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device: Add get_axis_value()

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We need a convenience function for extracting the value of a specific
axis type out of the array of axis values attached to events.
This commit is contained in:
Emmanuele Bassi 2011-01-18 16:55:14 +00:00
parent d805237c31
commit 333ca35cec
2 changed files with 51 additions and 0 deletions
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47
clutter/clutter-input-device.c
View File

@ -924,6 +924,9 @@ clutter_input_device_get_axis (ClutterInputDevice *device,
{
ClutterAxisInfo *info;
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device),
CLUTTER_INPUT_AXIS_IGNORE);
if (device->axes == NULL)
return CLUTTER_INPUT_AXIS_IGNORE;
@ -935,6 +938,50 @@ clutter_input_device_get_axis (ClutterInputDevice *device,
return info->axis;
}
/**
* clutter_input_device_get_axis_value:
* @device: a #ClutterInputDevice
* @axes: (array): an array of axes values, typically
* coming from clutter_event_get_axes()
* @axis: the axis to extract
* @value: (out): return location for the axis value
*
* Extracts the value of the given @axis of a #ClutterInputDevice from
* an array of axis values.
*
* Return value: %TRUE if the value was set, and %FALSE otherwise
*
* Since: 1.6
*/
gboolean
clutter_input_device_get_axis_value (ClutterInputDevice *device,
gdouble *axes,
ClutterInputAxis axis,
gdouble *value)
{
gint i;
g_return_val_if_fail (CLUTTER_IS_INPUT_DEVICE (device), FALSE);
g_return_val_if_fail (device->axes != NULL, FALSE);
for (i = 0; i < device->axes->len; i++)
{
ClutterAxisInfo *info;
info = &g_array_index (device->axes, ClutterAxisInfo, i);
if (info->axis == axis)
{
if (value)
*value = axes[i];
return TRUE;
}
}
return FALSE;
}
/**
* clutter_input_device_get_n_axes:
* @device: a #ClutterInputDevice

4
clutter/clutter-input-device.h
View File

@ -140,6 +140,10 @@ G_CONST_RETURN gchar * clutter_input_device_get_device_name (ClutterInputDev
guint clutter_input_device_get_n_axes (ClutterInputDevice *device);
ClutterInputAxis clutter_input_device_get_axis (ClutterInputDevice *device,
guint index_);
gboolean clutter_input_device_get_axis_value (ClutterInputDevice *device,
gdouble *axes,
ClutterInputAxis axis,
gdouble *value);
guint clutter_input_device_get_n_keys (ClutterInputDevice *device);
void clutter_input_device_set_key (ClutterInputDevice *device,