Consolidate/cleanup event cracking code; single out GdkEvents.

ui/base/win/events_win.cc

Index: ui/base/win/events_win.cc
diff --git a/ui/base/win/events_win.cc b/ui/base/win/events_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e841b28e997c7db89d0b175c8e29101635598232
--- /dev/null
+++ b/ui/base/win/events_win.cc
@@ -0,0 +1,210 @@
+// 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 <windowsx.h>
+
+#include "ui/base/events.h"
+
+#include "base/logging.h"
+#include "ui/base/keycodes/keyboard_code_conversion_win.h"
+#include "ui/gfx/point.h"
+
+namespace {
+
+// Get the native mouse key state from the native event message type.
+int GetNativeMouseKey(const ui::NativeEvent& native_event) {
+  switch (native_event.message) {
+    case WM_LBUTTONDBLCLK:
+    case WM_LBUTTONDOWN:
+    case WM_LBUTTONUP:
+    case WM_NCLBUTTONDBLCLK:
+    case WM_NCLBUTTONDOWN:
+    case WM_NCLBUTTONUP:
+      return MK_LBUTTON;
+    case WM_MBUTTONDBLCLK:
+    case WM_MBUTTONDOWN:
+    case WM_MBUTTONUP:
+    case WM_NCMBUTTONDBLCLK:
+    case WM_NCMBUTTONDOWN:
+    case WM_NCMBUTTONUP:
+      return MK_MBUTTON;
+    case WM_RBUTTONDBLCLK:
+    case WM_RBUTTONDOWN:
+    case WM_RBUTTONUP:
+    case WM_NCRBUTTONDBLCLK:
+    case WM_NCRBUTTONDOWN:
+    case WM_NCRBUTTONUP:
+      return MK_RBUTTON;
+    case WM_NCXBUTTONDBLCLK:
+    case WM_NCXBUTTONDOWN:
+    case WM_NCXBUTTONUP:
+    case WM_XBUTTONDBLCLK:
+    case WM_XBUTTONDOWN:
+    case WM_XBUTTONUP:
+      return MK_XBUTTON1;
+  }
+  return 0;
+}
+
+bool IsButtonDown(const ui::NativeEvent& native_event) {
+  return ((MK_LBUTTON | MK_MBUTTON | MK_RBUTTON | MK_XBUTTON1 | MK_XBUTTON2) &
+          native_event.wParam) != 0;
+}
+
+bool IsClientMouseEvent(const ui::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(const ui::NativeEvent& native_event) {
+  return native_event.message == WM_NCMOUSELEAVE ||
+         native_event.message == WM_NCMOUSEHOVER ||
+        (native_event.message >= WM_NCMOUSEMOVE &&
+         native_event.message <= WM_NCXBUTTONDBLCLK);
+}
+
+bool IsDoubleClickMouseEvent(const ui::NativeEvent& native_event) {
+  return native_event.message == WM_NCLBUTTONDBLCLK ||
+         native_event.message == WM_NCMBUTTONDBLCLK ||
+         native_event.message == WM_NCRBUTTONDBLCLK ||
+         native_event.message == WM_NCXBUTTONDBLCLK ||
+         native_event.message == WM_LBUTTONDBLCLK ||
+         native_event.message == WM_MBUTTONDBLCLK ||
+         native_event.message == WM_RBUTTONDBLCLK ||
+         native_event.message == WM_XBUTTONDBLCLK;
+}
+
+// Returns a mask corresponding to the set of pressed modifier keys.
+// Checks the current global state and the state sent by client mouse messages.
+int KeyStateFlagsFromNative(const ui::NativeEvent& native_event) {
+  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;
+  flags |= (HIWORD(native_event.lParam) & KF_EXTENDED) ? ui::EF_EXTENDED : 0;
+
+  // Most client mouse messages include key state information.
+  if (IsClientMouseEvent(native_event)) {
+    int win_flags = GET_KEYSTATE_WPARAM(native_event.wParam);
+    flags |= (win_flags & MK_SHIFT) ? ui::EF_SHIFT_DOWN : 0;
+    flags |= (win_flags & MK_CONTROL) ? ui::EF_CONTROL_DOWN : 0;
+  }
+
+  return flags;
+}
+
+// Returns a mask corresponding to the set of pressed mouse buttons.
+// This includes the button of the given message, even if it is being released.
+int MouseStateFlagsFromNative(const ui::NativeEvent& native_event) {
+  // TODO(msw): ORing the pressed/released button into the flags is _wrong_.
+  // It makes it impossible to tell which button was modified when multiple
+  // buttons are/were held down. Instead, we need to track the modified button
+  // independently and audit event consumers to do the right thing.
+  int win_flags = GetNativeMouseKey(native_event);
+
+  // Client mouse messages provide key states in their WPARAMs.
+  if (IsClientMouseEvent(native_event))
+    win_flags |= GET_KEYSTATE_WPARAM(native_event.wParam);
+
+  int flags = 0;
+  flags |= (win_flags & MK_LBUTTON) ? ui::EF_LEFT_BUTTON_DOWN : 0;
+  flags |= (win_flags & MK_MBUTTON) ? ui::EF_MIDDLE_BUTTON_DOWN : 0;
+  flags |= (win_flags & MK_RBUTTON) ? ui::EF_RIGHT_BUTTON_DOWN : 0;
+  flags |= IsDoubleClickMouseEvent(native_event) ? ui::EF_IS_DOUBLE_CLICK: 0;
+  flags |= IsNonClientMouseEvent(native_event) ? ui::EF_IS_NON_CLIENT : 0;
+  return flags;
+}
+
+}  // namespace
+
+namespace ui {
+
+EventType EventTypeFromNative(const NativeEvent& native_event) {
+  switch (native_event.message) {
+    case WM_KEYDOWN:
+    case WM_SYSKEYDOWN:
+    case WM_CHAR:
+      return ET_KEY_PRESSED;
+    case WM_KEYUP:
+    case WM_SYSKEYUP:
+      return ET_KEY_RELEASED;
+    case WM_LBUTTONDBLCLK:
+    case WM_LBUTTONDOWN:
+    case WM_MBUTTONDBLCLK:
+    case WM_MBUTTONDOWN:
+    case WM_NCLBUTTONDBLCLK:
+    case WM_NCLBUTTONDOWN:
+    case WM_NCMBUTTONDBLCLK:
+    case WM_NCMBUTTONDOWN:
+    case WM_NCRBUTTONDBLCLK:
+    case WM_NCRBUTTONDOWN:
+    case WM_NCXBUTTONDBLCLK:
+    case WM_NCXBUTTONDOWN:
+    case WM_RBUTTONDBLCLK:
+    case WM_RBUTTONDOWN:
+    case WM_XBUTTONDBLCLK:
+    case WM_XBUTTONDOWN:
+      return ET_MOUSE_PRESSED;
+    case WM_LBUTTONUP:
+    case WM_MBUTTONUP:
+    case WM_NCLBUTTONUP:
+    case WM_NCMBUTTONUP:
+    case WM_NCRBUTTONUP:
+    case WM_NCXBUTTONUP:
+    case WM_RBUTTONUP:
+    case WM_XBUTTONUP:
+      return ET_MOUSE_RELEASED;
+    case WM_MOUSEMOVE:
+      return IsButtonDown(native_event) ? ET_MOUSE_DRAGGED : ET_MOUSE_MOVED;
+    case WM_NCMOUSEMOVE:
+      return ET_MOUSE_MOVED;
+    case WM_MOUSEWHEEL:
+      return ET_MOUSEWHEEL;
+    case WM_MOUSELEAVE:
+    case WM_NCMOUSELEAVE:
+      return ET_MOUSE_EXITED;
+    default:
+      NOTREACHED();
+  }
+  return ET_UNKNOWN;
+}
+
+int EventFlagsFromNative(const NativeEvent& native_event) {
+  int flags = KeyStateFlagsFromNative(native_event);
+  if (IsMouseEvent(native_event))
+    flags |= MouseStateFlagsFromNative(native_event);
+
+  return flags;
+}
+
+gfx::Point EventLocationFromNative(const 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);
+}
+
+KeyboardCode KeyboardCodeFromNative(const NativeEvent& native_event) {
+  return KeyboardCodeForWindowsKeyCode(native_event.wParam);
+}
+
+bool IsMouseEvent(const NativeEvent& native_event) {
+  return IsClientMouseEvent(native_event) ||
+         IsNonClientMouseEvent(native_event);
+}
+
+int GetMouseWheelOffset(const NativeEvent& native_event) {
+  DCHECK(native_event.message == WM_MOUSEWHEEL);
+  return GET_WHEEL_DELTA_WPARAM(native_event.wParam);
+}
+
+}  // namespace ui