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// 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 |= ui::EF_ALT_DOWN;
if (GetKeyState(VK_SHIFT) & 0x80)
flags |= ui::EF_SHIFT_DOWN;
if (GetKeyState(VK_CONTROL) & 0x80)
flags |= ui::EF_CONTROL_DOWN;
return flags;
}
// Convert windows message identifiers to Event types.
ui::EventType EventTypeFromNative(NativeEvent native_event) {
switch (native_event.message) {
case WM_KEYDOWN:
case WM_SYSKEYDOWN:
return ui::ET_KEY_PRESSED;
case WM_KEYUP:
case WM_SYSKEYUP:
return ui::ET_KEY_RELEASED;
case WM_LBUTTONDOWN:
case WM_MBUTTONDOWN:
case WM_NCLBUTTONDOWN:
case WM_NCMBUTTONDOWN:
case WM_NCRBUTTONDOWN:
case WM_RBUTTONDOWN:
return ui::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::ET_MOUSE_RELEASED;
case WM_MOUSEMOVE:
case WM_NCMOUSEMOVE:
return ui::ET_MOUSE_MOVED;
case WM_MOUSEWHEEL:
return ui::ET_MOUSEWHEEL;
case WM_MOUSELEAVE:
case WM_NCMOUSELEAVE:
return ui::ET_MOUSE_EXITED;
default:
NOTREACHED();
}
return ui::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 |= ui::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::EF_IS_DOUBLE_CLICK;
break;
}
// Check for pressed buttons.
if (IsClientMouseEvent(native_event)) {
if (native_event.wParam & MK_LBUTTON)
flags |= ui::EF_LEFT_BUTTON_DOWN;
if (native_event.wParam & MK_MBUTTON)
flags |= ui::EF_MIDDLE_BUTTON_DOWN;
if (native_event.wParam & MK_RBUTTON)
flags |= ui::EF_RIGHT_BUTTON_DOWN;
} else if (IsNonClientMouseEvent(native_event)) {
switch (native_event.message) {
case WM_NCLBUTTONDOWN:
flags |= ui::EF_LEFT_BUTTON_DOWN;
break;
case WM_NCMBUTTONDOWN:
flags |= ui::EF_MIDDLE_BUTTON_DOWN;
break;
case WM_NCRBUTTONDOWN:
flags |= ui::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 |= ui::EF_CONTROL_DOWN;
if (native_flags & MK_SHIFT)
flags |= ui::EF_SHIFT_DOWN;
if (GetKeyState(VK_MENU) < 0)
flags |= ui::EF_ALT_DOWN;
if (native_flags & MK_LBUTTON)
flags |= ui::EF_LEFT_BUTTON_DOWN;
if (native_flags & MK_MBUTTON)
flags |= ui::EF_MIDDLE_BUTTON_DOWN;
if (native_flags & MK_RBUTTON)
flags |= ui::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
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