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FWIW, I could not resist to convert Greg's example to use the new (still alpha) Fl_Grid widget rather than a normal Fl_Group - which was more meant as a test for Fl_Grid rather than to help with the original problem. However, since it works well, here's the relevant code part with Fl_Grid:
// Create a grid that we want to be inside the item
Fl_Grid *grid = new Fl_Grid(0, 0, 110, 25);
grid->layout(1, 4, 0, 0);
// X Y W H L
// - - -- -- ----
Fl_Button *b1 = new Fl_Button(0, 0, 60, 20, "B1"); b1->labelsize(8);
Fl_Button *b2 = new Fl_Button(0, 0, 30, 20, "B2"); b2->labelsize(8);
grid->end();
grid->box(FL_FRAME); // give the grid a border so we can see its edges
// Assign the buttons to the grid
// widget, R, C, Span, Alignment
grid->widget(b1, 0, 0, 1, 2, FL_ALIGN_LEFT | FL_GRID_VERTICAL);
grid->widget(b2, 0, 3, 1, 1, FL_ALIGN_RIGHT | FL_GRID_VERTICAL);
// Assign the grid (with its children) to the item
myitem->widget(grid);... and a screenshot:
![grid_in_tree]()
The full code can be viewed and tested by pulling from my development fork, branch Fl_Grid in file test/grid_in_tree.cxx. Note that this is alpha software and work in progress. Widget and cell resizing code is not yet complete. See also #256.
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