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Fix/progess spinner resizing #238

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ba361de
Fixed ProgressViewResizing on AppKitBackend
MiaKoring Oct 25, 2025
660f678
added min height&width to prevent pushing it too small
MiaKoring Oct 25, 2025
6879d40
now the minWidth actually takes effect (max(min(x, y), 10)
MiaKoring Oct 25, 2025
c3bc981
Made ProgressView resizability optional through .resizable()
MiaKoring Oct 28, 2025
4645c19
changed .resizable() to modify a copy instead of Initializing with al…
MiaKoring Oct 28, 2025
b0cc977
formatting and naming
MiaKoring Nov 3, 2025
b615c3c
Merge branch 'stackotter:main' into fix/ProgessSpinnerResizing
MiaKoring Nov 3, 2025
8927187
changing AppKits ProgressSpinner size through replacing it with a spi…
MiaKoring Nov 3, 2025
6d7049a
Added minHeight to ControlsExample to make it not spawn with 0 height…
MiaKoring Nov 3, 2025
ea80229
added a guard to not recreate ProgressSpinners on AppKit when the siz…
MiaKoring Nov 3, 2025
dcfb676
Implemented requested changes
MiaKoring Dec 15, 2025
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116 changes: 61 additions & 55 deletions Examples/Sources/ControlsExample/ControlsApp.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -22,75 +22,81 @@ struct ControlsApp: App {
var body: some Scene {
WindowGroup("ControlsApp") {
#hotReloadable {
VStack(spacing: 30) {
VStack {
Text("Button")
Button("Click me!") {
count += 1
}
Text("Count: \(count)")
}
.padding(.bottom, 20)

#if !canImport(UIKitBackend)
ScrollView {
VStack(spacing: 30) {
VStack {
Text("Toggle button")
Toggle("Toggle me!", active: $exampleButtonState)
.toggleStyle(.button)
Text("Currently enabled: \(exampleButtonState)")
Text("Button")
Button("Click me!") {
count += 1
}
Text("Count: \(count)")
}
.padding(.bottom, 20)
#endif

VStack {
Text("Toggle switch")
Toggle("Toggle me:", active: $exampleSwitchState)
.toggleStyle(.switch)
Text("Currently enabled: \(exampleSwitchState)")
}
#if !canImport(UIKitBackend)
VStack {
Text("Toggle button")
Toggle("Toggle me!", active: $exampleButtonState)
.toggleStyle(.button)
Text("Currently enabled: \(exampleButtonState)")
}
.padding(.bottom, 20)
#endif

#if !canImport(UIKitBackend)
VStack {
Text("Checkbox")
Toggle("Toggle me:", active: $exampleCheckboxState)
.toggleStyle(.checkbox)
Text("Currently enabled: \(exampleCheckboxState)")
Text("Toggle switch")
Toggle("Toggle me:", active: $exampleSwitchState)
.toggleStyle(.switch)
Text("Currently enabled: \(exampleSwitchState)")
}
#endif

VStack {
Text("Slider")
Slider($sliderValue, minimum: 0, maximum: 10)
.frame(maxWidth: 200)
Text("Value: \(String(format: "%.02f", sliderValue))")
}
#if !canImport(UIKitBackend)
VStack {
Text("Checkbox")
Toggle("Toggle me:", active: $exampleCheckboxState)
.toggleStyle(.checkbox)
Text("Currently enabled: \(exampleCheckboxState)")
}
#endif

VStack {
Text("Slider")
Slider($sliderValue, minimum: 0, maximum: 10)
.frame(maxWidth: 200)
Text("Value: \(String(format: "%.02f", sliderValue))")
}

VStack {
Text("Text field")
TextField("Text field", text: $text)
Text("Value: \(text)")
}
VStack {
Text("Text field")
TextField("Text field", text: $text)
Text("Value: \(text)")
}

Toggle("Enable ProgressView resizability", active: $isProgressViewResizable)
Slider($progressViewSize, minimum: 10, maximum: 100)
ProgressView()
.resizable(isProgressViewResizable)
.frame(width: progressViewSize, height: progressViewSize)
Toggle("Enable ProgressView resizability", active: $isProgressViewResizable)
Slider($progressViewSize, minimum: 10, maximum: 100)
Button("Randomize progress view size") {
progressViewSize = Int.random(in: 10...100)
}
ProgressView()
.resizable(isProgressViewResizable)
.frame(width: progressViewSize, height: progressViewSize)

VStack {
Text("Drop down")
HStack {
Text("Flavor: ")
Picker(of: ["Vanilla", "Chocolate", "Strawberry"], selection: $flavor)
VStack {
Text("Drop down")
HStack {
Text("Flavor: ")
Picker(
of: ["Vanilla", "Chocolate", "Strawberry"], selection: $flavor)
}
Text("You chose: \(flavor ?? "Nothing yet!")")
}
Text("You chose: \(flavor ?? "Nothing yet!")")
}
}.padding().disabled(!enabled)
}.padding().disabled(!enabled)

Toggle(enabled ? "Disable all" : "Enable all", active: $enabled)
.padding()
Toggle(enabled ? "Disable all" : "Enable all", active: $enabled)
.padding()
}
.frame(minHeight: 600)
}

}.defaultSize(width: 400, height: 600)
}
}
32 changes: 31 additions & 1 deletion Sources/AppKitBackend/AppKitBackend.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -484,6 +484,15 @@ public final class AppKitBackend: AppBackend {
}

public func naturalSize(of widget: Widget) -> SIMD2<Int> {
if let spinner = widget.subviews.first as? NSProgressIndicator,
spinner.style == .spinning
{
let size = spinner.intrinsicContentSize
return SIMD2(
Int(size.width),
Int(size.height)
)
}
let size = widget.intrinsicContentSize
return SIMD2(
Int(size.width),
Expand Down Expand Up @@ -1181,11 +1190,32 @@ public final class AppKitBackend: AppBackend {
}

public func createProgressSpinner() -> Widget {
let container = NSView()
let spinner = NSProgressIndicator()
spinner.translatesAutoresizingMaskIntoConstraints = false
spinner.isIndeterminate = true
spinner.style = .spinning
spinner.startAnimation(nil)
container.addSubview(spinner)
return container
}

public func setProgressSpinnerSize(
_ widget: Widget,
_ size: SIMD2<Int>
) {
guard Int(widget.frame.size.height) != size.y else { return }
setSize(of: widget, to: size)
let spinner = NSProgressIndicator()
spinner.translatesAutoresizingMaskIntoConstraints = false
spinner.isIndeterminate = true
spinner.style = .spinning
spinner.startAnimation(nil)
return spinner
spinner.widthAnchor.constraint(equalToConstant: CGFloat(size.x)).isActive = true
spinner.heightAnchor.constraint(equalToConstant: CGFloat(size.y)).isActive = true

widget.subviews = []
widget.addSubview(spinner)
}

public func createProgressBar() -> Widget {
Expand Down
16 changes: 16 additions & 0 deletions Sources/SwiftCrossUI/Backend/AppBackend.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -541,6 +541,15 @@ public protocol AppBackend: Sendable {
/// Creates an indeterminate progress spinner.
func createProgressSpinner() -> Widget

/// Changes the Spinner's Size.
/// Required due to AppKitBackend needing special treatment.
/// Forward to ``AppBackend/setSize(of widget: Widget, to size: SIMD2<Int>)``
/// on other Backends.
func setProgressSpinnerSize(
_ widget: Widget,
_ size: SIMD2<Int>
)

/// Creates a progress bar.
func createProgressBar() -> Widget
/// Updates a progress bar to reflect the given progress (between 0 and 1), and the
Expand Down Expand Up @@ -1028,6 +1037,13 @@ extension AppBackend {
todo()
}

public func setProgressSpinnerSize(
_ widget: Widget,
_ size: SIMD2<Int>
) {
setSize(of: widget, to: size)
}

public func createProgressBar() -> Widget {
todo()
}
Expand Down
17 changes: 9 additions & 8 deletions Sources/SwiftCrossUI/Views/ProgressView.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,7 @@ public struct ProgressView<Label: View>: View {
}

/// Makes the ProgressView resize to fit the available space.
/// Only affects `Kind.spinner`.
/// Only affects ``Kind/spinner``.
public func resizable(_ isResizable: Bool = true) -> Self {
var progressView = self
progressView.isSpinnerResizable = isResizable
Expand Down Expand Up @@ -111,6 +111,7 @@ extension ProgressView where Label == Text {

struct ProgressSpinnerView: ElementaryView {
let isResizable: Bool

init(isResizable: Bool = false) {
self.isResizable = isResizable
}
Expand All @@ -130,26 +131,26 @@ struct ProgressSpinnerView: ElementaryView {
guard isResizable else {
// Required to reset its size when resizability
// gets changed at runtime
backend.setSize(of: widget, to: naturalSize)
backend.setProgressSpinnerSize(widget, naturalSize)
return ViewUpdateResult.leafView(size: ViewSize(fixedSize: naturalSize))
}
let min = max(min(proposedSize.x, proposedSize.y), 10)
let minimumDimension = max(min(proposedSize.x, proposedSize.y), 0)
let size = SIMD2(
min,
min
minimumDimension,
minimumDimension
)
if !dryRun {
// Doesn't change the rendered size of ProgressSpinner
// on UIKitBackend, but still sets container size to
// (width: n, height: n) n = min(proposedSize.x, proposedSize.y)
backend.setSize(of: widget, to: size)
backend.setProgressSpinnerSize(widget, size)
}
return ViewUpdateResult.leafView(
size: ViewSize(
size: size,
idealSize: naturalSize,
minimumWidth: 10,
minimumHeight: 10,
minimumWidth: 0,
minimumHeight: 0,
maximumWidth: nil,
maximumHeight: nil
)
Expand Down
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