protected override void DrawItem(Graphics gr, VisibleItemInfo info)
{
if (PaintItem != null)
{
PaintItem(this, new PaintItemContentEventArgs {
Graphics = gr, Info = info
});
}
else
{
base.DrawItem(gr, info);
}
}
protected override void DrawItem(Graphics gr, VisibleItemInfo info)
{
if (PaintNode != null)
{
PaintNode(this, new PaintNodeContentEventArgs {
Graphics = gr, Info = info, Node = nodes[info.ItemIndex]
});
}
else
{
base.DrawItem(gr, info);
}
}
protected virtual void DrawItem(Graphics gr, VisibleItemInfo info)
{
DrawItemWhole(gr, info);
}
protected virtual void DrawItemHotTracking(Graphics gr, VisibleItemInfo info)
{
var c1 = HotTrackingColor;
var rect = info.TextAndIconRect;
if (FullItemSelect)
{
var cr = ClientRectMinusPaddings;
rect = new Rectangle(cr.Left, rect.Top, cr.Width - 1, rect.Height);
}
if (rect.Width > 0 && rect.Height > 0)
using (var pen = new Pen(c1))
gr.DrawRectangle(pen, rect);
}
public virtual void DrawSelection(Graphics gr, VisibleItemInfo info)
{
var c1 = Color.FromArgb(SelectionColor.A == 255 ? SelectionColorOpaque : SelectionColor.A, SelectionColor);
var c2 = Color.FromArgb(c1.A / 2, SelectionColor);
var rect = info.TextAndIconRect;
if (FullItemSelect)
{
var cr = ClientRectMinusPaddings;
rect = new Rectangle(cr.Left, rect.Top, cr.Width - 1, rect.Height);
}
if (rect.Width > 0 && rect.Height > 0)
using (var brush = new LinearGradientBrush(rect, c2, c1, LinearGradientMode.Vertical))
using (var pen = new Pen(c1))
{
gr.FillRectangle(brush, Rectangle.FromLTRB(rect.Left, rect.Top, rect.Right + 1, rect.Bottom + 1));
gr.DrawRectangle(pen, rect);
}
}
protected virtual VisibleItemInfo CalcVisibleItemInfo(Graphics gr, int itemIndex)
{
var result = new VisibleItemInfo();
result.Calc(this, itemIndex, gr);
return result;
}
/// <summary>
/// Draws Expand box, Check box and Icon of the Item
/// </summary>
public virtual void DrawItemIcons(Graphics gr, VisibleItemInfo info)
{
if (info.ExpandBoxType > 0)
{
var img = (Bitmap)(info.ExpandBoxType == 2 ? ImageEmptyExpand : (info.Expanded ? ImageCollapse : ImageExpand));
img.SetResolution(gr.DpiX, gr.DpiY);
gr.DrawImage(img, info.X_ExpandBox, info.Y + 1);
}
if (info.CheckBoxVisible)
{
var img = (Bitmap)(GetItemChecked(info.ItemIndex) ? ImageCheckBoxOn : ImageCheckBoxOff);
img.SetResolution(gr.DpiX, gr.DpiY);
gr.DrawImage(img, info.X_CheckBox, info.Y + 1);
}
if (ShowIcons && info.Icon != null)
{
var img = (Bitmap)info.Icon;
img.SetResolution(gr.DpiX, gr.DpiY);
gr.DrawImage(img, info.X_Icon, info.Y + 1);
}
}
public void DrawItemWhole(Graphics gr, VisibleItemInfo info)
{
DrawItemBackgound(gr, info);
if (lastDragAndDropEffect == null) //do not draw selection when drag&drop over the control
if (SelectedItemIndexes.Contains(info.ItemIndex))
DrawSelection(gr, info);
if (HotTracking && info.ItemIndex == currentHotTrackingIndex)
DrawItemHotTracking(gr, info);
DrawItemIcons(gr, info);
DrawItemContent(gr, info);
}
public virtual void DrawItemBackgound(Graphics gr, VisibleItemInfo info)
{
var backColor = info.BackColor;
if (backColor != Color.Empty)
using (var brush = new SolidBrush(backColor))
gr.FillRectangle(brush, info.TextAndIconRect);
}
public virtual void DrawItemContent(Graphics gr, VisibleItemInfo info)
{
using (var brush = new SolidBrush(info.ForeColor))
gr.DrawString(info.Text, Font, brush, info.X_Text, info.Y + 1);
}
protected virtual void OnMouseSelectItem(MouseEventArgs e, VisibleItemInfo item)
{
if (MultiSelect)
{
startMouseSelectArea = e.Location;
startMouseSelectArea.Offset(HorizontalScroll.Value, VerticalScroll.Value);
mouseCanSelectArea = item.X_EndText < e.Location.X || !AllowDragItems;
if (Control.ModifierKeys == Keys.Control)
{
if (SelectedItemIndexes.Contains(item.ItemIndex) && SelectedItemIndexes.Count > 1)
UnselectItem(item.ItemIndex);
else
SelectItem(item.ItemIndex, false);
startDiapasonSelectedItemIndex = -1;
}
else if (Control.ModifierKeys == Keys.Shift)
{
if (SelectedItemIndexes.Count == 1)
startDiapasonSelectedItemIndex = SelectedItemIndexes.First();
if (startDiapasonSelectedItemIndex >= 0)
SelectItems(Math.Min(startDiapasonSelectedItemIndex, item.ItemIndex),
Math.Max(startDiapasonSelectedItemIndex, item.ItemIndex));
}
}
if (!MultiSelect || Control.ModifierKeys == Keys.None)
if (!SelectedItemIndexes.Contains(item.ItemIndex) || SelectedItemIndexes.Count > 1)
SelectItem(item.ItemIndex, true);
Invalidate();
}
protected virtual void OnExpandBoxClick(VisibleItemInfo info)
{
if (info.Expanded)
CollapseItem(info.ItemIndex);
else
ExpandItem(info.ItemIndex);
}
protected virtual void OnCheckboxClick(VisibleItemInfo info)
{
if (GetItemChecked(info.ItemIndex))
UncheckItem(info.ItemIndex);
else
CheckItem(info.ItemIndex);
}
protected virtual void DrawItem(Graphics gr, VisibleItemInfo info)
{
DrawItemBackgound(gr, info);
if (lastDragAndDropEffect == null)//do not draw selection when drag&drop over the control
if (SelectedItemIndex.Contains(info.ItemIndex))
DrawSelection(gr, info);
DrawItemIcons(gr, info);
DrawItemContent(gr, info);
}
protected virtual void OnCheckboxClick(VisibleItemInfo info)
{
if (CheckedItemIndex.Contains(info.ItemIndex))
UncheckItem(info.ItemIndex);
else
CheckItem(info.ItemIndex);
}
