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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 "aura/event.h"
#include "base/logging.h"
#include "ui/base/keycodes/keyboard_code_conversion_win.h"
namespace aura {
namespace {
bool IsClientMouseEvent(const 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 NativeEvent& native_event) {
return native_event.message == WM_NCMOUSELEAVE ||
native_event.message == WM_NCMOUSEHOVER ||
(native_event.message >= WM_NCMOUSEMOVE &&
native_event.message <= WM_NCXBUTTONDBLCLK);
}
// 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;
}
bool IsButtonDown(NativeEvent native_event) {
return (native_event.wParam & (MK_LBUTTON | MK_MBUTTON | MK_RBUTTON |
MK_XBUTTON1 | MK_XBUTTON2)) != 0;
}
// Convert windows message identifiers to Event types.
ui::EventType EventTypeFromNative(NativeEvent native_event) {
switch (native_event.message) {
case WM_KEYDOWN:
case WM_SYSKEYDOWN:
case WM_CHAR:
return ui::ET_KEY_PRESSED;
case WM_KEYUP:
case WM_SYSKEYUP:
return ui::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_RBUTTONDBLCLK:
case WM_RBUTTONDOWN:
return ui::ET_MOUSE_PRESSED;
case WM_LBUTTONUP:
case WM_MBUTTONUP:
case WM_NCLBUTTONUP:
case WM_NCMBUTTONUP:
case WM_NCRBUTTONUP:
case WM_RBUTTONUP:
return ui::ET_MOUSE_RELEASED;
case WM_MOUSEMOVE:
return IsButtonDown(native_event) ? ui::ET_MOUSE_DRAGGED :
ui::ET_MOUSE_MOVED;
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;
}
// Get views::Event flags from a native Windows message
int EventFlagsFromNative(NativeEvent native_event) {
int flags = 0;
// 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. We need to instead put the modified button into
// a separate member on the MouseEvent, then audit all consumers of
// MouseEvents to fix them to use the resulting values correctly.
switch (native_event.message) {
case WM_LBUTTONDBLCLK:
case WM_LBUTTONDOWN:
case WM_LBUTTONUP:
case WM_NCLBUTTONDBLCLK:
case WM_NCLBUTTONDOWN:
case WM_NCLBUTTONUP:
native_event.wParam |= MK_LBUTTON;
break;
case WM_MBUTTONDBLCLK:
case WM_MBUTTONDOWN:
case WM_MBUTTONUP:
case WM_NCMBUTTONDBLCLK:
case WM_NCMBUTTONDOWN:
case WM_NCMBUTTONUP:
native_event.wParam |= MK_MBUTTON;
break;
case WM_RBUTTONDBLCLK:
case WM_RBUTTONDOWN:
case WM_RBUTTONUP:
case WM_NCRBUTTONDBLCLK:
case WM_NCRBUTTONDOWN:
case WM_NCRBUTTONUP:
native_event.wParam |= MK_RBUTTON;
break;
}
// 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;
}
// For non-client mouse message, the WPARAM value represents the hit test
// result, instead of the key state.
switch (native_event.message) {
case WM_NCLBUTTONDOWN:
case WM_NCLBUTTONUP:
flags |= ui::EF_LEFT_BUTTON_DOWN;
break;
case WM_NCMBUTTONDOWN:
case WM_NCMBUTTONUP:
flags |= ui::EF_MIDDLE_BUTTON_DOWN;
break;
case WM_NCRBUTTONDOWN:
case WM_NCRBUTTONUP:
flags |= ui::EF_RIGHT_BUTTON_DOWN;
break;
default: {
UINT win_flags = GET_KEYSTATE_WPARAM(native_event.wParam);
flags |= (win_flags & MK_CONTROL) ? ui::EF_CONTROL_DOWN : 0;
flags |= (win_flags & MK_SHIFT) ? ui::EF_SHIFT_DOWN : 0;
flags |= (GetKeyState(VK_MENU) < 0) ? ui::EF_ALT_DOWN : 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;
break;
}
}
return flags;
}
} // namespace
void Event::Init() {
ZeroMemory(&native_event_, sizeof(native_event_));
}
void Event::InitWithNativeEvent(NativeEvent native_event) {
native_event_ = native_event;
}
LocatedEvent::LocatedEvent(NativeEvent native_event)
: Event(native_event, EventTypeFromNative(native_event),
EventFlagsFromNative(native_event)),
location_(native_event.pt.x, native_event.pt.y) {
}
MouseEvent::MouseEvent(NativeEvent native_event)
: LocatedEvent(native_event) {
if (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 = location_.ToPOINT();
ScreenToClient(native_event.hwnd, &native_point);
location_ = gfx::Point(native_point);
}
}
} // namespace aura
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