+#include "files.h"
+#include "tape.h"
+#include "network.h"
+
+
+#define DEBUG_EVENTS 0
+
+
+static boolean cursor_inside_playfield = FALSE;
+static boolean playfield_cursor_set = FALSE;
+static unsigned long playfield_cursor_delay = 0;
+
+
+/* event filter especially needed for SDL event filtering due to
+ delay problems with lots of mouse motion events when mouse button
+ not pressed (X11 can handle this with 'PointerMotionHintMask') */
+
+int FilterMouseMotionEvents(const Event *event)
+{
+ MotionEvent *motion;
+
+ /* non-motion events are directly passed to event handler functions */
+ if (event->type != EVENT_MOTIONNOTIFY)
+ return 1;
+
+ motion = (MotionEvent *)event;
+ cursor_inside_playfield = (motion->x >= SX && motion->x < SX + SXSIZE &&
+ motion->y >= SY && motion->y < SY + SYSIZE);
+
+ if (game_status == GAME_MODE_PLAYING && playfield_cursor_set)
+ {
+ SetMouseCursor(CURSOR_DEFAULT);
+ playfield_cursor_set = FALSE;
+ DelayReached(&playfield_cursor_delay, 0);
+ }
+
+ /* skip mouse motion events without pressed button outside level editor */
+ if (button_status == MB_RELEASED &&
+ game_status != GAME_MODE_EDITOR && game_status != GAME_MODE_PLAYING)
+ return 0;
+ else
+ return 1;
+}
+
+/* to prevent delay problems, skip mouse motion events if the very next
+ event is also a mouse motion event (and therefore effectively only
+ handling the last of a row of mouse motion events in the event queue) */
+
+boolean SkipPressedMouseMotionEvent(const Event *event)
+{
+ /* nothing to do if the current event is not a mouse motion event */
+ if (event->type != EVENT_MOTIONNOTIFY)
+ return FALSE;
+
+ /* only skip motion events with pressed button outside level editor */
+ if (button_status == MB_RELEASED ||
+ game_status == GAME_MODE_EDITOR || game_status == GAME_MODE_PLAYING)
+ return FALSE;
+
+ if (PendingEvent())
+ {
+ Event next_event;
+
+ PeekEvent(&next_event);
+
+ /* if next event is also a mouse motion event, skip the current one */
+ if (next_event.type == EVENT_MOTIONNOTIFY)
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/* this is only really needed for non-SDL targets to filter unwanted events;
+ when using SDL with properly installed event filter, this function can be
+ replaced with a simple "NextEvent()" call, but it doesn't hurt either */
+
+static boolean NextValidEvent(Event *event)
+{
+ while (PendingEvent())
+ {
+ boolean handle_this_event = FALSE;
+
+ NextEvent(event);
+
+ if (FilterMouseMotionEvents(event))
+ handle_this_event = TRUE;
+
+ if (SkipPressedMouseMotionEvent(event))
+ handle_this_event = FALSE;
+
+ if (handle_this_event)
+ return TRUE;
+ }
+
+ return FALSE;
+}