Coffe break: so here's my hack at this suggestion.
Seems to work OK, tested on WinXP with mingw and fltk-1.1.x svn.
-------------------------
// implementation of the generic drag banner window
/* Standard headers */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
// FLTK headers
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Box.H>
#include <Fl/fl_draw.H>
/***********************************************************************
******/
class drag_banner : public Fl_Double_Window {
private:
int x1, y1; // click posn., used for dragging and docking
checks
int xoff, yoff; // origin used for dragging calcs
int scroll_pos; // origin for scrolled text banner
char *msg; // banner message
int len, ht, desc; // banner string dimensions
protected:
// override handle method to catch drag operations
int handle(int event);
void draw(void);
public:
// basic constructor
drag_banner(int X, int Y, int W, int H, const char *L = 0);
// text scroll method
void do_scroll(void) {scroll_pos -= 1; redraw();};
// set the banner message
void set_msg(const char *m);
};
/***********************************************************************
******/
drag_banner::drag_banner(int x, int y, int W, int h, const char *l)
: Fl_Double_Window(x, y, W, h, l){
this->box(FL_FLAT_BOX);
this->color(FL_BACKGROUND_COLOR);
this->clear_border();
scroll_pos = W / 2;
msg = NULL;
} // constructor
int drag_banner::handle(int event) {
int ret = Fl_Double_Window::handle(event);
switch (event) {
case FL_PUSH: // downclick in banner creates cursor offsets
x1 = Fl::event_x_root();
y1 = Fl::event_y_root();
xoff = x() - x1;
yoff = y() - y1;
ret = 1;
break;
case FL_DRAG: // drag the banner around the screen
position(xoff + Fl::event_x_root(), yoff +
Fl::event_y_root());
redraw();
ret = 1;
break;
case FL_RELEASE:
ret = 1;
break;
default:
break;
}
return ret;
} // drag_banner::handle
void drag_banner::draw(void){
Fl_Double_Window::draw(); // draw the base window
fl_font(FL_COURIER, 40); // set the font size
fl_color(FL_BLUE); // set the message colour
if((scroll_pos + len) < 0) scroll_pos = w();
fl_draw(msg, scroll_pos, (h() - desc));
} // draw string method
void drag_banner::set_msg(const char *m){
if(msg) free(msg);
msg = strdup(m);
// measure our string
fl_font(FL_COURIER, 40); // set the font size
len = ht = 0;
fl_measure(msg, len, ht, 0);
desc = fl_descent();
} // set message
/***********************************************************************
******/
drag_banner *banner = NULL;
/***** animation timeout callback ***********/
static void anim_timer(void*) {
banner->do_scroll();
Fl::repeat_timeout(0.03, anim_timer);
} // anim_timer
/***********************************************************************
******/
int main(int argc, char **argv) {
int screen_width = Fl::w();
int screen_height = Fl::h();
banner = new drag_banner(0, (screen_height - 50), screen_width,
50);
banner->set_msg("This is the Banner Message!");
banner->end();
banner->show(argc, argv);
/* Start a timer to run the text scrolling */
Fl::add_timeout(0.1, anim_timer);
/* Run the main event loop */
return Fl::run();
} // main
// end of file
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