Integrate diagnostic decorations and current-source Text input boundaries
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//! Display content on top of other content.
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use crate::core::layout;
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use crate::core::mouse;
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use crate::core::overlay;
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use crate::core::renderer;
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use crate::core::widget::{Operation, Tree};
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use crate::core::{
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Clipboard, Element, Event, Layout, Length, Rectangle, Shell, Size, Vector,
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Widget,
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};
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/// A container that displays children on top of each other.
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///
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/// The first [`Element`] dictates the intrinsic [`Size`] of a [`Stack`] and
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/// will be displayed as the base layer. Every consecutive [`Element`] will be
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/// rendered on top; on its own layer.
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///
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/// You can use [`push_under`](Self::push_under) to push an [`Element`] under
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/// the current [`Stack`] without affecting its intrinsic [`Size`].
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///
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/// Keep in mind that too much layering will normally produce bad UX as well as
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/// introduce certain rendering overhead. Use this widget sparingly!
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pub struct Stack<'a, Message, Theme = crate::Theme, Renderer = crate::Renderer>
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{
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width: Length,
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height: Length,
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children: Vec<Element<'a, Message, Theme, Renderer>>,
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clip: bool,
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base_layer: usize,
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}
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impl<'a, Message, Theme, Renderer> Stack<'a, Message, Theme, Renderer>
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where
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Renderer: crate::core::Renderer,
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{
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/// Creates an empty [`Stack`].
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pub fn new() -> Self {
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Self::from_vec(Vec::new())
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}
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/// Creates a [`Stack`] with the given capacity.
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pub fn with_capacity(capacity: usize) -> Self {
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Self::from_vec(Vec::with_capacity(capacity))
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}
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/// Creates a [`Stack`] with the given elements.
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pub fn with_children(
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children: impl IntoIterator<Item = Element<'a, Message, Theme, Renderer>>,
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) -> Self {
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let iterator = children.into_iter();
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Self::with_capacity(iterator.size_hint().0).extend(iterator)
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}
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/// Creates a [`Stack`] from an already allocated [`Vec`].
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///
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/// Keep in mind that the [`Stack`] will not inspect the [`Vec`], which means
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/// it won't automatically adapt to the sizing strategy of its contents.
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///
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/// If any of the children have a [`Length::Fill`] strategy, you will need to
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/// call [`Stack::width`] or [`Stack::height`] accordingly.
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pub fn from_vec(
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children: Vec<Element<'a, Message, Theme, Renderer>>,
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) -> Self {
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Self {
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width: Length::Shrink,
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height: Length::Shrink,
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children,
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clip: false,
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base_layer: 0,
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}
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}
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/// Sets the width of the [`Stack`].
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pub fn width(mut self, width: impl Into<Length>) -> Self {
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self.width = width.into();
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self
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}
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/// Sets the height of the [`Stack`].
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pub fn height(mut self, height: impl Into<Length>) -> Self {
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self.height = height.into();
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self
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}
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/// Adds an element on top of the [`Stack`].
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pub fn push(
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mut self,
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child: impl Into<Element<'a, Message, Theme, Renderer>>,
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) -> Self {
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let child = child.into();
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let child_size = child.as_widget().size_hint();
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if !child_size.is_void() {
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if self.children.is_empty() {
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self.width = self.width.enclose(child_size.width);
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self.height = self.height.enclose(child_size.height);
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}
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self.children.push(child);
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}
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self
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}
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/// Adds an element under the [`Stack`].
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pub fn push_under(
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mut self,
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child: impl Into<Element<'a, Message, Theme, Renderer>>,
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) -> Self {
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self.children.insert(0, child.into());
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self.base_layer += 1;
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self
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}
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/// Extends the [`Stack`] with the given children.
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pub fn extend(
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self,
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children: impl IntoIterator<Item = Element<'a, Message, Theme, Renderer>>,
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) -> Self {
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children.into_iter().fold(self, Self::push)
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}
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/// Sets whether the [`Stack`] should clip overflowing content.
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///
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/// It has a slight performance overhead during presentation.
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///
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/// By default, it is set to `false`.
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pub fn clip(mut self, clip: bool) -> Self {
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self.clip = clip;
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self
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}
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}
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impl<Message, Renderer> Default for Stack<'_, Message, Renderer>
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where
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Renderer: crate::core::Renderer,
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{
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fn default() -> Self {
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Self::new()
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}
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}
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impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
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for Stack<'a, Message, Theme, Renderer>
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where
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Renderer: crate::core::Renderer,
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{
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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(&self, tree: &mut Tree) {
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tree.diff_children(&self.children);
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}
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fn size(&self) -> Size<Length> {
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Size {
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width: self.width,
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height: self.height,
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}
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}
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fn layout(
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&mut self,
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tree: &mut Tree,
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renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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let limits = limits.width(self.width).height(self.height);
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if self.children.len() <= self.base_layer {
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return layout::Node::new(limits.resolve(
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self.width,
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self.height,
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Size::ZERO,
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));
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}
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let base = self.children[self.base_layer].as_widget_mut().layout(
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&mut tree.children[self.base_layer],
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renderer,
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&limits,
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);
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let size = limits.resolve(self.width, self.height, base.size());
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let limits = layout::Limits::new(Size::ZERO, size);
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let (under, above) = self.children.split_at_mut(self.base_layer);
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let (tree_under, tree_above) =
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tree.children.split_at_mut(self.base_layer);
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let nodes = under
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.iter_mut()
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.zip(tree_under)
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.map(|(layer, tree)| {
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layer.as_widget_mut().layout(tree, renderer, &limits)
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})
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.chain(std::iter::once(base))
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.chain(above[1..].iter_mut().zip(&mut tree_above[1..]).map(
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|(layer, tree)| {
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layer.as_widget_mut().layout(tree, renderer, &limits)
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},
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))
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.collect();
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layout::Node::with_children(size, nodes)
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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: &Renderer,
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operation: &mut dyn Operation,
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) {
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operation.container(None, layout.bounds());
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operation.traverse(&mut |operation| {
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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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.for_each(|((child, state), layout)| {
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child
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.as_widget_mut()
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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 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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mut 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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) {
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if self.children.is_empty() {
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return;
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}
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let is_over = cursor.is_over(layout.bounds());
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let end = self.children.len() - 1;
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for (i, ((child, tree), layout)) in self
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.children
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.iter_mut()
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.rev()
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.zip(tree.children.iter_mut().rev())
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.zip(layout.children().rev())
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.enumerate()
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{
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child.as_widget_mut().update(
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tree, event, layout, cursor, renderer, clipboard, shell,
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viewport,
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);
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if shell.is_event_captured() {
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return;
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}
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if i < end && is_over && !cursor.is_levitating() {
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let interaction = child.as_widget().mouse_interaction(
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tree, layout, cursor, viewport, renderer,
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);
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if interaction != mouse::Interaction::None {
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cursor = cursor.levitate();
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}
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}
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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: &Renderer,
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) -> mouse::Interaction {
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self.children
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.iter()
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.rev()
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.zip(tree.children.iter().rev())
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.zip(layout.children().rev())
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.map(|((child, tree), layout)| {
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child
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.as_widget()
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.mouse_interaction(tree, layout, cursor, viewport, renderer)
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})
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.find(|&interaction| interaction != mouse::Interaction::None)
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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: &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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if let Some(clipped_viewport) = layout.bounds().intersection(viewport) {
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let viewport = if self.clip {
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&clipped_viewport
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} else {
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viewport
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};
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let layers_under = if cursor.is_over(layout.bounds()) {
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self.children
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.iter()
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.rev()
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.zip(tree.children.iter().rev())
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.zip(layout.children().rev())
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.position(|((layer, tree), layout)| {
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let interaction = layer.as_widget().mouse_interaction(
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tree, layout, cursor, viewport, renderer,
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);
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interaction != mouse::Interaction::None
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})
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.map(|i| self.children.len() - i - 1)
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.unwrap_or_default()
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} else {
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0
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};
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let mut layers = 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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.enumerate();
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let layers = layers.by_ref();
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let mut draw_layer =
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|i,
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layer: &Element<'a, Message, Theme, Renderer>,
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tree,
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layout,
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cursor| {
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if i > 0 {
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renderer.with_layer(*viewport, |renderer| {
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layer.as_widget().draw(
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tree, renderer, theme, style, layout, cursor,
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viewport,
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);
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});
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} else {
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layer.as_widget().draw(
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tree, renderer, theme, style, layout, cursor,
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viewport,
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);
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}
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};
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for (i, ((layer, tree), layout)) in layers.take(layers_under) {
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draw_layer(i, layer, tree, layout, mouse::Cursor::Unavailable);
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}
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for (i, ((layer, tree), layout)) in layers {
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draw_layer(i, layer, tree, layout, cursor);
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}
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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: &Renderer,
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viewport: &Rectangle,
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translation: Vector,
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) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
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overlay::from_children(
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&mut self.children,
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tree,
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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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impl<'a, Message, Theme, Renderer> From<Stack<'a, Message, Theme, Renderer>>
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for Element<'a, Message, Theme, Renderer>
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where
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Message: 'a,
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Theme: 'a,
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Renderer: crate::core::Renderer + 'a,
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{
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fn from(stack: Stack<'a, Message, Theme, Renderer>) -> Self {
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Self::new(stack)
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}
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}
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