SharpDisplayManager: Server/MarqueeLabel.cs@9c4a78195ac4

     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;

    24         [Category("Appearance")]

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

    26         [DefaultValue(" | ")]

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

    28         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    29         public string Separator { get; set; }

    31         [Category("Behavior")]

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

    33         [DefaultValue(32)]

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

    35         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    36         public int PixelsPerSecond { get; set; }

    38         [Category("Behavior")]

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

    40         [DefaultValue(true)]

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

    42         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    43         public bool OwnTimer

    44         {

    45             get

    46             {

    47                 return iOwnTimer;

    48             }

    49             set

    50             {

    51                 iOwnTimer = value;

    53                 if (iOwnTimer)

    54                 {

    55                     Timer = new Timer();

    56                     Timer.Interval = 10;

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

    58                     Timer.Start();

    59                 }

    60                 else

    61                 {

    62                     if (Timer != null)

    63                         Timer.Dispose();

    64                     Timer = null;

    65                 }

    67             }

    68         }

    70         private int CurrentPosition { get; set; }

    71         private Timer Timer { get; set; }

    72         private DateTime LastTickTime { get; set; }

    73         private double PixelsLeft { get; set; }

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

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

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

    78         public MarqueeLabel()

    79         {

    80             UseCompatibleTextRendering = true;

    81             //PixelsPerSecond = 32;

    82             LastTickTime = DateTime.Now;

    83             PixelsLeft = 0;

    84             CurrentPosition = 0;

    85             iBrush = new SolidBrush(ForeColor);

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

    88             //Without it you get some pretty nasty flicker

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

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

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

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

    93         }

    95         public void UpdateAnimation(DateTime aLastTickTime, DateTime aNewTickTime)

    96         {

    97             if (!NeedToScroll())

    98             {

    99                 CurrentPosition = 0;

   100                 return;

   101             }

   103             /*

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

   105             {

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

   107             }

   108              */

   110             while (CurrentPosition > iScrollSize.Width)

   111             {

   112                 CurrentPosition -= (int)iScrollSize.Width;

   113             }

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

   118             //Keep track of our pixels left over

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

   120             double offset = Math.Truncate(PixelsLeft);

   121             PixelsLeft -= offset;

   123             CurrentPosition += Convert.ToInt32(offset);

   125             /*

   126             if (offset > 1.0)

   127             {

   128                 BackColor = Color.Red;

   129             }

   130             else if (offset==1.0)

   131             {

   132                 if (BackColor != Color.White)

   133                 {

   134                     BackColor = Color.White;

   135                 }

   137             }

   138             else

   139             {

   140                 //Too slow

   141                 //BackColor = Color.Green;

   142             }*/

   144             //Only redraw if something has changed

   145             if (offset != 0)

   146             {

   147                 Invalidate();

   148             }

   149         }

   151         void Timer_Tick(object sender, EventArgs e)

   152         {

   153             DateTime NewTickTime = DateTime.Now;

   154             //

   155             UpdateAnimation(LastTickTime, NewTickTime);

   156             //

   157             LastTickTime = NewTickTime;

   158         }

   160         private StringFormat GetStringFormatFromContentAllignment(ContentAlignment ca)

   161         {

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

   163             switch (ca)

   164             {

   165                 case ContentAlignment.TopCenter:

   166                     format.Alignment = StringAlignment.Center;

   167                     format.LineAlignment = StringAlignment.Near;

   168                     break;

   169                 case ContentAlignment.TopLeft:

   170                     format.Alignment = StringAlignment.Near;

   171                     format.LineAlignment = StringAlignment.Near;

   172                     break;

   173                 case ContentAlignment.TopRight:

   174                     format.Alignment = StringAlignment.Far;

   175                     format.LineAlignment = StringAlignment.Near;

   176                     break;

   177                 case ContentAlignment.MiddleCenter:

   178                     format.Alignment = StringAlignment.Center;

   179                     format.LineAlignment = StringAlignment.Center;

   180                     break;

   181                 case ContentAlignment.MiddleLeft:

   182                     format.Alignment = StringAlignment.Near;

   183                     format.LineAlignment = StringAlignment.Center;

   184                     break;

   185                 case ContentAlignment.MiddleRight:

   186                     format.Alignment = StringAlignment.Far;

   187                     format.LineAlignment = StringAlignment.Center;

   188                     break;

   189                 case ContentAlignment.BottomCenter:

   190                     format.Alignment = StringAlignment.Center;

   191                     format.LineAlignment = StringAlignment.Far;

   192                     break;

   193                 case ContentAlignment.BottomLeft:

   194                     format.Alignment = StringAlignment.Near;

   195                     format.LineAlignment = StringAlignment.Far;

   196                     break;

   197                 case ContentAlignment.BottomRight:

   198                     format.Alignment = StringAlignment.Far;

   199                     format.LineAlignment = StringAlignment.Far;

   200                     break;

   201             }

   203             format.FormatFlags |= StringFormatFlags.NoWrap;

   204             format.FormatFlags |= StringFormatFlags.NoClip;

   205             format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;

   206             format.Trimming = StringTrimming.None;

   208             return format;

   209         }

   211         protected override void OnForeColorChanged(EventArgs e)

   212         {

   213             //Color has changed recreate our brush

   214             iBrush = new SolidBrush(ForeColor);

   216             base.OnForeColorChanged(e);

   217         }

   220         private void HandleTextSizeChange()

   221         {

   222             //Reset our timer whenever our text changes

   223             CurrentPosition = 0;

   224             LastTickTime = DateTime.Now;

   225             PixelsLeft = 0;

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

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

   229             //Update text size according to text and font

   230             Graphics g = this.CreateGraphics();

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

   232             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

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

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

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

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

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

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

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

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

   242             if (NeedToScroll())

   243             {

   244                 //Always align left when scrolling

   245                 iStringFormat.Alignment = StringAlignment.Near;

   246             }

   248         }

   250         protected override void OnTextChanged(EventArgs e)

   251         {

   252             HandleTextSizeChange();

   254             base.OnTextChanged(e);

   255         }

   257         protected override void OnFontChanged(EventArgs e)

   258         {

   259             HandleTextSizeChange();

   261             base.OnFontChanged(e);

   262         }

   264         protected override void OnTextAlignChanged(EventArgs e)

   265         {

   266             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

   267             if (NeedToScroll())

   268             {

   269                 //Always align left when scrolling to avoid bugs

   270                 iStringFormat.Alignment = StringAlignment.Near;

   271             }

   273             Invalidate();

   274             //

   275             base.OnTextAlignChanged(e);

   276         }

   278         protected override void OnPaint(PaintEventArgs e)

   279         {

   280             //Disable anti-aliasing

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

   282             if (NeedToScroll())

   283             {

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

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

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

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

   289                 //Draw the first one

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

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

   292                 //Draw separator

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

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

   295                 //Draw the last one

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

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

   298             }

   299             else

   300             {

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

   302             }

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

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

   309             //base.OnPaint(e);

   310         }

   312         public bool NeedToScroll()

   313         {

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

   315             if (Width < iTextSize.Width)

   316             {

   317                 return true;

   318             }

   319             return false;

   320         }

   322         protected override void Dispose(bool disposing)

   323         {

   324             if (disposing)

   325             {

   326                 if (Timer != null)

   327                     Timer.Dispose();

   328             }

   329             Timer = null;

   330         }

   331     }

   332 }

author	sl
	Sun, 11 Jan 2015 18:34:52 +0100
changeset 85	9c4a78195ac4
parent 41	1864e4fd1728
child 100	7e02ac8b13ba
permissions	-rw-r--r--