Reworked glium demo to use the shared example code

implot-examples/implot-glium-demo/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "implot-glium-demo"
+version = "0.0.0"
+edition = "2018"
+authors = ["Sandro Merkli", "implot-rs contributors"]
+description = "implot examples, with backend code for using glium (originally from imgui-examples)"
+homepage = "https://github.com/4bb4/implot-rs"
+repository = "https://github.com/4bb4/implot-rs"
+license = "MIT/Apache-2.0"
+publish = false
+
+[dependencies]
+clipboard = "0.5"
+glium = { version = "0.27", default-features = true }
+image = "0.23"
+imgui-sys = "0.5.0"
+imgui = "0.5.0"
+imgui-glium-renderer = "0.5.0"
+imgui-winit-support = "0.5.0"
+
+implot-sys = { path = "../../implot-sys" }
+implot = { path = "../../" }
+examples-shared = { path = "../examples-shared" }

implot-examples/implot-glium-demo/src/support/clipboard.rs

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+// Taken directly from imgui-rs examples at
+//
+//   https://github.com/Gekkio/imgui-rs/tree/master/imgui-examples/examples/support
+//
+// Not my code. Originally by Joonas Javanainen and the ImGUI-rs contributors
+use clipboard::{ClipboardContext, ClipboardProvider};
+use imgui::{ClipboardBackend, ImStr, ImString};
+
+pub struct ClipboardSupport(ClipboardContext);
+
+pub fn init() -> Option<ClipboardSupport> {
+    ClipboardContext::new()
+        .ok()
+        .map(|ctx| ClipboardSupport(ctx))
+}
+
+impl ClipboardBackend for ClipboardSupport {
+    fn get(&mut self) -> Option<ImString> {
+        self.0.get_contents().ok().map(|text| text.into())
+    }
+    fn set(&mut self, text: &ImStr) {
+        let _ = self.0.set_contents(text.to_str().to_owned());
+    }
+}

implot-examples/implot-glium-demo/src/support/mod.rs

@@ -0,0 +1,133 @@
+// Taken directly from imgui-rs examples at
+//
+//   https://github.com/Gekkio/imgui-rs/tree/master/imgui-examples/examples/support
+//
+// Not my code. Originally by Joonas Javanainen and the ImGUI-rs contributors
+use glium::glutin;
+use glium::glutin::event::{Event, WindowEvent};
+use glium::glutin::event_loop::{ControlFlow, EventLoop};
+use glium::glutin::window::WindowBuilder;
+use glium::{Display, Surface};
+use imgui::{Context, FontConfig, FontSource, Ui};
+use imgui_glium_renderer::Renderer;
+use imgui_winit_support::{HiDpiMode, WinitPlatform};
+use std::time::Instant;
+
+mod clipboard;
+
+pub struct System {
+    pub event_loop: EventLoop<()>,
+    pub display: glium::Display,
+    pub imgui: Context,
+    pub platform: WinitPlatform,
+    pub renderer: Renderer,
+    pub font_size: f32,
+}
+
+pub fn init(title: &str) -> System {
+    let title = match title.rfind('/') {
+        Some(idx) => title.split_at(idx + 1).1,
+        None => title,
+    };
+    let event_loop = EventLoop::new();
+    let context = glutin::ContextBuilder::new().with_vsync(true);
+    let builder = WindowBuilder::new()
+        .with_title(title.to_owned())
+        .with_inner_size(glutin::dpi::LogicalSize::new(1024f64, 768f64));
+    let display =
+        Display::new(builder, context, &event_loop).expect("Failed to initialize display");
+
+    let mut imgui = Context::create();
+    imgui.set_ini_filename(None);
+
+    if let Some(backend) = clipboard::init() {
+        imgui.set_clipboard_backend(Box::new(backend));
+    } else {
+        eprintln!("Failed to initialize clipboard");
+    }
+
+    let mut platform = WinitPlatform::init(&mut imgui);
+    {
+        let gl_window = display.gl_window();
+        let window = gl_window.window();
+        platform.attach_window(imgui.io_mut(), &window, HiDpiMode::Rounded);
+    }
+
+    let hidpi_factor = platform.hidpi_factor();
+    let font_size = (13.0 * hidpi_factor) as f32;
+    imgui.fonts().add_font(&[FontSource::DefaultFontData {
+        config: Some(FontConfig {
+            size_pixels: font_size,
+            ..FontConfig::default()
+        }),
+    }]);
+
+    imgui.io_mut().font_global_scale = (1.0 / hidpi_factor) as f32;
+
+    let renderer = Renderer::init(&mut imgui, &display).expect("Failed to initialize renderer");
+
+    System {
+        event_loop,
+        display,
+        imgui,
+        platform,
+        renderer,
+        font_size,
+    }
+}
+
+impl System {
+    pub fn main_loop<F: FnMut(&mut bool, &mut Ui) + 'static>(self, mut run_ui: F) {
+        let System {
+            event_loop,
+            display,
+            mut imgui,
+            mut platform,
+            mut renderer,
+            ..
+        } = self;
+        let mut last_frame = Instant::now();
+
+        event_loop.run(move |event, _, control_flow| match event {
+            Event::NewEvents(_) => {
+                let now = Instant::now();
+                imgui.io_mut().update_delta_time(now - last_frame);
+                last_frame = now;
+            }
+            Event::MainEventsCleared => {
+                let gl_window = display.gl_window();
+                platform
+                    .prepare_frame(imgui.io_mut(), &gl_window.window())
+                    .expect("Failed to prepare frame");
+                gl_window.window().request_redraw();
+            }
+            Event::RedrawRequested(_) => {
+                let mut ui = imgui.frame();
+
+                let mut run = true;
+                run_ui(&mut run, &mut ui);
+                if !run {
+                    *control_flow = ControlFlow::Exit;
+                }
+
+                let gl_window = display.gl_window();
+                let mut target = display.draw();
+                target.clear_color_srgb(1.0, 1.0, 1.0, 1.0);
+                platform.prepare_render(&ui, gl_window.window());
+                let draw_data = ui.render();
+                renderer
+                    .render(&mut target, draw_data)
+                    .expect("Rendering failed");
+                target.finish().expect("Failed to swap buffers");
+            }
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => *control_flow = ControlFlow::Exit,
+            event => {
+                let gl_window = display.gl_window();
+                platform.handle_event(imgui.io_mut(), gl_window.window(), &event);
+            }
+        })
+    }
+}