Computer Shopper 235

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/ Computer Shopper 235 / Issue 235 - September 2007 - DPCS0907DVD.ISO / Microsoft / Expression Blend / Blend.en.msi / Sparkle.GPiano.Window1.xaml.cs.en < prev next >

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Text File | 2007-03-19 | 37.5 KB | 592 lines

■using System; using System.IO; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Navigation; using System.Windows.Input; using System.Collections.Generic; using System.Diagnostics; using System.Timers; using Microsoft.Win32; using System.Collections.ObjectModel; namespace GrandPiano { public partial class Window1 { // Current note played. String note = ""; // While a note is pressed value = true. Boolean isKeyPressed = false; // Holds names of the notes to be used in a foreach loop. List<string> notesCache = new List<string>(); // Song that is saved and loaded. List<Keyframe> song = new List<Keyframe>(); // Recording and Playback flags. Boolean isRecording = false; Boolean isPlaying = false; // Time references for playback. TimeSpan currentTime; TimeSpan totalTime; // Keeps track of the next note that will play to synchronize with Fast Forward and Rewind. Keyframe nextNoteToPlay; int indexNextNote; // Timer that controls Recording and Playback. Timer tick = new Timer(); int min = 0; int sec = 0; int dec = 0; #region Initialization public Window1() { this.InitializeComponent(); } /// <summary> /// This method makes sure that all the elements are already loaded and ready, /// then it plays all the audio files to make sure they are cached in memory and improve performance. /// </summary> protected override void OnInitialized(EventArgs e) { base.OnInitialized(e); CacheAudioFiles(); } /// <summary> /// Plays all audio files to improve performance when they play for the first time. /// Notes as C_7 indicates C# (D_7 is D#). /// </summary> private void CacheAudioFiles() { notesCache.Add("C7"); notesCache.Add("C_7"); notesCache.Add("D7"); notesCache.Add("D_7"); notesCache.Add("E7"); notesCache.Add("F7"); notesCache.Add("F_7"); notesCache.Add("G7"); notesCache.Add("G_7"); notesCache.Add("A7"); notesCache.Add("A_7"); notesCache.Add("B7"); ChangeNotesMute(true); foreach (string n in notesCache) { FrameworkElement audioKey = (FrameworkElement)keys.FindName(n); Storyboard s = (Storyboard)audioKey.FindResource(n + "_wma"); s.Begin(audioKey); } } private void ChangeNotesMute(bool mute) { foreach (string n in notesCache) { MediaElement m = (MediaElement)audio.FindName(n + "_wma"); m.IsMuted = mute; } } #endregion #region File Management private void OnLoadSong(object sender, RoutedEventArgs e) { OnOpenFile(); } private void OnSaveSong(object sender, RoutedEventArgs e) { if (song.Count > 0) { OnSaveFile(); } else { MessageBox.Show("There is no song to save."); } } private void OnExit(object sender, RoutedEventArgs e) { this.Close(); } /// <summary> /// Saves the song in a binary file. /// Because TimeSpan can't be saved directly, it is converted to String. /// </summary> public void Save(string fileName) { if (File.Exists(fileName)) { MessageBox.Show("{0} already exists!", fileName); return; } FileStream fs = new FileStream(fileName, FileMode.CreateNew); BinaryWriter w = new BinaryWriter(fs); foreach (Keyframe k in this.song) { String time = k.Time.ToString(); w.Write(time); String note = k.Note; w.Write(note); } w.Close(); fs.Close(); } /// <summary> /// Loaded the binary file, converting time from String back to TimeSpan. /// </summary> public void Load(String fileName) { FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read); BinaryReader r = new BinaryReader(fs); song = new List<Keyframe>(); while (fs.Position < fs.Length) { String t = r.ReadString(); String[] splitMin = t.Split(':'); int min = Convert.ToInt32(splitMin[1]); String[] splitSecDec = splitMin[2].Split('.'); int sec = Convert.ToInt32(splitSecDec[0]); int dec; if (splitSecDec.Length > 1) { dec = Convert.ToInt32(splitSecDec[1]); } else { dec = 0; } dec /= 100000; TimeSpan time = new TimeSpan(0, 0, min, sec, (dec * 10)); String note = r.ReadString(); Keyframe k = new Keyframe(time, note); song.Add(k); } r.Close(); fs.Close(); } void OnOpenFile() { OpenFileDialog fileDialog = new OpenFileDialog(); fileDialog.Title = "Open Song"; fileDialog.RestoreDirectory = true; fileDialog.InitialDirectory = System.IO.Directory.GetCurrentDirectory(); fileDialog.Filter = "Grand Piano Songs (*.gps)|*.gps"; bool? dialogResult = fileDialog.ShowDialog(this); if (dialogResult.HasValue && dialogResult.Value) { try { this.Load(fileDialog.FileName); } catch (Exception exception) { string error = String.Format("Cannot open file '{0}'.\n{1}", fileDialog.FileName, exception.Message); MessageBox.Show(this, error, "Cannot open file", MessageBoxButton.OK, MessageBoxImage.Error); } } } void OnSaveFile() { SaveFileDialog fileDialog = new SaveFileDialog(); fileDialog.Title = "Save Song As"; fileDialog.RestoreDirectory = true; fileDialog.InitialDirectory = System.IO.Directory.GetCurrentDirectory(); fileDialog.Filter = "Grand Piano Songs (*.gps)|*.gps"; bool? dialogResult = fileDialog.ShowDialog(this); if (dialogResult.HasValue && dialogResult.Value) { try { this.Save(fileDialog.FileName); } catch (Exception exception) { string error = String.Format("Cannot save file '{0}'.\n{1}", fileDialog.FileName, exception.Message); MessageBox.Show(this, error, "Cannot save file", MessageBoxButton.OK, MessageBoxImage.Error); } } } #endregion #region Key Events protected override void OnTextInput(TextCompositionEventArgs e) { if ((string.IsNullOrEmpty(this.note)) && (!isPlaying)) { HideKeyImage(); note = ""; switch (e.Text.ToLower()) { case "z": note = "C7"; break; case "s": note = "C_7"; break; case "x": note = "D7"; break; case "d": note = "D_7"; break; case "c": note = "E7"; break; case "v": note = "F7"; break; case "g": note = "F_7"; break; case "b": note = "G7"; break; case "h": note = "G_7"; break; case "n": note = "A7"; break; case "j": note = "A_7"; break; case "m": note = "B7"; break; default: break; } PlayNote(); if (!string.IsNullOrEmpty(note)) { base.OnTextInput(e); } else { e.Handled = true; } } } protected override void OnKeyUp(KeyEventArgs e) { if (!isPlaying) { base.OnKeyUp(e); HideKeyImage(); this.note = ""; } } #endregion #region Mouse Events private void OnMouseDown(object sender, MouseButtonEventArgs e) { if (!isPlaying) { FrameworkElement me = sender as FrameworkElement; note = me.Name.ToString(); PlayNote(); } } private void OnMouseUp(object sender, MouseButtonEventArgs e) { if (!isPlaying) { HideKeyImage(); } } #endregion #region Piano Keys and Notes private void PlayNote() { // The audio is muted because of cache initialization. // The first time they play it is necessary to unmute. if (C7_wma.IsMuted) ChangeNotesMute(false); if ((note != "") && (!isKeyPressed)) { isKeyPressed = true; FrameworkElement audioKey = (FrameworkElement)keys.FindName(note); FrameworkElement imgKey = (FrameworkElement)keys.FindName("key" + note); imgKey.Visibility = Visibility.Visible; // Each note is played as simple Storyboard with a MediaTimeline. Storyboard s = (Storyboard)audioKey.FindResource(note + "_wma"); s.Begin(audioKey); if (isRecording) SetKeyframe(note); } } private void HideKeyImage() { if (note != "") { FrameworkElement imgKey = (FrameworkElement)keys.FindName("key" + note); imgKey.Visibility = Visibility.Hidden; isKeyPressed = false; note = ""; } } #endregion #region Playback and Recording /// <summary> /// Sets a keyframe using the Data Model Keyframe, which holds: /// 1. Time the note is played. /// 2. Note played. /// </summary> private void SetKeyframe(String note) { Keyframe k = new Keyframe(new TimeSpan(0, 0, min, sec, (dec * 10)), note); song.Add(k); } private void OnPlay(object sender, RoutedEventArgs e) { if (!isRecording) { if (song.Count != 0) { if (!isPlaying) { GetTotalTime(); min = sec = dec = 0; isPlaying = true; Storyboard rec = (Storyboard)LayoutRoot.FindResource("showPlaying"); rec.Begin(LayoutRoot); tick.Elapsed += new ElapsedEventHandler(tick_ElapsedPlay); tick.Interval = 100; tick.Start(); // Gets the first note to play if (song.Count > 1) { UpdateCurrentTime(); indexNextNote = 0; nextNoteToPlay = song[indexNextNote]; } } } else { Storyboard rec = (Storyboard)LayoutRoot.FindResource("showEmpty"); rec.Begin(LayoutRoot); } } } private void OnStop(object sender, RoutedEventArgs e) { if (isRecording) { StopRecording(); } else if (isPlaying) { isPlaying = false; Storyboard rec = (Storyboard)LayoutRoot.FindResource("hidePlaying"); rec.Begin(LayoutRoot); tick.Elapsed -= new ElapsedEventHandler(tick_ElapsedPlay); tick.Stop(); } } private void OnRec(object sender, RoutedEventArgs e) { if (!isPlaying) { if (isRecording) { StopRecording(); } else { min = sec = dec = 0; song = new List<Keyframe>(); isRecording = true; recOn.Visibility = Visibility.Visible; Storyboard rec = (Storyboard)LayoutRoot.FindResource("showRecording"); rec.Begin(LayoutRoot); tick.Elapsed += new ElapsedEventHandler(tick_ElapsedRec); tick.Interval = 100; tick.Start(); } } } private void StopRecording() { isRecording = false; recOn.Visibility = Visibility.Hidden; Storyboard rec = (Storyboard)LayoutRoot.FindResource("hideRecording"); rec.Begin(LayoutRoot); SetKeyframe("END"); tick.Elapsed -= new ElapsedEventHandler(tick_ElapsedRec); tick.Stop(); } /// <summary> /// Updates the display of the recording elapsed time. /// </summary> void tick_ElapsedRec(object sender, ElapsedEventArgs e) { DelayedCallback.Invoke(TimeSpan.FromSeconds(0), delegate() { recTime.Text = GetElapsedTime(); }); } /// <summary> /// Plays notes and updates the display of the playback elapsed time. /// </summary> void tick_ElapsedPlay(object sender, ElapsedEventArgs e) { DelayedCallback.Invoke(TimeSpan.FromSeconds(0), delegate() { UpdateCurrentTime(); if (currentTime != totalTime) { if (song.Count > 1) { HideKeyImage(); if (currentTime == nextNoteToPlay.Time) { note = nextNoteToPlay.Note; isKeyPressed = false; PlayNote(); indexNextNote++; nextNoteToPlay = song[indexNextNote]; } } playTimeElapsed.Text = GetElapsedTime(); } else { HideKeyImage(); isPlaying = false; Storyboard rec = (Storyboard)LayoutRoot.FindResource("hidePlaying"); rec.Begin(LayoutRoot); tick.Elapsed -= new ElapsedEventHandler(tick_ElapsedPlay); tick.Stop(); } }); } private void UpdateCurrentTime() { currentTime = new TimeSpan(0, 0, min, sec, (dec * 10)); } private String GetElapsedTime() { dec++; if (dec == 10) { dec = 0; sec++; } if (sec == 60) { sec = 0; min++; } String secStr = sec.ToString(); String minStr = min.ToString(); if (sec < 10) secStr = "0" + secStr; if (min < 10) minStr = "0" + minStr; return minStr + ":" + secStr + ":" + dec; } private String GetTotalTime() { Keyframe lastKey = song[song.Count - 1]; totalTime = lastKey.Time; double ticks = totalTime.Milliseconds / 10; double dec = Math.Floor(ticks); int sec = totalTime.Seconds; int min = totalTime.Minutes; String decStr = dec.ToString(); String secStr = sec.ToString(); String minStr = min.ToString(); if (sec < 10) secStr = "0" + secStr; if (min < 10) minStr = "0" + minStr; return minStr + ":" + secStr + ":" + decStr; } private void OnForward(object sender, RoutedEventArgs e) { if (isPlaying) { indexNextNote = (indexNextNote + 1 > (song.Count - 1)) ? (song.Count - 1) : indexNextNote + 1; nextNoteToPlay = song[indexNextNote]; currentTime = song[indexNextNote].Time; min = currentTime.Minutes; sec = currentTime.Seconds; dec = 0; } } private void OnRewind(object sender, RoutedEventArgs e) { if (isPlaying) { indexNextNote = (indexNextNote - 1 < 0) ? 0 : indexNextNote - 1; nextNoteToPlay = song[indexNextNote]; currentTime = song[indexNextNote].Time; min = currentTime.Minutes; sec = currentTime.Seconds; dec = 0; } } #endregion } }