nrelm 0.1.1

An idiomatic GUI library inspired by Elm and based on gtk3-rs
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
150
151
152
153
154
155
156
157
158
159
160

// Don't show GTK 4.10 deprecations.
// We can't replace them without raising the GTK requirement to 4.10.
#![allow(deprecated)]

use std::convert::identity;

use gtk::glib;
use gtk::prelude::{ButtonExt, ContainerExt, GtkWindowExt, LabelExt, WidgetExt};
use nrelm::MessageBroker;
use nrelm::{
    Component, ComponentController, ComponentParts, ComponentSender, Controller, RelmApp,
    SimpleComponent,
};

static DIALOG_BROKER: MessageBroker<DialogMsg> = MessageBroker::new();

struct Dialog {
    visible: bool,
}

#[derive(Debug)]
enum DialogMsg {
    Show,
    Hide,
}

#[nrelm::component]
impl SimpleComponent for Dialog {
    type Init = ();
    type Input = DialogMsg;
    type Output = ButtonMsg;

    view! {
        dialog = gtk::Dialog {
            #[watch]
            set_visible: model.visible,
            set_modal: true,

            gtk::Label {
                set_size_request: (200, 80),
                set_halign: gtk::Align::Center,
                set_valign: gtk::Align::Center,
                #[watch]
                set_label: if dialog.transient_for().is_some() {
                    "I'm transient!"
                } else {
                    "I'm not transient..."
                },
            },

            connect_delete_event[sender] => move |_, _| {
                sender.input(DialogMsg::Hide);
                glib::Propagation::Stop
            }
        }
    }

    fn init(
        _init: Self::Init,
        root: Self::Root,
        sender: ComponentSender<Self>,
    ) -> ComponentParts<Self> {
        let model = Dialog { visible: false };
        let widgets = view_output!();
        ComponentParts { model, widgets }
    }

    fn update(&mut self, msg: Self::Input, _sender: ComponentSender<Self>) {
        match msg {
            DialogMsg::Show => self.visible = true,
            DialogMsg::Hide => self.visible = false,
        }
    }
}

struct Button {
    #[allow(dead_code)]
    dialog: Controller<Dialog>,
}

#[derive(Debug)]
enum ButtonMsg {}

#[nrelm::component]
impl SimpleComponent for Button {
    type Init = ();
    type Input = ButtonMsg;
    type Output = AppMsg;

    view! {
        button = &gtk::Button {
            set_label: "Show the dialog",
            connect_clicked => move |_| {
                DIALOG_BROKER.send(DialogMsg::Show);
            }
        }
    }

    fn init(
        _init: Self::Init,
        root: Self::Root,
        sender: ComponentSender<Self>,
    ) -> ComponentParts<Self> {
        // We don't have access to the parent window from here
        // but we can just use the button to set the transient window for the dialog.
        // Relm4 will get the window later by calling [`WidgetExt::root()`]
        // on the button once all widgets are connected.
        let dialog = Dialog::builder()
            .transient_for(&root)
            .launch_with_broker((), &DIALOG_BROKER)
            .forward(sender.input_sender(), identity);

        let model = Button { dialog };
        let widgets = view_output!();
        ComponentParts { model, widgets }
    }

    fn update(&mut self, _msg: Self::Input, _sender: ComponentSender<Self>) {}
}

#[derive(Debug)]
enum AppMsg {}

struct App {
    button: Controller<Button>,
}

#[nrelm::component]
impl SimpleComponent for App {
    type Init = ();
    type Input = AppMsg;
    type Output = ();

    view! {
        main_window = gtk::Window {
            set_default_size: (500, 250),
            add: model.button.widget(),
        }
    }

    fn init(
        _init: Self::Init,
        root: Self::Root,
        sender: ComponentSender<Self>,
    ) -> ComponentParts<Self> {
        let button = Button::builder()
            .launch(())
            .forward(sender.input_sender(), identity);
        let model = App { button };
        let widgets = view_output!();
        ComponentParts { model, widgets }
    }

    fn update(&mut self, _msg: Self::Input, _sender: ComponentSender<Self>) {}
}

fn main() {
    let app = RelmApp::new("nrelm.example.transient_dialog");
    app.run::<App>(());
}