public static OwnerDrawnItemImageState RetrieveOrCacheImage(ImageList imagelist, string image)
{
//Check to need to see if the imagelist has been encountered before...
if (!keyImageStates.ContainsKey(imagelist))
{
if (!watchedImageLists.Contains(imagelist))
{
imagelist.Disposed += new EventHandler(imagelist_Disposed);
watchedImageLists.Add(imagelist);
}
keyImageStates.Add(imagelist, new Dictionary <string, OwnerDrawnItemImageState>());
}
//Check if the image has been encountered before...
if (!keyImageStates[imagelist].ContainsKey(image))
{
//When the key exists on the imagelist, obtain a copy of the image
//in a System.Drawing.Bitmap object and process the disabled/shadow states.
if (imagelist.Images.ContainsKey(image))
{
Bitmap normalImage = new Bitmap(imagelist.Images[image]), disabledImage = null, shadowImage = null;
ProcessStyles(normalImage, ref disabledImage, ref shadowImage);
OwnerDrawnItemImageState imageState = new OwnerDrawnItemImageState(normalImage, disabledImage, shadowImage);
keyImageStates[imagelist].Add(image, imageState);
return(imageState);
}
else //No matching key exists...
{
return(new OwnerDrawnItemImageState());
}
}
else
{ //return the cached image.
return(keyImageStates[imagelist][image]);
}
}
public static OwnerDrawnItemImageState RetrieveOrCacheImage(Bitmap image, Color transparencyColor)
{
if (!(bitmapImageStates.ContainsKey(image)))
{
//When the image Item isn't inside the state dictionary, copy the base,
//and process sub-styles, then insert it into the cache.
Bitmap normalImage = new Bitmap((Image)image), disabledImage = null, shadowImage = null;
normalImage.MakeTransparent(transparencyColor);
//Used to process shadow/disabled states.
ProcessStyles(normalImage, ref disabledImage, ref shadowImage);
OwnerDrawnItemImageState imageState = new OwnerDrawnItemImageState(normalImage, disabledImage, shadowImage);
bitmapImageStates.Add(image, imageState);
return(imageState);
}
else
{//Return the cached image.
return(bitmapImageStates[image]);
}
}