Syntax experiment for a macro for defining UIs with libui-rs

libui-macro.rs

//! An example control gallery: a port of the same `ui` example.

extern crate ui;

use ui::{BoxControl, Button, Checkbox, ColorButton, Combobox, DateTimePicker, Entry};
use ui::{FontButton, Group, InitOptions, Label, Menu, MenuItem, ProgressBar, RadioButtons};
use ui::{Separator, Slider, Spinbox, Tab, Window};

fn run() {
    menu![
        ("File" {} [
            ("Open" {onClick => open_clicked}),
            ("Save" {onClick => save_clicked}),
        ]),
        ("Edit" {} [
            ("Checkable Item" {checkable}),
            (---),
            ("Disabled Item" {disabled}),
            (preferences),
        ]), 
        ("Help" {}, [
            ("Help"),
            (about),
        ]),
    ];

    window!("ui Control Gallery" {
        w => 640, h => 480, menubar, margined,
        onClosing => |_| {
            ui::quit();
            false
        },
    } [
        (BoxControl {vertical, padded} [
            (Group "Basic Controls" {margined} [
                (Button "Button"),
                (Checkbox "Checkbox"),
                (Entry "Entry" {text => "Lorem ipsum"}),
                (label "label"),
                (---),
                (DatePicker),
                (TimePicker),
                (DateTimePicker),
                (FontButton),
                (ColorButton),
            ]),
        ]),
        (BoxControl {vertical, padded} [
            (Group "Numbers" {margined} [
                (BoxControl {padded} [
                    (Spinbox {min => 0, max => 100,
                        onChange => |spinbox| update(spinbox.value()),
                    }),
                ]),
                (BoxControl {padded} [
                    (Slider {min => 0, max => 100,
                        onChange => |slider| update(slider.value()),
                    }),
                ]),
                (ProgressBar),
            ]),
            (Group "Lists" {margined} [
                (BoxControl {padded} [
                    (Combobox {} [
                        "Combobox Item 1",
                        "Combobox Item 2",
                        "Combobox Item 3",
                    ]),
                    (Combobox {editable} [
                        "Editable Item 1",
                        "Editable Item 2",
                        "Editable Item 3",
                    ]),
                    (RadioButtons {} [
                        "Radio Button 1",
                        "Radio Button 2",
                        "Radio Button 3",
                    ]),
                ]),
            ]),
            (Tab {} [
                ("Page 1" {} [(BoxControl),]),
                ("Page 2" {} [(BoxControl),]),
                ("Page 3" {} [(BoxControl),]),
            ]),
        ]),
    ]);

    mainwin.show();
    ui::main();
}

pub fn main() {
    ui::init(InitOptions).unwrap();
    run();
    ui::uninit();
}

fn open_clicked(_: &MenuItem, mainwin: &Window) {
    match ui::open_file(mainwin) {
        Some(filename) => ui::msg_box(mainwin, "File selected", &*filename),
        None => ui::msg_box_error(mainwin, "No file selected", "Don't be alarmed!"),
    }
}

fn save_clicked(_: &MenuItem, mainwin: &Window) {
    match ui::open_file(mainwin) {
        Some(filename) => {
            ui::msg_box(mainwin, "File selected (don't worry, it's still there)", &*filename)
        }
        None => ui::msg_box_error(mainwin, "No file selected", "Don't be alarmed!"),
    }
}

fn update(_: i64) {
    // TODO(pcwalton)
}