C# Ownerdrawn树视图（WinForms）
我有一个带有复选框的TreeView控件，它是完全由所有者绘制的（C# Ownerdrawn树视图（WinForms）,c#,winforms,treeview,custom-controls,ownerdrawn,C#,Winforms,Treeview,Custom Controls,Ownerdrawn,我有一个带有复选框的TreeView控件，它是完全由所有者绘制的（DrawMode=TreeView-DrawMode.OwnerDrawAll） 我试图做的是让所有者绘制复选框，这样它们就可以有一个灰色状态。我正在为此使用VisualStyleRenderer 当我必须将展开/折叠图示符和复选框正确放置在项目边界中时，问题就出现了，因为图示符和复选框的“命中测试区域”似乎都是未知的且不可更改的 有没有办法获取这些区域的边界，或者用自定义值替换默认值？我遇到了同样的问题。必须将图形偏移适当的量，
DrawMode=TreeView-DrawMode.OwnerDrawAllVisualStyleRenderer有没有办法获取这些区域的边界，或者用自定义值替换默认值？我遇到了同样的问题。必须将图形偏移适当的量，这是可以预测的 这里可能比您需要的更多，但这是我在日历控件旁边使用的自定义树的绘图：
private void TreeViewControl_DrawNode(Object sender, DrawTreeNodeEventArgs e)
{
//What might seem like strange positioning/offset is to ensure that our custom drawing falls in
// line with where the base drawing would appear. Otherwise, click handlers (hit tests) fail
// to register properly if our custom-drawn checkbox doesn't fall within the expected coordinates.
Int32 boxSize = 16;
Int32 offset = e.Node.Parent == null ? 3 : 21;
Rectangle bounds = new Rectangle(new Point(e.Bounds.X + offset, e.Bounds.Y + 1), new Size(boxSize, boxSize));
ControlPaint.DrawCheckBox(e.Graphics, bounds, e.Node.Checked ? ButtonState.Checked : ButtonState.Normal);
if (e.Node.Parent != null)
{
Color c = Color.Black;
String typeName = e.Node.Name.Remove(0, 4);
Object o = Enum.Parse(typeof(CalendarDataProvider.CalendarDataItemType), typeName);
if (o != null && (o is CalendarDataProvider.CalendarDataItemType))
c = CalendarDataProvider.GetItemTypeColor((CalendarDataProvider.CalendarDataItemType)o);
bounds = new Rectangle(new Point(bounds.X + boxSize + 2, e.Bounds.Y + 1), new Size(13, 13));
using (SolidBrush b = new SolidBrush(c))
e.Graphics.FillRectangle(b, bounds);
e.Graphics.DrawRectangle(Pens.Black, bounds);
e.Graphics.DrawLine(Pens.Black, new Point(bounds.X + 1, bounds.Bottom + 1), new Point(bounds.Right + 1, bounds.Bottom + 1));
e.Graphics.DrawLine(Pens.Black, new Point(bounds.Right + 1, bounds.Y + 1), new Point(bounds.Right + 1, bounds.Bottom + 1));
}
Font font = new Font("Microsoft Sans Serif", 9f, e.Node.Parent == null ? FontStyle.Bold : FontStyle.Regular);
bounds = new Rectangle(new Point(bounds.X + boxSize + 2, e.Bounds.Y), new Size(e.Bounds.Width - offset - 2, boxSize));
e.Graphics.DrawString(e.Node.Text, font, Brushes.Black, bounds);
}
您好，谢谢您的回复！事实上，现在我在做你的代码。我想知道是否可以在运行时读取
boxSizeoffset