■ ItemsRepeater 엘리먼트의 Layout 속성에서 VirtualizingLayout 상속 객체를 만들어 가상화/스크롤 가능한 커스텀 레이아웃을 사용하는 방법을 보여준다.
▶ ActivityFeedLayoutState.cs
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using System.Collections.Generic; using Windows.Foundation; namespace TestProject { /// <summary> /// 활동 피드 레이아웃 상태 /// </summary> public class ActivityFeedLayoutState { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 레이아웃 사각형 리스트 /// </summary> private List<Rect> layoutRectList; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Publoc #region 첫번째 실현 인덱스 - FirstRealizedIndex /// <summary> /// 첫번째 실현 인덱스 /// </summary> public int FirstRealizedIndex { get; set; } #endregion #region 레이아웃 사각형 리스트 - LayoutRectList /// <summary> /// 레이아웃 사각형 리스트 /// </summary> public List<Rect> LayoutRectList { get { if(this.layoutRectList == null) { this.layoutRectList = new List<Rect>(); } return this.layoutRectList; } } #endregion } } |
▶ ActivityFeedLayout.cs
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using System; using Windows.Foundation; using Microsoft.UI.Xaml.Controls; using Microsoft.UI.Xaml; namespace TestProject { /// <summary> /// 활동 피드 레이아웃 /// </summary> public class ActivityFeedLayout : VirtualizingLayout { //////////////////////////////////////////////////////////////////////////////////////////////////// Dependency Property ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 행 간격 속성 - RowSpacingProperty /// <summary> /// 행 간격 속성 /// </summary> public static readonly DependencyProperty RowSpacingProperty = DependencyProperty.Register ( "RowSpacing", typeof(double), typeof(ActivityFeedLayout), new PropertyMetadata(0, PropertyChangedCallback) ); #endregion #region 열 간격 속성 - ColumnSpacingProperty /// <summary> /// 열 간격 속성 /// </summary> public static readonly DependencyProperty ColumnSpacingProperty = DependencyProperty.Register ( "ColumnSpacing", typeof(double), typeof(ActivityFeedLayout), new PropertyMetadata(0, PropertyChangedCallback) ); #endregion #region 최소 항목 크기 속성 - MinimumItemSizeProperty /// <summary> /// 최소 항목 크기 속성 /// </summary> public static readonly DependencyProperty MinimumItemSizeProperty = DependencyProperty.Register ( "MinimumItemSize", typeof(Size), typeof(ActivityFeedLayout), new PropertyMetadata(Size.Empty, PropertyChangedCallback) ); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 행 간격 /// </summary> private double rowSpacing; /// <summary> /// 열 간격 /// </summary> private double columnSpacing; /// <summary> /// 최소 항목 크기 /// </summary> private Size minimumItemSize = Size.Empty; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 행 간격 - RowSpacing /// <summary> /// 행 간격 /// </summary> public double RowSpacing { get { return this.rowSpacing; } set { SetValue(RowSpacingProperty, value); } } #endregion #region 열 간격 - ColumnSpacing /// <summary> /// 열 간격 /// </summary> public double ColumnSpacing { get { return this.columnSpacing; } set { SetValue(ColumnSpacingProperty, value); } } #endregion #region 최소 항목 크기 - MinimumItemSize /// <summary> /// 최소 항목 크기 /// </summary> public Size MinimumItemSize { get { return this.minimumItemSize; } set { SetValue(MinimumItemSizeProperty, value); } } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 속성 변경시 콜백 처리하기 - PropertyChangedCallback(d, e) /// <summary> /// 속성 변경시 콜백 처리하기 /// </summary> /// <param name="d">의존 객체</param> /// <param name="e">이벤트 인자</param> private static void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e) { ActivityFeedLayout layout = d as ActivityFeedLayout; if(e.Property == RowSpacingProperty) { layout.rowSpacing = (double)e.NewValue; } else if(e.Property == ColumnSpacingProperty) { layout.columnSpacing = (double)e.NewValue; } else if(e.Property == MinimumItemSizeProperty) { layout.minimumItemSize = (Size)e.NewValue; } else { throw new InvalidOperationException("Don't know what you are talking about!"); } layout.InvalidateMeasure(); } #endregion ////////////////////////////////////////////////////////////////////////////////////////// Instance //////////////////////////////////////////////////////////////////////////////// Protected #region 컨텍스트용 초기화하기 (코어) - InitializeForContextCore(context) /// <summary> /// 컨텍스트용 초기화하기 (코어) /// </summary> /// <param name="context">가상화 레이아웃 컨텍스트</param> protected override void InitializeForContextCore(VirtualizingLayoutContext context) { base.InitializeForContextCore(context); if(!(context.LayoutState is ActivityFeedLayoutState)) { context.LayoutState = new ActivityFeedLayoutState(); } } #endregion #region 컨텍스트용 초기화 취소하기 (코어) - UninitializeForContextCore(context) /// <summary> /// 컨텍스트용 초기화 취소하기 (코어) /// </summary> /// <param name="context">가상화 레이아웃 컨텍스트</param> protected override void UninitializeForContextCore(VirtualizingLayoutContext context) { base.UninitializeForContextCore(context); context.LayoutState = null; } #endregion #region 측정하기 (오버라이드) - MeasureOverride(context, availableSize) /// <summary> /// 측정하기 (오버라이드) /// </summary> /// <param name="context">가상화 레이아웃 컨텍스트</param> /// <param name="availableSize">이용 가능한 크기</param> /// <returns>측정 크기</returns> protected override Size MeasureOverride(VirtualizingLayoutContext context, Size availableSize) { if(MinimumItemSize == Size.Empty) { UIElement firstElement = context.GetOrCreateElementAt(0); firstElement.Measure(new Size(float.PositiveInfinity, float.PositiveInfinity)); this.minimumItemSize = firstElement.DesiredSize; } int firstRowIndex = Math.Max ( (int)(context.RealizationRect.Y / (MinimumItemSize.Height + RowSpacing)) - 1, 0 ); int lastRowIndex = Math.Min ( (int)(context.RealizationRect.Bottom / (this.MinimumItemSize.Height + this.RowSpacing)) + 1, (int)(context.ItemCount / 3) ); ActivityFeedLayoutState state = context.LayoutState as ActivityFeedLayoutState; state.LayoutRectList.Clear(); state.FirstRealizedIndex = firstRowIndex * 3; double desiredItemWidth = Math.Max ( this.MinimumItemSize.Width, (availableSize.Width - ColumnSpacing * 3) / 4 ); for(int rowIndex = firstRowIndex; rowIndex < lastRowIndex; rowIndex++) { int firstItemIndex = rowIndex * 3; Rect[] boundRectangleArrayForCurrentRow = CalculateLayoutBoundRectangleArrayForRow(rowIndex, desiredItemWidth); for(int columnIndex = 0; columnIndex < 3; columnIndex++) { int index = firstItemIndex + columnIndex; UIElement containerElement = context.GetOrCreateElementAt(index); containerElement.Measure ( new Size ( boundRectangleArrayForCurrentRow[columnIndex].Width, boundRectangleArrayForCurrentRow[columnIndex].Height ) ); state.LayoutRectList.Add(boundRectangleArrayForCurrentRow[columnIndex]); } } double extentHeight; if(context.ItemCount == 0) { extentHeight = 0; } else { extentHeight = ((int)(context.ItemCount / 3) - 1) * (MinimumItemSize.Height + RowSpacing) + MinimumItemSize.Height; } return new Size(desiredItemWidth * 4 + this.ColumnSpacing * 2, extentHeight); } #endregion #region 배치하기 (오버라이드) - ArrangeOverride(context, finalSize) /// <summary> /// 배치하기 (오버라이드) /// </summary> /// <param name="context">가상화 레이아웃 컨텍스트</param> /// <param name="finalSize">최종 크기</param> /// <returns>배치 크기</returns> protected override Size ArrangeOverride(VirtualizingLayoutContext context, Size finalSize) { ActivityFeedLayoutState state = context.LayoutState as ActivityFeedLayoutState; VirtualizingLayoutContext virtualContext = context as VirtualizingLayoutContext; int currentIndex = state.FirstRealizedIndex; foreach(Rect arrangeRect in state.LayoutRectList) { UIElement containerElement = virtualContext.GetOrCreateElementAt(currentIndex); containerElement.Arrange(arrangeRect); currentIndex++; } return finalSize; } #endregion //////////////////////////////////////////////////////////////////////////////// Private #region 행을 위한 레이아웃 경계 사각형 배열 계산하기 - CalculateLayoutBoundRectangleArrayForRow(rowIndex, desiredItemWidth) /// <summary> /// 행을 위한 레이아웃 경계 사각형 배열 계산하기 /// </summary> /// <param name="rowIndex">행 인덱스</param> /// <param name="desiredItemWidth">희망 항목 너비</param> /// <returns>레이아웃 경계 사각형 배열</returns> private Rect[] CalculateLayoutBoundRectangleArrayForRow(int rowIndex, double desiredItemWidth) { Rect[] boundRectangeArrayForRow = new Rect[3]; double yoffset = rowIndex * (MinimumItemSize.Height + RowSpacing); boundRectangeArrayForRow[0].Y = boundRectangeArrayForRow[1].Y = boundRectangeArrayForRow[2].Y = yoffset; boundRectangeArrayForRow[0].Height = boundRectangeArrayForRow[1].Height = boundRectangeArrayForRow[2].Height = MinimumItemSize.Height; if(rowIndex % 2 == 0) { boundRectangeArrayForRow[0].X = 0; boundRectangeArrayForRow[0].Width = desiredItemWidth; boundRectangeArrayForRow[1].X = boundRectangeArrayForRow[0].Right + ColumnSpacing; boundRectangeArrayForRow[1].Width = desiredItemWidth; boundRectangeArrayForRow[2].X = boundRectangeArrayForRow[1].Right + ColumnSpacing; boundRectangeArrayForRow[2].Width = desiredItemWidth * 2 + ColumnSpacing; } else { boundRectangeArrayForRow[0].X = 0; boundRectangeArrayForRow[0].Width = (desiredItemWidth * 2 + ColumnSpacing); boundRectangeArrayForRow[1].X = boundRectangeArrayForRow[0].Right + ColumnSpacing; boundRectangeArrayForRow[1].Width = desiredItemWidth; boundRectangeArrayForRow[2].X = boundRectangeArrayForRow[1].Right + ColumnSpacing; boundRectangeArrayForRow[2].Width = desiredItemWidth; } return boundRectangeArrayForRow; } #endregion } } |
▶ CustomDataTemplateSelector.cs
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using Microsoft.UI.Xaml; using Microsoft.UI.Xaml.Controls; namespace TestProject { /// <summary> /// 커스텀 데이터 템플리트 선택자 /// </summary> public class CustomDataTemplateSelector : DataTemplateSelector { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 일반 템플리트 - NormalTemplate /// <summary> /// 일반 템플리트 /// </summary> public DataTemplate NormalTemplate { get; set; } #endregion #region 강조 템플리트 - AccentTemplate /// <summary> /// 강조 템플리트 /// </summary> public DataTemplate AccentTemplate { get; set; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Protected #region 템플리트 선택하기 (코어) - SelectTemplateCore(item) /// <summary> /// 템플리트 선택하기 (코어) /// </summary> /// <param name="item">항목</param> /// <returns>템플리트</returns> protected override DataTemplate SelectTemplateCore(object item) { if((int)item % 2 == 0) { return NormalTemplate; } else { return AccentTemplate; } } #endregion } } |
▶ MainWindow.xaml
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<?xml version="1.0" encoding="utf-8"?> <Window x:Class="TestProject.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:TestProject" Title="TestProject"> <Grid Name="grid" Margin="10"> <Grid.Resources> <DataTemplate x:Key="NormalItemDataTemplateKey" x:DataType="x:Int32"> <Border Background="{ThemeResource SystemControlBackgroundChromeMediumBrush}"> <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="{x:Bind}" /> </Border> </DataTemplate> <DataTemplate x:Key="AccentItemDataTemplateKey" x:DataType="x:Int32"> <Border Background="{ThemeResource SystemControlBackgroundAccentBrush}"> <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="{ThemeResource SystemControlForegroundChromeWhiteBrush}" Text="{x:Bind}" /> </Border> </DataTemplate> <local:CustomDataTemplateSelector x:Key="CustomDataTemplateSelectorKey" NormalTemplate="{StaticResource NormalItemDataTemplateKey}" AccentTemplate="{StaticResource AccentItemDataTemplateKey}" /> <local:ActivityFeedLayout x:Key="ActivityFeedLayoutKey" RowSpacing="10" ColumnSpacing="10" MinimumItemSize="80 110" /> <UniformGridLayout x:Key="UniformGridLayoutKey" MinItemWidth="110" MinItemHeight="110" MinRowSpacing="10" MinColumnSpacing="10" /> </Grid.Resources> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="10" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <Border Grid.Column="0" BorderThickness="1" BorderBrush="Black"> <ScrollViewer Name="scrollViewer" Margin="10" IsVerticalScrollChainingEnabled="False"> <ItemsRepeater Name="repeater" ItemTemplate="{StaticResource CustomDataTemplateSelectorKey}" Layout="{StaticResource ActivityFeedLayoutKey}" HorizontalAlignment="Stretch" /> </ScrollViewer> </Border> <StackPanel Grid.Column="2" HorizontalAlignment="Center" VerticalAlignment="Center" Spacing="10"> <RadioButton Name="uniformGridRadioButton" Tag="UniformGridLayoutKey" Content="Uniform grid" /> <RadioButton Name="customVirtualizingLayoutRadioButton" Tag="ActivityFeedLayoutKey" Content="Custom virtualizing layout" IsChecked="True" /> </StackPanel> </Grid> </Window> |
▶ MainWindow.xaml.cs
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using System.Linq; using Microsoft.UI.Xaml; using Microsoft.UI.Xaml.Controls; namespace TestProject { /// <summary> /// 메인 윈도우 /// </summary> public sealed partial class MainWindow : Window { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainWindow() /// <summary> /// 생성자 /// </summary> public MainWindow() { InitializeComponent(); this.repeater.ItemsSource = Enumerable.Range(0, 500); this.uniformGridRadioButton.Click += layoutRadioButton_Click; this.customVirtualizingLayoutRadioButton.Click += layoutRadioButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region 레이아웃 라디오 버튼 클릭시 처리하기 - layoutRadioButton_Click(sender, e) /// <summary> /// 레이아웃 라디오 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void layoutRadioButton_Click(object sender, RoutedEventArgs e) { string layoutKey = ((FrameworkElement)sender).Tag as string; this.repeater.Layout = this.grid.Resources[layoutKey] as VirtualizingLayout; } #endregion } } |
