Initial layers support

Cargo.toml

@@ -54,6 +54,7 @@ members = [
     "examples/svg",
     "examples/todos",
     "examples/tour",
+    "examples/alert_widget",
 ]
 
 [dependencies]

core/src/depth.rs

@@ -0,0 +1,19 @@
+/// The nesting relative to some container
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Depth {
+    /// Same as the container
+    // TODO: Rethink
+    None,
+    /// Above the container
+    Above,
+    /// Below the container
+    Below,
+    /// Above everything (Global)
+    Topmost,
+}
+
+impl Default for Depth {
+    fn default() -> Self {
+        Depth::None
+    }
+}

core/src/lib.rs

@@ -19,6 +19,7 @@ pub mod keyboard;
 mod align;
 mod background;
 mod color;
+mod depth;
 mod font;
 mod length;
 mod point;
@@ -29,6 +30,7 @@ mod vector;
 pub use align::{Align, HorizontalAlignment, VerticalAlignment};
 pub use background::Background;
 pub use color::Color;
+pub use depth::Depth;
 pub use font::Font;
 pub use length::Length;
 pub use point::Point;

examples/alert_widget/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "alert_widget"
+version = "0.1.0"
+authors = ["Capucho <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+iced = { path = "../.." }
+iced_native = { path = "../../native" }
+iced_wgpu = { path = "../../wgpu" }

examples/alert_widget/README.md

@@ -0,0 +1,13 @@
+## Alert widget
+
+A demonstration of how to build a custom widget with layer so that it stays at the top
+
+The **[`main`]** file contains all the code of the example.
+
+You can run it with `cargo run`:
+
+```
+cargo run --package custom_widget
+```
+
+[`main`]: src/main.rs