48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
use druid::widget::{Align, Flex, Label, TextBox};
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use druid::{AppLauncher, Data, Env, Lens, LocalizedString, Widget, WindowDesc, WidgetExt};
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const VERTICAL_WIDGET_SPACING: f64 = 20.0;
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const TEXT_BOX_WIDTH: f64 = 200.0;
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const WINDOW_TITLE: LocalizedString<HelloState> = LocalizedString::new("Hello World!");
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#[derive(Clone, Data, Lens)]
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struct HelloState {
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name: String,
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}
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fn main() {
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// describe the main window
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let main_window = WindowDesc::new(build_root_widget)
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.title(WINDOW_TITLE)
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.window_size((400.0, 400.0));
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// create the initial app state
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let initial_state = HelloState {
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name: "World".into(),
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};
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// start the application
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AppLauncher::with_window(main_window)
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.launch(initial_state)
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.expect("Failed to launch application");
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}
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fn build_root_widget() -> impl Widget<HelloState> {
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// a label that will determine its text based on the current app data.
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let label = Label::new(|data: &HelloState, _env: &Env| format!("Hello {}!", data.name));
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// a text box that modifies `name`.
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let text_box = TextBox::new()
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.with_placeholder("Who are we greeting?")
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.fix_width(TEXT_BOX_WIDTH)
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// .expand_width()
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.lens(HelloState::name);
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// arrange the two widgets vertically, with some padding
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let layout = Flex::column()
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.with_child(label)
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.with_spacer(VERTICAL_WIDGET_SPACING)
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.with_child(text_box);
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// center the two widgets in the available space
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Align::centered(layout)
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} |