20 Oct
2014
20 Oct
'14
5:40 p.m.
On Mon, Oct 20, 2014 at 12:26 PM, Philippe Coatmeur <philcm(a)gnu.org> wrote:
Now for the direct questions:
- Is it a proper NTK widget class declaration, that would expose a
value() method?
- Are those proper NTK widget class instances?
You must derive from an NTK widget in order for it to work properly. See
(pseudo)
code:
// derive from slider, to provide
// - value() : to get the current value
// - value(float newVal) : to set a new value
// - redraw() will cause the widget to get repainted at the next
opportunity.
class MyWidget : public Fl_Slider
{
public:
MyWidget( int, int, int, int, const char* ) :
Fl_Slider( ... blah blah ... )
{
// set default value:
value( 0.5 );
}
void draw()
{
// draw stuff based on value() here
line_to( 0, width * value() );
}
// note: there's no *explicit* value() function here, it's inherited from
Fl_Slider.
};
class NtkLv2UI
{
public:
NtkLv2UI()
{
wid = new MyWidget( 10, 10, 200, 25 );
}
MyWidget wid;
};
NtkLv2UI::port_event()
{
if ( portNumber == VOLUME )
{
wid->value( portValue );
wid->redraw();
}
}
Hope that clears things up somewhat, -Harry
PS: Hermann, FLTK / NTK will delete child instances when a window is
deleted. The window itself should be deleted though!
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