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 <X11/Xatom.h>
   8 #include <X11/Xlib.h>
   9
  10 #include "base/message_loop/message_loop.h"
  11 #include "ui/aura/env.h"
  12 #include "ui/aura/window_event_dispatcher.h"
  13 #include "ui/base/x/x11_foreign_window_manager.h"
  14 #include "ui/base/x/x11_menu_list.h"
  15 #include "ui/base/x/x11_util.h"
  16 #include "ui/events/platform/platform_event_source.h"
  17 #include "ui/gfx/x/x11_error_tracker.h"
  18 #include "ui/views/ime/input_method.h"
  19 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
  20
  21 namespace {
  22
  23 const char* kAtomsToCache[] = {
  24   "_NET_ACTIVE_WINDOW",
  25   NULL
  26 };
  27
  28 // Our global instance. Deleted when our Env() is deleted.
  29 views::X11DesktopHandler* g_handler = NULL;
  30
  31 }  // namespace
  32
  33 namespace views {
  34
  35 // static
  36 X11DesktopHandler* X11DesktopHandler::get() {
  37   if (!g_handler)
  38     g_handler = new X11DesktopHandler;
  39
  40   return g_handler;
  41 }
  42
  43 X11DesktopHandler::X11DesktopHandler()
  44     : xdisplay_(gfx::GetXDisplay()),
  45       x_root_window_(DefaultRootWindow(xdisplay_)),
  46       wm_user_time_ms_(0),
  47       current_window_(None),
  48       current_window_active_state_(NOT_ACTIVE),
  49       atom_cache_(xdisplay_, kAtomsToCache),
  50       wm_supports_active_window_(false) {
  51   if (ui::PlatformEventSource::GetInstance())
  52     ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
  53   aura::Env::GetInstance()->AddObserver(this);
  54
  55   XWindowAttributes attr;
  56   XGetWindowAttributes(xdisplay_, x_root_window_, &attr);
  57   XSelectInput(xdisplay_, x_root_window_,
  58                attr.your_event_mask | PropertyChangeMask |
  59                StructureNotifyMask | SubstructureNotifyMask);
  60
  61   if (ui::GuessWindowManager() == ui::WM_WMII) {
  62     // wmii says that it supports _NET_ACTIVE_WINDOW but does not.
  63     // https://code.google.com/p/wmii/issues/detail?id=266
  64     wm_supports_active_window_ = false;
  65   } else {
  66     wm_supports_active_window_ =
  67         ui::WmSupportsHint(atom_cache_.GetAtom("_NET_ACTIVE_WINDOW"));
  68   }
  69 }
  70
  71 X11DesktopHandler::~X11DesktopHandler() {
  72   aura::Env::GetInstance()->RemoveObserver(this);
  73   if (ui::PlatformEventSource::GetInstance())
  74     ui::PlatformEventSource::GetInstance()->RemovePlatformEventDispatcher(this);
  75 }
  76
  77 void X11DesktopHandler::ActivateWindow(::Window window) {
  78   if (current_window_ == window &&
  79       current_window_active_state_ == NOT_ACTIVE) {
  80     // |window| is most likely still active wrt to the X server. Undo the
  81     // changes made in DeactivateWindow().
  82     OnActiveWindowChanged(window, ACTIVE);
  83
  84     // Go through the regular activation path such that calling
  85     // DeactivateWindow() and ActivateWindow() immediately afterwards results
  86     // in an active X window.
  87   }
  88
  89   XRaiseWindow(xdisplay_, window);
  90
  91   if (wm_supports_active_window_) {
  92     DCHECK_EQ(gfx::GetXDisplay(), xdisplay_);
  93
  94     XEvent xclient;
  95     memset(&xclient, 0, sizeof(xclient));
  96     xclient.type = ClientMessage;
  97     xclient.xclient.window = window;
  98     xclient.xclient.message_type = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
  99     xclient.xclient.format = 32;
 100     xclient.xclient.data.l[0] = 1;  // Specified we are an app.
 101     xclient.xclient.data.l[1] = wm_user_time_ms_;
 102     xclient.xclient.data.l[2] = None;
 103     xclient.xclient.data.l[3] = 0;
 104     xclient.xclient.data.l[4] = 0;
 105
 106     XSendEvent(xdisplay_, x_root_window_, False,
 107                SubstructureRedirectMask | SubstructureNotifyMask,
 108                &xclient);
 109   } else {
 110     // XRaiseWindow will not give input focus to the window. We now need to ask
 111     // the X server to do that. Note that the call will raise an X error if the
 112     // window is not mapped.
 113     XSetInputFocus(xdisplay_, window, RevertToParent, CurrentTime);
 114
 115     OnActiveWindowChanged(window, ACTIVE);
 116   }
 117 }
 118
 119 void X11DesktopHandler::DeactivateWindow(::Window window) {
 120   if (!IsActiveWindow(window))
 121     return;
 122
 123   XLowerWindow(xdisplay_, window);
 124
 125   // Per ICCCM: http://tronche.com/gui/x/icccm/sec-4.html#s-4.1.7
 126   // "Clients should not give up the input focus of their own volition.
 127   // They should ignore input that they receive instead."
 128   //
 129   // There is nothing else that we can do. Pretend that we have been
 130   // deactivated and ignore keyboard input in DesktopWindowTreeHostX11.
 131   OnActiveWindowChanged(window, NOT_ACTIVE);
 132 }
 133
 134 bool X11DesktopHandler::IsActiveWindow(::Window window) const {
 135   return window == current_window_ && current_window_active_state_ == ACTIVE;
 136 }
 137
 138 void X11DesktopHandler::ProcessXEvent(XEvent* event) {
 139   switch (event->type) {
 140     case FocusIn:
 141       if (current_window_ != event->xfocus.window)
 142         OnActiveWindowChanged(event->xfocus.window, ACTIVE);
 143       break;
 144     case FocusOut:
 145       if (current_window_ == event->xfocus.window)
 146         OnActiveWindowChanged(None, NOT_ACTIVE);
 147       break;
 148     default:
 149       NOTREACHED();
 150   }
 151 }
 152
 153 bool X11DesktopHandler::CanDispatchEvent(const ui::PlatformEvent& event) {
 154   return event->type == CreateNotify || event->type == DestroyNotify ||
 155          (event->type == PropertyNotify &&
 156           event->xproperty.window == x_root_window_);
 157 }
 158
 159 uint32_t X11DesktopHandler::DispatchEvent(const ui::PlatformEvent& event) {
 160   switch (event->type) {
 161     case PropertyNotify: {
 162       // Check for a change to the active window.
 163       CHECK_EQ(x_root_window_, event->xproperty.window);
 164       ::Atom active_window_atom = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
 165       if (event->xproperty.atom == active_window_atom) {
 166         ::Window window;
 167         if (ui::GetXIDProperty(x_root_window_, "_NET_ACTIVE_WINDOW", &window) &&
 168             window) {
 169           OnActiveWindowChanged(window, ACTIVE);
 170         }
 171       }
 172       break;
 173     }
 174
 175     case CreateNotify:
 176       OnWindowCreatedOrDestroyed(event->type, event->xcreatewindow.window);
 177       break;
 178     case DestroyNotify:
 179       OnWindowCreatedOrDestroyed(event->type, event->xdestroywindow.window);
 180       break;
 181     default:
 182       NOTREACHED();
 183   }
 184
 185   return ui::POST_DISPATCH_NONE;
 186 }
 187
 188 void X11DesktopHandler::OnWindowInitialized(aura::Window* window) {
 189 }
 190
 191 void X11DesktopHandler::OnWillDestroyEnv() {
 192   g_handler = NULL;
 193   delete this;
 194 }
 195
 196 void X11DesktopHandler::OnActiveWindowChanged(::Window xid,
 197                                               ActiveState active_state) {
 198   if (current_window_ == xid && current_window_active_state_ == active_state)
 199     return;
 200
 201   if (current_window_active_state_ == ACTIVE) {
 202     DesktopWindowTreeHostX11* old_host =
 203         views::DesktopWindowTreeHostX11::GetHostForXID(current_window_);
 204     if (old_host)
 205       old_host->HandleNativeWidgetActivationChanged(false);
 206   }
 207
 208   // Update the current window ID to effectively change the active widget.
 209   current_window_ = xid;
 210   current_window_active_state_ = active_state;
 211
 212   if (active_state == ACTIVE) {
 213     DesktopWindowTreeHostX11* new_host =
 214         views::DesktopWindowTreeHostX11::GetHostForXID(xid);
 215     if (new_host)
 216       new_host->HandleNativeWidgetActivationChanged(true);
 217   }
 218 }
 219
 220 void X11DesktopHandler::OnWindowCreatedOrDestroyed(int event_type,
 221                                                    XID window) {
 222   // Menus created by Chrome can be drag and drop targets. Since they are
 223   // direct children of the screen root window and have override_redirect
 224   // we cannot use regular _NET_CLIENT_LIST_STACKING property to find them
 225   // and use a separate cache to keep track of them.
 226   // TODO(varkha): Implement caching of all top level X windows and their
 227   // coordinates and stacking order to eliminate repeated calls to the X server
 228   // during mouse movement, drag and shaping events.
 229   if (event_type == CreateNotify) {
 230     // The window might be destroyed if the message pump did not get a chance to
 231     // run but we can safely ignore the X error.
 232     gfx::X11ErrorTracker error_tracker;
 233     ui::XMenuList::GetInstance()->MaybeRegisterMenu(window);
 234   } else {
 235     ui::XMenuList::GetInstance()->MaybeUnregisterMenu(window);
 236   }
 237
 238   if (event_type == DestroyNotify) {
 239     // Notify the XForeignWindowManager that |window| has been destroyed.
 240     ui::XForeignWindowManager::GetInstance()->OnWindowDestroyed(window);
 241   }
 242 }
 243
 244 }  // namespace views