663 lines
17 KiB
C
663 lines
17 KiB
C
/* Touch and Drawing Tablets
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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 drawing tablets,
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* those contain additional information for the pointer other than
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* X/Y coordinates. Tablet pads events are mapped to actions, which
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* are both defined and interpreted by the application.
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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 <glib/gi18n.h>
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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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GdkDeviceTool *last_tool;
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gdouble *axes;
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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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GHashTable *pointer_info; /* GdkDevice -> AxesInfo */
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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 GtkPadActionEntry pad_actions[] = {
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{ GTK_PAD_ACTION_BUTTON, 1, -1, N_("Nuclear strike"), "pad.nuke" },
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{ GTK_PAD_ACTION_BUTTON, 2, -1, N_("Release siberian methane reserves"), "pad.heat" },
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{ GTK_PAD_ACTION_BUTTON, 3, -1, N_("Release solar flare"), "pad.fry" },
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{ GTK_PAD_ACTION_BUTTON, 4, -1, N_("De-stabilize Oort cloud"), "pad.fall" },
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{ GTK_PAD_ACTION_BUTTON, 5, -1, N_("Ignite WR-104"), "pad.burst" },
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{ GTK_PAD_ACTION_BUTTON, 6, -1, N_("Lart whoever asks about this button"), "pad.lart" },
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{ GTK_PAD_ACTION_RING, -1, -1, N_("Earth axial tilt"), "pad.tilt" },
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{ GTK_PAD_ACTION_STRIP, -1, -1, N_("Extent of weak nuclear force"), "pad.dissolve" },
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};
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static const gchar *pad_action_results[] = {
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"☢",
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"♨",
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"☼",
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"☄",
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"⚡",
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"💫",
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"◑",
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"⚛"
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};
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static guint cur_color = 0;
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static guint pad_action_timeout_id = 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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cur_color = (cur_color + 1) % G_N_ELEMENTS (colors);
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return info;
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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->pointer_info = g_hash_table_new_full (NULL, NULL, NULL,
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(GDestroyNotify) g_free);
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data->touch_info = g_hash_table_new_full (NULL, NULL, NULL,
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(GDestroyNotify) g_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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g_hash_table_destroy (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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GdkDeviceTool *tool;
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gdouble x, y;
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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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tool = gdk_event_get_device_tool (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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g_hash_table_remove (data->pointer_info, device);
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return;
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}
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if (!sequence)
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{
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info = g_hash_table_lookup (data->pointer_info, device);
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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->pointer_info, device, info);
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}
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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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info->last_source = source_device;
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if (info->last_tool != tool)
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info->last_tool = tool;
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g_clear_pointer (&info->axes, g_free);
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if (event->type == GDK_TOUCH_BEGIN ||
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event->type == GDK_TOUCH_UPDATE)
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{
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if (sequence && event->touch.emulating_pointer)
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g_hash_table_remove (data->pointer_info, device);
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}
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if (event->type == GDK_MOTION_NOTIFY)
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{
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info->axes =
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g_memdup (event->motion.axes,
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sizeof (gdouble) * gdk_device_get_n_axes (source_device));
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}
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else if (event->type == GDK_BUTTON_PRESS ||
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event->type == GDK_BUTTON_RELEASE)
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{
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info->axes =
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g_memdup (event->button.axes,
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sizeof (gdouble) * gdk_device_get_n_axes (source_device));
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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, distance, wheel, rotation, slider;
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GdkAxisFlags axes = gdk_device_get_axes (info->last_source);
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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 (!info->axes)
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{
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cairo_restore (cr);
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return;
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}
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if (axes & GDK_AXIS_FLAG_PRESSURE)
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{
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cairo_pattern_t *pattern;
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gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_PRESSURE,
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&pressure);
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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 & GDK_AXIS_FLAG_XTILT &&
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axes & GDK_AXIS_FLAG_YTILT)
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{
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gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_XTILT,
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&tilt_x);
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gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_YTILT,
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&tilt_y);
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render_arrow (cr, tilt_x * 100, tilt_y * 100, "Tilt");
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}
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if (axes & GDK_AXIS_FLAG_DISTANCE)
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{
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double dashes[] = { 5.0, 5.0 };
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cairo_text_extents_t extents;
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gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_DISTANCE,
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&distance);
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cairo_save (cr);
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cairo_move_to (cr, distance * 100, 0);
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cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
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cairo_set_dash (cr, dashes, 2, 0.0);
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cairo_arc (cr, 0, 0, distance * 100, 0, 2 * G_PI);
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cairo_stroke (cr);
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cairo_move_to (cr, 0, -distance * 100);
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cairo_text_extents (cr, "Distance", &extents);
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cairo_rel_move_to (cr, -extents.width / 2, 0);
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cairo_show_text (cr, "Distance");
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cairo_move_to (cr, 0, 0);
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cairo_restore (cr);
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}
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if (axes & GDK_AXIS_FLAG_WHEEL)
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{
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gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_WHEEL,
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&wheel);
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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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if (axes & GDK_AXIS_FLAG_ROTATION)
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{
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gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_ROTATION,
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&rotation);
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rotation *= 2 * G_PI;
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cairo_save (cr);
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cairo_rotate (cr, - G_PI / 2);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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cairo_set_line_width (cr, 5);
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cairo_new_sub_path (cr);
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cairo_arc (cr, 0, 0, 100, 0, rotation);
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cairo_stroke (cr);
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cairo_restore (cr);
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}
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if (axes & GDK_AXIS_FLAG_SLIDER)
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{
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cairo_pattern_t *pattern, *mask;
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gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_SLIDER,
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&slider);
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cairo_save (cr);
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cairo_move_to (cr, 0, -10);
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cairo_rel_line_to (cr, 0, -50);
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cairo_rel_line_to (cr, 10, 0);
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cairo_rel_line_to (cr, -5, 50);
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cairo_close_path (cr);
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cairo_clip_preserve (cr);
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pattern = cairo_pattern_create_linear (0, -10, 0, -60);
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cairo_pattern_add_color_stop_rgb (pattern, 0, 0, 1, 0);
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cairo_pattern_add_color_stop_rgb (pattern, 1, 1, 0, 0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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mask = cairo_pattern_create_linear (0, -10, 0, -60);
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cairo_pattern_add_color_stop_rgba (mask, 0, 0, 0, 0, 1);
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cairo_pattern_add_color_stop_rgba (mask, slider, 0, 0, 0, 1);
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cairo_pattern_add_color_stop_rgba (mask, slider, 0, 0, 0, 0);
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cairo_pattern_add_color_stop_rgba (mask, 1, 0, 0, 0, 0);
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cairo_mask (cr, mask);
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cairo_pattern_destroy (mask);
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cairo_set_source_rgb (cr, 0, 0, 0);
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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 const gchar *
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tool_type_to_string (GdkDeviceToolType tool_type)
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{
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switch (tool_type)
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{
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case GDK_DEVICE_TOOL_TYPE_PEN:
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return "Pen";
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case GDK_DEVICE_TOOL_TYPE_ERASER:
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return "Eraser";
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case GDK_DEVICE_TOOL_TYPE_BRUSH:
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return "Brush";
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case GDK_DEVICE_TOOL_TYPE_PENCIL:
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return "Pencil";
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case GDK_DEVICE_TOOL_TYPE_AIRBRUSH:
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return "Airbrush";
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case GDK_DEVICE_TOOL_TYPE_MOUSE:
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return "Mouse";
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case GDK_DEVICE_TOOL_TYPE_LENS:
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return "Lens cursor";
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case GDK_DEVICE_TOOL_TYPE_UNKNOWN:
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default:
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return "Unknown";
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}
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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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if (info->last_tool)
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{
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const gchar *tool_type;
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guint64 serial;
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tool_type = tool_type_to_string (gdk_device_tool_get_tool_type (info->last_tool));
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serial = gdk_device_tool_get_serial (info->last_tool);
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g_string_append_printf (string, "\nTool: %s", tool_type);
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if (serial != 0)
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g_string_append_printf (string, ", Serial: %lx", serial);
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}
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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 *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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g_hash_table_iter_init (&iter, data->pointer_info);
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while (g_hash_table_iter_next (&iter, NULL, &value))
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{
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info = value;
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draw_axes_info (cr, info, &allocation);
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}
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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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info = value;
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draw_axes_info (cr, info, &allocation);
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}
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/* Draw name, color legend and misc data */
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g_hash_table_iter_init (&iter, data->pointer_info);
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while (g_hash_table_iter_next (&iter, NULL, &value))
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{
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info = value;
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draw_device_info (widget, cr, NULL, &y, info);
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}
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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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info = value;
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draw_device_info (widget, cr, key, &y, info);
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}
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return FALSE;
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}
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static void
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update_label_text (GtkWidget *label,
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const gchar *text)
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{
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gchar *markup = NULL;
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if (text)
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|
markup = g_strdup_printf ("<span font='48.0'>%s</span>", text);
|
|
gtk_label_set_markup (GTK_LABEL (label), markup);
|
|
g_free (markup);
|
|
}
|
|
|
|
static gboolean
|
|
reset_label_text_timeout_cb (gpointer user_data)
|
|
{
|
|
GtkWidget *label = user_data;
|
|
|
|
update_label_text (label, NULL);
|
|
pad_action_timeout_id = 0;
|
|
return G_SOURCE_REMOVE;
|
|
}
|
|
|
|
static void
|
|
update_label_and_timeout (GtkWidget *label,
|
|
const gchar *text)
|
|
{
|
|
if (pad_action_timeout_id)
|
|
g_source_remove (pad_action_timeout_id);
|
|
|
|
update_label_text (label, text);
|
|
pad_action_timeout_id = g_timeout_add (200, reset_label_text_timeout_cb, label);
|
|
}
|
|
|
|
static void
|
|
on_action_activate (GSimpleAction *action,
|
|
GVariant *parameter,
|
|
gpointer user_data)
|
|
{
|
|
GtkWidget *label = user_data;
|
|
const gchar *result;
|
|
gchar *str;
|
|
|
|
result = g_object_get_data (G_OBJECT (action), "action-result");
|
|
|
|
if (!parameter)
|
|
update_label_and_timeout (label, result);
|
|
else
|
|
{
|
|
str = g_strdup_printf ("%s %.2f", result, g_variant_get_double (parameter));
|
|
update_label_and_timeout (label, str);
|
|
g_free (str);
|
|
}
|
|
}
|
|
|
|
static void
|
|
init_pad_controller (GtkWidget *window,
|
|
GtkWidget *label)
|
|
{
|
|
GtkPadController *pad_controller;
|
|
GSimpleActionGroup *action_group;
|
|
GSimpleAction *action;
|
|
gint i;
|
|
|
|
action_group = g_simple_action_group_new ();
|
|
pad_controller = gtk_pad_controller_new (GTK_WINDOW (window),
|
|
G_ACTION_GROUP (action_group),
|
|
NULL);
|
|
|
|
for (i = 0; i < G_N_ELEMENTS (pad_actions); i++)
|
|
{
|
|
if (pad_actions[i].type == GTK_PAD_ACTION_BUTTON)
|
|
{
|
|
action = g_simple_action_new (pad_actions[i].action_name, NULL);
|
|
}
|
|
else
|
|
{
|
|
action = g_simple_action_new_stateful (pad_actions[i].action_name,
|
|
G_VARIANT_TYPE_DOUBLE, NULL);
|
|
}
|
|
|
|
g_signal_connect (action, "activate",
|
|
G_CALLBACK (on_action_activate), label);
|
|
g_object_set_data (G_OBJECT (action), "action-result",
|
|
(gpointer) pad_action_results[i]);
|
|
g_action_map_add_action (G_ACTION_MAP (action_group), G_ACTION (action));
|
|
g_object_unref (action);
|
|
}
|
|
|
|
gtk_pad_controller_set_action_entries (pad_controller, pad_actions,
|
|
G_N_ELEMENTS (pad_actions));
|
|
g_object_set_data_full (G_OBJECT (window), "pad-controller",
|
|
pad_controller, g_object_unref);
|
|
|
|
g_object_unref (action_group);
|
|
}
|
|
|
|
GtkWidget *
|
|
do_event_axes (GtkWidget *toplevel)
|
|
{
|
|
static GtkWidget *window = NULL;
|
|
EventData *event_data;
|
|
GtkWidget *box, *label;
|
|
|
|
if (!window)
|
|
{
|
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
gtk_window_set_title (GTK_WINDOW (window), "Event Axes");
|
|
gtk_window_set_default_size (GTK_WINDOW (window), 400, 400);
|
|
|
|
g_signal_connect (window, "destroy",
|
|
G_CALLBACK (gtk_widget_destroyed), &window);
|
|
|
|
box = gtk_event_box_new ();
|
|
gtk_container_add (GTK_CONTAINER (window), box);
|
|
gtk_widget_set_support_multidevice (box, TRUE);
|
|
gtk_widget_add_events (box,
|
|
GDK_POINTER_MOTION_MASK |
|
|
GDK_BUTTON_PRESS_MASK |
|
|
GDK_BUTTON_RELEASE_MASK |
|
|
GDK_SMOOTH_SCROLL_MASK |
|
|
GDK_ENTER_NOTIFY_MASK |
|
|
GDK_LEAVE_NOTIFY_MASK |
|
|
GDK_TOUCH_MASK);
|
|
|
|
event_data = event_data_new ();
|
|
g_object_set_data_full (G_OBJECT (box), "gtk-demo-event-data",
|
|
event_data, (GDestroyNotify) event_data_free);
|
|
|
|
g_signal_connect (box, "event",
|
|
G_CALLBACK (event_cb), event_data);
|
|
g_signal_connect (box, "draw",
|
|
G_CALLBACK (draw_cb), event_data);
|
|
|
|
label = gtk_label_new ("");
|
|
gtk_label_set_use_markup (GTK_LABEL (label), TRUE);
|
|
gtk_container_add (GTK_CONTAINER (box), label);
|
|
|
|
init_pad_controller (window, label);
|
|
}
|
|
|
|
if (!gtk_widget_get_visible (window))
|
|
gtk_widget_show_all (window);
|
|
else
|
|
gtk_widget_destroy (window);
|
|
|
|
return window;
|
|
}
|