321 lines
9.3 KiB
C#
321 lines
9.3 KiB
C#
using AntdUI;
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using System;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Drawing;
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using System.Drawing.Text;
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using System.Runtime.CompilerServices;
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using System.Windows.Forms;
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namespace JinYuan.ControlLib
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{
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public partial class UCRollText : UserControl
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{
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private Rectangle _textRect; // 文字绘制矩形
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private int _moveDirection = 1; // 移动方向
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private const int MIN_MOVE_PIXELS = 1;
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private const int DEFAULT_MOVE_STEP = 2; // 减小步长，使滚动更平滑
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private const int MIN_INTERVAL = 80; // 最小间隔 16ms ≈ 60fps
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private Timer _timer;
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private long _lastTickTime;
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private bool _isAnimating = false; // 用于标记是否有异步操作正在执行，避免并发问题
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private string _lastText = ""; // 缓存上次文本，避免重复测量
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private Size _textSize; // 缓存文本尺寸
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#region Properties
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public override Font Font
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{
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get => base.Font;
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set
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{
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base.Font = value;
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_textSize = Size.Empty; // 字体改变，需要重新测量
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UpdateTextRect();
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}
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}
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public override string Text
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{
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get => base.Text;
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set
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{
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if (base.Text != value)
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{
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base.Text = value;
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_lastText = value;
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_textSize = Size.Empty; // 文本改变，需要重新测量
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UpdateTextRect();
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if (_isChangeReset) ResetTextPosition();
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}
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}
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}
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private RollStyle _rollStyle = RollStyle.LeftToRight;
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public RollStyle RollStyle
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{
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get => _rollStyle;
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set
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{
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if (_rollStyle != value)
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{
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_rollStyle = value;
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_moveDirection = value == RollStyle.RightToLeft ? -1 : 1;
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ResetTextPosition();
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}
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}
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}
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private bool _isChangeReset = true;
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[Description("文本改变是否重新从边缘运动"), Category("自定义")]
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public bool IsChangeReset
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{
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get => _isChangeReset;
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set => _isChangeReset = value;
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}
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private bool _isExit;
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[Description("是否退出"), Category("自定义")]
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public bool IsExit
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{
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get => _isExit;
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set
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{
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_isExit = value;
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if (value) StopAnimation();
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}
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}
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private int _moveInterval = MIN_INTERVAL;
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[Description("每次滚动间隔时间，越小速度越快"), Category("自定义")]
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public int MoveInterval
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{
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get => _moveInterval;
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set
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{
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_moveInterval = Math.Max(value, MIN_INTERVAL);
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if (_timer != null)
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{
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_timer.Interval = _moveInterval;
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}
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}
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}
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#endregion
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public UCRollText()
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{
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InitializeControl();
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StartAnimation();
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}
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private void InitializeControl()
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{
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// 高性能绘制样式
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SetStyle(ControlStyles.AllPaintingInWmPaint |
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ControlStyles.OptimizedDoubleBuffer |
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ControlStyles.ResizeRedraw |
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ControlStyles.UserPaint |
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ControlStyles.SupportsTransparentBackColor, true);
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DoubleBuffered = true;
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Size = new Size(450, 30);
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Text = "滚动文字";
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ForeColor = Color.FromArgb(255, 77, 59);
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}
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private void StartAnimation()
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{
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if (_isAnimating || _timer != null) return;
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_isAnimating = true;
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_lastTickTime = Stopwatch.GetTimestamp();
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_timer = new Timer();
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_timer.Interval = _moveInterval;
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_timer.Tick += Timer_Tick;
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_timer.Start();
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}
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private void Timer_Tick(object sender, EventArgs e)
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{
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if (!_isAnimating || !Visible || this.IsDisposed) return;
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try
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{
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long now = Stopwatch.GetTimestamp();
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long elapsedMs = (now - _lastTickTime) * 1000 / Stopwatch.Frequency;
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_lastTickTime = now;
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// 根据经过的时间计算平滑步长
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int step = (int)(DEFAULT_MOVE_STEP * (elapsedMs / (float)_moveInterval));
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if (step < 1) step = 1;
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UpdateTextPosition(step);
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//// 调试输出（发布时可注释）
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//Console.WriteLine($"UCRollText Tick elapsed={elapsedMs}ms");
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}
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catch { }
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}
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private void StopAnimation()
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{
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_isAnimating = false;
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if (_timer != null)
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{
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_timer.Stop();
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_timer.Dispose();
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_timer = null;
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}
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}
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private void UpdateTextPosition(int step)
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{
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if (_textRect.IsEmpty) return;
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// 只有在BackAndForth模式下才检查文字宽度
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if (_rollStyle == RollStyle.BackAndForth && _textRect.Width >= Width) return;
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int oldX = _textRect.X;
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// 更新位置
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_textRect.X += step * _moveDirection;
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// 边界处理
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switch (_rollStyle)
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{
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case RollStyle.BackAndForth:
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if (_textRect.X <= 0)
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_moveDirection = 1;
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else if (_textRect.Right >= Width)
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_moveDirection = -1;
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break;
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case RollStyle.LeftToRight:
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if (_textRect.X > Width)
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_textRect.X = -_textRect.Width - 1;
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break;
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case RollStyle.RightToLeft:
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if (_textRect.Right < 0)
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_textRect.X = Width;
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break;
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}
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// 只有位置变化才重绘
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if (Math.Abs(_textRect.X - oldX) >= MIN_MOVE_PIXELS)
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{
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if (IsHandleCreated && !IsDisposed && Visible)
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{
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Invalidate();
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}
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}
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}
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private void UpdateTextRect()
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{
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if (string.IsNullOrEmpty(Text))
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{
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_textRect = Rectangle.Empty;
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return;
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}
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// 只有在文本或字体改变时才重新测量
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if (_textSize.IsEmpty || Text != _lastText)
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{
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_textSize = TextRenderer.MeasureText(Text, Font);
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_lastText = Text;
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}
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_textRect = new Rectangle(
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_isChangeReset ? 0 : _textRect.X,
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(Height - _textSize.Height) / 2,
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_textSize.Width,
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_textSize.Height
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);
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if (IsHandleCreated && Visible)
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Invalidate();
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}
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private void ResetTextPosition()
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{
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if (_textRect.IsEmpty) return;
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switch (_rollStyle)
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{
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case RollStyle.LeftToRight:
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_textRect.X = -_textRect.Width - 1;
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break;
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case RollStyle.RightToLeft:
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_textRect.X = Width;
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break;
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default:
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_textRect.X = 0;
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break;
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}
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if (IsHandleCreated && Visible)
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Invalidate();
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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// 禁用基类绘制，减少绘制层次
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// base.OnPaint(e);
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if (!_textRect.IsEmpty && !string.IsNullOrEmpty(Text) && Visible)
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{
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// 使用TextRenderer的优化方法，指定文本格式
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TextRenderer.DrawText(e.Graphics, Text, Font, _textRect, ForeColor, TextFormatFlags.NoPrefix | TextFormatFlags.SingleLine | TextFormatFlags.NoClipping);
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}
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}
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protected override void OnSizeChanged(EventArgs e)
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{
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base.OnSizeChanged(e);
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if (_textRect != Rectangle.Empty)
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{
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_textRect.Y = (Height - _textRect.Height) / 2;
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Invalidate();
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}
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}
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protected override void OnVisibleChanged(EventArgs e)
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{
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base.OnVisibleChanged(e);
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// 控件不可见时停止动画，节省资源
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if (Visible)
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{
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StartAnimation();
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}
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else
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{
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StopAnimation();
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}
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}
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protected override void OnHandleDestroyed(EventArgs e)
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{
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StopAnimation();
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base.OnHandleDestroyed(e);
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}
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private void InitializeComponent()
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{
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this.SuspendLayout();
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this.Name = "UCRollText";
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this.Size = new Size(450, 30);
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this.ResumeLayout(false);
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}
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}
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public enum RollStyle
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{
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LeftToRight,
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RightToLeft,
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BackAndForth
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}
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} |