pub fn vstack(children: &[View]) -> ViewExpand description
Create a VStack.
Examples found in repository?
examples/app.rs (lines 11-25)
9fn main() {
10 run(|| {
11 vstack(&[
12 text("Hello from Rust! 🦀")
13 .padding(12.0)
14 .bg(Color::BLUE)
15 .rounded(8.0)
16 .opacity(0.95),
17 spacer(),
18 hstack(&[
19 image("star.fill"),
20 text("No Swift compiler needed"),
21 ]),
22 divider(),
23 text("Pure dlsym + arm64 asm → SwiftUI")
24 .padding(8.0),
25 ])
26 .padding(40.0)
27 .into_handle()
28 });
29}More examples
examples/scenes.rs (lines 49-65)
48fn main_window() -> ViewHandle {
49 vstack(&[
50 text("A SwiftUI app, no Swift source")
51 .font_size(20.0)
52 .padding(8.0),
53 divider(),
54 text(&format!("count: {}", counter().get()))
55 .font_size(34.0)
56 .padding(12.0),
57 hstack(&[
58 button("−", || counter().set(counter().get() - 1)),
59 button("+", || counter().set(counter().get() + 1)),
60 ]),
61 spacer(),
62 text("⌘, for Settings · the ★ in the menu bar has a menu")
63 .font_size(11.0)
64 .opacity(0.6),
65 ])
66 .padding(24.0)
67 .frame(420.0, 300.0)
68 .focused_scene_value(counter_focus_key(), counter().get())
69 .into_handle()
70}
71
72/// The focused-value key the window publishes its count under.
73///
74/// `.focusedSceneValue(\.key, value)` is how a window tells the commands above
75/// it what is selected. Both halves are synthesised at run time: the
76/// `FocusedValueKey` conformance *and* the `WritableKeyPath<FocusedValues, Int?>`
77/// — `FocusedValues` exports no properties, so unlike `EnvironmentValues` there
78/// is no SwiftUI modifier holding a key path to borrow.
79///
80/// The menu cannot *read* it yet: that needs `@FocusedValue`, a `DynamicProperty`
81/// SwiftUI instantiates itself, which is a different mechanism from anything
82/// here. What this demonstrates is the publishing half, in a real app.
83fn counter_focus_key() -> &'static views::FocusKey {
84 static K: std::sync::OnceLock<views::FocusKey> = std::sync::OnceLock::new();
85 K.get_or_init(|| views::focus_key("sceneCounter"))
86}
87
88fn settings_pane() -> ViewHandle {
89 vstack(&[
90 text("Preferences").font_size(18.0),
91 divider(),
92 text("This pane is a `Settings` scene — the one ⌘, opens."),
93 text(&format!("It sees the same state: {}", counter().get()))
94 .opacity(0.7),
95 ])
96 .padding(24.0)
97 .frame(360.0, 200.0)
98 .into_handle()
99}
100
101fn utility_window() -> ViewHandle {
102 vstack(&[
103 text("Utility").font_size(16.0),
104 text("A `Window`, not a `WindowGroup`: one of it, addressed by id.")
105 .opacity(0.7),
106 ])
107 .padding(20.0)
108 .frame(320.0, 140.0)
109 .into_handle()
110}
111
112fn menu_bar_item() -> ViewHandle {
113 vstack(&[
114 text(&format!("count: {}", counter().get())),
115 button("Reset", || counter().set(0)),
116 ])
117 .padding(10.0)
118 .into_handle()
119}
120
121/// The whole app, as one scene.
122///
123/// Built afresh every time SwiftUI reads `App.body`, which is what makes the
124/// numbers in it live rather than a snapshot taken at launch.
125///
126/// macOS only, and not by choice: `Settings`, `Window`, `MenuBarExtra` and the
127/// whole of `Commands` are `@available(iOS, unavailable)`. iOS gets
128/// [`ios_body`], which is the part of this that exists there.
129#[cfg(target_os = "macos")]
130fn body() -> SceneHandle {
131 scenes! {
132 window_group { main_window() }
133 settings { settings_pane() }
134 window("Utility", "utility") { utility_window() }
135 menu_bar_extra("Count", "star.fill") { menu_bar_item() }
136 commands {
137 // A menu of its own, beside File and Edit.
138 menu("Counter") {
139 vstack(&[
140 button("Increment", || counter().set(counter().get() + 1)),
141 button("Decrement", || counter().set(counter().get() - 1)),
142 divider(),
143 button("Reset", || counter().set(0)),
144 ])
145 }
146 // In place of the standard File ▸ New.
147 replacing(NewItem) { button("New Count", || counter().set(0)) }
148 // Added after the standard Help entry.
149 after(Help) {
150 button("About this Rust app", || {
151 eprintln!("built with no Swift compiler in sight");
152 })
153 }
154 }
155 }
156}