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

use druid::{kurbo::BezPath, piet::PaintBrush, widget::LabelText, *};

use super::label;
use crate::theme::color::{base, list, typography::BODY};

/// 一个可以点击折叠展开的文件夹列表组件
pub struct FolderList<T> {
    opened: bool,
    hot: bool,
    inner: WidgetPod<T, Box<dyn Widget<T>>>,
    text: WidgetPod<T, Box<dyn Widget<T>>>,
}

impl<T: Data> FolderList<T> {
    /// 一个可以点击折叠展开的文件夹列表组件，提供需要折叠展开的组件和说明文本信息
    pub fn new<W: Widget<T> + 'static>(inner: W, text: impl Into<LabelText<T>>) -> FolderList<T> {
        FolderList {
            opened: false,
            hot: false,
            text: WidgetPod::new(
                label::new(text.into())
                    .with_text_size(14.)
                    .with_text_color(base::MEDIUM)
                    .with_font(BODY)
                    .padding((40., 0., 0., 0.))
                    .align_vertical(druid::UnitPoint::LEFT)
                    .boxed(),
            ),
            inner: WidgetPod::new(inner.boxed()),
        }
    }
}

impl<T: Data> Widget<T> for FolderList<T> {
    fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut T, env: &Env) {
        let should_spread = match event {
            Event::MouseDown(m) => {
                if m.pos.y < 40. {
                    ctx.set_active(true);
                    ctx.request_paint();
                    false
                } else {
                    true
                }
            }
            Event::MouseUp(m) => {
                if ctx.is_active() {
                    ctx.set_active(false);
                    ctx.request_paint();
                    if m.pos.y < 40. {
                        self.opened = !self.opened;
                        ctx.request_layout();
                        false
                    } else {
                        true
                    }
                } else {
                    true
                }
            }
            Event::MouseMove(m) => {
                if self.hot != (m.pos.y < 40.) {
                    self.hot = m.pos.y < 40.;
                    ctx.request_paint();
                    true
                } else {
                    true
                }
            }
            _ => true,
        };
        self.text.event(ctx, event, data, env);
        if should_spread && (event.should_propagate_to_hidden() || self.opened) {
            self.inner.event(ctx, event, data, env);
        }
    }

    fn lifecycle(&mut self, ctx: &mut LifeCycleCtx, event: &LifeCycle, data: &T, env: &Env) {
        if let LifeCycle::HotChanged(_) = event {
            ctx.request_paint();
        }
        self.text.lifecycle(ctx, event, data, env);
        if event.should_propagate_to_hidden() || self.opened {
            self.inner.lifecycle(ctx, event, data, env);
        }
    }

    fn update(&mut self, ctx: &mut UpdateCtx, _old_data: &T, data: &T, env: &Env) {
        self.text.update(ctx, data, env);
        self.inner.update(ctx, data, env);
    }

    fn layout(&mut self, ctx: &mut LayoutCtx, bc: &BoxConstraints, data: &T, env: &Env) -> Size {
        bc.debug_check("FolderList");
        let text_bc =
            BoxConstraints::new((bc.min().width, 40.).into(), (bc.max().width, 40.).into());
        self.text.layout(ctx, &text_bc, data, env);
        self.text.set_origin(ctx, Point::ZERO);
        if self.opened {
            let list_bc = bc.shrink((40., 40.));
            let size = self.inner.layout(ctx, &list_bc, data, env);
            self.inner.set_origin(ctx, (40., 40.).into());
            bc.constrain(size + (40., 40.).into())
        } else {
            bc.constrain((0., 40.))
        }
    }

    fn paint(&mut self, ctx: &mut PaintCtx, data: &T, env: &Env) {
        let size = ctx.size();
        let is_hot = self.hot && ctx.is_hot();
        let is_active = ctx.is_active();
        let text_size = Size::new(size.width, 40.);

        if is_hot {
            ctx.fill(
                text_size.to_rect(),
                &PaintBrush::Color(if is_active {
                    env.get(base::LOW)
                } else {
                    env.get(list::LIST_LOW)
                }),
            )
        }

        self.text.paint(ctx, data, env);
        let mut switch_icon = BezPath::new();
        if self.opened {
            switch_icon.move_to((14.5, 22.8));
            switch_icon.line_to((20., 17.3));
            switch_icon.line_to((25.5, 22.8));
            ctx.stroke(&switch_icon, &PaintBrush::Color(env.get(base::MEDIUM)), 1.);
            self.inner.paint(ctx, data, env);
        } else {
            switch_icon.move_to((14.5, 17.3));
            switch_icon.line_to((20., 22.8));
            switch_icon.line_to((25.5, 17.3));
            ctx.stroke(&switch_icon, &PaintBrush::Color(env.get(base::MEDIUM)), 1.);
        }
    }
}