/// ------------------------------------------------------------------------------------
public CheckBoxColumnHeaderHandler(DataGridViewColumn col)
{
Debug.Assert(col != null);
Debug.Assert(col is DataGridViewCheckBoxColumn);
Debug.Assert(col.DataGridView != null);
_col = col;
_owningGrid = col.DataGridView;
_owningGrid.HandleDestroyed += HandleHandleDestroyed;
_owningGrid.CellPainting += HandleHeaderCellPainting;
_owningGrid.CellMouseMove += HandleHeaderCellMouseMove;
_owningGrid.CellMouseClick += HandleHeaderCellMouseClick;
_owningGrid.CellContentClick += HandleDataCellCellContentClick;
_owningGrid.Scroll += HandleGridScroll;
_owningGrid.RowsAdded += HandleGridRowsAdded;
_owningGrid.RowsRemoved += HandleGridRowsRemoved;
if (!BetterGrid.CanPaintVisualStyle())
{
_szCheckBox = new Size(13, 13);
}
else
{
var element = VisualStyleElement.Button.CheckBox.CheckedNormal;
var renderer = new VisualStyleRenderer(element);
using (var g = _owningGrid.CreateGraphics())
_szCheckBox = renderer.GetPartSize(g, ThemeSizeType.True);
}
}
/// ------------------------------------------------------------------------------------
private void DrawMinimalistButton(Graphics g, Rectangle rc)
{
var element = GetVisualStyleComboButton();
rc = AdjustRectToDefaultComboButtonWidth(rc);
if (element != VisualStyleElement.ComboBox.DropDownButton.Normal &&
element != VisualStyleElement.ComboBox.DropDownButton.Disabled &&
BetterGrid.CanPaintVisualStyle(element))
{
var renderer = new VisualStyleRenderer(element);
renderer.DrawBackground(g, rc);
}
else
{
var pen = (element == VisualStyleElement.ComboBox.DropDownButton.Disabled ?
SystemPens.GrayText : SystemPens.WindowText);
var x = rc.X + (int)Math.Round((rc.Width - 7) / 2f, MidpointRounding.AwayFromZero);
var y = rc.Y + (int)Math.Round((rc.Height - 4) / 2f, MidpointRounding.AwayFromZero);
g.DrawLine(pen, x, y, x + 6, y++);
g.DrawLine(pen, x + 1, y, x + 5, y++);
g.DrawLine(pen, x + 2, y, x + 4, y);
g.DrawLine(pen, x + 3, y, x + 3, y + 1);
return;
}
}
/// ------------------------------------------------------------------------------------
private bool DrawVisualStyledButton(PushButtonColumn.ButtonType buttonStyle,
IDeviceContext g, Rectangle rcbtn)
{
VisualStyleElement element = (buttonStyle == PushButtonColumn.ButtonType.VisualStyleCombo ?
GetVisualStyleComboButton() : GetVisualStylePushButton());
if (!BetterGrid.CanPaintVisualStyle(element))
{
return(false);
}
VisualStyleRenderer renderer = new VisualStyleRenderer(element);
rcbtn = AdjustRectToDefaultComboButtonWidth(rcbtn);
renderer.DrawBackground(g, rcbtn);
return(true);
}
/// ------------------------------------------------------------------------------------
private void HandleHeaderCellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
if (e.RowIndex >= 0 && e.ColumnIndex != _col.Index)
{
return;
}
var rcCell = _owningGrid.GetCellDisplayRectangle(_col.Index, -1, false);
if (rcCell.IsEmpty)
{
return;
}
// At this point, we know at least part of the header cell is visible, therefore,
// force the rectangle's width to that of the column's.
rcCell.X = rcCell.Right - _col.Width;
// Subtract one so as not to include the left border in the width.
rcCell.Width = _col.Width - 1;
int dx = (int)Math.Floor((rcCell.Width - _szCheckBox.Width) / 2f);
int dy = (int)Math.Floor((rcCell.Height - _szCheckBox.Height) / 2f);
var rc = new Rectangle(rcCell.X + dx, rcCell.Y + dy, _szCheckBox.Width, _szCheckBox.Height);
if (BetterGrid.CanPaintVisualStyle())
{
DrawVisualStyleCheckBox(e.Graphics, rc);
}
else
{
var state = ButtonState.Checked;
if (HeadersCheckState == CheckState.Unchecked)
{
state = ButtonState.Normal;
}
else if (HeadersCheckState == CheckState.Indeterminate)
{
state |= ButtonState.Inactive;
}
ControlPaint.DrawCheckBox(e.Graphics, rc, state | ButtonState.Flat);
}
}