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

use crate::widgets::{Widget, WidgetConfig};
use std::{
    cell::RefCell,
    rc::Rc,
    sync::mpsc::{Receiver, Sender},
};
/// This is the struct that gets returned when a widget is added to the context.
pub struct Response<R> {
    ///This is used to comunicate with the widget
    pub channel: R,
    pub(crate) _id: WidgetId,
    pub(crate) _layer_id: LayerId,
}

pub(crate) type LayerNummerId = u64;
pub(crate) type WidgetNummerId = u64;
pub(crate) type LayerChannelSender = Sender<(LayerNummerId, LayerInstructions)>;
pub(crate) type LayerChannelReceiver = Receiver<(LayerNummerId, LayerInstructions)>;

pub(crate) type WidgetChannelSender = Sender<((LayerNummerId, WidgetNummerId), WidgetInstruction)>;
pub(crate) type WidgetChannelReceiver =
    Receiver<((LayerNummerId, WidgetNummerId), WidgetInstruction)>;
pub(crate) enum LayerInstructions {
    Drop,
    AddWidget(Box<dyn Widget + 'static>, WidgetNummerId),
}

pub(crate) enum WidgetInstruction {
    Drop,
}

///The same as LayerId, but you can't clone this one
///Used for widgets that want to take control of a layer
///For example Widgets::Concealer
pub struct SingularLayerId(pub(crate) LayerId);

impl SingularLayerId {
    pub fn into_layer_id(self) -> LayerId {
        self.0
    }
    pub fn add_widget<ReturnChannel, W: Widget + 'static>(
        &mut self,
        widget_config: impl WidgetConfig<ReturnChannel, W>,
    ) -> Response<ReturnChannel> {
        self.0.add_widget(widget_config)
    }
    pub fn get_active(&self) -> bool {
        self.0.get_active()
    }

    pub(crate) fn set_is_active(&mut self, is_active: bool) {
        self.0.set_is_active(is_active)
    }
}

///Used to create widgets at a layer.
///Once this and every widget on this layer are dropped, so is the internal layer.
#[derive(Clone)]
pub struct LayerId {
    layer: Rc<InternalLayerId>,
    pub(crate) is_active: Rc<RefCell<bool>>,
    widget_id: Rc<RefCell<WidgetNummerId>>,
    widget_channel: WidgetChannelSender,
}

impl LayerId {
    pub(crate) fn new(
        id: LayerNummerId,
        channel: LayerChannelSender,
        is_active: Rc<RefCell<bool>>,
        widget_id: Rc<RefCell<WidgetNummerId>>,
        widget_channel: WidgetChannelSender,
    ) -> Self {
        let layer = Rc::new(InternalLayerId::new(id, channel));
        Self {
            layer,
            is_active,
            widget_id,
            widget_channel,
        }
    }

    ///Adds a widget configuration to the layer that this id represents.
    ///Returns a channel to comunicate with the widget.
    pub fn add_widget<ReturnChannel, W: Widget + 'static>(
        &mut self,
        widget_config: impl WidgetConfig<ReturnChannel, W>,
    ) -> Response<ReturnChannel> {
        let (widget, res) = widget_config.to_widget();
        let mut widget_id = self.widget_id.borrow_mut();
        *widget_id += 1;
        let x = Response {
            _layer_id: self.clone(),
            channel: res,
            _id: WidgetId::new(self.id(), *widget_id, self.widget_channel.clone()),
        };
        self.layer.as_ref().add_widget(widget, *widget_id);
        x
    }

    pub(crate) fn id(&self) -> LayerNummerId {
        self.layer.as_ref().id
    }

    ///Set a layer to active or inactive.
    ///Layers that are inactive won't be rendered or receive updates.
    pub fn set_is_active(&self, is_active: bool) {
        self.is_active.replace(is_active);
    }

    ///Get if the layer is active or not.
    pub fn get_active(&self) -> bool {
        *self.is_active.borrow()
    }
}
pub(crate) struct InternalLayerId {
    pub(crate) id: LayerNummerId,
    channel: LayerChannelSender,
}

impl InternalLayerId {
    pub(crate) fn new(id: LayerNummerId, channel: LayerChannelSender) -> Self {
        Self { id, channel }
    }
    pub(crate) fn add_widget(&self, widget: impl Widget + 'static, id: WidgetNummerId) {
        let _ = self
            .channel
            .send((self.id, LayerInstructions::AddWidget(Box::new(widget), id)));
    }
}
impl Drop for InternalLayerId {
    fn drop(&mut self) {
        let _ = self.channel.send((self.id, LayerInstructions::Drop));
    }
}
pub(crate) struct WidgetId {
    pub(crate) id: WidgetNummerId,
    pub(crate) layer: LayerNummerId,
    channel: WidgetChannelSender,
}
impl Drop for WidgetId {
    fn drop(&mut self) {
        let _ = self
            .channel
            .send(((self.layer, self.id), WidgetInstruction::Drop));
    }
}
impl WidgetId {
    pub(crate) fn new(
        layer: LayerNummerId,
        id: WidgetNummerId,
        channel: WidgetChannelSender,
    ) -> Self {
        Self { layer, id, channel }
    }
}