forked from AuroraMiddleware/gtk
a69285da08
When we have pending motion events, instead of delivering them directly, request the new FLUSH_EVENTS phase of the frame clock. This allows us to compress repeated motion events sent to the same window. In the FLUSH_EVENTS phase, which occur at priority GDK_PRIORITY_EVENTS + 1, we deliver any pending motion events then turn off event delivery until the end of the next frame. Turning off event delivery means that we'll reliably paint the compressed motion events even if more have arrived. Add a motion-compression test case which demonstrates behavior when an application takes too long handle motion events. It is unusable without this patch but behaves fine with the patch. https://bugzilla.gnome.org/show_bug.cgi?id=685460
73 lines
1.9 KiB
C
73 lines
1.9 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 void
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on_motion_notify (GtkWidget *window,
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GdkEventMotion *event)
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{
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if (event->window == gtk_widget_get_window (window))
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{
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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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cursor_x = event->x;
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cursor_y = event->y;
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gtk_widget_queue_draw (window);
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}
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}
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static void
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on_draw (GtkWidget *window,
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cairo_t *cr)
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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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gtk_init (&argc, &argv);
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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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gtk_widget_set_app_paintable (window, TRUE);
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gtk_widget_add_events (window, GDK_POINTER_MOTION_MASK);
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gtk_widget_set_app_paintable (window, TRUE);
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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, FALSE, FALSE, 0);
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label = gtk_label_new ("Event processing time (ms):");
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gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
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gtk_box_pack_end (GTK_BOX (vbox), label, FALSE, FALSE, 0);
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g_signal_connect (window, "motion-notify-event",
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G_CALLBACK (on_motion_notify), NULL);
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g_signal_connect (window, "draw",
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G_CALLBACK (on_draw), 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_all (window);
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gtk_main ();
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return 0;
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}
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