mirror of
git://projects.qi-hardware.com/fped.git
synced 2024-11-22 12:24:03 +02:00
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
|
/*
|
||
|
|
* gui_over.h - GUI, canvas overlays
|
||
|
|
*
|
||
|
|
* Written 2009 by Werner Almesberger
|
||
|
|
* Copyright 2009 by Werner Almesberger
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef GUI_OVER_H
|
||
|
|
#define GUI_OVER_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Dynamic changes around the pointer are affected by the following events:
|
||
|
|
*
|
||
|
|
* - enter: enter a circle where we're hovering
|
||
|
|
* - leave: leave a circle where we've been hovering
|
||
|
|
* - begin: begin dragging
|
||
|
|
* - move: move with or without dragging
|
||
|
|
* - end: end dragging
|
||
|
|
* - reset: we got a redraw, just drop everything
|
||
|
|
*
|
||
|
|
* We have the following states:
|
||
|
|
*
|
||
|
|
* - NOTHING: neither hovering nor dragging
|
||
|
|
* - HOVER: we're hovering but not dragging
|
||
|
|
* - DRAG: we're dragging but not hovering, e.g., when searching for a place to
|
||
|
|
* end the drag
|
||
|
|
* - BOTH: we're dragging and hovering
|
||
|
|
*
|
||
|
|
* Both drag and hover save the area being changed and restore it after a
|
||
|
|
* change. We have to make sure the save/draw/restore operations are properly
|
||
|
|
* sequenced. We call the hover area H, the drag area D. This is the state
|
||
|
|
* machine that does the sequencing:
|
||
|
|
*
|
||
|
|
* NOTHING (saved: -)
|
||
|
|
* enter -> save H, draw H, HOVER
|
||
|
|
* begin -> save D, draw D, DRAG
|
||
|
|
* move -> NOTHING
|
||
|
|
* reset -> NOTHING
|
||
|
|
*
|
||
|
|
* HOVER: (saved: H)
|
||
|
|
* leave -> restore H, NOTHING
|
||
|
|
* begin -> save D, draw D, BOTH
|
||
|
|
* move -> HOVER
|
||
|
|
* reset -> drop H, NOTHING
|
||
|
|
*
|
||
|
|
* DRAG: (saved: D)
|
||
|
|
* end -> restore D, NOTHING
|
||
|
|
* enter -> restore D, save H, draw H, save D, draw D, BOTH
|
||
|
|
* move -> restore D, update, save D, draw D, DRAG
|
||
|
|
* reset -> drop D, NOTHING
|
||
|
|
*
|
||
|
|
* BOTH: (saved: D on top of H)
|
||
|
|
* end -> restore D, HOVER
|
||
|
|
* leave -> restore D, restore H, save D, draw D, DRAG
|
||
|
|
* move -> restore D, update, save D, draw D, BOTH
|
||
|
|
* reset -> drop D, drop H, NOTHING
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "coord.h"
|
||
|
|
#include "inst.h"
|
||
|
|
|
||
|
|
|
||
|
|
void over_enter(struct pix_buf *(*save_and_draw)(void *user), void *user);
|
||
|
|
void over_leave(void);
|
||
|
|
|
||
|
|
void over_begin(struct pix_buf *(*save_and_draw)(void *user, struct coord pos),
|
||
|
|
void *user, struct coord pos);
|
||
|
|
void over_move(struct coord pos);
|
||
|
|
void over_end(void);
|
||
|
|
|
||
|
|
void over_reset(void);
|
||
|
|
|
||
|
|
#endif /* !GUI_OVER_H */
|