taler-ios

iOS apps for GNU Taler (wallet)
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View+fitsSideBySide.swift (3516B)

      1 /*
      2  * This file is part of GNU Taler, ©2022-25 Taler Systems S.A.
      3  * See LICENSE.md
      4  */
      5 /**
      6  * @author Marc Stibane
      7  */
      8 import SwiftUI
      9 import UIKit
     10 
     11 extension View {
     12     @MainActor
     13     public func announce(_ this: String) {
     14         if UIAccessibility.isVoiceOverRunning {
     15             UIAccessibility.post(notification: .announcement, argument: this)
     16         }
     17     }
     18     @MainActor
     19     public func setVoice(to this: (any View)?) {
     20         if UIAccessibility.isVoiceOverRunning {
     21             UIAccessibility.post(notification: .layoutChanged, argument: this)
     22         }
     23     }
     24 }
     25 
     26 extension View {
     27     /// if sameSize then this searches for the longest title
     28     /// returns true if any of the strings in 'titles' wouldn't fit in a view 1/'numViews' of the size of 'width', with 'spacing'
     29     /// if !sameSize then all titles are added with spacing
     30     static func fitsSideBySide(_ titles: [(String, UIFont)],
     31                          availableWidth: CGFloat,                       // total width available
     32                            sizeCategory: ContentSizeCategory,
     33                                 spacing: CGFloat = HSPACING,            // between titles
     34                                 padding: CGFloat = 20,
     35                                sameSize: Bool = true,
     36                                numViews: Int = 2)
     37     -> Bool {
     38 //        let padding = 20.0        // TODO: depend on myListStyle
     39         let totalSpacing = spacing * CGFloat(numViews - 1)
     40         var totalWidth = padding + totalSpacing
     41 
     42         var maxTitleWidth = 0.0
     43         var minTitleWidth = 1000.0
     44         for (title, uiFont) in titles {
     45             let titleWidth = title.widthOfString(usingUIFont: uiFont, sizeCategory)
     46             if titleWidth > maxTitleWidth {
     47                 maxTitleWidth = titleWidth
     48             }
     49             if titleWidth < minTitleWidth {
     50                 minTitleWidth = titleWidth
     51             }
     52 //            if availableWidth > 20 {
     53 //                let widthStr = String(format: "%.2f + %.2f = %.2f", totalWidth, titleWidth, totalWidth + titleWidth)
     54 //                print("❗️  \(title)  \(widthStr)")
     55 //            }
     56             totalWidth += titleWidth
     57         }
     58 
     59         if sameSize {
     60             let nettoWidth = availableWidth - totalSpacing
     61             let singleWidth = nettoWidth / CGFloat(numViews)
     62             let neededWidth = padding + maxTitleWidth
     63 //            if availableWidth > 20 {
     64 //                let width1Str = String(format: "%.2f -spacing %.2f = %.2f / %d = %.2f", availableWidth, totalSpacing,
     65 //                                       nettoWidth, numViews, singleWidth)
     66 //                let width2Str = String(format: "%.2f +padding %.2f = %.2f", maxTitleWidth, padding, maxTitleWidth + padding)
     67 //                print("❗️ available: \(width1Str)   needed: \(width2Str)")
     68 //            }
     69             return neededWidth < singleWidth
     70         } else {
     71 //            if availableWidth > 20 {
     72 //                let totalStr = String(format: "%.2f -spacing %.2f = %.2f -padding %.2f = %.2f", totalWidth, totalSpacing,
     73 //                                      totalWidth - totalSpacing, padding, totalWidth - totalSpacing - padding)
     74 //                print("❗️ view width: \(availableWidth)   total: \(totalStr)")
     75 //                let (amount, font) = titles[1]
     76 //                print("❗️ view width: \(width)   total: \(totalStr)  min: \(minTitleWidth)  max: \(maxTitleWidth)  \(amount)")
     77 //            }
     78             return totalWidth < availableWidth
     79         }
     80     }
     81 }