commit ae7a1cd3b09b78b0597fd5b8d73915eaa3ee7bf7
Author: Matthias Schild <matthias@matthiasschild.de>
Date:   Mon Aug 17 18:55:29 2026 +0200

    feat: initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/.vscode/launch.json b/.vscode/launch.json
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3165f65f62e28e0115a00b2ebdd37eb6f3b641855f9d636d3cd4103767159ad7"
+dependencies = [
+ "serde_core",
+]
+
+[[package]]
+name = "toml_edit"
+version = "0.25.13+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6975367e4d2ef766d86af01ffad14b622fecc8d4357a998fbc4deb6e9bacaf9b"
+dependencies = [
+ "indexmap",
+ "toml_datetime",
+ "toml_parser",
+ "winnow",
+]
+
+[[package]]
+name = "toml_parser"
+version = "1.1.3+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d38ac1cf9b95face32296c0a3ede1fdc270627c9d9c02a7274dd6d960dc4d56"
+dependencies = [
+ "winnow",
+]
+
+[[package]]
+name = "toml_writer"
+version = "1.1.2+spec-1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d56353a2a665ad0f41a421187180aab746c8c325620617ad883a99a1cbe66d2"
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
+
+[[package]]
+name = "version-compare"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03c2856837ef78f57382f06b2b8563a2f512f7185d732608fd9176cb3b8edf0e"
+
+[[package]]
+name = "windows-link"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
+
+[[package]]
+name = "windows-sys"
+version = "0.61.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "winnow"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b97319f7b8343df12cc98938e5c3eb436064524c8d2b4e30a1d3a36eecdf81"
+dependencies = [
+ "memchr",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..644fd65
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "gtktest"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+gtk4 = "0.11.4"
diff --git a/src/components/action_column.rs b/src/components/action_column.rs
new file mode 100644
index 0000000..80c1c06
--- /dev/null
+++ b/src/components/action_column.rs
@@ -0,0 +1,30 @@
+use gtk4::{
+    Application, Box, Button, Widget, gio::prelude::ApplicationExt, glib::object::Cast,
+    prelude::ButtonExt,
+};
+
+pub fn build(app: &Application) -> Box {
+    let button_start = Button::builder()
+        .label("Start machine")
+        .css_classes(vec!["btn"])
+        .build();
+    let button_stop = Button::builder()
+        .label("Stop machine")
+        .css_classes(vec!["btn"])
+        .build();
+    let button_quit = Button::builder()
+        .label("Quit")
+        .css_classes(vec!["btn"])
+        .build();
+
+    let app = app.clone();
+    button_quit.connect_clicked(move |_| {
+        app.quit();
+    });
+
+    super::column::build(&vec![
+        button_start.upcast::<Widget>(),
+        button_stop.upcast::<Widget>(),
+        button_quit.upcast::<Widget>(),
+    ])
+}
diff --git a/src/components/column.rs b/src/components/column.rs
new file mode 100644
index 0000000..6407c04
--- /dev/null
+++ b/src/components/column.rs
@@ -0,0 +1,19 @@
+use gtk4::{Box, Widget, prelude::BoxExt};
+
+pub fn build(children: &[Widget]) -> Box {
+    let column = Box::builder()
+        .orientation(gtk4::Orientation::Vertical)
+        .valign(gtk4::Align::Start)
+        .margin_top(16)
+        .margin_bottom(16)
+        .margin_start(16)
+        .margin_end(16)
+        .spacing(16)
+        .build();
+
+    for child in children {
+        column.append(child);
+    }
+
+    column
+}
diff --git a/src/components/input_form.rs b/src/components/input_form.rs
new file mode 100644
index 0000000..54f451a
--- /dev/null
+++ b/src/components/input_form.rs
@@ -0,0 +1,45 @@
+use std::rc::Rc;
+
+use gtk4::{
+    Box, Button, Entry,
+    prelude::{BoxExt, ButtonExt, EditableExt, EntryExt, WidgetExt},
+};
+
+pub fn build(on_submit: impl Fn(String) + 'static) -> Box {
+    let text_field = Entry::builder().build();
+    let button = Button::builder().label("Send").build();
+
+    let submit = {
+        let text_field = text_field.clone();
+        let on_submit = Rc::new(on_submit);
+        Rc::new(move || {
+            let text = text_field.text().to_string();
+            if text.is_empty() {
+                return;
+            }
+            on_submit(text);
+            text_field.set_text("");
+        })
+    };
+
+    {
+        let submit = submit.clone();
+        button.connect_clicked(move |_| submit());
+    }
+    {
+        let submit = submit.clone();
+        text_field.connect_activate(move |_| submit());
+    }
+
+    let row = Box::builder()
+        .orientation(gtk4::Orientation::Horizontal)
+        .valign(gtk4::Align::Start)
+        .spacing(16)
+        .build();
+
+    text_field.set_hexpand(true);
+
+    row.append(&text_field);
+    row.append(&button);
+    row
+}
diff --git a/src/components/mod.rs b/src/components/mod.rs
new file mode 100644
index 0000000..6969b26
--- /dev/null
+++ b/src/components/mod.rs
@@ -0,0 +1,4 @@
+pub mod action_column;
+pub mod column;
+pub mod input_form;
+pub mod text_list;
diff --git a/src/components/text_list.rs b/src/components/text_list.rs
new file mode 100644
index 0000000..0c2bf3d
--- /dev/null
+++ b/src/components/text_list.rs
@@ -0,0 +1,7 @@
+pub fn build() -> gtk4::ListBox {
+    gtk4::ListBox::builder().build()
+}
+
+pub fn append_item(list: &gtk4::ListBox, text: &str) {
+    list.append(&gtk4::Label::builder().label(text).xalign(0.0).build());
+}
diff --git a/src/css.rs b/src/css.rs
new file mode 100644
index 0000000..2e204de
--- /dev/null
+++ b/src/css.rs
@@ -0,0 +1,13 @@
+use gtk4::{CssProvider, STYLE_PROVIDER_PRIORITY_APPLICATION};
+
+pub fn load() {
+    let provider = CssProvider::new();
+
+    provider.load_from_path("style.css");
+
+    gtk4::style_context_add_provider_for_display(
+        &gtk4::gdk::Display::default().unwrap(),
+        &provider,
+        STYLE_PROVIDER_PRIORITY_APPLICATION,
+    );
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..01f9464
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,60 @@
+mod components;
+mod css;
+
+use gtk4::{
+    Application, ApplicationWindow, Widget,
+    gio::prelude::{ApplicationExt, ApplicationExtManual},
+    glib::{ExitCode, object::Cast},
+    prelude::{BoxExt, GtkWindowExt, WidgetExt},
+};
+
+const APP_ID: &str = "de.matthiasschild.gtk4-learning";
+const FULLSCREEN: bool = false;
+
+fn build_window(app: &Application) {
+    css::load();
+    let action_column = components::action_column::build(app);
+    let text_list = components::text_list::build();
+    let text_list2 = text_list.clone();
+    let input_form = components::input_form::build(move |text| {
+        components::text_list::append_item(&text_list2, &text);
+    });
+    let text_list_scroll = gtk4::ScrolledWindow::builder()
+        .vexpand(true)
+        .hexpand(true)
+        .build();
+    text_list_scroll.set_child(Some(&text_list));
+
+    let right_column = components::column::build(&vec![
+        input_form.upcast::<Widget>(),
+        text_list_scroll.upcast::<Widget>(),
+    ]);
+    right_column.set_vexpand(true);
+    right_column.set_hexpand(true);
+    right_column.set_valign(gtk4::Align::Fill);
+
+    let layout = gtk4::Box::builder()
+        .orientation(gtk4::Orientation::Horizontal)
+        .build();
+    layout.append(&action_column);
+    layout.append(&right_column);
+
+    let window = ApplicationWindow::builder()
+        .application(app)
+        .title("Hello, World!")
+        .default_width(800)
+        .default_height(600)
+        .fullscreened(FULLSCREEN)
+        .child(&layout)
+        .build();
+
+    window.present();
+}
+
+fn main() -> ExitCode {
+    let app = Application::builder().application_id(APP_ID).build();
+
+    println!("Start application");
+    app.connect_activate(build_window);
+    app.run()
+}
diff --git a/style.css b/style.css
new file mode 100644
index 0000000..52f6138
--- /dev/null
+++ b/style.css
@@ -0,0 +1,4 @@
+.btn {
+    padding: 8px 32px;
+    font-size: 24px;
+}
\ No newline at end of file