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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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//using System.Timers;
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using System.Windows.Forms;
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using System.Drawing;
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namespace SharpDisplayManager
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{
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sl@15
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[System.ComponentModel.DesignerCategory("Code")]
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public class MarqueeLabel : Label
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{
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private bool iOwnTimer;
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private StringFormat iStringFormat;
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private SolidBrush iBrush;
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private SizeF iTextSize;
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private SizeF iSeparatorSize;
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private SizeF iScrollSize;
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[Category("Appearance")]
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[Description("Separator in our scrolling loop.")]
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[DefaultValue(" | ")]
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[Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
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public string Separator { get; set; }
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[Category("Behavior")]
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[Description("How fast is our text scrolling, in pixels per second.")]
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[DefaultValue(32)]
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[Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
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public int PixelsPerSecond { get; set; }
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[Category("Behavior")]
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[Description("Use an internal or an external timer.")]
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[DefaultValue(true)]
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[Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
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sl@11
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[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
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sl@2
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public bool OwnTimer
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{
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get
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{
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return iOwnTimer;
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sl@2
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}
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sl@2
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set
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{
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iOwnTimer = value;
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sl@2
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if (iOwnTimer)
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{
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Timer = new Timer();
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Timer.Interval = 10;
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Timer.Tick += new EventHandler(Timer_Tick);
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Timer.Start();
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}
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else
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{
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if (Timer != null)
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Timer.Dispose();
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Timer = null;
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}
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sl@2
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}
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}
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private int CurrentPosition { get; set; }
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private Timer Timer { get; set; }
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private DateTime LastTickTime { get; set; }
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private double PixelsLeft { get; set; }
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//DateTime a = new DateTime(2010, 05, 12, 13, 15, 00);
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//DateTime b = new DateTime(2010, 05, 12, 13, 45, 00);
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//Console.WriteLine(b.Subtract(a).TotalMinutes);
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public MarqueeLabel()
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{
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UseCompatibleTextRendering = true;
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//PixelsPerSecond = 32;
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LastTickTime = DateTime.Now;
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PixelsLeft = 0;
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CurrentPosition = 0;
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iBrush = new SolidBrush(ForeColor);
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//Following is needed if we ever switch from Label to Control base class.
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//Without it you get some pretty nasty flicker
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//SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
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//SetStyle(ControlStyles.UserPaint, true);
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//SetStyle(ControlStyles.AllPaintingInWmPaint, true);
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//SetStyle(ControlStyles.DoubleBuffer, true);
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}
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public void UpdateAnimation(DateTime aLastTickTime, DateTime aNewTickTime)
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{
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if (!NeedToScroll())
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{
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CurrentPosition = 0;
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return;
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}
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/*
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while (CurrentPosition > (iTextSize.Width + iSeparatorSize.Width))
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{
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CurrentPosition -= ((int)(iTextSize.Width + iSeparatorSize.Width));
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}
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*/
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while (CurrentPosition > iScrollSize.Width)
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{
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CurrentPosition -= (int)iScrollSize.Width;
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}
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PixelsLeft += aNewTickTime.Subtract(aLastTickTime).TotalSeconds * PixelsPerSecond;
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//Keep track of our pixels left over
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//PixelsLeft = offset - Math.Truncate(offset);
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double offset = Math.Truncate(PixelsLeft);
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PixelsLeft -= offset;
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CurrentPosition += Convert.ToInt32(offset);
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/*
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if (offset > 1.0)
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{
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BackColor = Color.Red;
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}
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else if (offset==1.0)
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{
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if (BackColor != Color.White)
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{
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BackColor = Color.White;
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}
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}
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else
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{
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//Too slow
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//BackColor = Color.Green;
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}*/
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//Only redraw if something has changed
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if (offset != 0)
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{
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Invalidate();
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}
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}
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void Timer_Tick(object sender, EventArgs e)
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{
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DateTime NewTickTime = DateTime.Now;
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//
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UpdateAnimation(LastTickTime, NewTickTime);
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//
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LastTickTime = NewTickTime;
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}
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sl@0
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private StringFormat GetStringFormatFromContentAllignment(ContentAlignment ca)
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{
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StringFormat format = new StringFormat(StringFormat.GenericTypographic);
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switch (ca)
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{
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case ContentAlignment.TopCenter:
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format.Alignment = StringAlignment.Center;
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format.LineAlignment = StringAlignment.Near;
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break;
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case ContentAlignment.TopLeft:
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format.Alignment = StringAlignment.Near;
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format.LineAlignment = StringAlignment.Near;
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break;
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case ContentAlignment.TopRight:
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format.Alignment = StringAlignment.Far;
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format.LineAlignment = StringAlignment.Near;
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break;
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sl@5
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case ContentAlignment.MiddleCenter:
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format.Alignment = StringAlignment.Center;
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format.LineAlignment = StringAlignment.Center;
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break;
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case ContentAlignment.MiddleLeft:
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format.Alignment = StringAlignment.Near;
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format.LineAlignment = StringAlignment.Center;
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break;
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case ContentAlignment.MiddleRight:
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format.Alignment = StringAlignment.Far;
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format.LineAlignment = StringAlignment.Center;
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break;
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sl@34
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case ContentAlignment.BottomCenter:
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format.Alignment = StringAlignment.Center;
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format.LineAlignment = StringAlignment.Far;
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break;
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case ContentAlignment.BottomLeft:
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format.Alignment = StringAlignment.Near;
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format.LineAlignment = StringAlignment.Far;
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break;
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case ContentAlignment.BottomRight:
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format.Alignment = StringAlignment.Far;
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format.LineAlignment = StringAlignment.Far;
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break;
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sl@5
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}
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sl@5
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format.FormatFlags |= StringFormatFlags.NoWrap;
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format.FormatFlags |= StringFormatFlags.NoClip;
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format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
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format.Trimming = StringTrimming.None;
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return format;
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}
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protected override void OnForeColorChanged(EventArgs e)
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{
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//Color has changed recreate our brush
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iBrush = new SolidBrush(ForeColor);
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base.OnForeColorChanged(e);
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}
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sl@5
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private void HandleTextSizeChange()
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{
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//Reset our timer whenever our text changes
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CurrentPosition = 0;
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LastTickTime = DateTime.Now;
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PixelsLeft = 0;
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sl@11
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//For all string measurements and drawing issues refer to the following article:
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// http://stackoverflow.com/questions/1203087/why-is-graphics-measurestring-returning-a-higher-than-expected-number
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//Update text size according to text and font
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Graphics g = this.CreateGraphics();
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g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
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iStringFormat = GetStringFormatFromContentAllignment(TextAlign);
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iTextSize = g.MeasureString(Text, Font, Int32.MaxValue, iStringFormat);
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iSeparatorSize = g.MeasureString(Separator, Font, Int32.MaxValue, iStringFormat);
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//Scroll width is the width of our text and our separator without taking kerning into account since
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//both text and separator are drawn independently from each other.
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iScrollSize.Width = iSeparatorSize.Width + iTextSize.Width;
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iScrollSize.Height = Math.Max(iSeparatorSize.Height, iTextSize.Height); //Not relevant for now
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//We don't want scroll with to take kerning into account so we don't use the following
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//iScrollSize = g.MeasureString(Text + Separator, Font, Int32.MaxValue, iStringFormat);
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if (NeedToScroll())
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{
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//Always align left when scrolling
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iStringFormat.Alignment = StringAlignment.Near;
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}
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sl@6
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}
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sl@6
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sl@6
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protected override void OnTextChanged(EventArgs e)
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{
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HandleTextSizeChange();
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base.OnTextChanged(e);
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}
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sl@6
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protected override void OnFontChanged(EventArgs e)
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{
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HandleTextSizeChange();
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base.OnFontChanged(e);
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}
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sl@6
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protected override void OnTextAlignChanged(EventArgs e)
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{
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iStringFormat = GetStringFormatFromContentAllignment(TextAlign);
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if (NeedToScroll())
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{
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//Always align left when scrolling to avoid bugs
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iStringFormat.Alignment = StringAlignment.Near;
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}
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sl@42
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Invalidate();
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//
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base.OnTextAlignChanged(e);
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}
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protected override void OnPaint(PaintEventArgs e)
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{
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//Disable anti-aliasing
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e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
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if (NeedToScroll())
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{
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//Draw it all in a single call would take kerning into account
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//e.Graphics.TranslateTransform(-(float)CurrentPosition, 0);
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sl@41
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//e.Graphics.DrawString(Text + Separator + Text, Font, iBrush, ClientRectangle, StringFormat);
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sl@34
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sl@34
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//Doing separate draw operation allows us not to take kerning into account between separator and string
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sl@34
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//Draw the first one
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e.Graphics.TranslateTransform(-(float)CurrentPosition, 0);
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sl@34
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e.Graphics.DrawString(Text, Font, iBrush, ClientRectangle, iStringFormat);
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sl@8
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//Draw separator
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e.Graphics.TranslateTransform(iTextSize.Width, 0);
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sl@34
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e.Graphics.DrawString(Separator, Font, iBrush, ClientRectangle, iStringFormat);
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sl@6
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//Draw the last one
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sl@34
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e.Graphics.TranslateTransform(iSeparatorSize.Width, 0);
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sl@34
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e.Graphics.DrawString(Text, Font, iBrush, ClientRectangle, iStringFormat);
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sl@6
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}
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sl@6
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else
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sl@6
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{
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sl@6
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e.Graphics.DrawString(Text, Font, iBrush, ClientRectangle, iStringFormat);
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sl@6
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}
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sl@6
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sl@6
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sl@5
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sl@5
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//DrawText is not working without anti-aliasing. See: stackoverflow.com/questions/8283631/graphics-drawstring-vs-textrenderer-drawtextwhich-can-deliver-better-quality
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sl@5
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//TextRenderer.DrawText(e.Graphics, Text, Font, ClientRectangle, ForeColor, BackColor, iTextFormatFlags);
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sl@5
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sl@5
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//base.OnPaint(e);
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sl@0
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}
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sl@0
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sl@6
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public bool NeedToScroll()
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sl@6
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{
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sl@6
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//if (Width < e.Graphics.MeasureString(Text, Font).Width)
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sl@6
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if (Width < iTextSize.Width)
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sl@6
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{
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sl@6
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return true;
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sl@6
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}
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sl@6
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return false;
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sl@6
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}
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sl@6
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sl@0
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protected override void Dispose(bool disposing)
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sl@0
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{
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sl@0
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if (disposing)
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sl@0
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{
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sl@0
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if (Timer != null)
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sl@0
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Timer.Dispose();
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sl@0
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}
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sl@0
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Timer = null;
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sl@0
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}
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sl@0
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}
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sl@0
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}
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