Re: FL_PUSH in a Fl_Box

Am 18.10.07, 08:30 +0200 schrieb Kai-Uwe Behrmann:

> I tried in one of Erco's examples to catch the mouse dragging but never 
> see a FL_PUSH event in the derived handle(). 
> Can someone jump in? The code is attached.
> 
> kind regards
> Kai-Uwe Behrmann
> --
> developing for colour management 
> www.behrmann.name + www.oyranos.org + www.cinepaint.org


//!c++ `fltk-config --cflags` push.cpp `fltk-config --ldflags` -DTARGET=\"cairoWerkbank\" -o push

#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Box.H>
#include <FL/fl_draw.H>
#include <cstdio>

#define XSIZE 500
#define YSIZE 500

float delay = 1.f/24.f;

class Fl_Cairo_Box : public Fl_Box {
    unsigned char pixbuf[YSIZE][XSIZE][3];              // image buffer

    // FLTK DRAW METHOD
    void draw() {
        fl_draw_image((const uchar*)&pixbuf, 0, 0, XSIZE, YSIZE, 3, XSIZE*3);
    }

    // TIMER CALLBACK: CALLED TO UPDATE THE DRAWING
    static void DrawPicture_CB(void *userdata) {
        Fl_Cairo_Box *box = (Fl_Cairo_Box*)userdata;
        box->DrawPicture();
        Fl::repeat_timeout(delay, DrawPicture_CB, userdata);
    }

public:
    // CTOR
    Fl_Cairo_Box(int x, int y, int w, int h) : Fl_Box(x,y,w,h) {
        DrawPicture();                                  // show first drawing
        // Start timer updating
        Fl::add_timeout(delay, DrawPicture_CB, (void*)this);
    }

    // PLOT A PIXEL AS AN RGB COLOR INTO THE PIXEL BUFFER
    void PlotPixel(int x, int y, unsigned char r, unsigned char g, unsigned char b) {
        pixbuf[y][x][0] = r;
        pixbuf[y][x][1] = g;
        pixbuf[y][x][2] = b;
    }

    // MAKE A NEW PICTURE IN THE PIXEL BUFFER, SCHEDULE FLTK TO DRAW IT
    void DrawPicture() {
        static unsigned char drawcount = 0;
        for ( int x=0; x<XSIZE; x++ )
            for ( int y=0; y<XSIZE; y++ )
                PlotPixel(x, y, x+drawcount, y+drawcount, x+y+drawcount);
        ++drawcount;
        window()->redraw();
    }

    int e, ox, oy, dx, dy;
    int handle(int event) {
      e = event;
      switch(e) {
        case FL_PUSH:
          printf("FL_PUSH\n");
          ox = x() - Fl::event_x();
          oy = y() - Fl::event_y();
          return (1);
        case FL_RELEASE:
          printf("FL_RELEASE\n");
          return (1);
        case FL_DRAG:
          printf("FL_DRAG\n");
          dx = ox+Fl::event_x();
          dy = oy+Fl::event_y();
          return (1);
      }
      int ret = Fl_Box::handle(e);
      return ret;
    }
};


int
main (int argc, char *argv[])
{
  int w = XSIZE,
      h = YSIZE;

  Fl::get_system_colors();
  Fl_Double_Window *win = new Fl_Double_Window( w, h, TARGET );
    Fl_Group *g = new Fl_Group(0,h,w,100);
      Fl_Cairo_Box * cairo_box = new Fl_Cairo_Box(0,0,w,h);
      cairo_box->box(FL_FLAT_BOX);
    g->end();
    g->resizable(cairo_box);
  win->end();
  win->resizable(g);
  win->show((int)argc, (char**)argv);

  Fl::run();

  return 0;
}