public override RectangleF MeasureContentBoundsF(ContentDrawArgs args) {
var image = this.FoldedImage;
if (image == null) {
return Miscs.GetInternalContactRectF(args.ViewBoundsF, new SizeF(1, 1));
}
else {
return Miscs.GetInternalContactRectF(args.ViewBoundsF, image.Size);
}
}
public override void DrawContent(ContentDrawArgs args) {
// base.DrawContent(args);
using (var lockObj = _foldedImage.Lock()) {
var image = _foldedImage.Data;
if (image == null) return;
var srcRect = new Rectangle(0, 0, image.Width, image.Height);
var destRect = Miscs.GetInternalContactRect(args.ViewBoundsI, srcRect.Size);
args.Graphics.DrawImage(image, destRect, srcRect, GraphicsUnit.Pixel);
}
}
/// <summary>サムネイルを描画する</summary>
public virtual void DrawThumbnail(ContentDrawArgs args) {
if (_thumbnailCacheEnabled) {
if (_thumbnailImage == null) {
PrepareThumbnail();
}
var srcRect = _thumbnailSourceRect;
RectangleF destRect = Miscs.GetExternalContactRectF(args.ViewBoundsF, srcRect.Size);
args.Graphics.DrawImage(_thumbnailImage, destRect, srcRect, GraphicsUnit.Pixel);
}
else {
DrawContent(args);
}
}
/// <summary>サムネイルのキャッシュを準備する</summary>
public void PrepareThumbnail() {
if (!ThumbnailCacheEnabled) return;
this.InvalidateThumbnail();
// 描画
_thumbnailImage = new Bitmap(ThumbnailSize, ThumbnailSize);
using (var g = Graphics.FromImage(_thumbnailImage)) {
var drawArgs = new ContentDrawArgs();
drawArgs.Graphics = g;
drawArgs.ViewBoundsF = new RectangleF(0, 0, _thumbnailImage.Width, _thumbnailImage.Height);
_thumbnailSourceRect = MeasureContentBoundsF(drawArgs);
DrawContent(drawArgs);
}
}
/// <summary>描画されるコンテンツの矩形領域を返す</summary>
public virtual RectangleF MeasureContentBoundsF(ContentDrawArgs args) {
return args.ViewBoundsF;
}
/// <summary>コンテンツを描画する</summary>
public virtual void DrawContent(ContentDrawArgs args) {
args.Graphics.DrawString(this.Name, SystemFonts.DefaultFont, SystemBrushes.WindowText, args.ViewBoundsF);
}