are an app.
  69   xclient.xclient.data.l[1] = CurrentTime;
  70   xclient.xclient.data.l[2] = None;
  71   xclient.xclient.data.l[3] = 0;
  72   xclient.xclient.data.l[4] = 0;
  73
  74   XSendEvent(xdisplay_, x_root_window_, False,
  75              SubstructureRedirectMask | SubstructureNotifyMask,
  76              &xclient);
  77 }
  78
  79 bool X11DesktopHandler::IsActiveWindow(::Window window) const {
  80   return window == current_window_;
  81 }
  82
  83 bool X11DesktopHandler::Dispatch(const base::NativeEvent& event) {
  84   // Check for a change to the active window.
  85   switch (event->type) {
  86     case PropertyNotify: {
  87       ::Atom active_window = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
  88
  89       if (event->xproperty.window == x_root_window_ &&
  90           event->xproperty.atom == active_window) {
  91         int window;
  92         if (ui::GetIntProperty(x_root_window_, "_NET_ACTIVE_WINDOW", &window) &&
  93             window) {
  94           OnActiveWindowChanged(static_cast< ::Window>(window));
  95         }
  96       }
  97       break;
  98     }
  99   }
 100
 101   return true;
 102 }
 103
 104 void X11DesktopHandler::OnWindowInitialized(aura::Window* window) {
 105 }
 106
 107 void X11DesktopHandler::OnWillDestroyEnv() {
 108   g_handler = NULL;
 109   delete this;
 110 }
 111
 112 void X11DesktopHandler::OnActiveWindowChanged(::Window xid) {
 113   DesktopRootWindowHostX11* old_host =
 114       views::DesktopRootWindowHostX11::GetHostForXID(current_window_);
 115   if (old_host)
 116     old_host->HandleNativeWidgetActivationChanged(false);
 117
 118   DesktopRootWindowHostX11* new_host =
 119       views::DesktopRootWindowHostX11::GetHostForXID(xid);
 120   if (new_host)
 121     new_host->HandleNativeWidgetActivationChanged(true);
 122
 123   current_window_ = xid;
 124 }
 125
 126 }  // namespace views