aura: A few changes to have aura_demo compile and run on linux.

aura/event_x.cc

+// Copyright (c) 2011 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 "aura/event.h"
+
+#include <X11/Xlib.h>
+#include <X11/extensions/XInput2.h>
+
+#include "base/logging.h"
+#include "ui/base/keycodes/keyboard_code_conversion_x.h"
+
+namespace aura {
+
+namespace {
+
+int GetEventFlagsFromXState(unsigned int state) {
+  int flags = 0;
+  if (state & ControlMask)
+    flags |= ui::EF_CONTROL_DOWN;
+  if (state & ShiftMask)
+    flags |= ui::EF_SHIFT_DOWN;
+  if (state & Mod1Mask)
+    flags |= ui::EF_ALT_DOWN;
+  if (state & LockMask)
+    flags |= ui::EF_CAPS_LOCK_DOWN;
+  if (state & Button1Mask)
+    flags |= ui::EF_LEFT_BUTTON_DOWN;
+  if (state & Button2Mask)
+    flags |= ui::EF_MIDDLE_BUTTON_DOWN;
+  if (state & Button3Mask)
+    flags |= ui::EF_RIGHT_BUTTON_DOWN;
+
+  return flags;
+}
+
+// Get the event flag for the button in XButtonEvent. During a ButtonPress
+// event, |state| in XButtonEvent does not include the button that has just been
+// pressed. Instead |state| contains flags for the buttons (if any) that had
+// already been pressed before the current button, and |button| stores the most
+// current pressed button. So, if you press down left mouse button, and while
+// pressing it down, press down the right mouse button, then for the latter
+// event, |state| would have Button1Mask set but not Button3Mask, and |button|
+// would be 3.
+int GetEventFlagsForButton(int button) {
+  switch (button) {
+    case 1:
+      return ui::EF_LEFT_BUTTON_DOWN;
+    case 2:
+      return ui::EF_MIDDLE_BUTTON_DOWN;
+    case 3:
+      return ui::EF_RIGHT_BUTTON_DOWN;
+  }
+
+  DLOG(WARNING) << "Unexpected button (" << button << ") received.";
+  return 0;
+}
+
+int GetButtonMaskForX2Event(XIDeviceEvent* xievent) {
+  int buttonflags = 0;
+
+  for (int i = 0; i < 8 * xievent->buttons.mask_len; i++) {
+    if (XIMaskIsSet(xievent->buttons.mask, i)) {
+      buttonflags |= GetEventFlagsForButton(i);
+    }
+  }
+
+  return buttonflags;
+}
+
+ui::EventType EventTypeFromNative(NativeEvent native_event) {
+  switch (native_event->type) {
+    case KeyPress:
+      return ui::ET_KEY_PRESSED;
+    case KeyRelease:
+      return ui::ET_KEY_RELEASED;
+    case ButtonPress:
+      if (native_event->xbutton.button == 4 ||
+          native_event->xbutton.button == 5)
+        return ui::ET_MOUSEWHEEL;
+      return ui::ET_MOUSE_PRESSED;
+    case ButtonRelease:
+      if (native_event->xbutton.button == 4 ||
+          native_event->xbutton.button == 5)
+        return ui::ET_MOUSEWHEEL;
+      return ui::ET_MOUSE_RELEASED;
+    case MotionNotify:
+      if (native_event->xmotion.state &
+          (Button1Mask | Button2Mask | Button3Mask))
+        return ui::ET_MOUSE_DRAGGED;
+      return ui::ET_MOUSE_MOVED;
+    case GenericEvent: {
+      XIDeviceEvent* xievent =
+          static_cast<XIDeviceEvent*>(native_event->xcookie.data);
+      // TODO(sad): Determine if sourceid is a touch device.
+      switch (xievent->evtype) {
+        case XI_ButtonPress:
+          return (xievent->detail == 4 || xievent->detail == 5) ?
+              ui::ET_MOUSEWHEEL : ui::ET_MOUSE_PRESSED;
+        case XI_ButtonRelease:
+          return (xievent->detail == 4 || xievent->detail == 5) ?
+              ui::ET_MOUSEWHEEL : ui::ET_MOUSE_RELEASED;
+        case XI_Motion:
+          return GetButtonMaskForX2Event(xievent) ? ui::ET_MOUSE_DRAGGED :
+              ui::ET_MOUSE_MOVED;
+      }
+    }
+    default:
+      NOTREACHED();
+      break;
+  }
+  return ui::ET_UNKNOWN;
+}
+
+gfx::Point GetEventLocation(XEvent* xev) {
+  switch (xev->type) {
+    case ButtonPress:
+    case ButtonRelease:
+      return gfx::Point(xev->xbutton.x, xev->xbutton.y);
+
+    case MotionNotify:
+      return gfx::Point(xev->xmotion.x, xev->xmotion.y);
+
+    case GenericEvent: {
+      XIDeviceEvent* xievent =
+          static_cast<XIDeviceEvent*>(xev->xcookie.data);
+      return gfx::Point(static_cast<int>(xievent->event_x),
+                        static_cast<int>(xievent->event_y));
+    }
+  }
+
+  return gfx::Point();
+}
+
+int GetLocatedEventFlags(XEvent* xev) {
+  switch (xev->type) {
+    case ButtonPress:
+    case ButtonRelease:
+      return GetEventFlagsFromXState(xev->xbutton.state) |
+             GetEventFlagsForButton(xev->xbutton.button);
+
+    case MotionNotify:
+      return GetEventFlagsFromXState(xev->xmotion.state);
+
+    case GenericEvent: {
+      XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
+      bool touch = false;  // TODO(sad): Determine if xievent->sourceid is a
+                           //            touch device.
+      switch (xievent->evtype) {
+        case XI_ButtonPress:
+        case XI_ButtonRelease:
+          return GetButtonMaskForX2Event(xievent) |
+                 GetEventFlagsFromXState(xievent->mods.effective) |
+                 (touch ? 0 : GetEventFlagsForButton(xievent->detail));
+
+        case XI_Motion:
+           return GetButtonMaskForX2Event(xievent) |
+                  GetEventFlagsFromXState(xievent->mods.effective);
+      }
+    }
+  }
+
+  return 0;
+}
+
+}  // namespace
+
+void Event::Init() {
+  memset(&native_event_, 0, sizeof(native_event_));
+}
+
+void Event::InitWithNativeEvent(NativeEvent native_event) {
+  native_event_ = native_event;
+}
+
+LocatedEvent::LocatedEvent(NativeEvent native_event)
+    : Event(native_event, EventTypeFromNative(native_event),
+            GetLocatedEventFlags(native_event)),
+      location_(GetEventLocation(native_event)) {
+}
+
+MouseEvent::MouseEvent(NativeEvent native_event)
+    : LocatedEvent(native_event) {
+}
+
+KeyEvent::KeyEvent(NativeEvent native_event)
+    : Event(native_event,
+            EventTypeFromNative(native_event),
+            GetEventFlagsFromXState(native_event->xbutton.state)),
+      key_code_(ui::KeyboardCodeFromXKeyEvent(native_event)) {
+}
+
+}  // namespace aura