AlarmScrollingText.cs

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+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Threading;
+
+namespace PLCDataMonitor
+{
+    /// <summary>
+    /// 自定义滚动报警控件（跑马灯效果 + 闪烁）
+    /// </summary>
+    public class AlarmScrollingText : ContentControl
+    {
+        private TextBlock _textBlock;
+        private Border _clipBorder;
+        private Storyboard _scrollStoryboard;
+        private Storyboard _blinkStoryboard;
+        private double _currentOffset = 0;
+        private DispatcherTimer _resetTimer;
+
+        public static readonly DependencyProperty TextProperty =
+            DependencyProperty.Register("Text", typeof(string), typeof(AlarmScrollingText),
+                new FrameworkPropertyMetadata(string.Empty, OnTextChanged));
+
+        public string Text
+        {
+            get { return (string)GetValue(TextProperty); }
+            set { SetValue(TextProperty, value); }
+        }
+
+        private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+        {
+            var control = d as AlarmScrollingText;
+            string newText = e.NewValue as string ?? string.Empty;
+            control?.OnTextChanged(newText);
+        }
+
+        public AlarmScrollingText()
+        {
+            // 默认样式
+            DefaultStyleKey = typeof(AlarmScrollingText);
+        }
+
+        public override void OnApplyTemplate()
+        {
+            base.OnApplyTemplate();
+            _textBlock = GetTemplateChild("PART_TextBlock") as TextBlock;
+            _clipBorder = GetTemplateChild("PART_ClipBorder") as Border;
+
+            if (_textBlock != null && _clipBorder != null)
+            {
+                _textBlock.Loaded += OnTextBlockLoaded;
+                _textBlock.SizeChanged += OnTextBlockSizeChanged;
+                InitializeAnimations();
+            }
+        }
+
+        private void OnTextBlockLoaded(object sender, RoutedEventArgs e)
+        {
+            StartScrollingIfNeeded();
+        }
+
+        private void OnTextBlockSizeChanged(object sender, SizeChangedEventArgs e)
+        {
+            StartScrollingIfNeeded();
+        }
+
+        private void OnTextChanged(string newText)
+        {
+            if (_textBlock != null)
+            {
+                _textBlock.Text = newText;
+                StartScrollingIfNeeded();
+                StartBlinking(newText);
+            }
+        }
+
+        private void InitializeAnimations()
+        {
+            // 滚动动画
+            _scrollStoryboard = new Storyboard();
+            var doubleAnimation = new DoubleAnimation
+            {
+                From = 0,
+                To = -500, // 临时值，后面动态计算
+                Duration = TimeSpan.FromSeconds(8),
+                RepeatBehavior = RepeatBehavior.Forever
+            };
+            Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.X)"));
+            _scrollStoryboard.Children.Add(doubleAnimation);
+
+            // 闪烁动画（前景色交替变化）
+            _blinkStoryboard = new Storyboard { RepeatBehavior = RepeatBehavior.Forever };
+            var colorAnimation = new ColorAnimation
+            {
+                From = Colors.Red,
+                To = Colors.Orange,
+                Duration = TimeSpan.FromSeconds(0.5),
+                AutoReverse = true,
+                RepeatBehavior = RepeatBehavior.Forever
+            };
+            Storyboard.SetTargetProperty(colorAnimation, new PropertyPath("Foreground.Color"));
+            _blinkStoryboard.Children.Add(colorAnimation);
+        }
+
+        private void StartScrollingIfNeeded()
+        {
+            if (_textBlock == null || _clipBorder == null) return;
+
+            // 停止当前动画
+            _scrollStoryboard?.Stop(_textBlock);
+            _textBlock.RenderTransform = new TranslateTransform();
+
+            // 如果没有报警或报警文本为空，不启动滚动
+            if (string.IsNullOrWhiteSpace(Text) || Text == "无报警")
+                return;
+
+            // 等待布局完成后获取实际宽度
+            Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(() =>
+            {
+                double textWidth = _textBlock.ActualWidth;
+                double containerWidth = _clipBorder.ActualWidth;
+
+                if (textWidth <= containerWidth)
+                {
+                    // 文本不够长，不需要滚动，但保持静止
+                    return;
+                }
+
+                // 重新设置动画的目标偏移量
+                double targetOffset = containerWidth - textWidth;
+                var animation = _scrollStoryboard.Children[0] as DoubleAnimation;
+                if (animation != null)
+                {
+                    animation.From = 0;
+                    animation.To = targetOffset;
+                    animation.Duration = TimeSpan.FromSeconds(Math.Max(4, textWidth / 50.0)); // 速度自适应
+                }
+
+                _textBlock.RenderTransform = new TranslateTransform();
+                _scrollStoryboard.Begin(_textBlock, true);
+            }));
+        }
+
+        private void StartBlinking(string alarmText)
+        {
+            if (_textBlock == null) return;
+
+            // 停止当前闪烁
+            _blinkStoryboard?.Stop(_textBlock);
+
+            // 如果是无效报警或无报警，恢复正常颜色并停止闪烁
+            if (string.IsNullOrWhiteSpace(alarmText) || alarmText == "无报警")
+            {
+                _textBlock.Foreground = SystemColors.ControlTextBrush;
+                return;
+            }
+
+            // 开始闪烁动画
+            _blinkStoryboard.Begin(_textBlock, true);
+        }
+    }
+}