Merge pull request #325 from hecrj/feature/canvas-interaction

Canvas interactivity and Game of Life example

1 files changed, 76 insertions, 0 deletions

diff --git a/native/src/mouse/click.rs b/native/src/mouse/click.rs
new file mode 100644
index 00000000..d27bc67e
--- /dev/null
+++ b/native/src/mouse/click.rs
@@ -0,0 +1,76 @@
+//! Track mouse clicks.
+use crate::Point;
+use std::time::Instant;
+
+/// A mouse click.
+#[derive(Debug, Clone, Copy)]
+pub struct Click {
+    kind: Kind,
+    position: Point,
+    time: Instant,
+}
+
+/// The kind of mouse click.
+#[derive(Debug, Clone, Copy)]
+pub enum Kind {
+    /// A single click
+    Single,
+
+    /// A double click
+    Double,
+
+    /// A triple click
+    Triple,
+}
+
+impl Kind {
+    fn next(&self) -> Kind {
+        match self {
+            Kind::Single => Kind::Double,
+            Kind::Double => Kind::Triple,
+            Kind::Triple => Kind::Double,
+        }
+    }
+}
+
+impl Click {
+    /// Creates a new [`Click`] with the given position and previous last
+    /// [`Click`].
+    ///
+    /// [`Click`]: struct.Click.html
+    pub fn new(position: Point, previous: Option<Click>) -> Click {
+        let time = Instant::now();
+
+        let kind = if let Some(previous) = previous {
+            if previous.is_consecutive(position, time) {
+                previous.kind.next()
+            } else {
+                Kind::Single
+            }
+        } else {
+            Kind::Single
+        };
+
+        Click {
+            kind,
+            position,
+            time,
+        }
+    }
+
+    /// Returns the [`Kind`] of [`Click`].
+    ///
+    /// [`Kind`]: enum.Kind.html
+    /// [`Click`]: struct.Click.html
+    pub fn kind(&self) -> Kind {
+        self.kind
+    }
+
+    fn is_consecutive(&self, new_position: Point, time: Instant) -> bool {
+        self.position == new_position
+            && time
+                .checked_duration_since(self.time)
+                .map(|duration| duration.as_millis() <= 300)
+                .unwrap_or(false)
+    }
+}