native-windows-gui 1.0.13

A rust library to develop native GUI applications on the desktop for Microsoft Windows. Native-windows-gui wraps the native win32 window controls in a rustic API
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149

/*!

    A very simple application that show how to use a flexbox layout.

    Requires the following features: `cargo run --example flexbox --features "flexbox"`
*/

extern crate native_windows_gui as nwg;
use nwg::NativeUi;


#[derive(Default)]
pub struct FlexBoxApp {
    window: nwg::Window,
    layout: nwg::FlexboxLayout,
    button1: nwg::Button,
    button2: nwg::Button,
    button3: nwg::Button
}

impl FlexBoxApp {

    fn exit(&self) {
        nwg::stop_thread_dispatch();
    }

}

//
// ALL of this stuff is handled by native-windows-derive
//
mod flexbox_app_ui {
    use native_windows_gui as nwg;
    use super::*;
    use std::rc::Rc;
    use std::cell::RefCell;
    use std::ops::Deref;

    pub struct FlexBoxAppUi {
        inner: Rc<FlexBoxApp>,
        default_handler: RefCell<Option<nwg::EventHandler>>
    }

    impl nwg::NativeUi<FlexBoxAppUi> for FlexBoxApp {
        fn build_ui(mut data: FlexBoxApp) -> Result<FlexBoxAppUi, nwg::NwgError> {
            use nwg::Event as E;
            
            // Controls
            nwg::Window::builder()
                .size((500, 300))
                .position((300, 300))
                .title("Flexbox example")
                .build(&mut data.window)?;

            nwg::Button::builder()
                .text("Btn 1")
                .parent(&data.window)
                .focus(true)
                .build(&mut data.button1)?;

            nwg::Button::builder()
                .text("Btn 2")
                .parent(&data.window)
                .build(&mut data.button2)?;

            nwg::Button::builder()
                .text("Btn 3")
                .parent(&data.window)
                .build(&mut data.button3)?;

            // Wrap-up
            let ui =FlexBoxAppUi {
                inner:  Rc::new(data),
                default_handler: Default::default(),
            };

            // Events
            let evt_ui = Rc::downgrade(&ui.inner);
            let handle_events = move |evt, _evt_data, handle| {
                if let Some(evt_ui) = evt_ui.upgrade() {
                    match evt {
                        E::OnWindowClose => 
                            if &handle == &evt_ui.window {
                                FlexBoxApp::exit(&evt_ui);
                            },
                        _ => {}
                    }
                }
            };

           *ui.default_handler.borrow_mut() = Some(nwg::full_bind_event_handler(&ui.window.handle, handle_events));


            // Layout
            use nwg::stretch::{geometry::{Size, Rect}, style::{Dimension as D, FlexDirection, AlignSelf}};
            const FIFTY_PC: D = D::Percent(0.5);
            const PT_10: D = D::Points(10.0);
            const PT_5: D = D::Points(5.0);
            const PADDING: Rect<D> = Rect{ start: PT_10, end: PT_10, top: PT_10, bottom: PT_10 };
            const MARGIN: Rect<D> = Rect{ start: PT_5, end: PT_5, top: PT_5, bottom: PT_5 };

            nwg::FlexboxLayout::builder()
                .parent(&ui.window)
                .flex_direction(FlexDirection::Row)
                .padding(PADDING)
                .child(&ui.button1)
                    .child_margin(MARGIN)
                    .child_max_size(Size { width: D::Points(200.0), height: D::Undefined })
                    .child_size(Size { width: FIFTY_PC, height: D::Auto })
                .child(&ui.button2)
                    .child_margin(MARGIN)
                    .child_align_self(AlignSelf::FlexEnd)
                    .child_size(Size { width: D::Percent(0.25), height: FIFTY_PC })
                .child(&ui.button3)
                    .child_margin(MARGIN)
                    .child_flex_grow(2.0)
                    .child_size(Size { width: D::Auto, height: D::Auto })
                .build(&ui.layout)?;

            return Ok(ui);
        }
    }

    impl Drop for FlexBoxAppUi {
        /// To make sure that everything is freed without issues, the default handler must be unbound.
        fn drop(&mut self) {
            let handler = self.default_handler.borrow();
            if handler.is_some() {
                nwg::unbind_event_handler(handler.as_ref().unwrap());
            }
        }
    }

    impl Deref for FlexBoxAppUi {
        type Target = FlexBoxApp;

        fn deref(&self) -> &FlexBoxApp {
            &self.inner
        }
    }
}

fn main() {
    nwg::init().expect("Failed to init Native Windows GUI");
    nwg::Font::set_global_family("Segoe UI").expect("Failed to set default font");

    let _ui = FlexBoxApp::build_ui(Default::default()).expect("Failed to build UI");
    
    nwg::dispatch_thread_events();
}