On 01/16/12 23:42, Edzard Egberts wrote:
> Greg Ercolano schrieb:
>> AFAIK, FLTK doesn't use RTTI;
>
> But most of the modern compilers use RTTI as default (and even the older
> ones can activate it) and so it works, when regarding classes, derived
> from FLTK.
Neat, thanks Edzard!
So here's a simple little example that defines different widgets
so when you push the button, it walks the window's child() array,
printing the different types of classes:
// DEMONSTRATE USING RTTI IN FLTK - erco 01/17/12
// As suggested by Edzard on fltk.general
//
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Input.H>
// SIMPLE DERIVED WIDGET
class MyClass : public Fl_Widget {
public:
MyClass(int X, int Y, int W, int H, const char*L=0) : Fl_Widget(X,Y,W,H,L)
{ }
void draw() { fl_color(FL_BLACK); fl_rectf(x(),y(),w(),h()); }
};
// CALLBACK INVOKED BY "Show" BUTTON
void ShowWidgets_CB(Fl_Widget *w, void*) {
Fl_Window *win = w->window(); // get button's parent window
for ( int i=0; i<win->children(); i++ ) { // walk all window's children
const char *classname = "?";
Fl_Widget *w = win->child(i);
// Determine the class name of each widget
if ( dynamic_cast< Fl_Button* >(w) ) { classname = "Fl_Button"; }
else if ( dynamic_cast< Fl_Box* >(w) ) { classname = "Fl_Box"; }
else if ( dynamic_cast< Fl_Input* >(w) ) { classname = "Fl_Input"; }
else if ( dynamic_cast< MyClass* >(w) ) { classname = "MyClass"; }
printf("child #%d: %s\n", i, classname);
}
}
int main() {
Fl_Double_Window win(200,200,"RTTI Test");
// Make a bunch of children
Fl_Button but(10,10,140,25,"Show"); but.callback(ShowWidgets_CB);
Fl_Input inp(10,45,140,25);
Fl_Box box(10,80,10,10); box.color(45); box.box(FL_BORDER_BOX);
MyClass my1(10,100,10,10);
MyClass my2(10,120,10,10);
win.end();
win.show();
return(Fl::run());
}
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