//以上全部为一些简单的属性.
//构造函数
public TextArea(TextEditorControl motherTextEditorControl, TextAreaControl motherTextAreaControl)
{
this.motherTextAreaControl = motherTextAreaControl;
this.motherTextEditorControl = motherTextEditorControl;
caret = new Caret(this);//附加插入符.
selectionManager = new SelectionManager(Document);//附加选择管理器.
ResizeRedraw = true;
SetStyle(ControlStyles.DoubleBuffer, false);
SetStyle(ControlStyles.Opaque, false);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.Selectable, true);
textViewMargin = new TextViewMargin(this);//附加主要的文本区域。
gutterMargin = new GutterMargin(this);//附加装订线区域.
foldMargin = new FoldMargin(this);//附加折叠区域.
iconBarMargin = new IconBarMargin(this);//附加图标栏区域.
leftMargins.AddRange(new AbstractMargin[] { iconBarMargin, gutterMargin, foldMargin });
OptionsChanged();
textAreaClipboardHandler = new TextAreaClipboardHandler(this);//附加剪切办处理程序.
new TextAreaMouseHandler(this).Attach();
new TextAreaDragDropHandler().Attach(this);
bracketshemes.Add(new BracketHighlightingScheme('{', '}'));
bracketshemes.Add(new BracketHighlightingScheme('(', ')'));
bracketshemes.Add(new BracketHighlightingScheme('[', ']'));
caret.PositionChanged += new EventHandler(SearchMatchingBracket);
Document.TextContentChanged += new EventHandler(TextContentChanged);
Document.FoldingManager.FoldingsChanged += new EventHandler(DocumentFoldingsChanged);
}
protected override void OnPaint(PaintEventArgs e)
{
int currentXPos = 0;
int currentYPos = 0;
bool adjustScrollBars = false;
Graphics g = e.Graphics;
Rectangle clipRectangle = e.ClipRectangle;
if (updateMargin != null)
{
try
{
updateMargin.OnPaint(g, updateMargin.DrawingRectangle);
}
catch (Exception ex)
{
Console.WriteLine("Got exception : " + ex);
}
//clipRectangle.Intersect(updateMargin.DrawingRectangle);
}
if (clipRectangle.Width <= 0 || clipRectangle.Height <= 0)
{
return;
}
if (this.TextEditorProperties.UseAntiAliasedFont)
{
g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
}
else
{
g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
}
//以下开始画TextArea中的各个区域,同时制定各个区域的Rectangle大小.
foreach (AbstractMargin margin in leftMargins)
{
if (margin.IsVisible)
{
Rectangle marginRectangle = new Rectangle(currentXPos, currentYPos, margin.Size.Width, Height - currentYPos);
if (marginRectangle != margin.DrawingRectangle)
{
adjustScrollBars = true;
margin.DrawingRectangle = marginRectangle;
}
currentXPos += margin.DrawingRectangle.Width; //为画下一个margin提供正确的x坐标。
if (clipRectangle.IntersectsWith(marginRectangle))
{
marginRectangle.Intersect(clipRectangle);
if (!marginRectangle.IsEmpty)
{
try
{
margin.OnPaint(g, marginRectangle);
}
catch (Exception ex)
{
Console.WriteLine("Got exception : " + ex);
}
}
}
}
}
Rectangle textViewMarginArea = new Rectangle(currentXPos, currentYPos, Width - currentXPos, Height - currentYPos);
if (textViewMarginArea != textViewMargin.DrawingRectangle)
{
adjustScrollBars = true;
textViewMargin.DrawingRectangle = textViewMarginArea;
}
if (clipRectangle.IntersectsWith(textViewMarginArea))
{
textViewMarginArea.Intersect(clipRectangle);
if (!textViewMarginArea.IsEmpty)
{
try
{
textViewMargin.OnPaint(g, textViewMarginArea);
}
catch (Exception ex)
{
Console.WriteLine("Got exception : " + ex);
}
}
}
if (adjustScrollBars)
{
try
{
this.motherTextAreaControl.AdjustScrollBars(null, null);
}
catch (Exception) {}
}
try
{
Caret.UpdateCaretPosition();
}
catch (Exception) {}
base.OnPaint(e);
}