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Allow the rotation slider to be dragged

This commit is contained in:
Patrick Walton 2019-02-12 12:49:35 -08:00
parent 22fe63503f
commit 398718a3c8
2 changed files with 18 additions and 1 deletions
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5
demo/src/main.rs
View File

@ -247,6 +247,11 @@ impl DemoApp {
self.camera_pitch -= yrel as f32 * MOUSELOOK_ROTATION_SPEED;
self.dirty = true;
}
Event::MouseMotion { x, y, mousestate, .. } if mousestate.left() => {
let point = Point2DI32::new(x, y).scale(self.scale_factor as i32);
ui_event = UIEvent::MouseDragged(point);
self.dirty = true;
}
Event::KeyDown { keycode: Some(Keycode::W), .. } => {
self.camera_velocity.set_z(-CAMERA_VELOCITY);
self.dirty = true;

14
demo/src/ui.rs
View File

@ -178,7 +178,7 @@ impl DemoUI {
let (widget_x, widget_y) = (ROTATE_PANEL_X + PADDING, rotate_panel_y + PADDING);
let widget_rect = RectI32::new(Point2DI32::new(widget_x, widget_y),
Point2DI32::new(SLIDER_WIDTH, SLIDER_KNOB_HEIGHT));
if let Some(position) = event.handle_mouse_down_in_rect(widget_rect) {
if let Some(position) = event.handle_mouse_down_or_dragged_in_rect(widget_rect) {
self.rotation = position.x();
}
@ -267,6 +267,7 @@ impl DemoUI {
pub enum UIEvent {
None,
MouseDown(Point2DI32),
MouseDragged(Point2DI32),
}
impl UIEvent {
@ -283,4 +284,15 @@ impl UIEvent {
}
None
}
fn handle_mouse_down_or_dragged_in_rect(&mut self, rect: RectI32) -> Option<Point2DI32> {
match *self {
UIEvent::MouseDown(point) |
UIEvent::MouseDragged(point) if rect.contains_point(point) => {
*self = UIEvent::None;
Some(point - rect.origin())
}
_ => None,
}
}
}