/// <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>
/// Gets the minimum height of an item.
/// </summary>
/// <param name="node">The node to measure.</param>
/// <returns>Minimum item height.</returns>
public int GetTextHeight(FileSystemNode node)
{
var e = new GetLineCountEventArgs(node);
OnGetLineCount(e);
float textHeight = 0;
for (int i = 0; i < e.LineCount; i++)
{
var eh = new GetLineHeightEventArgs(node, i);
textHeight += eh.LineHeight > 0 ? eh.LineHeight : Font.Height;
}
textHeight += (e.LineCount - 1) * Font.Height * LineSpacing;
return((int)textHeight);
}
/// <summary>
/// Gets the minimum height of an item.
/// </summary>
/// <param name="node">The node to measure.</param>
/// <returns>Minimum item height.</returns>
public int GetItemHeight(FileSystemNode node)
{
var e = new GetLineCountEventArgs(node);
OnGetLineCount(e);
float textHeight = 0;
for (int i = 0; i < e.LineCount; i++)
{
var eh = new GetLineHeightEventArgs(node, i);
textHeight += eh.LineHeight > 0 ? eh.LineHeight : Font.Height;
}
textHeight += (e.LineCount - 1) * Font.Height * LineSpacing;
float maxHeight = Math.Max(textHeight, ThumbnailSize.Height);
return((int)(maxHeight + 2 * ContentPadding.Height));
}
/// <summary>
/// Gets the line height of an item.
/// </summary>
/// <param name="e">Event arguments.</param>
protected virtual void OnGetLineHeight(GetLineHeightEventArgs e)
{
GetLineHeight?.Invoke(this, e);
}
