■ CompositionTarget 클래스의 Rendering 정적 이벤트를 사용하는 방법을 보여준다.
▶ MainPage.xaml
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<Page x:Class="TestProject.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}"> <TextBlock Name="textBlock" HorizontalAlignment="Center" VerticalAlignment="Center" FontFamily="CooperBlack" FontSize="2" Text="HELLO"> <TextBlock.Foreground> <LinearGradientBrush x:Name="textBlockForegroundBrush"> <GradientStop Offset="0.00" Color="Red" /> <GradientStop Offset="0.14" Color="Orange" /> <GradientStop Offset="0.28" Color="Yellow" /> <GradientStop Offset="0.43" Color="Green" /> <GradientStop Offset="0.57" Color="Blue" /> <GradientStop Offset="0.71" Color="Indigo" /> <GradientStop Offset="0.86" Color="Violet" /> <GradientStop Offset="1.00" Color="Red" /> <GradientStop Offset="1.14" Color="Orange" /> <GradientStop Offset="1.28" Color="Yellow" /> <GradientStop Offset="1.43" Color="Green" /> <GradientStop Offset="1.57" Color="Blue" /> <GradientStop Offset="1.71" Color="Indigo" /> <GradientStop Offset="1.86" Color="Violet" /> <GradientStop Offset="2.00" Color="Red" /> </LinearGradientBrush> </TextBlock.Foreground> </TextBlock> </Grid> </Page> |
▶ MainPage.xaml.cs
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using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Media; namespace TestProject { /// <summary> /// 메인 페이지 /// </summary> public sealed partial class MainPage : Page { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region Field /// <summary> /// 텍스트 블럭 실제 높이 /// </summary> private double textBlockActualHeight; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainPage() /// <summary> /// 생성자 /// </summary> public MainPage() { InitializeComponent(); Loaded += Page_Loaded; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region 페이지 로드시 처리하기 - Page_Loaded(sender, e) /// <summary> /// 페이지 로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Page_Loaded(object sender, RoutedEventArgs e) { this.textBlockActualHeight = this.textBlock.ActualHeight; CompositionTarget.Rendering += CompositionTarget_Rendering; } #endregion #region 구성 타겟 렌더링시 처리하기 - CompositionTarget_Rendering(sender, e) /// <summary> /// 구성 타겟 렌더링시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void CompositionTarget_Rendering(object sender, object e) { this.textBlock.FontSize = ActualHeight / textBlockActualHeight; RenderingEventArgs renderingEventArgs = e as RenderingEventArgs; double t = (0.25 * renderingEventArgs.RenderingTime.TotalSeconds) % 1; for(int index = 0; index < this.textBlockForegroundBrush.GradientStops.Count; index++) { this.textBlockForegroundBrush.GradientStops[index].Offset = index / 7.0 - t; } } #endregion } } |
