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Merge pull request #624 from morning4coffe-dev/dev/doti/tip-calc
Migrate `TipCalc` sample
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‎10.0/Apps/TipCalc/README.md‎

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---
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name: .NET MAUI - TipCalc
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description: TipCalc is based on an existing iOS and Android sample but has been completely rewritten for .NET MAUI using XAML and data-binding.
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page_type: sample
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languages:
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- csharp
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- xaml
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products:
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- maui
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urlFragment: tipcalc
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---
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# TipCalc
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TipCalc is based on an existing iOS and Android sample but has been completely rewritten for .NET MAUI
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using XAML and data-binding. This new version now builds for iOS, Android, Windows, and Mac Catalyst.
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TipCalc lets you type in a food-and-drink subtotal
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and a post-tax total from your restaurant bill and then select a tip percentage. It applies the percentage
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to the food-and-drink subtotal and adds the result to the post-tax total, rounded to the nearest quarter.
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The calculations are handled in a *TipCalcModel* class, and the entire user interface is realized in
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XAML in the TipCalcPage.xaml file. Two data-binding value converters help massage the data between the data model and the XAML file.
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![TipCalc application screenshot](Screenshots/tip-calc.png "TipCalc application screenshot")
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‎10.0/Apps/TipCalc/Screenshots/tip-calc.png‎

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‎10.0/Apps/TipCalc/TipCalc.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.14.36221.1 d17.14
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TipCalc", "TipCalc\TipCalc.csproj", "{0251031F-61EE-4CC8-997A-1448E7371A7A}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{0251031F-61EE-4CC8-997A-1448E7371A7A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{0251031F-61EE-4CC8-997A-1448E7371A7A}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{0251031F-61EE-4CC8-997A-1448E7371A7A}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{0251031F-61EE-4CC8-997A-1448E7371A7A}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {35478027-B00E-4FDC-B290-9BA0281F02F1}
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EndGlobalSection
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EndGlobal

‎10.0/Apps/TipCalc/TipCalc/App.xaml‎

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<?xml version = "1.0" encoding = "UTF-8" ?>
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<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:local="clr-namespace:TipCalc"
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x:Class="TipCalc.App">
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<Application.Resources>
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<ResourceDictionary>
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<ResourceDictionary.MergedDictionaries>
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<ResourceDictionary Source="Resources/Styles/Colors.xaml" />
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<ResourceDictionary Source="Resources/Styles/Styles.xaml" />
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</ResourceDictionary.MergedDictionaries>
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</ResourceDictionary>
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</Application.Resources>
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</Application>

‎10.0/Apps/TipCalc/TipCalc/App.xaml.cs‎

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namespace TipCalc;
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public partial class App : Application
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{
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public App()
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{
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InitializeComponent();
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}
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protected override Window CreateWindow(IActivationState? activationState)
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{
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return new Window(new TipCalcPage());
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}
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}

‎10.0/Apps/TipCalc/TipCalc/DoubleRoundingConverter.cs‎

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using System.Globalization;
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namespace TipCalc;
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public class DoubleRoundingConverter : IValueConverter
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{
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public object? Convert(object? value, Type targetType,
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object? parameter, CultureInfo culture)
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{
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return Round(value is double d ? d : 0, parameter);
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}
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public object? ConvertBack(object? value, Type targetType,
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object? parameter, CultureInfo culture)
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{
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return Round(value is double d ? d : 0, parameter);
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}
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double Round(double number, object? parameter)
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{
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double precision = 1;
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// Assume parameter is string encoding precision.
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if (parameter is string s && double.TryParse(s, out var parsed))
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{
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precision = parsed;
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}
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return precision * Math.Round(number / precision);
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}
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}

‎10.0/Apps/TipCalc/TipCalc/DoubleToStringConverter.cs‎

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using System.Globalization;
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namespace TipCalc;
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public class DoubleToStringConverter : IValueConverter
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{
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public object Convert(object? value, Type targetType,
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object? parameter, CultureInfo culture)
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{
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// Assumes value is double.
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double number = value is double d ? d : 0;
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// Return empty string for a zero (good for Entry views).
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if (number == 0)
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{
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return "";
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}
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return number.ToString();
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}
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public object? ConvertBack(object? value, Type targetType,
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object? parameter, CultureInfo culture)
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{
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double number = 0;
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Double.TryParse(value as string, out number);
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return number;
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}
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}

‎10.0/Apps/TipCalc/TipCalc/MauiProgram.cs‎

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using Microsoft.Extensions.Logging;
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namespace TipCalc;
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public static class MauiProgram
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{
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public static MauiApp CreateMauiApp()
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{
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var builder = MauiApp.CreateBuilder();
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builder
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.UseMauiApp<App>()
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.ConfigureFonts(fonts =>
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{
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fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
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fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
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});
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#if DEBUG
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builder.Logging.AddDebug();
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#endif
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return builder.Build();
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}
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}

‎10.0/Apps/TipCalc/TipCalc/Platforms/Android/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
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<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
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<uses-permission android:name="android.permission.INTERNET" />
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</manifest>

‎10.0/Apps/TipCalc/TipCalc/Platforms/Android/MainActivity.cs‎

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using Android.App;
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using Android.Content.PM;
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using Android.OS;
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namespace TipCalc
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{
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[Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, LaunchMode = LaunchMode.SingleTop, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
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public class MainActivity : MauiAppCompatActivity
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{
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}
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}

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