MODULE test_constraints ;

(*
   m2-GTK4 test - GtkConstraintLayout, GtkConstraint and
   GtkConstraintGuide.  Requires a display.
*)

FROM Gio IMPORT g_application_run, g_application_quit;
FROM GtkApplication IMPORT gtk_application_new;
FROM GtkWindow IMPORT gtk_application_window_new, gtk_window_set_child,
   gtk_window_present;
FROM GtkLabel IMPORT gtk_label_new;
FROM GtkWidget IMPORT gtk_widget_set_parent, gtk_widget_set_layout_manager;
FROM M2GtkShim IMPORT m2_gtk_widget_new;
FROM GtkConstraintLayout IMPORT gtk_constraint_layout_new,
   gtk_constraint_layout_add_constraint, gtk_constraint_layout_add_guide,
   gtk_constraint_layout_remove_all_constraints;
FROM GtkConstraint IMPORT gtk_constraint_new, gtk_constraint_new_constant,
   GtkConstraintAttributeWidth, GtkConstraintAttributeHeight,
   GtkConstraintRelationEq, GtkConstraintStrengthRequired;
FROM GtkConstraintGuide IMPORT gtk_constraint_guide_new,
   gtk_constraint_guide_set_min_size, gtk_constraint_guide_get_min_size,
   gtk_constraint_guide_set_strength, gtk_constraint_guide_set_name,
   gtk_constraint_guide_get_name;
FROM GtkUtils IMPORT Connect, CStrToM2;
FROM SYSTEM IMPORT ADDRESS, ADR;
FROM libc IMPORT printf;

CONST
   AppId = "org.example.m2gtk4.TestConstraints";

VAR
   app: ADDRESS;
   passed: BOOLEAN;

PROCEDURE OnActivate (application: ADDRESS; data: ADDRESS);
VAR
   window, parent, layout, label, c1, c2, guide: ADDRESS;
   gw, gh: INTEGER;
   buf: ARRAY [0..31] OF CHAR;
   ok: BOOLEAN;
BEGIN
   ok := TRUE;

   layout := gtk_constraint_layout_new();
   IF layout = NIL THEN printf("layout NIL\n"); ok := FALSE END;

   parent := m2_gtk_widget_new(NIL, NIL, NIL);
   gtk_widget_set_layout_manager(parent, layout);
   label := gtk_label_new("constrained");
   gtk_widget_set_parent(label, parent);

   c1 := gtk_constraint_new(label, GtkConstraintAttributeWidth,
                            GtkConstraintRelationEq, NIL, 0,
                            1.0, 100.0, GtkConstraintStrengthRequired);
   IF c1 = NIL THEN printf("constraint NIL\n"); ok := FALSE END;
   gtk_constraint_layout_add_constraint(layout, c1);

   c2 := gtk_constraint_new_constant(label, GtkConstraintAttributeHeight,
                                     GtkConstraintRelationEq, 40.0,
                                     GtkConstraintStrengthRequired);
   gtk_constraint_layout_add_constraint(layout, c2);

   guide := gtk_constraint_guide_new();
   gtk_constraint_guide_set_min_size(guide, 50, 20);
   gtk_constraint_guide_get_min_size(guide, gw, gh);
   IF (gw # 50) OR (gh # 20) THEN
      printf("guide min size wrong: %d x %d\n", gw, gh); ok := FALSE
   END;
   gtk_constraint_guide_set_strength(guide, 1);
   gtk_constraint_guide_set_name(guide, "g1");
   CStrToM2(gtk_constraint_guide_get_name(guide), buf);
   IF (buf[0] # 'g') OR (buf[1] # '1') OR (buf[2] # 0C) THEN
      printf("guide name wrong: [%s]\n", buf); ok := FALSE
   END;
   gtk_constraint_layout_add_guide(layout, guide);

   window := gtk_application_window_new(application);
   gtk_window_set_child(window, parent);
   gtk_window_present(window);

   gtk_constraint_layout_remove_all_constraints(layout);

   passed := ok;
   g_application_quit(application)
END OnActivate;

VAR
   rc: INTEGER;
BEGIN
   passed := FALSE;
   app := gtk_application_new(AppId, 0);
   IF app = NIL THEN
      printf("test_constraints: FAIL (no app)\n");
      HALT(1)
   END;
   Connect(app, "activate", ADR(OnActivate), NIL);
   rc := g_application_run(app, 0, NIL);

   IF passed THEN
      printf("test_constraints: PASS\n");
      HALT(0)
   ELSE
      printf("test_constraints: FAIL\n");
      HALT(1)
   END
END test_constraints.