internal WriteableBitmap GetColumSnapshot(int iColumn)
{
GB_GridView.CellPaintEventArgs e = new GB_GridView.CellPaintEventArgs();
e.Bounds = new GDI.Rectangle(0, 0, (int)Columns[iColumn].Width, (int)ActualHeight);
e.ColumnIndex = iColumn;
WriteableBitmap temp = new WriteableBitmap(e.Bounds.Width, e.Bounds.Height, 96.0, 96.0, PixelFormats.Pbgra32, null);
GDI.Bitmap tempbmp = new GDI.Bitmap(temp.PixelWidth, temp.PixelHeight,
temp.BackBufferStride, GDI.Imaging.PixelFormat.Format32bppArgb,
temp.BackBuffer);
using (GDI.Graphics gg = GDI.Graphics.FromImage(tempbmp))
{
e.Graphics = gg;
e.RowIndex = -1;
e.States = GB_GridView.GridViewElementStates.Selected;
e.Value = Columns[iColumn].Header;
DefaultPaintCell(e);
}
tempbmp.Dispose();
temp.Lock();
temp.AddDirtyRect(new Int32Rect(0, 0, temp.PixelWidth, temp.PixelHeight));
temp.Unlock();
return(temp);
}
void DefaultPaintCell(GB_GridView.CellPaintEventArgs e)
{
if (m_cellPaint != null)
{
m_cellPaint(this, e);
if (e.Handled)
{
return;
}
}
GDI.Brush brush = m_background;
if (e.ColumnIndex == m_mouseColumn)
{
brush = m_hoverbackground;
}
e.Graphics.FillRectangle(brush, e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height - 1);
//e.Graphics.DrawRectangle(System.Drawing.Pens.Black, e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height - 1);
// 判断下有没有SortGraph
System.Windows.Forms.SortOrder so = GetColumnSortGraph(e.ColumnIndex);
if (so != System.Windows.Forms.SortOrder.None)
{
GDI.Drawing2D.GraphicsPath path = new GDI.Drawing2D.GraphicsPath();
// 创建一个5*9的三角形
GDI.Point[] ptList = null;
if (so == System.Windows.Forms.SortOrder.Ascending) // 箭头朝上
{
ptList = new GDI.Point[] {
new GDI.Point(5, 0), new GDI.Point(0, 5), new GDI.Point(9, 5)
};
}
else
{
ptList = new GDI.Point[] {
new GDI.Point(4, 5), new GDI.Point(0, 0), new GDI.Point(9, 0)
};
}
GDI.Size offset = new GDI.Size(e.Bounds.Right - e.Bounds.Width / 2 - 5, e.Bounds.Top);
path.AddLines(new GDI.Point[] { GDI.Point.Add(ptList[0], offset), GDI.Point.Add(ptList[1], offset), GDI.Point.Add(ptList[2], offset) });
e.Graphics.FillPath(m_foreground, path);
path.Dispose();
}
if (e.Value != null)
{
GDI.StringFormat sf = new System.Drawing.StringFormat();
sf.Alignment = System.Drawing.StringAlignment.Center;
sf.FormatFlags = System.Drawing.StringFormatFlags.NoWrap;
sf.LineAlignment = System.Drawing.StringAlignment.Center;
sf.Trimming = System.Drawing.StringTrimming.EllipsisCharacter;
System.Drawing.Text.TextRenderingHint hint = e.Graphics.TextRenderingHint;
e.Graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SystemDefault;
e.Graphics.DrawString(e.Value.ToString(), Font, m_foreground, e.Bounds, sf);
e.Graphics.TextRenderingHint = hint;
}
}
/// <summary>
/// 重新绘制本区域内的内容
/// </summary>
/// <param name="rect">相对当前屏幕的坐标矩形</param>
public void paintArea(GDI.Rectangle rect)
{
if (rect.Height == 0 || rect.Width == 0)
{
return;
}
GDI.Drawing2D.GraphicsState state = g.Save();
g.SetClip(rect);
// 开始画图吧
double iOffsetX = rect.X;
int iColumn = GetCellColumn(ref iOffsetX);
if (iColumn == -1)
{
g.Restore(state);
return;
}
GB_GridView.CellPaintEventArgs e = new GB_GridView.CellPaintEventArgs();
g.FillRectangle(m_background, rect);
double iColumnWidth = rect.X - iOffsetX;
for (int j = iColumn; j < Columns.Count; ++j)
{
if (iColumnWidth > ActualWidth)
{
break; // 说明这一行画完了，开始画下一行吧
}
e.Bounds = new GDI.Rectangle((int)iColumnWidth, 0, (int)Columns[j].Width, m_bufferedBmp.PixelHeight);
iColumnWidth += Columns[j].Width;
e.ColumnIndex = j;
e.RowIndex = -1;
e.States = GB_GridView.GridViewElementStates.Visible;
e.Graphics = g;
e.Value = Columns[j].Header.ToString();
DefaultPaintCell(e);
}
g.Restore(state);
}
protected override void OnMouseLeave(MouseEventArgs e)
{
base.OnMouseLeave(e);
if (m_mouseColumn != -1)
{
int m_prev_mouseColumn = m_mouseColumn;
m_mouseColumn = -1;
GB_GridView.CellPaintEventArgs ce = new GB_GridView.CellPaintEventArgs();
int iPos = GetCellPosition(m_prev_mouseColumn);
ce.Bounds = new GDI.Rectangle(iPos, 0, (int)(Columns[m_prev_mouseColumn].Width), m_bufferedBmp.PixelHeight);
ce.ColumnIndex = m_prev_mouseColumn;
ce.Graphics = g;
ce.RowIndex = -1;
ce.States = GB_GridView.GridViewElementStates.Visible;
ce.Value = Columns[m_prev_mouseColumn].Header.ToString();
DefaultPaintCell(ce);
Invalidate(new Int32Rect(ce.Bounds.X, ce.Bounds.Y, ce.Bounds.Width, ce.Bounds.Height));
}
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
Point ptOwn = e.GetPosition(this);
double iOffsetX = ptOwn.X;
int iCol = GetCellColumn(ref iOffsetX);
//正在拖动列头
if (m_bdragingColumn)
{
// 改变列的宽度吧
int iWidthOffset = (int)(ptOwn.X - m_ptMouseDown.X);
if (m_tempWidth == 0)
{
m_tempWidth = Columns[m_needadjustcolumn].Width;
}
double iNewWidth = m_tempWidth + iWidthOffset;
if (iNewWidth <= 0)
{
iNewWidth = 3;
}
Columns[m_needadjustcolumn].Width = iNewWidth;
paintArea(new GDI.Rectangle((int)(ptOwn.X - iNewWidth), 0, (int)(m_bufferedBmp.PixelWidth - (int)ptOwn.X + iNewWidth), m_bufferedBmp.PixelHeight));
Invalidate(new Int32Rect((int)(ptOwn.X - iNewWidth), 0, (int)(m_bufferedBmp.PixelWidth - (int)ptOwn.X + iNewWidth), m_bufferedBmp.PixelHeight));
// 这里需要暴露出来，列宽已经改变了，需要更新ExtentWidth
if (OnExtentViewChanged != null)
{
OnExtentViewChanged();
}
if (GridView != null)
{
GridView.paintArea(new GDI.Rectangle(0, 0, (int)GridView.ActualWidth, (int)GridView.ActualHeight));
GridView.Invalidate();
}
return;
}
if (iCol != m_mouseColumn)
{
// 说明图形位置更新了，那就需要来替换了啊
// 高亮显示列吧
int m_prev_mouseColumn = m_mouseColumn;
m_mouseColumn = iCol;
// 先清除老的行
if (m_prev_mouseColumn != -1)
{
// 这里还要判断是不是上次的已经滚动走了
int iOldColPos = GetCellPosition(m_prev_mouseColumn);
GB_GridView.CellPaintEventArgs e1 = new GB_GridView.CellPaintEventArgs();
e1.Bounds = new GDI.Rectangle(iOldColPos, 0, (int)Columns[m_prev_mouseColumn].Width, m_bufferedBmp.PixelHeight);
e1.ColumnIndex = m_prev_mouseColumn;
e1.RowIndex = -1;
e1.Graphics = g;
e1.Value = Columns[m_prev_mouseColumn].Header.ToString();
DefaultPaintCell(e1);
Invalidate(new Int32Rect(e1.Bounds.X, e1.Bounds.Y, e1.Bounds.Width, e1.Bounds.Height));
}
// 如果鼠标已经换到别的列，则再画新列
if (m_mouseColumn != m_prev_mouseColumn && m_mouseColumn != -1)
{
GB_GridView.CellPaintEventArgs e1 = new GB_GridView.CellPaintEventArgs();
e1.Bounds = new GDI.Rectangle((int)(ptOwn.X - iOffsetX), 0, (int)Columns[m_mouseColumn].Width, m_bufferedBmp.PixelHeight);
e1.ColumnIndex = m_mouseColumn;
e1.RowIndex = -1;
e1.Value = Columns[m_mouseColumn].Header.ToString();
e1.Graphics = g;
DefaultPaintCell(e1);
Invalidate(new Int32Rect(e1.Bounds.X, e1.Bounds.Y, e1.Bounds.Width, e1.Bounds.Height));
}
}
// 这里在列上面，所以得判断光标是不是在两个列之间边缘，这种情况下要允许拖动列大小
if (iCol != -1)
{
if (iOffsetX < 3 || Columns[iCol].Width - iOffsetX < 3)
{
//这里光标要变化
Cursor = Cursors.SizeWE;
}
else
{
Cursor = Cursors.Arrow;
}
}
else
{
Cursor = Cursors.Arrow;
}
}
