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/***********************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 2004 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../../LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
#include "mlvalues.h"
#include "alloc.h"
#include "libgraph.h"
#include <windows.h>
enum {
EVENT_BUTTON_DOWN = 1,
EVENT_BUTTON_UP = 2,
EVENT_KEY_PRESSED = 4,
EVENT_MOUSE_MOTION = 8
};
struct event_data {
short mouse_x, mouse_y;
unsigned char kind;
unsigned char button;
unsigned char key;
};
static struct event_data caml_gr_queue[SIZE_QUEUE];
static unsigned int caml_gr_head = 0; /* position of next read */
static unsigned int caml_gr_tail = 0; /* position of next write */
static int caml_gr_event_mask = EVENT_KEY_PRESSED;
static int last_button = 0;
static LPARAM last_pos = 0;
HANDLE caml_gr_queue_semaphore = NULL;
CRITICAL_SECTION caml_gr_queue_mutex;
void caml_gr_init_event_queue(void)
{
if (caml_gr_queue_semaphore == NULL) {
caml_gr_queue_semaphore = CreateSemaphore(NULL, 0, SIZE_QUEUE, NULL);
InitializeCriticalSection(&caml_gr_queue_mutex);
}
}
#define QueueIsEmpty (caml_gr_tail == caml_gr_head)
static void caml_gr_enqueue_event(int kind, LPARAM mouse_xy,
int button, int key)
{
struct event_data * ev;
if ((caml_gr_event_mask & kind) == 0) return;
EnterCriticalSection(&caml_gr_queue_mutex);
ev = &(caml_gr_queue[caml_gr_tail]);
ev->kind = kind;
ev->mouse_x = GET_X_LPARAM(mouse_xy);
ev->mouse_y = GET_Y_LPARAM(mouse_xy);
ev->button = (button != 0);
ev->key = key;
caml_gr_tail = (caml_gr_tail + 1) % SIZE_QUEUE;
/* If queue was full, it now appears empty;
drop oldest entry from queue. */
if (QueueIsEmpty) {
caml_gr_head = (caml_gr_head + 1) % SIZE_QUEUE;
} else {
/* One more event in queue */
ReleaseSemaphore(caml_gr_queue_semaphore, 1, NULL);
}
LeaveCriticalSection(&caml_gr_queue_mutex);
}
void caml_gr_handle_event(UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg) {
case WM_LBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_MBUTTONDOWN:
last_button = 1;
last_pos = lParam;
caml_gr_enqueue_event(EVENT_BUTTON_DOWN, lParam, 1, 0);
break;
case WM_LBUTTONUP:
case WM_RBUTTONUP:
case WM_MBUTTONUP:
last_button = 0;
last_pos = lParam;
caml_gr_enqueue_event(EVENT_BUTTON_UP, lParam, 0, 0);
break;
case WM_CHAR:
caml_gr_enqueue_event(EVENT_KEY_PRESSED, last_pos, last_button, wParam);
break;
case WM_MOUSEMOVE:
last_pos = lParam;
caml_gr_enqueue_event(EVENT_MOUSE_MOTION, lParam, last_button, 0);
break;
}
}
static value caml_gr_wait_allocate_result(int mouse_x, int mouse_y,
int button,
int keypressed, int key)
{
value res = alloc_small(5, 0);
Field(res, 0) = Val_int(mouse_x);
Field(res, 1) = Val_int(grwindow.height - 1 - mouse_y);
Field(res, 2) = Val_bool(button);
Field(res, 3) = Val_bool(keypressed);
Field(res, 4) = Val_int(key & 0xFF);
return res;
}
static value caml_gr_wait_event_poll(void)
{
int key, keypressed, i;
/* Look inside event queue for pending KeyPress events */
EnterCriticalSection(&caml_gr_queue_mutex);
key = 0;
keypressed = 0;
for (i = caml_gr_head; i != caml_gr_tail; i = (i + 1) % SIZE_QUEUE) {
if (caml_gr_queue[i].kind == EVENT_KEY_PRESSED) {
keypressed = 1;
key = caml_gr_queue[i].key;
break;
}
}
LeaveCriticalSection(&caml_gr_queue_mutex);
/* Use global vars for mouse position and buttons */
return caml_gr_wait_allocate_result(GET_X_LPARAM(last_pos),
GET_Y_LPARAM(last_pos),
last_button,
keypressed, key);
}
static value caml_gr_wait_event_blocking(int mask)
{
struct event_data ev;
/* Increase the selected events if needed */
caml_gr_event_mask |= mask;
/* Pop events from queue until one matches */
do {
/* Wait for event queue to be non-empty */
WaitForSingleObject(caml_gr_queue_semaphore, INFINITE);
/* Pop oldest event in queue */
EnterCriticalSection(&caml_gr_queue_mutex);
ev = caml_gr_queue[caml_gr_head];
/* Queue should never be empty at this point, but just in case... */
if (QueueIsEmpty) {
ev.kind = 0;
} else {
caml_gr_head = (caml_gr_head + 1) % SIZE_QUEUE;
}
LeaveCriticalSection(&caml_gr_queue_mutex);
/* Check if it matches */
} while ((ev.kind & mask) == 0);
return caml_gr_wait_allocate_result(ev.mouse_x, ev.mouse_y, ev.button,
ev.kind == EVENT_KEY_PRESSED,
ev.key);
}
CAMLprim value caml_gr_wait_event(value eventlist) /* ML */
{
int mask, poll;
gr_check_open();
mask = 0;
poll = 0;
while (eventlist != Val_int(0)) {
switch (Int_val(Field(eventlist, 0))) {
case 0: /* Button_down */
mask |= EVENT_BUTTON_DOWN; break;
case 1: /* Button_up */
mask |= EVENT_BUTTON_UP; break;
case 2: /* Key_pressed */
mask |= EVENT_KEY_PRESSED; break;
case 3: /* Mouse_motion */
mask |= EVENT_MOUSE_MOTION; break;
case 4: /* Poll */
poll = 1; break;
}
eventlist = Field(eventlist, 1);
}
if (poll)
return caml_gr_wait_event_poll();
else
return caml_gr_wait_event_blocking(mask);
}
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