// Draw column header event.
// Draws column header manually to set theme.
private void HandleDrawColumnHeader(Object sender, DrawListViewColumnHeaderEventArgs e)
{
e.DrawDefault = false;
Graphics g = e.Graphics;
Rectangle b = e.Bounds;
Point localPoint = ListView.PointToClient(Control.MousePosition);
Color c = ListView.BackColor;
int bcU = c.R + 15;
int bcL1 = c.R + 9;
int bcL2 = c.R + 4;
int bU = c.R + 25;
int bL = c.R - 12;
if (b.Contains(localPoint))
{
if (NlmTreeListView.MouseButtons == MouseButtons.Left)
{
bcU -= 10;
bcL1 -= 10;
bcL2 -= 10;
bU -= 27;
bL += 17;
}
else
{
bcU += 10;
bcL1 += 10;
bcL2 += 10;
}
}
Color backColorUpper = Color.FromArgb(bcU, bcU, bcU);
Color backColorLower1 = Color.FromArgb(bcL1, bcL1, bcL1);
Color backColorLower2 = Color.FromArgb(bcL2, bcL2, bcL2);
Color borderUpper = Color.FromArgb(bU, bU, bU);
Color borderLower = Color.FromArgb(bL, bL, bL);
int topHeight = 12;
Rectangle topRect = new Rectangle(b.Left, b.Top, b.Width, topHeight);
RectangleF bottomRect = new RectangleF(b.Left, b.Top + topHeight, b.Width, b.Height - topHeight);
using (SolidBrush brush = new SolidBrush(backColorUpper))
{
g.FillRectangle(brush, topRect);
}
using (LinearGradientBrush brush = new LinearGradientBrush(
bottomRect,
backColorLower1,
backColorLower2,
LinearGradientMode.Vertical))
{
g.FillRectangle(brush, bottomRect);
}
ControlPaint.DrawBorder(g, b,
borderUpper, 1, ButtonBorderStyle.Solid,
borderUpper, 1, ButtonBorderStyle.Solid,
borderLower, 1, ButtonBorderStyle.Solid,
borderLower, 1, ButtonBorderStyle.Solid);
if (e.ColumnIndex == ListView.NlmColumns.NameColumn.Index)
{
TextRenderer.DrawText(g, e.Header.Text, ListView.Font, new Rectangle(b.Left, b.Top, b.Width, b.Height - 2), ListView.ForeColor, TextFormatFlags.VerticalCenter | TextFormatFlags.Left);
}
else
{
TextRenderer.DrawText(g, e.Header.Text, ListView.Font, new Rectangle(b.Left, b.Top, b.Width, b.Height - 2), ListView.ForeColor);
}
}