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Simplify Interaction handling in game_of_life

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This commit is contained in:
Héctor Ramón Jiménez 2020-05-01 00:54:43 +02:00
parent ee97887409
commit 71323c51bb
1 changed files with 22 additions and 20 deletions
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42
examples/game_of_life/src/main.rs
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@ -164,7 +164,7 @@ mod grid {
#[derive(Default)]
pub struct Grid {
life: HashSet<Cell>,
interaction: Option<Interaction>,
interaction: Interaction,
cache: canvas::Cache,
translation: Vector,
}
@ -174,11 +174,6 @@ mod grid {
Populate(Cell),
}
enum Interaction {
Drawing,
Panning { translation: Vector, start: Point },
}
impl Grid {
pub fn tick(&mut self) {
use itertools::Itertools;
@ -242,7 +237,7 @@ mod grid {
cursor: Cursor,
) -> Option<Message> {
if let Event::Mouse(mouse::Event::ButtonReleased(_)) = event {
self.interaction = None;
self.interaction = Interaction::None;
}
let cursor_position = cursor.position_in(&bounds)?;
@ -258,15 +253,15 @@ mod grid {
Event::Mouse(mouse_event) => match mouse_event {
mouse::Event::ButtonPressed(button) => match button {
mouse::Button::Left => {
self.interaction = Some(Interaction::Drawing);
self.interaction = Interaction::Drawing;
populate
}
mouse::Button::Right => {
self.interaction = Some(Interaction::Panning {
self.interaction = Interaction::Panning {
translation: self.translation,
start: cursor_position,
});
};
None
}
@ -274,11 +269,8 @@ mod grid {
},
mouse::Event::CursorMoved { .. } => {
match self.interaction {
Some(Interaction::Drawing) => populate,
Some(Interaction::Panning {
translation,
start,
}) => {
Interaction::Drawing => populate,
Interaction::Panning { translation, start } => {
self.translation =
translation + (cursor_position - start);
@ -368,11 +360,9 @@ mod grid {
cursor: Cursor,
) -> mouse::Interaction {
match self.interaction {
Some(Interaction::Drawing) => mouse::Interaction::Crosshair,
Some(Interaction::Panning { .. }) => {
mouse::Interaction::Grabbing
}
None if cursor.is_over(&bounds) => {
Interaction::Drawing => mouse::Interaction::Crosshair,
Interaction::Panning { .. } => mouse::Interaction::Grabbing,
Interaction::None if cursor.is_over(&bounds) => {
mouse::Interaction::Crosshair
}
_ => mouse::Interaction::default(),
@ -425,4 +415,16 @@ mod grid {
rows.cartesian_product(columns).map(|(i, j)| Cell { i, j })
}
}
enum Interaction {
None,
Drawing,
Panning { translation: Vector, start: Point },
}
impl Default for Interaction {
fn default() -> Interaction {
Interaction::None
}
}
}