Add Event::relativize

This commit is contained in:
Alexandre Bury 2017-10-11 11:13:22 -07:00
parent e07e156ad0
commit 2d703811c5

View File

@ -298,6 +298,53 @@ pub enum Event {
Exit,
}
impl Event {
/// Returns the position of the mouse, if `self` is a mouse event.
pub fn mouse_position(&self) -> Option<Vec2> {
if let Event::Mouse {
offset: _,
position,
event: _,
} = *self
{
Some(position)
} else {
None
}
}
/// Update `self` with the given offset.
///
/// If `self` is a mouse event, adds `top_left` to its offset.
/// Otherwise, do nothing.
pub fn relativize<V>(&mut self, top_left: V)
where
V: Into<Vec2>,
{
if let Event::Mouse {
ref mut offset,
position: _,
event: _,
} = *self
{
*offset = *offset + top_left;
}
}
/// Returns a cloned, relativized event.
///
/// If `self` is a mouse event, adds `top_left` to its offset.
/// Otherwise, returns a simple clone.
pub fn relativized<V>(&self, top_left: V) -> Self
where
V: Into<Vec2>,
{
let mut result = self.clone();
result.relativize(top_left);
result
}
}
impl From<char> for Event {
fn from(c: char) -> Event {
Event::Char(c)