+++ /dev/null
-/* Touch and Drawing Tablets
- *
- * Demonstrates advanced handling of event information from exotic
- * input devices.
- *
- * On one hand, this snippet demonstrates management of drawing tablets,
- * those contain additional information for the pointer other than
- * X/Y coordinates. Tablet pads events are mapped to actions, which
- * are both defined and interpreted by the application.
- *
- * Input axes are dependent on hardware devices, on linux/unix you
- * can see the device axes through xinput list <device>. Each time
- * a different hardware device is used to move the pointer, the
- * master device will be updated to match the axes it provides,
- * these changes can be tracked through GdkDevice::changed, or
- * checking gdk_event_get_source_device().
- *
- * On the other hand, this demo handles basic multitouch events,
- * each event coming from an specific touchpoint will contain a
- * GdkEventSequence that's unique for its lifetime, so multiple
- * touchpoints can be tracked.
- */
-
-#include <glib/gi18n.h>
-#include <gtk/gtk.h>
-
-typedef struct {
- GdkDevice *last_source;
- GdkDeviceTool *last_tool;
- gdouble *axes;
- GdkRGBA color;
- gdouble x;
- gdouble y;
-} AxesInfo;
-
-typedef struct {
- GHashTable *pointer_info; /* GdkDevice -> AxesInfo */
- GHashTable *touch_info; /* GdkEventSequence -> AxesInfo */
-} EventData;
-
-const gchar *colors[] = {
- "black",
- "orchid",
- "fuchsia",
- "indigo",
- "thistle",
- "sienna",
- "azure",
- "plum",
- "lime",
- "navy",
- "maroon",
- "burlywood"
-};
-
-static GtkPadActionEntry pad_actions[] = {
- { GTK_PAD_ACTION_BUTTON, 1, -1, N_("Nuclear strike"), "pad.nuke" },
- { GTK_PAD_ACTION_BUTTON, 2, -1, N_("Release siberian methane reserves"), "pad.heat" },
- { GTK_PAD_ACTION_BUTTON, 3, -1, N_("Release solar flare"), "pad.fry" },
- { GTK_PAD_ACTION_BUTTON, 4, -1, N_("De-stabilize Oort cloud"), "pad.fall" },
- { GTK_PAD_ACTION_BUTTON, 5, -1, N_("Ignite WR-104"), "pad.burst" },
- { GTK_PAD_ACTION_BUTTON, 6, -1, N_("Lart whoever asks about this button"), "pad.lart" },
- { GTK_PAD_ACTION_RING, -1, -1, N_("Earth axial tilt"), "pad.tilt" },
- { GTK_PAD_ACTION_STRIP, -1, -1, N_("Extent of weak nuclear force"), "pad.dissolve" },
-};
-
-static const gchar *pad_action_results[] = {
- "☢",
- "♨",
- "☼",
- "☄",
- "⚡",
- "💫",
- "◑",
- "⚛"
-};
-
-static guint cur_color = 0;
-static guint pad_action_timeout_id = 0;
-
-static AxesInfo *
-axes_info_new (void)
-{
- AxesInfo *info;
-
- info = g_new0 (AxesInfo, 1);
- gdk_rgba_parse (&info->color, colors[cur_color]);
-
- cur_color = (cur_color + 1) % G_N_ELEMENTS (colors);
-
- return info;
-}
-
-static EventData *
-event_data_new (void)
-{
- EventData *data;
-
- data = g_new0 (EventData, 1);
- data->pointer_info = g_hash_table_new_full (NULL, NULL, NULL,
- (GDestroyNotify) g_free);
- data->touch_info = g_hash_table_new_full (NULL, NULL, NULL,
- (GDestroyNotify) g_free);
-
- return data;
-}
-
-static void
-event_data_free (EventData *data)
-{
- g_hash_table_destroy (data->pointer_info);
- g_hash_table_destroy (data->touch_info);
- g_free (data);
-}
-
-static void
-update_axes_from_event (GdkEvent *event,
- EventData *data)
-{
- GdkDevice *device, *source_device;
- GdkEventSequence *sequence;
- GdkDeviceTool *tool;
- GdkEventType type;
- gdouble x, y;
- AxesInfo *info;
-
- device = gdk_event_get_device (event);
- source_device = gdk_event_get_source_device (event);
- sequence = gdk_event_get_event_sequence (event);
- tool = gdk_event_get_device_tool (event);
- type = gdk_event_get_event_type (event);
-
- if (type == GDK_TOUCH_END ||
- type == GDK_TOUCH_CANCEL)
- {
- g_hash_table_remove (data->touch_info, sequence);
- return;
- }
- else if (type == GDK_LEAVE_NOTIFY)
- {
- g_hash_table_remove (data->pointer_info, device);
- return;
- }
-
- if (!source_device)
- return;
-
- if (!sequence)
- {
- info = g_hash_table_lookup (data->pointer_info, device);
-
- if (!info)
- {
- info = axes_info_new ();
- g_hash_table_insert (data->pointer_info, device, info);
- }
- }
- else
- {
- info = g_hash_table_lookup (data->touch_info, sequence);
-
- if (!info)
- {
- info = axes_info_new ();
- g_hash_table_insert (data->touch_info, sequence, info);
- }
- }
-
- if (info->last_source != source_device)
- info->last_source = source_device;
-
- if (info->last_tool != tool)
- info->last_tool = tool;
-
- g_clear_pointer (&info->axes, g_free);
-
- if (type == GDK_TOUCH_BEGIN ||
- type == GDK_TOUCH_UPDATE)
- {
- gboolean emulating_pointer;
-
- gdk_event_get_touch_emulating_pointer (event, &emulating_pointer);
- if (sequence && emulating_pointer)
- g_hash_table_remove (data->pointer_info, device);
- }
- if (type == GDK_MOTION_NOTIFY ||
- type == GDK_BUTTON_PRESS ||
- type == GDK_BUTTON_RELEASE)
- {
- gdouble *axes;
- guint n_axes;
-
- gdk_event_get_axes (event, &axes, &n_axes);
- info->axes = g_memdup (axes, sizeof (double) * n_axes);
- }
-
- if (gdk_event_get_coords (event, &x, &y))
- {
- info->x = x;
- info->y = y;
- }
-}
-
-static gboolean
-event_cb (GtkWidget *widget,
- GdkEvent *event,
- gpointer user_data)
-{
- update_axes_from_event (event, user_data);
- gtk_widget_queue_draw (widget);
- return FALSE;
-}
-
-static void
-render_arrow (cairo_t *cr,
- gdouble x_diff,
- gdouble y_diff,
- const gchar *label)
-{
- cairo_save (cr);
-
- cairo_set_source_rgb (cr, 0, 0, 0);
- cairo_new_path (cr);
- cairo_move_to (cr, 0, 0);
- cairo_line_to (cr, x_diff, y_diff);
- cairo_stroke (cr);
-
- cairo_move_to (cr, x_diff, y_diff);
- cairo_show_text (cr, label);
-
- cairo_restore (cr);
-}
-
-static void
-draw_axes_info (cairo_t *cr,
- AxesInfo *info,
- int width,
- int height)
-{
- gdouble pressure, tilt_x, tilt_y, distance, wheel, rotation, slider;
- GdkAxisFlags axes = gdk_device_get_axes (info->last_source);
-
- cairo_save (cr);
-
- cairo_set_line_width (cr, 1);
- gdk_cairo_set_source_rgba (cr, &info->color);
-
- cairo_move_to (cr, 0, info->y);
- cairo_line_to (cr, width, info->y);
- cairo_move_to (cr, info->x, 0);
- cairo_line_to (cr, info->x, height);
- cairo_stroke (cr);
-
- cairo_translate (cr, info->x, info->y);
-
- if (!info->axes)
- {
- cairo_restore (cr);
- return;
- }
-
- if (axes & GDK_AXIS_FLAG_PRESSURE)
- {
- cairo_pattern_t *pattern;
-
- gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_PRESSURE,
- &pressure);
-
- pattern = cairo_pattern_create_radial (0, 0, 0, 0, 0, 100);
- cairo_pattern_add_color_stop_rgba (pattern, pressure, 1, 0, 0, pressure);
- cairo_pattern_add_color_stop_rgba (pattern, 1, 0, 0, 1, 0);
-
- cairo_set_source (cr, pattern);
-
- cairo_arc (cr, 0, 0, 100, 0, 2 * G_PI);
- cairo_fill (cr);
-
- cairo_pattern_destroy (pattern);
- }
-
- if (axes & GDK_AXIS_FLAG_XTILT &&
- axes & GDK_AXIS_FLAG_YTILT)
- {
- gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_XTILT,
- &tilt_x);
- gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_YTILT,
- &tilt_y);
-
- render_arrow (cr, tilt_x * 100, tilt_y * 100, "Tilt");
- }
-
- if (axes & GDK_AXIS_FLAG_DISTANCE)
- {
- double dashes[] = { 5.0, 5.0 };
- cairo_text_extents_t extents;
-
- gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_DISTANCE,
- &distance);
-
- cairo_save (cr);
-
- cairo_move_to (cr, distance * 100, 0);
-
- cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
- cairo_set_dash (cr, dashes, 2, 0.0);
- cairo_arc (cr, 0, 0, distance * 100, 0, 2 * G_PI);
- cairo_stroke (cr);
-
- cairo_move_to (cr, 0, -distance * 100);
- cairo_text_extents (cr, "Distance", &extents);
- cairo_rel_move_to (cr, -extents.width / 2, 0);
- cairo_show_text (cr, "Distance");
-
- cairo_move_to (cr, 0, 0);
-
- cairo_restore (cr);
- }
-
- if (axes & GDK_AXIS_FLAG_WHEEL)
- {
- gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_WHEEL,
- &wheel);
-
- cairo_save (cr);
- cairo_set_line_width (cr, 10);
- cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
-
- cairo_new_sub_path (cr);
- cairo_arc (cr, 0, 0, 100, 0, wheel * 2 * G_PI);
- cairo_stroke (cr);
- cairo_restore (cr);
- }
-
- if (axes & GDK_AXIS_FLAG_ROTATION)
- {
- gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_ROTATION,
- &rotation);
- rotation *= 2 * G_PI;
-
- cairo_save (cr);
- cairo_rotate (cr, - G_PI / 2);
- cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
- cairo_set_line_width (cr, 5);
-
- cairo_new_sub_path (cr);
- cairo_arc (cr, 0, 0, 100, 0, rotation);
- cairo_stroke (cr);
- cairo_restore (cr);
- }
-
- if (axes & GDK_AXIS_FLAG_SLIDER)
- {
- cairo_pattern_t *pattern, *mask;
-
- gdk_device_get_axis (info->last_source, info->axes, GDK_AXIS_SLIDER,
- &slider);
-
- cairo_save (cr);
-
- cairo_move_to (cr, 0, -10);
- cairo_rel_line_to (cr, 0, -50);
- cairo_rel_line_to (cr, 10, 0);
- cairo_rel_line_to (cr, -5, 50);
- cairo_close_path (cr);
-
- cairo_clip_preserve (cr);
-
- pattern = cairo_pattern_create_linear (0, -10, 0, -60);
- cairo_pattern_add_color_stop_rgb (pattern, 0, 0, 1, 0);
- cairo_pattern_add_color_stop_rgb (pattern, 1, 1, 0, 0);
- cairo_set_source (cr, pattern);
- cairo_pattern_destroy (pattern);
-
- mask = cairo_pattern_create_linear (0, -10, 0, -60);
- cairo_pattern_add_color_stop_rgba (mask, 0, 0, 0, 0, 1);
- cairo_pattern_add_color_stop_rgba (mask, slider, 0, 0, 0, 1);
- cairo_pattern_add_color_stop_rgba (mask, slider, 0, 0, 0, 0);
- cairo_pattern_add_color_stop_rgba (mask, 1, 0, 0, 0, 0);
- cairo_mask (cr, mask);
- cairo_pattern_destroy (mask);
-
- cairo_set_source_rgb (cr, 0, 0, 0);
- cairo_stroke (cr);
-
- cairo_restore (cr);
- }
-
- cairo_restore (cr);
-}
-
-static const gchar *
-tool_type_to_string (GdkDeviceToolType tool_type)
-{
- switch (tool_type)
- {
- case GDK_DEVICE_TOOL_TYPE_PEN:
- return "Pen";
- case GDK_DEVICE_TOOL_TYPE_ERASER:
- return "Eraser";
- case GDK_DEVICE_TOOL_TYPE_BRUSH:
- return "Brush";
- case GDK_DEVICE_TOOL_TYPE_PENCIL:
- return "Pencil";
- case GDK_DEVICE_TOOL_TYPE_AIRBRUSH:
- return "Airbrush";
- case GDK_DEVICE_TOOL_TYPE_MOUSE:
- return "Mouse";
- case GDK_DEVICE_TOOL_TYPE_LENS:
- return "Lens cursor";
- case GDK_DEVICE_TOOL_TYPE_UNKNOWN:
- default:
- return "Unknown";
- }
-}
-
-static void
-draw_device_info (GtkWidget *widget,
- cairo_t *cr,
- GdkEventSequence *sequence,
- gint *y,
- AxesInfo *info)
-{
- PangoLayout *layout;
- GString *string;
- gint height;
-
- cairo_save (cr);
-
- string = g_string_new (NULL);
- g_string_append_printf (string, "Source: %s",
- gdk_device_get_name (info->last_source));
-
- if (sequence)
- g_string_append_printf (string, "\nSequence: %d",
- GPOINTER_TO_UINT (sequence));
-
- if (info->last_tool)
- {
- const gchar *tool_type;
- guint64 serial;
-
- tool_type = tool_type_to_string (gdk_device_tool_get_tool_type (info->last_tool));
- serial = gdk_device_tool_get_serial (info->last_tool);
- g_string_append_printf (string, "\nTool: %s", tool_type);
-
- if (serial != 0)
- g_string_append_printf (string, ", Serial: %" G_GINT64_MODIFIER "x", serial);
- }
-
- cairo_move_to (cr, 10, *y);
- layout = gtk_widget_create_pango_layout (widget, string->str);
- pango_cairo_show_layout (cr, layout);
- cairo_stroke (cr);
-
- pango_layout_get_pixel_size (layout, NULL, &height);
-
- gdk_cairo_set_source_rgba (cr, &info->color);
- cairo_set_line_width (cr, 10);
- cairo_move_to (cr, 0, *y);
-
- *y = *y + height;
- cairo_line_to (cr, 0, *y);
- cairo_stroke (cr);
-
- cairo_restore (cr);
-
- g_object_unref (layout);
- g_string_free (string, TRUE);
-}
-
-static void
-draw_cb (GtkDrawingArea *da,
- cairo_t *cr,
- int width,
- int height,
- gpointer user_data)
-{
- GtkWidget *widget = GTK_WIDGET (da);
- EventData *data = user_data;
- AxesInfo *info;
- GHashTableIter iter;
- gpointer key, value;
- gint y = 0;
-
- /* Draw Abs info */
- g_hash_table_iter_init (&iter, data->pointer_info);
-
- while (g_hash_table_iter_next (&iter, NULL, &value))
- {
- info = value;
- draw_axes_info (cr, info, width, height);
- }
-
- g_hash_table_iter_init (&iter, data->touch_info);
-
- while (g_hash_table_iter_next (&iter, NULL, &value))
- {
- info = value;
- draw_axes_info (cr, info, width, height);
- }
-
- /* Draw name, color legend and misc data */
- g_hash_table_iter_init (&iter, data->pointer_info);
-
- while (g_hash_table_iter_next (&iter, NULL, &value))
- {
- info = value;
- draw_device_info (widget, cr, NULL, &y, info);
- }
-
- g_hash_table_iter_init (&iter, data->touch_info);
-
- while (g_hash_table_iter_next (&iter, &key, &value))
- {
- info = value;
- draw_device_info (widget, cr, key, &y, info);
- }
-}
-
-static void
-update_label_text (GtkWidget *label,
- const gchar *text)
-{
- gchar *markup = NULL;
-
- if (text)
- 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 (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));
- gtk_widget_add_controller (window, GTK_EVENT_CONTROLLER (pad_controller));
-
- g_object_unref (action_group);
-}
-
-GtkWidget *
-do_event_axes (GtkWidget *toplevel)
-{
- static GtkWidget *window = NULL;
- EventData *event_data;
- GtkWidget *label;
- GtkWidget *overlay;
- GtkWidget *da;
-
- if (!window)
- {
- window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
- gtk_window_set_title (GTK_WINDOW (window), "Touch and Drawing Tablets");
-
- g_signal_connect (window, "destroy",
- G_CALLBACK (gtk_widget_destroyed), &window);
-
- gtk_widget_set_support_multidevice (window, TRUE);
-
- event_data = event_data_new ();
- g_object_set_data_full (G_OBJECT (window), "gtk-demo-event-data",
- event_data, (GDestroyNotify) event_data_free);
-
- da = gtk_drawing_area_new ();
- gtk_drawing_area_set_content_width (GTK_DRAWING_AREA (da), 400);
- gtk_drawing_area_set_content_height (GTK_DRAWING_AREA (da), 400);
- gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), draw_cb, event_data, NULL);
- gtk_widget_set_can_focus (da, TRUE);
- gtk_widget_grab_focus (da);
-
- g_signal_connect (da, "event",
- G_CALLBACK (event_cb), event_data);
-
- label = gtk_label_new ("");
- gtk_widget_set_halign (label, GTK_ALIGN_START);
- gtk_widget_set_valign (label, GTK_ALIGN_START);
- gtk_label_set_use_markup (GTK_LABEL (label), TRUE);
-
- overlay = gtk_overlay_new ();
- gtk_container_add (GTK_CONTAINER (window), overlay);
- gtk_container_add (GTK_CONTAINER (overlay), da);
- gtk_overlay_add_overlay (GTK_OVERLAY (overlay), label);
-
- init_pad_controller (da, label);
- }
-
- if (!gtk_widget_get_visible (window))
- gtk_widget_show (window);
- else
- gtk_widget_destroy (window);
-
- return window;
-}
projects / gtk4.git / commitdiff