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[feat] add vertical pointer edge panning on mobile

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This commit is contained in:
dijunkun
2026-10-18 22:02:17 +08:00
parent b948422bfe
commit acd56dfc29
7 changed files with 138 additions and 21 deletions
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apps/ios/CrossDeskMobile/Input/RemoteTouchInputView.swift
+64 -8
View File
@@ -52,6 +52,14 @@ enum RemoteVideoGeometry {
height: baseRect.height * scale
)
}
static func verticalPointerOverflow(y: CGFloat, dy: CGFloat, visibleRect: CGRect) -> CGFloat {
guard !visibleRect.isNull, !visibleRect.isEmpty else { return 0 }
if dy > 0 { return min(dy, max(0, y + dy - visibleRect.maxY)) }
if dy < 0 { return max(dy, min(0, y + dy - visibleRect.minY)) }
return 0
}
}
struct RemoteTouchInputView: UIViewRepresentable {
@@ -90,7 +98,15 @@ struct RemoteTouchInputView: UIViewRepresentable {
}
final class RemoteTouchSurface: UIView, UIGestureRecognizerDelegate {
var mouseInput: RemoteMouseInput?
var mouseInput: RemoteMouseInput? {
didSet {
guard oldValue !== mouseInput else { return }
oldValue?.relativeMotion = nil
mouseInput?.relativeMotion = { [weak self] dx, dy in
_ = self?.updateRelativeCursor(by: CGPoint(x: CGFloat(dx), y: CGFloat(dy)))
}
}
}
private var gestureRevisions: [ObjectIdentifier: UInt64] = [:]
var videoSize = CGSize.zero {
didSet { setNeedsLayout() }
@@ -128,10 +144,13 @@ final class RemoteTouchSurface: UIView, UIGestureRecognizerDelegate {
private var hoverLastLocation: CGPoint?
private var viewportScale: CGFloat = 1
private var viewportOffset = CGSize.zero
private var edgePanned = false
private var needsViewportRestore = true
private var pinchActive = false
private var viewportPanActive = false
private let relativePointerSpeed: CGFloat = 1.35
private let maximumViewportScale: CGFloat = 10
private let minimumVisibleHeightFraction: CGFloat = 0.2
override init(frame: CGRect) {
super.init(frame: frame)
@@ -187,6 +206,7 @@ final class RemoteTouchSurface: UIView, UIGestureRecognizerDelegate {
override func layoutSubviews() {
super.layoutSubviews()
if needsViewportRestore { restoreEdgePanAllowance() }
mouseInput?.viewportSize = renderRect()?.size ?? .zero
let constrained = constrainedViewportOffset(viewportOffset,
scale: viewportScale)
@@ -198,10 +218,22 @@ final class RemoteTouchSurface: UIView, UIGestureRecognizerDelegate {
func setViewport(scale: CGFloat, offset: CGSize) {
let nextScale = min(max(scale, 1), maximumViewportScale)
viewportScale = nextScale
if nextScale == 1 && offset == .zero { edgePanned = false }
viewportOffset = offset
if needsViewportRestore { restoreEdgePanAllowance() }
viewportOffset = constrainedViewportOffset(offset, scale: nextScale)
mouseInput?.viewportSize = renderRect()?.size ?? .zero
}
private func restoreEdgePanAllowance() {
// SwiftUI can restore state before assigning the new surface's bounds.
guard let baseRect = baseRenderRect() else { return }
needsViewportRestore = false
if abs(viewportOffset.height) > baseRect.height * (viewportScale - 1) / 2 {
edgePanned = true
}
}
func synchronizeRemoteCursor(_ position: CGPoint?, revision: UInt64) {
// SwiftUI refreshes this view for video frames and shape-only feedback
// too. Consume each position update once, even when it arrives during
@@ -369,7 +401,7 @@ final class RemoteTouchSurface: UIView, UIGestureRecognizerDelegate {
pinchActive = false
if viewportScale <= 1.001 {
viewportScale = 1
viewportOffset = .zero
viewportOffset = constrainedViewportOffset(viewportOffset, scale: 1)
publishViewport()
}
default:
@@ -514,10 +546,24 @@ final class RemoteTouchSurface: UIView, UIGestureRecognizerDelegate {
private func updateRelativeCursor(by translation: CGPoint) -> (Float, Float)? {
guard let renderRect = renderRect(),
renderRect.width > 0, renderRect.height > 0 else { return nil }
let nextX = CGFloat(relativeCursorPoint.0) +
translation.x / renderRect.width * relativePointerSpeed
let nextY = CGFloat(relativeCursorPoint.1) +
translation.y / renderRect.height * relativePointerSpeed
let delta = CGPoint(x: translation.x * relativePointerSpeed,
y: translation.y * relativePointerSpeed)
guard delta.x.isFinite, delta.y.isFinite else { return nil }
let cursorY = renderRect.minY + CGFloat(relativeCursorPoint.1) * renderRect.height
let overflowY = RemoteVideoGeometry.verticalPointerOverflow(
y: cursorY, dy: delta.y, visibleRect: renderRect.intersection(bounds))
if overflowY != 0 {
edgePanned = true
let proposedOffset = CGSize(width: viewportOffset.width,
height: viewportOffset.height - overflowY)
let nextOffset = constrainedViewportOffset(proposedOffset, scale: viewportScale)
if nextOffset != viewportOffset {
viewportOffset = nextOffset
publishViewport()
}
}
let nextX = CGFloat(relativeCursorPoint.0) + delta.x / renderRect.width
let nextY = CGFloat(relativeCursorPoint.1) + delta.y / renderRect.height
relativeCursorPoint = (
Float(min(max(nextX, 0), 1)),
Float(min(max(nextY, 0), 1))
@@ -549,10 +595,20 @@ final class RemoteTouchSurface: UIView, UIGestureRecognizerDelegate {
scale: CGFloat) -> CGSize {
guard let baseRect = baseRenderRect() else { return offset }
let maximumX = max(0, baseRect.width * (scale - 1) / 2)
let maximumY = max(0, baseRect.height * (scale - 1) / 2)
var minimumY = -max(0, baseRect.height * (scale - 1) / 2)
var maximumY = -minimumY
if edgePanned {
// Reserve 20% of the viewport height at any zoom; keep the entire
// image visible when its height is below that minimum.
let visibleHeight = min(baseRect.height * scale,
bounds.height * minimumVisibleHeightFraction)
let halfHeight = baseRect.height * scale / 2
minimumY = visibleHeight - baseRect.midY - halfHeight
maximumY = bounds.height - visibleHeight - baseRect.midY + halfHeight
}
return CGSize(
width: min(max(offset.width, -maximumX), maximumX),
height: min(max(offset.height, -maximumY), maximumY)
height: min(max(offset.height, minimumY), maximumY)
)
}