/// <summary>
/// 绘制项的边框
/// </summary>
/// <param name="g"></param>
/// <param name="bounds"></param>
internal virtual void DrawItemBorder(Graphics g, Rectangle bounds)
{
using (Pen pWhite128 = new Pen(Color.FromArgb(128, Theme.ItemBorderColor)))
{
ImageListViewUtility.DrawRoundedRectangle(g, pWhite128, bounds.Left, bounds.Top, bounds.Width - 1, bounds.Height - 1, _radius);
}
}
/// <summary>
/// 绘制项
/// </summary>
/// <param name="g"></param>
/// <param name="item"></param>
/// <param name="state"></param>
/// <param name="bounds"></param>
internal virtual void DrawItem(Graphics g, ImageListViewItem item)
{
Rectangle bounds = LayoutManager.GetItemBounds(item);
g.SetClip(bounds);
DrawItemBackground(g, bounds);
// Paint background Selected
if ((LayoutManager.Focused && ((item.State & ImageListViewItemState.Selected) == ImageListViewItemState.Selected)) ||
(LayoutManager.Focused == false && ((item.State & ImageListViewItemState.Selected) == ImageListViewItemState.Selected) && ((item.State & ImageListViewItemState.Hovered) == ImageListViewItemState.Hovered)))
{
using (Brush bSelected = new LinearGradientBrush(bounds, Theme.SelectedColorStart, Theme.SelectedColorEnd, LinearGradientMode.Vertical))
{
ImageListViewUtility.FillRoundedRectangle(g, bSelected, bounds, 4);
}
}
// Paint background unfocused
else if (LayoutManager.Focused == false && ((item.State & ImageListViewItemState.Selected) == ImageListViewItemState.Selected))
{
using (Brush bGray64 = new LinearGradientBrush(bounds, Theme.UnFocusedColorStart, Theme.UnFocusedColorEnd, LinearGradientMode.Vertical))
{
ImageListViewUtility.FillRoundedRectangle(g, bGray64, bounds, 4);
}
}
// Paint background Hovered
//如果正处于框选状态，不绘制Hover状态，减小闪烁
if (LayoutManager.MouseSelecting == false && (item.State & ImageListViewItemState.Hovered) == ImageListViewItemState.Hovered)
{
using (Brush bHovered = new LinearGradientBrush(bounds, Theme.HoverColorStart, Theme.HoverColorEnd, LinearGradientMode.Vertical))
{
ImageListViewUtility.FillRoundedRectangle(g, bHovered, bounds, 4);
}
}
DrawItemBorder(g, bounds);
// Focus rectangle
if (LayoutManager.Focused && ((item.State & ImageListViewItemState.Focused) == ImageListViewItemState.Focused))
{
ControlPaint.DrawFocusRectangle(g, bounds);
}
DrawItemContent(g, bounds, item);
}
internal override void DrawItemContent(Graphics g, Rectangle bounds, ImageListViewItem item)
{
if (_thumbnailSizeInited == false)
{
SizeF headerSize = g.MeasureString(item.Header, Theme.ItemHeaderFont);
_headerHeight = (int)Math.Ceiling(headerSize.Height);
int width = LayoutManager.ItemSize.Width - _itemPadding.Width * 2;
//_itemPadding.Height * 3 是因为去掉缩略图顶部，底部，和与文本区域之间的Padding
int height = LayoutManager.ItemSize.Height - _itemPadding.Height * 3 - _headerHeight;
_thumbnailSize = new Size(width, height);
_thumbnailSizeInited = true;
}
#region 绘制缩略图
Image img = null;
if (_thumbnailsCache.Container(item))
{
img = _thumbnailsCache.GetThumbnail(item);
}
else
{
img = ImageListViewUtility.GetScaleImage(item.Image, _thumbnailSize);
_thumbnailsCache.AddThumbnail(item, img);
}
if (img != null)
{
Rectangle pos = ImageListViewUtility.GetSizedImageBounds(img, new Rectangle(bounds.Location + _itemPadding, _thumbnailSize));
g.DrawImage(img, pos);
// Draw image border
if (Math.Min(pos.Width, pos.Height) > 32)
{
using (Pen pOuterBorder = new Pen(Theme.ImageOuterBorderColor))
{
g.DrawRectangle(pOuterBorder, pos);
}
if (System.Math.Min(_thumbnailSize.Width, _thumbnailSize.Height) > 32)
{
using (Pen pInnerBorder = new Pen(Theme.ImageInnerBorderColor))
{
//Rectangle.Inflate(pos, -1, -1) 用于取内框
g.DrawRectangle(pInnerBorder, Rectangle.Inflate(pos, -1, -1));
}
}
}
}
#endregion
#region 绘制文本
_headerBounds = new Rectangle();
_headerBounds.X = _itemPadding.Width;
_headerBounds.Y = LayoutManager.ItemSize.Height - _headerHeight - _itemPadding.Height;
_headerBounds.Width = _thumbnailSize.Width;
_headerBounds.Height = _headerHeight;
_headerBounds.Offset(bounds.Location);
//g.DrawRectangle(Pens.Gray, _headerBounds);
using (SolidBrush brush = new SolidBrush(Theme.ItemHeaderColor))
{
g.DrawString(item.Header, Theme.ItemHeaderFont, brush, _headerBounds, _itemHeaderStringFormat);
}
#endregion
}