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Add `Ui::interact_bg` which interacts with the ui _behind_ any of its children.pull/4077/head
Emil Ernerfeldt
9 months ago
committed by
GitHub
GitHub
7 changed files with 195 additions and 138 deletions
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use ahash::HashMap; |
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use crate::*; |
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/// Used to store each widget's [Id], [Rect] and [Sense] each frame.
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///
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/// Used to check which widget gets input when a user clicks somewhere.
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#[derive(Clone, Copy, Debug, PartialEq, Eq)] |
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pub struct WidgetRect { |
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/// The globally unique widget id.
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///
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/// For interactive widgets, this better be globally unique.
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/// If not there will be weird bugs,
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/// and also big red warning test on the screen in debug builds
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/// (see [`Options::warn_on_id_clash`]).
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///
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/// You can ensure globally unique ids using [`Ui::push_id`].
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pub id: Id, |
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/// What layer the widget is on.
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pub layer_id: LayerId, |
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/// The full widget rectangle.
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pub rect: Rect, |
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/// Where the widget is.
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///
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/// This is after clipping with the parent ui clip rect.
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pub interact_rect: Rect, |
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/// How the widget responds to interaction.
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pub sense: Sense, |
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/// Is the widget enabled?
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pub enabled: bool, |
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} |
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/// Stores the [`WidgetRect`]s of all widgets generated during a single egui update/frame.
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///
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/// All [`Ui`]s have a [`WidgetRects`], but whether or not their rects are correct
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/// depends on if [`Ui::interact_bg`] was ever called.
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#[derive(Default, Clone, PartialEq, Eq)] |
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pub struct WidgetRects { |
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/// All widgets, in painting order.
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by_layer: HashMap<LayerId, Vec<WidgetRect>>, |
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/// All widgets, by id, and their order in their respective layer
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by_id: IdMap<(usize, WidgetRect)>, |
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} |
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impl WidgetRects { |
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/// All known layers with widgets.
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pub fn layer_ids(&self) -> impl ExactSizeIterator<Item = LayerId> + '_ { |
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self.by_layer.keys().copied() |
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} |
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pub fn layers(&self) -> impl Iterator<Item = (&LayerId, &[WidgetRect])> + '_ { |
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self.by_layer |
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.iter() |
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.map(|(layer_id, rects)| (layer_id, &rects[..])) |
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} |
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#[inline] |
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pub fn get(&self, id: Id) -> Option<&WidgetRect> { |
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self.by_id.get(&id).map(|(_, w)| w) |
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} |
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#[inline] |
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pub fn contains(&self, id: Id) -> bool { |
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self.by_id.contains_key(&id) |
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} |
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/// All widgets in this layer, sorted back-to-front.
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#[inline] |
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pub fn get_layer(&self, layer_id: LayerId) -> impl Iterator<Item = &WidgetRect> + '_ { |
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self.by_layer.get(&layer_id).into_iter().flatten() |
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} |
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/// Clear the contents while retaining allocated memory.
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pub fn clear(&mut self) { |
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let Self { by_layer, by_id } = self; |
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for rects in by_layer.values_mut() { |
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rects.clear(); |
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} |
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by_id.clear(); |
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} |
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/// Insert the given widget rect in the given layer.
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pub fn insert(&mut self, layer_id: LayerId, widget_rect: WidgetRect) { |
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let Self { by_layer, by_id } = self; |
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let layer_widgets = by_layer.entry(layer_id).or_default(); |
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match by_id.entry(widget_rect.id) { |
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std::collections::hash_map::Entry::Vacant(entry) => { |
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// A new widget
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let idx_in_layer = layer_widgets.len(); |
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entry.insert((idx_in_layer, widget_rect)); |
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layer_widgets.push(widget_rect); |
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} |
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std::collections::hash_map::Entry::Occupied(mut entry) => { |
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// This is a known widget, but we might need to update it!
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// e.g. calling `response.interact(…)` to add more interaction.
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let (idx_in_layer, existing) = entry.get_mut(); |
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// Update it:
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existing.rect = widget_rect.rect; // last wins
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existing.interact_rect = widget_rect.interact_rect; // last wins
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existing.sense |= widget_rect.sense; |
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existing.enabled |= widget_rect.enabled; |
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egui_assert!( |
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existing.layer_id == widget_rect.layer_id, |
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"Widget changed layer_id during the frame" |
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); |
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if existing.layer_id == widget_rect.layer_id { |
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layer_widgets[*idx_in_layer] = *existing; |
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} |
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} |
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} |
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} |
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} |
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