/// <summary>
/// 绘制加载状态。
/// </summary>
/// <param name="e"></param>
public virtual void DrawLoading(TreeListRenderEventArgs e)
{
if (string.IsNullOrEmpty(e.TreeList.LoadingText))
{
return;
}
var color = Color.FromArgb(30, 220, 220, 220);
using (var brush = new SolidBrush(color))
{
e.Graphics.FillRectangle(brush, e.Bounds);
}
var size = TextRenderer.MeasureText(e.TreeList.LoadingText, e.TreeList.Font);
var rect = e.Bounds.Middle(size.Width + 80, size.Height + 40);
e.Graphics.FillRectangle(SystemBrushes.Window, rect);
e.Graphics.DrawRectangle(Pens.LightGray, rect);
var sf = new StringFormat
{
LineAlignment = StringAlignment.Center,
Alignment = StringAlignment.Center
};
e.Graphics.DrawString(e.TreeList.LoadingText, e.TreeList.Font, Brushes.Gray, rect, sf);
}
public virtual void DrawNoneItem(TreeListRenderEventArgs e)
{
var sf = new StringFormat();
sf.LineAlignment = StringAlignment.Center;
sf.Alignment = StringAlignment.Center;
var rect = e.Bounds;
e.Graphics.DrawString(e.TreeList.NoneItemText, e.TreeList.Font, Brushes.LightGray, rect, sf);
}
