gtk2/demos/gtk-demo/constraints3.c
Alexander Mikhaylenko c2e4e1af73 headerbar: Remove user-settable title
Use window title, or custom title widget if it's set. Remove 'title'
property.

Update demos and tests to set the title on the window instead of
headerbar.
2020-05-01 19:48:05 +05:00

166 lines
4.8 KiB
C

/* Constraints/VFL
*
* GtkConstraintLayout allows defining constraints using a
* compact syntax called Visual Format Language, or VFL.
*/
#include <glib/gi18n.h>
#include <gtk/gtk.h>
G_DECLARE_FINAL_TYPE (VflGrid, vfl_grid, VFL, GRID, GtkWidget)
struct _VflGrid
{
GtkWidget parent_instance;
GtkWidget *button1, *button2;
GtkWidget *button3;
};
G_DEFINE_TYPE (VflGrid, vfl_grid, GTK_TYPE_WIDGET)
static void
vfl_grid_destroy (GtkWidget *widget)
{
VflGrid *self = VFL_GRID (widget);
g_clear_pointer (&self->button1, gtk_widget_destroy);
g_clear_pointer (&self->button2, gtk_widget_destroy);
g_clear_pointer (&self->button3, gtk_widget_destroy);
GTK_WIDGET_CLASS (vfl_grid_parent_class)->destroy (widget);
}
static void
vfl_grid_class_init (VflGridClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
widget_class->destroy = vfl_grid_destroy;
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_CONSTRAINT_LAYOUT);
}
/* Layout:
*
* +-----------------------------+
* | +-----------+ +-----------+ |
* | | Child 1 | | Child 2 | |
* | +-----------+ +-----------+ |
* | +-------------------------+ |
* | | Child 3 | |
* | +-------------------------+ |
* +-----------------------------+
*
* Constraints:
*
* super.start = child1.start - 8
* child1.width = child2.width
* child1.end = child2.start - 12
* child2.end = super.end - 8
* super.start = child3.start - 8
* child3.end = super.end - 8
* super.top = child1.top - 8
* super.top = child2.top - 8
* child1.bottom = child3.top - 12
* child2.bottom = child3.top - 12
* child3.height = child1.height
* child3.height = child2.height
* child3.bottom = super.bottom - 8
*
* Visual format:
*
* H:|-8-[view1(==view2)-12-[view2]-8-|
* H:|-8-[view3]-8-|
* V:|-8-[view1]-12-[view3(==view1)]-8-|
* V:|-8-[view2]-12-[view3(==view2)]-8-|
*/
static void
build_constraints (VflGrid *self,
GtkConstraintLayout *manager)
{
const char * const vfl[] = {
"H:|-[button1(==button2)]-12-[button2]-|",
"H:|-[button3]-|",
"V:|-[button1]-12-[button3(==button1)]-|",
"V:|-[button2]-12-[button3(==button2)]-|",
};
GError *error = NULL;
gtk_constraint_layout_add_constraints_from_description (manager, vfl, G_N_ELEMENTS (vfl),
8, 8,
&error,
"button1", self->button1,
"button2", self->button2,
"button3", self->button3,
NULL);
if (error != NULL)
{
g_printerr ("VFL parsing error:\n%s", error->message);
g_error_free (error);
}
}
static void
vfl_grid_init (VflGrid *self)
{
GtkWidget *widget = GTK_WIDGET (self);
self->button1 = gtk_button_new_with_label ("Child 1");
gtk_widget_set_parent (self->button1, widget);
gtk_widget_set_name (self->button1, "button1");
self->button2 = gtk_button_new_with_label ("Child 2");
gtk_widget_set_parent (self->button2, widget);
gtk_widget_set_name (self->button2, "button2");
self->button3 = gtk_button_new_with_label ("Child 3");
gtk_widget_set_parent (self->button3, widget);
gtk_widget_set_name (self->button3, "button3");
GtkLayoutManager *manager = gtk_widget_get_layout_manager (GTK_WIDGET (self));
build_constraints (self, GTK_CONSTRAINT_LAYOUT (manager));
}
GtkWidget *
do_constraints3 (GtkWidget *do_widget)
{
static GtkWidget *window;
if (!window)
{
GtkWidget *header, *box, *grid, *button;
window = gtk_window_new ();
gtk_window_set_display (GTK_WINDOW (window), gtk_widget_get_display (do_widget));
gtk_window_set_title (GTK_WINDOW (window), "Constraints");
header = gtk_header_bar_new ();
gtk_header_bar_set_show_title_buttons (GTK_HEADER_BAR (header), FALSE);
gtk_window_set_titlebar (GTK_WINDOW (window), header);
g_signal_connect (window, "destroy",
G_CALLBACK (gtk_widget_destroyed), &window);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 12);
gtk_container_add (GTK_CONTAINER (window), box);
grid = g_object_new (vfl_grid_get_type (), NULL);
gtk_widget_set_hexpand (grid, TRUE);
gtk_widget_set_vexpand (grid, TRUE);
gtk_container_add (GTK_CONTAINER (box), grid);
button = gtk_button_new_with_label ("Close");
gtk_container_add (GTK_CONTAINER (box), button);
gtk_widget_set_hexpand (grid, TRUE);
g_signal_connect_swapped (button, "clicked",
G_CALLBACK (gtk_widget_destroy), window);
}
if (!gtk_widget_get_visible (window))
gtk_widget_show (window);
else
gtk_widget_destroy (window);
return window;
}