dummy example

Cargo.toml

@@ -8,8 +8,10 @@ edition = "2018"
 crate_type = "bin"
 
 [dependencies]
+clipboard = "^0.5.0"
 dirs = "^3.0.1"
-gio = "^0"
-gtk = "^0"
+glium = "^0.27.0"
+imgui = "^0.5.0"
+imgui-glium-renderer = "^0.5.0"
+imgui-winit-support = "^0.5.0"
 rodio = "^0.11.0"
-iui = "0.3"

src/main.rs

@@ -1,21 +1,16 @@
 #![windows_subsystem = "windows"]
 
-use gio::prelude::*;
-use gtk::prelude::*;
-use gtk::Orientation;
 use rodio::{Sink, Source};
 use std::env::args;
 use std::fs::File;
 use std::io::BufReader;
 use std::path::PathBuf;
 use std::process::Command;
+use imgui::*;
 
-use iui::prelude::*;
-use iui::controls::{Label, Spinbox, Slider, Entry, MultilineEntry, VerticalBox, HorizontalBox, HorizontalSeparator, Group, Spacer};
-use std::rc::Rc;
-use std::cell::RefCell;
-//
-// const SPACING: i32 = 16;
+mod support;
+
+const SPACING: i32 = 16;
 //
 // fn error_popup(message: &str) {
 //     let popup = gtk::Window::new(gtk::WindowType::Toplevel);
@@ -151,127 +146,22 @@ fn get_data_dir() -> PathBuf {
 //     window.show_all();
 // }
 
-/// This struct will hold the values that multiple callbacks will need to access.
-struct State {
-    slider_val: i64,
-    spinner_val: i64,
-    entry_val: String,
-    multi_val: String,
-}
-
 fn main() {
-    // Initialize the UI framework.
-    let ui = UI::init().unwrap();
+    let system = support::init(file!());
 
-    // Initialize the state of the application.
-    let state = Rc::new(RefCell::new(
-        State { slider_val: 0, spinner_val: 0, entry_val: "".into(), multi_val: "".into() }
-    ));
-
-    // Set up the inputs for the application.
-    // While it's not necessary to create a block for this, it makes the code a lot easier
-    // to read; the indentation presents a visual cue informing the reader that these
-    // statements are related.
-    let (input_group, mut slider, mut spinner, mut entry, mut multi) = {
-        // The group will hold all the inputs
-        let mut input_group = Group::new(&ui, "Inputs");
-
-        // The vertical box arranges the inputs within the groups
-        let mut input_vbox = VerticalBox::new(&ui);
-        input_vbox.set_padded(&ui, true);
-
-        // Numerical inputs
-        let slider = Slider::new(&ui, 1, 100);
-        let spinner = Spinbox::new(&ui, 1, 100);
-        let entry = Entry::new(&ui);
-        let multi = MultilineEntry::new(&ui);
-
-        // Add everything in hierarchy
-        // Note the reverse order here. Again, it's not necessary, but it improves
-        // readability.
-        input_vbox.append(&ui, slider.clone(), LayoutStrategy::Compact);
-        input_vbox.append(&ui, spinner.clone(), LayoutStrategy::Compact);
-        input_vbox.append(&ui, Spacer::new(&ui), LayoutStrategy::Compact);
-        input_vbox.append(&ui, HorizontalSeparator::new(&ui), LayoutStrategy::Compact);
-        input_vbox.append(&ui, Spacer::new(&ui), LayoutStrategy::Compact);
-        input_vbox.append(&ui, entry.clone(), LayoutStrategy::Compact);
-        input_vbox.append(&ui, multi.clone(), LayoutStrategy::Stretchy);
-        input_group.set_child(&ui, input_vbox);
-
-        (input_group, slider, spinner, entry, multi)
-    };
-
-    // Set up the outputs for the application. Organization is very similar to the
-    // previous setup.
-    let (output_group, add_label, sub_label, text_label, bigtext_label) = {
-        let mut output_group = Group::new(&ui, "Outputs");
-        let mut output_vbox = VerticalBox::new(&ui);
-        let add_label = Label::new(&ui, "");
-        let sub_label = Label::new(&ui, "");
-        let text_label = Label::new(&ui, "");
-        let bigtext_label = Label::new(&ui, "");
-        output_vbox.append(&ui, add_label.clone(), LayoutStrategy::Compact);
-        output_vbox.append(&ui, sub_label.clone(), LayoutStrategy::Compact);
-        output_vbox.append(&ui, text_label.clone(), LayoutStrategy::Compact);
-        output_vbox.append(&ui, bigtext_label.clone(), LayoutStrategy::Stretchy);
-        output_group.set_child(&ui, output_vbox);
-
-        (output_group, add_label, sub_label, text_label, bigtext_label)
-    };
-
-    // This horizontal box will arrange the two groups of controls.
-    let mut hbox = HorizontalBox::new(&ui);
-    hbox.append(&ui, input_group, LayoutStrategy::Stretchy);
-    hbox.append(&ui, output_group, LayoutStrategy::Stretchy);
-
-    // The window allows all constituent components to be displayed.
-    let mut window = Window::new(&ui, "Input Output Test", 300, 150, WindowType::NoMenubar);
-    window.set_child(&ui, hbox);
-    window.show(&ui);
-
-    // These on_changed functions allow updating the application state when a
-    // control changes its value.
-
-    slider.on_changed(&ui, {
-        let state = state.clone();
-        move |val| { state.borrow_mut().slider_val = val; }
+    system.main_loop(move |_, ui| {
+        Window::new(im_str!("Hello world"))
+            .size([300.0, 100.0], Condition::FirstUseEver)
+            .build(&ui, || {
+                ui.text(im_str!("Hello world!"));
+                ui.text(im_str!("こんにちは世界！"));
+                ui.text(im_str!("This...is...imgui-rs!"));
+                ui.separator();
+                let mouse_pos = ui.io().mouse_pos;
+                ui.text(format!(
+                    "Mouse Position: ({:.1},{:.1})",
+                    mouse_pos[0], mouse_pos[1]
+                ));
+            });
     });
-
-    spinner.on_changed(&ui, {
-        let state = state.clone();
-        move |val| { state.borrow_mut().spinner_val = val; }
-    });
-
-    entry.on_changed(&ui, {
-        let state = state.clone();
-        move |val| { state.borrow_mut().entry_val = val; }
-    });
-
-    multi.on_changed(&ui, {
-        let state = state.clone();
-        move |val| { state.borrow_mut().multi_val = val; }
-    });
-
-
-    // Rather than just invoking ui.run(), using EventLoop gives a lot more control
-    // over the user interface event loop.
-    // Here, the on_tick() callback is used to update the view against the state.
-    let mut event_loop = ui.event_loop();
-    event_loop.on_tick(&ui, {
-        let ui = ui.clone();
-        let mut add_label = add_label.clone();
-        let mut sub_label = sub_label.clone();
-        let mut text_label = text_label.clone();
-        let mut bigtext_label = bigtext_label.clone();
-        move || {
-            let state = state.borrow();
-
-            // Update all the labels
-            add_label.set_text(&ui, &format!("Added: {}", state.slider_val + state.spinner_val));
-            sub_label.set_text(&ui, &format!("Subtracted: {}", state.slider_val - state.spinner_val));
-            text_label.set_text(&ui, &format!("Text: {}", state.entry_val));
-            bigtext_label.set_text(&ui, &format!("Multiline Text: {}", state.multi_val));
-        }
-    });
-    event_loop.run(&ui);
 }

src/support/clipboard.rs

@@ -0,0 +1,19 @@
+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());
+    }
+}

src/support/mod.rs

@@ -0,0 +1,140 @@
+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, FontGlyphRanges, 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()
+            }),
+        },
+        FontSource::TtfData {
+            data: include_bytes!("helsinki.ttf"),
+            size_pixels: font_size,
+            config: Some(FontConfig {
+                rasterizer_multiply: 1.75,
+                glyph_ranges: FontGlyphRanges::japanese(),
+                ..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);
+            }
+        })
+    }
+}