/// <summary>
/// 绘制行
/// </summary>
public void Draw(TextBoxControl editor, Graphics g, Font f, Point ptPos)
{
Point ptTemp = ptPos;
RectangleF rcClip = g.ClipBounds;
// 绘制行号
//_nLineNumber = editor.LineCount;
if (editor.ShowLineNumber && (ptTemp.Y + editor.FontHeight > rcClip.Top && ptTemp.Y < rcClip.Bottom && ptTemp.X < rcClip.Right))
{
g.ResetClip();
int numWidth = editor.DrawHelper.MeasureStringWidth(g, _nLineNumber.ToString(), f);
Point ptNum = new Point(editor.Padding.Left + editor.GetBarWidth() - editor.Margin.Right - numWidth, ptPos.Y);
editor.DrawHelper.DrawString(g, _nLineNumber.ToString(), f, editor.LineNumberColor, ptNum);
g.SetClip(rcClip);
}
// 绘制元素
foreach (Block seg in Blocks)
{
if (ptTemp.Y + editor.FontHeight > rcClip.Top && ptTemp.Y < rcClip.Bottom && ptTemp.X < rcClip.Right)
{
seg.Draw(editor, g, f, ref ptTemp, _nLineNumber);
}
}
}
/// <summary>
/// 绘制
/// </summary>
public void Draw(TextBoxControl editor, Graphics g, Font f, ref Point ptTemp, int lineNumber)
{
TextLocation start = editor.SelectionManager.SelectionStart;
TextLocation end = editor.SelectionManager.SelectionEnd;
// 若未被选中的状态(起始位置等于结束位置时)，则直接按照原来的逻辑进行计算
if (start.X == end.X && start.Y == end.Y)
{
if (BlockType == BlockType.Space)
{
ptTemp.X += editor.SpaceWidth;
}
else if (BlockType == BlockType.Tab)
{
ptTemp.X += editor.SpaceWidth * Length;
}
else
{
int iWidth = editor.DrawHelper.MeasureStringWidth(g, Text, f);
editor.DrawHelper.DrawString(g, Text, f, Color, ptTemp);
ptTemp.X += iWidth;
}
return;
}
// 是否被选中
bool isSelected = false;
// 绘制的起始位置
int startPos = -1;
// 绘制的结束位置
int endPos = -1;
// 计算元素中选中部分和未选中部分
// 若元素的类型为空格或者是Tab键时，计算它们所占的宽度
int wordWidth = 0;
if (BlockType == BlockType.Space)
{
wordWidth = editor.SpaceWidth;
}
else if (BlockType == BlockType.Tab)
{
wordWidth = editor.SpaceWidth * Length;
}
else
{
wordWidth = editor.DrawHelper.MeasureStringWidth(g, Text, f);
}
// 计算开始节点和结束节点坐标的位置
int startColLocation = editor.CalColumnLocation(start.Y, start.X)
+ editor.Padding.Left
+ editor.Margin.Left
+ editor.GetBarWidth()
- editor.HorizontalScroll.Value;
int endColLocation = editor.CalColumnLocation(end.Y, end.X)
+ editor.Padding.Left
+ editor.Margin.Left
+ editor.GetBarWidth()
- editor.HorizontalScroll.Value;
if (start.Y == end.Y && start.Y == lineNumber)
{
int minX = startColLocation > endColLocation ? endColLocation : startColLocation;
int maxX = startColLocation > endColLocation ? startColLocation : endColLocation;
// 元素在选中范围内
if (minX <= ptTemp.X && ptTemp.X + wordWidth <= maxX)
{
isSelected = true;
}
// 元素与选中范围左侧有交集
else if (ptTemp.X < minX && minX < ptTemp.X + wordWidth && ptTemp.X + wordWidth <= maxX)
{
isSelected = true;
startPos = minX;
endPos = ptTemp.X + wordWidth;
}
// 元素与选中范围的右侧有交集
else if (ptTemp.X >= minX && ptTemp.X < maxX && ptTemp.X + wordWidth > maxX)
{
isSelected = true;
startPos = ptTemp.X;
endPos = maxX;
}
// 选中范围在元素中
else if (ptTemp.X < minX && ptTemp.X + wordWidth > maxX)
{
isSelected = true;
startPos = minX;
endPos = maxX;
}
}
else
{
TextLocation minY = start.Y < end.Y ? start : end;
TextLocation maxY = start.Y < end.Y ? end : start;
int minYColLocation = start.Y < end.Y ? startColLocation : endColLocation;
int maxYColLocation = start.Y < end.Y ? endColLocation : startColLocation;
// 所在行在选择行之间时
if (minY.Y < lineNumber && lineNumber < maxY.Y)
{
isSelected = true;
}
// 所在行在首行
else if (minY.Y == lineNumber)
{
if (minYColLocation <= ptTemp.X)
{
isSelected = true;
}
else if (ptTemp.X <= minYColLocation && minYColLocation < ptTemp.X + wordWidth)
{
isSelected = true;
startPos = minYColLocation;
endPos = ptTemp.X + wordWidth;
}
}
// 所在行在尾行
else if (maxY.Y == lineNumber)
{
if (maxYColLocation >= ptTemp.X + wordWidth)
{
isSelected = true;
}
else if (ptTemp.X < maxYColLocation && maxYColLocation <= ptTemp.X + wordWidth)
{
isSelected = true;
startPos = ptTemp.X;
endPos = maxYColLocation;
}
}
}
Brush selectionBackgroundBrush = new SolidBrush(SystemColors.Highlight);
if (BlockType == BlockType.Space)
{
if (isSelected)
{
g.FillRectangle(selectionBackgroundBrush, new RectangleF(ptTemp.X, ptTemp.Y, editor.SpaceWidth, editor.FontHeight));
}
ptTemp.X += editor.SpaceWidth;
}
else if (BlockType == BlockType.Tab)
{
if (isSelected)
{
g.FillRectangle(selectionBackgroundBrush, new RectangleF(ptTemp.X, ptTemp.Y, editor.SpaceWidth * 4, editor.FontHeight));
}
ptTemp.X += editor.SpaceWidth * editor.TabIndent;
}
else
{
if (isSelected && startPos != -1 && endPos != -1)
{
StringBuilder leftWords = new StringBuilder();
StringBuilder middleWords = new StringBuilder();
StringBuilder rightWords = new StringBuilder();
int length = ptTemp.X;
for (int i = 0; i < Text.Length; i++)
{
int word = editor.DrawHelper.MeasureStringWidth(g, Text[i].ToString(), editor.Font);
// 小于等于起始位置的文本设置为左部分文本（可有可无）
if (length + word <= startPos)
{
leftWords.Append(Text[i].ToString());
}
// 大于起始位置而小于等于结束位置的文本设置为中间文本（也就是选中部分）
else if (length + word > startPos && length + word <= endPos)
{
middleWords.Append(Text[i].ToString());
}
// 大于结束位置的文本定义为右侧文本（可有可无）
else if (length + word > endPos)
{
rightWords.Append(Text[i].ToString());
}
length += word;
}
// 按段去绘制一个元素，最多可分为三部分（非选中、选中、非选中）
editor.DrawHelper.DrawString(g, leftWords.ToString(), f, GetSegmentColor(editor), ptTemp);
int leftWidth = string.IsNullOrEmpty(leftWords.ToString()) ? 0 : editor.DrawHelper.MeasureStringWidth(g, leftWords.ToString(), editor.Font);
// 对高亮的绘制完全采用颜色填充的形式，而不采用直接设置背景色（直接设置背景色时，背景色和字体不是等宽的，而引起了背景色对前一个元素的尾字母产生了部分遮挡）
int middleWidth = string.IsNullOrEmpty(middleWords.ToString()) ? 0 : editor.DrawHelper.MeasureStringWidth(g, middleWords.ToString(), editor.Font);
g.FillRectangle(selectionBackgroundBrush, new RectangleF(ptTemp.X + leftWidth, ptTemp.Y, middleWidth, editor.FontHeight));
editor.DrawHelper.DrawString(g, middleWords.ToString(), f, editor.HighLightTextColor, new Point(ptTemp.X + leftWidth, ptTemp.Y));
editor.DrawHelper.DrawString(g, rightWords.ToString(), f, GetSegmentColor(editor), new Point(ptTemp.X + middleWidth + leftWidth, ptTemp.Y));
}
else if (isSelected && startPos == -1 && endPos == -1)
{
g.FillRectangle(selectionBackgroundBrush, new RectangleF(ptTemp.X, ptTemp.Y, wordWidth, editor.FontHeight));
editor.DrawHelper.DrawString(g, Text, f, editor.HighLightTextColor, ptTemp);
}
else
{
editor.DrawHelper.DrawString(g, Text, f, GetSegmentColor(editor), ptTemp);
}
ptTemp.X += wordWidth;
}
}
