/// <summary>
/// 获取文件的缩略图
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public Image GetThumbNail(string fileName)
{
Bitmap bmp;
try
{
bmp = (Bitmap)DrawingTool.GetImage(fileName);
}
catch
{
bmp = new Bitmap(ThumbNailSize, ThumbNailSize); //If we cant load the image, create a blank one with ThumbSize
}
bmp = (Bitmap)DrawingTool.GetScaleImage(bmp, ThumbNailSize, ThumbNailSize);
if (bmp.Width < ThumbNailSize || bmp.Height < ThumbNailSize)
{
Bitmap bitmap2 = new Bitmap(ThumbNailSize, ThumbNailSize);
Graphics g = Graphics.FromImage(bitmap2);
Point point = new Point();
point.X = (ThumbNailSize - bmp.Width) / 2;
point.Y = (ThumbNailSize - bmp.Height) / 2;
g.DrawImage(bmp, point);
g.Dispose();
bmp.Dispose();
return(bitmap2);
}
return(bmp);
}
public void Paint(System.Drawing.Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex,
DataGridViewElementStates elementState, object value, object formattedValue, string errorText,
DataGridViewCellStyle cellStyle)
{
if (value == null)
{
return;
}
if ((value is Image) == false)
{
Debug.Assert(false, "value 不是 Image");
return;
}
Image image = (Image)value;
bool scaleImage = false;
if (image.Width > cellBounds.Width || image.Height > cellBounds.Height)
{
scaleImage = true;
int imageWidth = cellBounds.Width - 2;
int imageHeight = cellBounds.Height - 2;
image = DrawingTool.GetScaleImage(image, imageWidth, imageHeight);
}
Point drawInPoint = new Point(cellBounds.X + cellBounds.Width / 2 - image.Width / 2,
cellBounds.Y + cellBounds.Height / 2 - image.Height / 2);
graphics.DrawImage(image, new Rectangle(drawInPoint, image.Size));
if (scaleImage)
{
image.Dispose();
}
}
protected override void Paint(System.Drawing.Graphics graphics, System.Drawing.Rectangle clipBounds,
System.Drawing.Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value,
object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle
advancedBorderStyle, DataGridViewPaintParts paintParts)
{
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle,
advancedBorderStyle, paintParts);
graphics.FillRectangle(Brushes.White, cellBounds.X + 1, cellBounds.Y + 1, cellBounds.Width - 2, cellBounds.Height - 2);
int imageLocationX = cellBounds.X + 2;
int imageLocationY = cellBounds.Y + 2;
int imageSizeW = 16;
int imageSizeH = 16;
Rectangle imageBounds = new Rectangle(imageLocationX, imageLocationY, imageSizeW, imageSizeH);
int textLocationX = imageLocationX + imageSizeW + 2;
int textLocationY = cellBounds.Y + 4;
Point textLoation = new Point(textLocationX, textLocationY);
if (this.Value != null && this.Value.ToString() != String.Empty)
{
string resourceName = this.Value.ToString();
Image imageDraw;
if (_resourceService.Container(resourceName))
{
ImageResourceInfo imageResource = _resourceService.GetImageResource(resourceName);
Image image = imageResource.GetImage();
imageDraw = DrawingTool.GetScaleImage(image, imageSizeW, imageSizeH);
if (image != imageDraw)
{
image.Dispose();
}
}
else
{
imageDraw = DrawingTool.Mark.FileNotFind(imageBounds.Size);
}
try
{
graphics.DrawImage(imageDraw, imageBounds);
}
catch (Exception exception)
{
Debug.Assert(false, exception.Message);
imageDraw = DrawingTool.Mark.FileNotFind(imageBounds.Size);
graphics.DrawImage(imageDraw, imageBounds);
}
imageDraw.Dispose();
Font font = new Font(cellStyle.Font, cellStyle.Font.Style | FontStyle.Bold);
Brush textBrush = new SolidBrush(cellStyle.ForeColor);
graphics.DrawString(resourceName, font, textBrush, textLoation);
font.Dispose();
textBrush.Dispose();
}
}
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;
int height = LayoutManager.ItemSize.Height - _itemPadding.Height * 3 - _headerHeight;
_thumbnailSize = new Size(width, height);
_thumbnailSizeInited = true;
}
Image img = null;
if (_thumbnailsCache.Container(item))
{
img = _thumbnailsCache.GetThumbnail(item);
}
else
{
img = DrawingTool.GetScaleImage(item.Image, _thumbnailSize);
_thumbnailsCache.AddThumbnail(item, img);
}
if (img != null)
{
Rectangle pos = DrawingTool.GetSizedImageBounds(img, new Rectangle(bounds.Location + _itemPadding, _thumbnailSize));
g.DrawImage(img, pos);
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))
{
g.DrawRectangle(pInnerBorder, Rectangle.Inflate(pos, -1, -1));
}
}
}
}
_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);
using (SolidBrush brush = new SolidBrush(Theme.ItemHeaderColor))
{
g.DrawString(item.Header, Theme.ItemHeaderFont, brush, _headerBounds, _itemHeaderStringFormat);
}
}
