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mutter/clutter/win32/clutter-event-win32.c
Neil Roberts 1fcddb3b10 [win32] Track mouse leave messages 
Bug 1178 - No enter / leave events on actors when pointer leaves the
           stage window

This patch causes the Win32 backend to emit CLUTTER_LEAVE events when
a WM_MOUSELEAVE event is received in the same way that f505536 does
for the X11 backend.

Windows will only send WM_MOUSELEAVE events if they are previously
requested using TrackMouseEvent so this needs to be called whenever
the mouse enters the window. There is no WM_MOUSELEAVE event but we
can detect when the mouse enters because we get a WM_MOUSEMOVE event.
2009-02-16 12:46:37 +00:00

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/* Clutter.
* An OpenGL based 'interactive canvas' library.
* Authored By Matthew Allum <mallum@openedhand.com>
* Copyright (C) 2006-2007 OpenedHand
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-stage-win32.h"
#include "clutter-backend-win32.h"
#include "clutter-win32.h"
#include "../clutter-backend.h"
#include "../clutter-event.h"
#include "../clutter-private.h"
#include "../clutter-debug.h"
#include "../clutter-main.h"
#include "../clutter-keysyms.h"
#include <string.h>
#include <glib.h>
#include <windows.h>
#include <windowsx.h>
typedef struct _ClutterEventSource ClutterEventSource;
struct _ClutterEventSource
{
GSource source;
ClutterBackend *backend;
GPollFD event_poll_fd;
};
static gboolean clutter_event_prepare (GSource *source,
gint *timeout);
static gboolean clutter_event_check (GSource *source);
static gboolean clutter_event_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data);
static GSourceFuncs event_funcs = {
clutter_event_prepare,
clutter_event_check,
clutter_event_dispatch,
NULL
};
/* Special mapping for some keys that don't have a direct Unicode
value. Must be sorted by the numeric value of the Windows key
virtual key code */
static const struct
{
gushort win_sym, clutter_sym;
} clutter_win32_key_map[] =
{
{ VK_CANCEL, CLUTTER_Cancel },
{ VK_BACK, CLUTTER_BackSpace },
{ VK_TAB, CLUTTER_Tab },
{ VK_CLEAR, CLUTTER_Clear },
{ VK_RETURN, CLUTTER_Return },
{ VK_MENU, CLUTTER_Menu },
{ VK_PAUSE, CLUTTER_Pause },
{ VK_HANGUL, CLUTTER_Hangul },
{ VK_KANJI, CLUTTER_Kanji },
{ VK_ESCAPE, CLUTTER_Escape },
{ VK_SPACE, CLUTTER_space },
{ VK_PRIOR, CLUTTER_Prior },
{ VK_NEXT, CLUTTER_Next },
{ VK_END, CLUTTER_End },
{ VK_HOME, CLUTTER_Home },
{ VK_LEFT, CLUTTER_Left },
{ VK_UP, CLUTTER_Up },
{ VK_RIGHT, CLUTTER_Right },
{ VK_DOWN, CLUTTER_Down },
{ VK_SELECT, CLUTTER_Select },
{ VK_PRINT, CLUTTER_Print },
{ VK_EXECUTE, CLUTTER_Execute },
{ VK_INSERT, CLUTTER_Insert },
{ VK_DELETE, CLUTTER_Delete },
{ VK_HELP, CLUTTER_Help },
{ VK_MULTIPLY, CLUTTER_multiply },
{ VK_F1, CLUTTER_F1 },
{ VK_F2, CLUTTER_F2 },
{ VK_F3, CLUTTER_F3 },
{ VK_F4, CLUTTER_F4 },
{ VK_F5, CLUTTER_F5 },
{ VK_F6, CLUTTER_F6 },
{ VK_F7, CLUTTER_F7 },
{ VK_F8, CLUTTER_F8 },
{ VK_F9, CLUTTER_F9 },
{ VK_F10, CLUTTER_F10 },
{ VK_F11, CLUTTER_F11 },
{ VK_F12, CLUTTER_F12 },
{ VK_F13, CLUTTER_F13 },
{ VK_F14, CLUTTER_F14 },
{ VK_F15, CLUTTER_F15 },
{ VK_F16, CLUTTER_F16 },
{ VK_F17, CLUTTER_F17 },
{ VK_F18, CLUTTER_F18 },
{ VK_F19, CLUTTER_F19 },
{ VK_F20, CLUTTER_F20 },
{ VK_F21, CLUTTER_F21 },
{ VK_F22, CLUTTER_F22 },
{ VK_F23, CLUTTER_F23 },
{ VK_F24, CLUTTER_F24 },
{ VK_LSHIFT, CLUTTER_Shift_L },
{ VK_RSHIFT, CLUTTER_Shift_R },
{ VK_LCONTROL, CLUTTER_Control_L },
{ VK_RCONTROL, CLUTTER_Control_R }
};
#define CLUTTER_WIN32_KEY_MAP_SIZE (sizeof (clutter_win32_key_map) \
/ sizeof (clutter_win32_key_map[0]))
static GSource *
clutter_event_source_new (ClutterBackend *backend)
{
GSource *source = g_source_new (&event_funcs, sizeof (ClutterEventSource));
ClutterEventSource *event_source = (ClutterEventSource *) source;
event_source->backend = backend;
return source;
}
void
_clutter_backend_win32_events_init (ClutterBackend *backend)
{
ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
GSource *source;
ClutterEventSource *event_source;
source = backend_win32->event_source = clutter_event_source_new (backend);
event_source = (ClutterEventSource *) source;
g_source_set_priority (source, CLUTTER_PRIORITY_EVENTS);
event_source->event_poll_fd.fd = G_WIN32_MSG_HANDLE;
event_source->event_poll_fd.events = G_IO_IN;
g_source_add_poll (source, &event_source->event_poll_fd);
g_source_set_can_recurse (source, TRUE);
g_source_attach (source, NULL);
}
void
_clutter_backend_win32_events_uninit (ClutterBackend *backend)
{
ClutterBackendWin32 *backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
if (backend_win32->event_source)
{
CLUTTER_NOTE (EVENT, "Destroying the event source");
g_source_destroy (backend_win32->event_source);
g_source_unref (backend_win32->event_source);
backend_win32->event_source = NULL;
}
}
static gboolean
check_msg_pending ()
{
MSG msg;
return PeekMessageW (&msg, NULL, 0, 0, PM_NOREMOVE) ? TRUE : FALSE;
}
static ClutterModifierType
get_modifier_state (WPARAM wparam)
{
ClutterModifierType ret = 0;
if ((wparam & MK_SHIFT))
ret |= CLUTTER_SHIFT_MASK;
if ((wparam & MK_CONTROL))
ret |= CLUTTER_CONTROL_MASK;
if ((wparam & MK_LBUTTON))
ret |= CLUTTER_BUTTON1_MASK;
if ((wparam & MK_MBUTTON))
ret |= CLUTTER_BUTTON2_MASK;
if ((wparam & MK_RBUTTON))
ret |= CLUTTER_BUTTON3_MASK;
return ret;
}
static void
make_button_event (const MSG *msg, ClutterEvent *event,
int button, int click_count, gboolean release)
{
event->type = release ? CLUTTER_BUTTON_RELEASE : CLUTTER_BUTTON_PRESS;
event->button.time = msg->time;
event->button.x = GET_X_LPARAM (msg->lParam);
event->button.y = GET_Y_LPARAM (msg->lParam);
event->button.modifier_state = get_modifier_state (msg->wParam);
event->button.button = button;
event->button.click_count = click_count;
}
/**
* clutter_win32_disable_event_retrieval
*
* Disables retrieval of Windows messages in the main loop. Use to
* create event-less canvas.
*
* This function can only be called before calling clutter_init().
*
* Since: 0.8
*/
void
clutter_win32_disable_event_retrieval (void)
{
ClutterBackendWin32 *backend;
ClutterMainContext *clutter_context;
clutter_context = clutter_context_get_default ();
backend = CLUTTER_BACKEND_WIN32 (clutter_context->backend);
backend->no_event_retrieval = TRUE;
}
static gboolean
clutter_event_prepare (GSource *source,
gint *timeout)
{
gboolean retval;
clutter_threads_enter ();
*timeout = -1;
retval = (clutter_events_pending () || check_msg_pending ());
clutter_threads_leave ();
return retval;
}
static gboolean
clutter_event_check (GSource *source)
{
ClutterEventSource *event_source = (ClutterEventSource *) source;
gboolean retval;
clutter_threads_enter ();
if ((event_source->event_poll_fd.revents & G_IO_IN))
retval = (clutter_events_pending () || check_msg_pending ());
else
retval = FALSE;
clutter_threads_leave ();
return retval;
}
static gboolean
clutter_event_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
ClutterEvent *event;
MSG msg;
clutter_threads_enter ();
/* Process Windows messages until we've got one that translates into
the clutter event queue */
while (!clutter_events_pending () && PeekMessageW (&msg, NULL,
0, 0, PM_REMOVE))
DispatchMessageW (&msg);
/* Pop an event off the queue if any */
if ((event = clutter_event_get ()))
{
/* forward the event into clutter for emission etc. */
clutter_do_event (event);
clutter_event_free (event);
}
clutter_threads_leave ();
return TRUE;
}
static ClutterModifierType
get_key_modifier_state (const BYTE *key_states)
{
ClutterModifierType ret = 0;
if ((key_states[VK_SHIFT] & 0x80)
|| (key_states[VK_LSHIFT] & 0x80)
|| (key_states[VK_RSHIFT] & 0x80))
ret |= CLUTTER_SHIFT_MASK;
if ((key_states[VK_CONTROL] & 0x80)
|| (key_states[VK_LCONTROL] & 0x80)
|| (key_states[VK_RCONTROL] & 0x80))
ret |= CLUTTER_CONTROL_MASK;
if ((key_states[VK_MENU] & 0x80)
|| (key_states[VK_LMENU] & 0x80)
|| (key_states[VK_RMENU] & 0x80))
ret |= CLUTTER_MOD1_MASK;
if (key_states[VK_CAPITAL])
ret |= CLUTTER_LOCK_MASK;
return ret;
}
static gboolean
message_translate (ClutterBackend *backend,
ClutterEvent *event,
const MSG *msg,
gboolean *call_def_window_proc)
{
ClutterBackendWin32 *backend_win32;
ClutterStageWin32 *stage_win32;
ClutterStage *stage;
ClutterStageWindow *impl;
gboolean res;
backend_win32 = CLUTTER_BACKEND_WIN32 (backend);
/* Do further processing only on events for the stage window */
stage = clutter_win32_get_stage_from_window (msg->hwnd);
if (stage == NULL)
return FALSE;
impl = _clutter_stage_get_window (stage);
stage_win32 = CLUTTER_STAGE_WIN32 (impl);
event->any.stage = stage;
res = TRUE;
switch (msg->message)
{
case WM_SIZE:
if (!stage_win32->is_foreign_win
/* Ignore size changes resulting from the stage being
minimized - otherwise the window size will be set to
0,0 */
&& msg->wParam != SIZE_MINIMIZED)
{
WORD new_width = LOWORD (msg->lParam);
WORD new_height = HIWORD (msg->lParam);
guint old_width, old_height;
clutter_actor_get_size (CLUTTER_ACTOR (stage),
&old_width, &old_height);
if (new_width != old_width || new_height != old_height)
clutter_actor_set_size (CLUTTER_ACTOR (stage),
new_width, new_height);
}
res = FALSE;
break;
case WM_SHOWWINDOW:
if (msg->wParam)
clutter_stage_win32_map (stage_win32);
else
clutter_stage_win32_unmap (stage_win32);
res = FALSE;
break;
case WM_ACTIVATE:
if (msg->wParam == WA_INACTIVE)
{
if (stage_win32->state & CLUTTER_STAGE_STATE_ACTIVATED)
{
stage_win32->state &= ~CLUTTER_STAGE_STATE_ACTIVATED;
event->type = CLUTTER_STAGE_STATE;
event->stage_state.changed_mask = CLUTTER_STAGE_STATE_ACTIVATED;
event->stage_state.new_state = stage_win32->state;
}
else
res = FALSE;
break;
}
else
{
if (!(stage_win32->state & CLUTTER_STAGE_STATE_ACTIVATED))
{
stage_win32->state |= CLUTTER_STAGE_STATE_ACTIVATED;
event->type = CLUTTER_STAGE_STATE;
event->stage_state.changed_mask = CLUTTER_STAGE_STATE_ACTIVATED;
event->stage_state.new_state = stage_win32->state;
}
else
res = FALSE;
}
break;
case WM_PAINT:
CLUTTER_NOTE (MULTISTAGE, "expose for stage:%p, redrawing", stage);
clutter_redraw (stage);
res = FALSE;
break;
case WM_DESTROY:
CLUTTER_NOTE (EVENT, "WM_DESTROY");
event->type = CLUTTER_DESTROY_NOTIFY;
break;
case WM_CLOSE:
CLUTTER_NOTE (EVENT, "WM_CLOSE");
event->type = CLUTTER_DELETE;
/* The default window proc will destroy the window so we want to
prevent this to allow applications to optionally destroy the
window themselves */
if (call_def_window_proc)
*call_def_window_proc = FALSE;
break;
case WM_LBUTTONDOWN:
make_button_event (msg, event, 1, 1, FALSE);
break;
case WM_MBUTTONDOWN:
make_button_event (msg, event, 2, 1, FALSE);
break;
case WM_RBUTTONDOWN:
make_button_event (msg, event, 3, 1, FALSE);
break;
case WM_LBUTTONUP:
make_button_event (msg, event, 1, 1, TRUE);
break;
case WM_MBUTTONUP:
make_button_event (msg, event, 2, 1, TRUE);
break;
case WM_RBUTTONUP:
make_button_event (msg, event, 3, 1, TRUE);
break;
case WM_LBUTTONDBLCLK:
make_button_event (msg, event, 1, 2, FALSE);
break;
case WM_MBUTTONDBLCLK:
make_button_event (msg, event, 2, 2, FALSE);
break;
case WM_RBUTTONDBLCLK:
make_button_event (msg, event, 3, 2, FALSE);
break;
case WM_MOUSEWHEEL:
stage_win32->scroll_pos += (SHORT) HIWORD (msg->wParam);
event->type = CLUTTER_SCROLL;
event->scroll.time = msg->time;
event->scroll.modifier_state
= get_modifier_state (LOWORD (msg->wParam));
/* conversion to window coordinates is required */
{
POINT pt = { GET_X_LPARAM (msg->lParam), GET_Y_LPARAM (msg->lParam) };
ScreenToClient (msg->hwnd, &pt);
event->scroll.x = pt.x;
event->scroll.y = pt.y;
}
if (stage_win32->scroll_pos >= WHEEL_DELTA)
{
event->scroll.direction = CLUTTER_SCROLL_UP;
stage_win32->scroll_pos -= WHEEL_DELTA;
}
else if (stage_win32->scroll_pos <= -WHEEL_DELTA)
{
event->scroll.direction = CLUTTER_SCROLL_DOWN;
stage_win32->scroll_pos += WHEEL_DELTA;
}
else
res = FALSE;
break;
case WM_MOUSEMOVE:
event->type = CLUTTER_MOTION;
event->motion.time = msg->time;
event->motion.x = GET_X_LPARAM (msg->lParam);
event->motion.y = GET_Y_LPARAM (msg->lParam);
event->motion.modifier_state = get_modifier_state (msg->wParam);
/* We need to start tracking when the mouse leaves the stage if
we're not already */
if (!stage_win32->tracking_mouse)
{
TRACKMOUSEEVENT tmevent;
tmevent.cbSize = sizeof (tmevent);
tmevent.dwFlags = TME_LEAVE;
tmevent.hwndTrack = stage_win32->hwnd;
TrackMouseEvent (&tmevent);
stage_win32->tracking_mouse = TRUE;
}
break;
case WM_MOUSELEAVE:
event->crossing.type = CLUTTER_LEAVE;
event->crossing.time = msg->time;
event->crossing.x = msg->pt.x;
event->crossing.y = msg->pt.y;
/* When we get a leave message the mouse tracking is
automatically cancelled so we'll need to start it again when
the mouse next enters the window */
stage_win32->tracking_mouse = FALSE;
break;
case WM_KEYDOWN:
case WM_KEYUP:
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
{
int scan_code = (msg->lParam >> 16) & 0xff;
int min = 0, max = CLUTTER_WIN32_KEY_MAP_SIZE, mid;
BYTE key_states[256];
/* Get the keyboard modifier states. GetKeyboardState
conveniently gets the key state that was current when the
last keyboard message read was generated */
GetKeyboardState(key_states);
/* Binary chop to check if we have a direct mapping for this
key code */
while (min < max)
{
mid = (min + max) / 2;
if (clutter_win32_key_map[mid].win_sym == msg->wParam)
{
event->key.keyval = clutter_win32_key_map[mid].clutter_sym;
event->key.unicode_value = 0;
break;
}
else if (clutter_win32_key_map[mid].win_sym < msg->wParam)
min = mid + 1;
else
max = mid;
}
/* If we don't have a direct mapping then try getting the
unicode value of the key sym */
if (min >= max)
{
WCHAR ch;
BYTE shift_state[256];
/* Translate to a Unicode value, but only take into
account the shift key. That way Ctrl+Shift+C will
generate a capital C virtual key code with a zero
unicode value for example */
memset (shift_state, 0, 256);
shift_state[VK_SHIFT] = key_states[VK_SHIFT];
shift_state[VK_LSHIFT] = key_states[VK_LSHIFT];
shift_state[VK_RSHIFT] = key_states[VK_RSHIFT];
shift_state[VK_CAPITAL] = key_states[VK_CAPITAL];
if (ToUnicode (msg->wParam, scan_code,
shift_state, &ch, 1, 0) == 1
/* The codes in this range directly match the Latin 1
codes so we can just use the Unicode value as the
key sym */
&& ch >= 0x20 && ch <= 0xff)
event->key.keyval = ch;
else
/* Otherwise we don't know what the key means but the
application might be able to do something with the
scan code so we might as well still generate the
event */
event->key.keyval = CLUTTER_VoidSymbol;
/* Get the unicode value of the keypress again using the
full modifier state */
if (ToUnicode (msg->wParam, scan_code,
key_states, &ch, 1, 0) == 1)
event->key.unicode_value = ch;
else
event->key.unicode_value = 0;
}
event->key.type = msg->message == WM_KEYDOWN
|| msg->message == WM_SYSKEYDOWN
? CLUTTER_KEY_PRESS : CLUTTER_KEY_RELEASE;
event->key.time = msg->time;
event->key.modifier_state = get_key_modifier_state (key_states);
event->key.hardware_keycode = scan_code;
}
break;
case WM_GETMINMAXINFO:
{
MINMAXINFO *min_max_info = (MINMAXINFO *) msg->lParam;
_clutter_stage_win32_get_min_max_info (stage_win32, min_max_info);
if (call_def_window_proc)
*call_def_window_proc = FALSE;
}
break;
default:
/* ignore every other message */
res = FALSE;
break;
}
return res;
}
LRESULT CALLBACK
_clutter_stage_win32_window_proc (HWND hwnd, UINT umsg,
WPARAM wparam, LPARAM lparam)
{
ClutterStageWin32 *stage_win32
= (ClutterStageWin32 *) GetWindowLongPtrW (hwnd, 0);
gboolean call_def_window_proc = TRUE;
/* Ignore any messages before SetWindowLongPtr has been called to
set the stage */
if (stage_win32 != NULL)
{
ClutterBackendWin32 *backend_win32 = stage_win32->backend;
MSG msg;
ClutterEvent *event;
ClutterMainContext *clutter_context;
DWORD message_pos = GetMessagePos ();
clutter_context = clutter_context_get_default ();
msg.hwnd = hwnd;
msg.message = umsg;
msg.wParam = wparam;
msg.lParam = lparam;
msg.time = GetMessageTime ();
/* Neither MAKE_POINTS nor GET_[XY]_LPARAM is defined in MinGW
headers so we need to convert to a signed type explicitly */
msg.pt.x = (SHORT) LOWORD (message_pos);
msg.pt.y = (SHORT) HIWORD (message_pos);
event = clutter_event_new (CLUTTER_NOTHING);
if (message_translate (CLUTTER_BACKEND (backend_win32), event,
&msg, &call_def_window_proc))
/* push directly here to avoid copy of queue_put */
g_queue_push_head (clutter_context->events_queue, event);
else
clutter_event_free (event);
}
if (call_def_window_proc)
return DefWindowProcW (hwnd, umsg, wparam, lparam);
else
return 0;
}
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