launchy 0.1.0

Low-level bindings and high-level abstractions for the Novation Launchpad MIDI devices
Documentation 
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use super::*;

/// An iterator over the buttons of a given Canvas. Create an iterator by calling `.iter()` on a
/// [`Canvas`].
/// 
/// For more information, see [`Canvas::iter`].
pub struct CanvasIterator(std::vec::IntoIter<Pad>);

impl CanvasIterator {
	pub(crate) fn new<C: Canvas + ?Sized>(canvas: &C) -> Self {
		let bb_height = canvas.bounding_box_height();
		let bb_width = canvas.bounding_box_width();

		let mut coordinates = Vec::with_capacity((bb_width * bb_height) as usize);
		for y in 0..bb_height {
			for x in 0..bb_width {
				if canvas.is_valid(x, y) {
					coordinates.push(Pad { x: x as i32, y: y as i32 });
				}
			}
		}

		return CanvasIterator(coordinates.into_iter());
	}
}

impl Iterator for CanvasIterator {
	type Item = Pad;

	fn next(&mut self) -> Option<Self::Item> {
		self.0.next()
	}
}