SharpDisplayManager: Server/MarqueeLabel.cs@31e63bd07dfa

     1 using System;

     2 using System.Collections.Generic;

     3 using System.ComponentModel;

     4 using System.Diagnostics;

     5 using System.Linq;

     6 using System.Text;

     7 using System.Threading.Tasks;

     8 //using System.Timers;

     9 using System.Windows.Forms;

    10 using System.Drawing;

    12 namespace SharpDisplayManager

    13 {

    14     [System.ComponentModel.DesignerCategory("Code")]

    15     public class MarqueeLabel : Label

    16     {

    17         private bool iOwnTimer;

    18         private StringFormat iStringFormat;

    19         private SolidBrush iBrush;

    20         private SizeF iTextSize;

    21         private SizeF iSeparatorSize;

    22         private SizeF iScrollSize;

    23         private Font iFontInUse;

    24 		private string iSeparator;

    26         [Category("Appearance")]

    27         [Description("Separator in our scrolling loop.")]

    28         [DefaultValue(" | ")]

    29         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]

    30         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    31         public string Separator

    32 		{

    33 			get

    34 			{

    35 				return iSeparator;

    36 			}

    37 			set

    38 			{

    39 				if (value != Separator)

    40 				{

    41 					iSeparator = value;

    42 					OnTextChanged(EventArgs.Empty);

    43 				}

    44 			}

    45 		}

    47         [Category("Behavior")]

    48         [Description("How fast is our text scrolling, in pixels per second.")]

    49         [DefaultValue(32)]

    50         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]

    51         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    52         public int PixelsPerSecond { get; set; }

    54         [Category("Behavior")]

    55         [Description("Should we scale down our font to try fit our text without scrolling.")]

    56         [DefaultValue(false)]

    57         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]

    58         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    59         public bool ScaleToFit { get; set; }

    61         [Category("Behavior")]

    62         [Description("Minimum size of our font allowed when scaling is enabled.")]

    63         [DefaultValue(15)]

    64         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]

    65         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    66         public float MinFontSize { get; set; }

    68         [Category("Behavior")]

    69         [Description("Use an internal or an external timer.")]

    70         [DefaultValue(true)]

    71         [Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]

    72         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    73         public bool OwnTimer

    74         {

    75             get

    76             {

    77                 return iOwnTimer;

    78             }

    79             set

    80             {

    81                 iOwnTimer = value;

    83                 if (iOwnTimer)

    84                 {

    85                     Timer = new Timer();

    86                     Timer.Interval = 10;

    87                     Timer.Tick += new EventHandler(Timer_Tick);

    88                     Timer.Start();

    89                 }

    90                 else

    91                 {

    92                     if (Timer != null)

    93                         Timer.Dispose();

    94                     Timer = null;

    95                 }

    97             }

    98         }

   100         private int CurrentPosition { get; set; }

   101         private Timer Timer { get; set; }

   102         private DateTime LastTickTime { get; set; }

   103         private double PixelsLeft { get; set; }

   104         //DateTime a = new DateTime(2010, 05, 12, 13, 15, 00);

   105         //DateTime b = new DateTime(2010, 05, 12, 13, 45, 00);

   106         //Console.WriteLine(b.Subtract(a).TotalMinutes);

   108         public MarqueeLabel()

   109         {

   110             UseCompatibleTextRendering = true;

   111             //PixelsPerSecond = 32;

   112             LastTickTime = DateTime.Now;

   113             PixelsLeft = 0;

   114             CurrentPosition = 0;

   115             iBrush = new SolidBrush(ForeColor);

   116             MinFontSize = 15;

   117             ScaleToFit = true;

   118             //Just clone our font

   119             iFontInUse = new Font(Font, Font.Style);

   121             //Following is needed if we ever switch from Label to Control base class.

   122             //Without it you get some pretty nasty flicker

   123             //SetStyle(ControlStyles.OptimizedDoubleBuffer, true);

   124             //SetStyle(ControlStyles.UserPaint, true);

   125             //SetStyle(ControlStyles.AllPaintingInWmPaint, true);

   126             //SetStyle(ControlStyles.DoubleBuffer, true);

   127         }

   129         public void UpdateAnimation(DateTime aLastTickTime, DateTime aNewTickTime)

   130         {

   131             if (!NeedToScroll())

   132             {

   133                 CurrentPosition = 0;

   134                 return;

   135             }

   137             /*

   138             while (CurrentPosition > (iTextSize.Width + iSeparatorSize.Width))

   139             {

   140                 CurrentPosition -= ((int)(iTextSize.Width + iSeparatorSize.Width));

   141             }

   142              */

   144             while (CurrentPosition > iScrollSize.Width)

   145             {

   146                 CurrentPosition -= (int)iScrollSize.Width;

   147             }

   150             PixelsLeft += aNewTickTime.Subtract(aLastTickTime).TotalSeconds * PixelsPerSecond;

   152             //Keep track of our pixels left over

   153             //PixelsLeft = offset - Math.Truncate(offset);

   154             double offset = Math.Truncate(PixelsLeft);

   155             PixelsLeft -= offset;

   157             CurrentPosition += Convert.ToInt32(offset);

   159             /*

   160             if (offset > 1.0)

   161             {

   162                 BackColor = Color.Red;

   163             }

   164             else if (offset==1.0)

   165             {

   166                 if (BackColor != Color.White)

   167                 {

   168                     BackColor = Color.White;

   169                 }

   171             }

   172             else

   173             {

   174                 //Too slow

   175                 //BackColor = Color.Green;

   176             }*/

   178             //Only redraw if something has changed

   179             if (offset != 0)

   180             {

   181                 Invalidate();

   182             }

   183         }

   185         void Timer_Tick(object sender, EventArgs e)

   186         {

   187             DateTime NewTickTime = DateTime.Now;

   188             //

   189             UpdateAnimation(LastTickTime, NewTickTime);

   190             //

   191             LastTickTime = NewTickTime;

   192         }

   194         private StringFormat GetStringFormatFromContentAllignment(ContentAlignment ca)

   195         {

   196             StringFormat format = new StringFormat(StringFormat.GenericTypographic);

   197             switch (ca)

   198             {

   199                 case ContentAlignment.TopCenter:

   200                     format.Alignment = StringAlignment.Center;

   201                     format.LineAlignment = StringAlignment.Near;

   202                     break;

   203                 case ContentAlignment.TopLeft:

   204                     format.Alignment = StringAlignment.Near;

   205                     format.LineAlignment = StringAlignment.Near;

   206                     break;

   207                 case ContentAlignment.TopRight:

   208                     format.Alignment = StringAlignment.Far;

   209                     format.LineAlignment = StringAlignment.Near;

   210                     break;

   211                 case ContentAlignment.MiddleCenter:

   212                     format.Alignment = StringAlignment.Center;

   213                     format.LineAlignment = StringAlignment.Center;

   214                     break;

   215                 case ContentAlignment.MiddleLeft:

   216                     format.Alignment = StringAlignment.Near;

   217                     format.LineAlignment = StringAlignment.Center;

   218                     break;

   219                 case ContentAlignment.MiddleRight:

   220                     format.Alignment = StringAlignment.Far;

   221                     format.LineAlignment = StringAlignment.Center;

   222                     break;

   223                 case ContentAlignment.BottomCenter:

   224                     format.Alignment = StringAlignment.Center;

   225                     format.LineAlignment = StringAlignment.Far;

   226                     break;

   227                 case ContentAlignment.BottomLeft:

   228                     format.Alignment = StringAlignment.Near;

   229                     format.LineAlignment = StringAlignment.Far;

   230                     break;

   231                 case ContentAlignment.BottomRight:

   232                     format.Alignment = StringAlignment.Far;

   233                     format.LineAlignment = StringAlignment.Far;

   234                     break;

   235             }

   237             format.FormatFlags |= StringFormatFlags.NoWrap;

   238             format.FormatFlags |= StringFormatFlags.NoClip;

   239             format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;

   240             format.Trimming = StringTrimming.None;

   242             return format;

   243         }

   245         protected override void OnForeColorChanged(EventArgs e)

   246         {

   247             //Color has changed recreate our brush

   248             iBrush = new SolidBrush(ForeColor);

   250             base.OnForeColorChanged(e);

   251         }

   254         private void ComputeSizes()

   255         {

   256             //For all string measurements and drawing issues refer to the following article:

   257             // http://stackoverflow.com/questions/1203087/why-is-graphics-measurestring-returning-a-higher-than-expected-number

   258             //Update text size according to text and font

   259             Graphics g = this.CreateGraphics();

   260             g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;

   261             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

   262             iTextSize = g.MeasureString(Text, iFontInUse, Int32.MaxValue, iStringFormat);

   263             iSeparatorSize = g.MeasureString(Separator, iFontInUse, Int32.MaxValue, iStringFormat);

   264             //Scroll width is the width of our text and our separator without taking kerning into account since

   265             //both text and separator are drawn independently from each other.

   266             iScrollSize.Width = iSeparatorSize.Width + iTextSize.Width;

   267             iScrollSize.Height = Math.Max(iSeparatorSize.Height, iTextSize.Height); //Not relevant for now

   268             //We don't want scroll width to take kerning into account so we don't use the following

   269             //iScrollSize = g.MeasureString(Text + Separator, Font, Int32.MaxValue, iStringFormat);

   270         }

   272         private void HandleTextSizeChange()

   273         {

   274             ComputeSizes();

   276             if (NeedToScroll())

   277             {

   278                 if (ScaleToFit && iFontInUse.SizeInPoints > MinFontSize)

   279                 {

   280                     //Try scaling down

   281                     iFontInUse = new Font(Font.FontFamily, iFontInUse.SizeInPoints - 1, Font.Style);

   282                     //Recurse until we are done

   283                     HandleTextSizeChange();

   284                 }

   285                 else

   286                 {

   287                     if (ScaleToFit)

   288                     {

   289                         //Our minimum font size still needs scrolling

   290                         //Reset our font then

   291                         iFontInUse = new Font(Font,Font.Style);

   292                         ComputeSizes();

   293                     }

   295                     //Scrolling is ok or needed

   296                     //Always align left when scrolling

   297                     iStringFormat.Alignment = StringAlignment.Near;

   298                 }

   299             }

   301             //Reset our timer whenever our text changes

   302             CurrentPosition = 0;

   303             PixelsLeft = 0;

   304             LastTickTime = DateTime.Now;

   305         }

   307         protected override void OnTextChanged(EventArgs e)

   308         {

   309             //Just clone our font

   310             iFontInUse = new Font(Font, Font.Style);

   312             HandleTextSizeChange();

   314             base.OnTextChanged(e);

   315         }

   317         protected override void OnFontChanged(EventArgs e)

   318         {

   319             //Just clone our font

   320             iFontInUse = new Font(Font,Font.Style);

   322             HandleTextSizeChange();

   324             base.OnFontChanged(e);

   325         }

   327         protected override void OnSizeChanged(EventArgs e)

   328         {

   329             //Just clone our font

   330             iFontInUse = new Font(Font, Font.Style);

   332             HandleTextSizeChange();

   334             base.OnSizeChanged(e);

   335         }

   337         protected override void OnTextAlignChanged(EventArgs e)

   338         {

   339             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

   340             if (NeedToScroll())

   341             {

   342                 //Always align left when scrolling to avoid bugs

   343                 iStringFormat.Alignment = StringAlignment.Near;

   344             }

   346             Invalidate();

   347             //

   348             base.OnTextAlignChanged(e);

   349         }

   351         protected override void OnPaint(PaintEventArgs e)

   352         {

   353             //Disable anti-aliasing

   354             e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixelGridFit;

   355             if (NeedToScroll())

   356             {

   357                 //Draw it all in a single call would take kerning into account

   358                 //e.Graphics.TranslateTransform(-(float)CurrentPosition, 0);

   359                 //e.Graphics.DrawString(Text + Separator + Text, Font, iBrush, ClientRectangle, StringFormat);

   361                 //Doing separate draw operation allows us not to take kerning into account between separator and string

   362                 //Draw the first one

   363                 e.Graphics.TranslateTransform(-(float)CurrentPosition, 0);

   364                 e.Graphics.DrawString(Text, iFontInUse, iBrush, ClientRectangle, iStringFormat);

   365                 //Draw separator

   366                 e.Graphics.TranslateTransform(iTextSize.Width, 0);

   367                 e.Graphics.DrawString(Separator, iFontInUse, iBrush, ClientRectangle, iStringFormat);

   368                 //Draw the last one

   369                 e.Graphics.TranslateTransform(iSeparatorSize.Width, 0);

   370                 e.Graphics.DrawString(Text, iFontInUse, iBrush, ClientRectangle, iStringFormat);

   371             }

   372             else

   373             {

   374                 e.Graphics.DrawString(Text, iFontInUse, iBrush, ClientRectangle, iStringFormat);

   375             }

   379             //DrawText is not working without anti-aliasing. See: stackoverflow.com/questions/8283631/graphics-drawstring-vs-textrenderer-drawtextwhich-can-deliver-better-quality

   380             //TextRenderer.DrawText(e.Graphics, Text, Font, ClientRectangle, ForeColor, BackColor, iTextFormatFlags);

   382             //base.OnPaint(e);

   383         }

   385         public bool NeedToScroll()

   386         {

   387             //if (Width < e.Graphics.MeasureString(Text, Font).Width)

   388             if (Width < iTextSize.Width)

   389             {

   390                 return true;

   391             }

   392             return false;

   393         }

   395         protected override void Dispose(bool disposing)

   396         {

   397             if (disposing)

   398             {

   399                 if (Timer != null)

   400                     Timer.Dispose();

   401             }

   402             Timer = null;

   403         }

   404     }

   405 }

author	StephaneLenclud
	Sat, 07 Feb 2015 14:39:03 +0100
changeset 110	31e63bd07dfa
parent 100	7e02ac8b13ba
child 123	0df386e37e29
permissions	-rw-r--r--