private void UpdateOffsets(Graphics g)
{
myOffsets = new int[myPainters.Length];
int offset = 0;
for (int i = 0; i < myPainters.Length; i++)
{
IItemPainter painter = myPainters[i];
myOffsets[i] = offset;
int maxWidth = 0;
foreach (ListViewItem item in myItems)
{
Size size = painter.GetSize(item, g);
if (size.Width > maxWidth)
{
maxWidth = size.Width;
}
}
offset += maxWidth + SPACING;
}
myWidth = offset;
myOffsetsAreCorrect = true;
}
public void Draw(ListViewItem item, Graphics g, Rectangle rect)
{
if (!myOffsetsAreCorrect)
{
UpdateOffsets(g);
}
int startOffset = CalculateOffset(item);
for (int i = 0; i < myPainters.Length; i++)
{
IItemPainter painter = myPainters[i];
Size size = painter.GetSize(item, g);
int offset = myOffsets[i] + startOffset;
int endOffset = i == myPainters.Length - 1 ? rect.Width : myOffsets[i + 1];
switch (myAlignments[i])
{
case ColumnAlignment.Right:
offset += (endOffset - offset) - size.Width;
break;
case ColumnAlignment.Center:
offset += ((endOffset - offset) - size.Width) / 2;
break;
}
painter.Draw(item, g, new Rectangle(offset, 0, endOffset - offset, 0));
}
}
public Size GetItemSize(ListViewItem item)
{
try
{
using (Graphics g = CreateGraphics())
{
return(myItemPainter.GetSize(item, g));
}
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine("CustomListView.GetItemSize failed : " + ex, "UI");
return(new Size(1, 1));
}
}
protected override void OnMeasureItem(MeasureItemEventArgs e)
{
try
{
if (myItemPainter != null)
{
Size size = myItemPainter.GetSize(Items[e.Index], e.Graphics);
e.ItemWidth = size.Width;
e.ItemHeight = size.Height;
}
else
{
base.OnMeasureItem(e);
}
}
catch (Exception ex)
{
System.Diagnostics.Trace.WriteLine("CustomListBox.MeasureItem failed : " + ex, "UI");
}
}
