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/* foreign-drawing.c
* Copyright (C) 2015 Red Hat, Inc
* Author: Matthias Clasen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <gtk/gtk.h>
typedef struct {
GType type;
const gchar *name;
const gchar *class1;
const gchar *class2;
} PathElt;
static GtkStyleContext *
get_style (PathElt pelt[], gint n_elts)
{
GtkWidgetPath *path;
gint i;
GtkStyleContext *context;
path = gtk_widget_path_new ();
for (i = 0; i < n_elts; i++)
{
gtk_widget_path_append_type (path, pelt[i].type);
if (pelt[i].name)
gtk_widget_path_iter_set_object_name (path, i, pelt[i].name);
if (pelt[i].class1)
gtk_widget_path_iter_add_class (path, i, pelt[i].class1);
if (pelt[i].class2)
gtk_widget_path_iter_add_class (path, i, pelt[i].class2);
}
context = gtk_style_context_new ();
gtk_style_context_set_path (context, path);
gtk_widget_path_unref (path);
return context;
}
static void
draw_horizontal_scrollbar (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint height,
gint position,
GtkStateFlags state)
{
GtkStyleContext *scrollbar_context;
GtkStyleContext *trough_context;
GtkStyleContext *slider_context;
PathElt scrollbar_path[1] = {
{ GTK_TYPE_SCROLLBAR, "scrollbar", "horizontal", NULL },
};
PathElt trough_path[2] = {
{ GTK_TYPE_SCROLLBAR, "scrollbar", "horizontal", NULL },
{ G_TYPE_NONE, "trough", NULL, NULL }
};
PathElt slider_path[3] = {
{ GTK_TYPE_SCROLLBAR, "scrollbar", "horizontal", NULL },
{ G_TYPE_NONE, "trough", NULL, NULL },
{ G_TYPE_NONE, "slider", NULL, NULL }
};
scrollbar_context = get_style (scrollbar_path, G_N_ELEMENTS (scrollbar_path));
trough_context = get_style (trough_path, G_N_ELEMENTS (trough_path));
slider_context = get_style (slider_path, G_N_ELEMENTS (slider_path));
gtk_style_context_set_parent (slider_context, trough_context);
gtk_style_context_set_parent (trough_context, scrollbar_context);
gtk_style_context_set_state (scrollbar_context, state);
gtk_style_context_set_state (trough_context, state);
gtk_style_context_set_state (slider_context, state);
gtk_render_background (trough_context, cr, x, y, width, height);
gtk_render_frame (trough_context, cr, x, y, width, height);
gtk_render_slider (slider_context, cr, x + position, y + 1, 30, height - 2, GTK_ORIENTATION_HORIZONTAL);
g_object_unref (slider_context);
g_object_unref (trough_context);
g_object_unref (scrollbar_context);
}
static gboolean
draw_cb (GtkWidget *widget,
cairo_t *cr)
{
gint width;
width = gtk_widget_get_allocated_width (widget);
draw_horizontal_scrollbar (widget, cr, 10, 10, width - 20, 10, 30, GTK_STATE_FLAG_NORMAL);
draw_horizontal_scrollbar (widget, cr, 10, 30, width - 20, 10, 40, GTK_STATE_FLAG_PRELIGHT);
draw_horizontal_scrollbar (widget, cr, 10, 50, width - 20, 10, 50, GTK_STATE_FLAG_ACTIVE|GTK_STATE_FLAG_PRELIGHT);
return FALSE;
}
int
main (int argc, char *argv[])
{
GtkWidget *window;
GtkWidget *box;
GtkWidget *da;
gtk_init (NULL, NULL);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_app_paintable (window, TRUE);
box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 10);
gtk_container_add (GTK_CONTAINER (window), box);
da = gtk_drawing_area_new ();
gtk_widget_set_size_request (da, 200, 200);
gtk_widget_set_app_paintable (da, TRUE);
gtk_container_add (GTK_CONTAINER (box), da);
g_signal_connect (da, "draw", G_CALLBACK (draw_cb), NULL);
gtk_widget_show_all (window);
gtk_main ();
return 0;
}
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