用相同的 sgcUI API 从 WinForms 和 WPF 迁移到 Avalonia

// the grid columns, grouped by Region, with a sum of Amount in the
// footer and in every group row; TsgcGridColumns is the Columns of
// TsgcWinFormsGrid, TsgcWpfGrid and TsgcAvaloniaGrid
public static void ConfigureGrid(TsgcGridColumns aColumns)
{
    aColumns.BeginUpdate();
    try
    {
        aColumns.Clear();
        aColumns.Add(nameof(TOrder.Id), "Order", TsgcGridDataType.gdtInteger).Width = 80;
        aColumns.Add(nameof(TOrder.Customer), "Customer").Width = 180;
        aColumns.Add(nameof(TOrder.Region), "Region").GroupIndex = 0;
        TsgcGridColumn oDate = aColumns.Add(nameof(TOrder.Date), "Date", TsgcGridDataType.gdtDateTime);
        oDate.Width = 110;
        oDate.DisplayFormat = "yyyy-mm-dd";
        TsgcGridColumn oAmount = aColumns.Add(nameof(TOrder.Amount), "Amount", TsgcGridDataType.gdtFloat);
        oAmount.Width = 120;
        oAmount.DisplayFormat = "#,##0.00";
        oAmount.SummaryType = TsgcGridSummaryType.gsuSum;
        oAmount.SummaryFormat = "\"Total: \"#,##0.00";
        aColumns.Add(nameof(TOrder.Status), "Status").Width = 100;
    }
    finally
    {
        aColumns.EndUpdate();
    }
}

// the chart model: one pie series fed by RegionTotals through the
// items data source (live: a changed Amount updates its slice)
Chart = new TsgcChart();
Chart.Title.Text = "Amount by region";
Chart.Title.Visible = true;
Chart.Legend.Position = TsgcChartLegendPosition.clpTop;
Pie = new TsgcChartSeries_Pie();
Pie.Title = "Amount";
Pie.Chart = Chart;
FChartSource = new TsgcChartDataSource_Items();
FChartSource.Series = Pie;
FChartSource.LabelMember = nameof(TRegionTotal.Region);
FChartSource.YMember = nameof(TRegionTotal.Amount);
FChartSource.Items = RegionTotals;

// the theme of every sgcUI control of the application (their Theme is
// utDefault, so they follow sgcUIApplication.Theme), and one accent
public static void ApplyTheme()
{
    sgcUIApplication.Theme = TsgcUITheme.utLight;
    sgcUIApplication.AccentColor = 0xFF2563EB;
}

// aPost runs an action on the UI thread; it is the only host specific
// service of the layer (WinForms Control.BeginInvoke, WPF
// Dispatcher.BeginInvoke, Avalonia Dispatcher.UIThread.Post)
public TMigrateModel(Action<Action> aPost)

// a feed on a worker thread: the order is built there and posted to the
// UI thread with aPost, because bound collections change on the UI thread
public Task AddOrderFromWorker()
{
    return Task.Run(() =>
    {
        TOrder oOrder = DoNewOrder();
        FPost(() => DoAdd(oOrder));
    });
}

// HOST: the WinForms control types
private readonly TsgcWinFormsGrid FGrid;
private readonly TsgcWinFormsChart FChart;
private readonly TsgcWinFormsScheduler FScheduler;

// HOST: the WPF control types
private readonly TsgcWpfGrid FGrid;
private readonly TsgcWpfChart FChart;
private readonly TsgcWpfScheduler FScheduler;

// HOST: the Avalonia control types
private readonly TsgcAvaloniaGrid FGrid;
private readonly TsgcAvaloniaChart FChart;
private readonly TsgcAvaloniaScheduler FScheduler;

// HOST: WinForms reaches the UI thread with Control.BeginInvoke
FModel = new TMigrateModel(aAction => BeginInvoke(aAction));

// SAME on every host: the shared columns, footer and group sums
TMigrateModel.ConfigureGrid(FGrid.Columns);
FGrid.ShowFooter = true;
FGrid.GroupSummaries = true;
// HOST: WinForms binds with DataSource (WPF and Avalonia: ItemsSource)
FGrid.DataSource = FModel.Orders;
// SAME on every host: the shared chart model and planner data
FChart.Chart = FModel.Chart;
TMigrateModel.ConfigureScheduler(FScheduler.Options);
FScheduler.Data = FModel.Planner;
FScheduler.View = TsgcPlannerSchedulerViewKind.psvWorkWeek;
FScheduler.Date = TMigrateModel.CS_WEEK;

// HOST: WPF reaches the UI thread with Dispatcher.BeginInvoke
FModel = new TMigrateModel(aAction => Dispatcher.BeginInvoke(aAction));

// SAME on every host: the shared columns, footer and group sums
TMigrateModel.ConfigureGrid(FGrid.Columns);
FGrid.ShowFooter = true;
FGrid.GroupSummaries = true;
// HOST: WPF binds with ItemsSource (WinForms: DataSource)
FGrid.ItemsSource = FModel.Orders;
// SAME on every host: the shared chart model and planner data
FChart.Chart = FModel.Chart;
TMigrateModel.ConfigureScheduler(FScheduler.Options);
FScheduler.Data = FModel.Planner;
FScheduler.View = TsgcPlannerSchedulerViewKind.psvWorkWeek;
FScheduler.Date = TMigrateModel.CS_WEEK;

// HOST: Avalonia reaches the UI thread with Dispatcher.UIThread.Post
FModel = new TMigrateModel(aAction => Dispatcher.UIThread.Post(aAction));

// SAME on every host: the shared columns, footer and group sums
TMigrateModel.ConfigureGrid(FGrid.Columns);
FGrid.ShowFooter = true;
FGrid.GroupSummaries = true;
// HOST: Avalonia binds with ItemsSource, as WPF (WinForms: DataSource)
FGrid.ItemsSource = FModel.Orders;
// SAME on every host: the shared chart model and planner data
FChart.Chart = FModel.Chart;
TMigrateModel.ConfigureScheduler(FScheduler.Options);
FScheduler.Data = FModel.Planner;
FScheduler.View = TsgcPlannerSchedulerViewKind.psvWorkWeek;
FScheduler.Date = TMigrateModel.CS_WEEK;

// HOST: the WinForms application start
Application.SetHighDpiMode(HighDpiMode.SystemAware);
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
// SAME on every host: one theme for every sgcUI control
TMigrateModel.ApplyTheme();
TMigrateForm oForm = new TMigrateForm(vTest ? vFolder : null);
Application.Run(oForm);
return oForm.ExitCode;

// HOST: the WPF application start
Application oApp = new Application { ShutdownMode = ShutdownMode.OnMainWindowClose };
// SAME on every host: one theme for every sgcUI control
TMigrateModel.ApplyTheme();
TMigrateWindow oWindow = new TMigrateWindow(vTest ? vFolder : null);
oApp.Run(oWindow);
return oWindow.ExitCode;

// HOST: Avalonia needs an Application class with a theme
internal sealed class TMigrateApp : Application
{
    public static string TestFolder;

    public override void Initialize()
    {
        Styles.Add(new FluentTheme());
        RequestedThemeVariant = ThemeVariant.Light;
    }

    public override void OnFrameworkInitializationCompleted()
    {
        // SAME on every host: one theme for every sgcUI control
        TMigrateModel.ApplyTheme();
        IClassicDesktopStyleApplicationLifetime oDesktop =
            ApplicationLifetime as IClassicDesktopStyleApplicationLifetime;
        if (oDesktop != null)
            oDesktop.MainWindow = new TMigrateWindow(TestFolder);
        base.OnFrameworkInitializationCompleted();
    }
}