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mutter/clutter/win32/clutter-event-win32.c
Neil Roberts 527ad961ab clutter-event-win32: Emit multiple events for WM_MOUSEWHEEL Messages 
It's possible that a single WM_MOUSEWHEEL event can arrive with a
scroll amount greater than WHEEL_DELTA. Previously it would accumulate
these amounts but it would still only emit a single event per
message. For example, if a message arrived that is worth two
WHEEL_DELTAs then it would emit one event and leave scroll_pos as
+WHEEL_DELTA. If the wheel is then scrolled in the opposite direction
then wheel delta would end up as zero and the scroll event would get
lost.

This patch fixes it so that it always emits enough events to put
scroll_pos back to less than WHEEL_DELTA.

http://bugzilla.clutter-project.org/show_bug.cgi?id=2135
2010-06-25 11:29:07 +01:00

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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, see <http://www.gnu.org/licenses/>.
*
*
*/
#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
take_and_queue_event (ClutterEvent *event)
{
ClutterMainContext *clutter_context;
clutter_context = _clutter_context_get_default ();
/* The event is added directly to the queue instead of using
clutter_event_put so that it can avoid a copy. This takes
ownership of the event */
g_queue_push_head (clutter_context->events_queue, event);
}
static inline void
make_button_event (const MSG *msg,
ClutterStage *stage,
int button,
int click_count,
gboolean release,
ClutterInputDevice *device)
{
ClutterEvent *event = clutter_event_new (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;
event->button.device = device;
event->any.stage = stage;
take_and_queue_event (event);
}
/**
* 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;
backend = CLUTTER_BACKEND_WIN32 (clutter_get_default_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 void
message_translate (ClutterBackend *backend,
const MSG *msg,
gboolean *call_def_window_proc)
{
ClutterBackendWin32 *backend_win32;
ClutterStageWin32 *stage_win32;
ClutterDeviceManager *manager;
ClutterInputDevice *core_pointer, *core_keyboard;
ClutterStage *stage;
ClutterStageWindow *impl;
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;
impl = _clutter_stage_get_window (stage);
stage_win32 = CLUTTER_STAGE_WIN32 (impl);
manager = clutter_device_manager_get_default ();
core_pointer =
clutter_device_manager_get_core_device (manager, CLUTTER_POINTER_DEVICE);
core_keyboard =
clutter_device_manager_get_core_device (manager, CLUTTER_KEYBOARD_DEVICE);
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);
gfloat 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);
}
break;
case WM_SHOWWINDOW:
if (msg->wParam)
clutter_stage_win32_map (stage_win32);
else
clutter_stage_win32_unmap (stage_win32);
break;
case WM_ACTIVATE:
if (msg->wParam == WA_INACTIVE)
{
if (stage_win32->state & CLUTTER_STAGE_STATE_ACTIVATED)
{
ClutterEvent *event = clutter_event_new (CLUTTER_STAGE_STATE);
stage_win32->state &= ~CLUTTER_STAGE_STATE_ACTIVATED;
event->any.stage = stage;
event->stage_state.changed_mask = CLUTTER_STAGE_STATE_ACTIVATED;
event->stage_state.new_state = stage_win32->state;
take_and_queue_event (event);
}
}
else if (!(stage_win32->state & CLUTTER_STAGE_STATE_ACTIVATED))
{
ClutterEvent *event = clutter_event_new (CLUTTER_STAGE_STATE);
stage_win32->state |= CLUTTER_STAGE_STATE_ACTIVATED;
event->any.stage = stage;
event->stage_state.changed_mask = CLUTTER_STAGE_STATE_ACTIVATED;
event->stage_state.new_state = stage_win32->state;
take_and_queue_event (event);
}
break;
case WM_PAINT:
CLUTTER_NOTE (MULTISTAGE, "expose for stage:%p, redrawing", stage);
clutter_redraw (stage);
break;
case WM_DESTROY:
{
ClutterEvent *event = clutter_event_new (CLUTTER_DESTROY_NOTIFY);
CLUTTER_NOTE (EVENT, "WM_DESTROY");
event->any.stage = stage;
take_and_queue_event (event);
}
break;
case WM_CLOSE:
{
ClutterEvent *event = clutter_event_new (CLUTTER_DELETE);
CLUTTER_NOTE (EVENT, "WM_CLOSE");
event->any.stage = stage;
take_and_queue_event (event);
/* 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, stage, 1, 1, FALSE, core_pointer);
break;
case WM_MBUTTONDOWN:
make_button_event (msg, stage, 2, 1, FALSE, core_pointer);
break;
case WM_RBUTTONDOWN:
make_button_event (msg, stage, 3, 1, FALSE, core_pointer);
break;
case WM_LBUTTONUP:
make_button_event (msg, stage, 1, 1, TRUE, core_pointer);
break;
case WM_MBUTTONUP:
make_button_event (msg, stage, 2, 1, TRUE, core_pointer);
break;
case WM_RBUTTONUP:
make_button_event (msg, stage, 3, 1, TRUE, core_pointer);
break;
case WM_LBUTTONDBLCLK:
make_button_event (msg, stage, 1, 2, FALSE, core_pointer);
break;
case WM_MBUTTONDBLCLK:
make_button_event (msg, stage, 2, 2, FALSE, core_pointer);
break;
case WM_RBUTTONDBLCLK:
make_button_event (msg, stage, 3, 2, FALSE, core_pointer);
break;
case WM_MOUSEWHEEL:
stage_win32->scroll_pos += (SHORT) HIWORD (msg->wParam);
while (abs (stage_win32->scroll_pos) >= WHEEL_DELTA)
{
ClutterEvent *event = clutter_event_new (CLUTTER_SCROLL);
POINT pt;
event->scroll.time = msg->time;
event->scroll.modifier_state =
get_modifier_state (LOWORD (msg->wParam));
event->scroll.device = core_pointer;
event->any.stage = stage;
/* conversion to window coordinates is required */
pt.x = GET_X_LPARAM (msg->lParam);
pt.y = GET_Y_LPARAM (msg->lParam);
ScreenToClient (msg->hwnd, &pt);
event->scroll.x = pt.x;
event->scroll.y = pt.y;
if (stage_win32->scroll_pos > 0)
{
event->scroll.direction = CLUTTER_SCROLL_UP;
stage_win32->scroll_pos -= WHEEL_DELTA;
}
else
{
event->scroll.direction = CLUTTER_SCROLL_DOWN;
stage_win32->scroll_pos += WHEEL_DELTA;
}
take_and_queue_event (event);
}
break;
case WM_MOUSEMOVE:
{
ClutterEvent *event = clutter_event_new (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);
event->motion.device = core_pointer;
event->any.stage = stage;
/* We need to start tracking when the mouse enters 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);
/* we entered the stage */
_clutter_input_device_set_stage (event->motion.device, stage);
stage_win32->tracking_mouse = TRUE;
}
take_and_queue_event (event);
}
break;
case WM_MOUSELEAVE:
{
ClutterEvent *event = clutter_event_new (CLUTTER_LEAVE);
event->crossing.time = msg->time;
event->crossing.x = msg->pt.x;
event->crossing.y = msg->pt.y;
event->crossing.device = core_pointer;
event->any.stage = stage;
/* we left the stage */
_clutter_input_device_set_stage (event->crossing.device, NULL);
/* 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;
take_and_queue_event (event);
}
break;
case WM_KEYDOWN:
case WM_KEYUP:
case WM_SYSKEYDOWN:
case WM_SYSKEYUP:
{
ClutterEvent *event = clutter_event_new (CLUTTER_EVENT_NONE);
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;
event->key.device = core_keyboard;
event->any.stage = stage;
take_and_queue_event (event);
}
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;
case WM_SETCURSOR:
/* If the cursor is in the window's client area and the stage's
cursor should be invisible then we'll set a blank cursor
instead */
if (LOWORD (msg->lParam) == HTCLIENT && !stage_win32->is_cursor_visible)
{
if (call_def_window_proc)
*call_def_window_proc = FALSE;
_clutter_stage_win32_update_cursor (stage_win32);
}
break;
}
}
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;
DWORD message_pos = GetMessagePos ();
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);
message_translate (CLUTTER_BACKEND (backend_win32),
&msg, &call_def_window_proc);
}
if (call_def_window_proc)
return DefWindowProcW (hwnd, umsg, wparam, lparam);
else
return 0;
}
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