crude toggle touch impl

native/src/widget/toggler.rs

@@ -1,11 +1,13 @@
 //! Show toggle controls using togglers.
 use std::hash::Hash;
 
+use crate::touch::Finger;
 use crate::{
-    event, layout, mouse, row, text, Align, Clipboard, Element, Event, Hasher,
+    event, layout, mouse, row, text, touch, Align, Clipboard, Element, Event,
-    HorizontalAlignment, Layout, Length, Point, Rectangle, Row, Text,
+    Hasher, HorizontalAlignment, Layout, Length, Point, Rectangle, Row, Text,
     VerticalAlignment, Widget,
 };
+use std::collections::HashSet;
 
 /// A toggler widget
 ///
@@ -34,6 +36,8 @@ pub struct Toggler<Message, Renderer: self::Renderer + text::Renderer> {
     spacing: u16,
     font: Renderer::Font,
     style: Renderer::Style,
+
+    fingers_mid_press: HashSet<Finger>,
 }
 
 impl<Message, Renderer: self::Renderer + text::Renderer>
@@ -66,6 +70,8 @@ impl<Message, Renderer: self::Renderer + text::Renderer>
             spacing: 0,
             font: Renderer::Font::default(),
             style: Renderer::Style::default(),
+
+            fingers_mid_press: HashSet::with_capacity(2),
         }
     }
 
@@ -176,8 +182,44 @@ where
             }
             Event::Touch(x) => {
                 eprintln!("{:?}", x);
+
+                match x {
+                    touch::Event::FingerPressed { id, position } => {
+                        if layout.bounds().contains(position) {
+                            let _ = self.fingers_mid_press.insert(id);
+
+                            event::Status::Captured
+                        } else {
                             event::Status::Ignored
                         }
+                    }
+                    touch::Event::FingerMoved { id, position } => {
+                        if !layout.bounds().contains(position) {
+                            let _ = self.fingers_mid_press.remove(&id);
+
+                            event::Status::Captured
+                        } else {
+                            event::Status::Ignored
+                        }
+                    }
+                    touch::Event::FingerLifted { id, position } => {
+                        if self.fingers_mid_press.remove(&id)
+                            && layout.bounds().contains(position)
+                        {
+                            // this should be treated as a click
+                            messages.push((self.on_toggle)(!self.is_active));
+
+                            event::Status::Captured
+                        } else {
+                            event::Status::Ignored
+                        }
+                    }
+                    touch::Event::FingerLost { id, .. } => {
+                        let _ = self.fingers_mid_press.remove(&id);
+                        event::Status::Ignored
+                    }
+                }
+            }
             _ => event::Status::Ignored,
         }
     }