311 lines
8 KiB
Rust
311 lines
8 KiB
Rust
// Copyright 2023 System76 <info@system76.com>
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// SPDX-License-Identifier: MPL-2.0
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use crate::{Element, Renderer};
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use derive_setters::Setters;
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use iced_core::event::{self, Event};
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use iced_core::widget::{Operation, Tree};
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use iced_core::{
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layout, mouse, overlay, renderer, Alignment, Clipboard, Layout, Length, Padding, Rectangle,
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Shell, Widget,
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};
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use iced_renderer::core::widget::OperationOutputWrapper;
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/// Responsively generates rows and columns of widgets based on its dimmensions.
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#[must_use]
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#[derive(Setters)]
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pub struct Grid<'a, Message> {
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#[setters(skip)]
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children: Vec<Element<'a, Message>>,
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/// Where children shall be assigned in the grid.
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#[setters(skip)]
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assignments: Vec<Assignment>,
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/// Sets the padding around the widget.
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padding: Padding,
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/// Alignment across columns
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column_alignment: Alignment,
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/// Alignment across rows
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row_alignment: Alignment,
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/// Sets the space between each column of items.
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column_spacing: u16,
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/// Sets the space between each item in a row.
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row_spacing: u16,
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/// Sets the width of the grid.
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width: Length,
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/// Sets the height of the grid.
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height: Length,
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/// Sets the max width
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max_width: f32,
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#[setters(skip)]
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column: u16,
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#[setters(skip)]
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row: u16,
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}
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impl<'a, Message> Grid<'a, Message> {
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pub const fn new() -> Self {
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Self {
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children: Vec::new(),
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assignments: Vec::new(),
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padding: Padding::ZERO,
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column_alignment: Alignment::Start,
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row_alignment: Alignment::Start,
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column_spacing: 4,
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row_spacing: 4,
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width: Length::Shrink,
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height: Length::Shrink,
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max_width: f32::INFINITY,
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column: 1,
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row: 1,
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}
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}
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/// Attach a new element with a given grid assignment.
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pub fn push(mut self, widget: impl Into<Element<'a, Message>>) -> Self {
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self.children.push(widget.into());
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self.assignments.push(Assignment {
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column: self.column,
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row: self.row,
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width: 1,
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height: 1,
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});
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self.column += 1;
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self
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}
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/// Attach a new element with custom properties
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pub fn push_with<W, S>(mut self, widget: W, setup: S) -> Self
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where
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W: Into<Element<'a, Message>>,
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S: Fn(Assignment) -> Assignment,
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{
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self.children.push(widget.into());
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self.assignments.push(setup(Assignment {
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column: self.column,
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row: self.row,
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width: 1,
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height: 1,
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}));
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self.column += 1;
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self
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}
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pub fn insert_row(mut self) -> Self {
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self.row += 1;
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self.column = 1;
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self
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}
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}
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impl<'a, Message: 'static + Clone> Widget<Message, Renderer> for Grid<'a, Message> {
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fn children(&self) -> Vec<Tree> {
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self.children.iter().map(Tree::new).collect()
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}
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fn diff(&mut self, tree: &mut Tree) {
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tree.diff_children(self.children.as_mut_slice());
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}
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fn width(&self) -> Length {
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self.width
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}
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fn height(&self) -> Length {
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self.height
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}
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fn layout(&self, renderer: &Renderer, limits: &layout::Limits) -> layout::Node {
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let limits = limits
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.max_width(self.max_width)
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.width(self.width())
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.height(self.height());
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super::layout::resolve(
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renderer,
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&limits,
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&self.children,
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&self.assignments,
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self.width,
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self.height,
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self.padding,
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self.column_alignment,
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self.row_alignment,
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f32::from(self.column_spacing),
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f32::from(self.row_spacing),
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)
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}
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fn operate(
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&self,
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tree: &mut Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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operation: &mut dyn Operation<OperationOutputWrapper<Message>>,
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) {
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operation.container(None, layout.bounds(), &mut |operation| {
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self.children
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.iter()
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.zip(&mut tree.children)
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.zip(layout.children())
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.for_each(|((child, state), layout)| {
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child
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.as_widget()
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.operate(state, layout, renderer, operation);
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});
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});
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}
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fn on_event(
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&mut self,
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tree: &mut Tree,
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event: Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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renderer: &Renderer,
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clipboard: &mut dyn Clipboard,
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shell: &mut Shell<'_, Message>,
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viewport: &Rectangle,
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) -> event::Status {
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self.children
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.iter_mut()
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.zip(&mut tree.children)
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.zip(layout.children())
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.map(|((child, state), layout)| {
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child.as_widget_mut().on_event(
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state,
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event.clone(),
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layout,
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cursor,
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renderer,
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clipboard,
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shell,
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viewport,
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)
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})
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.fold(event::Status::Ignored, event::Status::merge)
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}
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fn mouse_interaction(
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&self,
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tree: &Tree,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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renderer: &Renderer,
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) -> mouse::Interaction {
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self.children
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.iter()
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.zip(&tree.children)
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.zip(layout.children())
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.map(|((child, state), layout)| {
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child
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.as_widget()
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.mouse_interaction(state, layout, cursor, viewport, renderer)
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})
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.max()
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.unwrap_or_default()
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}
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fn draw(
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&self,
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tree: &Tree,
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renderer: &mut Renderer,
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theme: &crate::Theme,
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style: &renderer::Style,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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viewport: &Rectangle,
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) {
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for ((child, state), layout) in self
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.children
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.iter()
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.zip(&tree.children)
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.zip(layout.children())
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{
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child
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.as_widget()
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.draw(state, renderer, theme, style, layout, cursor, viewport);
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}
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}
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fn overlay<'b>(
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&'b mut self,
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tree: &'b mut Tree,
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layout: Layout<'_>,
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renderer: &Renderer,
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) -> Option<overlay::Element<'b, Message, Renderer>> {
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overlay::from_children(&mut self.children, tree, layout, renderer)
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}
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#[cfg(feature = "a11y")]
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/// get the a11y nodes for the widget
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fn a11y_nodes(
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&self,
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layout: Layout<'_>,
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state: &Tree,
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p: mouse::Cursor,
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) -> iced_accessibility::A11yTree {
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use iced_accessibility::A11yTree;
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A11yTree::join(
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self.children
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.iter()
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.zip(layout.children())
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.zip(state.children.iter())
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.map(|((c, c_layout), state)| c.as_widget().a11y_nodes(c_layout, state, p)),
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)
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}
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}
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impl<'a, Message: 'static + Clone> From<Grid<'a, Message>> for Element<'a, Message> {
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fn from(flex_row: Grid<'a, Message>) -> Self {
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Self::new(flex_row)
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}
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}
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#[derive(Copy, Clone, Debug, Setters)]
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#[must_use]
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pub struct Assignment {
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pub(super) column: u16,
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pub(super) row: u16,
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pub(super) width: u16,
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pub(super) height: u16,
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}
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impl Assignment {
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pub const fn new() -> Self {
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Self {
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column: 0,
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row: 0,
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width: 1,
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height: 1,
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}
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}
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}
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impl From<(u16, u16)> for Assignment {
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fn from((column, row): (u16, u16)) -> Self {
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Self {
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column,
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row,
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width: 1,
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height: 1,
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}
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}
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}
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impl From<(u16, u16, u16, u16)> for Assignment {
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fn from((column, row, width, height): (u16, u16, u16, u16)) -> Self {
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Self {
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column,
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row,
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width,
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height,
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}
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}
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}
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