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