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gtk-demo: Add a progress bar to foreigndrawing

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This is another commonly requested widget.
This commit is contained in:
Matthias Clasen 2016-01-18 23:40:38 -05:00
parent 409760babf
commit 3fea7f296e
1 changed files with 37 additions and 1 deletions
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38
demos/gtk-demo/foreigndrawing.c
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@ -6,7 +6,8 @@
*
* This demo shows how to use GtkStyleContext and the gtk_render_ APIs
* to achieve this. Note that this is a very simple, non-interactive
* example.
* example. Also note that the application is responsible for choosing
* suitable sizes for the rendered components.
*/
#include <gtk/gtk.h>
@ -271,6 +272,40 @@ draw_radio (GtkWidget *widget,
}
static void
draw_progress (GtkWidget *widget,
cairo_t *cr,
gint x,
gint y,
gint width,
gint height,
gint position)
{
GtkStyleContext *bar_context;
GtkStyleContext *trough_context;
GtkStyleContext *progress_context;
/* This information is taken from the GtkProgressBar docs, see "CSS nodes" */
const char *path[3] = {
"progressbar",
"trough",
"progress"
};
bar_context = get_style (NULL, path[0]);
trough_context = get_style (bar_context, path[1]);
progress_context = get_style (trough_context, path[2]);
gtk_render_background (trough_context, cr, x, y, width, height);
gtk_render_frame (trough_context, cr, x, y, width, height);
gtk_render_background (progress_context, cr, x, y, position, height);
gtk_render_frame (progress_context, cr, x, y, position, height);
g_object_unref (progress_context);
g_object_unref (trough_context);
g_object_unref (bar_context);
}
static gboolean
draw_cb (GtkWidget *widget,
cairo_t *cr)
@ -295,6 +330,7 @@ draw_cb (GtkWidget *widget,
draw_check (widget, cr, 40, 130, GTK_STATE_FLAG_CHECKED);
draw_radio (widget, cr, 70, 130, GTK_STATE_FLAG_NORMAL);
draw_radio (widget, cr, 100, 130, GTK_STATE_FLAG_CHECKED);
draw_progress (widget, cr, 10, 160, width - 20, 6, 50);
return FALSE;
}