forked from AuroraMiddleware/gtk
156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/* Constraints/VFL
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*
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* GtkConstraintLayout allows defining constraints using a
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* compact syntax called Visual Format Language, or VFL.
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*/
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#include <glib/gi18n.h>
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#include <gtk/gtk.h>
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G_DECLARE_FINAL_TYPE (VflGrid, vfl_grid, VFL, GRID, GtkWidget)
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struct _VflGrid
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{
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GtkWidget parent_instance;
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GtkWidget *button1, *button2;
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GtkWidget *button3;
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};
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G_DEFINE_TYPE (VflGrid, vfl_grid, GTK_TYPE_WIDGET)
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static void
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vfl_grid_dispose (GObject *object)
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{
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VflGrid *self = VFL_GRID (object);
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g_clear_pointer (&self->button1, gtk_widget_unparent);
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g_clear_pointer (&self->button2, gtk_widget_unparent);
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g_clear_pointer (&self->button3, gtk_widget_unparent);
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G_OBJECT_CLASS (vfl_grid_parent_class)->dispose (object);
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}
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static void
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vfl_grid_class_init (VflGridClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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object_class->dispose = vfl_grid_dispose;
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gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CONSTRAINT_LAYOUT);
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}
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/* Layout:
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*
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* +-----------------------------+
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* | +-----------+ +-----------+ |
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* | | Child 1 | | Child 2 | |
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* | +-----------+ +-----------+ |
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* | +-------------------------+ |
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* | | Child 3 | |
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* | +-------------------------+ |
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* +-----------------------------+
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*
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* Constraints:
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*
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* super.start = child1.start - 8
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* child1.width = child2.width
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* child1.end = child2.start - 12
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* child2.end = super.end - 8
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* super.start = child3.start - 8
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* child3.end = super.end - 8
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* super.top = child1.top - 8
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* super.top = child2.top - 8
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* child1.bottom = child3.top - 12
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* child2.bottom = child3.top - 12
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* child3.height = child1.height
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* child3.height = child2.height
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* child3.bottom = super.bottom - 8
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*
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* Visual format:
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*
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* H:|-8-[view1(==view2)-12-[view2]-8-|
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* H:|-8-[view3]-8-|
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* V:|-8-[view1]-12-[view3(==view1)]-8-|
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* V:|-8-[view2]-12-[view3(==view2)]-8-|
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*/
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static void
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build_constraints (VflGrid *self,
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GtkConstraintLayout *manager)
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{
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const char * const vfl[] = {
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"H:|-[button1(==button2)]-12-[button2]-|",
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"H:|-[button3]-|",
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"V:|-[button1]-12-[button3(==button1)]-|",
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"V:|-[button2]-12-[button3(==button2)]-|",
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};
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GError *error = NULL;
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gtk_constraint_layout_add_constraints_from_description (manager, vfl, G_N_ELEMENTS (vfl),
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8, 8,
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&error,
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"button1", self->button1,
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"button2", self->button2,
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"button3", self->button3,
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NULL);
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if (error != NULL)
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{
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g_printerr ("VFL parsing error:\n%s", error->message);
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g_error_free (error);
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}
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}
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static void
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vfl_grid_init (VflGrid *self)
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{
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GtkWidget *widget = GTK_WIDGET (self);
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self->button1 = gtk_button_new_with_label ("Child 1");
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gtk_widget_set_parent (self->button1, widget);
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gtk_widget_set_name (self->button1, "button1");
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self->button2 = gtk_button_new_with_label ("Child 2");
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gtk_widget_set_parent (self->button2, widget);
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gtk_widget_set_name (self->button2, "button2");
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self->button3 = gtk_button_new_with_label ("Child 3");
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gtk_widget_set_parent (self->button3, widget);
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gtk_widget_set_name (self->button3, "button3");
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GtkLayoutManager *manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
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build_constraints (self, GTK_CONSTRAINT_LAYOUT (manager));
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}
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GtkWidget *
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do_constraints3 (GtkWidget *do_widget)
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{
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static GtkWidget *window;
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if (!window)
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{
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GtkWidget *box, *grid;
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window = gtk_window_new ();
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gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Constraints");
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g_object_add_weak_pointer (G_OBJECT (window), (gpointer *)&window);
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box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
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gtk_window_set_child (GTK_WINDOW (window), box);
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grid = g_object_new (vfl_grid_get_type (), NULL);
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gtk_widget_set_hexpand (grid, TRUE);
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gtk_widget_set_vexpand (grid, TRUE);
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gtk_box_append (GTK_BOX (box), grid);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show (window);
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else
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gtk_window_destroy (GTK_WINDOW (window));
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return window;
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}
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