Consolidate/cleanup event cracking code; single out GdkEvents.

ui/views/events/event_win.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 "ui/views/events/event.h"
-
-#include <windowsx.h>
-
-#include "base/logging.h"
-#include "ui/base/keycodes/keyboard_code_conversion_win.h"
-
-namespace ui {
-
-namespace {
-
-// Returns a mask corresponding to the set of modifier keys that are currently
-// pressed. Windows key messages don't come with control key state as parameters
-// as with mouse messages, so we need to explicitly ask for these states.
-int GetKeyStateFlags() {
-  int flags = 0;
-  flags |= (GetKeyState(VK_MENU) & 0x80)? ui::EF_ALT_DOWN : 0;
-  flags |= (GetKeyState(VK_SHIFT) & 0x80)? ui::EF_SHIFT_DOWN : 0;
-  flags |= (GetKeyState(VK_CONTROL) & 0x80)? ui::EF_CONTROL_DOWN : 0;
-  return flags;
-}
-
-// Convert windows message identifiers to Event types.
-ui::Event::EventType EventTypeFromNative(NativeEvent native_event) {
-  switch (native_event.message) {
-    case WM_KEYDOWN:
-    case WM_SYSKEYDOWN:
-    case WM_CHAR:
-      return ui::Event::ET_KEY_PRESSED;
-    case WM_KEYUP:
-    case WM_SYSKEYUP:
-      return ui::Event::ET_KEY_RELEASED;
-    case WM_LBUTTONDOWN:
-    case WM_MBUTTONDOWN:
-    case WM_NCLBUTTONDOWN:
-    case WM_NCMBUTTONDOWN:
-    case WM_NCRBUTTONDOWN:
-    case WM_RBUTTONDOWN:
-      return ui::Event::ET_MOUSE_PRESSED;
-    case WM_LBUTTONDBLCLK:
-    case WM_LBUTTONUP:
-    case WM_MBUTTONDBLCLK:
-    case WM_MBUTTONUP:
-    case WM_NCLBUTTONDBLCLK:
-    case WM_NCLBUTTONUP:
-    case WM_NCMBUTTONDBLCLK:
-    case WM_NCMBUTTONUP:
-    case WM_NCRBUTTONDBLCLK:
-    case WM_NCRBUTTONUP:
-    case WM_RBUTTONDBLCLK:
-    case WM_RBUTTONUP:
-      return ui::Event::ET_MOUSE_RELEASED;
-    case WM_MOUSEMOVE:
-    case WM_NCMOUSEMOVE:
-      return ui::Event::ET_MOUSE_MOVED;
-    case WM_MOUSEWHEEL:
-      return ui::Event::ET_MOUSEWHEEL;
-    case WM_MOUSELEAVE:
-    case WM_NCMOUSELEAVE:
-      return ui::Event::ET_MOUSE_EXITED;
-    default:
-      NOTREACHED();
-  }
-  return ui::Event::ET_UNKNOWN;
-}
-
-bool IsClientMouseEvent(NativeEvent native_event) {
-  return native_event.message == WM_MOUSELEAVE ||
-         native_event.message == WM_MOUSEHOVER ||
-        (native_event.message >= WM_MOUSEFIRST &&
-         native_event.message <= WM_MOUSELAST);
-}
-
-bool IsNonClientMouseEvent(NativeEvent native_event) {
-  return native_event.message == WM_NCMOUSELEAVE ||
-         native_event.message == WM_NCMOUSEHOVER ||
-        (native_event.message >= WM_NCMOUSEMOVE &&
-         native_event.message <= WM_NCXBUTTONDBLCLK);
-}
-
-gfx::Point MousePositionFromNative(NativeEvent native_event) {
-  // Client message. The position is contained in the LPARAM.
-  if (IsClientMouseEvent(native_event))
-    return gfx::Point(native_event.lParam);
-  DCHECK(IsNonClientMouseEvent(native_event));
-  // Non-client message. The position is contained in a POINTS structure in
-  // LPARAM, and is in screen coordinates so we have to convert to client.
-  POINT native_point = { GET_X_LPARAM(native_event.lParam),
-                         GET_Y_LPARAM(native_event.lParam) };
-  ScreenToClient(native_event.hwnd, &native_point);
-  return gfx::Point(native_point);
-}
-
-int MouseEventFlagsFromNative(NativeEvent native_event) {
-  int flags = 0;
-
-  // Check if the event occurred in the non-client area.
-  if (IsNonClientMouseEvent(native_event))
-    flags |= ui::MouseEvent::EF_IS_NON_CLIENT;
-
-  // Check for double click events.
-  switch (native_event.message) {
-    case WM_NCLBUTTONDBLCLK:
-    case WM_NCMBUTTONDBLCLK:
-    case WM_NCRBUTTONDBLCLK:
-    case WM_LBUTTONDBLCLK:
-    case WM_MBUTTONDBLCLK:
-    case WM_RBUTTONDBLCLK:
-      flags |= ui::MouseEvent::EF_IS_DOUBLE_CLICK;
-      break;
-  }
-
-  // Check for pressed buttons.
-  if (IsClientMouseEvent(native_event)) {
-    if (native_event.wParam & MK_LBUTTON)
-      flags |= ui::MouseEvent::EF_LEFT_BUTTON_DOWN;
-    if (native_event.wParam & MK_MBUTTON)
-      flags |= ui::MouseEvent::EF_MIDDLE_BUTTON_DOWN;
-    if (native_event.wParam & MK_RBUTTON)
-      flags |= ui::MouseEvent::EF_RIGHT_BUTTON_DOWN;
-  } else if (IsNonClientMouseEvent(native_event)) {
-    switch (native_event.message) {
-      case WM_NCLBUTTONDOWN:
-        flags |= ui::MouseEvent::EF_LEFT_BUTTON_DOWN;
-        break;
-      case WM_NCMBUTTONDOWN:
-        flags |= ui::MouseEvent::EF_MIDDLE_BUTTON_DOWN;
-        break;
-      case WM_NCRBUTTONDOWN:
-        flags |= ui::MouseEvent::EF_RIGHT_BUTTON_DOWN;
-        break;
-    }
-  }
-
-  // Finally make sure the key state flags are included.
-  return flags | GetKeyStateFlags();
-}
-
-int MouseWheelEventFlagsFromNative(NativeEvent native_event) {
-  int win_flags = GET_KEYSTATE_WPARAM(native_event.wParam);
-  int flags = 0;
-  flags |= (win_flags & MK_CONTROL) ? ui::MouseEvent::EF_CONTROL_DOWN : 0;
-  flags |= (win_flags & MK_SHIFT) ? ui::MouseEvent::EF_SHIFT_DOWN : 0;
-  flags |= (GetKeyState(VK_MENU) < 0) ? ui::MouseEvent::EF_ALT_DOWN : 0;
-  flags |= (win_flags & MK_LBUTTON) ? ui::MouseEvent::EF_LEFT_BUTTON_DOWN : 0;
-  flags |= (win_flags & MK_MBUTTON) ? ui::MouseEvent::EF_MIDDLE_BUTTON_DOWN : 0;
-  flags |= (win_flags & MK_RBUTTON) ? ui::MouseEvent::EF_RIGHT_BUTTON_DOWN : 0;
-  return flags;
-}
-
-}  // namespace
-
-////////////////////////////////////////////////////////////////////////////////
-// KeyEvent, public:
-
-KeyEvent::KeyEvent(NativeEvent native_event)
-    : Event(EventTypeFromNative(native_event), GetKeyStateFlags()),
-      key_code_(KeyboardCodeForWindowsKeyCode(native_event.wParam)),
-      repeat_count_(native_event.lParam & 0xFFFF),
-      message_flags_((native_event.lParam & 0xFFFF0000) >> 16) {
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// MouseEvent, public:
-
-MouseEvent::MouseEvent(NativeEvent native_event)
-    : LocatedEvent(EventTypeFromNative(native_event),
-                   MousePositionFromNative(native_event),
-                   MouseEventFlagsFromNative(native_event)) {
-}
-
-////////////////////////////////////////////////////////////////////////////////
-// MouseWheelEvent, public:
-
-MouseWheelEvent::MouseWheelEvent(NativeEvent native_event)
-    : LocatedEvent(ET_MOUSEWHEEL,
-                   MousePositionFromNative(native_event),
-                   MouseWheelEventFlagsFromNative(native_event)),
-      offset_(GET_WHEEL_DELTA_WPARAM(native_event.wParam)) {
-}
-
-}  // namespace ui
-