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gtk-demo: Use GdkAxisUse instead of axis labels

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Axis labels are very X specific, and are not really possible to port to other
backends such as Wayland. As such, it makes more sense to use GdkAxisUse and
GdkAxisUseFlag in order to determine the axis capabilities of a device and draw
their axes.

Signed-off-by: Stephen Chandler Paul <thatslyude@gmail.com>
This commit is contained in:
Stephen Chandler Paul 2015-02-09 19:44:50 -05:00 committed by Carlos Garnacho
parent 9e72d24b23
commit 6c2a078bf2
1 changed files with 46 additions and 62 deletions
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108
demos/gtk-demo/event_axes.c
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@ -24,7 +24,7 @@
typedef struct {
GdkDevice *last_source;
GHashTable *axes; /* axis label atom -> value */
gdouble *axes;
GdkRGBA color;
gdouble x;
gdouble y;
@ -59,8 +59,6 @@ axes_info_new (void)
info = g_new0 (AxesInfo, 1);
gdk_rgba_parse (&info->color, colors[cur_color]);
info->axes = g_hash_table_new_full (NULL, NULL, NULL,
(GDestroyNotify) g_free);
cur_color = (cur_color + 1) % G_N_ELEMENTS (colors);
@ -70,32 +68,9 @@ axes_info_new (void)
static void
axes_info_free (AxesInfo *info)
{
g_hash_table_destroy (info->axes);
g_free (info);
}
static gboolean
axes_info_lookup (AxesInfo *info,
const gchar *axis_label,
gdouble *value)
{
gdouble *val;
GdkAtom atom;
atom = gdk_atom_intern (axis_label, FALSE);
if (atom == GDK_NONE)
return FALSE;
val = g_hash_table_lookup (info->axes, GDK_ATOM_TO_POINTER (atom));
if (!val)
return FALSE;
*value = *val;
return TRUE;
}
static EventData *
event_data_new (void)
{
@ -121,13 +96,11 @@ static void
update_axes_from_event (GdkEvent *event,
EventData *data)
{
GdkDevice *device, *source_device;
GdkDevice *source_device;
GdkEventSequence *sequence;
gdouble x, y, value;
GList *l, *axes;
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);
@ -163,41 +136,32 @@ update_axes_from_event (GdkEvent *event,
}
if (info->last_source != source_device)
{
g_hash_table_remove_all (info->axes);
info->last_source = source_device;
}
info->last_source = source_device;
g_clear_pointer (&info->axes, g_free);
if (event->type == GDK_TOUCH_BEGIN ||
event->type == GDK_TOUCH_UPDATE ||
event->type == GDK_MOTION_NOTIFY ||
event->type == GDK_BUTTON_PRESS ||
event->type == GDK_BUTTON_RELEASE)
event->type == GDK_TOUCH_UPDATE)
{
axes = gdk_device_list_axes (device);
if (sequence && event->touch.emulating_pointer)
{
if (data->pointer_info)
axes_info_free (data->pointer_info);
data->pointer_info = NULL;
}
for (l = axes; l; l = l->next)
{
gdouble *ptr;
/* All those event types are compatible wrt axes position in the struct */
if (!gdk_device_get_axis_value (device, event->motion.axes,
l->data, &value))
continue;
ptr = g_new0 (gdouble, 1);
*ptr = value;
g_hash_table_insert (info->axes, GDK_ATOM_TO_POINTER (l->data), ptr);
}
g_list_free (axes);
}
if (event->type == GDK_MOTION_NOTIFY)
{
info->axes =
g_memdup (event->motion.axes,
sizeof (gdouble) * gdk_device_get_n_axes (source_device));
}
else if (event->type == GDK_BUTTON_PRESS ||
event->type == GDK_BUTTON_RELEASE)
{
info->axes =
g_memdup (event->button.axes,
sizeof (gdouble) * gdk_device_get_n_axes (source_device));
}
if (gdk_event_get_coords (event, &x, &y))
@ -243,6 +207,7 @@ draw_axes_info (cairo_t *cr,
GtkAllocation *allocation)
{
gdouble pressure, tilt_x, tilt_y, wheel;
GdkAxisFlags axes = gdk_device_get_axes (info->last_source);
cairo_save (cr);
@ -257,10 +222,19 @@ draw_axes_info (cairo_t *cr,
cairo_translate (cr, info->x, info->y);
if (axes_info_lookup (info, "Abs Pressure", &pressure))
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);
@ -273,12 +247,22 @@ draw_axes_info (cairo_t *cr,
cairo_pattern_destroy (pattern);
}
if (axes_info_lookup (info, "Abs Tilt X", &tilt_x) &&
axes_info_lookup (info, "Abs Tilt Y", &tilt_y))
render_arrow (cr, tilt_x * 100, tilt_y * 100, "Tilt");
if (axes_info_lookup (info, "Abs Wheel", &wheel))
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_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);