Merge branch 'ios-support-wip' into feature/touch-support

11 files changed, 188 insertions, 43 deletions

diff --git a/core/src/mouse/event.rs b/core/src/mouse/event.rs
index 2f07b207..321b8399 100644
--- a/core/src/mouse/event.rs
+++ b/core/src/mouse/event.rs
@@ -1,3 +1,5 @@
+use crate::Point;
+
 use super::Button;
 
 /// A mouse event.
@@ -16,11 +18,8 @@ pub enum Event {
 
     /// The mouse cursor was moved
     CursorMoved {
-        /// The X coordinate of the mouse position
-        x: f32,
-
-        /// The Y coordinate of the mouse position
-        y: f32,
+        /// The new position of the mouse cursor
+        position: Point,
     },
 
     /// A mouse button was pressed.
diff --git a/native/src/event.rs b/native/src/event.rs
index 0e86171e..f3c260c0 100644
--- a/native/src/event.rs
+++ b/native/src/event.rs
@@ -1,5 +1,8 @@
 //! Handle events of a user interface.
-use crate::{keyboard, mouse, window};
+use crate::keyboard;
+use crate::mouse;
+use crate::touch;
+use crate::window;
 
 /// A user interface event.
 ///
@@ -17,6 +20,9 @@ pub enum Event {
 
     /// A window event
     Window(window::Event),
+
+    /// A touch event
+    Touch(touch::Touch),
 }
 
 /// The status of an [`Event`] after being processed.
diff --git a/native/src/lib.rs b/native/src/lib.rs
index f9a99c48..0890785b 100644
--- a/native/src/lib.rs
+++ b/native/src/lib.rs
@@ -41,6 +41,7 @@ pub mod overlay;
 pub mod program;
 pub mod renderer;
 pub mod subscription;
+pub mod touch;
 pub mod widget;
 pub mod window;
 
diff --git a/native/src/touch.rs b/native/src/touch.rs
new file mode 100644
index 00000000..88bd83bb
--- /dev/null
+++ b/native/src/touch.rs
@@ -0,0 +1,35 @@
+//! Build touch events.
+use crate::Point;
+
+/// A touch interaction.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Touch {
+    /// The finger of the touch.
+    pub finger: Finger,
+
+    /// The position of the touch.
+    pub position: Point,
+
+    /// The state of the touch.
+    pub phase: Phase,
+}
+
+/// A unique identifier representing a finger on a touch interaction.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct Finger(pub u64);
+
+/// The state of a touch interaction.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Phase {
+    /// A touch interaction was started.
+    Started,
+
+    /// An on-going touch interaction was moved.
+    Moved,
+
+    /// A touch interaction was ended.
+    Ended,
+
+    /// A touch interaction was canceled.
+    Canceled,
+}
diff --git a/native/src/widget/button.rs b/native/src/widget/button.rs
index dca20e13..7d5eb30c 100644
--- a/native/src/widget/button.rs
+++ b/native/src/widget/button.rs
@@ -4,6 +4,7 @@
 use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
+use crate::touch::{self, Touch};
 use crate::{
     Clipboard, Element, Hasher, Layout, Length, Point, Rectangle, Widget,
 };
@@ -164,7 +165,11 @@ where
         _clipboard: Option<&dyn Clipboard>,
     ) -> event::Status {
         match event {
-            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
+            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
+            | Event::Touch(Touch {
+                phase: touch::Phase::Started,
+                ..
+            }) => {
                 if self.on_press.is_some() {
                     let bounds = layout.bounds();
 
@@ -175,7 +180,11 @@ where
                     }
                 }
             }
-            Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left)) => {
+            Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
+            | Event::Touch(Touch {
+                phase: touch::Phase::Ended,
+                ..
+            }) => {
                 if let Some(on_press) = self.on_press.clone() {
                     let bounds = layout.bounds();
 
@@ -190,6 +199,12 @@ where
                     }
                 }
             }
+            Event::Touch(Touch {
+                phase: touch::Phase::Canceled,
+                ..
+            }) => {
+                self.state.is_pressed = false;
+            }
             _ => {}
         }
 
diff --git a/native/src/widget/checkbox.rs b/native/src/widget/checkbox.rs
index 81420458..92175b25 100644
--- a/native/src/widget/checkbox.rs
+++ b/native/src/widget/checkbox.rs
@@ -6,6 +6,7 @@ use crate::layout;
 use crate::mouse;
 use crate::row;
 use crate::text;
+use crate::touch::{self, Touch};
 use crate::{
     Align, Clipboard, Element, Hasher, HorizontalAlignment, Layout, Length,
     Point, Rectangle, Row, Text, VerticalAlignment, Widget,
@@ -154,7 +155,11 @@ where
         _clipboard: Option<&dyn Clipboard>,
     ) -> event::Status {
         match event {
-            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
+            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
+            | Event::Touch(Touch {
+                phase: touch::Phase::Started,
+                ..
+            }) => {
                 let mouse_over = layout.bounds().contains(cursor_position);
 
                 if mouse_over {
diff --git a/native/src/widget/radio.rs b/native/src/widget/radio.rs
index 4935569f..3a1dd386 100644
--- a/native/src/widget/radio.rs
+++ b/native/src/widget/radio.rs
@@ -4,6 +4,7 @@ use crate::layout;
 use crate::mouse;
 use crate::row;
 use crate::text;
+use crate::touch::{self, Touch};
 use crate::{
     Align, Clipboard, Element, Hasher, HorizontalAlignment, Layout, Length,
     Point, Rectangle, Row, Text, VerticalAlignment, Widget,
@@ -160,7 +161,11 @@ where
         _clipboard: Option<&dyn Clipboard>,
     ) -> event::Status {
         match event {
-            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
+            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
+            | Event::Touch(Touch {
+                phase: touch::Phase::Started,
+                ..
+            }) => {
                 if layout.bounds().contains(cursor_position) {
                     messages.push(self.on_click.clone());
 
diff --git a/native/src/widget/scrollable.rs b/native/src/widget/scrollable.rs
index e23ab06a..8c321ee5 100644
--- a/native/src/widget/scrollable.rs
+++ b/native/src/widget/scrollable.rs
@@ -4,6 +4,7 @@ use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
 use crate::overlay;
+use crate::touch::{self, Touch};
 use crate::{
     Align, Clipboard, Column, Element, Hasher, Layout, Length, Point,
     Rectangle, Size, Vector, Widget,
@@ -229,6 +230,26 @@ where
 
                     return event::Status::Captured;
                 }
+                Event::Touch(Touch { phase, .. }) => match phase {
+                    touch::Phase::Started => {
+                        self.state.scroll_box_touched_at =
+                            Some(cursor_position);
+                    }
+                    touch::Phase::Moved => {
+                        if let Some(scroll_box_touched_at) =
+                            self.state.scroll_box_touched_at
+                        {
+                            let delta =
+                                cursor_position.y - scroll_box_touched_at.y;
+                            self.state.scroll(delta, bounds, content_bounds);
+                            self.state.scroll_box_touched_at =
+                                Some(cursor_position);
+                        }
+                    }
+                    touch::Phase::Ended | touch::Phase::Canceled => {
+                        self.state.scroll_box_touched_at = None;
+                    }
+                },
                 _ => {}
             }
         }
@@ -237,12 +258,24 @@ where
             match event {
                 Event::Mouse(mouse::Event::ButtonReleased(
                     mouse::Button::Left,
-                )) => {
+                ))
+                | Event::Touch(Touch {
+                    phase: touch::Phase::Ended,
+                    ..
+                })
+                | Event::Touch(Touch {
+                    phase: touch::Phase::Canceled,
+                    ..
+                }) => {
                     self.state.scroller_grabbed_at = None;
 
                     return event::Status::Captured;
                 }
-                Event::Mouse(mouse::Event::CursorMoved { .. }) => {
+                Event::Mouse(mouse::Event::CursorMoved { .. })
+                | Event::Touch(Touch {
+                    phase: touch::Phase::Moved,
+                    ..
+                }) => {
                     if let (Some(scrollbar), Some(scroller_grabbed_at)) =
                         (scrollbar, self.state.scroller_grabbed_at)
                     {
@@ -264,7 +297,11 @@ where
             match event {
                 Event::Mouse(mouse::Event::ButtonPressed(
                     mouse::Button::Left,
-                )) => {
+                ))
+                | Event::Touch(Touch {
+                    phase: touch::Phase::Started,
+                    ..
+                }) => {
                     if let Some(scrollbar) = scrollbar {
                         if let Some(scroller_grabbed_at) =
                             scrollbar.grab_scroller(cursor_position)
@@ -385,6 +422,7 @@ where
 #[derive(Debug, Clone, Copy, Default)]
 pub struct State {
     scroller_grabbed_at: Option<f32>,
+    scroll_box_touched_at: Option<Point>,
     offset: f32,
 }
 
@@ -439,6 +477,11 @@ impl State {
     pub fn is_scroller_grabbed(&self) -> bool {
         self.scroller_grabbed_at.is_some()
     }
+
+    /// Returns whether the scroll box is currently touched or not.
+    pub fn is_scroll_box_touched(&self) -> bool {
+        self.scroll_box_touched_at.is_some()
+    }
 }
 
 /// The scrollbar of a [`Scrollable`].
diff --git a/native/src/widget/slider.rs b/native/src/widget/slider.rs
index ff39b816..755e6b2b 100644
--- a/native/src/widget/slider.rs
+++ b/native/src/widget/slider.rs
@@ -4,6 +4,7 @@
 use crate::event::{self, Event};
 use crate::layout;
 use crate::mouse;
+use crate::touch::{self, Touch};
 use crate::{
     Clipboard, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
 };
@@ -207,34 +208,43 @@ where
         };
 
         match event {
-            Event::Mouse(mouse_event) => match mouse_event {
-                mouse::Event::ButtonPressed(mouse::Button::Left) => {
-                    if layout.bounds().contains(cursor_position) {
-                        change();
-                        self.state.is_dragging = true;
-
-                        return event::Status::Captured;
-                    }
+            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
+            | Event::Touch(Touch {
+                phase: touch::Phase::Started,
+                ..
+            }) => {
+                if layout.bounds().contains(cursor_position) {
+                    change();
+                    self.state.is_dragging = true;
+
+                    return event::Status::Captured;
                 }
-                mouse::Event::ButtonReleased(mouse::Button::Left) => {
-                    if self.state.is_dragging {
-                        if let Some(on_release) = self.on_release.clone() {
-                            messages.push(on_release);
-                        }
-                        self.state.is_dragging = false;
-
-                        return event::Status::Captured;
+            }
+            Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
+            | Event::Touch(Touch {
+                phase: touch::Phase::Ended,
+                ..
+            }) => {
+                if self.state.is_dragging {
+                    if let Some(on_release) = self.on_release.clone() {
+                        messages.push(on_release);
                     }
-                }
-                mouse::Event::CursorMoved { .. } => {
-                    if self.state.is_dragging {
-                        change();
+                    self.state.is_dragging = false;
 
-                        return event::Status::Captured;
-                    }
+                    return event::Status::Captured;
+                }
+            }
+            Event::Mouse(mouse::Event::CursorMoved { .. })
+            | Event::Touch(Touch {
+                phase: touch::Phase::Moved,
+                ..
+            }) => {
+                if self.state.is_dragging {
+                    change();
+
+                    return event::Status::Captured;
                 }
-                _ => {}
-            },
+            }
             _ => {}
         }
 
diff --git a/native/src/widget/text_input.rs b/native/src/widget/text_input.rs
index 3e637e97..ca71c20c 100644
--- a/native/src/widget/text_input.rs
+++ b/native/src/widget/text_input.rs
@@ -16,6 +16,7 @@ use crate::keyboard;
 use crate::layout;
 use crate::mouse::{self, click};
 use crate::text;
+use crate::touch::{self, Touch};
 use crate::{
     Clipboard, Element, Hasher, Layout, Length, Point, Rectangle, Size, Widget,
 };
@@ -247,7 +248,11 @@ where
         clipboard: Option<&dyn Clipboard>,
     ) -> event::Status {
         match event {
-            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
+            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
+            | Event::Touch(Touch {
+                phase: touch::Phase::Started,
+                ..
+            }) => {
                 let is_clicked = layout.bounds().contains(cursor_position);
 
                 self.state.is_focused = is_clicked;
@@ -321,10 +326,10 @@ where
             Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left)) => {
                 self.state.is_dragging = false;
             }
-            Event::Mouse(mouse::Event::CursorMoved { x, .. }) => {
+            Event::Mouse(mouse::Event::CursorMoved { position }) => {
                 if self.state.is_dragging {
                     let text_layout = layout.children().next().unwrap();
-                    let target = x - text_layout.bounds().x;
+                    let target = position.x - text_layout.bounds().x;
 
                     if target > 0.0 {
                         let value = if self.is_secure {
diff --git a/winit/src/conversion.rs b/winit/src/conversion.rs
index 138bc64d..e6fc4b96 100644
--- a/winit/src/conversion.rs
+++ b/winit/src/conversion.rs
@@ -4,7 +4,9 @@
 //! [`iced_native`]: https://github.com/hecrj/iced/tree/master/native
 use crate::{
     keyboard::{self, KeyCode, Modifiers},
-    mouse, window, Event, Mode, Point,
+    mouse,
+    touch::{self, Touch},
+    window, Event, Mode, Point,
 };
 
 /// Converts a winit window event into an iced event.
@@ -36,8 +38,7 @@ pub fn window_event(
             let position = position.to_logical::<f64>(scale_factor);
 
             Some(Event::Mouse(mouse::Event::CursorMoved {
-                x: position.x as f32,
-                y: position.y as f32,
+                position: Point::new(position.x as f32, position.y as f32),
             }))
         }
         WindowEvent::CursorEntered { .. } => {
@@ -118,6 +119,7 @@ pub fn window_event(
         WindowEvent::HoveredFileCancelled => {
             Some(Event::Window(window::Event::FilesHoveredLeft))
         }
+        WindowEvent::Touch(touch) => Some(Event::Touch(touch_event(*touch))),
         _ => None,
     }
 }
@@ -200,6 +202,25 @@ pub fn cursor_position(
     Point::new(logical_position.x, logical_position.y)
 }
 
+/// Converts a `Touch` from [`winit`] to an [`iced_native`] touch event.
+///
+/// [`winit`]: https://github.com/rust-windowing/winit
+/// [`iced_native`]: https://github.com/hecrj/iced/tree/master/native
+pub fn touch_event(touch: winit::event::Touch) -> Touch {
+    let phase = match touch.phase {
+        winit::event::TouchPhase::Started => touch::Phase::Started,
+        winit::event::TouchPhase::Moved => touch::Phase::Moved,
+        winit::event::TouchPhase::Ended => touch::Phase::Ended,
+        winit::event::TouchPhase::Cancelled => touch::Phase::Canceled,
+    };
+
+    Touch {
+        finger: touch::Finger(touch.id),
+        position: Point::new(touch.location.x as f32, touch.location.y as f32),
+        phase,
+    }
+}
+
 /// Converts a `VirtualKeyCode` from [`winit`] to an [`iced_native`] key code.
 ///
 /// [`winit`]: https://github.com/rust-windowing/winit