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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Media.TextFormatting;
using Tango.Scripting.Core;
using Tango.Scripting.Editors.Document;
using Tango.Scripting.Editors.Rendering;
using Tango.Scripting.Editors.Utils;
namespace Tango.Scripting.Editors.Editing
{
public class BreakPointMargin : AbstractMargin, IWeakEventListener
{
private TextArea textArea;
private int maxLineNumberLength = 1;
private BitmapSource _arrowBitmap;
private ScriptEditor _editor;
public ObservableCollection<BreakPoint> BreakPoints { get; set; }
public Brush Background
{
get { return (Brush)GetValue(BackgroundProperty); }
set { SetValue(BackgroundProperty, value); }
}
public static readonly DependencyProperty BackgroundProperty =
DependencyProperty.Register("Background", typeof(Brush), typeof(BreakPointMargin), new PropertyMetadata(new SolidColorBrush(Color.FromRgb(50, 50, 50))));
public Brush Foreground
{
get { return (Brush)GetValue(ForegroundProperty); }
set { SetValue(ForegroundProperty, value); }
}
public static readonly DependencyProperty ForegroundProperty =
DependencyProperty.Register("Foreground", typeof(Brush), typeof(BreakPointMargin), new PropertyMetadata(Brushes.Red));
static BreakPointMargin()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(BreakPointMargin),
new FrameworkPropertyMetadata(typeof(BreakPointMargin)));
}
public BreakPointMargin(ScriptEditor editor)
{
_editor = editor;
BreakPoints = new ObservableCollection<BreakPoint>();
BreakPoints.CollectionChanged += BreakPoints_CollectionChanged;
RenderOptions.SetEdgeMode(this, EdgeMode.Unspecified);
_arrowBitmap = new BitmapImage(new Uri($"pack://application:,,,/Tango.Scripting.Editors;component/Images/break_point_arrow.png", UriKind.Absolute));
}
private void BreakPoints_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
InvalidateVisual();
}
protected override Size MeasureOverride(Size availableSize)
{
return new Size(20, 0);
}
protected override void OnRender(DrawingContext drawingContext)
{
TextView textView = this.TextView;
Size renderSize = this.RenderSize;
if (textView != null && textView.VisualLinesValid)
{
drawingContext.DrawRectangle(Background, new Pen(Background, 1), new Rect(0, 0, ActualWidth, ActualHeight));
var foreground = Foreground;
foreach (VisualLine line in textView.VisualLines)
{
int lineNumber = line.FirstDocumentLine.LineNumber;
BreakPoint b = BreakPoints.FirstOrDefault(x => x.LineNumber == lineNumber);
if (b != null)
{
double y = line.GetTextLineVisualYPosition(line.TextLines[0], VisualYPosition.TextTop);
drawingContext.DrawEllipse(Foreground, new Pen(Brushes.Gainsboro, 1), new Point(10, y - textView.VerticalOffset + 8), 6, 6);
if (b.IsActive)
{
drawingContext.DrawImage(_arrowBitmap, new Rect(6, y - textView.VerticalOffset + 2.5, 8.5, 10));
}
}
}
}
}
protected override void OnTextViewChanged(TextView oldTextView, TextView newTextView)
{
if (oldTextView != null)
{
oldTextView.VisualLinesChanged -= TextViewVisualLinesChanged;
}
base.OnTextViewChanged(oldTextView, newTextView);
if (newTextView != null)
{
newTextView.VisualLinesChanged += TextViewVisualLinesChanged;
// find the text area belonging to the new text view
textArea = newTextView.Services.GetService(typeof(TextArea)) as TextArea;
}
else
{
textArea = null;
}
InvalidateVisual();
}
protected override void OnDocumentChanged(TextDocument oldDocument, TextDocument newDocument)
{
if (oldDocument != null)
{
PropertyChangedEventManager.RemoveListener(oldDocument, this, "LineCount");
}
base.OnDocumentChanged(oldDocument, newDocument);
if (newDocument != null)
{
PropertyChangedEventManager.AddListener(newDocument, this, "LineCount");
}
OnDocumentLineCountChanged();
}
protected virtual bool ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
if (managerType == typeof(PropertyChangedEventManager))
{
OnDocumentLineCountChanged();
return true;
}
return false;
}
bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
{
return ReceiveWeakEvent(managerType, sender, e);
}
private void OnDocumentLineCountChanged()
{
int documentLineCount = Document != null ? Document.LineCount : 1;
int newLength = documentLineCount.ToString(CultureInfo.CurrentCulture).Length;
foreach (var breakPoint in BreakPoints.ToList())
{
if (breakPoint.LineNumber > documentLineCount)
{
BreakPoints.Remove(breakPoint);
}
else
{
try
{
var line = Document.GetLineByNumber(breakPoint.LineNumber);
if (line != null)
{
String lineText = Document.GetText(line.Offset, line.Length);
if (!IsBreakPointValid(lineText))
{
BreakPoints.Remove(breakPoint);
}
}
}
catch { }
}
}
// The margin looks too small when there is only one digit, so always reserve space for
// at least two digits
if (newLength < 2)
newLength = 2;
if (newLength != maxLineNumberLength)
{
maxLineNumberLength = newLength;
InvalidateMeasure();
}
}
private void TextViewVisualLinesChanged(object sender, EventArgs e)
{
InvalidateVisual();
}
protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters)
{
// accept clicks even when clicking on the background
return new PointHitTestResult(this, hitTestParameters.HitPoint);
}
private VisualLine GetLineNumberByMousePosition(MouseEventArgs e)
{
Point pos = e.GetPosition(TextView);
pos.X = 0;
pos.Y += TextView.VerticalOffset;
VisualLine vl = TextView.GetVisualLineFromVisualTop(pos.Y);
return vl;
}
private bool IsBreakPointValid(String lineText)
{
if (lineText.EndsWith(";") && !lineText.StartsWith("using"))
{
return true;
}
return false;
}
protected override void OnPreviewMouseMove(MouseEventArgs e)
{
base.OnPreviewMouseMove(e);
if (_editor.DisableBreakPoints)
{
Cursor = Cursors.No;
}
else
{
Cursor = Cursors.Arrow;
}
}
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
if (_editor.DisableBreakPoints)
{
return;
}
try
{
if (!e.Handled && TextView != null && textArea != null)
{
e.Handled = true;
textArea.Focus();
var visualLine = GetLineNumberByMousePosition(e);
int? lineNumber = visualLine != null ? (int?)visualLine.FirstDocumentLine.LineNumber : null;
if (lineNumber != null)
{
var breakPoint = BreakPoints.FirstOrDefault(x => x.LineNumber == lineNumber.Value);
if (breakPoint != null)
{
BreakPoints.Remove(breakPoint);
}
else
{
var lineText = Document.GetText(visualLine.FirstDocumentLine.Offset, visualLine.FirstDocumentLine.Length).Trim();
if (IsBreakPointValid(lineText))
{
BreakPoint newBreakPoint = new BreakPoint();
newBreakPoint.LineNumber = lineNumber.Value;
BreakPoints.Add(newBreakPoint);
}
}
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
}
}
}
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