taler-ios

commit 5557e0b1ac94d552717ac89cd93e9746af45220d
parent 61610421c7782e5d0f4e096e28f3721d1e55def0
Author: Marc Stibane <marc@taler.net>
Date:   Tue,  2 Sep 2025 01:04:19 +0200

OptimalSize

Diffstat:
A
TalerWallet1/Views/HelperViews/OptimalSize.swift
 | 
71
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 71 insertions(+), 0 deletions(-)
diff --git a/TalerWallet1/Views/HelperViews/OptimalSize.swift b/TalerWallet1/Views/HelperViews/OptimalSize.swift
@@ -0,0 +1,71 @@
+//  MIT License
+//  by Benzy Neez
+//  https://stackoverflow.com/questions/77631146/how-to-make-scrollview-shrink-to-fit-and-take-minimum-space-without-hacks
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+//  and associated documentation files (the "Software"), to deal in the Software without restriction,
+//  including without limitation the rights to use, copy, modify, merge, publish, distribute,
+//  sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all copies or
+//  substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+//  BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+//  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+/**
+ * @author Marc Stibane
+ */
+import SwiftUI
+
+@available(iOS 16.0, *)
+struct OptimalSize: Layout {
+    let axes: Axis.Set
+
+    /// Computes the optimal size for a ScrollView (which would grab all it could get otherwise)
+    /// - Parameters:
+    ///   - axes: Axes this content must fit in.
+    init(_ axes: Axis.Set = [.horizontal, .vertical]) {
+        self.axes = axes
+    }
+
+    public func sizeThatFits(
+        proposal: ProposedViewSize,
+        subviews: Subviews,
+        cache: inout ()
+    ) -> CGSize {
+        let result: CGSize
+        let horz = axes.contains(.horizontal)
+        let vert = axes.contains(.vertical)
+
+        if let firstSubview = subviews.first {
+            let containerWidth = proposal.width ?? .infinity
+            let containerHeight = proposal.height ?? .infinity
+            let size = firstSubview.sizeThatFits(.init(width: vert ? containerWidth : nil,
+                                                       height: horz ? containerHeight : nil))
+            result = CGSize(width: min(size.width, containerWidth),
+                            height: min(size.height, containerHeight))
+        } else {
+            result = .zero
+        }
+        return result
+    }
+
+    public func placeSubviews(
+        in bounds: CGRect,
+        proposal: ProposedViewSize,
+        subviews: Subviews,
+        cache: inout ()
+    ) {
+        if let firstSubview = subviews.first {
+            firstSubview.place(
+                at: CGPoint(x: bounds.minX, y: bounds.minY),
+                proposal: .init(width: bounds.width, height: bounds.height)
+            )
+        }
+    }
+}