V2

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;
+  if (GetKeyState(VK_MENU) & 0x80)
+    flags |= Event::EF_ALT_DOWN;
+  if (GetKeyState(VK_SHIFT) & 0x80)
+    flags |= Event::EF_SHIFT_DOWN;
+  if (GetKeyState(VK_CONTROL) & 0x80)
+    flags |= Event::EF_CONTROL_DOWN;
+  return flags;
+}
+
+// Convert windows message identifiers to Event types.
+Event::EventType EventTypeFromNative(NativeEvent native_event) {
+  switch (native_event.message) {
+    case WM_KEYDOWN:
+    case WM_SYSKEYDOWN:
+      return Event::ET_KEY_PRESSED;
+    case WM_KEYUP:
+    case WM_SYSKEYUP:
+      return Event::ET_KEY_RELEASED;
+    case WM_LBUTTONDOWN:
+    case WM_MBUTTONDOWN:
+    case WM_NCLBUTTONDOWN:
+    case WM_NCMBUTTONDOWN:
+    case WM_NCRBUTTONDOWN:
+    case WM_RBUTTONDOWN:
+      return 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 Event::ET_MOUSE_RELEASED;
+    case WM_MOUSEMOVE:
+    case WM_NCMOUSEMOVE:
+      return Event::ET_MOUSE_MOVED;
+    case WM_MOUSEWHEEL:
+      return Event::ET_MOUSEWHEEL;
+    case WM_MOUSELEAVE:
+    case WM_NCMOUSELEAVE:
+      return Event::ET_MOUSE_EXITED;
+    default:
+      NOTREACHED();
+  }
+  return Event::ET_UNKNOWN;
+}
+
+bool IsClientMouseEvent(NativeEvent native_event) {
+  return native_event.message == WM_MOUSELEAVE ||
+        (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_NCMOUSEMOVE &&
+         native_event.message <= WM_NCMBUTTONDBLCLK);
+}
+
+gfx::Point MousePositionFromNative(NativeEvent native_event) {
+  if (IsClientMouseEvent(native_event)) {
+    // Client message. The position is contained in the LPARAM.
+    return gfx::Point(GET_X_LPARAM(native_event.lParam),
+                      GET_Y_LPARAM(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 |= 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 |= MouseEvent::EF_IS_DOUBLE_CLICK;
+      break;
+  }
+
+  // Check for pressed buttons.
+  if (IsClientMouseEvent(native_event)) {
+    if (native_event.wParam & MK_LBUTTON)
+      flags |= Event::EF_LEFT_BUTTON_DOWN;
+    if (native_event.wParam & MK_MBUTTON)
+      flags |= Event::EF_MIDDLE_BUTTON_DOWN;
+    if (native_event.wParam & MK_RBUTTON)
+      flags |= Event::EF_RIGHT_BUTTON_DOWN;
+  } else if (IsNonClientMouseEvent(native_event)) {
+    switch (native_event.message) {
+      case WM_NCLBUTTONDOWN:
+        flags |= Event::EF_LEFT_BUTTON_DOWN;
+        break;
+      case WM_NCMBUTTONDOWN:
+        flags |= Event::EF_MIDDLE_BUTTON_DOWN;
+        break;
+      case WM_NCRBUTTONDOWN:
+        flags |= Event::EF_RIGHT_BUTTON_DOWN;
+        break;
+    }
+  }
+
+  // Finally make sure the key state flags are included.
+  return flags | GetKeyStateFlags();
+}
+
+int MouseWheelEventFlagsFromNative(NativeEvent native_event) {
+  int native_flags = GET_KEYSTATE_WPARAM(native_event.wParam);
+  int flags = 0;
+  if (native_flags & MK_CONTROL)
+    flags |= Event::EF_CONTROL_DOWN;
+  if (native_flags & MK_SHIFT)
+    flags |= Event::EF_SHIFT_DOWN;
+  if (GetKeyState(VK_MENU) < 0)
+    flags |= Event::EF_ALT_DOWN;
+  if (native_flags & MK_LBUTTON)
+    flags |= Event::EF_LEFT_BUTTON_DOWN;
+  if (native_flags & MK_MBUTTON)
+    flags |= Event::EF_MIDDLE_BUTTON_DOWN;
+  if (native_flags & MK_RBUTTON)
+    flags |= Event::EF_RIGHT_BUTTON_DOWN;
+  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
+