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

use crate::{
    epaint, text_selection, CursorIcon, Label, Response, Sense, Stroke, Ui, Widget, WidgetInfo,
    WidgetText, WidgetType,
};

use self::text_selection::LabelSelectionState;

/// Clickable text, that looks like a hyperlink.
///
/// To link to a web page, use [`Hyperlink`], [`Ui::hyperlink`] or [`Ui::hyperlink_to`].
///
/// See also [`Ui::link`].
///
/// ```
/// # egui::__run_test_ui(|ui| {
/// // These are equivalent:
/// if ui.link("Documentation").clicked() {
///     // …
/// }
///
/// if ui.add(egui::Link::new("Documentation")).clicked() {
///     // …
/// }
/// # });
/// ```
#[must_use = "You should put this widget in a ui with `ui.add(widget);`"]
pub struct Link {
    text: WidgetText,
}

impl Link {
    pub fn new(text: impl Into<WidgetText>) -> Self {
        Self { text: text.into() }
    }
}

impl Widget for Link {
    fn ui(self, ui: &mut Ui) -> Response {
        let Self { text } = self;
        let label = Label::new(text).sense(Sense::click());

        let (galley_pos, galley, response) = label.layout_in_ui(ui);
        response
            .widget_info(|| WidgetInfo::labeled(WidgetType::Link, ui.is_enabled(), galley.text()));

        if ui.is_rect_visible(response.rect) {
            let color = ui.visuals().hyperlink_color;
            let visuals = ui.style().interact(&response);

            let underline = if response.hovered() || response.has_focus() {
                Stroke::new(visuals.fg_stroke.width, color)
            } else {
                Stroke::NONE
            };

            let selectable = ui.style().interaction.selectable_labels;
            if selectable {
                LabelSelectionState::label_text_selection(
                    ui, &response, galley_pos, galley, color, underline,
                );
            } else {
                ui.painter().add(
                    epaint::TextShape::new(galley_pos, galley, color).with_underline(underline),
                );
            }

            if response.hovered() {
                ui.ctx().set_cursor_icon(CursorIcon::PointingHand);
            }
        }

        response
    }
}

/// A clickable hyperlink, e.g. to `"https://github.com/emilk/egui"`.
///
/// See also [`Ui::hyperlink`] and [`Ui::hyperlink_to`].
///
/// ```
/// # egui::__run_test_ui(|ui| {
/// // These are equivalent:
/// ui.hyperlink("https://github.com/emilk/egui");
/// ui.add(egui::Hyperlink::new("https://github.com/emilk/egui"));
///
/// // These are equivalent:
/// ui.hyperlink_to("My favorite repo", "https://github.com/emilk/egui");
/// ui.add(egui::Hyperlink::from_label_and_url("My favorite repo", "https://github.com/emilk/egui"));
/// # });
/// ```
#[must_use = "You should put this widget in a ui with `ui.add(widget);`"]
pub struct Hyperlink {
    url: String,
    text: WidgetText,
    new_tab: bool,
}

impl Hyperlink {
    #[allow(clippy::needless_pass_by_value)]
    pub fn new(url: impl ToString) -> Self {
        let url = url.to_string();
        Self {
            url: url.clone(),
            text: url.into(),
            new_tab: false,
        }
    }

    #[allow(clippy::needless_pass_by_value)]
    pub fn from_label_and_url(text: impl Into<WidgetText>, url: impl ToString) -> Self {
        Self {
            url: url.to_string(),
            text: text.into(),
            new_tab: false,
        }
    }

    /// Always open this hyperlink in a new browser tab.
    #[inline]
    pub fn open_in_new_tab(mut self, new_tab: bool) -> Self {
        self.new_tab = new_tab;
        self
    }
}

impl Widget for Hyperlink {
    fn ui(self, ui: &mut Ui) -> Response {
        let Self { url, text, new_tab } = self;

        let response = ui.add(Link::new(text));

        if response.clicked() {
            let modifiers = ui.ctx().input(|i| i.modifiers);
            ui.ctx().open_url(crate::OpenUrl {
                url: url.clone(),
                new_tab: new_tab || modifiers.any(),
            });
        }
        if response.middle_clicked() {
            ui.ctx().open_url(crate::OpenUrl {
                url: url.clone(),
                new_tab: true,
            });
        }

        if ui.style().url_in_tooltip {
            response.on_hover_text(url)
        } else {
            response
        }
    }
}