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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.ComponentModel;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.TextFormatting;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Rendering;
using ICSharpCode.AvalonEdit.Utils;
namespace ICSharpCode.AvalonEdit.Editing
{
/// <summary>
/// Margin showing line numbers.
/// </summary>
public class LineNumberMargin : AbstractMargin, IWeakEventListener
{
static LineNumberMargin()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(LineNumberMargin),
new FrameworkPropertyMetadata(typeof(LineNumberMargin)));
}
TextArea textArea;
Typeface typeface;
double emSize;
/// <inheritdoc/>
protected override Size MeasureOverride(Size availableSize)
{
typeface = this.CreateTypeface();
emSize = (double)GetValue(TextBlock.FontSizeProperty);
FormattedText text = TextFormatterFactory.CreateFormattedText(
this,
new string('9', maxLineNumberLength),
typeface,
emSize,
(Brush)GetValue(Control.ForegroundProperty)
);
return new Size(text.Width, 0);
}
/// <inheritdoc/>
protected override void OnRender(DrawingContext drawingContext)
{
TextView textView = this.TextView;
Size renderSize = this.RenderSize;
if (textView != null && textView.VisualLinesValid) {
var foreground = (Brush)GetValue(Control.ForegroundProperty);
foreach (VisualLine line in textView.VisualLines) {
int lineNumber = line.FirstDocumentLine.LineNumber;
FormattedText text = TextFormatterFactory.CreateFormattedText(
this,
lineNumber.ToString(CultureInfo.CurrentCulture),
typeface, emSize, foreground
);
double y = line.GetTextLineVisualYPosition(line.TextLines[0], VisualYPosition.TextTop);
drawingContext.DrawText(text, new Point(renderSize.Width - text.Width, y - textView.VerticalOffset));
}
}
}
/// <inheritdoc/>
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();
}
/// <inheritdoc/>
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();
}
/// <inheritdoc cref="IWeakEventListener.ReceiveWeakEvent"/>
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);
}
int maxLineNumberLength = 1;
void OnDocumentLineCountChanged()
{
int documentLineCount = Document != null ? Document.LineCount : 1;
int newLength = documentLineCount.ToString(CultureInfo.CurrentCulture).Length;
// 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();
}
}
void TextViewVisualLinesChanged(object sender, EventArgs e)
{
InvalidateVisual();
}
AnchorSegment selectionStart;
bool selecting;
/// <inheritdoc/>
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnMouseLeftButtonDown(e);
if (!e.Handled && TextView != null && textArea != null) {
e.Handled = true;
textArea.Focus();
SimpleSegment currentSeg = GetTextLineSegment(e);
if (currentSeg == SimpleSegment.Invalid)
return;
textArea.Caret.Offset = currentSeg.Offset + currentSeg.Length;
if (CaptureMouse()) {
selecting = true;
selectionStart = new AnchorSegment(Document, currentSeg.Offset, currentSeg.Length);
if ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift) {
SimpleSelection simpleSelection = textArea.Selection as SimpleSelection;
if (simpleSelection != null)
selectionStart = new AnchorSegment(Document, simpleSelection.SurroundingSegment);
}
textArea.Selection = Selection.Create(textArea, selectionStart);
if ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift) {
ExtendSelection(currentSeg);
}
}
}
}
SimpleSegment GetTextLineSegment(MouseEventArgs e)
{
Point pos = e.GetPosition(TextView);
pos.X = 0;
pos.Y += TextView.VerticalOffset;
VisualLine vl = TextView.GetVisualLineFromVisualTop(pos.Y);
if (vl == null)
return SimpleSegment.Invalid;
TextLine tl = vl.GetTextLineByVisualYPosition(pos.Y);
int visualStartColumn = vl.GetTextLineVisualStartColumn(tl);
int visualEndColumn = visualStartColumn + tl.Length;
int relStart = vl.FirstDocumentLine.Offset;
int startOffset = vl.GetRelativeOffset(visualStartColumn) + relStart;
int endOffset = vl.GetRelativeOffset(visualEndColumn) + relStart;
if (endOffset == vl.LastDocumentLine.Offset + vl.LastDocumentLine.Length)
endOffset += vl.LastDocumentLine.DelimiterLength;
return new SimpleSegment(startOffset, endOffset - startOffset);
}
void ExtendSelection(SimpleSegment currentSeg)
{
if (currentSeg.Offset < selectionStart.Offset) {
textArea.Caret.Offset = currentSeg.Offset;
textArea.Selection = Selection.Create(textArea, currentSeg.Offset, selectionStart.Offset + selectionStart.Length);
} else {
textArea.Caret.Offset = currentSeg.Offset + currentSeg.Length;
textArea.Selection = Selection.Create(textArea, selectionStart.Offset, currentSeg.Offset + currentSeg.Length);
}
}
/// <inheritdoc/>
protected override void OnMouseMove(MouseEventArgs e)
{
if (selecting && textArea != null && TextView != null) {
e.Handled = true;
SimpleSegment currentSeg = GetTextLineSegment(e);
if (currentSeg == SimpleSegment.Invalid)
return;
ExtendSelection(currentSeg);
}
base.OnMouseMove(e);
}
/// <inheritdoc/>
protected override void OnMouseLeftButtonUp(MouseButtonEventArgs e)
{
if (selecting) {
selecting = false;
selectionStart = null;
ReleaseMouseCapture();
e.Handled = true;
}
base.OnMouseLeftButtonUp(e);
}
/// <inheritdoc/>
protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters)
{
// accept clicks even when clicking on the background
return new PointHitTestResult(this, hitTestParameters.HitPoint);
}
}
}
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