mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-10 02:40:11 +00:00
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
#include <gtk/gtk.h>
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#include <math.h>
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GtkAdjustment *adjustment;
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int cursor_x, cursor_y;
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static gboolean
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event_cb (GtkWidget *window,
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GdkEvent *event)
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{
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if (gdk_event_get_event_type (event) == GDK_MOTION_NOTIFY &&
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gdk_event_get_window (event) == gtk_widget_get_window (window))
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{
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gdouble x, y;
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float processing_ms = gtk_adjustment_get_value (adjustment);
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g_usleep (processing_ms * 1000);
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gdk_event_get_coords ((GdkEvent *)event, &x, &y);
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cursor_x = x;
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cursor_y = y;
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gtk_widget_queue_draw (window);
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}
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return GDK_EVENT_PROPAGATE;
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}
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static void
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on_draw (GtkDrawingArea *da,
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cairo_t *cr,
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int width,
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int height,
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gpointer data)
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{
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_set_source_rgb (cr, 0, 0.5, 0.5);
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cairo_arc (cr, cursor_x, cursor_y, 10, 0, 2 * M_PI);
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cairo_stroke (cr);
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}
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int
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main (int argc, char **argv)
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{
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GtkWidget *window;
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GtkWidget *vbox;
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GtkWidget *label;
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GtkWidget *scale;
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GtkWidget *da;
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gtk_init ();
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_default_size (GTK_WINDOW (window), 300, 300);
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vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_container_add (GTK_CONTAINER (window), vbox);
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adjustment = gtk_adjustment_new (20, 0, 200, 1, 10, 0);
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scale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, adjustment);
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gtk_box_pack_end (GTK_BOX (vbox), scale);
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label = gtk_label_new ("Event processing time (ms):");
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gtk_widget_set_halign (label, GTK_ALIGN_CENTER);
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gtk_box_pack_end (GTK_BOX (vbox), label);
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da = gtk_drawing_area_new ();
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gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), on_draw, NULL, NULL);
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gtk_widget_set_vexpand (da, TRUE);
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gtk_box_pack_end (GTK_BOX (vbox), da);
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g_signal_connect (window, "event",
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G_CALLBACK (event_cb), NULL);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_main_quit), NULL);
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gtk_widget_show (window);
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gtk_main ();
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return 0;
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}
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