DataGridView添加CheckBoxColumnHeader(1)
DataGridView中没有中有checkboxcolumn,但是该column不是checkbox的列头,这让人很郁闷,关于这个问题有3种解决方法,这里介绍一种比较暴力的方法,手画checkboxcolumnheader.
View Code
#region
datagridview列头加checkbox
public
class
DatagridViewCheckBoxHeaderCell : DataGridViewColumnHeaderCell
{
Point checkBoxLocation;
Size checkBoxSize;
bool
_checked
=
false
;
Point _cellLocation
=
new
Point();
System.Windows.Forms.VisualStyles.CheckBoxState _cbState
=
System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal;
public
event
CheckBoxClickedHandler OnCheckBoxClicked;
public
DatagridViewCheckBoxHeaderCell()
{
}
public
bool
Checked
{
get
{
return
_checked; }
set
{
_checked
=
value;
//
OnCheckBoxClicked(_checked);
this
.DataGridView.InvalidateCell(
this
);
}
}
protected
override
void
Paint(System.Drawing.Graphics graphics,
System.Drawing.Rectangle clipBounds,
System.Drawing.Rectangle cellBounds,
int
rowIndex,
DataGridViewElementStates dataGridViewElementState,
object
value,
object
formattedValue,
string
errorText,
DataGridViewCellStyle cellStyle,
DataGridViewAdvancedBorderStyle advancedBorderStyle,
DataGridViewPaintParts paintParts)
{
base
.Paint(graphics, clipBounds, cellBounds, rowIndex,
dataGridViewElementState, value,
""
, errorText, cellStyle,
advancedBorderStyle, paintParts);
Point p
=
new
Point();
Size s
=
CheckBoxRenderer.GetGlyphSize(graphics,
System.Windows.Forms.VisualStyles.CheckBoxState.UncheckedNormal);
p.X
=
cellBounds.Location.X
+
(cellBounds.Width
/
2
)
-
(s.Width
/
2
);
p.Y
=
cellBounds.Location.Y
+
(cellBounds.Height
/
2
)
-
(s.Height
/
2
);
_cellLocation
=
cellBounds.Location;
checkBoxLocation
=
p;
checkBoxSize
=
s;
if
(_checked)
_cbState
=
System.Windows.Forms.VisualStyles.
CheckBoxState.CheckedNormal;
else
_cbState
=
System.Windows.Forms.VisualStyles.
CheckBoxState.UncheckedNormal;
CheckBoxRenderer.DrawCheckBox
(graphics, checkBoxLocation, _cbState);
}
protected
override
void
OnMouseClick(DataGridViewCellMouseEventArgs e)
{
Point p
=
new
Point(e.X
+
_cellLocation.X, e.Y
+
_cellLocation.Y);
if
(p.X
>=
checkBoxLocation.X
&&
p.X
<=
checkBoxLocation.X
+
checkBoxSize.Width
&&
p.Y
>=
checkBoxLocation.Y
&&
p.Y
<=
checkBoxLocation.Y
+
checkBoxSize.Height)
{
_checked
=
!
_checked;
if
(OnCheckBoxClicked
!=
null
)
{
OnCheckBoxClicked(_checked);
this
.DataGridView.InvalidateCell(
this
);
}
}
base
.OnMouseClick(e);
}
}
public
delegate
void
CheckBoxClickedHandler(
bool
State);
public
class
DataGridViewCheckBoxHeaderCellEventArgs : EventArgs
{
bool
_bChecked;
public
DataGridViewCheckBoxHeaderCellEventArgs(
bool
bChecked)
{
_bChecked
=
bChecked;
}
public
bool
Checked
{
get
{
return
_bChecked; }
}
}
#endregion
//
窗体运行时更新DataGridView
public
void
Form_Load()
{
DatagridViewCheckBoxHeaderCell dgvcCheckBox
=
new
DatagridViewCheckBoxHeaderCell();
dgvcCheckBox.OnCheckBoxOnClicked
+=
new
CheckBoxClickedHandler(HeaderCellChecked);
//
注册列头的checkbox选中事件
dgvDataGridVew.Columns[
"
Checked
"
].HeaderCell
=
dgvcCheckBox;
//
设置checkbox列列头cell为我们画的那个checkbox列头
}
public
void
HeaderCellChecked(
object
sender, DataGridViewCheckBoxHeaderCellEventArgs e)
{
//
代码
}