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Add Apple Pencil support on iOS with force, altitude, and azimuth dat… #4449

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Add Apple Pencil support on iOS with force, altitude, and azimuth dat…
bytesandwich Dec 21, 2025
250dc75
Merge branch 'master' into master
bytesandwich Dec 21, 2025
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75 changes: 57 additions & 18 deletions winit-uikit/src/view.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,8 @@ use objc2_ui_kit::{
};
use tracing::debug;
use winit_core::event::{
ButtonSource, ElementState, FingerId, Force, KeyEvent, PointerKind, PointerSource, TouchPhase,
WindowEvent,
ButtonSource, ElementState, FingerId, Force, KeyEvent, PointerKind, PointerSource,
TabletToolAngle, TabletToolButton, TabletToolData, TabletToolKind, TouchPhase, WindowEvent,
};
use winit_core::keyboard::{Key, KeyCode, KeyLocation, NamedKey, NativeKeyCode, PhysicalKey};

Expand Down Expand Up @@ -461,19 +461,18 @@ impl WinitView {
let window = self.window().unwrap();
let mut touch_events = Vec::new();
for touch in touches {
if let UITouchType::Pencil = touch.r#type() {
continue;
}

let logical_location = touch.locationInView(None);
let touch_type = touch.r#type();
let force = if let UITouchType::Pencil = touch_type {
None
} else if available!(ios = 9.0, tvos = 9.0, visionos = 1.0) {
let trait_collection = self.traitCollection();
let touch_capability = trait_collection.forceTouchCapability();
// Both the OS _and_ the device need to be checked for force touch support.
if touch_capability == UIForceTouchCapability::Available {
let force = if available!(ios = 9.0, tvos = 9.0, visionos = 1.0) {
let use_force = match touch_type {
UITouchType::Pencil => true,
_ => {
let trait_collection = self.traitCollection();
trait_collection.forceTouchCapability() == UIForceTouchCapability::Available
},
};

if use_force {
let force = touch.force();
let max_possible_force = touch.maximumPossibleForce();
Some(Force::Calibrated {
Expand Down Expand Up @@ -529,7 +528,7 @@ impl WinitView {
primary,
position,
kind: if let UITouchType::Pencil = touch_type {
PointerKind::Unknown
PointerKind::TabletTool(TabletToolKind::Pencil)
} else {
PointerKind::Touch(finger_id)
},
Expand All @@ -543,7 +542,12 @@ impl WinitView {
state: ElementState::Pressed,
position,
button: if let UITouchType::Pencil = touch_type {
ButtonSource::Unknown(0)
let tool_data = self.tablet_tool_data_for_pencil(&touch);
ButtonSource::TabletTool {
kind: TabletToolKind::Pencil,
button: TabletToolButton::Contact,
data: tool_data,
}
} else {
ButtonSource::Touch { finger_id, force }
},
Expand All @@ -552,7 +556,11 @@ impl WinitView {
},
UITouchPhase::Moved => {
let (primary, source) = if let UITouchType::Pencil = touch_type {
(true, PointerSource::Unknown)
let tool_data = self.tablet_tool_data_for_pencil(&touch);
(true, PointerSource::TabletTool {
kind: TabletToolKind::Pencil,
data: tool_data,
})
} else {
(ivars.primary_finger.get().unwrap() == finger_id, PointerSource::Touch {
finger_id,
Expand Down Expand Up @@ -592,7 +600,12 @@ impl WinitView {
state: ElementState::Released,
position,
button: if let UITouchType::Pencil = touch_type {
ButtonSource::Unknown(0)
let tool_data = self.tablet_tool_data_for_pencil(&touch);
ButtonSource::TabletTool {
kind: TabletToolKind::Pencil,
button: TabletToolButton::Contact,
data: tool_data,
}
} else {
ButtonSource::Touch { finger_id, force }
},
Expand All @@ -607,7 +620,7 @@ impl WinitView {
primary,
position: Some(position),
kind: if let UITouchType::Pencil = touch_type {
PointerKind::Unknown
PointerKind::TabletTool(TabletToolKind::Pencil)
} else {
PointerKind::Touch(finger_id)
},
Expand All @@ -621,6 +634,32 @@ impl WinitView {
app_state::handle_nonuser_events(mtm, touch_events);
}

fn tablet_tool_data_for_pencil(&self, touch: &UITouch) -> TabletToolData {
let force = if available!(ios = 9.0, tvos = 9.0, visionos = 1.0) {
let force_val = touch.force();
let max_force = touch.maximumPossibleForce();
Some(Force::Calibrated { force: force_val as _, max_possible_force: max_force as _ })
} else {
None
};

let angle = if available!(ios = 9.1, visionos = 1.0) {
let altitude = touch.altitudeAngle();
let azimuth = touch.azimuthAngleInView(Some(self));
Some(TabletToolAngle { altitude: altitude as _, azimuth: azimuth as _ })
} else {
None
};

TabletToolData {
force,
tangential_force: None, // iOS doesn't provide barrel pressure
twist: None, // iOS doesn't provide rotation/twist
tilt: None, // Will be calculated from angle if needed
angle,
}
}

fn handle_insert_text(&self, text: &NSString) {
let window = self.window().unwrap();
let window_id = window.id();
Expand Down
1 change: 1 addition & 0 deletions winit/src/changelog/unreleased.md
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ changelog entry.
### Added

- Add `keyboard` support for OpenHarmony.
- On iOS, add Apple Pencil support with force, altitude, and azimuth data.

### Fixed

Expand Down
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