very primitive column layout

src/main.rs

@@ -8,6 +8,7 @@
 
 use abletk::plugin::QuitPlugin;
 use abletk::prelude::*;
+use abletk::widget::Column;
 
 #[launch]
 fn launch() -> _ {
@@ -15,8 +16,9 @@ fn launch() -> _ {
         .apply_plugin(QuitPlugin)
         .add_window(Window::builder(
             Row::new()
-                .add(Label::new("Hello, AbleTK! ")
+                .add(Label::new("Hello, ")
                     .color(rgb!(0xFF00FFFF)))
-                .add(Label::new("Hello, World!")
-                    .color(rgb!(0x64CAFEFF)))))
+                .add(Column::new()
+                    .add(Label::new("World!"))
+                    .add(Label::new("AbleTK!")))))
 }

src/widget/column.rs

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2022 Umut İnan Erdoğan <umutinanerdogan@pm.me>
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+use crate::{layout::position::Position, widget::Widget};
+use abletk_common::Renderer;
+
+pub struct Column {
+    widgets: Vec<Box<dyn Widget>>,
+}
+
+impl Widget for Column {
+    fn draw(&self, renderer: &mut Renderer) {
+        self.widgets.iter().for_each(|widget| {
+            let pos = widget.position(renderer);
+            renderer.position_at(
+                renderer.position().0 + pos.x(),
+                renderer.position().1 + pos.y()
+            );
+            widget.draw(renderer);
+            renderer.position_at(
+                renderer.position().0,
+                renderer.position().1 + pos.height()
+            );
+        });
+    }
+
+    fn position(&self, renderer: &mut Renderer) -> Position {
+        let (width, height) = self.widgets.iter()
+            .map(|widget| widget.position(renderer))
+            .map(|pos| (pos.width(), pos.height()))
+            .fold((0, 0), |accum, item| (
+                if item.0 > accum.0 { item.0 } else { accum.0 },
+                accum.1 + item.1
+            ));
+
+        Position::new(0, 0, width, height)
+    }
+}
+
+impl Column {
+    pub fn new() -> Self {
+        Self {
+            widgets: Vec::new(),
+        }
+    }
+
+    pub fn add<T: Widget + 'static>(mut self, widget: T) -> Self {
+        self.widgets.push(Box::new(widget));
+        self
+    }
+}

src/widget/label.rs

@@ -30,7 +30,7 @@ impl Label {
     pub fn new<S: Into<String>>(text: S) -> Self {
         Self {
             text: text.into(),
-            color: rgb!(0xFFFFFFFF),
+            color: rgb!(0x000000FF),
         }
     }
 

src/widget/mod.rs

@@ -6,10 +6,12 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
+mod column;
 mod label;
 mod row;
 
 use abletk_common::Renderer;
+pub use column::*;
 pub use label::*;
 pub use row::*;