pythonnetLab/Test/REPLinWPF.cs at master · harperjohnarc/pythonnetLab · GitHub

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using Python.Runtime;

using System;

using System.IO;

using System.Text;

using System.Threading;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Input;

namespace Test

{

class REPLinWPF

{

static AutoResetEvent mEvent = new AutoResetEvent(false);

public static void Main()

{

Thread th = new Thread(

() => {

Window window = new Window();

window.Content = new REPLTextBox();

window.ShowDialog();

mEvent.Set();

}

);

th.SetApartmentState(ApartmentState.STA);

th.Start();

mEvent.WaitOne();

}

public class REPLTextBox : UserControl

{

public REPLTextBox()

{

this.TB = new TextBox()

{

HorizontalAlignment = HorizontalAlignment.Stretch,

VerticalAlignment = VerticalAlignment.Stretch

};

this.Content = this.TB;

this.Prompt = ">>> ";

this.HistoryCommand = new StringBuilder();

this.TB.Text = "";

this.TextBasePosition = 0;

using (Py.GIL())

{

this.WelcomeMsg = $"Python{PythonEngine.Version}\n";

}

this.Clear();

this.TB.KeyDown += new KeyEventHandler(this._OnKeyDown);

this.TB.PreviewKeyDown += new KeyEventHandler(this._OnPreviewKeyDown);

this.TB.PreviewTextInput += new TextCompositionEventHandler(this._OnPreviewTextInput);

this.PreviewKeyUp += new KeyEventHandler(this._OnPreviewKeyUp);

this.TB.KeyUp += new KeyEventHandler(this._OnKeyUp);

using (Py.GIL())

{

PyScope = Py.CreateScope();

}

Console.SetOut(new TBTextWriter(this));

}

private TextBox TB;

private PyScope PyScope;

// It's not enough when block input is needed.

private int TextBasePosition;

private string WelcomeMsg;

private string HistoryText;

public string Prompt

{

get;

private set;

}

//StringBuilder will be replace with a custom class

// it will be used in _OnKeyUp

public StringBuilder HistoryCommand

{

get;

private set;

}

//text behind Base Postion cannot be deleted with backspace

private void UpdateTextBasePosition()

{

this.TextBasePosition = this.TB.Text.Length;

this.HistoryText = this.TB.Text;

}

private void Clear()

{

this.TB.Text = this.WelcomeMsg;

this.TB.Text += this.Prompt;

this.UpdateTextBasePosition();

this.TB.ScrollToEnd();

this.HistoryCommand.Clear();

}

private void WriteLine(string value)

{

this.TB.Text += value;

this.TB.Text += Environment.NewLine;

}

public void Write(string value)

{

this.TB.Text += value;

}

//It will triggered first

//But, it's only triggered after cursor moved by user

private void _OnPreviewKeyDown(object sender, KeyEventArgs e)

{

if ((int)e.Key < 34)

{

return;

}

if (this.TB.SelectionStart < this.TextBasePosition)

{

this.TB.SelectionStart = this.TextBasePosition;

this.TB.SelectionLength = 0;

e.Handled = true;

}

private void _OnKeyDown(object sender, KeyEventArgs e)

{

if (e.Key == Key.Return | e.Key == Key.Enter) // Catch a carrage return

{

this.SendCommand();

}

/// <summary>

/// send the command to python

/// </summary>

private void SendCommand()

{

string rawCommand = this.TB.Text.Remove(0, this.TextBasePosition).Trim();

if (rawCommand.EndsWith(":"))

{

// Not implement

this.TB.Text += Environment.NewLine;

this.TB.Text += this.Prompt;

this.Focus();

this.TB.Select(this.TB.Text.Length, 0); //move cursor to the end

return;

}

if (!string.IsNullOrEmpty(rawCommand))

{

this.TB.Text += Environment.NewLine;

using (Py.GIL())

{

try

{

PyObject script = PythonEngine.Compile(rawCommand, "", RunFlagType.Single);

var res = this.PyScope.Execute(script);

if(res != null)

{

this.WriteLine(res.ToString());

}

catch(Exception ex)

{

this.WriteLine(ex.Message);

}

this.TB.Text += this.Prompt;

this.TB.SelectionStart = this.TB.Text.Length;

this.TB.ScrollToEnd();

this.HistoryCommand.Append(rawCommand);

this.UpdateTextBasePosition();

}

private void _OnPreviewTextInput(object sender, TextCompositionEventArgs e)

{

if (this.TB.SelectionStart < this.TextBasePosition)

{

this.UpdateTextBasePosition();

e.Handled = true;

}

/// <summary>

/// 防止用户删除提示符

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void _OnPreviewKeyUp(object sender, KeyEventArgs e)

{

int index = this.TB.SelectionStart;

if (e.Key == Key.Left && index < this.TextBasePosition)

{

this.TB.SelectionStart = this.TextBasePosition;

this.TB.SelectionLength = 0;

e.Handled = true;

}

if (e.Key == Key.Back && index < this.TextBasePosition)

{

//recover

this.TB.SelectionStart = 0;

this.TB.SelectionLength = this.TextBasePosition - 1;

this.TB.SelectedText = this.HistoryText;

//set the cursor

this.TB.SelectionStart = this.TextBasePosition;

this.TB.SelectionLength = 0;

e.Handled = true;

}

private void _OnKeyUp(object sender, KeyEventArgs e)

{

switch (e.Key)

{

case Key.Up: // Command history next

break;

case Key.Down: // Command history previous

break;

case Key.Escape: // Command history exit

break;

default:

break;

}

public class TBTextWriter : TextWriter

{

public TBTextWriter(REPLTextBox tb)

{

this.TB = tb;

}

private REPLTextBox TB;

public override Encoding Encoding

{

get

{

return Encoding.UTF8;

}

public override void Write(string value)

{

this.TB.Write(value);

}

pythonnetLab/Test/REPLinWPF.cs at master · harperjohnarc/pythonnetLab · GitHub

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