Alvin wrote:
> Is there a method via the API that I can use to will prevent a Fl_Input
> widget (Value_Input, etc.) from losing focus?
>
> I have a dialog box that contains a Fl_Input. The dialog box appears when a
> button is pushed on the main window.
>
> I would like the text in the Fl_Input to be selected which I do using
> position(0, size()) method.
If you call textbox->take_focus() above or below that,
it should do that.
> However, when the Fl_Input loses focus, say I click on a blank part of the
> dialog box, the selection highlight disappears. I would like to prevent
> this.
The question is what is it loosing focus too?
Fl_Window and Fl_Double_Window don't, AFAIK, take 'focus',
since they're not focus-oriented themselves.
Focus should only move to other widgets if they accept focus.
I would think ifother widgets did not accept focus (by returning 0
to FL_FOCUS events) there wouldn't be a change in focus.
I'm thinking there must be some other widget in your dialog,
visible or not, that is accepting focus besides the Fl_Input.
Perhaps you have button widgets in addition to the Fl_Input
which are taking focus. Buttons are responsive to keyboard
events (eg. using TAB and Shift-TAB or arrow keys to move
focus around)
If you make those buttons not take focus, then I suppose
Fl_Input would retain focus.. but it would disable people
from being able to use keyboard nav for your dialog.
For instance if your own button derived widget returned 0
to FL_FOCUS and FL_UNFOCUS events. There are probably other
ways.
The following code, for instance, should not loose focus
to Fl_Input because there's no other focus-oriented widget
that would accept it:
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Input.H>
int main(int argc, char** argv) {
Fl_Double_Window win(400,300,"Test");
Fl_Input in(100,10,200,25,"Text");
in.value("One two three");
in.position(0, in.size());
win.show();
return(Fl::run());
}
This should show Fl_Double_Window is not taking focus.
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