SharpDisplayManager: Server/MarqueeLabel.cs@96f8b4dc4300

     1 //

     2 // Copyright (C) 2014-2015 Stéphane Lenclud.

     3 //

     4 // This file is part of SharpDisplayManager.

     5 //

     6 // SharpDisplayManager is free software: you can redistribute it and/or modify

     7 // it under the terms of the GNU General Public License as published by

     8 // the Free Software Foundation, either version 3 of the License, or

     9 // (at your option) any later version.

    10 //

    11 // SharpDisplayManager is distributed in the hope that it will be useful,

    12 // but WITHOUT ANY WARRANTY; without even the implied warranty of

    13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    14 // GNU General Public License for more details.

    15 //

    16 // You should have received a copy of the GNU General Public License

    17 // along with SharpDisplayManager.  If not, see <http://www.gnu.org/licenses/>.

    18 //

    20 using System;

    21 using System.Collections.Generic;

    22 using System.ComponentModel;

    23 using System.Diagnostics;

    24 using System.Linq;

    25 using System.Text;

    26 using System.Threading.Tasks;

    27 //using System.Timers;

    28 using System.Windows.Forms;

    29 using System.Drawing;

    31 namespace SharpDisplayManager

    32 {

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

    34     public class MarqueeLabel : Label

    35     {

    36         private bool iOwnTimer;

    37         private StringFormat iStringFormat;

    38         private SolidBrush iBrush;

    39         private SizeF iTextSize;

    40         private SizeF iSeparatorSize;

    41         private SizeF iScrollSize;

    42         private Font iFontInUse;

    43 		private string iSeparator;

    45         [Category("Appearance")]

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

    47         [DefaultValue(" | ")]

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

    49         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    50         public string Separator

    51 		{

    52 			get

    53 			{

    54 				return iSeparator;

    55 			}

    56 			set

    57 			{

    58 				if (value != Separator)

    59 				{

    60 					iSeparator = value;

    61 					OnTextChanged(EventArgs.Empty);

    62 				}

    63 			}

    64 		}

    66         [Category("Behavior")]

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

    68         [DefaultValue(32)]

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

    70         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    71         public int PixelsPerSecond { get; set; }

    73         [Category("Behavior")]

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

    75         [DefaultValue(false)]

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

    77         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    78         public bool ScaleToFit { get; set; }

    80         [Category("Behavior")]

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

    82         [DefaultValue(15)]

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

    84         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    85         public float MinFontSize { get; set; }

    87         [Category("Behavior")]

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

    89         [DefaultValue(true)]

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

    91         [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

    92         public bool OwnTimer

    93         {

    94             get

    95             {

    96                 return iOwnTimer;

    97             }

    98             set

    99             {

   100                 iOwnTimer = value;

   102                 if (iOwnTimer)

   103                 {

   104                     Timer = new Timer();

   105                     Timer.Interval = 10;

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

   107                     Timer.Start();

   108                 }

   109                 else

   110                 {

   111                     if (Timer != null)

   112                         Timer.Dispose();

   113                     Timer = null;

   114                 }

   116             }

   117         }

   119         private int CurrentPosition { get; set; }

   120         private Timer Timer { get; set; }

   121         private DateTime LastTickTime { get; set; }

   122         private double PixelsLeft { get; set; }

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

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

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

   127         public MarqueeLabel()

   128         {

   129             UseCompatibleTextRendering = true;

   130             //PixelsPerSecond = 32;

   131             LastTickTime = DateTime.Now;

   132             PixelsLeft = 0;

   133             CurrentPosition = 0;

   134             iBrush = new SolidBrush(ForeColor);

   135             MinFontSize = 15;

   136             ScaleToFit = true;

   137             //Just clone our font

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

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

   141             //Without it you get some pretty nasty flicker

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

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

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

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

   146         }

   148         public void UpdateAnimation(DateTime aLastTickTime, DateTime aNewTickTime)

   149         {

   150             if (!NeedToScroll())

   151             {

   152                 CurrentPosition = 0;

   153                 return;

   154             }

   156             /*

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

   158             {

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

   160             }

   161              */

   163             while (CurrentPosition > iScrollSize.Width)

   164             {

   165                 CurrentPosition -= (int)iScrollSize.Width;

   166             }

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

   171             //Keep track of our pixels left over

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

   173             double offset = Math.Truncate(PixelsLeft);

   174             PixelsLeft -= offset;

   176             CurrentPosition += Convert.ToInt32(offset);

   178             /*

   179             if (offset > 1.0)

   180             {

   181                 BackColor = Color.Red;

   182             }

   183             else if (offset==1.0)

   184             {

   185                 if (BackColor != Color.White)

   186                 {

   187                     BackColor = Color.White;

   188                 }

   190             }

   191             else

   192             {

   193                 //Too slow

   194                 //BackColor = Color.Green;

   195             }*/

   197             //Only redraw if something has changed

   198             if (offset != 0)

   199             {

   200                 Invalidate();

   201             }

   202         }

   204         void Timer_Tick(object sender, EventArgs e)

   205         {

   206             DateTime NewTickTime = DateTime.Now;

   207             //

   208             UpdateAnimation(LastTickTime, NewTickTime);

   209             //

   210             LastTickTime = NewTickTime;

   211         }

   213         private StringFormat GetStringFormatFromContentAllignment(ContentAlignment ca)

   214         {

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

   216             switch (ca)

   217             {

   218                 case ContentAlignment.TopCenter:

   219                     format.Alignment = StringAlignment.Center;

   220                     format.LineAlignment = StringAlignment.Near;

   221                     break;

   222                 case ContentAlignment.TopLeft:

   223                     format.Alignment = StringAlignment.Near;

   224                     format.LineAlignment = StringAlignment.Near;

   225                     break;

   226                 case ContentAlignment.TopRight:

   227                     format.Alignment = StringAlignment.Far;

   228                     format.LineAlignment = StringAlignment.Near;

   229                     break;

   230                 case ContentAlignment.MiddleCenter:

   231                     format.Alignment = StringAlignment.Center;

   232                     format.LineAlignment = StringAlignment.Center;

   233                     break;

   234                 case ContentAlignment.MiddleLeft:

   235                     format.Alignment = StringAlignment.Near;

   236                     format.LineAlignment = StringAlignment.Center;

   237                     break;

   238                 case ContentAlignment.MiddleRight:

   239                     format.Alignment = StringAlignment.Far;

   240                     format.LineAlignment = StringAlignment.Center;

   241                     break;

   242                 case ContentAlignment.BottomCenter:

   243                     format.Alignment = StringAlignment.Center;

   244                     format.LineAlignment = StringAlignment.Far;

   245                     break;

   246                 case ContentAlignment.BottomLeft:

   247                     format.Alignment = StringAlignment.Near;

   248                     format.LineAlignment = StringAlignment.Far;

   249                     break;

   250                 case ContentAlignment.BottomRight:

   251                     format.Alignment = StringAlignment.Far;

   252                     format.LineAlignment = StringAlignment.Far;

   253                     break;

   254             }

   256             format.FormatFlags |= StringFormatFlags.NoWrap;

   257             format.FormatFlags |= StringFormatFlags.NoClip;

   258             format.FormatFlags |= StringFormatFlags.MeasureTrailingSpaces;

   259             format.Trimming = StringTrimming.None;

   261             return format;

   262         }

   264         protected override void OnForeColorChanged(EventArgs e)

   265         {

   266             //Color has changed recreate our brush

   267             iBrush = new SolidBrush(ForeColor);

   269             base.OnForeColorChanged(e);

   270         }

   273         private void ComputeSizes()

   274         {

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

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

   277             //Update text size according to text and font

   278             Graphics g = this.CreateGraphics();

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

   280             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

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

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

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

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

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

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

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

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

   289         }

   291         private void HandleTextSizeChange()

   292         {

   293             ComputeSizes();

   295             if (NeedToScroll())

   296             {

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

   298                 {

   299                     //Try scaling down

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

   301                     //Recurse until we are done

   302                     HandleTextSizeChange();

   303                 }

   304                 else

   305                 {

   306                     if (ScaleToFit)

   307                     {

   308                         //Our minimum font size still needs scrolling

   309                         //Reset our font then

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

   311                         ComputeSizes();

   312                     }

   314                     //Scrolling is ok or needed

   315                     //Always align left when scrolling

   316                     iStringFormat.Alignment = StringAlignment.Near;

   317                 }

   318             }

   320             //Reset our timer whenever our text changes

   321             CurrentPosition = 0;

   322             PixelsLeft = 0;

   323             LastTickTime = DateTime.Now;

   324         }

   326         protected override void OnTextChanged(EventArgs e)

   327         {

   328             //Just clone our font

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

   331             HandleTextSizeChange();

   333             base.OnTextChanged(e);

   334         }

   336         protected override void OnFontChanged(EventArgs e)

   337         {

   338             //Just clone our font

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

   341             HandleTextSizeChange();

   343             base.OnFontChanged(e);

   344         }

   346         protected override void OnSizeChanged(EventArgs e)

   347         {

   348             //Just clone our font

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

   351             HandleTextSizeChange();

   353             base.OnSizeChanged(e);

   354         }

   356         protected override void OnTextAlignChanged(EventArgs e)

   357         {

   358             iStringFormat = GetStringFormatFromContentAllignment(TextAlign);

   359             if (NeedToScroll())

   360             {

   361                 //Always align left when scrolling to avoid bugs

   362                 iStringFormat.Alignment = StringAlignment.Near;

   363             }

   365             Invalidate();

   366             //

   367             base.OnTextAlignChanged(e);

   368         }

   370         protected override void OnPaint(PaintEventArgs e)

   371         {

   372             //Disable anti-aliasing

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

   374             if (NeedToScroll())

   375             {

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

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

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

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

   381                 //Draw the first one

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

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

   384                 //Draw separator

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

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

   387                 //Draw the last one

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

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

   390             }

   391             else

   392             {

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

   394             }

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

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

   401             //base.OnPaint(e);

   402         }

   404         public bool NeedToScroll()

   405         {

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

   407             if (Width < iTextSize.Width)

   408             {

   409                 return true;

   410             }

   411             return false;

   412         }

   414         protected override void Dispose(bool disposing)

   415         {

   416             if (disposing)

   417             {

   418                 if (Timer != null)

   419                     Timer.Dispose();

   420             }

   421             Timer = null;

   422         }

   423     }

   424 }

author	StephaneLenclud
	Sat, 23 Jul 2016 19:22:56 +0200
changeset 211	96f8b4dc4300
parent 110	31e63bd07dfa
child 253	2dae7a163fff
permissions	-rw-r--r--