├── .gitignore
├── Cargo.lock
├── Cargo.toml
├── example
    ├── Cargo.toml
    └── src
    │   ├── main.rs
    │   └── node.rs
├── rustfmt.toml
└── src
    ├── lib.rs
    ├── theme.rs
    ├── widget.rs
    └── widget
        ├── graph.rs
        └── graph
            ├── editor.rs
            └── node.rs


/.gitignore:
--------------------------------------------------------------------------------
1 | /target
2 | 


--------------------------------------------------------------------------------
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2136 | source = "registry+https://github.com/rust-lang/crates.io-index"
2137 | checksum = "1c38c045535d93ec4f0b4defec448e4291638ee608530863b1e2ba115d4fff7f"
2138 | 
2139 | [[package]]
2140 | name = "wasm-timer"
2141 | version = "0.2.5"
2142 | source = "registry+https://github.com/rust-lang/crates.io-index"
2143 | checksum = "be0ecb0db480561e9a7642b5d3e4187c128914e58aa84330b9493e3eb68c5e7f"
2144 | dependencies = [
2145 |  "futures",
2146 |  "js-sys",
2147 |  "parking_lot 0.11.2",
2148 |  "pin-utils",
2149 |  "wasm-bindgen",
2150 |  "wasm-bindgen-futures",
2151 |  "web-sys",
2152 | ]
2153 | 
2154 | [[package]]
2155 | name = "wayland-client"
2156 | version = "0.29.5"
2157 | source = "registry+https://github.com/rust-lang/crates.io-index"
2158 | checksum = "3f3b068c05a039c9f755f881dc50f01732214f5685e379829759088967c46715"
2159 | dependencies = [
2160 |  "bitflags",
2161 |  "downcast-rs",
2162 |  "libc",
2163 |  "nix 0.24.2",
2164 |  "scoped-tls",
2165 |  "wayland-commons",
2166 |  "wayland-scanner",
2167 |  "wayland-sys",
2168 | ]
2169 | 
2170 | [[package]]
2171 | name = "wayland-commons"
2172 | version = "0.29.5"
2173 | source = "registry+https://github.com/rust-lang/crates.io-index"
2174 | checksum = "8691f134d584a33a6606d9d717b95c4fa20065605f798a3f350d78dced02a902"
2175 | dependencies = [
2176 |  "nix 0.24.2",
2177 |  "once_cell",
2178 |  "smallvec",
2179 |  "wayland-sys",
2180 | ]
2181 | 
2182 | [[package]]
2183 | name = "wayland-cursor"
2184 | version = "0.29.5"
2185 | source = "registry+https://github.com/rust-lang/crates.io-index"
2186 | checksum = "6865c6b66f13d6257bef1cd40cbfe8ef2f150fb8ebbdb1e8e873455931377661"
2187 | dependencies = [
2188 |  "nix 0.24.2",
2189 |  "wayland-client",
2190 |  "xcursor",
2191 | ]
2192 | 
2193 | [[package]]
2194 | name = "wayland-protocols"
2195 | version = "0.29.5"
2196 | source = "registry+https://github.com/rust-lang/crates.io-index"
2197 | checksum = "b950621f9354b322ee817a23474e479b34be96c2e909c14f7bc0100e9a970bc6"
2198 | dependencies = [
2199 |  "bitflags",
2200 |  "wayland-client",
2201 |  "wayland-commons",
2202 |  "wayland-scanner",
2203 | ]
2204 | 
2205 | [[package]]
2206 | name = "wayland-scanner"
2207 | version = "0.29.5"
2208 | source = "registry+https://github.com/rust-lang/crates.io-index"
2209 | checksum = "8f4303d8fa22ab852f789e75a967f0a2cdc430a607751c0499bada3e451cbd53"
2210 | dependencies = [
2211 |  "proc-macro2",
2212 |  "quote",
2213 |  "xml-rs",
2214 | ]
2215 | 
2216 | [[package]]
2217 | name = "wayland-sys"
2218 | version = "0.29.5"
2219 | source = "registry+https://github.com/rust-lang/crates.io-index"
2220 | checksum = "be12ce1a3c39ec7dba25594b97b42cb3195d54953ddb9d3d95a7c3902bc6e9d4"
2221 | dependencies = [
2222 |  "dlib",
2223 |  "lazy_static",
2224 |  "pkg-config",
2225 | ]
2226 | 
2227 | [[package]]
2228 | name = "web-sys"
2229 | version = "0.3.60"
2230 | source = "registry+https://github.com/rust-lang/crates.io-index"
2231 | checksum = "bcda906d8be16e728fd5adc5b729afad4e444e106ab28cd1c7256e54fa61510f"
2232 | dependencies = [
2233 |  "js-sys",
2234 |  "wasm-bindgen",
2235 | ]
2236 | 
2237 | [[package]]
2238 | name = "wgpu"
2239 | version = "0.14.0"
2240 | source = "registry+https://github.com/rust-lang/crates.io-index"
2241 | checksum = "c2272b17bffc8a0c7d53897435da7c1db587c87d3a14e8dae9cdb8d1d210fc0f"
2242 | dependencies = [
2243 |  "arrayvec 0.7.2",
2244 |  "js-sys",
2245 |  "log",
2246 |  "naga",
2247 |  "parking_lot 0.12.1",
2248 |  "raw-window-handle 0.5.0",
2249 |  "smallvec",
2250 |  "static_assertions",
2251 |  "wasm-bindgen",
2252 |  "wasm-bindgen-futures",
2253 |  "web-sys",
2254 |  "wgpu-core",
2255 |  "wgpu-hal",
2256 |  "wgpu-types",
2257 | ]
2258 | 
2259 | [[package]]
2260 | name = "wgpu-core"
2261 | version = "0.14.0"
2262 | source = "registry+https://github.com/rust-lang/crates.io-index"
2263 | checksum = "73d14cad393054caf992ee02b7da6a372245d39a484f7461c1f44f6f6359bd28"
2264 | dependencies = [
2265 |  "arrayvec 0.7.2",
2266 |  "bit-vec",
2267 |  "bitflags",
2268 |  "cfg_aliases",
2269 |  "codespan-reporting",
2270 |  "fxhash",
2271 |  "log",
2272 |  "naga",
2273 |  "parking_lot 0.12.1",
2274 |  "profiling",
2275 |  "raw-window-handle 0.5.0",
2276 |  "smallvec",
2277 |  "thiserror",
2278 |  "web-sys",
2279 |  "wgpu-hal",
2280 |  "wgpu-types",
2281 | ]
2282 | 
2283 | [[package]]
2284 | name = "wgpu-hal"
2285 | version = "0.14.1"
2286 | source = "registry+https://github.com/rust-lang/crates.io-index"
2287 | checksum = "3cc320a61acb26be4f549c9b1b53405c10a223fbfea363ec39474c32c348d12f"
2288 | dependencies = [
2289 |  "android_system_properties",
2290 |  "arrayvec 0.7.2",
2291 |  "ash",
2292 |  "bit-set",
2293 |  "bitflags",
2294 |  "block",
2295 |  "core-graphics-types",
2296 |  "d3d12",
2297 |  "foreign-types 0.3.2",
2298 |  "fxhash",
2299 |  "glow",
2300 |  "gpu-alloc",
2301 |  "gpu-descriptor",
2302 |  "js-sys",
2303 |  "khronos-egl",
2304 |  "libloading",
2305 |  "log",
2306 |  "metal",
2307 |  "naga",
2308 |  "objc",
2309 |  "parking_lot 0.12.1",
2310 |  "profiling",
2311 |  "range-alloc",
2312 |  "raw-window-handle 0.5.0",
2313 |  "renderdoc-sys",
2314 |  "smallvec",
2315 |  "thiserror",
2316 |  "wasm-bindgen",
2317 |  "web-sys",
2318 |  "wgpu-types",
2319 |  "winapi",
2320 | ]
2321 | 
2322 | [[package]]
2323 | name = "wgpu-types"
2324 | version = "0.14.1"
2325 | source = "registry+https://github.com/rust-lang/crates.io-index"
2326 | checksum = "fb6b28ef22cac17b9109b25b3bf8c9a103eeb293d7c5f78653979b09140375f6"
2327 | dependencies = [
2328 |  "bitflags",
2329 | ]
2330 | 
2331 | [[package]]
2332 | name = "wgpu_glyph"
2333 | version = "0.18.0"
2334 | source = "registry+https://github.com/rust-lang/crates.io-index"
2335 | checksum = "0cafb82773e0f124a33674dab5de4dff73175aeb921949047ab014efb58fb446"
2336 | dependencies = [
2337 |  "bytemuck",
2338 |  "glyph_brush",
2339 |  "log",
2340 |  "wgpu",
2341 | ]
2342 | 
2343 | [[package]]
2344 | name = "winapi"
2345 | version = "0.3.9"
2346 | source = "registry+https://github.com/rust-lang/crates.io-index"
2347 | checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
2348 | dependencies = [
2349 |  "winapi-i686-pc-windows-gnu",
2350 |  "winapi-x86_64-pc-windows-gnu",
2351 | ]
2352 | 
2353 | [[package]]
2354 | name = "winapi-i686-pc-windows-gnu"
2355 | version = "0.4.0"
2356 | source = "registry+https://github.com/rust-lang/crates.io-index"
2357 | checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
2358 | 
2359 | [[package]]
2360 | name = "winapi-util"
2361 | version = "0.1.5"
2362 | source = "registry+https://github.com/rust-lang/crates.io-index"
2363 | checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
2364 | dependencies = [
2365 |  "winapi",
2366 | ]
2367 | 
2368 | [[package]]
2369 | name = "winapi-wsapoll"
2370 | version = "0.1.1"
2371 | source = "registry+https://github.com/rust-lang/crates.io-index"
2372 | checksum = "44c17110f57155602a80dca10be03852116403c9ff3cd25b079d666f2aa3df6e"
2373 | dependencies = [
2374 |  "winapi",
2375 | ]
2376 | 
2377 | [[package]]
2378 | name = "winapi-x86_64-pc-windows-gnu"
2379 | version = "0.4.0"
2380 | source = "registry+https://github.com/rust-lang/crates.io-index"
2381 | checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
2382 | 
2383 | [[package]]
2384 | name = "window_clipboard"
2385 | version = "0.2.3"
2386 | source = "registry+https://github.com/rust-lang/crates.io-index"
2387 | checksum = "b47d7fb4df5cd1fea61e5ee3841380f54359bac814e227d8f72709f4f193f8cf"
2388 | dependencies = [
2389 |  "clipboard-win",
2390 |  "clipboard_macos",
2391 |  "clipboard_wayland",
2392 |  "clipboard_x11",
2393 |  "raw-window-handle 0.3.4",
2394 |  "thiserror",
2395 | ]
2396 | 
2397 | [[package]]
2398 | name = "windows-sys"
2399 | version = "0.36.1"
2400 | source = "registry+https://github.com/rust-lang/crates.io-index"
2401 | checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
2402 | dependencies = [
2403 |  "windows_aarch64_msvc",
2404 |  "windows_i686_gnu",
2405 |  "windows_i686_msvc",
2406 |  "windows_x86_64_gnu",
2407 |  "windows_x86_64_msvc",
2408 | ]
2409 | 
2410 | [[package]]
2411 | name = "windows_aarch64_msvc"
2412 | version = "0.36.1"
2413 | source = "registry+https://github.com/rust-lang/crates.io-index"
2414 | checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
2415 | 
2416 | [[package]]
2417 | name = "windows_i686_gnu"
2418 | version = "0.36.1"
2419 | source = "registry+https://github.com/rust-lang/crates.io-index"
2420 | checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
2421 | 
2422 | [[package]]
2423 | name = "windows_i686_msvc"
2424 | version = "0.36.1"
2425 | source = "registry+https://github.com/rust-lang/crates.io-index"
2426 | checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
2427 | 
2428 | [[package]]
2429 | name = "windows_x86_64_gnu"
2430 | version = "0.36.1"
2431 | source = "registry+https://github.com/rust-lang/crates.io-index"
2432 | checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
2433 | 
2434 | [[package]]
2435 | name = "windows_x86_64_msvc"
2436 | version = "0.36.1"
2437 | source = "registry+https://github.com/rust-lang/crates.io-index"
2438 | checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
2439 | 
2440 | [[package]]
2441 | name = "winit"
2442 | version = "0.27.2"
2443 | source = "git+https://github.com/iced-rs/winit.git?rev=940457522e9fb9f5dac228b0ecfafe0138b4048c#940457522e9fb9f5dac228b0ecfafe0138b4048c"
2444 | dependencies = [
2445 |  "bitflags",
2446 |  "cocoa",
2447 |  "core-foundation",
2448 |  "core-graphics",
2449 |  "dispatch",
2450 |  "instant",
2451 |  "libc",
2452 |  "log",
2453 |  "mio",
2454 |  "ndk",
2455 |  "ndk-glue",
2456 |  "objc",
2457 |  "once_cell",
2458 |  "parking_lot 0.12.1",
2459 |  "percent-encoding",
2460 |  "raw-window-handle 0.4.3",
2461 |  "raw-window-handle 0.5.0",
2462 |  "sctk-adwaita",
2463 |  "smithay-client-toolkit",
2464 |  "wasm-bindgen",
2465 |  "wayland-client",
2466 |  "wayland-protocols",
2467 |  "web-sys",
2468 |  "windows-sys",
2469 |  "x11-dl",
2470 | ]
2471 | 
2472 | [[package]]
2473 | name = "wio"
2474 | version = "0.2.2"
2475 | source = "registry+https://github.com/rust-lang/crates.io-index"
2476 | checksum = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
2477 | dependencies = [
2478 |  "winapi",
2479 | ]
2480 | 
2481 | [[package]]
2482 | name = "x11-dl"
2483 | version = "2.20.0"
2484 | source = "registry+https://github.com/rust-lang/crates.io-index"
2485 | checksum = "0c83627bc137605acc00bb399c7b908ef460b621fc37c953db2b09f88c449ea6"
2486 | dependencies = [
2487 |  "lazy_static",
2488 |  "libc",
2489 |  "pkg-config",
2490 | ]
2491 | 
2492 | [[package]]
2493 | name = "x11rb"
2494 | version = "0.9.0"
2495 | source = "registry+https://github.com/rust-lang/crates.io-index"
2496 | checksum = "6e99be55648b3ae2a52342f9a870c0e138709a3493261ce9b469afe6e4df6d8a"
2497 | dependencies = [
2498 |  "gethostname",
2499 |  "nix 0.22.3",
2500 |  "winapi",
2501 |  "winapi-wsapoll",
2502 | ]
2503 | 
2504 | [[package]]
2505 | name = "xcursor"
2506 | version = "0.3.4"
2507 | source = "registry+https://github.com/rust-lang/crates.io-index"
2508 | checksum = "463705a63313cd4301184381c5e8042f0a7e9b4bb63653f216311d4ae74690b7"
2509 | dependencies = [
2510 |  "nom",
2511 | ]
2512 | 
2513 | [[package]]
2514 | name = "xi-unicode"
2515 | version = "0.3.0"
2516 | source = "registry+https://github.com/rust-lang/crates.io-index"
2517 | checksum = "a67300977d3dc3f8034dae89778f502b6ba20b269527b3223ba59c0cf393bb8a"
2518 | 
2519 | [[package]]
2520 | name = "xml-rs"
2521 | version = "0.8.4"
2522 | source = "registry+https://github.com/rust-lang/crates.io-index"
2523 | checksum = "d2d7d3948613f75c98fd9328cfdcc45acc4d360655289d0a7d4ec931392200a3"
2524 | 


--------------------------------------------------------------------------------
/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "iced_graph_editor"
 3 | version = "0.1.0"
 4 | edition = "2021"
 5 | 
 6 | [workspace]
 7 | members = [
 8 |     ".",
 9 |     "example",
10 | ]
11 | default-members = ["example"]
12 | 
13 | [dependencies]
14 | iced_core = { git = "https://github.com/tarkah/iced.git", branch = "feat/primitive-scale" }
15 | iced_graphics = { git = "https://github.com/tarkah/iced.git", branch = "feat/primitive-scale" }
16 | iced_native = { git = "https://github.com/tarkah/iced.git", branch = "feat/primitive-scale" }
17 | iced_style = { git = "https://github.com/tarkah/iced.git", branch = "feat/primitive-scale" }
18 | 
19 | glam = "0.21.3"
20 | 


--------------------------------------------------------------------------------
/example/Cargo.toml:
--------------------------------------------------------------------------------
 1 | [package]
 2 | name = "example"
 3 | version = "0.1.0"
 4 | edition = "2021"
 5 | 
 6 | [dependencies]
 7 | iced_graph_editor = { path = "../" }
 8 | 
 9 | iced = { git = "https://github.com/tarkah/iced.git", branch = "feat/primitive-scale", features=["canvas"] }
10 | 


--------------------------------------------------------------------------------
/example/src/main.rs:
--------------------------------------------------------------------------------
  1 | use iced::widget::{button, column, container, text};
  2 | use iced::{executor, theme, Application, Command, Element, Length, Settings, Theme, Vector};
  3 | 
  4 | use iced_graph_editor::widget::graph;
  5 | use iced_graph_editor::widget::graph::editor;
  6 | 
  7 | use self::node::Node;
  8 | 
  9 | mod node;
 10 | 
 11 | fn main() {
 12 |     App::run(Settings {
 13 |         antialiasing: true,
 14 |         ..Default::default()
 15 |     })
 16 |     .unwrap()
 17 | }
 18 | 
 19 | #[derive(Debug, Clone, Copy)]
 20 | enum Message {
 21 |     Graph(editor::Event),
 22 |     ToggleTheme,
 23 |     DeleteNode(usize),
 24 | }
 25 | 
 26 | struct App {
 27 |     nodes: Vec<Node>,
 28 |     scaling: f32,
 29 |     translation: Vector,
 30 |     theme: Theme,
 31 | }
 32 | 
 33 | impl Application for App {
 34 |     type Executor = executor::Default;
 35 |     type Theme = Theme;
 36 |     type Message = Message;
 37 |     type Flags = ();
 38 | 
 39 |     fn new(_flags: Self::Flags) -> (Self, Command<Self::Message>) {
 40 |         let nodes = vec![
 41 |             Node {
 42 |                 kind: node::Kind::A,
 43 |                 offset: Vector::new(50.0, 50.0),
 44 |                 edges: vec![1],
 45 |             },
 46 |             Node {
 47 |                 kind: node::Kind::B,
 48 |                 offset: Vector::new(150.0, 100.0),
 49 |                 edges: vec![2, 3],
 50 |             },
 51 |             Node {
 52 |                 kind: node::Kind::C,
 53 |                 offset: Vector::new(350.0, 25.0),
 54 |                 edges: vec![3],
 55 |             },
 56 |             Node {
 57 |                 kind: node::Kind::D,
 58 |                 offset: Vector::new(500.0, 200.0),
 59 |                 edges: vec![],
 60 |             },
 61 |         ];
 62 | 
 63 |         (
 64 |             App {
 65 |                 nodes,
 66 |                 scaling: 1.0,
 67 |                 translation: Vector::new(0.0, 0.0),
 68 |                 theme: Theme::Light,
 69 |             },
 70 |             Command::none(),
 71 |         )
 72 |     }
 73 | 
 74 |     fn title(&self) -> String {
 75 |         "Iced Graph Editor".into()
 76 |     }
 77 | 
 78 |     fn theme(&self) -> Theme {
 79 |         self.theme.clone()
 80 |     }
 81 | 
 82 |     fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
 83 |         match message {
 84 |             Message::Graph(event) => match event {
 85 |                 editor::Event::NodeMoved { index, offset } => {
 86 |                     self.nodes[index].offset = offset;
 87 | 
 88 |                     Command::none()
 89 |                 }
 90 |                 editor::Event::Scaled(scaling, translation) => {
 91 |                     self.scaling = scaling;
 92 |                     self.translation = translation;
 93 | 
 94 |                     Command::none()
 95 |                 }
 96 |                 editor::Event::Translated(translation) => {
 97 |                     self.translation = translation;
 98 | 
 99 |                     Command::none()
100 |                 }
101 |             },
102 |             Message::ToggleTheme => {
103 |                 match &self.theme {
104 |                     Theme::Light => self.theme = Theme::Dark,
105 |                     Theme::Dark => self.theme = Theme::Light,
106 |                     Theme::Custom(_) => {}
107 |                 }
108 | 
109 |                 Command::none()
110 |             }
111 |             Message::DeleteNode(index) => {
112 |                 self.nodes.remove(index);
113 |                 self.nodes.iter_mut().for_each(|node| {
114 |                     node.edges = std::mem::take(&mut node.edges)
115 |                         .into_iter()
116 |                         .filter(|i| *i != index)
117 |                         .map(|i| if i > index { i - 1 } else { i })
118 |                         .collect();
119 |                 });
120 | 
121 |                 Command::none()
122 |             }
123 |         }
124 |     }
125 | 
126 |     fn view(&self) -> Element<Message> {
127 |         let node_content = |kind: node::Kind| -> Element<_> {
128 |             match kind {
129 |                 node::Kind::A => text("Node A").into(),
130 |                 node::Kind::B => column![text("Node B"), text("Some description...")]
131 |                     .spacing(5)
132 |                     .into(),
133 |                 node::Kind::C => column![
134 |                     text("Node C"),
135 |                     button(text("Delete")).on_press(Message::DeleteNode(2))
136 |                 ]
137 |                 .spacing(5)
138 |                 .into(),
139 |                 node::Kind::D => column![
140 |                     text("Node D"),
141 |                     button(text("Toggle Theme")).on_press(Message::ToggleTheme)
142 |                 ]
143 |                 .spacing(5)
144 |                 .into(),
145 |             }
146 |         };
147 | 
148 |         let nodes = self
149 |             .nodes
150 |             .iter()
151 |             .map(|node| graph::Node::new(node_content(node.kind), node.offset, node.edges.clone()))
152 |             .collect();
153 | 
154 |         container(
155 |             container(
156 |                 graph::Editor::new(nodes, Message::Graph)
157 |                     .scaling(self.scaling)
158 |                     .translation(self.translation),
159 |             )
160 |             .width(Length::Fill)
161 |             .height(Length::Fill)
162 |             .style(theme::Container::Box),
163 |         )
164 |         .padding(50)
165 |         .width(Length::Fill)
166 |         .height(Length::Fill)
167 |         .into()
168 |     }
169 | }
170 | 


--------------------------------------------------------------------------------
/example/src/node.rs:
--------------------------------------------------------------------------------
 1 | use iced::Vector;
 2 | 
 3 | #[derive(Debug, Clone, Copy)]
 4 | pub enum Kind {
 5 |     A,
 6 |     B,
 7 |     C,
 8 |     D,
 9 | }
10 | 
11 | #[derive(Debug, Clone)]
12 | pub struct Node {
13 |     pub kind: Kind,
14 |     pub offset: Vector,
15 |     pub edges: Vec<usize>,
16 | }
17 | 


--------------------------------------------------------------------------------
/rustfmt.toml:
--------------------------------------------------------------------------------
1 | unstable_features = true
2 | imports_granularity = "Module"
3 | group_imports = "StdExternalCrate"
4 | 


--------------------------------------------------------------------------------
/src/lib.rs:
--------------------------------------------------------------------------------
1 | pub mod theme;
2 | pub mod widget;
3 | 


--------------------------------------------------------------------------------
/src/theme.rs:
--------------------------------------------------------------------------------
 1 | use iced_style::Theme;
 2 | 
 3 | use crate::widget::graph::{editor, node};
 4 | 
 5 | #[derive(Debug, Clone, Copy, Default)]
 6 | pub enum Node {
 7 |     #[default]
 8 |     Default,
 9 | }
10 | 
11 | impl node::StyleSheet for Theme {
12 |     type Style = Node;
13 | 
14 |     fn appearance(&self, style: Self::Style) -> node::Appearance {
15 |         match style {
16 |             Node::Default => node::Appearance {
17 |                 text_color: Some(self.palette().text),
18 |                 background: Some(self.palette().background.into()),
19 |                 border_radius: 3.0,
20 |                 border_width: 1.0,
21 |                 border_color: self.extended_palette().background.strong.color,
22 |             },
23 |         }
24 |     }
25 | }
26 | 
27 | #[derive(Debug, Clone, Copy, Default)]
28 | pub enum Editor {
29 |     #[default]
30 |     Default,
31 | }
32 | 
33 | impl editor::StyleSheet for Theme {
34 |     type Style = Node;
35 | 
36 |     fn appearance(&self, style: Self::Style) -> editor::Appearance {
37 |         match style {
38 |             Node::Default => editor::Appearance {
39 |                 background: Some(self.extended_palette().background.weak.color.into()),
40 |                 border_radius: 0.0,
41 |                 border_width: 1.0,
42 |                 border_color: self.extended_palette().background.strong.color,
43 |                 connector_width: 2.0,
44 |                 connector_color: self.palette().text,
45 |             },
46 |         }
47 |     }
48 | }
49 | 


--------------------------------------------------------------------------------
/src/widget.rs:
--------------------------------------------------------------------------------
1 | pub mod graph;
2 | pub use graph::Editor;
3 | 


--------------------------------------------------------------------------------
/src/widget/graph.rs:
--------------------------------------------------------------------------------
1 | pub mod editor;
2 | pub mod node;
3 | 
4 | pub use editor::Editor;
5 | pub use node::Node;
6 | 


--------------------------------------------------------------------------------
/src/widget/graph/editor.rs:
--------------------------------------------------------------------------------
  1 | use iced_core::{Background, Color, Length, Point, Rectangle, Size, Vector};
  2 | use iced_graphics::{Renderer, Transformation};
  3 | use iced_native::widget::{tree, Tree};
  4 | use iced_native::{
  5 |     event, keyboard, layout, mouse, renderer, Element, Layout, Renderer as _, Widget,
  6 | };
  7 | 
  8 | use super::{node, Node};
  9 | 
 10 | #[derive(Debug, Clone, Copy)]
 11 | pub enum Event {
 12 |     NodeMoved { index: usize, offset: Vector },
 13 |     Scaled(f32, Vector),
 14 |     Translated(Vector),
 15 | }
 16 | 
 17 | #[derive(Debug, Clone, Copy, Default)]
 18 | enum Interaction {
 19 |     #[default]
 20 |     Idle,
 21 |     Translating {
 22 |         started_at: Point,
 23 |         offset: Vector,
 24 |     },
 25 | }
 26 | 
 27 | impl Interaction {
 28 |     fn offset(&self) -> Vector {
 29 |         match self {
 30 |             Interaction::Idle => Vector::default(),
 31 |             Interaction::Translating { offset, .. } => *offset,
 32 |         }
 33 |     }
 34 | }
 35 | 
 36 | pub struct Editor<'a, Message, Renderer>
 37 | where
 38 |     Renderer: iced_native::Renderer,
 39 |     Renderer::Theme: StyleSheet + node::StyleSheet,
 40 | {
 41 |     nodes: Vec<Node<'a, Message, Renderer>>,
 42 |     scaling: f32,
 43 |     translation: Vector,
 44 |     max_node_size: Size,
 45 |     on_event: Box<dyn Fn(Event) -> Message + 'a>,
 46 |     style: <Renderer::Theme as StyleSheet>::Style,
 47 | }
 48 | 
 49 | impl<'a, Message, Renderer> Editor<'a, Message, Renderer>
 50 | where
 51 |     Renderer: iced_native::Renderer,
 52 |     Renderer::Theme: StyleSheet + node::StyleSheet,
 53 | {
 54 |     const MIN_SCALING: f32 = 0.1;
 55 |     const MAX_SCALING: f32 = 5.0;
 56 | 
 57 |     pub fn new(
 58 |         nodes: Vec<Node<'a, Message, Renderer>>,
 59 |         on_event: impl Fn(Event) -> Message + 'a,
 60 |     ) -> Self {
 61 |         Self {
 62 |             nodes,
 63 |             scaling: 1.0,
 64 |             translation: Vector::new(0.0, 0.0),
 65 |             max_node_size: Size::new(300.0, 300.0),
 66 |             on_event: Box::new(on_event),
 67 |             style: Default::default(),
 68 |         }
 69 |     }
 70 | 
 71 |     pub fn style(self, style: impl Into<<Renderer::Theme as StyleSheet>::Style>) -> Self {
 72 |         Self {
 73 |             style: style.into(),
 74 |             ..self
 75 |         }
 76 |     }
 77 | 
 78 |     pub fn scaling(self, scaling: f32) -> Self {
 79 |         Self { scaling, ..self }
 80 |     }
 81 | 
 82 |     pub fn translation(self, translation: Vector) -> Self {
 83 |         Self {
 84 |             translation,
 85 |             ..self
 86 |         }
 87 |     }
 88 | 
 89 |     fn transformation(&self) -> glam::Mat4 {
 90 |         (Transformation::identity()
 91 |             * Transformation::scale(self.scaling, self.scaling)
 92 |             * Transformation::translate(self.translation.x, self.translation.y))
 93 |         .into()
 94 |     }
 95 | 
 96 |     fn transform_cursor(&self, cursor_position: Point) -> Point {
 97 |         let Point { x, y } = cursor_position;
 98 | 
 99 |         let glam::Vec3 { x, y, .. } = self
100 |             .transformation()
101 |             .inverse()
102 |             .transform_point3(glam::Vec3::new(x, y, 1.0));
103 | 
104 |         Point::new(x, y)
105 |     }
106 | 
107 |     fn zoom(&mut self, y: f32, position: Point) {
108 |         let old_scaling = self.scaling;
109 | 
110 |         self.scaling = (self.scaling * (1.0 + y / 15.0))
111 |             .max(Self::MIN_SCALING)
112 |             .min(Self::MAX_SCALING);
113 | 
114 |         let change = self.scaling / old_scaling - 1.0;
115 | 
116 |         self.translation =
117 |             self.translation - Vector::new(position.x, position.y) * change * (1.0 / self.scaling);
118 |     }
119 | 
120 |     fn reset_zoom(&mut self, position: Point) {
121 |         let old_scaling = self.scaling;
122 | 
123 |         self.scaling = 1.0;
124 | 
125 |         let change = self.scaling / old_scaling - 1.0;
126 | 
127 |         self.translation =
128 |             self.translation - Vector::new(position.x, position.y) * change * (1.0 / self.scaling);
129 |     }
130 | }
131 | 
132 | impl<'a, Message, Backend, Theme> Widget<Message, Renderer<Backend, Theme>>
133 |     for Editor<'a, Message, Renderer<Backend, Theme>>
134 | where
135 |     Backend: iced_graphics::Backend,
136 |     Theme: StyleSheet + node::StyleSheet,
137 | {
138 |     fn tag(&self) -> tree::Tag {
139 |         tree::Tag::of::<Interaction>()
140 |     }
141 | 
142 |     fn state(&self) -> tree::State {
143 |         tree::State::new(Interaction::default())
144 |     }
145 | 
146 |     fn children(&self) -> Vec<Tree> {
147 |         self.nodes
148 |             .iter()
149 |             .map(|node| Tree {
150 |                 tag: node.tag(),
151 |                 state: node.state(),
152 |                 children: node.children(),
153 |             })
154 |             .collect()
155 |     }
156 | 
157 |     fn diff(&self, tree: &mut Tree) {
158 |         tree.diff_children_custom(
159 |             &self.nodes,
160 |             |state, node| node.diff(state),
161 |             |node| Tree {
162 |                 tag: node.tag(),
163 |                 state: node.state(),
164 |                 children: node.children(),
165 |             },
166 |         )
167 |     }
168 | 
169 |     fn width(&self) -> Length {
170 |         Length::Fill
171 |     }
172 | 
173 |     fn height(&self) -> Length {
174 |         Length::Fill
175 |     }
176 | 
177 |     fn layout(&self, renderer: &Renderer<Backend, Theme>, limits: &layout::Limits) -> layout::Node {
178 |         layout::Node::with_children(
179 |             limits.fill(),
180 |             self.nodes
181 |                 .iter()
182 |                 .map(|node| {
183 |                     node.layout(
184 |                         renderer,
185 |                         &layout::Limits::new(Size::ZERO, self.max_node_size),
186 |                     )
187 |                 })
188 |                 .collect(),
189 |         )
190 |     }
191 | 
192 |     fn on_event(
193 |         &mut self,
194 |         tree: &mut Tree,
195 |         event: iced_native::Event,
196 |         layout: Layout<'_>,
197 |         cursor_position: Point,
198 |         renderer: &Renderer<Backend, Theme>,
199 |         clipboard: &mut dyn iced_native::Clipboard,
200 |         shell: &mut iced_native::Shell<'_, Message>,
201 |     ) -> event::Status {
202 |         let interaction = tree.state.downcast_mut::<Interaction>();
203 | 
204 |         let bounds = layout.bounds();
205 |         let contains_cursor = bounds.contains(cursor_position);
206 | 
207 |         let transformed_cursor = self.transform_cursor(cursor_position);
208 | 
209 |         let status = self
210 |             .nodes
211 |             .iter_mut()
212 |             .zip(&mut tree.children)
213 |             .zip(layout.children())
214 |             .enumerate()
215 |             .map(|(index, ((node, state), layout))| {
216 |                 node.on_event(
217 |                     state,
218 |                     event.clone(),
219 |                     layout,
220 |                     transformed_cursor,
221 |                     renderer,
222 |                     clipboard,
223 |                     shell,
224 |                     index,
225 |                     &self.on_event,
226 |                 )
227 |             })
228 |             .fold(event::Status::Ignored, event::Status::merge);
229 | 
230 |         if matches!(status, event::Status::Ignored) && contains_cursor {
231 |             match event {
232 |                 event::Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
233 |                     *interaction = Interaction::Translating {
234 |                         started_at: cursor_position,
235 |                         offset: Vector::default(),
236 |                     };
237 |                     return event::Status::Captured;
238 |                 }
239 |                 event::Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left)) => {
240 |                     if let Interaction::Translating { offset, .. } = interaction {
241 |                         shell.publish((self.on_event)(Event::Translated(
242 |                             self.translation + *offset,
243 |                         )));
244 | 
245 |                         *interaction = Interaction::Idle;
246 |                         return event::Status::Captured;
247 |                     }
248 |                 }
249 |                 event::Event::Mouse(mouse::Event::CursorMoved { position }) => {
250 |                     if let Interaction::Translating { started_at, offset } = interaction {
251 |                         *offset = (position - *started_at) * (1.0 / self.scaling);
252 |                         return event::Status::Captured;
253 |                     }
254 |                 }
255 |                 event::Event::Mouse(mouse::Event::WheelScrolled { delta }) => match delta {
256 |                     mouse::ScrollDelta::Lines { y, .. } | mouse::ScrollDelta::Pixels { y, .. } => {
257 |                         if y < 0.0 && self.scaling > Self::MIN_SCALING
258 |                             || y > 0.0 && self.scaling < Self::MAX_SCALING
259 |                         {
260 |                             self.zoom(y, cursor_position);
261 | 
262 |                             shell.publish((self.on_event)(Event::Scaled(
263 |                                 self.scaling,
264 |                                 self.translation,
265 |                             )));
266 | 
267 |                             return event::Status::Captured;
268 |                         }
269 |                     }
270 |                 },
271 |                 event::Event::Keyboard(keyboard::Event::KeyPressed {
272 |                     key_code: keyboard::KeyCode::Minus,
273 |                     ..
274 |                 }) => {
275 |                     self.zoom(-1.0, bounds.position());
276 | 
277 |                     shell.publish((self.on_event)(Event::Scaled(
278 |                         self.scaling,
279 |                         self.translation,
280 |                     )));
281 | 
282 |                     return event::Status::Captured;
283 |                 }
284 |                 event::Event::Keyboard(keyboard::Event::KeyPressed {
285 |                     key_code: keyboard::KeyCode::Equals,
286 |                     ..
287 |                 }) => {
288 |                     self.zoom(1.0, bounds.position());
289 | 
290 |                     shell.publish((self.on_event)(Event::Scaled(
291 |                         self.scaling,
292 |                         self.translation,
293 |                     )));
294 | 
295 |                     return event::Status::Captured;
296 |                 }
297 |                 event::Event::Keyboard(keyboard::Event::KeyPressed {
298 |                     key_code: keyboard::KeyCode::Key0,
299 |                     ..
300 |                 }) => {
301 |                     self.reset_zoom(bounds.position());
302 | 
303 |                     shell.publish((self.on_event)(Event::Scaled(
304 |                         self.scaling,
305 |                         self.translation,
306 |                     )));
307 | 
308 |                     return event::Status::Captured;
309 |                 }
310 |                 event::Event::Keyboard(keyboard::Event::KeyPressed {
311 |                     key_code: keyboard::KeyCode::Space,
312 |                     ..
313 |                 }) => {
314 |                     let factor = self.scaling - 1.0;
315 | 
316 |                     self.translation = Vector::default()
317 |                         - Vector::new(
318 |                             bounds.x * factor / self.scaling,
319 |                             bounds.y * factor / self.scaling,
320 |                         );
321 | 
322 |                     shell.publish((self.on_event)(Event::Translated(self.translation)));
323 | 
324 |                     return event::Status::Captured;
325 |                 }
326 |                 _ => {}
327 |             }
328 | 
329 |             event::Status::Ignored
330 |         } else {
331 |             status
332 |         }
333 |     }
334 | 
335 |     fn draw(
336 |         &self,
337 |         tree: &Tree,
338 |         renderer: &mut Renderer<Backend, Theme>,
339 |         theme: &Theme,
340 |         style: &renderer::Style,
341 |         layout: Layout<'_>,
342 |         cursor_position: Point,
343 |         viewport: &Rectangle,
344 |     ) {
345 |         let interaction = tree.state.downcast_ref::<Interaction>();
346 | 
347 |         let transformed_cursor = self.transform_cursor(cursor_position);
348 | 
349 |         let appearance = <Theme as StyleSheet>::appearance(theme, self.style);
350 | 
351 |         renderer.fill_quad(
352 |             renderer::Quad {
353 |                 bounds: layout.bounds(),
354 |                 border_width: appearance.border_width,
355 |                 border_color: appearance.border_color,
356 |                 border_radius: appearance.border_radius,
357 |             },
358 |             appearance
359 |                 .background
360 |                 .unwrap_or_else(|| Color::TRANSPARENT.into()),
361 |         );
362 | 
363 |         let pad = |rect: Rectangle, padding: f32| Rectangle {
364 |             x: rect.x + padding,
365 |             y: rect.y + padding,
366 |             width: rect.width - padding * 2.0,
367 |             height: rect.height - padding * 2.0,
368 |         };
369 | 
370 |         let padded_bounds = pad(layout.bounds(), 1.0);
371 | 
372 |         renderer.with_layer(padded_bounds, |renderer| {
373 |             renderer.with_translation(self.translation + interaction.offset(), |renderer| {
374 |                 renderer.with_scale(self.scaling, |renderer| {
375 |                     self.nodes
376 |                         .iter()
377 |                         .zip(&tree.children)
378 |                         .zip(layout.children())
379 |                         .for_each(|((node, state), layout)| {
380 |                             node.draw(
381 |                                 state,
382 |                                 renderer,
383 |                                 theme,
384 |                                 style,
385 |                                 layout,
386 |                                 transformed_cursor,
387 |                                 viewport,
388 |                             )
389 |                         });
390 |                 });
391 |             });
392 | 
393 |             let frame_offset = Vector::new(padded_bounds.x, padded_bounds.y);
394 |             renderer.with_translation(frame_offset, |renderer| {
395 |                 use iced_graphics::widget::canvas::{Frame, Path, Stroke};
396 | 
397 |                 self.nodes
398 |                     .iter()
399 |                     .enumerate()
400 |                     .for_each(|(from_index, from)| {
401 |                         for to_index in from.edges.iter().copied() {
402 |                             if self.nodes.get(to_index).is_some() {
403 |                                 let from_state = tree
404 |                                     .children
405 |                                     .get(from_index)
406 |                                     .unwrap()
407 |                                     .state
408 |                                     .downcast_ref::<node::State>();
409 |                                 let to_state = tree
410 |                                     .children
411 |                                     .get(to_index)
412 |                                     .unwrap()
413 |                                     .state
414 |                                     .downcast_ref::<node::State>();
415 | 
416 |                                 let from_bounds = from_state.adjusted_bounds(
417 |                                     layout.children().nth(from_index).unwrap().bounds(),
418 |                                 );
419 |                                 let to_bounds = to_state.adjusted_bounds(
420 |                                     layout.children().nth(to_index).unwrap().bounds(),
421 |                                 );
422 | 
423 |                                 let mut frame = Frame::new(padded_bounds.size());
424 | 
425 |                                 let transform_point = |point: Point| {
426 |                                     let translated =
427 |                                         point + self.translation + interaction.offset();
428 | 
429 |                                     Point {
430 |                                         x: translated.x * self.scaling,
431 |                                         y: translated.y * self.scaling,
432 |                                     } - frame_offset
433 |                                 };
434 | 
435 |                                 let start_untransformed = Point {
436 |                                     x: (from_bounds.x + from_bounds.width),
437 |                                     y: from_bounds.center_y(),
438 |                                 };
439 |                                 let start = transform_point(start_untransformed);
440 |                                 let end_untransformed = Point {
441 |                                     x: to_bounds.x,
442 |                                     y: to_bounds.center_y(),
443 |                                 };
444 |                                 let end = transform_point(end_untransformed);
445 | 
446 |                                 let path = Path::new(|p| {
447 |                                     let control_scale =
448 |                                         ((end_untransformed.x - start_untransformed.x) / 2.0)
449 |                                             .max(30.0)
450 |                                             * self.scaling;
451 |                                     let control_a = Point {
452 |                                         x: start.x + control_scale,
453 |                                         y: start.y,
454 |                                     };
455 |                                     let control_b = Point {
456 |                                         x: end.x - control_scale,
457 |                                         y: end.y,
458 |                                     };
459 | 
460 |                                     p.move_to(start);
461 |                                     p.bezier_curve_to(control_a, control_b, end);
462 |                                 });
463 | 
464 |                                 frame.stroke(
465 |                                     &path,
466 |                                     Stroke::default()
467 |                                         .with_width(appearance.connector_width * self.scaling)
468 |                                         .with_color(appearance.connector_color),
469 |                                 );
470 | 
471 |                                 let primitive = frame.into_geometry().into_primitive();
472 |                                 renderer.draw_primitive(primitive);
473 |                             }
474 |                         }
475 |                     });
476 |             });
477 |         });
478 |     }
479 | 
480 |     fn mouse_interaction(
481 |         &self,
482 |         tree: &Tree,
483 |         layout: Layout<'_>,
484 |         cursor_position: Point,
485 |         viewport: &Rectangle,
486 |         renderer: &Renderer<Backend, Theme>,
487 |     ) -> iced_native::mouse::Interaction {
488 |         let transformed_cursor = self.transform_cursor(cursor_position);
489 | 
490 |         self.nodes
491 |             .iter()
492 |             .zip(&tree.children)
493 |             .zip(layout.children())
494 |             .map(|((node, state), layout)| {
495 |                 node.mouse_interaction(state, layout, transformed_cursor, viewport, renderer)
496 |             })
497 |             .max()
498 |             .unwrap_or_default()
499 |     }
500 | }
501 | 
502 | impl<'a, Message, Backend, Theme> From<Editor<'a, Message, Renderer<Backend, Theme>>>
503 |     for Element<'a, Message, Renderer<Backend, Theme>>
504 | where
505 |     Backend: iced_graphics::Backend + 'a,
506 |     Theme: StyleSheet + node::StyleSheet + 'a,
507 |     Message: 'a,
508 | {
509 |     fn from(editor: Editor<'a, Message, Renderer<Backend, Theme>>) -> Self {
510 |         Element::new(editor)
511 |     }
512 | }
513 | 
514 | #[derive(Debug, Clone, Copy)]
515 | pub struct Appearance {
516 |     pub background: Option<Background>,
517 |     pub border_radius: f32,
518 |     pub border_width: f32,
519 |     pub border_color: Color,
520 |     pub connector_width: f32,
521 |     pub connector_color: Color,
522 | }
523 | 
524 | impl Default for Appearance {
525 |     fn default() -> Self {
526 |         Self {
527 |             background: None,
528 |             border_radius: 0.0,
529 |             border_width: 0.0,
530 |             border_color: Color::TRANSPARENT,
531 |             connector_width: 1.0,
532 |             connector_color: Color::BLACK,
533 |         }
534 |     }
535 | }
536 | 
537 | pub trait StyleSheet {
538 |     type Style: Default + Copy;
539 | 
540 |     fn appearance(&self, style: Self::Style) -> Appearance;
541 | }
542 | 


--------------------------------------------------------------------------------
/src/widget/graph/node.rs:
--------------------------------------------------------------------------------
  1 | use iced_core::{Background, Color, Point, Rectangle, Vector};
  2 | use iced_native::widget::{tree, Tree};
  3 | use iced_native::{event, layout, mouse, renderer, Element, Layout, Shell};
  4 | 
  5 | use super::editor::Event;
  6 | 
  7 | #[derive(Debug)]
  8 | pub enum State {
  9 |     Idle,
 10 |     Hovered,
 11 |     Translating { started_at: Point, offset: Vector },
 12 | }
 13 | 
 14 | impl State {
 15 |     pub(super) fn adjusted_bounds(&self, bounds: Rectangle) -> Rectangle {
 16 |         match self {
 17 |             State::Idle | State::Hovered => bounds,
 18 |             State::Translating { offset, .. } => bounds + *offset,
 19 |         }
 20 |     }
 21 | }
 22 | 
 23 | impl Default for State {
 24 |     fn default() -> Self {
 25 |         Self::Idle
 26 |     }
 27 | }
 28 | 
 29 | pub struct Node<'a, Message, Renderer>
 30 | where
 31 |     Renderer: iced_native::Renderer,
 32 |     Renderer::Theme: StyleSheet,
 33 | {
 34 |     content: Element<'a, Message, Renderer>,
 35 |     offset: Vector,
 36 |     pub(super) edges: Vec<usize>,
 37 |     style: <Renderer::Theme as StyleSheet>::Style,
 38 | }
 39 | 
 40 | impl<'a, Message, Renderer> Node<'a, Message, Renderer>
 41 | where
 42 |     Renderer: iced_native::Renderer,
 43 |     Renderer::Theme: StyleSheet,
 44 | {
 45 |     pub fn new(
 46 |         content: impl Into<Element<'a, Message, Renderer>>,
 47 |         offset: Vector,
 48 |         edges: Vec<usize>,
 49 |     ) -> Self {
 50 |         Self {
 51 |             content: content.into(),
 52 |             offset,
 53 |             edges,
 54 |             style: Default::default(),
 55 |         }
 56 |     }
 57 | 
 58 |     pub fn style(mut self, style: impl Into<<Renderer::Theme as StyleSheet>::Style>) -> Self {
 59 |         self.style = style.into();
 60 |         self
 61 |     }
 62 | }
 63 | 
 64 | impl<'a, Message, Renderer> Node<'a, Message, Renderer>
 65 | where
 66 |     Renderer: iced_native::Renderer,
 67 |     Renderer::Theme: StyleSheet,
 68 | {
 69 |     pub(super) fn tag(&self) -> tree::Tag {
 70 |         tree::Tag::of::<State>()
 71 |     }
 72 | 
 73 |     pub(super) fn children(&self) -> Vec<Tree> {
 74 |         vec![Tree::new(&self.content)]
 75 |     }
 76 | 
 77 |     pub(super) fn diff(&self, tree: &mut Tree) {
 78 |         tree.diff_children(std::slice::from_ref(&self.content));
 79 |     }
 80 | 
 81 |     pub(super) fn state(&self) -> tree::State {
 82 |         tree::State::new(State::default())
 83 |     }
 84 | 
 85 |     pub(super) fn layout(&self, renderer: &Renderer, limits: &layout::Limits) -> layout::Node {
 86 |         let padding = [20, 5, 5, 5].into();
 87 | 
 88 |         let content = self
 89 |             .content
 90 |             .as_widget()
 91 |             .layout(renderer, &limits.pad(padding));
 92 | 
 93 |         let node = content.size().pad(padding);
 94 | 
 95 |         let offset = Vector::new(padding.left as f32, padding.top as f32);
 96 | 
 97 |         layout::Node::with_children(node, vec![content.translate(offset)]).translate(self.offset)
 98 |     }
 99 | 
100 |     pub(super) fn on_event(
101 |         &mut self,
102 |         tree: &mut Tree,
103 |         event: iced_native::Event,
104 |         layout: Layout<'_>,
105 |         cursor_position: Point,
106 |         renderer: &Renderer,
107 |         clipboard: &mut dyn iced_native::Clipboard,
108 |         shell: &mut Shell<'_, Message>,
109 |         index: usize,
110 |         on_event: &dyn Fn(Event) -> Message,
111 |     ) -> event::Status {
112 |         let bounds = layout.bounds();
113 |         let content_bounds = layout.children().next().unwrap().bounds();
114 |         let in_bounds =
115 |             bounds.contains(cursor_position) && !content_bounds.contains(cursor_position);
116 | 
117 |         let state = tree.state.downcast_mut::<State>();
118 | 
119 |         if let State::Translating { started_at, offset } = state {
120 |             if let iced_native::Event::Mouse(event) = event {
121 |                 match event {
122 |                     mouse::Event::CursorMoved { .. } => {
123 |                         *offset = cursor_position - *started_at;
124 |                         return event::Status::Captured;
125 |                     }
126 |                     mouse::Event::ButtonReleased(mouse::Button::Left) => {
127 |                         shell.publish((on_event)(Event::NodeMoved {
128 |                             index,
129 |                             offset: self.offset + *offset,
130 |                         }));
131 |                         *state = in_bounds.then_some(State::Hovered).unwrap_or(State::Idle);
132 |                     }
133 |                     _ => {}
134 |                 }
135 |             }
136 | 
137 |             event::Status::Ignored
138 |         } else {
139 |             let status = self.content.as_widget_mut().on_event(
140 |                 tree.children.first_mut().unwrap(),
141 |                 event.clone(),
142 |                 layout.children().next().unwrap(),
143 |                 cursor_position,
144 |                 renderer,
145 |                 clipboard,
146 |                 shell,
147 |             );
148 | 
149 |             if matches!(status, event::Status::Ignored) {
150 |                 if let iced_native::Event::Mouse(event) = event {
151 |                     match event {
152 |                         mouse::Event::CursorMoved { .. }
153 |                             if in_bounds && matches!(*state, State::Idle) =>
154 |                         {
155 |                             *state = State::Hovered;
156 |                             return event::Status::Captured;
157 |                         }
158 |                         mouse::Event::CursorMoved { .. }
159 |                             if !in_bounds && matches!(*state, State::Hovered) =>
160 |                         {
161 |                             *state = State::Idle;
162 |                             return event::Status::Captured;
163 |                         }
164 |                         mouse::Event::ButtonPressed(mouse::Button::Left)
165 |                             if matches!(*state, State::Hovered) =>
166 |                         {
167 |                             *state = State::Translating {
168 |                                 started_at: cursor_position,
169 |                                 offset: Vector::default(),
170 |                             };
171 |                             return event::Status::Captured;
172 |                         }
173 |                         _ => {}
174 |                     }
175 |                 }
176 | 
177 |                 event::Status::Ignored
178 |             } else {
179 |                 status
180 |             }
181 |         }
182 |     }
183 | 
184 |     pub(super) fn draw(
185 |         &self,
186 |         tree: &Tree,
187 |         renderer: &mut Renderer,
188 |         theme: &<Renderer as iced_native::Renderer>::Theme,
189 |         style: &renderer::Style,
190 |         layout: Layout<'_>,
191 |         cursor_position: Point,
192 |         viewport: &Rectangle,
193 |     ) {
194 |         let state = tree.state.downcast_ref::<State>();
195 | 
196 |         let appearance = theme.appearance(self.style);
197 | 
198 |         let draw = |renderer: &mut Renderer| {
199 |             renderer.fill_quad(
200 |                 renderer::Quad {
201 |                     bounds: layout.bounds(),
202 |                     border_radius: appearance.border_radius,
203 |                     border_width: appearance.border_width,
204 |                     border_color: appearance.border_color,
205 |                 },
206 |                 appearance
207 |                     .background
208 |                     .unwrap_or_else(|| Color::TRANSPARENT.into()),
209 |             );
210 |             self.content.as_widget().draw(
211 |                 tree.children.first().unwrap(),
212 |                 renderer,
213 |                 theme,
214 |                 &renderer::Style {
215 |                     text_color: appearance.text_color.unwrap_or(style.text_color),
216 |                 },
217 |                 layout.children().next().unwrap(),
218 |                 cursor_position,
219 |                 viewport,
220 |             )
221 |         };
222 | 
223 |         if let State::Translating { offset, .. } = state {
224 |             renderer.with_translation(*offset, |renderer| {
225 |                 draw(renderer);
226 |             });
227 |         } else {
228 |             draw(renderer);
229 |         }
230 |     }
231 | 
232 |     pub(super) fn mouse_interaction(
233 |         &self,
234 |         tree: &Tree,
235 |         _layout: Layout<'_>,
236 |         _cursor_position: Point,
237 |         _viewport: &Rectangle,
238 |         _renderer: &Renderer,
239 |     ) -> mouse::Interaction {
240 |         let state = tree.state.downcast_ref::<State>();
241 | 
242 |         match state {
243 |             State::Idle => mouse::Interaction::default(),
244 |             State::Hovered => mouse::Interaction::Grab,
245 |             State::Translating { .. } => mouse::Interaction::Grabbing,
246 |         }
247 |     }
248 | }
249 | 
250 | #[derive(Debug, Clone, Copy)]
251 | pub struct Appearance {
252 |     pub text_color: Option<Color>,
253 |     pub background: Option<Background>,
254 |     pub border_radius: f32,
255 |     pub border_width: f32,
256 |     pub border_color: Color,
257 | }
258 | 
259 | impl Default for Appearance {
260 |     fn default() -> Self {
261 |         Self {
262 |             text_color: None,
263 |             background: None,
264 |             border_radius: 0.0,
265 |             border_width: 0.0,
266 |             border_color: Color::TRANSPARENT,
267 |         }
268 |     }
269 | }
270 | 
271 | pub trait StyleSheet {
272 |     type Style: Default + Copy;
273 | 
274 |     fn appearance(&self, style: Self::Style) -> Appearance;
275 | }
276 | 


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