private void originForm_FormClosed(object sender, FormClosedEventArgs e)
{
if (this._thumbnail != null)
{
this._thumbnail.Dispose();
this._thumbnail = null;
}
}
private void RecomputeParentForm()
{
Form topLevelControl = base.TopLevelControl as Form;
if (topLevelControl == null)
{
this._topLevelForm = null;
if (this._thumbnail != null)
{
this._thumbnail.Dispose();
this._thumbnail = null;
}
}
else
{
if ((this._thumbnail != null) && (this._topLevelForm != topLevelControl))
{
this._thumbnail.Dispose();
this._thumbnail = null;
}
this._topLevelForm = topLevelControl;
}
}
private void RecomputeParentForm()
{
Form topLevelControl = base.TopLevelControl as Form;
if (topLevelControl == null)
{
this._topLevelForm = null;
if (this._thumbnail != null)
{
this._thumbnail.Dispose();
this._thumbnail = null;
}
}
else
{
if ((this._thumbnail != null) && (this._topLevelForm != topLevelControl))
{
this._thumbnail.Dispose();
this._thumbnail = null;
}
this._topLevelForm = topLevelControl;
}
}
public static void Unregister(Thumbnail handle)
{
if ((handle != null) && !handle.IsInvalid)
{
handle.Close();
}
}
public static extern int DwmUpdateThumbnailProperties(Thumbnail hThumbnailId, ref DwmThumbnailProperties ptnProperties);
public static extern int DwmRegisterThumbnail(IntPtr hwndDestination, IntPtr hwndSource, out Thumbnail phThumbnailId);
public static extern int DwmQueryThumbnailSourceSize(Thumbnail hThumbnail, out DwmSize pSize);
public void SetThumbnail(IntPtr originHandle)
{
this.RecomputeParentForm();
if (this._topLevelForm == null)
{
throw new Exception("Control must have an owner.");
}
this._thumbnail = DwmManager.Register(this._topLevelForm, originHandle);
this.UpdateThumbnail(base.Visible);
}
