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