StratoSDK is a framework with a declarative approach similar to Flutter/React, written and designed entirely for Rust.
| 1 | use crate::{ |
| 2 | event::DispatchedEvent, |
| 3 | text::{word_boundaries::WordBoundariesPolicy, IsRect, SelectionDirection, SelectionType}, |
| 4 | }; |
| 5 | use pathfinder_geometry::rect::RectF; |
| 6 | |
| 7 | use super::{ |
| 8 | AfterLayoutContext, AppContext, Element, EventContext, LayoutContext, PaintContext, Point, |
| 9 | SelectableElement, Selection, SelectionFragment, SizeConstraint, |
| 10 | }; |
| 11 | use pathfinder_geometry::vector::{vec2f, Vector2F}; |
| 12 | |
| 13 | pub struct Align { |
| 14 | child: Box<dyn Element>, |
| 15 | alignment: Vector2F, |
| 16 | size: Option<Vector2F>, |
| 17 | } |
| 18 | |
| 19 | /// By default, Align centers a child element |
| 20 | impl Align { |
| 21 | pub fn new(child: Box<dyn Element>) -> Self { |
| 22 | Self { |
| 23 | child, |
| 24 | alignment: Vector2F::zero(), |
| 25 | size: None, |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | pub fn top_center(mut self) -> Self { |
| 30 | self.alignment = vec2f(0.0, -1.0); |
| 31 | self |
| 32 | } |
| 33 | |
| 34 | pub fn top_right(mut self) -> Self { |
| 35 | self.alignment = vec2f(1.0, -1.0); |
| 36 | self |
| 37 | } |
| 38 | |
| 39 | pub fn top_left(mut self) -> Self { |
| 40 | self.alignment = vec2f(-1., -1.); |
| 41 | self |
| 42 | } |
| 43 | |
| 44 | pub fn bottom_center(mut self) -> Self { |
| 45 | self.alignment = vec2f(0.0, 1.0); |
| 46 | self |
| 47 | } |
| 48 | |
| 49 | pub fn bottom_right(mut self) -> Self { |
| 50 | self.alignment = vec2f(1.0, 1.0); |
| 51 | self |
| 52 | } |
| 53 | |
| 54 | pub fn bottom_left(mut self) -> Self { |
| 55 | self.alignment = vec2f(-1., 1.0); |
| 56 | self |
| 57 | } |
| 58 | |
| 59 | pub fn right(mut self) -> Self { |
| 60 | self.alignment = vec2f(1.0, 0.); |
| 61 | self |
| 62 | } |
| 63 | |
| 64 | pub fn left(mut self) -> Self { |
| 65 | self.alignment = vec2f(-1., 0.); |
| 66 | self |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | impl Element for Align { |
| 71 | fn layout( |
| 72 | &mut self, |
| 73 | constraint: SizeConstraint, |
| 74 | ctx: &mut LayoutContext, |
| 75 | app: &AppContext, |
| 76 | ) -> Vector2F { |
| 77 | let mut size = constraint.max; |
| 78 | |
| 79 | let child_constraint = SizeConstraint::new(Vector2F::zero(), constraint.max); |
| 80 | let child_size = self.child.layout(child_constraint, ctx, app); |
| 81 | |
| 82 | if size.x().is_infinite() { |
| 83 | size.set_x(child_size.x().max(constraint.min.x())); |
| 84 | } |
| 85 | if size.y().is_infinite() { |
| 86 | size.set_y(child_size.y().max(constraint.min.y())); |
| 87 | } |
| 88 | self.size = Some(size); |
| 89 | size |
| 90 | } |
| 91 | |
| 92 | fn after_layout(&mut self, ctx: &mut AfterLayoutContext, app: &AppContext) { |
| 93 | self.child.after_layout(ctx, app); |
| 94 | } |
| 95 | |
| 96 | fn paint(&mut self, origin: Vector2F, ctx: &mut PaintContext, app: &AppContext) { |
| 97 | let self_center = self.size.unwrap() / 2.0; |
| 98 | let self_target = self_center + self_center * self.alignment; |
| 99 | let child_center = self.child.size().unwrap() / 2.0; |
| 100 | let mut child_target = child_center + child_center * self.alignment; |
| 101 | // Make sure the child_target cannot extend past self which may happen if child size is |
| 102 | // larger than self size. |
| 103 | child_target = child_target.min(self_target); |
| 104 | let child_origin = origin - (child_target - self_target); |
| 105 | self.child.paint(child_origin, ctx, app); |
| 106 | } |
| 107 | |
| 108 | fn dispatch_event( |
| 109 | &mut self, |
| 110 | event: &DispatchedEvent, |
| 111 | ctx: &mut EventContext, |
| 112 | app: &AppContext, |
| 113 | ) -> bool { |
| 114 | self.child.dispatch_event(event, ctx, app) |
| 115 | } |
| 116 | |
| 117 | fn size(&self) -> Option<Vector2F> { |
| 118 | self.size |
| 119 | } |
| 120 | |
| 121 | fn origin(&self) -> Option<Point> { |
| 122 | self.child.origin() |
| 123 | } |
| 124 | |
| 125 | fn as_selectable_element(&self) -> Option<&dyn SelectableElement> { |
| 126 | Some(self as &dyn SelectableElement) |
| 127 | } |
| 128 | |
| 129 | #[cfg(any(test, feature = "test-util"))] |
| 130 | fn debug_text_content(&self) -> Option<String> { |
| 131 | self.child.debug_text_content() |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | impl SelectableElement for Align { |
| 136 | fn get_selection( |
| 137 | &self, |
| 138 | selection_start: Vector2F, |
| 139 | selection_end: Vector2F, |
| 140 | is_rect: IsRect, |
| 141 | ) -> Option<Vec<SelectionFragment>> { |
| 142 | self.child |
| 143 | .as_selectable_element() |
| 144 | .and_then(|selectable_child| { |
| 145 | selectable_child.get_selection(selection_start, selection_end, is_rect) |
| 146 | }) |
| 147 | } |
| 148 | |
| 149 | fn expand_selection( |
| 150 | &self, |
| 151 | point: Vector2F, |
| 152 | direction: SelectionDirection, |
| 153 | unit: SelectionType, |
| 154 | word_boundaries_policy: &WordBoundariesPolicy, |
| 155 | ) -> Option<Vector2F> { |
| 156 | self.child |
| 157 | .as_selectable_element() |
| 158 | .and_then(|selectable_child| { |
| 159 | selectable_child.expand_selection(point, direction, unit, word_boundaries_policy) |
| 160 | }) |
| 161 | } |
| 162 | |
| 163 | fn is_point_semantically_before( |
| 164 | &self, |
| 165 | absolute_point: Vector2F, |
| 166 | absolute_point_other: Vector2F, |
| 167 | ) -> Option<bool> { |
| 168 | self.child |
| 169 | .as_selectable_element() |
| 170 | .and_then(|selectable_child| { |
| 171 | selectable_child.is_point_semantically_before(absolute_point, absolute_point_other) |
| 172 | }) |
| 173 | } |
| 174 | |
| 175 | fn smart_select( |
| 176 | &self, |
| 177 | absolute_point: Vector2F, |
| 178 | smart_select_fn: crate::elements::SmartSelectFn, |
| 179 | ) -> Option<(Vector2F, Vector2F)> { |
| 180 | self.child |
| 181 | .as_selectable_element() |
| 182 | .and_then(|selectable_child| { |
| 183 | selectable_child.smart_select(absolute_point, smart_select_fn) |
| 184 | }) |
| 185 | } |
| 186 | |
| 187 | fn calculate_clickable_bounds(&self, current_selection: Option<Selection>) -> Vec<RectF> { |
| 188 | self.child |
| 189 | .as_selectable_element() |
| 190 | .map(|selectable_child| selectable_child.calculate_clickable_bounds(current_selection)) |
| 191 | .unwrap_or_default() |
| 192 | } |
| 193 | } |
| 194 |