StratoSDK is a framework with a declarative approach similar to Flutter/React, written and designed entirely for Rust.
| 1 | use crate::{ |
| 2 | container::Container, |
| 3 | layout::{CrossAxisAlignment, MainAxisAlignment, Row}, |
| 4 | text::{FontWeight, Text}, |
| 5 | widget::{generate_id, WidgetContext, WidgetId}, |
| 6 | Widget, |
| 7 | }; |
| 8 | use std::any::Any; |
| 9 | use strato_core::{ |
| 10 | event::{Event, EventResult}, |
| 11 | layout::{Constraints, Layout, Size}, |
| 12 | types::{Color, Point}, |
| 13 | }; |
| 14 | |
| 15 | /// A standardized top bar / header widget |
| 16 | #[derive(Debug)] |
| 17 | pub struct TopBar { |
| 18 | id: WidgetId, |
| 19 | inner: Option<Box<dyn Widget>>, |
| 20 | |
| 21 | // Props |
| 22 | pub title: String, |
| 23 | pub leading: Option<Box<dyn Widget>>, |
| 24 | pub trailing: Option<Box<dyn Widget>>, |
| 25 | pub height: f32, |
| 26 | pub background: Color, |
| 27 | } |
| 28 | |
| 29 | impl TopBar { |
| 30 | pub fn new(title: String) -> Self { |
| 31 | Self { |
| 32 | id: generate_id(), |
| 33 | inner: None, |
| 34 | title, |
| 35 | leading: None, |
| 36 | trailing: None, |
| 37 | height: 48.0, |
| 38 | background: Color::rgba(0.1, 0.1, 0.1, 0.95), // Default dark nice background |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | pub fn with_background(mut self, color: Color) -> Self { |
| 43 | self.background = color; |
| 44 | self.inner = None; // Invalidate inner widget |
| 45 | self |
| 46 | } |
| 47 | |
| 48 | pub fn with_leading(mut self, widget: impl Widget + 'static) -> Self { |
| 49 | self.leading = Some(Box::new(widget)); |
| 50 | self.inner = None; |
| 51 | self |
| 52 | } |
| 53 | |
| 54 | pub fn with_trailing(mut self, widget: impl Widget + 'static) -> Self { |
| 55 | self.trailing = Some(Box::new(widget)); |
| 56 | self.inner = None; // Invalidate inner widget |
| 57 | self |
| 58 | } |
| 59 | |
| 60 | pub fn height(mut self, height: f32) -> Self { |
| 61 | self.height = height; |
| 62 | self.inner = None; |
| 63 | self |
| 64 | } |
| 65 | |
| 66 | fn ensure_inner(&mut self) { |
| 67 | if self.inner.is_some() { |
| 68 | return; |
| 69 | } |
| 70 | |
| 71 | // Build the inner widget tree |
| 72 | let title_widget = Text::new(&self.title) |
| 73 | .size(16.0) |
| 74 | .font_weight(FontWeight::SemiBold) |
| 75 | .color(Color::WHITE); |
| 76 | |
| 77 | let mut row = Row::new() |
| 78 | .main_axis_alignment(MainAxisAlignment::Center) |
| 79 | .cross_axis_alignment(CrossAxisAlignment::Center) |
| 80 | .spacing(16.0); |
| 81 | |
| 82 | if let Some(leading) = &self.leading { |
| 83 | row = row.child(leading.clone_widget()); |
| 84 | } |
| 85 | |
| 86 | row = row.child(Box::new(title_widget) as Box<dyn Widget>); |
| 87 | |
| 88 | if let Some(trailing) = &self.trailing { |
| 89 | row = row.child(trailing.clone_widget()); |
| 90 | } |
| 91 | |
| 92 | let container = Container::new() |
| 93 | .width(f32::MAX) // Full width |
| 94 | .height(self.height) |
| 95 | .background(self.background) |
| 96 | .padding(12.0) |
| 97 | .child(row); |
| 98 | |
| 99 | self.inner = Some(Box::new(container)); |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | impl Widget for TopBar { |
| 104 | fn id(&self) -> WidgetId { |
| 105 | self.id |
| 106 | } |
| 107 | |
| 108 | fn layout(&mut self, constraints: Constraints) -> Size { |
| 109 | self.ensure_inner(); |
| 110 | self.inner.as_mut().unwrap().layout(constraints) |
| 111 | } |
| 112 | |
| 113 | fn render(&self, batch: &mut strato_renderer::batch::RenderBatch, layout: Layout) { |
| 114 | if let Some(inner) = &self.inner { |
| 115 | inner.render(batch, layout); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | fn handle_event(&mut self, event: &Event) -> EventResult { |
| 120 | self.ensure_inner(); |
| 121 | self.inner.as_mut().unwrap().handle_event(event) |
| 122 | } |
| 123 | |
| 124 | fn update(&mut self, ctx: &WidgetContext) { |
| 125 | if let Some(inner) = &mut self.inner { |
| 126 | inner.update(ctx); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | fn children(&self) -> Vec<&(dyn Widget + '_)> { |
| 131 | if let Some(inner) = &self.inner { |
| 132 | vec![inner.as_ref()] |
| 133 | } else { |
| 134 | vec![] |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | fn children_mut(&mut self) -> Vec<&mut (dyn Widget + '_)> { |
| 139 | if let Some(inner) = &mut self.inner { |
| 140 | vec![inner.as_mut()] |
| 141 | } else { |
| 142 | vec![] |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | fn hit_test(&self, point: Point, layout: Layout) -> bool { |
| 147 | if let Some(inner) = &self.inner { |
| 148 | inner.hit_test(point, layout) |
| 149 | } else { |
| 150 | false |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | fn as_any(&self) -> &dyn Any { |
| 155 | self |
| 156 | } |
| 157 | fn as_any_mut(&mut self) -> &mut dyn Any { |
| 158 | self |
| 159 | } |
| 160 | |
| 161 | fn clone_widget(&self) -> Box<dyn Widget> { |
| 162 | Box::new(Self { |
| 163 | id: generate_id(), // New ID |
| 164 | inner: None, // Reset inner to force rebuild/fresh state |
| 165 | title: self.title.clone(), |
| 166 | leading: self.leading.as_ref().map(|w| w.clone_widget()), |
| 167 | trailing: self.trailing.as_ref().map(|w| w.clone_widget()), |
| 168 | height: self.height, |
| 169 | background: self.background, |
| 170 | }) |
| 171 | } |
| 172 | } |
| 173 |