/// <summary>
/// Paints the background of the item.
/// </summary>
/// <param name="e">Event arguments.</param>
protected virtual void OnDrawBackground(DrawNodeEventArgs e)
{
DrawBackground?.Invoke(this, e);
if (e.Handled)
{
return;
}
using (Brush back = new SolidBrush(!e.Enabled ? DisabledBackColor :
!e.ControlHasFocus && e.Selected ? UnfocusedItemBackColor :
e.Selected?SelectedItemBackColor:
e.Hovered ? HoveredItemBackColor : BackColor))
{
e.Graphics.FillRectangle(back, e.Bounds);
}
}
/// <summary>
/// Renders a list item.
/// </summary>
/// <param name="graphics">The graphics object to draw on.</param>
/// <param name="bounds">Bounds of the item.</param>
/// <param name="node">The node to draw.</param>
/// <param name="enabled">Whether the item is enabled.</param>
/// <param name="selected">Whether the item is selected.</param>
/// <param name="hovered">Whether the mouse cursor is over the item.</param>
/// <param name="controlHasFocus">Whether the control has input focus.</param>
public void DrawItem(Graphics graphics, Rectangle bounds, FileSystemNode node, bool enabled, bool selected, bool hovered, bool controlHasFocus)
{
DrawNodeEventArgs e = new DrawNodeEventArgs(graphics, bounds, node, enabled, selected, hovered, controlHasFocus);
OnDrawBackground(e);
OnDrawBorder(e);
if (e.Node.IsPathValid)
{
OnDrawContents(e);
}
else
{
OnDrawErrorMessage(e);
}
}
/// <summary>
/// Paints the contents of the control.
/// </summary>
/// <param name="e">Event arguments.</param>
protected virtual void OnDrawContents(DrawNodeEventArgs e)
{
DrawContents?.Invoke(this, e);
if (e.Handled)
{
return;
}
var eLines = new GetLineCountEventArgs(e.Node);
OnGetLineCount(eLines);
int lines = eLines.LineCount;
float textHeight = GetTextHeight(e.Node);
RectangleF iconRect = new RectangleF(e.Bounds.Left + ContentPadding.Width, e.Bounds.Top + (e.Bounds.Height - ThumbnailSize.Height) / 2f,
ThumbnailSize.Width, ThumbnailSize.Height);
RectangleF textRect = new RectangleF(e.Bounds.Left + ContentPadding.Width + ThumbnailSize.Width + ThumbnailTextSpacing, e.Bounds.Top + (e.Bounds.Height - textHeight) / 2f,
e.Bounds.Width - iconRect.Width - 2 * ContentPadding.Width - ThumbnailTextSpacing, textHeight);
// Draw the image
if (e.Node.Thumbnail != null)
{
Rectangle pos = Utility.GetSizedIconBounds(e.Node.Thumbnail, Utility.ToRectangle(iconRect), 0.0f, 0.5f);
e.Graphics.DrawImage(e.Node.Thumbnail, pos);
}
// Draw item text
RectangleF lineBounds = textRect;
for (int i = 0; i < eLines.LineCount; i++)
{
var eHeight = new GetLineHeightEventArgs(e.Node, i);
OnGetLineHeight(eHeight);
float lineHeight = eHeight.LineHeight > 0 ? eHeight.LineHeight : Font.Height;
lineBounds.Height = lineHeight;
// Draw line of text
DrawNodeLineEventArgs eLine = new DrawNodeLineEventArgs(e.Graphics,
Utility.ToRectangle(lineBounds), e.Node, e.Enabled, e.Selected, e.Hovered, e.ControlHasFocus, i);
OnDrawLine(eLine);
// Offset the bounds to the next line below
lineBounds.Offset(0, lineHeight + Font.Height * 0.2f);
}
}
/// <summary>
/// Paints the border of the item.
/// </summary>
/// <param name="e">Event arguments.</param>
protected virtual void OnDrawBorder(DrawNodeEventArgs e)
{
DrawBorder?.Invoke(this, e);
if (e.Handled)
{
return;
}
if (!e.Enabled && e.Selected)
{
using (Pen bFocus = new Pen(DisabledItemBorderColor))
{
e.Graphics.DrawRectangle(bFocus, e.Bounds.Left, e.Bounds.Top, e.Bounds.Width - 1, e.Bounds.Height - 1);
}
}
else if (!e.ControlHasFocus && e.Selected)
{
using (Pen bFocus = new Pen(UnfocusedItemBorderColor))
{
e.Graphics.DrawRectangle(bFocus, e.Bounds.Left, e.Bounds.Top, e.Bounds.Width - 1, e.Bounds.Height - 1);
}
}
else if (e.Selected)
{
using (Pen bFocus = new Pen(SelectedItemBorderColor))
{
e.Graphics.DrawRectangle(bFocus, e.Bounds.Left, e.Bounds.Top, e.Bounds.Width - 1, e.Bounds.Height - 1);
}
}
else if (BorderStyle == BorderStyle.FixedSingle)
{
ControlPaint.DrawBorder3D(e.Graphics, e.Bounds, Border3DStyle.Flat);
}
else if (BorderStyle == BorderStyle.Fixed3D)
{
ControlPaint.DrawBorder3D(e.Graphics, e.Bounds, Border3DStyle.RaisedOuter);
}
}
/// <summary>
/// Draws an error message if the path is invalid.
/// </summary>
/// <param name="e">Event arguments.</param>
protected virtual void OnDrawErrorMessage(DrawNodeEventArgs e)
{
DrawErrorMessage?.Invoke(this, e);
if (e.Handled)
{
return;
}
Rectangle bounds = e.Bounds;
bounds.Inflate(-ContentPadding.Width, -ContentPadding.Height);
// Draw item text
using (Brush bError = new SolidBrush(ErrorTextColor))
using (StringFormat stringFormat = new StringFormat())
{
stringFormat.Alignment = StringAlignment.Near;
stringFormat.LineAlignment = StringAlignment.Near;
stringFormat.Trimming = StringTrimming.EllipsisCharacter;
e.Graphics.DrawString(e.Node.ErrorMessage, Font, bError, bounds, stringFormat);
}
}
