linux_aura: Start implementing DesktopRootWindowHostLinux

ui/views/widget/desktop_root_window_host_linux.cc

Index: ui/views/widget/desktop_root_window_host_linux.cc
diff --git a/ui/views/widget/desktop_root_window_host_linux.cc b/ui/views/widget/desktop_root_window_host_linux.cc
index c2f28657a357076baaa232a296e31411b0281a71..1d82f018399839c6966c3b72477587a3ec2b1f48 100644
--- a/ui/views/widget/desktop_root_window_host_linux.cc
+++ b/ui/views/widget/desktop_root_window_host_linux.cc
@@ -4,17 +4,172 @@
 
 #include "ui/views/widget/desktop_root_window_host_linux.h"
 
+#include <X11/extensions/XInput2.h>
+#include <X11/Xatom.h>
+#include <X11/Xutil.h>
+
+#include "base/message_pump_aurax11.h"
+#include "base/stringprintf.h"
+#include "ui/aura/client/screen_position_client.h"
+#include "ui/aura/client/user_action_client.h"
+#include "ui/aura/desktop/desktop_activation_client.h"
+#include "ui/aura/desktop/desktop_dispatcher_client.h"
+#include "ui/aura/focus_manager.h"
 #include "ui/aura/root_window.h"
+#include "ui/aura/shared/compound_event_filter.h"
+#include "ui/aura/shared/input_method_event_filter.h"
+#include "ui/base/touch/touch_factory.h"
+#include "ui/base/x/x11_util.h"
+#include "ui/views/widget/desktop_capture_client.h"
+#include "ui/views/widget/x11_desktop_handler.h"
+#include "ui/views/widget/x11_window_event_filter.h"
 
 namespace views {
 
+namespace {
+
+// Standard Linux mouse buttons for going back and forward.
+const int kBackMouseButton = 8;
+const int kForwardMouseButton = 9;
+
+const char* kAtomsToCache[] = {
+  "WM_DELETE_WINDOW",
+  "_NET_WM_PING",
+  "_NET_WM_PID",
+  "WM_S0",
+  NULL
+};
+
+}  // namespace
+
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostLinux, public:
 
-DesktopRootWindowHostLinux::DesktopRootWindowHostLinux() {
+DesktopRootWindowHostLinux::DesktopRootWindowHostLinux()
+    : xdisplay_(base::MessagePumpAuraX11::GetDefaultXDisplay()),
+      xwindow_(0),
+      x_root_window_(DefaultRootWindow(xdisplay_)),
+      atom_cache_(xdisplay_, kAtomsToCache),
+      window_mapped_(false),
+      focus_when_shown_(false) {
 }
 
 DesktopRootWindowHostLinux::~DesktopRootWindowHostLinux() {
+  base::MessagePumpAuraX11::Current()->RemoveDispatcherForWindow(xwindow_);
+  XDestroyWindow(xdisplay_, xwindow_);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopRootWindowHostLinux, private:
+
+void DesktopRootWindowHostLinux::InitX11Window(const gfx::Rect& bounds) {
+  XSetWindowAttributes swa;
+  memset(&swa, 0, sizeof(swa));
+  swa.background_pixmap = None;
+  xwindow_ = XCreateWindow(
+      xdisplay_, x_root_window_,
+      bounds.x(), bounds.y(), bounds.width(), bounds.height(),
+      0,               // border width
+      CopyFromParent,  // depth
+      InputOutput,
+      CopyFromParent,  // visual
+      CWBackPixmap,
+      &swa);
+  base::MessagePumpAuraX11::Current()->AddDispatcherForWindow(this, xwindow_);
+
+  // TODO(erg): Maybe need to set a ViewProp here like in RWHL::RWHL().
+
+  long event_mask = ButtonPressMask | ButtonReleaseMask | FocusChangeMask |
+                    KeyPressMask | KeyReleaseMask |
+                    EnterWindowMask | LeaveWindowMask |
+                    ExposureMask | VisibilityChangeMask |
+                    StructureNotifyMask | PropertyChangeMask |
+                    PointerMotionMask;
+  XSelectInput(xdisplay_, xwindow_, event_mask);
+  XFlush(xdisplay_);
+
+  // TODO(erg): Something about an invisible cursor here? Don't think I need
+  // it, but this is where it was.
+
+  // TODO(erg): We currently only request window deletion events. We also
+  // should listen for activation events and anything else that GTK+ listens
+  // for, and do something useful.
+  ::Atom protocols[2];
+  protocols[0] = atom_cache_.GetAtom("WM_DELETE_WINDOW");
+  protocols[1] = atom_cache_.GetAtom("_NET_WM_PING");
+  XSetWMProtocols(xdisplay_, xwindow_, protocols, 2);
+
+  // We need a WM_CLIENT_MACHINE and WM_LOCALE_NAME value so we integrate with
+  // the desktop environment.
+  XSetWMProperties(xdisplay_, xwindow_, NULL, NULL, NULL, 0, NULL, NULL, NULL);
+
+  // Likewise, the X server needs to know this window's pid so it knows which
+  // program to kill if the window hangs.
+  pid_t pid = getpid();
+  XChangeProperty(xdisplay_,
+                  xwindow_,
+                  atom_cache_.GetAtom("_NET_WM_PID"),
+                  XA_CARDINAL,
+                  32,
+                  PropModeReplace,
+                  reinterpret_cast<unsigned char*>(&pid), 1);
+
+  // TODO(erg): Now that we're forked from RootWindowHostLinux, we should be
+  // doing a much better job about communicating things like the window title
+  // and icon to the window manager, which should replace this piece of copied
+  // code.
+  static int root_window_number = 0;
+  std::string name = StringPrintf("aura_root_%d", root_window_number++);
+  XStoreName(xdisplay_, xwindow_, name.c_str());
+}
+
+// TODO(erg): This method should basically be everything I need form
+// RootWindowHostLinux::RootWindowHostLinux().
+void DesktopRootWindowHostLinux::InitRootWindow(
+    const Widget::InitParams& params) {
+  aura::RootWindow::CreateParams rw_params(params.bounds);
+  rw_params.host = this;
+  root_window_.reset(new aura::RootWindow(rw_params));
+  root_window_->Init();
+  root_window_->AddChild(content_window_);
+  root_window_host_delegate_ = root_window_.get();
+
+  capture_client_.reset(new DesktopCaptureClient);
+  aura::client::SetCaptureClient(root_window_.get(), capture_client_.get());
+
+  root_window_->set_focus_manager(
+      X11DesktopHandler::get()->get_focus_manager());
+
+  aura::DesktopActivationClient* activation_client =
+      X11DesktopHandler::get()->get_activation_client();
+  aura::client::SetActivationClient(
+      root_window_.get(), activation_client);
+
+  dispatcher_client_.reset(new aura::DesktopDispatcherClient);
+  aura::client::SetDispatcherClient(root_window_.get(),
+                                    dispatcher_client_.get());
+
+  // No event filter for aura::Env. Create CompoundEvnetFilter per RootWindow.
+  root_window_event_filter_ = new aura::shared::CompoundEventFilter;
+  // Pass ownership of the filter to the root_window.
+  root_window_->SetEventFilter(root_window_event_filter_);
+
+  input_method_filter_.reset(new aura::shared::InputMethodEventFilter());
+  input_method_filter_->SetInputMethodPropertyInRootWindow(root_window_.get());
+  root_window_event_filter_->AddFilter(input_method_filter_.get());
+
+  // TODO(erg): Unify this code once the other consumer goes away.
+  x11_window_event_filter_.reset(
+      new X11WindowEventFilter(root_window_.get(), activation_client));
+  x11_window_event_filter_->SetUseHostWindowBorders(false);
+  root_window_event_filter_->AddFilter(x11_window_event_filter_.get());
+}
+
+bool DesktopRootWindowHostLinux::IsWindowManagerPresent() {
+  // Per ICCCM 2.8, "Manager Selections", window managers should take ownership
+  // of WM_Sn selections (where n is a screen number).
+  return XGetSelectionOwner(
+      xdisplay_, atom_cache_.GetAtom("WM_S0")) != None;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -22,8 +177,24 @@ DesktopRootWindowHostLinux::~DesktopRootWindowHostLinux() {
 
 void DesktopRootWindowHostLinux::Init(aura::Window* content_window,
                                       const Widget::InitParams& params) {
-  // TODO(erg):
-  NOTIMPLEMENTED();
+  content_window_ = content_window;
+
+  // TODO(erg): Check whether we *should* be building a RootWindowHost here, or
+  // whether we should be proxying requests to another DRWHL.
+
+  // TODO(erg): We can finally solve the role problem! Based on params, try to
+  // determine whether this is a utility window such as a menu.
+
+  InitX11Window(params.bounds);
+  InitRootWindow(params);
+
+  // TODO(erg): This should be done by a LayoutManager instead of being a
+  // one-off hack.
+  content_window_->SetBounds(params.bounds);
+
+  // This needs to be the intersection of:
+  // - NativeWidgetAura::InitNativeWidget()
+  // - DesktopNativeWidgetHelperAura::PreInitialize()
 }
 
 void DesktopRootWindowHostLinux::Close() {
@@ -32,20 +203,22 @@ void DesktopRootWindowHostLinux::Close() {
 }
 
 void DesktopRootWindowHostLinux::CloseNow() {
-  // TODO(erg):
   NOTIMPLEMENTED();
 }
 
 aura::RootWindowHost* DesktopRootWindowHostLinux::AsRootWindowHost() {
-  // TODO(erg):
-  NOTIMPLEMENTED();
-  return NULL;
+  return this;
 }
 
 void DesktopRootWindowHostLinux::ShowWindowWithState(
     ui::WindowShowState show_state) {
-  // TODO(erg):
-  NOTIMPLEMENTED();
+  if (show_state != ui::SHOW_STATE_DEFAULT &&
+      show_state != ui::SHOW_STATE_NORMAL) {
+    // Only forwarding to Show().
+    NOTIMPLEMENTED();
+  }
+
+  Show();
 }
 
 void DesktopRootWindowHostLinux::ShowMaximizedWithBounds(
@@ -55,9 +228,7 @@ void DesktopRootWindowHostLinux::ShowMaximizedWithBounds(
 }
 
 bool DesktopRootWindowHostLinux::IsVisible() const {
-  // TODO(erg):
-  NOTIMPLEMENTED();
-  return true;
+  return window_mapped_;
 }
 
 void DesktopRootWindowHostLinux::SetSize(const gfx::Size& size) {
@@ -73,8 +244,8 @@ void DesktopRootWindowHostLinux::CenterWindow(const gfx::Size& size) {
 void DesktopRootWindowHostLinux::GetWindowPlacement(
     gfx::Rect* bounds,
     ui::WindowShowState* show_state) const {
-      // TODO(erg):
-      NOTIMPLEMENTED();
+  // TODO(erg):
+  NOTIMPLEMENTED();
 }
 
 gfx::Rect DesktopRootWindowHostLinux::GetWindowBoundsInScreen() const {
@@ -177,6 +348,351 @@ void DesktopRootWindowHostLinux::SetWindowTitle(const string16& title) {
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// DesktopRootWindowHostLinux, aura::RootWindowHost implementation:
+
+aura::RootWindow* DesktopRootWindowHostLinux::GetRootWindow() {
+  return root_window_.get();
+}
+
+gfx::AcceleratedWidget DesktopRootWindowHostLinux::GetAcceleratedWidget() {
+  return xwindow_;
+}
+
+void DesktopRootWindowHostLinux::Show() {
+  if (!window_mapped_) {
+    // Before we map the window, set size hints. Otherwise, some window managers
+    // will ignore toplevel XMoveWindow commands.
+    XSizeHints size_hints;
+    size_hints.flags = PPosition;
+    size_hints.x = bounds_.x();
+    size_hints.y = bounds_.y();
+    XSetWMNormalHints(xdisplay_, xwindow_, &size_hints);
+
+    XMapWindow(xdisplay_, xwindow_);
+
+    // We now block until our window is mapped. Some X11 APIs will crash and
+    // burn if passed |xwindow_| before the window is mapped, and XMapWindow is
+    // asynchronous.
+    base::MessagePumpAuraX11::Current()->BlockUntilWindowMapped(xwindow_);
+    window_mapped_ = true;
+  }
+}
+
+void DesktopRootWindowHostLinux::Hide() {
+  if (window_mapped_) {
+    XWithdrawWindow(xdisplay_, xwindow_, 0);
+    window_mapped_ = false;
+  }
+}
+
+void DesktopRootWindowHostLinux::ToggleFullScreen() {
+}
+
+gfx::Rect DesktopRootWindowHostLinux::GetBounds() const {
+  return gfx::Rect(100, 100);
+}
+
+void DesktopRootWindowHostLinux::SetBounds(const gfx::Rect& bounds) {
+}
+
+gfx::Point DesktopRootWindowHostLinux::GetLocationOnNativeScreen() const {
+  return gfx::Point(1, 1);
+}
+
+void DesktopRootWindowHostLinux::SetCapture() {
+}
+
+void DesktopRootWindowHostLinux::ReleaseCapture() {
+}
+
+void DesktopRootWindowHostLinux::SetCursor(gfx::NativeCursor cursor) {
+}
+
+void DesktopRootWindowHostLinux::ShowCursor(bool show) {
+}
+
+bool DesktopRootWindowHostLinux::QueryMouseLocation(
+    gfx::Point* location_return) {
+  return false;
+}
+
+bool DesktopRootWindowHostLinux::ConfineCursorToRootWindow() {
+  return false;
+}
+
+void DesktopRootWindowHostLinux::UnConfineCursor() {
+}
+
+void DesktopRootWindowHostLinux::MoveCursorTo(const gfx::Point& location) {
+}
+
+void DesktopRootWindowHostLinux::SetFocusWhenShown(bool focus_when_shown) {
+  static const char* k_NET_WM_USER_TIME = "_NET_WM_USER_TIME";
+  focus_when_shown_ = focus_when_shown;
+  if (IsWindowManagerPresent() && !focus_when_shown_) {
+    ui::SetIntProperty(xwindow_,
+                       k_NET_WM_USER_TIME,
+                       k_NET_WM_USER_TIME,
+                       0);
+  }
+}
+
+bool DesktopRootWindowHostLinux::GrabSnapshot(
+      const gfx::Rect& snapshot_bounds,
+      std::vector<unsigned char>* png_representation) {
+  return false;
+}
+
+void DesktopRootWindowHostLinux::PostNativeEvent(
+    const base::NativeEvent& native_event) {
+  DCHECK(xwindow_);
+  DCHECK(xdisplay_);
+  XEvent xevent = *native_event;
+  xevent.xany.display = xdisplay_;
+  xevent.xany.window = xwindow_;
+
+  switch (xevent.type) {
+    case EnterNotify:
+    case LeaveNotify:
+    case MotionNotify:
+    case KeyPress:
+    case KeyRelease:
+    case ButtonPress:
+    case ButtonRelease: {
+      // The fields used below are in the same place for all of events
+      // above. Using xmotion from XEvent's unions to avoid repeating
+      // the code.
+      xevent.xmotion.root = x_root_window_;
+      xevent.xmotion.time = CurrentTime;
+
+      gfx::Point point(xevent.xmotion.x, xevent.xmotion.y);
+      root_window_->ConvertPointToNativeScreen(&point);
+      xevent.xmotion.x_root = point.x();
+      xevent.xmotion.y_root = point.y();
+    }
+    default:
+      break;
+  }
+  XSendEvent(xdisplay_, xwindow_, False, 0, &xevent);
+}
+
+void DesktopRootWindowHostLinux::OnDeviceScaleFactorChanged(
+    float device_scale_factor) {
+}
+
+void DesktopRootWindowHostLinux::PrepareForShutdown() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopRootWindowHostLinux, MessageLoop::Dispatcher implementation:
+
+bool DesktopRootWindowHostLinux::Dispatch(const base::NativeEvent& event) {
+  XEvent* xev = event;
+
+  // May want to factor CheckXEventForConsistency(xev); into a common location
+  // since it is called here.
+  switch (xev->type) {
+    case Expose:
+      // TODO(erg): Can we only redraw the affected areas?
+      root_window_host_delegate_->OnHostPaint();
+      break;
+    case KeyPress: {
+      ui::KeyEvent keydown_event(xev, false);
+      root_window_host_delegate_->OnHostKeyEvent(&keydown_event);
+      break;
+    }
+    case KeyRelease: {
+      ui::KeyEvent keyup_event(xev, false);
+      root_window_host_delegate_->OnHostKeyEvent(&keyup_event);
+      break;
+    }
+    case ButtonPress: {
+      if (static_cast<int>(xev->xbutton.button) == kBackMouseButton ||
+          static_cast<int>(xev->xbutton.button) == kForwardMouseButton) {
+        aura::client::UserActionClient* gesture_client =
+            aura::client::GetUserActionClient(root_window_.get());
+        if (gesture_client) {
+          gesture_client->OnUserAction(
+              static_cast<int>(xev->xbutton.button) == kBackMouseButton ?
+              aura::client::UserActionClient::BACK :
+              aura::client::UserActionClient::FORWARD);
+        }
+        break;
+      }
+    }  // fallthrough
+    case ButtonRelease: {
+      ui::MouseEvent mouseev(xev);
+      root_window_host_delegate_->OnHostMouseEvent(&mouseev);
+      break;
+    }
+    case FocusOut:
+      if (xev->xfocus.mode != NotifyGrab)
+        root_window_host_delegate_->OnHostLostCapture();
+      break;
+    case ConfigureNotify: {
+      DCHECK_EQ(xwindow_, xev->xconfigure.window);
+      DCHECK_EQ(xwindow_, xev->xconfigure.event);
+      // It's possible that the X window may be resized by some other means than
+      // from within aura (e.g. the X window manager can change the size). Make
+      // sure the root window size is maintained properly.
+      gfx::Rect bounds(xev->xconfigure.x, xev->xconfigure.y,
+                       xev->xconfigure.width, xev->xconfigure.height);
+      bool size_changed = bounds_.size() != bounds.size();
+      bool origin_changed = bounds_.origin() != bounds.origin();
+      bounds_ = bounds;
+      if (size_changed)
+        root_window_host_delegate_->OnHostResized(bounds.size());
+      if (origin_changed)
+        root_window_host_delegate_->OnHostMoved(bounds_.origin());
+      break;
+    }
+    case GenericEvent: {
+      ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
+      if (!factory->ShouldProcessXI2Event(xev))
+        break;
+
+      ui::EventType type = ui::EventTypeFromNative(xev);
+      XEvent last_event;
+      int num_coalesced = 0;
+
+      switch (type) {
+        // case ui::ET_TOUCH_MOVED:
+        //   num_coalesced = CoalescePendingMotionEvents(xev, &last_event);
+        //   if (num_coalesced > 0)
+        //     xev = &last_event;
+        //   // fallthrough
+        // case ui::ET_TOUCH_PRESSED:
+        // case ui::ET_TOUCH_RELEASED: {
+        //   ui::TouchEvent touchev(xev);
+        //   root_window_host_delegate_->OnHostTouchEvent(&touchev);
+        //   break;
+        // }
+        case ui::ET_MOUSE_MOVED:
+        case ui::ET_MOUSE_DRAGGED:
+        case ui::ET_MOUSE_PRESSED:
+        case ui::ET_MOUSE_RELEASED:
+        case ui::ET_MOUSE_ENTERED:
+        case ui::ET_MOUSE_EXITED: {
+          if (type == ui::ET_MOUSE_MOVED || type == ui::ET_MOUSE_DRAGGED) {
+            // If this is a motion event, we want to coalesce all pending motion
+            // events that are at the top of the queue.
+            // num_coalesced = CoalescePendingMotionEvents(xev, &last_event);
+            // if (num_coalesced > 0)
+            //   xev = &last_event;
+          } else if (type == ui::ET_MOUSE_PRESSED) {
+            XIDeviceEvent* xievent =
+                static_cast<XIDeviceEvent*>(xev->xcookie.data);
+            int button = xievent->detail;
+            if (button == kBackMouseButton || button == kForwardMouseButton) {
+              aura::client::UserActionClient* gesture_client =
+                  aura::client::GetUserActionClient(
+                      root_window_host_delegate_->AsRootWindow());
+              if (gesture_client) {
+                bool reverse_direction =
+                    ui::IsTouchpadEvent(xev) && ui::IsNaturalScrollEnabled();
+                gesture_client->OnUserAction(
+                    (button == kBackMouseButton && !reverse_direction) ||
+                    (button == kForwardMouseButton && reverse_direction) ?
+                    aura::client::UserActionClient::BACK :
+                    aura::client::UserActionClient::FORWARD);
+              }
+              break;
+            }
+          }
+          ui::MouseEvent mouseev(xev);
+          root_window_host_delegate_->OnHostMouseEvent(&mouseev);
+          break;
+        }
+        case ui::ET_MOUSEWHEEL: {
+          ui::MouseWheelEvent mouseev(xev);
+          root_window_host_delegate_->OnHostMouseEvent(&mouseev);
+          break;
+        }
+        case ui::ET_SCROLL_FLING_START:
+        case ui::ET_SCROLL_FLING_CANCEL:
+        case ui::ET_SCROLL: {
+          ui::ScrollEvent scrollev(xev);
+          root_window_host_delegate_->OnHostScrollEvent(&scrollev);
+          break;
+        }
+        case ui::ET_UNKNOWN:
+          break;
+        default:
+          NOTREACHED();
+      }
+
+      // If we coalesced an event we need to free its cookie.
+      if (num_coalesced > 0)
+        XFreeEventData(xev->xgeneric.display, &last_event.xcookie);
+      break;
+    }
+    case MapNotify: {
+      // If there's no window manager running, we need to assign the X input
+      // focus to our host window.
+      if (!IsWindowManagerPresent() && focus_when_shown_)
+        XSetInputFocus(xdisplay_, xwindow_, RevertToNone, CurrentTime);
+      break;
+    }
+    case ClientMessage: {
+      Atom message_type = static_cast<Atom>(xev->xclient.data.l[0]);
+      if (message_type == atom_cache_.GetAtom("WM_DELETE_WINDOW")) {
+        // We have received a close message from the window manager.
+        root_window_->OnRootWindowHostCloseRequested();
+      } else if (message_type == atom_cache_.GetAtom("_NET_WM_PING")) {
+        XEvent reply_event = *xev;
+        reply_event.xclient.window = x_root_window_;
+
+        XSendEvent(xdisplay_,
+                   reply_event.xclient.window,
+                   False,
+                   SubstructureRedirectMask | SubstructureNotifyMask,
+                   &reply_event);
+      }
+      break;
+    }
+    case MappingNotify: {
+      switch (xev->xmapping.request) {
+        case MappingModifier:
+        case MappingKeyboard:
+          XRefreshKeyboardMapping(&xev->xmapping);
+          root_window_->OnKeyboardMappingChanged();
+          break;
+        case MappingPointer:
+          ui::UpdateButtonMap();
+          break;
+        default:
+          NOTIMPLEMENTED() << " Unknown request: " << xev->xmapping.request;
+          break;
+      }
+      break;
+    }
+    case MotionNotify: {
+      // Discard all but the most recent motion event that targets the same
+      // window with unchanged state.
+      XEvent last_event;
+      while (XPending(xev->xany.display)) {
+        XEvent next_event;
+        XPeekEvent(xev->xany.display, &next_event);
+        if (next_event.type == MotionNotify &&
+            next_event.xmotion.window == xev->xmotion.window &&
+            next_event.xmotion.subwindow == xev->xmotion.subwindow &&
+            next_event.xmotion.state == xev->xmotion.state) {
+          XNextEvent(xev->xany.display, &last_event);
+          xev = &last_event;
+        } else {
+          break;
+        }
+      }
+
+      ui::MouseEvent mouseev(xev);
+      root_window_host_delegate_->OnHostMouseEvent(&mouseev);
+      break;
+    }
+  }
+  return true;
+}
+
+////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHost, public:
 
 // static