它仍然显示,但只是以浅灰色显示,这取决于您的屏幕和当前设置,可能近乎不可见!
覆盖OnDrawNode事件。因此,您需要创建一个新类(称之为“SpecialTreeView”),并从Microsoft的TreeView
继承,如class SpecialTreeView:TreeView
。然后添加以下事件覆盖:
protected override void OnDrawNode(DrawTreeNodeEventArgs e)
{
TreeNodeStates treeState = e.State;
Font treeFont = e.Node.NodeFont ?? e.Node.TreeView.Font;
Color foreColor = e.Node.ForeColor;
string strDeselectedColor = @"#6B6E77", strSelectedColor = @"#94C7FC";
Color selectedColor = System.Drawing.ColorTranslator.FromHtml(strSelectedColor);
Color deselectedColor = System.Drawing.ColorTranslator.FromHtml(strDeselectedColor);
SolidBrush selectedTreeBrush = new SolidBrush(selectedColor);
SolidBrush deselectedTreeBrush = new SolidBrush(deselectedColor);
if (foreColor == Color.Empty)
foreColor = e.Node.TreeView.ForeColor;
if (e.Node == e.Node.TreeView.SelectedNode)
{
if (this.Focused)
{
foreColor = SystemColors.HighlightText;
e.Graphics.FillRectangle(selectedTreeBrush, e.Bounds);
ControlPaint.DrawFocusRectangle(e.Graphics, e.Bounds, foreColor, SystemColors.Highlight);
TextRenderer.DrawText(e.Graphics, e.Node.Text, treeFont, e.Bounds,
foreColor, TextFormatFlags.GlyphOverhangPadding);
}
else
{
foreColor = SystemColors.HighlightText;
e.Graphics.FillRectangle(deselectedTreeBrush, e.Bounds);
ControlPaint.DrawFocusRectangle(e.Graphics, e.Bounds, foreColor, SystemColors.Highlight);
TextRenderer.DrawText(e.Graphics, e.Node.Text, treeFont, e.Bounds,
foreColor, TextFormatFlags.GlyphOverhangPadding);
}
}
else
{
if ((e.State & TreeNodeStates.Hot) == TreeNodeStates.Hot)
{
e.Graphics.FillRectangle(SystemBrushes.Window, e.Bounds);
TextRenderer.DrawText(e.Graphics, e.Node.Text, hotFont, e.Bounds,
System.Drawing.Color.Black, TextFormatFlags.GlyphOverhangPadding);
}
else
{
e.Graphics.FillRectangle(SystemBrushes.Window, e.Bounds);
TextRenderer.DrawText(e.Graphics, e.Node.Text, treeFont, e.Bounds,
foreColor, TextFormatFlags.GlyphOverhangPadding);
}
}
}
编译代码,您应该在设计器的工具箱中看到“SpecialTreeView”。使用相同的名称将您的TreeView替换为这个新的控件,唯一不同的是选择颜色。 当选中时,它将是selectedColor
,当未选中时则是deselectedColor
。
希望这可以帮助您。