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Snap scrolling to major axis of movement

This is what Safari does, and it leads to much better behavior, in particular wrt overscrolling. It does cause a staircase effect when scrolling diagonally, which again Safari has, too. I don't think that bad, because it should occur very rarely in practice.

Fixes #10341
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tschneidereit committed Apr 3, 2016
1 parent 7f4929d commit 410924d94bd17dc75a4ff1c2af0ca88a94692dc4
Showing with 8 additions and 1 deletion.
  1. +8 −1 ports/glutin/
@@ -260,7 +260,14 @@ impl Window {

/// Helper function to send a scroll event.
fn scroll_window(&self, dx: f32, dy: f32, phase: TouchEventType) {
fn scroll_window(&self, mut dx: f32, mut dy: f32, phase: TouchEventType) {
// Scroll events snap to the major axis of movement, with vertical
// preferred over horizontal.
if dy.abs() >= dx.abs() {
dx = 0.0;
} else {
dy = 0.0;
let mouse_pos = self.mouse_pos.get();
let event = WindowEvent::Scroll(Point2D::typed(dx as f32, dy as f32),
Point2D::typed(mouse_pos.x as i32, mouse_pos.y as i32),

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