signal callback delegate or function to connect
void callback(gdk.device_tool.DeviceTool tool, gdk.device.Device device)
tool The new current tool (optional)
device the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to ToolChanged signal.
Emitted on pen/eraser devices whenever tools enter or leave proximity.