Still not clear on what the OP actually wants, but here's my hack at
it...
This is actually pretty nasty code, so needs a lot of tidying.
Seems to work OK though... For what it is.
May be completely the wrong thing though, of course.
--------------
//
// resizeable group test
// fltk-config --compile demo.cxx
//
#include <stdio.h>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Group.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Text_Editor.H>
#include <FL/fl_draw.H>
/* XPM */
static char *grip_tile_xpm[] = {
"6 6 4 1",
" c None",
". c #FCFEFC",
"+ c #D4D6D4",
"@ c #9C9294",
".+++++",
"+...@+.++",
"+...@+",
".+++++",
"+...@+.++",
"+...@+"};
Fl_Double_Window *main_win = NULL;
Fl_Group *outer = NULL;
Fl_Group *inner = NULL;
#define TL -1
#define BR 1
class drag_btn : public Fl_Box {
private:
int x1, y1; // click posn., used for dragging checks
int corner; // which corner...
protected:
// override box draw method to do our textured dragger look
void draw();
// override handle method to catch drag operations
int handle(int event);
public:
// basic constructor
drag_btn(int x, int y, int cr);
};
drag_btn::drag_btn(int x, int y, int cr)
: Fl_Box(x, y, 10, 10) {
box(FL_THIN_DOWN_BOX);
corner = cr;
}
void drag_btn::draw() {
int xo = x();
int yo = y();
// Draw the button box
draw_box(box(), color());
// set the clip region so we only "tile" the box
fl_push_clip(xo+1, yo+1, w()-3, h()-3);
// tile the pixmap onto the button face... there must be a better way
for(int i = 2; i <= w(); i += 6)
for(int j = 2; j <= h(); j += 6)
fl_draw_pixmap(grip_tile_xpm, (xo + i), (yo + j));
fl_pop_clip();
} // draw
int drag_btn::handle(int event) {
int ret = Fl_Box::handle(event);
int dx, dy, xr, yr;
int xg, yg, wg, hg;
xr = Fl::event_x_root();
yr = Fl::event_y_root();
switch (event) {
case FL_PUSH: // downclick in button stores cursor offsets
x1 = xr;
y1 = yr;
ret = 1;
break;
case FL_DRAG: // drag the button (and its parent group) around the
screen
dx = xr - x1; dy = yr - y1;
x1 = xr; y1 = yr;
// now move the enclosing group
xg = outer->x();
yg = outer->y();
wg = outer->w();
hg = outer->h();
if(corner == TL)
outer->resize(xg+dx, yg+dy, wg-dx, hg-dy);
else if (corner == BR)
outer->resize(xg, yg, wg+dx, hg+dy);
main_win->redraw();
ret = 1;
break;
case FL_RELEASE:
ret = 1;
break;
default:
break;
}
return ret;
} // handle
int main(int argc, char **argv) {
main_win = new Fl_Double_Window(500, 500, "main");
main_win->begin();
outer = new Fl_Group(20, 20, 110, 110);
outer->begin();
drag_btn *b1 = new drag_btn(20, 20, TL);
drag_btn *b2 = new drag_btn(120, 120, BR);
inner = new Fl_Group(30, 30, 90, 90);
inner->begin();
Fl_Text_Buffer *buff = new Fl_Text_Buffer();
Fl_Text_Editor *disp = new Fl_Text_Editor(30, 30, 90, 90);
disp->buffer(buff);
inner->end();
inner->box(FL_THIN_DOWN_BOX);
inner->resizable(disp);
outer->end();
outer->box(FL_ENGRAVED_FRAME);
outer->resizable(inner);
main_win->end();
main_win->show(argc, argv);
// fill the editor with some dummy text
buff->text("line 0\nline 1\nline 2\n"
"line 3\nline 4\nline 5\n"
"line 6\nline 7\nline 8\n"
"line 9\nline 10\nline 11\n"
"line 12\nline 13\nline 14\n"
"line 15\nline 16\nline 17\n"
"line 18\nline 19\nline 20\n"
"line 21\nline 22\nline 23\n");
return Fl::run();
} // main
/* End of File */
--------------
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