public static void UseSystemImageList(ListView control)
{
IntPtr large, small;
int x, y;
if (control.LargeImageList == null)
{
control.LargeImageList = new ImageList();
}
if (control.SmallImageList == null)
{
control.SmallImageList = new ImageList();
}
Shell32.FileIconInit(true);
if (!Shell32.Shell_GetImageLists(out large, out small))
{
throw new Exception("Failed to get system image list");
}
ComCtl32.ImageList_GetIconSize(large, out x, out y);
control.LargeImageList.ImageSize = new Size(x, y);
ComCtl32.ImageList_GetIconSize(small, out x, out y);
control.SmallImageList.ImageSize = new Size(x, y);
User32.SendMessage(control.Handle, MSG.LVM_SETIMAGELIST,
(int)LVSIL.LVSIL_NORMAL, LargeImageList);
User32.SendMessage(control.Handle, MSG.LVM_SETIMAGELIST,
(int)LVSIL.LVSIL_SMALL, SmallImageList);
}
/// <summary>
/// Sets the image list.
/// </summary>
/// <param name="this">The list view instance.</param>
/// <param name="imageListType">Type of the image list.</param>
/// <param name="imageListHandle">The image list handle.</param>
public static void SetImageList(this ListView @this, ImageListType imageListType, IntPtr imageListHandle)
{
// If we're using the group header image list (not wrapped by .NET),
// just go straight to the Win32 API - we'll be using it from there
// anyway.
if (imageListType == ImageListType.GroupHeader)
{
// Set the image list.
User32.SendMessage(@this.Handle, LVM_SETIMAGELIST, (uint)imageListType, imageListHandle);
// That's all we need to do.
return;
}
// Get the image list details.
int cx, cy;
ComCtl32.ImageList_GetIconSize(imageListHandle, out cx, out cy);
var imageCount = ComCtl32.ImageList_GetImageCount(imageListHandle);
// This isn't actually enough for a Winforms list view - we actually need to create a copy of the
// image list.
var imageList = new ImageList();
imageList.ImageSize = new Size(cx, cy);
for (int i = 0; i < imageCount; i++)
{
// Get the icon.
var hIcon = ComCtl32.ImageList_GetIcon(imageListHandle, i, 0);
// Create it.
var icon = Icon.FromHandle(hIcon);
// Add it.
imageList.Images.Add(icon);
}
// Set the image list.
switch (imageListType)
{
case ImageListType.Normal:
@this.LargeImageList = imageList;
break;
case ImageListType.Small:
@this.SmallImageList = imageList;
break;
case ImageListType.State:
@this.StateImageList = imageList;
break;
default:
throw new ArgumentOutOfRangeException("imageListType");
}
}