integrate into egui

egui_demo_lib/Cargo.toml

@@ -10,12 +10,7 @@ readme = "README.md"
 repository = "https://github.com/emilk/egui/tree/master/egui_demo_lib"
 categories = ["gui", "graphics"]
 keywords = ["glium", "egui", "gui", "gamedev"]
-include = [
-  "../LICENSE-APACHE",
-  "../LICENSE-MIT",
-  "**/*.rs",
-  "Cargo.toml",
-]
+include = ["../LICENSE-APACHE", "../LICENSE-MIT", "**/*.rs", "Cargo.toml"]
 
 [package.metadata.docs.rs]
 all-features = true
@@ -25,6 +20,7 @@ all-features = true
 [dependencies]
 egui = { version = "0.15.0", path = "../egui", default-features = false }
 epi = { version = "0.15.0", path = "../epi" }
+egui_datepicker = { version = "0.15.0", path = "../egui_datepicker", optional = true }
 
 chrono = { version = "0.4", features = ["js-sys", "wasmbind"], optional = true }
 enum-map = { version = "1", features = ["serde"] }
@@ -32,10 +28,15 @@ unicode_names2 = { version = "0.4.0", default-features = false }
 
 # feature "http":
 ehttp = { version = "0.1.0", optional = true }
-image = { version = "0.23", default-features = false, features = ["jpeg", "png"], optional = true }
+image = { version = "0.23", default-features = false, features = [
+  "jpeg",
+  "png",
+], optional = true }
 
 # feature "syntax_highlighting":
-syntect = { version = "4", default-features = false, features = ["default-fancy"], optional = true }
+syntect = { version = "4", default-features = false, features = [
+  "default-fancy",
+], optional = true }
 
 # feature "persistence":
 serde = { version = "1", features = ["derive"], optional = true }
@@ -44,7 +45,8 @@ serde = { version = "1", features = ["derive"], optional = true }
 criterion = { version = "0.3", default-features = false }
 
 [features]
-default = ["chrono"]
+default = ["datetime"]
+datetime = ["egui_datepicker", "chrono"]
 
 # Enable additional checks if debug assertions are enabled (debug builds).
 extra_debug_asserts = ["egui/extra_debug_asserts"]
@@ -53,7 +55,7 @@ extra_asserts = ["egui/extra_asserts"]
 
 http = ["ehttp", "image"]
 persistence = ["egui/persistence", "epi/persistence", "serde"]
-serialize = ["egui/serialize",  "serde"]
+serialize = ["egui/serialize", "serde"]
 syntax_highlighting = ["syntect"]
 
 [[bench]]

egui_demo_lib/src/apps/demo/widget_gallery.rs

@@ -1,3 +1,8 @@
+use egui_datepicker::DatePickerButton;
+
+#[cfg(feature = "datetime")]
+mod serde_date_format;
+
 #[derive(Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 enum Enum {
@@ -17,6 +22,9 @@ pub struct WidgetGallery {
     string: String,
     color: egui::Color32,
     animate_progress_bar: bool,
+    #[cfg(feature = "datetime")]
+    #[serde(with = "serde_date_format")]
+    date: chrono::Date<chrono::Utc>,
 }
 
 impl Default for WidgetGallery {
@@ -30,6 +38,8 @@ impl Default for WidgetGallery {
             string: Default::default(),
             color: egui::Color32::LIGHT_BLUE.linear_multiply(0.5),
             animate_progress_bar: false,
+            #[cfg(feature = "datetime")]
+            date: chrono::offset::Utc::now().date(),
         }
     }
 }
@@ -99,6 +109,7 @@ impl WidgetGallery {
             string,
             color,
             animate_progress_bar,
+            date,
         } = self;
 
         ui.add(doc_link_label("Label", "label,heading"));
@@ -195,6 +206,13 @@ impl WidgetGallery {
         }
         ui.end_row();
 
+        #[cfg(feature = "datetime")]
+        {
+            ui.add(doc_link_label("DatePickerButton", "DatePickerButton"));
+            ui.add(DatePickerButton::new(date));
+            ui.end_row();
+        }
+
         ui.add(doc_link_label("Separator", "separator"));
         ui.separator();
         ui.end_row();

egui_demo_lib/src/apps/demo/widget_gallery/serde_date_format.rs

@@ -0,0 +1,23 @@
+use chrono::{Date, NaiveDate, Utc};
+use serde::{self, Deserialize, Deserializer, Serializer};
+
+const FORMAT: &str = "%d.%m.%Y";
+
+pub fn serialize<S>(date: &Date<Utc>, serializer: S) -> Result<S::Ok, S::Error>
+where
+    S: Serializer,
+{
+    let s = format!("{}", date.format(FORMAT));
+    serializer.serialize_str(&s)
+}
+
+pub fn deserialize<'de, D>(deserializer: D) -> Result<Date<Utc>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s = String::deserialize(deserializer)?;
+
+    NaiveDate::parse_from_str(&s, FORMAT)
+        .map(|naive_date| Date::from_utc(naive_date, Utc))
+        .map_err(serde::de::Error::custom)
+}