Add PlatformWindow/Event related code for Ozone X11.

ui/events/platform/x11/x11_event_source_libevent.cc

 // Copyright 2014 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.h"
+#include "ui/events/platform/x11/x11_event_source_libevent.h"
 
 #include <X11/Xlib.h>
+#include <X11/extensions/XInput2.h>
 
-#include "base/macros.h"
 #include "base/message_loop/message_loop.h"
-#include "base/message_loop/message_pump_libevent.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 {
 
-class X11EventSourceLibevent : public X11EventSource,
-                               public base::MessagePumpLibevent::Watcher {
- public:
-  explicit X11EventSourceLibevent(XDisplay* display)
-      : X11EventSource(display),
-        initialized_(false) {
-    AddEventWatcher();
+// Translates XI2 XEvent into a ui::Event.
+scoped_ptr<ui::Event> TranslateXI2EventToEvent(const XEvent& xev) {
+  EventType event_type = EventTypeFromXEvent(xev);
+  switch (event_type) {
+    case ET_KEY_PRESSED:
+    case ET_KEY_RELEASED:
+      return make_scoped_ptr(new KeyEvent(event_type,
+                                          KeyboardCodeFromXKeyEvent(&xev),
+                                          EventFlagsFromXEvent(xev)));
+    case ET_MOUSE_PRESSED:
+    case ET_MOUSE_MOVED:
+    case ET_MOUSE_DRAGGED:
+    case ET_MOUSE_RELEASED:
+      return make_scoped_ptr(
+          new MouseEvent(event_type, EventLocationFromXEvent(xev),
+                         EventSystemLocationFromXEvent(xev),
+                         EventTimeFromXEvent(xev), EventFlagsFromXEvent(xev),
+                         GetChangedMouseButtonFlagsFromXEvent(xev)));
+    case ET_MOUSEWHEEL:
+      return make_scoped_ptr(new MouseWheelEvent(
+          GetMouseWheelOffsetFromXEvent(xev), EventLocationFromXEvent(xev),
+          EventSystemLocationFromXEvent(xev), EventTimeFromXEvent(xev),
+          EventFlagsFromXEvent(xev),
+          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 make_scoped_ptr(new ScrollEvent(
+          event_type, EventLocationFromXEvent(xev), EventTimeFromXEvent(xev),
+          EventFlagsFromXEvent(xev), 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 make_scoped_ptr(new ScrollEvent(
+          event_type, EventLocationFromXEvent(xev), EventTimeFromXEvent(xev),
+          EventFlagsFromXEvent(xev), 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 make_scoped_ptr(
+          new TouchEvent(event_type, EventLocationFromXEvent(xev),
+                         GetTouchIdFromXEvent(xev), EventTimeFromXEvent(xev)));
+    case ET_UNKNOWN:
+      return nullptr;
+    default:
+      break;
   }
+  return nullptr;
+}
 
-  ~X11EventSourceLibevent() override {
+// Translates a XEvent into a ui::Event.
+scoped_ptr<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.
+      if (xev.type == EnterNotify)
+        flags |= EF_IS_SYNTHESIZED;
+      return make_scoped_ptr(
+          new MouseEvent(ET_MOUSE_MOVED, EventLocationFromXEvent(xev),
+                         EventSystemLocationFromXEvent(xev),
+                         EventTimeFromXEvent(xev), flags, 0));
+
+    case KeyPress:
+    case KeyRelease:
+      return make_scoped_ptr(new KeyEvent(
+          EventTypeFromXEvent(xev), KeyboardCodeFromXKeyEvent(&xev), flags));
+
+    case ButtonPress:
+    case ButtonRelease: {
+      switch (EventTypeFromXEvent(xev)) {
+        case ET_MOUSEWHEEL:
+          return make_scoped_ptr(new MouseWheelEvent(
+              GetMouseWheelOffsetFromXEvent(xev), EventLocationFromXEvent(xev),
+              EventSystemLocationFromXEvent(xev), EventTimeFromXEvent(xev),
+              flags, 0));
+        case ET_MOUSE_PRESSED:
+        case ET_MOUSE_RELEASED:
+          return make_scoped_ptr(new MouseEvent(
+              EventTypeFromXEvent(xev), EventLocationFromXEvent(xev),
+              EventSystemLocationFromXEvent(xev), 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);
   }
-
- private:
-  void 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;
-  }
-
-  // PlatformEventSource:
-  void OnDispatcherListChanged() override {
-    AddEventWatcher();
-  }
-
-  // base::MessagePumpLibevent::Watcher:
-  void OnFileCanReadWithoutBlocking(int fd) override {
-    DispatchXEvents();
-  }
-
-  void OnFileCanWriteWithoutBlocking(int fd) override {
-    NOTREACHED();
-  }
-
-  base::MessagePumpLibevent::FileDescriptorWatcher watcher_controller_;
-  bool initialized_;
-
-  DISALLOW_COPY_AND_ASSIGN(X11EventSourceLibevent);
-};
+  return nullptr;
+}
 
 }  // namespace
 
-scoped_ptr<PlatformEventSource> PlatformEventSource::CreateDefault() {
-  return make_scoped_ptr(new X11EventSourceLibevent(gfx::GetXDisplay()));
+X11EventSourceLibevent::X11EventSourceLibevent(XDisplay* display)
+    : event_source_(this, display) {
+  AddEventWatcher();
+}
+
+X11EventSourceLibevent::~X11EventSourceLibevent() {}
+
+void X11EventSourceLibevent::AddXEventDispatcher(XEventDispatcher* dispatcher) {
+  dispatchers_xevent_.AddObserver(dispatcher);
+}
+
+void X11EventSourceLibevent::RemoveXEventDispatcher(
+    XEventDispatcher* dispatcher) {
+  dispatchers_xevent_.RemoveObserver(dispatcher);
+}
+
+void X11EventSourceLibevent::ProcessXEvent(XEvent* xevent) {
+  scoped_ptr<ui::Event> translated_event = TranslateXEventToEvent(*xevent);
+  if (translated_event) {
+    DispatchEvent(translated_event.get());
+  } else {
+    // Only if we can't translate XEvent into ui::Event, try to dispatch XEvent
+    // directly to XEventDispatchers.
+    DispatchXEventToXEventDispatchers(xevent);
+  }
+}
+
+void X11EventSourceLibevent::AddEventWatcher() {
+  if (initialized_)
+    return;
+  if (!base::MessageLoop::current())
+    return;
+
+  int fd = ConnectionNumber(event_source_.display());
+  base::MessageLoopForUI::current()->WatchFileDescriptor(
+      fd, true, base::MessagePumpLibevent::WATCH_READ, &watcher_controller_,
+      this);
+  initialized_ = true;
+}
+
+void X11EventSourceLibevent::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 X11EventSourceLibevent::StopCurrentEventStream() {
+  event_source_.StopCurrentEventStream();
+}
+
+void X11EventSourceLibevent::OnDispatcherListChanged() {
+  AddEventWatcher();
+  event_source_.OnDispatcherListChanged();
+}
+
+void X11EventSourceLibevent::OnFileCanReadWithoutBlocking(int fd) {
+  event_source_.DispatchXEvents();
+}
+
+void X11EventSourceLibevent::OnFileCanWriteWithoutBlocking(int fd) {
+  NOTREACHED();
 }
 
 }  // namespace ui