58 lines
2.4 KiB
C#
58 lines
2.4 KiB
C#
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namespace PCL.Core.Utils.Exts;
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using System;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Media;
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/// <summary>
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/// 提供 WPF UI 控件的扩展方法。
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/// </summary>
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public static class UiExtension {
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/// <summary>
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/// 检查控件是否在指定窗口的可视区域内，且控件本身可见。
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/// </summary>
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/// <param name="element">要检查的 FrameworkElement。</param>
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/// <param name="mainWindow">主窗口，用于确定可视区域。</param>
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/// <returns>如果控件部分或完全在窗口可视区域内且可见，则返回 true；否则返回 false。</returns>
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/// <exception cref="ArgumentNullException">当 <paramref name="element"/> 或 <paramref name="mainWindow"/> 为 null 时抛出。</exception>
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public static bool IsVisibleInWindow(this FrameworkElement element, Window mainWindow) {
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if (!element.IsVisible) return false;
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try {
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var transform = element.TransformToAncestor(mainWindow);
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var bounds = transform.TransformBounds(new Rect(0, 0, element.ActualWidth, element.ActualHeight));
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var windowRect = new Rect(0, 0, mainWindow.ActualWidth, mainWindow.ActualHeight);
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return windowRect.IntersectsWith(bounds);
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} catch (InvalidOperationException) {
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return false;
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}
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}
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/// <summary>
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/// 检查 TextBlock 是否因 TextTrimming 属性导致文本被截断。
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/// </summary>
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/// <param name="textBlock">要检查的 TextBlock。</param>
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/// <returns>如果文本被截断，则返回 true；否则返回 false。</returns>
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/// <exception cref="ArgumentNullException">当 <paramref name="textBlock"/> 为 null 时抛出。</exception>
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public static bool IsTextTrimmed(this TextBlock textBlock) {
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if (textBlock.TextTrimming == TextTrimming.None) return false;
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try {
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var formattedText = new FormattedText(
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textBlock.Text,
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System.Globalization.CultureInfo.CurrentCulture,
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textBlock.FlowDirection,
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new Typeface(textBlock.FontFamily, textBlock.FontStyle, textBlock.FontWeight, textBlock.FontStretch),
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textBlock.FontSize,
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textBlock.Foreground,
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VisualTreeHelper.GetDpi(textBlock).PixelsPerDip
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);
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return formattedText.Width > textBlock.ActualWidth;
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} catch (Exception) {
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return false;
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}
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}
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}
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