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I trie adding these methods: ``` int Sudoku::handle(int event) {
if (event == FL_KEYBOARD) {
int j, k;
if (Fl::event_key(FL_Home)) {
find_focus_cell(&j, &k);
printf("home %d %d\n", j, k);
return 1;
}
else if (Fl::event_key(FL_End)) {
find_focus_cell(&j, &k);
printf("end %d %d\n", j, k);
return 1;
}
else if (Fl::event_key(FL_Page_Down)) {
find_focus_cell(&j, &k);
printf("pg down %d %d\n", j, k);
return 1;
}
else if (Fl::event_key(FL_Page_Up)) {
find_focus_cell(&j, &k);
printf("pg up %d %d\n", j, k);
return 1;
}
}
return Fl_Widget::handle(event);
}
void Sudoku::find_focus_cell(int *x, int *y) {
*x = *y = -1;
auto focus_widget = Fl::focus();
if (focus_widget != nullptr) {
int j, k;
for (j = 0; j < 9; ++j) {
for (k = 0; k < 9; ++k) {
if (grid_cells_[j][k] == focus_widget) {
*x = j;
*y = k;
return;
}
}
}
}
}
```
The result is that the _only_ keyboard events that are recognized are Home, End, PageUp, PageDown: none of the normal arrow key and numbers etc., nor the menus work anymore!
Also my `find_focus_cell()` function never works; it always leaves the values at `-1`. This turns out not to be a surprise because FL_SHORTCUT only happens if Fl::focus() returns nullptr. However, to avoid this I use FL_KEYBOARD. But it still doesn't work.
So clearly I have a long way to go understanding how FLTK event-handling works!
On Monday, May 31, 2021 at 4:43:06 PM UTC+1 Albrecht Schlosser wrote:
On 5/31/21 10:15 AM 'Mark' via
fltk.general wrote:
Tucked away in fltk's test directory is a rather nice sudoku
game.
I've been trying to do some modifications. The main one
being:
```
// Show N cells...
count = (11 * (5 - difficulty_)) - 1;
```
Hmm, nice to know, but not a hard restriction, is it? The article
says "no more than
32" which is still not true for the "Medium" and "Easy" levels.
I also changed the font from Helvetica Bold to Helvetica
Roman.
Just a matter of taste, I think?
But the changes I'd really like to make are to add keyboard
support for: Home, End, PgUp, PgDown to move the focus to the
left-most cell in the current row, right-most cell in the
current row, top-most cell in the current column, and
bottom-most cell in the current column.
Could anyone give me some help with doing this please?
Interesting, this looks a little more difficult.
I think the main task is to set the Fl::focus() widget to an
arbitrary (calculated) cell, depending on the keystroke, i.e. in
class Sudoku this
would be something like
grid_cells_[i][j].take_focus();
The question is how to find the index i and j and how (in
what context) to execute the take_focus() statement. Unfortunately
the cells don't "know" their own indices, but that's probably not
necessary.
One possible approach would be to find the index by testing which
cell has the focus (Fl::focus()) and then calculate the new cell
index. This could be done in a handle() method added to the Sudoku class.
Pseudo code:
int Sudoku::handle(int e) {
switch(e) {
case FL_KEYDOWN:
case FL_SHORTCUT:
int i, j;
// 1) find the cell with focus -> i, j
// 2) calculate new cell index depending on key value
grid_cells_[i][j].take_focus();
return 1;
default:
break;
}
return Fl_Window::handle(e);
}
This is only one potential way which might work (untested) with only
a few code changes. I'm sure there are different ways...
I hope this can give you a start at least. Have fun!
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