Rotate TextBlock /!\ Resize not suported

ProjetTheAlone/ViewModel/TextDefilant.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Timers;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace ProjetTheAlone.ViewModel
+{
+    class TextDefilant : BasePropriete
+    {
+        Timer aTimer;
+
+        TextBlock textContainer;
+        char[] textAfficherBuffer;
+        public string TextAfficher { set => fillBuffer(value); get { return new string(textAfficherBuffer); } }
+
+
+        public TextDefilant(TextBlock tb, string text, int timeMs)
+        {
+            this.textContainer = tb;
+            TextAfficher = text;
+            SetTimer(timeMs);
+            aTimer.Enabled = true;
+        }
+
+        private void SetTimer(int timeMs)
+        {
+            // Create a timer with a two second interval.
+            aTimer = new System.Timers.Timer(timeMs);
+            // Hook up the Elapsed event for the timer. 
+            aTimer.Elapsed += OnTimedEvent;
+            aTimer.AutoReset = true;
+        }
+
+        private void OnTimedEvent(Object source, ElapsedEventArgs e)
+        {
+            textAfficherBuffer = RotateChar(textAfficherBuffer);
+            OnPropertyChanged("TextAfficher");
+        }
+
+
+        private void fillBuffer(string text)
+        {
+            char[] charToTrim = { '\r', '\n' };
+            text = text.Trim(charToTrim);
+            double WTB = textContainer.ActualWidth; //With of textBlock container
+            double WT = MeasureString(text).Width; //With of Text
+            double WS = MeasureString(" ").Width; //With of whiteSpace
+            int nbSp = (int)Math.Ceiling((WTB - WT) / WS); //number of space need to fill textBlock
+            char[] spText = new string(' ', nbSp).ToCharArray();
+            this.textAfficherBuffer = new char[nbSp + text.ToCharArray().Length];
+            Array.Copy(text.ToCharArray(), 0, this.textAfficherBuffer, 0, text.Length);
+            Array.Copy(spText, 0, this.textAfficherBuffer, text.Length, spText.Length);
+        }
+        private char[] RotateChar(char[] txt)
+        {
+            char[] oldTxt = txt;
+            char[] newTxt = new char[oldTxt.Length];
+            char fc = txt[0];
+            for (int i = oldTxt.Length - 1; i > 0; i--)
+                newTxt[((i+1)%oldTxt.Length)] = oldTxt[i];
+            newTxt[1] = fc;
+            return newTxt;
+        }
+
+        //https://stackoverflow.com/questions/9264398/how-to-calculate-wpf-textblock-width-for-its-known-font-size-and-characters
+        private Size MeasureString(string candidate)
+        {
+            var formattedText = new FormattedText(
+                candidate,
+                CultureInfo.CurrentCulture,
+                FlowDirection.LeftToRight,
+                new Typeface(this.textContainer.FontFamily, this.textContainer.FontStyle, this.textContainer.FontWeight, this.textContainer.FontStretch),
+                this.textContainer.FontSize,
+                Brushes.Black,
+                new NumberSubstitution(), (TextFormattingMode)1);
+
+            return new Size(formattedText.WidthIncludingTrailingWhitespace, formattedText.Height);
+        }
+    }
+}