335 lines
9.5 KiB
Rust
335 lines
9.5 KiB
Rust
//! A delayed focus request must still own the live parent tree when executed.
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//! Collect first: a missing target must not unfocus unrelated fields.
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use super::Context;
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use iced::advanced::widget::{Id, Operation, Tree, operation};
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use iced::advanced::{Clipboard, Layout, Shell, Widget, layout, overlay, renderer};
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use iced::{Element, Event, Length, Rectangle, Size, Task, Theme, Vector, mouse};
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use oa_core::Id as ModelId;
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use std::collections::BTreeMap;
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub(crate) struct Stamp {
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document: ModelId,
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owner: ModelId,
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revision: u64,
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session: ModelId,
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mount: ModelId,
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}
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impl Stamp {
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pub(crate) fn new(context: Context, session: ModelId, mount: ModelId) -> Self {
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Self {
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document: context.document,
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owner: context.scenario,
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revision: context.revision,
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session,
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mount,
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}
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}
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}
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pub(crate) fn name_id(stamp: Stamp) -> Id {
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Id::from(format!(
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"{}:{}:{}:{}:{}:{}",
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super::NAME_INPUT,
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stamp.document,
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stamp.owner,
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stamp.revision,
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stamp.session,
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stamp.mount
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))
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}
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struct Owner(Option<Stamp>);
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struct Root<'a, Message, R: renderer::Renderer> {
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content: Element<'a, Message, Theme, R>,
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owner: Option<Stamp>,
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}
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pub(crate) fn root<'a, Message: 'a, R: renderer::Renderer + 'a>(
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content: impl Into<Element<'a, Message, Theme, R>>,
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owner: Option<Stamp>,
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) -> Element<'a, Message, Theme, R> {
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Element::new(Root {
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content: content.into(),
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owner,
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})
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}
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impl<Message, R: renderer::Renderer> Widget<Message, Theme, R> for Root<'_, Message, R> {
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fn children(&self) -> Vec<Tree> {
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vec![Tree::new(self.content.as_widget())]
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}
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fn diff(&self, tree: &mut Tree) {
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tree.diff_children(std::slice::from_ref(&self.content));
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}
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fn size(&self) -> Size<Length> {
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self.content.as_widget().size()
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}
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fn layout(&mut self, tree: &mut Tree, renderer: &R, limits: &layout::Limits) -> layout::Node {
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self.content
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.as_widget_mut()
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.layout(&mut tree.children[0], renderer, limits)
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}
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fn operate(
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&mut self,
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tree: &mut Tree,
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layout: Layout<'_>,
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renderer: &R,
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op: &mut dyn Operation,
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) {
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// This is computed from the current App view, never retained widget state.
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op.custom(None, layout.bounds(), &mut Owner(self.owner));
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self.content
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.as_widget_mut()
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.operate(&mut tree.children[0], layout, renderer, op);
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}
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fn update(
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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: &R,
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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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) {
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self.content.as_widget_mut().update(
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&mut tree.children[0],
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event,
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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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fn draw(
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&self,
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tree: &Tree,
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renderer: &mut R,
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theme: &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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self.content.as_widget().draw(
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&tree.children[0],
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renderer,
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theme,
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style,
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layout,
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cursor,
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viewport,
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);
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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: &R,
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) -> mouse::Interaction {
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self.content.as_widget().mouse_interaction(
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&tree.children[0],
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layout,
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cursor,
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viewport,
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renderer,
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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<'b>,
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renderer: &R,
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viewport: &Rectangle,
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translation: Vector,
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) -> Option<overlay::Element<'b, Message, Theme, R>> {
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self.content.as_widget_mut().overlay(
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&mut tree.children[0],
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layout,
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renderer,
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viewport,
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translation,
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)
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}
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}
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#[derive(Clone)]
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struct Scroll {
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index: usize,
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bounds: Rectangle,
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capacity: Vector,
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offset: Vector,
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}
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struct Collect {
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stamp: Stamp,
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valid: bool,
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translation: Vector,
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scrolls: Vec<Scroll>,
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pending: Option<Scroll>,
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index: usize,
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target: Option<(Rectangle, Vec<Scroll>)>,
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}
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pub(crate) fn task<Message: Send + 'static>(stamp: Stamp) -> Task<Message> {
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iced::advanced::widget::operate(Collect {
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stamp,
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valid: false,
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translation: Vector::ZERO,
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scrolls: vec![],
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pending: None,
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index: 0,
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target: None,
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})
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.discard()
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}
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impl Operation for Collect {
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fn custom(&mut self, _: Option<&Id>, _: Rectangle, state: &mut dyn std::any::Any) {
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if let Some(owner) = state.downcast_ref::<Owner>() {
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self.valid = owner.0 == Some(self.stamp);
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}
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}
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fn traverse(&mut self, visit: &mut dyn FnMut(&mut dyn Operation)) {
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let previous = (self.translation, self.scrolls.len());
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if let Some(scroll) = self.pending.take() {
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self.translation += scroll.offset;
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self.scrolls.push(scroll);
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}
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visit(self);
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self.translation = previous.0;
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self.scrolls.truncate(previous.1);
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}
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fn scrollable(
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&mut self,
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_: Option<&Id>,
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bounds: Rectangle,
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content: Rectangle,
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offset: Vector,
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_: &mut dyn operation::Scrollable,
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) {
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self.pending = Some(Scroll {
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index: self.index,
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bounds: translated(bounds, self.translation),
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capacity: Vector::new(
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(content.width - bounds.width).max(0.),
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(content.height - bounds.height).max(0.),
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),
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offset,
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});
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self.index += 1;
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}
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fn focusable(&mut self, id: Option<&Id>, bounds: Rectangle, _: &mut dyn operation::Focusable) {
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if id == Some(&name_id(self.stamp)) {
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self.target = Some((translated(bounds, self.translation), self.scrolls.clone()));
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}
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}
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fn finish(&self) -> operation::Outcome<()> {
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if !self.valid {
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return operation::Outcome::None;
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}
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let Some((mut bounds, ancestors)) = self.target.clone() else {
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return operation::Outcome::None;
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};
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let mut shifts = BTreeMap::new();
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for ancestor in ancestors.iter().rev() {
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let dx = reveal(
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bounds.x,
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bounds.width,
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ancestor.bounds.x,
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ancestor.bounds.width,
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);
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let dy = reveal(
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bounds.y,
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bounds.height,
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ancestor.bounds.y,
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ancestor.bounds.height,
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);
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// Drawing offsets are rounded; an already-visible axis must not
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// acquire a scroll delta from a fractional capacity alone.
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let delta = Vector::new(
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if dx == 0. {
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0.
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} else {
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(ancestor.offset.x + dx).clamp(0., ancestor.capacity.x) - ancestor.offset.x
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},
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if dy == 0. {
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0.
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} else {
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(ancestor.offset.y + dy).clamp(0., ancestor.capacity.y) - ancestor.offset.y
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},
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);
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if delta != Vector::ZERO {
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shifts.insert(ancestor.index, delta);
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}
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bounds = translated(bounds, delta);
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}
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operation::Outcome::Chain(Box::new(Apply {
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stamp: self.stamp,
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valid: false,
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shifts,
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index: 0,
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}))
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}
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}
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fn translated(bounds: Rectangle, delta: Vector) -> Rectangle {
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Rectangle {
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x: bounds.x - delta.x,
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y: bounds.y - delta.y,
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..bounds
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}
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}
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fn reveal(start: f32, length: f32, viewport: f32, size: f32) -> f32 {
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if start < viewport || length > size {
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start - viewport
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} else {
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(start + length - viewport - size).max(0.)
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}
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}
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struct Apply {
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stamp: Stamp,
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valid: bool,
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shifts: BTreeMap<usize, Vector>,
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index: usize,
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}
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impl Operation for Apply {
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fn custom(&mut self, _: Option<&Id>, _: Rectangle, state: &mut dyn std::any::Any) {
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if let Some(owner) = state.downcast_ref::<Owner>() {
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self.valid = owner.0 == Some(self.stamp);
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}
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}
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fn traverse(&mut self, visit: &mut dyn FnMut(&mut dyn Operation)) {
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visit(self);
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}
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fn focusable(&mut self, id: Option<&Id>, _: Rectangle, state: &mut dyn operation::Focusable) {
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if self.valid {
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if id == Some(&name_id(self.stamp)) {
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state.focus();
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} else {
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state.unfocus();
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}
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}
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}
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fn scrollable(
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&mut self,
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_: Option<&Id>,
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bounds: Rectangle,
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content: Rectangle,
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_: Vector,
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state: &mut dyn operation::Scrollable,
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) {
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if self.valid
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&& let Some(delta) = self.shifts.get(&self.index)
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{
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state.scroll_by(
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operation::scrollable::AbsoluteOffset {
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x: delta.x,
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y: delta.y,
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},
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bounds,
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content,
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);
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}
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self.index += 1;
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}
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}
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