diff options
Diffstat (limited to 'native/src/user_interface.rs')
| -rw-r--r-- | native/src/user_interface.rs | 203 |
1 files changed, 161 insertions, 42 deletions
diff --git a/native/src/user_interface.rs b/native/src/user_interface.rs index b9646043..00a290f1 100644 --- a/native/src/user_interface.rs +++ b/native/src/user_interface.rs @@ -1,4 +1,4 @@ -use crate::{layout, Clipboard, Element, Event, Layout, Point, Size}; +use crate::{layout, overlay, Clipboard, Element, Event, Layout, Point, Size}; use std::hash::Hasher; @@ -19,9 +19,9 @@ use std::hash::Hasher; /// [`UserInterface`]: struct.UserInterface.html #[allow(missing_debug_implementations)] pub struct UserInterface<'a, Message, Renderer> { - hash: u64, root: Element<'a, Message, Renderer>, - layout: layout::Node, + base: Layer, + overlay: Option<Layer>, bounds: Size, } @@ -94,25 +94,36 @@ where ) -> Self { let root = root.into(); - let hash = { - let hasher = &mut crate::Hasher::default(); - root.hash_layout(hasher); + let (base, overlay) = { + let hash = { + let hasher = &mut crate::Hasher::default(); + root.hash_layout(hasher); - hasher.finish() - }; + hasher.finish() + }; - let layout_is_cached = hash == cache.hash && bounds == cache.bounds; + let layout_is_cached = + hash == cache.base.hash && bounds == cache.bounds; - let layout = if layout_is_cached { - cache.layout - } else { - renderer.layout(&root, &layout::Limits::new(Size::ZERO, bounds)) + let (layout, overlay) = if layout_is_cached { + (cache.base.layout, cache.overlay) + } else { + ( + renderer.layout( + &root, + &layout::Limits::new(Size::ZERO, bounds), + ), + None, + ) + }; + + (Layer { layout, hash }, overlay) }; UserInterface { - hash, root, - layout, + base, + overlay, bounds, } } @@ -169,7 +180,7 @@ where /// /// // Update the user interface /// let messages = user_interface.update( - /// events.drain(..), + /// &events, /// cursor_position, /// None, /// &renderer, @@ -185,18 +196,54 @@ where /// ``` pub fn update( &mut self, - events: impl IntoIterator<Item = Event>, + events: &[Event], cursor_position: Point, clipboard: Option<&dyn Clipboard>, renderer: &Renderer, ) -> Vec<Message> { let mut messages = Vec::new(); + let base_cursor = if let Some(mut overlay) = + self.root.overlay(Layout::new(&self.base.layout)) + { + let layer = Self::overlay_layer( + self.overlay.take(), + self.bounds, + &mut overlay, + renderer, + ); + + for event in events { + overlay.on_event( + event.clone(), + Layout::new(&layer.layout), + cursor_position, + &mut messages, + renderer, + clipboard, + ); + } + + let base_cursor = if layer.layout.bounds().contains(cursor_position) + { + // TODO: Type-safe cursor availability + Point::new(-1.0, -1.0) + } else { + cursor_position + }; + + self.overlay = Some(layer); + + base_cursor + } else { + cursor_position + }; + for event in events { self.root.widget.on_event( - event, - Layout::new(&self.layout), - cursor_position, + event.clone(), + Layout::new(&self.base.layout), + base_cursor, &mut messages, renderer, clipboard, @@ -256,7 +303,7 @@ where /// ); /// /// let messages = user_interface.update( - /// events.drain(..), + /// &events, /// cursor_position, /// None, /// &renderer, @@ -276,16 +323,63 @@ where /// } /// ``` pub fn draw( - &self, + &mut self, renderer: &mut Renderer, cursor_position: Point, ) -> Renderer::Output { - self.root.widget.draw( - renderer, - &Renderer::Defaults::default(), - Layout::new(&self.layout), - cursor_position, - ) + let overlay = if let Some(mut overlay) = + self.root.overlay(Layout::new(&self.base.layout)) + { + let layer = Self::overlay_layer( + self.overlay.take(), + self.bounds, + &mut overlay, + renderer, + ); + + let overlay_bounds = layer.layout.bounds(); + + let overlay_primitives = overlay.draw( + renderer, + &Renderer::Defaults::default(), + Layout::new(&layer.layout), + cursor_position, + ); + + self.overlay = Some(layer); + + Some((overlay_primitives, overlay_bounds)) + } else { + None + }; + + if let Some((overlay_primitives, overlay_bounds)) = overlay { + let base_cursor = if overlay_bounds.contains(cursor_position) { + Point::new(-1.0, -1.0) + } else { + cursor_position + }; + + let base_primitives = self.root.widget.draw( + renderer, + &Renderer::Defaults::default(), + Layout::new(&self.base.layout), + base_cursor, + ); + + renderer.overlay( + base_primitives, + overlay_primitives, + overlay_bounds, + ) + } else { + self.root.widget.draw( + renderer, + &Renderer::Defaults::default(), + Layout::new(&self.base.layout), + cursor_position, + ) + } } /// Extract the [`Cache`] of the [`UserInterface`], consuming it in the @@ -295,11 +389,41 @@ where /// [`UserInterface`]: struct.UserInterface.html pub fn into_cache(self) -> Cache { Cache { - hash: self.hash, - layout: self.layout, + base: self.base, + overlay: self.overlay, bounds: self.bounds, } } + + fn overlay_layer( + cache: Option<Layer>, + bounds: Size, + overlay: &mut overlay::Element<'_, Message, Renderer>, + renderer: &Renderer, + ) -> Layer { + let new_hash = { + let hasher = &mut crate::Hasher::default(); + overlay.hash_layout(hasher); + + hasher.finish() + }; + + let layout = match cache { + Some(Layer { hash, layout }) if new_hash == hash => layout, + _ => overlay.layout(renderer, bounds), + }; + + Layer { + layout, + hash: new_hash, + } + } +} + +#[derive(Debug, Clone)] +struct Layer { + layout: layout::Node, + hash: u64, } /// Reusable data of a specific [`UserInterface`]. @@ -307,8 +431,8 @@ where /// [`UserInterface`]: struct.UserInterface.html #[derive(Debug, Clone)] pub struct Cache { - hash: u64, - layout: layout::Node, + base: Layer, + overlay: Option<Layer>, bounds: Size, } @@ -322,8 +446,11 @@ impl Cache { /// [`UserInterface`]: struct.UserInterface.html pub fn new() -> Cache { Cache { - hash: 0, - layout: layout::Node::new(Size::new(0.0, 0.0)), + base: Layer { + layout: layout::Node::new(Size::new(0.0, 0.0)), + hash: 0, + }, + overlay: None, bounds: Size::ZERO, } } @@ -334,11 +461,3 @@ impl Default for Cache { Cache::new() } } - -impl PartialEq for Cache { - fn eq(&self, other: &Cache) -> bool { - self.hash == other.hash - } -} - -impl Eq for Cache {} |