private void DrawButton(Graphics g)
{
Rectangle rectangle = GetButtonAreaRectangle();
// g.FillRectangle(Brushes.Red, rectangle);
int arrowX = rectangle.Left + (rectangle.Width - rectangle.Width / 2);
int arrowY = rectangle.Y;
Point startPoint = new Point(arrowX, arrowY);
Point endPoint = new Point(arrowX, arrowY + rectangle.Height);
GraphicsPath arrowPath = DrawingTool.GetArrowPath(startPoint, endPoint, rectangle.Height);
using (Brush arrowBrush = new LinearGradientBrush(rectangle,
_theme.ArrowColorStart, _theme.ArrowColorEnd, 45))
{
g.FillPath(arrowBrush, arrowPath);
}
arrowPath.Dispose();
}
/// <summary>
/// 绘制表头
/// </summary>
/// <param name="g"></param>
/// <param name="bounds"></param>
/// <param name="headerText"></param>
private void DrawColumnHeader(Graphics g, Rectangle bounds, int columnIndex, string headerText)
{
DataGridViewColumnHeaderCell headerCell = _dataGridView.Columns[columnIndex].HeaderCell;
Rectangle contentBounds = bounds;
int contentBoundsX = contentBounds.X;
int contentBoundsY = contentBounds.Y;
int contentBoundsWidth = contentBounds.Width;
int contentBoundsHeight = contentBounds.Height;
#region 绘制背景
//绘制背景
using (LinearGradientBrush brush = new LinearGradientBrush(bounds, _theme.ColumnHeaderBackColorStart,
_theme.ColumnHeaderBackColorEnd, LinearGradientMode.Vertical))
{
g.FillRectangle(brush, bounds);
}
#endregion
#region 绘制文本
//绘制文本
if (String.IsNullOrEmpty(headerText) == false)
{
SizeF textSize = g.MeasureString(headerText, _font);
RectangleF textBounds = new RectangleF();
textBounds.X = contentBoundsX + 2;
textBounds.Y = bounds.Y + (bounds.Height - textSize.Height) / 2;
textBounds.Width = bounds.Width - 4;
textBounds.Height = textSize.Height;
Brush textBrush = new SolidBrush(_theme.ColumnHeaderTextColor);
g.DrawString(headerText, _dataGridView.Font, textBrush, textBounds, _columnHeaderTextStringFormat);
textBrush.Dispose();
}
#endregion
#region 在右侧绘制分隔线
Rectangle separatorBounds = new Rectangle();
separatorBounds.X = contentBoundsX + contentBoundsWidth - 1;
separatorBounds.Y = contentBoundsY;
separatorBounds.Width = 1;
separatorBounds.Height = contentBoundsHeight;
Brush separatorBrush = new LinearGradientBrush(separatorBounds,
_theme.ColumnHeaderSeparatorColorStart, _theme.ColumnHeaderSeparatorColorEnd, LinearGradientMode.Vertical);
g.FillRectangle(separatorBrush, separatorBounds);
separatorBrush.Dispose();
#endregion
#region 绘制排序箭头
//如果列排序了，在单元格中间靠顶部绘制，类似win7资源管理器中的列排序箭头绘制
if (headerCell.SortGlyphDirection != SortOrder.None)
{
int arrowLength = 5;
int arrowX = contentBoundsX + contentBoundsWidth / 2; //箭头中间的坐标
int arrowYOffset = 0; //绘制箭头的Y坐标
int arrowYStart = 0; //箭头本身的Y轴开始坐标
int arrowYEnd = 0; //箭头本身的Y轴结束坐标
switch (headerCell.SortGlyphDirection)
{
case SortOrder.Ascending: //▲
arrowYStart = arrowLength + arrowYOffset;
arrowYEnd = arrowYOffset;
break;
case SortOrder.Descending:
arrowYStart = arrowYOffset;
arrowYEnd = arrowLength + arrowYOffset;
break;
}
PointF startPoint = new PointF(arrowX, arrowYStart);
PointF endPoint = new PointF(arrowX, arrowYEnd);
GraphicsPath arrowPath = DrawingTool.GetArrowPath(startPoint, endPoint, arrowLength);
//用于填充的Rectangle必须是Graphics的实际呈现区域
Rectangle arrowBrushRectangle = new Rectangle(arrowX - arrowLength / 2, 0, arrowLength, arrowLength);
Brush arrowBrush = new LinearGradientBrush(arrowBrushRectangle,
_theme.ArrowColorStart, _theme.ArrowColorEnd, 45);
g.FillPath(arrowBrush, arrowPath);
arrowPath.Dispose();
arrowBrush.Dispose();
}
#endregion
}
