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6fd05dfe53
It is a thing in wayland, which means we leave traces from older touches when the compositor takes over touch sequences in order to handle a gesture.
420 lines
10 KiB
C
420 lines
10 KiB
C
/* Event Axes
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*
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* Demonstrates advanced handling of event information from exotic
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* input devices.
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*
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* On one hand, this snippet demonstrates management of input axes,
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* those contain additional information for the pointer other than
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* X/Y coordinates.
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*
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* Input axes are dependent on hardware devices, on linux/unix you
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* can see the device axes through xinput list <device>. Each time
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* a different hardware device is used to move the pointer, the
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* master device will be updated to match the axes it provides,
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* these changes can be tracked through GdkDevice::changed, or
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* checking gdk_event_get_source_device().
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*
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* On the other hand, this demo handles basic multitouch events,
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* each event coming from an specific touchpoint will contain a
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* GdkEventSequence that's unique for its lifetime, so multiple
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* touchpoints can be tracked.
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*/
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#include <gtk/gtk.h>
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typedef struct {
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GdkDevice *last_source;
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GHashTable *axes; /* axis label atom -> value */
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GdkRGBA color;
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gdouble x;
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gdouble y;
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} AxesInfo;
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typedef struct {
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AxesInfo *pointer_info;
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GHashTable *touch_info; /* GdkEventSequence -> AxesInfo */
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} EventData;
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const gchar *colors[] = {
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"black",
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"orchid",
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"fuchsia",
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"indigo",
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"thistle",
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"sienna",
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"azure",
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"plum",
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"lime",
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"navy",
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"maroon",
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"burlywood"
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};
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static guint cur_color = 0;
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static AxesInfo *
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axes_info_new (void)
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{
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AxesInfo *info;
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info = g_new0 (AxesInfo, 1);
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gdk_rgba_parse (&info->color, colors[cur_color]);
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info->axes = g_hash_table_new_full (NULL, NULL, NULL,
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(GDestroyNotify) g_free);
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cur_color = (cur_color + 1) % G_N_ELEMENTS (colors);
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return info;
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}
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static void
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axes_info_free (AxesInfo *info)
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{
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g_hash_table_destroy (info->axes);
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g_free (info);
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}
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static gboolean
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axes_info_lookup (AxesInfo *info,
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const gchar *axis_label,
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gdouble *value)
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{
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gdouble *val;
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GdkAtom atom;
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atom = gdk_atom_intern (axis_label, FALSE);
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if (atom == GDK_NONE)
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return FALSE;
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val = g_hash_table_lookup (info->axes, GDK_ATOM_TO_POINTER (atom));
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if (!val)
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return FALSE;
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*value = *val;
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return TRUE;
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}
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static EventData *
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event_data_new (void)
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{
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EventData *data;
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data = g_new0 (EventData, 1);
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data->touch_info = g_hash_table_new_full (NULL, NULL, NULL,
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(GDestroyNotify) axes_info_free);
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return data;
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}
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static void
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event_data_free (EventData *data)
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{
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if (data->pointer_info)
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axes_info_free (data->pointer_info);
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g_hash_table_destroy (data->touch_info);
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g_free (data);
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}
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static void
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update_axes_from_event (GdkEvent *event,
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EventData *data)
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{
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GdkDevice *device, *source_device;
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GdkEventSequence *sequence;
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gdouble x, y, value;
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GList *l, *axes;
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AxesInfo *info;
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device = gdk_event_get_device (event);
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source_device = gdk_event_get_source_device (event);
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sequence = gdk_event_get_event_sequence (event);
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if (event->type == GDK_TOUCH_END ||
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event->type == GDK_TOUCH_CANCEL)
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{
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g_hash_table_remove (data->touch_info, sequence);
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return;
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}
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else if (event->type == GDK_LEAVE_NOTIFY)
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{
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if (data->pointer_info)
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axes_info_free (data->pointer_info);
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data->pointer_info = NULL;
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return;
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}
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if (!sequence)
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{
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if (!data->pointer_info)
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data->pointer_info = axes_info_new ();
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info = data->pointer_info;
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}
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else
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{
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info = g_hash_table_lookup (data->touch_info, sequence);
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if (!info)
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{
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info = axes_info_new ();
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g_hash_table_insert (data->touch_info, sequence, info);
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}
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}
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if (info->last_source != source_device)
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{
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g_hash_table_remove_all (info->axes);
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info->last_source = source_device;
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}
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if (event->type == GDK_TOUCH_BEGIN ||
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event->type == GDK_TOUCH_UPDATE ||
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event->type == GDK_MOTION_NOTIFY ||
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event->type == GDK_BUTTON_PRESS ||
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event->type == GDK_BUTTON_RELEASE)
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{
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axes = gdk_device_list_axes (device);
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if (sequence && event->touch.emulating_pointer)
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{
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if (data->pointer_info)
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axes_info_free (data->pointer_info);
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data->pointer_info = NULL;
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}
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for (l = axes; l; l = l->next)
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{
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gdouble *ptr;
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/* All those event types are compatible wrt axes position in the struct */
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if (!gdk_device_get_axis_value (device, event->motion.axes,
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l->data, &value))
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continue;
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ptr = g_new0 (gdouble, 1);
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*ptr = value;
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g_hash_table_insert (info->axes, GDK_ATOM_TO_POINTER (l->data), ptr);
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}
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g_list_free (axes);
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}
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if (gdk_event_get_coords (event, &x, &y))
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{
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info->x = x;
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info->y = y;
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}
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}
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static gboolean
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event_cb (GtkWidget *widget,
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GdkEvent *event,
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gpointer user_data)
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{
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update_axes_from_event (event, user_data);
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gtk_widget_queue_draw (widget);
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return FALSE;
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}
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static void
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render_arrow (cairo_t *cr,
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gdouble x_diff,
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gdouble y_diff,
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const gchar *label)
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{
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cairo_save (cr);
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_new_path (cr);
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cairo_move_to (cr, 0, 0);
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cairo_line_to (cr, x_diff, y_diff);
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cairo_stroke (cr);
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cairo_move_to (cr, x_diff, y_diff);
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cairo_show_text (cr, label);
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cairo_restore (cr);
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}
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static void
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draw_axes_info (cairo_t *cr,
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AxesInfo *info,
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GtkAllocation *allocation)
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{
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gdouble pressure, tilt_x, tilt_y, wheel;
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cairo_save (cr);
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cairo_set_line_width (cr, 1);
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gdk_cairo_set_source_rgba (cr, &info->color);
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cairo_move_to (cr, 0, info->y);
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cairo_line_to (cr, allocation->width, info->y);
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cairo_move_to (cr, info->x, 0);
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cairo_line_to (cr, info->x, allocation->height);
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cairo_stroke (cr);
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cairo_translate (cr, info->x, info->y);
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if (axes_info_lookup (info, "Abs Pressure", &pressure))
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{
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cairo_pattern_t *pattern;
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pattern = cairo_pattern_create_radial (0, 0, 0, 0, 0, 100);
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cairo_pattern_add_color_stop_rgba (pattern, pressure, 1, 0, 0, pressure);
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cairo_pattern_add_color_stop_rgba (pattern, 1, 0, 0, 1, 0);
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cairo_set_source (cr, pattern);
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cairo_arc (cr, 0, 0, 100, 0, 2 * G_PI);
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cairo_fill (cr);
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cairo_pattern_destroy (pattern);
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}
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if (axes_info_lookup (info, "Abs Tilt X", &tilt_x) &&
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axes_info_lookup (info, "Abs Tilt Y", &tilt_y))
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render_arrow (cr, tilt_x * 100, tilt_y * 100, "Tilt");
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if (axes_info_lookup (info, "Abs Wheel", &wheel))
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{
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cairo_save (cr);
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cairo_set_line_width (cr, 10);
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cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
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cairo_new_sub_path (cr);
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cairo_arc (cr, 0, 0, 100, 0, wheel * 2 * G_PI);
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cairo_stroke (cr);
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cairo_restore (cr);
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}
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cairo_restore (cr);
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}
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static void
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draw_device_info (GtkWidget *widget,
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cairo_t *cr,
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GdkEventSequence *sequence,
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gint *y,
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AxesInfo *info)
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{
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PangoLayout *layout;
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GString *string;
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gint height;
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cairo_save (cr);
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string = g_string_new (NULL);
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g_string_append_printf (string, "Source: %s",
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gdk_device_get_name (info->last_source));
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if (sequence)
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g_string_append_printf (string, "\nSequence: %d",
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GPOINTER_TO_UINT (sequence));
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cairo_move_to (cr, 10, *y);
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layout = gtk_widget_create_pango_layout (widget, string->str);
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pango_cairo_show_layout (cr, layout);
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cairo_stroke (cr);
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pango_layout_get_pixel_size (layout, NULL, &height);
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gdk_cairo_set_source_rgba (cr, &info->color);
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cairo_set_line_width (cr, 10);
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cairo_move_to (cr, 0, *y);
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*y = *y + height;
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cairo_line_to (cr, 0, *y);
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cairo_stroke (cr);
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cairo_restore (cr);
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g_object_unref (layout);
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g_string_free (string, TRUE);
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}
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static gboolean
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draw_cb (GtkWidget *widget,
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cairo_t *cr,
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gpointer user_data)
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{
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EventData *data = user_data;
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GtkAllocation allocation;
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AxesInfo *touch_info;
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GHashTableIter iter;
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gpointer key, value;
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gint y = 0;
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gtk_widget_get_allocation (widget, &allocation);
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/* Draw Abs info */
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if (data->pointer_info)
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draw_axes_info (cr, data->pointer_info, &allocation);
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g_hash_table_iter_init (&iter, data->touch_info);
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while (g_hash_table_iter_next (&iter, NULL, &value))
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{
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touch_info = value;
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draw_axes_info (cr, touch_info, &allocation);
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}
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/* Draw name, color legend and misc data */
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if (data->pointer_info)
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draw_device_info (widget, cr, NULL, &y, data->pointer_info);
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g_hash_table_iter_init (&iter, data->touch_info);
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while (g_hash_table_iter_next (&iter, &key, &value))
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{
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touch_info = value;
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draw_device_info (widget, cr, key, &y, touch_info);
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}
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return FALSE;
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}
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GtkWidget *
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do_event_axes (GtkWidget *toplevel)
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{
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static GtkWidget *window = NULL;
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EventData *event_data;
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GtkWidget *box;
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if (!window)
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{
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_title (GTK_WINDOW (window), "Event Axes");
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gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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box = gtk_event_box_new ();
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gtk_container_add (GTK_CONTAINER (window), box);
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gtk_widget_add_events (box,
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GDK_POINTER_MOTION_MASK |
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GDK_BUTTON_PRESS_MASK |
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GDK_BUTTON_RELEASE_MASK |
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GDK_SMOOTH_SCROLL_MASK |
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GDK_TOUCH_MASK);
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event_data = event_data_new ();
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g_object_set_data_full (G_OBJECT (box), "gtk-demo-event-data",
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event_data, (GDestroyNotify) event_data_free);
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g_signal_connect (box, "event",
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G_CALLBACK (event_cb), event_data);
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g_signal_connect (box, "draw",
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G_CALLBACK (draw_cb), event_data);
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}
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if (!gtk_widget_get_visible (window))
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gtk_widget_show_all (window);
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else
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gtk_widget_destroy (window);
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return window;
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}
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