SharpDisplayManager: Server/MarqueeLabel.cs@babab407f2bb

     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 ContentAlignment iRequestedContentAlignment;

    25         [Category("Appearance")]

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

    27         [DefaultValue(" | ")]

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

    29         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    30         public string Separator { get; set; }

    32         [Category("Behavior")]

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

    34         [DefaultValue(32)]

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

    36         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    37         public int PixelsPerSecond { get; set; }

    39         [Category("Behavior")]

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

    41         [DefaultValue(true)]

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

    43         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    44         public bool OwnTimer

    45         {

    46             get

    47             {

    48                 return iOwnTimer;

    49             }

    50             set

    51             {

    52                 iOwnTimer = value;

    54                 if (iOwnTimer)

    55                 {

    56                     Timer = new Timer();

    57                     Timer.Interval = 10;

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

    59                     Timer.Start();

    60                 }

    61                 else

    62                 {

    63                     if (Timer != null)

    64                         Timer.Dispose();

    65                     Timer = null;

    66                 }

    68             }

    69         }

    71         private int CurrentPosition { get; set; }

    72         private Timer Timer { get; set; }

    73         private DateTime LastTickTime { get; set; }

    74         private double PixelsLeft { get; set; }

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

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

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

    79         public MarqueeLabel()

    80         {

    81             UseCompatibleTextRendering = true;

    82             //PixelsPerSecond = 32;

    83             LastTickTime = DateTime.Now;

    84             PixelsLeft = 0;

    85             CurrentPosition = 0;

    86             iBrush = new SolidBrush(ForeColor);

    87             //iRequestedContentAlignment = TextAlign;

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

    90             //Without it you get some pretty nasty flicker

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

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

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

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

    95         }

    97         public void UpdateAnimation(DateTime aLastTickTime, DateTime aNewTickTime)

    98         {

    99             if (!NeedToScroll())

   100             {

   101                 CurrentPosition = 0;

   102                 return;

   103             }

   105             /*

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

   107             {

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

   109             }

   110              */

   112             while (CurrentPosition > iScrollSize.Width)

   113             {

   114                 CurrentPosition -= (int)iScrollSize.Width;

   115             }

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

   120             //Keep track of our pixels left over

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

   122             double offset = Math.Truncate(PixelsLeft);

   123             PixelsLeft -= offset;

   125             CurrentPosition += Convert.ToInt32(offset);

   127             /*

   128             if (offset > 1.0)

   129             {

   130                 BackColor = Color.Red;

   131             }

   132             else if (offset==1.0)

   133             {

   134                 if (BackColor != Color.White)

   135                 {

   136                     BackColor = Color.White;

   137                 }

   139             }

   140             else

   141             {

   142                 //Too slow

   143                 //BackColor = Color.Green;

   144             }*/

   146             //Only redraw if something has changed

   147             if (offset != 0)

   148             {

   149                 Invalidate();

   150             }

   151         }

   153         void Timer_Tick(object sender, EventArgs e)

   154         {

   155             DateTime NewTickTime = DateTime.Now;

   156             //

   157             UpdateAnimation(LastTickTime, NewTickTime);

   158             //

   159             LastTickTime = NewTickTime;

   160         }

   162         private StringFormat GetStringFormatFromContentAllignment(ContentAlignment ca)

   163         {

   164             StringFormat format = new StringFormat();

   165             format = StringFormat.GenericTypographic;

   166             switch (ca)

   167             {

   168                 case ContentAlignment.TopCenter:

   169                     format.Alignment = StringAlignment.Center;

   170                     format.LineAlignment = StringAlignment.Near;

   171                     break;

   172                 case ContentAlignment.TopLeft:

   173                     format.Alignment = StringAlignment.Near;

   174                     format.LineAlignment = StringAlignment.Near;

   175                     break;

   176                 case ContentAlignment.TopRight:

   177                     format.Alignment = StringAlignment.Far;

   178                     format.LineAlignment = StringAlignment.Near;

   179                     break;

   180                 case ContentAlignment.MiddleCenter:

   181                     format.Alignment = StringAlignment.Center;

   182                     format.LineAlignment = StringAlignment.Center;

   183                     break;

   184                 case ContentAlignment.MiddleLeft:

   185                     format.Alignment = StringAlignment.Near;

   186                     format.LineAlignment = StringAlignment.Center;

   187                     break;

   188                 case ContentAlignment.MiddleRight:

   189                     format.Alignment = StringAlignment.Far;

   190                     format.LineAlignment = StringAlignment.Center;

   191                     break;

   192                 case ContentAlignment.BottomCenter:

   193                     format.Alignment = StringAlignment.Center;

   194                     format.LineAlignment = StringAlignment.Far;

   195                     break;

   196                 case ContentAlignment.BottomLeft:

   197                     format.Alignment = StringAlignment.Near;

   198                     format.LineAlignment = StringAlignment.Far;

   199                     break;

   200                 case ContentAlignment.BottomRight:

   201                     format.Alignment = StringAlignment.Far;

   202                     format.LineAlignment = StringAlignment.Far;

   203                     break;

   204             }

   206             format.FormatFlags |= StringFormatFlags.NoWrap;

   207             format.FormatFlags |= StringFormatFlags.NoClip;

   208             format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;

   209             format.Trimming = StringTrimming.None;

   211             return format;

   212         }

   214         protected override void OnForeColorChanged(EventArgs e)

   215         {

   216             //Color has changed recreate our brush

   217             iBrush = new SolidBrush(ForeColor);

   219             base.OnForeColorChanged(e);

   220         }

   223         private void HandleTextSizeChange()

   224         {

   225             //Reset our timer whenever our text changes

   226             CurrentPosition = 0;

   227             LastTickTime = DateTime.Now;

   228             PixelsLeft = 0;

   229             //Reset text align

   230             //TextAlign = iRequestedContentAlignment;

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

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

   234             //Update text size according to text and font

   235             Graphics g = this.CreateGraphics();

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

   237             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

   238             iTextSize = g.MeasureString(Text, Font, Int32.MaxValue, iStringFormat);

   239             iSeparatorSize = g.MeasureString(Separator, Font, Int32.MaxValue, iStringFormat);

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

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

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

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

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

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

   247             if (NeedToScroll())

   248             {

   249                 //Always align left when scrolling

   250                 //Somehow draw string still takes into our control alignment so we need to set it too

   251                 //ContentAlignment original = TextAlign;

   252                 TextAlign = ContentAlignment.MiddleLeft;

   253                 //Make sure our original text alignment remain the same even though we override it when scrolling

   254                 //iRequestedContentAlignment = original;

   255                 //iStringFormat will get updated in OnTextAlignChanged

   256                 //iStringFormat.Alignment = StringAlignment.Near;

   257             }

   258         }

   260         protected override void OnTextChanged(EventArgs e)

   261         {

   262             HandleTextSizeChange();

   264             base.OnTextChanged(e);

   265         }

   267         protected override void OnFontChanged(EventArgs e)

   268         {

   269             HandleTextSizeChange();

   271             base.OnFontChanged(e);

   272         }

   274         protected override void OnTextAlignChanged(EventArgs e)

   275         {

   276             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

   277             //iRequestedContentAlignment = TextAlign;

   278             base.OnTextAlignChanged(e);

   280         }

   282         protected override void OnPaint(PaintEventArgs e)

   283         {

   284             //Disable anti-aliasing

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

   286             if (NeedToScroll())

   287             {

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

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

   290                 //e.Graphics.DrawString(Text + Separator + Text, Font, iBrush, ClientRectangle, iStringFormat);

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

   293                 //Draw the first one

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

   295                 e.Graphics.DrawString(Text, Font, iBrush, ClientRectangle, iStringFormat);

   296                 //Draw separator

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

   298                 e.Graphics.DrawString(Separator, Font, iBrush, ClientRectangle, iStringFormat);

   299                 //Draw the last one

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

   301                 e.Graphics.DrawString(Text, Font, iBrush, ClientRectangle, iStringFormat);

   302             }

   303             else

   304             {

   305                 e.Graphics.DrawString(Text, Font, iBrush, ClientRectangle, iStringFormat);

   306             }

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

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

   313             //base.OnPaint(e);

   314         }

   316         public bool NeedToScroll()

   317         {

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

   319             if (Width < iTextSize.Width)

   320             {

   321                 return true;

   322             }

   323             return false;

   324         }

   326         protected override void Dispose(bool disposing)

   327         {

   328             if (disposing)

   329             {

   330                 if (Timer != null)

   331                     Timer.Dispose();

   332             }

   333             Timer = null;

   334         }

   335     }

   336 }

author	sl
	Wed, 20 Aug 2014 18:02:30 +0200
changeset 38	babab407f2bb
parent 34	59bfa4ebcbbb
child 41	1864e4fd1728
permissions	-rw-r--r--