yog_ui/
lib.rs

1//! yog-ui — retained-mode UI framework for Yog mods.
2//!
3//! Flexbox-inspired layout engine and a WPF-style [`grid`](widget::grid)
4//! (rows/columns: pixels, `Auto`, `*`) + GPU rendering via [`yog-gfx`].
5//! Use for custom inventories, guide books, tooltips, HUD overlays;
6//! [`surface`]s draw whatever the widgets don't (any `yog-gfx` call).
7//!
8//! # Quick start
9//! ```ignore
10//! use yog_ui::{UiRoot, widget, Align, FlexDir, Units};
11//!
12//! let ui = UiRoot::new("mymod:main_menu")
13//!     .style(|s| s.bg(0x88332211).padding(8.0, 8.0, 8.0, 8.0))
14//!     .child(
15//!         widget::panel(FlexDir::Column).gap(4.0)
16//!             .child(widget::label("Hello, World!").color(0xFF_DDAA00))
17//!             .child(widget::button("Click me").on_click("mymod:btn_click"))
18//!     );
19//! ```
20
21pub mod component;
22pub mod event;
23pub mod image;
24pub mod layout;
25mod render;
26pub mod rich;
27pub mod scroll;
28#[cfg(test)]
29mod state_tests;
30pub mod surface;
31pub mod theme;
32pub mod text;
33pub mod textbox;
34pub mod widget;
35
36pub use event::UiEvent;
37pub use layout::{Align, FlexDir, GridLines, LayoutNode, Rect, hit_path, node_at, set_focus};
38pub use yog_gfx::{Color, Vec2};
39pub use scroll::ScrollState;
40pub use surface::{Pointer, Surface};
41pub use textbox::{TextBoxEvent, TextBoxState};
42pub use render::{ICON_SIZE, INV_SLOT_FACE, INV_SLOT_LIGHT, INV_SLOT_SHADOW};
43pub use widget::{
44    Action, Cell, Dock, FocusStyle, GridLength, GridSpec, HAlign, StateFlags, StateStyles, Stretch,
45    StylePatch, Track, Units, VAlign, Widget,
46};
47
48use yog_gfx::GfxContext;
49
50/// Top-level UI tree.  Build it, call [`layout`], then [`render`] each frame.
51pub struct UiRoot {
52    pub id: String,
53    pub root: Widget,
54    pub layout_root: LayoutNode,
55    pub needs_layout: bool,
56}
57
58impl UiRoot {
59    pub fn new(id: impl Into<String>, root: Widget) -> Self {
60        Self {
61            id: id.into(),
62            root,
63            layout_root: LayoutNode::default(),
64            needs_layout: true,
65        }
66    }
67
68    /// Recalculate layout. Call after changing the tree or on window resize.
69    pub fn layout(&mut self, screen_w: f32, screen_h: f32) {
70        self.layout_root = layout::compute(&self.root, screen_w, screen_h);
71        self.needs_layout = false;
72    }
73
74    /// Render the UI tree via `yog-gfx` draw2d.
75    /// Must be called from `on_hud_render`.
76    pub fn render(&self, ctx: &GfxContext) {
77        text::use_host_metrics(ctx);
78        image::use_host_images(ctx);
79        let d2d = ctx.draw2d();
80        render::render_node(ctx, &d2d, &self.root, &self.layout_root);
81    }
82
83    /// The tooltip of the innermost widget at `(mx, my)` that has one.
84    /// Call after [`Self::layout`].
85    pub fn tooltip_at(&self, mx: f32, my: f32) -> Option<&str> {
86        let path = layout::deepest_path(&self.layout_root, mx, my)?;
87        let mut w = &self.root;
88        let mut found = w.tooltip.as_deref();
89        for &i in &path {
90            let Some(c) = w.children.get(i as usize) else { break };
91            w = c;
92            found = w.tooltip.as_deref().or(found);
93        }
94        found
95    }
96
97    /// Draws `text` as a vanilla tooltip next to the cursor at `(mx, my)`,
98    /// kept inside the screen. Call after [`Self::render`] so it's on top.
99    pub fn render_tooltip(ctx: &GfxContext, text: &str, mx: f32, my: f32) {
100        text::use_host_metrics(ctx);
101        let (sw, sh) = ctx.screen_size();
102        render::tooltip(&ctx.draw2d(), text, mx, my, sw as f32, sh as f32);
103    }
104
105    /// Find the deepest clickable widget at `(mx, my)` in screen coordinates.
106    pub fn hit_test(&self, mx: f32, my: f32) -> Option<&LayoutNode> {
107        layout::hit_test(&self.layout_root, mx, my)
108    }
109
110    /// Resolved rect of the (first) node tagged `id` — see [`layout::find_by_id`].
111    /// Call after [`Self::layout`].
112    pub fn find_rect(&self, id: &str) -> Option<Rect> {
113        layout::find_by_id(&self.layout_root, id)
114    }
115
116    /// Laid-out node of the (first) widget tagged `id` — rect plus scroll
117    /// state, see [`layout::find_node`]. Call after [`Self::layout`].
118    pub fn find_node(&self, id: &str) -> Option<&LayoutNode> {
119        layout::find_node(&self.layout_root, id)
120    }
121}
yog_ui/lib.rs

yog_ui/
lib.rs
