private void DrawFooter(Graphics graphics)
{
if (!ShowFooter)
{
return;
}
var rect = _bound.FooterBound;
rect = rect.ReduceLeft(GetOffsetLeft());
var e = new TreeListItemRenderEventArgs(Footer, graphics, rect)
{
DrawState = DrawState.Normal
};
Renderer.DrawFooterBackground(e);
if (Footer == null)
{
return;
}
e.Graphics.KeepClip(_bound.FooterBound, () =>
{
DrawCells(e.Graphics, e.Item.Cells, e.Bounds, e.DrawState);
});
}
/// <summary>
/// 绘制页脚。
/// </summary>
/// <param name="e"></param>
public virtual void DrawFooterBackground(TreeListItemRenderEventArgs e)
{
using (var br = new LinearGradientBrush(e.Bounds, Color.FromArgb(250, 250, 250), Color.FromArgb(240, 240, 240), 90))
{
e.Graphics.FillRectangle(br, e.Bounds);
}
e.Graphics.DrawLine(Pens.LightGray, e.Bounds.X, e.Bounds.Y, e.Bounds.Right, e.Bounds.Y);
}
protected virtual Color GetItemBackgroundColor(TreeListItemRenderEventArgs e)
{
if (e.DrawState == DrawState.Selected)
{
return(e.Item.TreeList.Focused ? SystemColors.Highlight : SystemColors.ButtonFace);
}
else if (e.Item.BackgroundColor != Color.Empty)
{
return(e.Item.BackgroundColor);
}
else if (e.Alternate && e.Item.TreeList.AlternateBackColor != Color.Empty)
{
return(e.Item.TreeList.AlternateBackColor);
}
return(e.Item.TreeList.BackColor);
}
private void DrawItem(TreeListItemRenderEventArgs e, bool setClip = true)
{
e.Graphics.KeepClip(_bound.ItemBound, () =>
{
Renderer.DrawItem(e);
DrawCells(e.Graphics, e.Item.Cells, e.Bounds, e.DrawState);
}, setClip);
if (ShowRowNumber)
{
var e3 = new TreeListRowNumberRenderEventArgs(this, RowNumberIndex + e.Item.DataIndex, e.Graphics, new Rectangle(_bound.WorkBound.X, e.Bounds.Y, RowNumberWidth, e.Bounds.Height));
e.Graphics.KeepClip(_bound.RowNumberBound, () =>
{
e3.DrawState = e.DrawState;
DrawRowNumber(e3);
});
}
}
/// <summary>
/// 绘制 <see cref="TreeListItem"/> 的背景。
/// </summary>
/// <param name="e"></param>
protected virtual void DrawItemBackground(TreeListItemRenderEventArgs e)
{
//绘制背景图像
if (e.Item.TreeList.BackgroundImage != null)
{
e.Graphics.KeepClip(e.Bounds, () =>
{
var be = new BackgroundRenderEventArgs(e.Item.TreeList, e.Graphics, e.Item.TreeList.GetBoundSet().ItemBound);
ThemeManager.BaseRenderer.DrawBackground(be);
});
}
var backColor = GetItemBackgroundColor(e);
if (!backColor.IsEmpty)
{
using (var brush = new SolidBrush(backColor))
{
e.Graphics.FillRectangle(brush, e.Bounds);
}
}
}
/// <summary>
/// 绘制 <see cref="TreeList"/> 中的行。
/// </summary>
/// <param name="e"></param>
public virtual void DrawItem(TreeListItemRenderEventArgs e)
{
DrawItemBackground(e);
}
/// <summary>
/// 处理当前鼠标经过的对象。
/// </summary>
/// <param name="info"></param>
/// <param name="drawState"></param>
private void ProcessHitTestInfo(TreeListHitTestInfo info, DrawState drawState)
{
if (info.Bounds.IsEmpty)
{
return;
}
switch (info.HitTestType)
{
case TreeListHitTestType.Column:
var column = (TreeListColumn)info.Element;
using (var graphics = CreateGraphics())
{
var drawArgs = new TreeListColumnRenderEventArgs(column, graphics, info.Bounds)
{
DrawState = drawState
};
graphics.KeepClip(_bound.ColumnBound, () => Renderer.DrawColumnHeader(drawArgs));
}
break;
case TreeListHitTestType.ColumnSize:
Cursor = Cursors.VSplit;
break;
case TreeListHitTestType.Cell:
if (info.Owner != null)
{
ProcessHitTestInfo(info.Owner, drawState);
}
var cell = (TreeListCell)info.Element;
var rect = GetCellTextRectangle(cell, info.Bounds);
ShowToolTip(cell, rect);
break;
case TreeListHitTestType.Item:
if (HandCursor)
{
Cursor = Cursors.Hand;
}
if (drawState == DrawState.Pressed || !HotTracking)
{
return;
}
var vitem = (VirtualTreeListItem)info.Element;
var item = (TreeListItem)vitem.Item;
if (item.Selected)
{
return;
}
using (var graphics = CreateGraphics())
{
var drawArgs = new TreeListItemRenderEventArgs(item, graphics, info.Bounds)
{
DrawState = drawState,
Alternate = vitem.Index % 2 != 0
};
DrawItem(drawArgs);
}
break;
}
}
