Add PlatformWindow/Event related code for Ozone X11.

ui/events/platform/x11/x11_event_source_ozone.cc

+// Copyright 2016 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/events/platform/x11/x11_event_source_ozone.h"
+
+#include <X11/Xlib.h>
+#include <X11/extensions/XInput2.h>
+
+#include "base/message_loop/message_loop.h"
+#include "ui/events/event.h"
+#include "ui/events/keycodes/keyboard_code_conversion_x.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
+#include "ui/events/x/events_x_utils.h"
+
+namespace ui {
+
+namespace {
+
+// Translates XI2 XEvent into a ui::Event.
+ui::Event* TranslateXI2EventToEvent(const XEvent& xev) {
+  XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev.xcookie.data);
+  EventType event_type = EventTypeFromXEvent(xev);
+  gfx::Point location = gfx::Point(xievent->event_x, xievent->event_y);
+  gfx::Point root_location = gfx::Point(xievent->root_x, xievent->root_y);
+  int flags = EventFlagsFromXEvent(xev);
+  switch (event_type) {
+    case ET_KEY_PRESSED:
+    case ET_KEY_RELEASED:
+      return new KeyEvent(event_type, KeyboardCodeFromXKeyEvent(&xev), flags);
+    case ET_MOUSE_PRESSED:
+    case ET_MOUSE_MOVED:
+    case ET_MOUSE_DRAGGED:
+    case ET_MOUSE_RELEASED:
+      return new MouseEvent(event_type, location, root_location,
+                            EventTimeFromXEvent(xev), flags,
+                            GetChangedMouseButtonFlagsFromXEvent(xev));
+    case ET_MOUSEWHEEL:
+      return new MouseWheelEvent(GetMouseWheelOffsetFromXEvent(xev), location,
+                                 root_location, EventTimeFromXEvent(xev), flags,
+                                 GetChangedMouseButtonFlagsFromXEvent(xev));
+    case ET_SCROLL_FLING_START:
+    case ET_SCROLL_FLING_CANCEL: {
+      float x_offset, y_offset, x_offset_ordinal, y_offset_ordinal;
+      GetFlingDataFromXEvent(xev, &x_offset, &y_offset, &x_offset_ordinal,
+                             &y_offset_ordinal, nullptr);
+      return new ScrollEvent(event_type, location, EventTimeFromXEvent(xev),
+                             flags, x_offset, y_offset, x_offset_ordinal,
+                             y_offset_ordinal, 0);
+    }
+    case ET_SCROLL: {
+      float x_offset, y_offset, x_offset_ordinal, y_offset_ordinal;
+      int finger_count;
+      GetScrollOffsetsFromXEvent(xev, &x_offset, &y_offset, &x_offset_ordinal,
+                                 &y_offset_ordinal, &finger_count);
+      return new ScrollEvent(event_type, location, EventTimeFromXEvent(xev),
+                             flags, x_offset, y_offset, x_offset_ordinal,
+                             y_offset_ordinal, finger_count);
+    }
+    case ET_TOUCH_MOVED:
+    case ET_TOUCH_PRESSED:
+    case ET_TOUCH_CANCELLED:
+    case ET_TOUCH_RELEASED:
+      return new TouchEvent(event_type, location, GetTouchIdFromXEvent(xev),
+                            EventTimeFromXEvent(xev));
+    case ET_UNKNOWN:
+      return nullptr;
+    default:
+      break;
+  }
+  return nullptr;
+}
+
+// Translates a XEvent into a ui::Event.
+ui::Event* TranslateXEventToEvent(const XEvent& xev) {
+  int flags = EventFlagsFromXEvent(xev);
+  switch (xev.type) {
+    case LeaveNotify:
+    case EnterNotify:
+      // EnterNotify creates ET_MOUSE_MOVED. Mark as synthesized as this is
+      // not real mouse move event.
+      // int flags = GetEventFlagsFromXState(xev.xcrossing.state);
+      if (xev.type == EnterNotify)
+        flags |= EF_IS_SYNTHESIZED;
+      return new MouseEvent(
+          ET_MOUSE_MOVED, gfx::Point(xev.xcrossing.x, xev.xcrossing.y),
+          gfx::Point(xev.xcrossing.x_root, xev.xcrossing.y_root),
+          EventTimeFromXEvent(xev), flags, 0);
+
+    case KeyPress:
+    case KeyRelease:
+      return new KeyEvent(EventTypeFromXEvent(xev),
+                          KeyboardCodeFromXKeyEvent(&xev), flags);
+
+    case ButtonPress:
+    case ButtonRelease: {
+      gfx::Point location = gfx::Point(xev.xbutton.x, xev.xbutton.y);
+      gfx::Point root_location =
+          gfx::Point(xev.xbutton.x_root, xev.xbutton.y_root);
+      switch (EventTypeFromXEvent(xev)) {
+        case ET_MOUSEWHEEL:
+          return new MouseWheelEvent(GetMouseWheelOffsetFromXEvent(xev),
+                                     location, root_location,
+                                     EventTimeFromXEvent(xev), flags, 0);
+        case ET_MOUSE_PRESSED:
+        case ET_MOUSE_RELEASED:
+          return new MouseEvent(EventTypeFromXEvent(xev), location,
+                                root_location, EventTimeFromXEvent(xev), flags,
+                                GetChangedMouseButtonFlagsFromXEvent(xev));
+        case ET_UNKNOWN:
+          // No event is created for X11-release events for mouse-wheel
+          // buttons.
+          break;
+        default:
+          NOTREACHED();
+      }
+      break;
+    }
+
+    case GenericEvent:
+      return TranslateXI2EventToEvent(xev);
+  }
+  return nullptr;
+}
+
+}  // namespace
+
+X11EventSourceOzone::X11EventSourceOzone(XDisplay* display)
+    : X11EventSource(display) {
+  AddEventWatcher();
+}
+
+X11EventSourceOzone::~X11EventSourceOzone() {}
+
+X11EventSourceOzone* X11EventSourceOzone::GetInstance() {
+  return static_cast<X11EventSourceOzone*>(PlatformEventSource::GetInstance());
+}
+
+void X11EventSourceOzone::AddXEventDispatcher(XEventDispatcher* dispatcher) {
+  dispatchers_xevent_.AddObserver(dispatcher);
+}
+
+void X11EventSourceOzone::RemoveXEventDispatcher(XEventDispatcher* dispatcher) {
+  dispatchers_xevent_.RemoveObserver(dispatcher);
+}
+
+uint32_t X11EventSourceOzone::DispatchEvent(base::NativeEvent native_event) {
+  XEvent* xevent = static_cast<XEvent*>(native_event);
+  uint32_t action = POST_DISPATCH_STOP_PROPAGATION;
+  base::NativeEvent translated_event = TranslateXEventToEvent(*xevent);
+  if (translated_event) {
+    action = PlatformEventSource::DispatchEvent(translated_event);
+  } else {
+    // Only if we can't translate XEvent into ui::Event, try to dispatch XEvent
+    // directly to XEventDispatchers.
+    DispatchXEventToXEventDispatchers(xevent);
+  }
+  PostDispatchEvent(xevent);
+  return action;
+}
+
+void X11EventSourceOzone::OnDispatcherListChanged() {
+  AddEventWatcher();
+  X11EventSource::OnDispatcherListChanged();
+}
+
+void X11EventSourceOzone::AddEventWatcher() {
+  if (initialized_)
+    return;
+  if (!base::MessageLoop::current())
+    return;
+
+  int fd = ConnectionNumber(display_);
+  base::MessageLoopForUI::current()->WatchFileDescriptor(
+      fd, true, base::MessagePumpLibevent::WATCH_READ, &watcher_controller_,
+      this);
+  initialized_ = true;
+}
+
+void X11EventSourceOzone::DispatchXEventToXEventDispatchers(XEvent* xevent) {
+  if (dispatchers_xevent_.might_have_observers()) {
+    base::ObserverList<XEventDispatcher>::Iterator iter(&dispatchers_xevent_);
+    while (XEventDispatcher* dispatcher = iter.GetNext()) {
+      if (dispatcher->DispatchXEvent(xevent))
+        break;
+    }
+  }
+}
+
+void X11EventSourceOzone::OnFileCanReadWithoutBlocking(int fd) {
+  DispatchXEvents();
+}
+
+void X11EventSourceOzone::OnFileCanWriteWithoutBlocking(int fd) {
+  NOTREACHED();
+}
+
+}  // namespace ui