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Add functions provided by the midend to tell a front end whether GUI

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buttons for undo and redo should currently be greyed out.

[originally from svn r9139]
This commit is contained in:
Simon Tatham
2011-04-02 15:36:30 +00:00
parent 00a313f2d6
commit 8c6c8df8f4
3 changed files with 30 additions and 0 deletions
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18
devel.but
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@ -3096,6 +3096,24 @@ The front end can expect its drawing API and/or
\cw{activate_timer()} to be called from within a call to this
function.
\H{midend-can-undo} \cw{midend_can_undo()}
\c int midend_can_undo(midend *me);
Returns \cw{TRUE} if the midend is currently in a state where the undo
operation is meaningful (i.e. at least one position exists on the undo
chain before the present one). Front ends may wish to use this to
visually activate and deactivate an undo button.
\H{midend-can-redo} \cw{midend_can_redo()}
\c int midend_can_redo(midend *me);
Returns \cw{TRUE} if the midend is currently in a state where the redo
operation is meaningful (i.e. at least one position exists on the redo
chain after the present one). Front ends may wish to use this to
visually activate and deactivate a redo button.
\H{midend-serialise} \cw{midend_serialise()}
\c void midend_serialise(midend *me,

10
midend.c
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@ -428,6 +428,16 @@ void midend_new_game(midend *me)
me->pressed_mouse_button = 0;
}
int midend_can_undo(midend *me)
{
return (me->statepos > 1);
}
int midend_can_redo(midend *me)
{
return (me->statepos < me->nstates);
}
static int midend_undo(midend *me)
{
if (me->statepos > 1) {

2
puzzles.h
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@ -253,6 +253,8 @@ char *midend_get_game_id(midend *me);
int midend_can_format_as_text_now(midend *me);
char *midend_text_format(midend *me);
char *midend_solve(midend *me);
int midend_can_undo(midend *me);
int midend_can_redo(midend *me);
void midend_supersede_game_desc(midend *me, char *desc, char *privdesc);
char *midend_rewrite_statusbar(midend *me, char *text);
void midend_serialise(midend *me,