Implement Data for chrono types

Closes #1736

CHANGELOG.md

@@ -34,6 +34,7 @@ You can find its changes [documented below](#070---2021-01-01).
   context-methods to implement disabled ([#1632] by [@xarvic])
 - `LifeCycle::BuildFocusChain` to update the focus-chain ([#1632] by [@xarvic])
 - `DisabledIf` widget wrapper to disable based on the state of Data and Env ([#1702] by [@xarvic])
+- `chrono` feature with `Data` support for [chrono](https://docs.rs/chrono/) types
 ### Changed
 
 - Warn on unhandled Commands ([#1533] by [@Maan2003])

druid/Cargo.toml

@@ -64,6 +64,7 @@ fnv = "1.0.7"
 instant = { version = "0.1.6", features = ["wasm-bindgen"] }
 
 # Optional dependencies
+chrono = { version = "0.4.19", optional = true }
 im = { version = "15.0.0", optional = true }
 usvg = { version = "0.12.0", optional = true }
 

druid/src/data.rs

@@ -175,6 +175,17 @@ impl_data_simple!(std::net::IpAddr);
 impl_data_simple!(std::net::SocketAddr);
 impl_data_simple!(std::ops::RangeFull);
 impl_data_simple!(druid::piet::InterpolationMode);
+#[cfg(feature = "chrono")]
+impl_data_simple!(chrono::Duration);
+#[cfg(feature = "chrono")]
+impl_data_simple!(chrono::naive::IsoWeek);
+#[cfg(feature = "chrono")]
+impl_data_simple!(chrono::naive::NaiveDate);
+#[cfg(feature = "chrono")]
+impl_data_simple!(chrono::naive::NaiveDateTime);
+#[cfg(feature = "chrono")]
+impl_data_simple!(chrono::naive::NaiveTime);
+
 //TODO: remove me!?
 impl_data_simple!(String);
 
@@ -545,6 +556,20 @@ impl Data for ImageBuf {
     }
 }
 
+#[cfg(feature = "chrono")]
+impl<Tz: chrono::offset::TimeZone + 'static> Data for chrono::Date<Tz> {
+    fn same(&self, other: &Self) -> bool {
+        self == other
+    }
+}
+
+#[cfg(feature = "chrono")]
+impl<Tz: chrono::offset::TimeZone + 'static> Data for chrono::DateTime<Tz> {
+    fn same(&self, other: &Self) -> bool {
+        self == other
+    }
+}
+
 #[cfg(feature = "im")]
 impl<T: Data> Data for im::Vector<T> {
     fn same(&self, other: &Self) -> bool {