sl@0: using System;
sl@0: using System.Collections.Generic;
sl@0: using System.ComponentModel;
sl@0: using System.Diagnostics;
sl@0: using System.Linq;
sl@0: using System.Text;
sl@0: using System.Threading.Tasks;
sl@0: //using System.Timers;
sl@0: using System.Windows.Forms;
sl@0: using System.Drawing;
sl@0: 
sl@0: namespace SharpDisplayManager
sl@0: {
sl@15:     [System.ComponentModel.DesignerCategory("Code")]
sl@17:     public class MarqueeLabel : Label
sl@0:     {
sl@2:         private bool iOwnTimer;
sl@5:         private StringFormat iStringFormat;
sl@5:         private SolidBrush iBrush;
sl@6:         private SizeF iTextSize;
sl@8:         private SizeF iSeparatorSize;
sl@34:         private SizeF iScrollSize;
sl@100:         private Font iFontInUse;
sl@8: 
sl@8:         [Category("Appearance")]
sl@8:         [Description("Separator in our scrolling loop.")]
sl@8:         [DefaultValue(" | ")]
sl@8:         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
sl@11:         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
sl@8:         public string Separator { get; set; }
sl@0: 
sl@0:         [Category("Behavior")]
sl@0:         [Description("How fast is our text scrolling, in pixels per second.")]
sl@0:         [DefaultValue(32)]
sl@0:         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
sl@11:         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
sl@0:         public int PixelsPerSecond { get; set; }
sl@0: 
sl@2:         [Category("Behavior")]
sl@100:         [Description("Should we scale down our font to try fit our text without scrolling.")]
sl@100:         [DefaultValue(false)]
sl@100:         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
sl@100:         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
sl@100:         public bool ScaleToFit { get; set; }
sl@100: 
sl@100:         [Category("Behavior")]
sl@100:         [Description("Minimum size of our font allowed when scaling is enabled.")]
sl@100:         [DefaultValue(15)]
sl@100:         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
sl@100:         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
sl@100:         public float MinFontSize { get; set; }
sl@100: 
sl@100:         [Category("Behavior")]
sl@2:         [Description("Use an internal or an external timer.")]
sl@2:         [DefaultValue(true)]
sl@2:         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
sl@11:         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
sl@2:         public bool OwnTimer
sl@2:         {
sl@2:             get
sl@2:             {
sl@2:                 return iOwnTimer;
sl@2:             }
sl@2:             set
sl@2:             {
sl@2:                 iOwnTimer = value;
sl@2: 
sl@2:                 if (iOwnTimer)
sl@2:                 {
sl@2:                     Timer = new Timer();
sl@2:                     Timer.Interval = 10;
sl@2:                     Timer.Tick += new EventHandler(Timer_Tick);
sl@2:                     Timer.Start();
sl@2:                 }
sl@2:                 else
sl@2:                 {
sl@2:                     if (Timer != null)
sl@2:                         Timer.Dispose();
sl@2:                     Timer = null;
sl@2:                 }
sl@2: 
sl@2:             }
sl@2:         }
sl@5: 
sl@2:         private int CurrentPosition { get; set; }
sl@2:         private Timer Timer { get; set; }
sl@0:         private DateTime LastTickTime { get; set; }
sl@0:         private double PixelsLeft { get; set; }
sl@0:         //DateTime a = new DateTime(2010, 05, 12, 13, 15, 00);
sl@2:         //DateTime b = new DateTime(2010, 05, 12, 13, 45, 00);
sl@2:         //Console.WriteLine(b.Subtract(a).TotalMinutes);
sl@0: 
sl@0:         public MarqueeLabel()
sl@0:         {
sl@0:             UseCompatibleTextRendering = true;
sl@0:             //PixelsPerSecond = 32;
sl@0:             LastTickTime = DateTime.Now;
sl@0:             PixelsLeft = 0;
sl@33:             CurrentPosition = 0;
sl@5:             iBrush = new SolidBrush(ForeColor);
sl@100:             MinFontSize = 15;
sl@100:             ScaleToFit = true;
sl@100:             //Just clone our font
sl@100:             iFontInUse = new Font(Font, Font.Style);
StephaneLenclud@35: 
sl@41:             //Following is needed if we ever switch from Label to Control base class.
StephaneLenclud@35:             //Without it you get some pretty nasty flicker
StephaneLenclud@35:             //SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
StephaneLenclud@35:             //SetStyle(ControlStyles.UserPaint, true);
sl@41:             //SetStyle(ControlStyles.AllPaintingInWmPaint, true);
StephaneLenclud@35:             //SetStyle(ControlStyles.DoubleBuffer, true);
sl@0:         }
sl@0: 
sl@2:         public void UpdateAnimation(DateTime aLastTickTime, DateTime aNewTickTime)
sl@0:         {
sl@6:             if (!NeedToScroll())
sl@0:             {
sl@6:                 CurrentPosition = 0;
sl@6:                 return;
sl@6:             }
sl@6: 
sl@34:             /*
sl@8:             while (CurrentPosition > (iTextSize.Width + iSeparatorSize.Width))
sl@6:             {
sl@8:                 CurrentPosition -= ((int)(iTextSize.Width + iSeparatorSize.Width));
sl@0:             }
sl@34:              */
sl@34: 
sl@34:             while (CurrentPosition > iScrollSize.Width)
sl@34:             {
sl@34:                 CurrentPosition -= (int)iScrollSize.Width;
sl@34:             }
sl@34: 
sl@0: 
sl@2:             PixelsLeft += aNewTickTime.Subtract(aLastTickTime).TotalSeconds * PixelsPerSecond;
sl@0: 
sl@0:             //Keep track of our pixels left over
sl@0:             //PixelsLeft = offset - Math.Truncate(offset);
sl@0:             double offset = Math.Truncate(PixelsLeft);
sl@0:             PixelsLeft -= offset;
sl@0: 
sl@0:             CurrentPosition += Convert.ToInt32(offset);
sl@0: 
sl@0:             /*
sl@0:             if (offset > 1.0)
sl@0:             {
sl@0:                 BackColor = Color.Red;
sl@0:             }
sl@0:             else if (offset==1.0)
sl@0:             {
sl@0:                 if (BackColor != Color.White)
sl@0:                 {
sl@0:                     BackColor = Color.White;
sl@0:                 }
sl@0: 
sl@0:             }
sl@0:             else
sl@0:             {
sl@0:                 //Too slow
sl@0:                 //BackColor = Color.Green;
sl@0:             }*/
sl@0: 
sl@0:             //Only redraw if something has changed
sl@0:             if (offset != 0)
sl@0:             {
sl@0:                 Invalidate();
sl@0:             }
sl@2:         }
sl@0: 
sl@2:         void Timer_Tick(object sender, EventArgs e)
sl@2:         {
sl@5:             DateTime NewTickTime = DateTime.Now;
sl@2:             //
sl@2:             UpdateAnimation(LastTickTime, NewTickTime);
sl@2:             //
sl@2:             LastTickTime = NewTickTime;
sl@0:         }
sl@0: 
sl@5:         private StringFormat GetStringFormatFromContentAllignment(ContentAlignment ca)
sl@5:         {
sl@41:             StringFormat format = new StringFormat(StringFormat.GenericTypographic);
sl@5:             switch (ca)
sl@5:             {
sl@5:                 case ContentAlignment.TopCenter:
sl@34:                     format.Alignment = StringAlignment.Center;
sl@34:                     format.LineAlignment = StringAlignment.Near;
sl@5:                     break;
sl@5:                 case ContentAlignment.TopLeft:
sl@5:                     format.Alignment = StringAlignment.Near;
sl@5:                     format.LineAlignment = StringAlignment.Near;
sl@5:                     break;
sl@5:                 case ContentAlignment.TopRight:
sl@34:                     format.Alignment = StringAlignment.Far;
sl@34:                     format.LineAlignment = StringAlignment.Near;
sl@5:                     break;
sl@5:                 case ContentAlignment.MiddleCenter:
sl@5:                     format.Alignment = StringAlignment.Center;
sl@5:                     format.LineAlignment = StringAlignment.Center;
sl@5:                     break;
sl@5:                 case ContentAlignment.MiddleLeft:
sl@34:                     format.Alignment = StringAlignment.Near;
sl@34:                     format.LineAlignment = StringAlignment.Center;
sl@5:                     break;
sl@5:                 case ContentAlignment.MiddleRight:
sl@34:                     format.Alignment = StringAlignment.Far;
sl@34:                     format.LineAlignment = StringAlignment.Center;
sl@34:                     break;
sl@34:                 case ContentAlignment.BottomCenter:
sl@5:                     format.Alignment = StringAlignment.Center;
sl@5:                     format.LineAlignment = StringAlignment.Far;
sl@5:                     break;
sl@5:                 case ContentAlignment.BottomLeft:
sl@34:                     format.Alignment = StringAlignment.Near;
sl@34:                     format.LineAlignment = StringAlignment.Far;
sl@5:                     break;
sl@5:                 case ContentAlignment.BottomRight:
sl@5:                     format.Alignment = StringAlignment.Far;
sl@5:                     format.LineAlignment = StringAlignment.Far;
sl@5:                     break;
sl@5:             }
sl@5: 
sl@5:             format.FormatFlags |= StringFormatFlags.NoWrap;
sl@5:             format.FormatFlags |= StringFormatFlags.NoClip;
sl@11:             format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;
sl@5:             format.Trimming = StringTrimming.None;
sl@5: 
sl@5:             return format;
sl@5:         }
sl@5: 
sl@5:         protected override void OnForeColorChanged(EventArgs e)
sl@5:         {
sl@6:             //Color has changed recreate our brush
sl@5:             iBrush = new SolidBrush(ForeColor);
sl@5: 
sl@5:             base.OnForeColorChanged(e);
sl@5:         }
sl@5: 
sl@6: 
sl@100:         private void ComputeSizes()
sl@6:         {
sl@11:             //For all string measurements and drawing issues refer to the following article:
sl@11:             // http://stackoverflow.com/questions/1203087/why-is-graphics-measurestring-returning-a-higher-than-expected-number
sl@6:             //Update text size according to text and font
sl@6:             Graphics g = this.CreateGraphics();
sl@6:             g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
sl@6:             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);
sl@100:             iTextSize = g.MeasureString(Text, iFontInUse, Int32.MaxValue, iStringFormat);
sl@100:             iSeparatorSize = g.MeasureString(Separator, iFontInUse, Int32.MaxValue, iStringFormat);
sl@34:             //Scroll width is the width of our text and our separator without taking kerning into account since
sl@34:             //both text and separator are drawn independently from each other.
sl@34:             iScrollSize.Width = iSeparatorSize.Width + iTextSize.Width;
sl@34:             iScrollSize.Height = Math.Max(iSeparatorSize.Height, iTextSize.Height); //Not relevant for now
sl@100:             //We don't want scroll width to take kerning into account so we don't use the following
sl@34:             //iScrollSize = g.MeasureString(Text + Separator, Font, Int32.MaxValue, iStringFormat);
sl@100:         }
sl@100: 
sl@100:         private void HandleTextSizeChange()
sl@100:         {
sl@100:             ComputeSizes();
sl@6: 
sl@6:             if (NeedToScroll())
sl@6:             {
sl@100:                 if (ScaleToFit && iFontInUse.SizeInPoints > MinFontSize)
sl@100:                 {
sl@100:                     //Try scaling down
sl@100:                     iFontInUse = new Font(Font.FontFamily, iFontInUse.SizeInPoints - 1, Font.Style);
sl@100:                     //Recurse until we are done
sl@100:                     HandleTextSizeChange();
sl@100:                 }
sl@100:                 else
sl@100:                 {
sl@100:                     if (ScaleToFit)
sl@100:                     {
sl@100:                         //Our minimum font size still needs scrolling
sl@100:                         //Reset our font then
sl@100:                         iFontInUse = new Font(Font,Font.Style);
sl@100:                         ComputeSizes();
sl@100:                     }
sl@100: 
sl@100:                     //Scrolling is ok or needed
sl@100:                     //Always align left when scrolling
sl@100:                     iStringFormat.Alignment = StringAlignment.Near;
sl@100:                 }
sl@41:             }
sl@42: 
sl@100:             //Reset our timer whenever our text changes
sl@100:             CurrentPosition = 0;
sl@100:             PixelsLeft = 0;
sl@100:             LastTickTime = DateTime.Now;
sl@6:         }
sl@6: 
sl@6:         protected override void OnTextChanged(EventArgs e)
sl@6:         {
sl@100:             //Just clone our font
sl@100:             iFontInUse = new Font(Font, Font.Style);
sl@100: 
sl@6:             HandleTextSizeChange();
sl@6: 
sl@6:             base.OnTextChanged(e);
sl@6:         }
sl@6: 
sl@6:         protected override void OnFontChanged(EventArgs e)
sl@6:         {
sl@100:             //Just clone our font
sl@100:             iFontInUse = new Font(Font,Font.Style);
sl@100: 
sl@6:             HandleTextSizeChange();
sl@6: 
sl@6:             base.OnFontChanged(e);
sl@6:         }
sl@6: 
sl@100:         protected override void OnSizeChanged(EventArgs e)
sl@100:         {
sl@100:             //Just clone our font
sl@100:             iFontInUse = new Font(Font, Font.Style);
sl@100: 
sl@100:             HandleTextSizeChange();
sl@100: 
sl@100:             base.OnSizeChanged(e);
sl@100:         }
sl@100: 
sl@5:         protected override void OnTextAlignChanged(EventArgs e)
sl@5:         {
sl@42:             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);
sl@41:             if (NeedToScroll())
sl@41:             {
sl@41:                 //Always align left when scrolling to avoid bugs
sl@42:                 iStringFormat.Alignment = StringAlignment.Near;
sl@41:             }
sl@42: 
sl@41:             Invalidate();
sl@41:             //
sl@5:             base.OnTextAlignChanged(e);
sl@5:         }
sl@5: 
sl@0:         protected override void OnPaint(PaintEventArgs e)
sl@0:         {
sl@0:             //Disable anti-aliasing
sl@0:             e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;
sl@6:             if (NeedToScroll())
sl@6:             {
sl@34:                 //Draw it all in a single call would take kerning into account
sl@34:                 //e.Graphics.TranslateTransform(-(float)CurrentPosition, 0);
sl@41:                 //e.Graphics.DrawString(Text + Separator + Text, Font, iBrush, ClientRectangle, StringFormat);
sl@34: 
sl@34:                 //Doing separate draw operation allows us not to take kerning into account between separator and string
sl@34:                 //Draw the first one
sl@33:                 e.Graphics.TranslateTransform(-(float)CurrentPosition, 0);
sl@100:                 e.Graphics.DrawString(Text, iFontInUse, iBrush, ClientRectangle, iStringFormat);
sl@8:                 //Draw separator
sl@34:                 e.Graphics.TranslateTransform(iTextSize.Width, 0);
sl@100:                 e.Graphics.DrawString(Separator, iFontInUse, iBrush, ClientRectangle, iStringFormat);
sl@6:                 //Draw the last one
sl@34:                 e.Graphics.TranslateTransform(iSeparatorSize.Width, 0);
sl@100:                 e.Graphics.DrawString(Text, iFontInUse, iBrush, ClientRectangle, iStringFormat);
sl@6:             }
sl@6:             else
sl@6:             {
sl@100:                 e.Graphics.DrawString(Text, iFontInUse, iBrush, ClientRectangle, iStringFormat);
sl@6:             }
sl@6: 
sl@6: 
sl@5: 
sl@5:             //DrawText is not working without anti-aliasing. See: stackoverflow.com/questions/8283631/graphics-drawstring-vs-textrenderer-drawtextwhich-can-deliver-better-quality
sl@5:             //TextRenderer.DrawText(e.Graphics, Text, Font, ClientRectangle, ForeColor, BackColor, iTextFormatFlags);
sl@5: 
sl@5:             //base.OnPaint(e);
sl@0:         }
sl@0: 
sl@6:         public bool NeedToScroll()
sl@6:         {
sl@6:             //if (Width < e.Graphics.MeasureString(Text, Font).Width)
sl@6:             if (Width < iTextSize.Width)
sl@6:             {
sl@6:                 return true;
sl@6:             }
sl@6:             return false;
sl@6:         }
sl@6: 
sl@0:         protected override void Dispose(bool disposing)
sl@0:         {
sl@0:             if (disposing)
sl@0:             {
sl@0:                 if (Timer != null)
sl@0:                     Timer.Dispose();
sl@0:             }
sl@0:             Timer = null;
sl@0:         }
sl@0:     }
sl@0: }