BROKEN: tonights progress

mangades/src/main.rs

@@ -1,9 +1,9 @@
 use std::sync::{RwLock, Arc};
 
-use mangui::{self, nodes::{layout::Layout, self, Style, TaffyStyle}, taffy::{self, prelude::Size, style::Dimension}, femtovg::{Paint, Color}, CurrentRenderer, SharedNode};
+use mangui::{self, nodes::{layout::Layout, self, Style, TaffyStyle}, taffy::{self, prelude::Size, style::Dimension}, femtovg::{Paint, Color}, SharedNode};
 
 fn main() {
-    let mut root = Layout::<CurrentRenderer>::new();
+    let mut root = Layout::default();
     root.style.layout.display = taffy::style::Display::Flex;
     root.style.layout.flex_direction = taffy::style::FlexDirection::Row;
     root.children.push(Arc::new(RwLock::new(nodes::primitives::Rectangle {
@@ -81,7 +81,7 @@ fn main() {
         fill: Paint::color(Color::rgb(0, 0, 255)),
         radius: 0.
     })));
-    let groot: SharedNode<CurrentRenderer> = Arc::new(RwLock::new(root));
+    let groot: SharedNode = Arc::new(RwLock::new(root));
 
     mangui::run_event_loop(groot);
 }

ui/src/events/mod.rs

@@ -0,0 +1,231 @@
+use std::ops::{AddAssign, Add, SubAssign, Sub};
+
+use taffy::{prelude::Size, style::Dimension, geometry::Point};
+use winit::event::ElementState;
+pub use winit::event::{TouchPhase, MouseScrollDelta, DeviceId, ModifiersState, VirtualKeyCode, ScanCode, MouseButton};
+
+use crate::SharedNode;
+
+pub struct NodeEvent {
+    /// Target node of event.
+    pub target: SharedNode,
+    /// Path to the target - target will be the last item in the path.
+    pub path: Vec<SharedNode>,
+    /// Actual event
+    pub event: InnerEvent
+}
+
+/// Different event types that can be sent to a node.
+pub enum InnerEvent {
+    Wheel {
+        phase: TouchPhase,
+        delta: MouseScrollDelta,
+        mouse: MouseEvent
+    },
+    /// Mouse enter event is fired when the mouse enters the target node or any of its children, and bubbles
+    MouseEnter(MouseEvent),
+    /// Mouse over event is fired when the mouse enters the target node, but not its children, and does not bubble
+    MouseOver(MouseEvent),
+    /// Mouse leave event is fired when the mouse leaves the target node or any of its children, and bubbles
+    MouseLeave(MouseEvent),
+    /// Mouse out event is fired when the mouse leaves the target node, but not its children, and does not bubble
+    MouseOut(MouseEvent),
+    /// Mouse moved
+    MouseMove(MouseEvent),
+    /// Mouse button pressed
+    MouseDown(MouseEvent),
+    /// Mouse button released
+    MouseUp(MouseEvent),
+    /// Mouse button clicked - fired after clicking and releasing a button without changing the target element
+    Click(MouseEvent),
+    /// Mouse secondary button (usually right) clicked
+    ContextMenu(MouseEvent),
+    /// Mouse tertiary button (usually middle or scroll wheel) clicked
+    AuxClick(MouseEvent),
+    /// Focus event is fired only on the target node and does not bubble
+    Focus,
+    /// Blur event is fired only on the target node and does not bubble
+    Blur,
+    /// Same as [InnerEvent::Focus] but bubbles
+    FocusIn,
+    /// Same as [InnerEvent::Blur] but bubbles
+    FocusOut,
+    /// Key pressed
+    KeyDown(KeyboardEvent),
+    /// Key released
+    KeyUp(KeyboardEvent),
+}
+
+pub struct KeyboardEvent {
+    /// Logical location ("it's effect") of the key
+    pub key: Option<VirtualKeyCode>,
+    /// Physical location of the key
+    pub code: ScanCode,
+
+    // altKey: bool,
+    // ctrlKey: bool,
+    // metaKey: bool,
+    // shiftKey: bool,
+    /// modifier keys pressed (alt, ctrl, shift or meta/logo/windows)
+    pub modifiers: ModifiersState,
+
+    // repeat: bool,
+    // char_code: u32,
+    // key_code: u32,
+    // which: u32,
+    /// DeviceId as passed by winit. An opaque, only useful when comparing with other events.
+    pub device: DeviceId
+}
+
+pub struct MouseEvent {
+    /// The button which fired the event (if any)
+    pub button: Option<MouseButton>,
+    /// The buttons which are currently pressed as a bitmask.
+    /// Use [MouseEvent::button_to_buttons] to convert a single button to a bitmask.
+    pub buttons: u8,
+
+    // altKey: bool,
+    // ctrlKey: bool,
+    // metaKey: bool,
+    // shiftKey: bool,
+    /// modifier keys pressed (alt, ctrl, shift or meta/logo/windows)
+    pub modifiers: ModifiersState,
+
+    /// The location of the mouse relative to window
+    pub client: Location,
+
+    /// The location of the mouse relative to last event
+    pub movement: Location,
+
+    /// The location of the mouse relative to the target node (not the current node!)
+    /// For the first event, this will be 0, 0
+    pub offset: Location,
+
+    /// DeviceId as passed by winit. An opaque, only useful when comparing with other events.
+    pub device: DeviceId
+}
+
+#[derive(Copy, Clone, Default, Debug, PartialEq)]
+pub struct Location {
+    pub x: f32,
+    pub y: f32
+}
+
+impl AddAssign for Location {
+    fn add_assign(&mut self, rhs: Self) {
+        self.x += rhs.x;
+        self.y += rhs.y;
+    }
+}
+
+impl Location {
+    pub fn new(x: f32, y: f32) -> Self {
+        Self { x, y }
+    }
+}
+
+impl From<(f32, f32)> for Location {
+    fn from((x, y): (f32, f32)) -> Self {
+        Self { x, y }
+    }
+}
+
+impl From<(f64, f64)> for Location {
+    fn from((x, y): (f64, f64)) -> Self {
+        Self { x: x as f32, y: y as f32 }
+    }
+}
+
+impl From<Point<f32>> for Location {
+    fn from(point: Point<f32>) -> Self {
+        Self { x: point.x, y: point.y }
+    }
+}
+
+impl Add for Location {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x + rhs.x,
+            y: self.y + rhs.y
+        }
+    }
+}
+
+impl SubAssign for Location {
+    fn sub_assign(&mut self, rhs: Self) {
+        self.x -= rhs.x;
+        self.y -= rhs.y;
+    }
+}
+
+impl Sub for Location {
+    type Output = Self;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self {
+            x: self.x - rhs.x,
+            y: self.y - rhs.y
+        }
+    }
+}
+
+impl Into<(f32, f32)> for Location {
+    fn into(self) -> (f32, f32) {
+        (self.x, self.y)
+    }
+}
+
+impl Into<Size<Dimension>> for Location {
+    fn into(self) -> Size<Dimension> {
+        Size {
+            width: Dimension::Points(self.x as f32),
+            height: Dimension::Points(self.y as f32)
+        }
+    }
+}
+
+impl MouseEvent {
+    /// Returns `true` if the shift key is pressed.
+    pub fn shift(&self) -> bool {
+        self.modifiers.intersects(ModifiersState::SHIFT)
+    }
+    /// Returns `true` if the control key is pressed.
+    pub fn ctrl(&self) -> bool {
+        self.modifiers.intersects(ModifiersState::CTRL)
+    }
+    /// Returns `true` if the alt key is pressed.
+    pub fn alt(&self) -> bool {
+        self.modifiers.intersects(ModifiersState::ALT)
+    }
+    /// Returns `true` if the logo key is pressed.
+    pub fn logo(&self) -> bool {
+        self.modifiers.intersects(ModifiersState::LOGO)
+    }
+
+    pub fn button_to_buttons(button: MouseButton) -> u8 {
+        match button {
+            MouseButton::Left => 1,
+            MouseButton::Right => 2,
+            MouseButton::Middle => 4,
+            MouseButton::Other(n) => 1 << n
+        }
+    }
+}
+
+#[derive(Default)]
+pub(crate) struct MouseValue {
+    pub last_location: Location,
+    pub buttons: u8
+}
+
+impl MouseValue {
+    fn update_buttons(&mut self, button: MouseButton, state: ElementState) {
+        let buttons = MouseEvent::button_to_buttons(button);
+        match state {
+            ElementState::Pressed => self.buttons |= buttons,
+            ElementState::Released => self.buttons &= !buttons
+        }
+    }
+}

ui/src/lib.rs

@@ -1,14 +1,17 @@
+use std::collections::HashMap;
 use std::num::NonZeroU32;
 use std::ops::Deref;
 use std::sync::{Arc, RwLock, Weak};
 
+use events::{Location, MouseValue, NodeEvent, MouseEvent};
 use femtovg::renderer::OpenGl;
 use femtovg::{Canvas, Color};
 use glutin::surface::Surface;
 use glutin::{context::PossiblyCurrentContext, display::Display};
 use glutin_winit::DisplayBuilder;
+use nodes::get_element_at;
 use raw_window_handle::HasRawWindowHandle;
-use winit::event::{Event, WindowEvent};
+use winit::event::{Event, WindowEvent, ModifiersState, DeviceId};
 use winit::event_loop::{ControlFlow, EventLoop};
 use winit::window::WindowBuilder;
 use winit::{dpi::PhysicalSize, window::Window};
@@ -27,6 +30,7 @@ use weak_table::PtrWeakKeyHashMap;
 use crate::nodes::{layout_recursively, Node, render_recursively, RenderContext};
 
 pub mod nodes;
+pub mod events;
 pub use taffy;
 pub use femtovg;
 
@@ -68,11 +72,101 @@ pub fn run_event_loop(root_node: SharedNode) -> ! {
 
     let mut should_recompute = true;
 
+    let mut modifiers = ModifiersState::default();
+    let focus_path: Option<Vec<WeakNode>> = None;
+    let mut mouse_values: HashMap<DeviceId, MouseValue> = HashMap::new();
+
     event_loop.run(move |event, _target, control_flow| match event {
         Event::WindowEvent { event, .. } => match event {
-            // WindowEvent::CursorMoved { position, .. } => {
-            //     window.request_redraw();
-            // }
+            WindowEvent::MouseWheel { device_id, delta, phase, .. } => {},
+            WindowEvent::CursorMoved { device_id, position, .. } => {
+                let mouse_value = mouse_values.get(&device_id);
+                let (movement, location, buttons) = match mouse_value {
+                    Some(mouse_value) => {
+                        let location = (position.x, position.y).into();
+                        let movement = location - mouse_value.last_location;
+                        mouse_values.insert(device_id, MouseValue {
+                            last_location: location,
+                            buttons: mouse_value.buttons
+                        });
+                        (movement, location, mouse_value.buttons)
+                    },
+                    None => {
+                        let location = (position.x, position.y).into();
+                        let movement = Location::new(0., 0.);
+                        let value = MouseValue {
+                            last_location: location,
+                            buttons: 0
+                        };
+                        mouse_values.insert(device_id, value);
+                        (movement, location, Default::default())
+                    }
+                };
+
+                let path = get_element_at(&root, &context, location);
+
+                if let Some(path) = path {
+                    let target_layout = context.node_layout.get(path.last().unwrap());
+                    let target_layout = match target_layout {
+                        Some(target_layout) => target_layout,
+                        None => { return; }
+                    };
+                    let target_layout = taffy.layout(target_layout.to_owned()).unwrap();
+                    let event = NodeEvent {
+                        target: path.last().unwrap().clone(),
+                        path: path.clone(),
+                        event: events::InnerEvent::MouseMove(MouseEvent {
+                            button: None,
+                            buttons,
+                            client: location,
+                            movement,
+                            device: device_id,
+                            modifiers,
+                            offset: location - target_layout.location.into()
+                        })
+                    };
+                }
+            },
+            WindowEvent::DroppedFile(path) => {},
+            WindowEvent::HoveredFile(path) => {},
+            WindowEvent::HoveredFileCancelled => {},
+            WindowEvent::Focused(focused) => {
+                match &focus_path {
+                    Some(path) => {
+                        let strong_focus_path: Option<Vec<SharedNode>> = convert_vec_option_to_option_vec(path.iter().map(|weak| weak.upgrade()).collect());
+                        if matches!(strong_focus_path, None) { return; }
+                        let strong_focus_path = strong_focus_path.unwrap();
+                        if strong_focus_path.len() == 0 { return; }
+
+                        let focus_event = NodeEvent {
+                            target: strong_focus_path.last().unwrap().clone(),
+                            path: strong_focus_path.clone(),
+                            event: if focused { events::InnerEvent::Focus } else { events::InnerEvent::Blur }
+                        };
+                        strong_focus_path.last().unwrap().write().unwrap().on_event(&focus_event.event);
+
+                        let focus_event = NodeEvent {
+                            target: strong_focus_path.last().unwrap().clone(),
+                            path: strong_focus_path.clone(),
+                            event: if focused { events::InnerEvent::FocusIn } else { events::InnerEvent::FocusOut }
+                        };
+
+                        for node in strong_focus_path.iter().rev() {
+                            node.write().unwrap().on_event(&focus_event.event);
+                        }
+                    },
+                    None => {}
+                };
+            },
+            WindowEvent::ModifiersChanged(new_modifiers) => { modifiers = new_modifiers; },
+            WindowEvent::KeyboardInput { device_id, input, is_synthetic } => {},
+            WindowEvent::MouseInput { device_id, state, button, .. } => {
+                let mouse_value = mouse_values.get(&device_id);
+                let mouse_value = match mouse_value {
+                    Some(mouse_value) => mouse_value,
+                    None => { return; } // Mouse move should be fired first
+                };
+            },
             WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
             WindowEvent::Resized(size) => {
                 let width: NonZeroU32 = NonZeroU32::new(size.width).unwrap();
@@ -122,6 +216,12 @@ pub fn run_event_loop(root_node: SharedNode) -> ! {
     })
 }
 
+/// I have no idea if there's a better way to do this in rust...
+/// Found via ChatGPT (the only piece of code by chatgpt itself in this whole project as of now)
+fn convert_vec_option_to_option_vec<T>(vec: Vec<Option<T>>) -> Option<Vec<T>> {
+    vec.into_iter().collect::<Option<Vec<T>>>()
+}
+
 fn create_window(event_loop: &EventLoop<()>) -> (PossiblyCurrentContext, Display, Window, Surface<WindowSurface>) {
     let window_builder = WindowBuilder::new()
         .with_inner_size(PhysicalSize::new(1000., 600.))

ui/src/nodes/layout.rs

@@ -1,23 +1,19 @@
 use std::fmt::{Debug, Formatter};
-use femtovg::Renderer;
-use crate::nodes::{Node, NodeChildren, Overflow, Style};
-use taffy::style::{Style as TaffyStyle, Dimension};
+use crate::nodes::{Node, NodeChildren, Style};
+use taffy::style::Dimension;
 
+/// A simple layout node which contains children.
 #[derive(Clone, Default)]
-
 pub struct Layout {
     pub style: Style,
     pub children: NodeChildren
 }
 
 impl Layout {
-    pub fn new() -> Layout {
+    pub fn new(children: NodeChildren) -> Layout {
         Layout {
-            style: Style {
-                layout: TaffyStyle::default(),
-                overflow: Overflow::Visible
-            },
-            children: NodeChildren::new()
+            style: Style::default(),
+            children
         }
     }
 }

ui/src/nodes/mod.rs

@@ -7,6 +7,7 @@ use femtovg::{Canvas, Color};
 use taffy::layout::Layout;
 pub use taffy::style::Style as TaffyStyle;
 use taffy::Taffy;
+use crate::events::Location;
 use crate::{NodeLayoutMap, NodePtr, CurrentRenderer};
 
 type SharedTNode = Arc<RwLock<dyn Node>>;
@@ -67,6 +68,40 @@ pub trait Node: Debug {
     /// Is an optional function instead of another trait because of missing support for trait upcasting
     // TODO: When rust supports trait upcasting, make this a trait
     fn resize(&mut self, _width: f32, _height: f32) {}
+
+    /// Called when an event happens on the node. This is called after the children have been called.
+    /// Beware! Events include a path and target with [Arc<RwLock<Node>>]s, but you already have a write lock for this node!
+    /// Remember to check if the node is the same as self, and if it is, use self instead of the node in the path to prevent deadlocks!
+    fn on_event(&mut self, _event: &crate::events::InnerEvent) {}
+}
+
+pub fn get_element_at(node: &SharedTNode, context: &RenderContext, location: Location) -> Option<Vec<SharedTNode>> {
+    let children = node.read().unwrap().children();
+    let taffy_node = context.node_layout.get(node);
+    let taffy_node = match taffy_node {
+        Some(taffy_node) => taffy_node,
+        None => { return None }
+    };
+    let layout = *context.taffy.layout(*taffy_node).unwrap();
+
+    if layout.location.x <= location.x && layout.location.y <= location.y && layout.location.x + layout.size.width >= location.x && layout.location.y + layout.size.height >= location.y {
+        match children {
+            None => {
+                Some(vec![node.clone()])
+            },
+            Some(children) => {
+                let mut result = vec![node.clone()];
+                for child in children {
+                    if let Some(mut path) = get_element_at(child, context, location) {
+                        result.append(&mut path);
+                    }
+                }
+                Some(result)
+            }
+        }
+    } else {
+        None
+    }
 }
 
 pub fn layout_recursively(node: &SharedTNode, context: &mut RenderContext) -> taffy::node::Node {