StratoSDK is a framework with a declarative approach similar to Flutter/React, written and designed entirely for Rust.
| 1 | //! Common control interaction and accessibility primitives. |
| 2 | //! |
| 3 | //! This module provides a lightweight state machine that widgets can embed to |
| 4 | //! unify pressed/hover/disabled handling and animate visual responses. It also |
| 5 | //! carries accessibility semantics (role, label, hint) so controls can expose |
| 6 | //! intent to higher level tooling. |
| 7 | |
| 8 | use crate::animation::Tween; |
| 9 | use crate::widget::WidgetState; |
| 10 | use strato_core::event::{Event, EventResult, KeyCode, MouseButton}; |
| 11 | use strato_core::state::Signal; |
| 12 | use strato_core::types::{Point, Rect}; |
| 13 | |
| 14 | /// The ARIA-like role associated with a control. |
| 15 | #[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| 16 | pub enum ControlRole { |
| 17 | Button, |
| 18 | Checkbox, |
| 19 | Radio, |
| 20 | Slider, |
| 21 | Input, |
| 22 | Toggle, |
| 23 | } |
| 24 | |
| 25 | impl Default for ControlRole { |
| 26 | fn default() -> Self { |
| 27 | ControlRole::Button |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | /// Accessibility semantics for a control. |
| 32 | #[derive(Debug, Clone, Default)] |
| 33 | pub struct ControlSemantics { |
| 34 | pub role: ControlRole, |
| 35 | pub label: Option<String>, |
| 36 | pub hint: Option<String>, |
| 37 | pub value: Option<String>, |
| 38 | pub toggled: Option<bool>, |
| 39 | } |
| 40 | |
| 41 | impl ControlSemantics { |
| 42 | pub fn new(role: ControlRole) -> Self { |
| 43 | Self { |
| 44 | role, |
| 45 | ..Default::default() |
| 46 | } |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | /// Shared interaction state for focusable/pressable controls. |
| 51 | #[derive(Debug, Clone)] |
| 52 | pub struct ControlState { |
| 53 | state: Signal<WidgetState>, |
| 54 | interaction_progress: Signal<f32>, |
| 55 | focus_progress: Signal<f32>, |
| 56 | semantics: ControlSemantics, |
| 57 | } |
| 58 | |
| 59 | impl ControlState { |
| 60 | /// Create a new control state for the given role. |
| 61 | pub fn new(role: ControlRole) -> Self { |
| 62 | Self { |
| 63 | state: Signal::new(WidgetState::Normal), |
| 64 | interaction_progress: Signal::new(0.0), |
| 65 | focus_progress: Signal::new(0.0), |
| 66 | semantics: ControlSemantics::new(role), |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /// Current widget state. |
| 71 | pub fn state(&self) -> WidgetState { |
| 72 | self.state.get() |
| 73 | } |
| 74 | |
| 75 | /// Set the widget state directly (used by tests/demo code). |
| 76 | pub fn set_state(&self, state: WidgetState) { |
| 77 | self.state.set(state); |
| 78 | } |
| 79 | |
| 80 | /// Mark the control as disabled/enabled. |
| 81 | pub fn set_disabled(&self, disabled: bool) { |
| 82 | if disabled { |
| 83 | self.state.set(WidgetState::Disabled); |
| 84 | } else if self.state.get() == WidgetState::Disabled { |
| 85 | self.state.set(WidgetState::Normal); |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | /// Update the semantics label. |
| 90 | pub fn set_label(&mut self, label: impl Into<String>) { |
| 91 | self.semantics.label = Some(label.into()); |
| 92 | } |
| 93 | |
| 94 | /// Update the semantics hint/description. |
| 95 | pub fn set_hint(&mut self, hint: impl Into<String>) { |
| 96 | self.semantics.hint = Some(hint.into()); |
| 97 | } |
| 98 | |
| 99 | /// Update the semantics value (e.g., slider percentage). |
| 100 | pub fn set_value(&mut self, value: impl Into<String>) { |
| 101 | self.semantics.value = Some(value.into()); |
| 102 | } |
| 103 | |
| 104 | /// Mark whether the control is toggled/checked. |
| 105 | pub fn set_toggled(&mut self, toggled: bool) { |
| 106 | self.semantics.toggled = Some(toggled); |
| 107 | } |
| 108 | |
| 109 | /// Access semantics for inspectors or higher-level layers. |
| 110 | pub fn semantics(&self) -> &ControlSemantics { |
| 111 | &self.semantics |
| 112 | } |
| 113 | |
| 114 | /// Smooth interaction animation state toward the target. |
| 115 | pub fn update(&self, delta_time: f32) { |
| 116 | let target_interaction = match self.state.get() { |
| 117 | WidgetState::Pressed => 1.0, |
| 118 | WidgetState::Hovered => 0.65, |
| 119 | WidgetState::Focused => 0.4, |
| 120 | WidgetState::Disabled => 0.0, |
| 121 | WidgetState::Normal => 0.0, |
| 122 | }; |
| 123 | let target_focus = if matches!(self.state.get(), WidgetState::Focused) { |
| 124 | 1.0 |
| 125 | } else { |
| 126 | 0.0 |
| 127 | }; |
| 128 | |
| 129 | let smooth = |current: f32, target: f32| { |
| 130 | let step = (target - current) * (delta_time * 8.0).clamp(0.0, 1.0); |
| 131 | (current + step).clamp(0.0, 1.0) |
| 132 | }; |
| 133 | |
| 134 | self.interaction_progress |
| 135 | .set(smooth(self.interaction_progress.get(), target_interaction)); |
| 136 | self.focus_progress |
| 137 | .set(smooth(self.focus_progress.get(), target_focus)); |
| 138 | } |
| 139 | |
| 140 | /// Overall interaction factor used for color/opacity blending. |
| 141 | pub fn interaction_factor(&self) -> f32 { |
| 142 | Tween::new(0.0, 1.0).transform( |
| 143 | self.interaction_progress |
| 144 | .get() |
| 145 | .max(self.focus_progress.get()), |
| 146 | ) |
| 147 | } |
| 148 | |
| 149 | /// Update hover state when the cursor enters/leaves the control bounds. |
| 150 | pub fn hover(&self, within: bool) { |
| 151 | if self.state.get() == WidgetState::Disabled { |
| 152 | return; |
| 153 | } |
| 154 | match (within, self.state.get()) { |
| 155 | (true, WidgetState::Normal) => self.state.set(WidgetState::Hovered), |
| 156 | (false, WidgetState::Hovered) => self.state.set(WidgetState::Normal), |
| 157 | (false, WidgetState::Pressed) => self.state.set(WidgetState::Normal), |
| 158 | _ => {} |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /// Start a press interaction if the point is inside. |
| 163 | pub fn press(&self, point: Point, bounds: Rect) -> bool { |
| 164 | if self.state.get() == WidgetState::Disabled { |
| 165 | return false; |
| 166 | } |
| 167 | if bounds.contains(point) { |
| 168 | self.state.set(WidgetState::Pressed); |
| 169 | return true; |
| 170 | } |
| 171 | false |
| 172 | } |
| 173 | |
| 174 | /// Finish a press interaction and report whether activation should occur. |
| 175 | pub fn release(&self, point: Point, bounds: Rect) -> bool { |
| 176 | if self.state.get() == WidgetState::Disabled { |
| 177 | return false; |
| 178 | } |
| 179 | if self.state.get() == WidgetState::Pressed { |
| 180 | let is_hovered = bounds.contains(point); |
| 181 | self.state.set(if is_hovered { |
| 182 | WidgetState::Hovered |
| 183 | } else { |
| 184 | WidgetState::Normal |
| 185 | }); |
| 186 | return is_hovered; |
| 187 | } |
| 188 | false |
| 189 | } |
| 190 | |
| 191 | /// Update focus state based on keyboard navigation. |
| 192 | pub fn focus(&self) { |
| 193 | if self.state.get() != WidgetState::Disabled { |
| 194 | self.state.set(WidgetState::Focused); |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | /// Handle blur. |
| 199 | pub fn blur(&self) { |
| 200 | if self.state.get() == WidgetState::Focused { |
| 201 | self.state.set(WidgetState::Normal); |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | /// Keyboard activations for accessible triggers. |
| 206 | pub fn handle_keyboard_activation(&self, event: &Event) -> EventResult { |
| 207 | match event { |
| 208 | Event::KeyDown(key) if matches!(key.key_code, KeyCode::Enter | KeyCode::Space) => { |
| 209 | if self.state.get() != WidgetState::Disabled { |
| 210 | self.state.set(WidgetState::Pressed); |
| 211 | return EventResult::Handled; |
| 212 | } |
| 213 | } |
| 214 | Event::KeyUp(key) if matches!(key.key_code, KeyCode::Enter | KeyCode::Space) => { |
| 215 | if self.state.get() == WidgetState::Pressed { |
| 216 | self.state.set(WidgetState::Focused); |
| 217 | return EventResult::Handled; |
| 218 | } |
| 219 | } |
| 220 | _ => {} |
| 221 | } |
| 222 | EventResult::Ignored |
| 223 | } |
| 224 | |
| 225 | /// Pointer-based interaction dispatcher. |
| 226 | pub fn handle_pointer_event(&self, event: &Event, bounds: Rect) -> EventResult { |
| 227 | match event { |
| 228 | Event::MouseMove(mouse) => { |
| 229 | let point = Point::new(mouse.position.x, mouse.position.y); |
| 230 | self.hover(bounds.contains(point)); |
| 231 | EventResult::Ignored |
| 232 | } |
| 233 | Event::MouseDown(mouse) => { |
| 234 | if let Some(MouseButton::Left) = mouse.button { |
| 235 | let point = Point::new(mouse.position.x, mouse.position.y); |
| 236 | if self.press(point, bounds) { |
| 237 | return EventResult::Handled; |
| 238 | } |
| 239 | } |
| 240 | EventResult::Ignored |
| 241 | } |
| 242 | Event::MouseUp(mouse) => { |
| 243 | if let Some(MouseButton::Left) = mouse.button { |
| 244 | let point = Point::new(mouse.position.x, mouse.position.y); |
| 245 | if self.release(point, bounds) { |
| 246 | return EventResult::Handled; |
| 247 | } |
| 248 | } |
| 249 | EventResult::Ignored |
| 250 | } |
| 251 | _ => EventResult::Ignored, |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 |