egui/examples/text_input_test/src/main.rs

#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
#![allow(rustdoc::missing_crate_level_docs)]

use eframe::egui;

fn main() -> eframe::Result {
    env_logger::init();
    let options = eframe::NativeOptions {
        viewport: egui::ViewportBuilder::default().with_inner_size([800.0, 600.0]),
        ..Default::default()
    };
    eframe::run_native(
        "Text Input Test - IBus/Wayland",
        options,
        Box::new(|_cc| Ok(Box::<TestApp>::default())),
    )
}

struct TestApp {
    // Single-line text inputs
    single_line_1: String,
    single_line_2: String,

    // Multi-line text input
    multi_line: String,

    // Code editor content
    code: String,

    // Password field
    password: String,

    // Input event log
    event_log: Vec<String>,
}

impl Default for TestApp {
    fn default() -> Self {
        Self {
            single_line_1: String::new(),
            single_line_2: "Pre-filled text".to_owned(),
            multi_line: "Type multiple lines here.\nLine 2\nLine 3".to_owned(),
            code: r#"fn main() {
    println!("Hello, world!");
}
"#.to_owned(),
            password: String::new(),
            event_log: Vec::new(),
        }
    }
}

impl eframe::App for TestApp {
    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
        // Log input events
        ctx.input(|i| {
            for event in &i.events {
                match event {
                    egui::Event::Text(text) => {
                        self.event_log.push(format!(">>> TEXT: {:?}", text));
                    }
                    egui::Event::Key { key, pressed, modifiers, .. } => {
                        self.event_log.push(format!("KEY: {:?} pressed={} (mods: {:?})", key, pressed, modifiers));
                    }
                    egui::Event::Ime(ime) => {
                        // Filter out the spammy Disabled events
                        match ime {
                            egui::ImeEvent::Disabled => {} // Skip logging these
                            _ => self.event_log.push(format!("IME: {:?}", ime)),
                        }
                    }
                    egui::Event::Paste(text) => {
                        self.event_log.push(format!("PASTE: {:?}", text));
                    }
                    _ => {}
                }
            }
        });

        // Keep event log manageable
        if self.event_log.len() > 100 {
            self.event_log.drain(0..50);
        }

        egui::SidePanel::right("event_log").show(ctx, |ui| {
            ui.heading("Input Events");
            if ui.button("Clear").clicked() {
                self.event_log.clear();
            }
            ui.separator();
            egui::ScrollArea::vertical().show(ui, |ui| {
                for event in self.event_log.iter().rev() {
                    ui.label(event);
                }
            });
        });

        egui::CentralPanel::default().show(ctx, |ui| {
            ui.heading("Text Input Test - IBus/Wayland Bug");
            ui.label("Test various text input widgets. If IBus under Wayland is broken, typing won't work.");

            // Show environment info
            ui.add_space(5.0);
            ui.group(|ui| {
                ui.label("Environment Detection:");
                let session_type = std::env::var("XDG_SESSION_TYPE").unwrap_or_else(|_| "unknown".to_string());
                let wayland_display = std::env::var("WAYLAND_DISPLAY").is_ok();
                let gtk_im = std::env::var("GTK_IM_MODULE").unwrap_or_else(|_| "not set".to_string());
                let qt_im = std::env::var("QT_IM_MODULE").unwrap_or_else(|_| "not set".to_string());
                let xmodifiers = std::env::var("XMODIFIERS").unwrap_or_else(|_| "not set".to_string());
                let ime_override = std::env::var("EGUI_IME_DISABLED").unwrap_or_else(|_| "not set".to_string());

                ui.label(format!("  XDG_SESSION_TYPE: {session_type}"));
                ui.label(format!("  WAYLAND_DISPLAY set: {wayland_display}"));
                ui.label(format!("  GTK_IM_MODULE: {gtk_im}"));
                ui.label(format!("  QT_IM_MODULE: {qt_im}"));
                ui.label(format!("  XMODIFIERS: {xmodifiers}"));
                ui.label(format!("  EGUI_IME_DISABLED: {ime_override}"));

                let is_wayland = session_type == "wayland" || wayland_display;
                let is_ibus = gtk_im == "ibus" || qt_im == "ibus" || xmodifiers.contains("ibus");
                if is_wayland && is_ibus {
                    ui.colored_label(egui::Color32::GREEN,
                        "IBus on Wayland detected - IME workaround is active!");
                }
            });

            ui.separator();

            egui::ScrollArea::vertical().show(ui, |ui| {
                ui.group(|ui| {
                    ui.heading("Single-line Text Edits");

                    ui.horizontal(|ui| {
                        ui.label("Empty field:");
                        ui.text_edit_singleline(&mut self.single_line_1);
                    });

                    ui.horizontal(|ui| {
                        ui.label("Pre-filled:");
                        ui.text_edit_singleline(&mut self.single_line_2);
                    });
                });

                ui.add_space(10.0);

                ui.group(|ui| {
                    ui.heading("Password Field");
                    ui.horizontal(|ui| {
                        ui.label("Password:");
                        ui.add(egui::TextEdit::singleline(&mut self.password).password(true));
                    });
                });

                ui.add_space(10.0);

                ui.group(|ui| {
                    ui.heading("Multi-line Text Edit");
                    ui.add(
                        egui::TextEdit::multiline(&mut self.multi_line)
                            .desired_width(f32::INFINITY)
                            .desired_rows(6)
                    );
                });

                ui.add_space(10.0);

                ui.group(|ui| {
                    ui.heading("Code Editor (with syntax highlighting)");
                    let theme = egui_extras::syntax_highlighting::CodeTheme::from_memory(ui.ctx(), ui.style());
                    let mut layouter = |ui: &egui::Ui, string: &dyn egui::TextBuffer, wrap_width: f32| {
                        let mut layout_job = egui_extras::syntax_highlighting::highlight(
                            ui.ctx(),
                            ui.style(),
                            &theme,
                            string.as_str(),
                            "rs",
                        );
                        layout_job.wrap.max_width = wrap_width;
                        ui.fonts_mut(|f| f.layout_job(layout_job))
                    };
                    ui.add(
                        egui::TextEdit::multiline(&mut self.code)
                            .font(egui::TextStyle::Monospace)
                            .code_editor()
                            .desired_width(f32::INFINITY)
                            .desired_rows(10)
                            .layouter(&mut layouter)
                    );
                });

                ui.add_space(10.0);

                ui.group(|ui| {
                    ui.heading("Current Values");
                    ui.label(format!("Single line 1: {:?}", self.single_line_1));
                    ui.label(format!("Single line 2: {:?}", self.single_line_2));
                    ui.label(format!("Password length: {}", self.password.len()));
                    ui.label(format!("Multi-line lines: {}", self.multi_line.lines().count()));
                    ui.label(format!("Code lines: {}", self.code.lines().count()));
                });
            });
        });
    }
}