/// <summary>
/// Modify a WinForms TreeView control to use the new Explorer style theme
/// </summary>
/// <param name="treeView">The tree view control to modify</param>
public static void ApplyTreeViewThemeStyles(TreeView treeView)
{
ArgumentNullException.ThrowIfNull(treeView);
treeView.HotTracking = true;
treeView.ShowLines = false;
IntPtr hwnd = treeView.Handle;
ComCtl32.TVS_EX exstyle = (ComCtl32.TVS_EX)User32.SendMessageW(hwnd, (User32.WM)ComCtl32.TVM.GETEXTENDEDSTYLE);
exstyle |= ComCtl32.TVS_EX.DOUBLEBUFFER | ComCtl32.TVS_EX.FADEINOUTEXPANDOS;
User32.SendMessageW(hwnd, (User32.WM)ComCtl32.TVM.SETEXTENDEDSTYLE, 0, (nint)exstyle);
}
/// <summary>
/// Modify a WinForms TreeView control to use the new Explorer style theme
/// </summary>
/// <param name="treeView">The tree view control to modify</param>
public static void ApplyTreeViewThemeStyles(TreeView treeView)
{
if (treeView == null)
{
throw new ArgumentNullException(nameof(treeView));
}
treeView.HotTracking = true;
treeView.ShowLines = false;
IntPtr hwnd = treeView.Handle;
ComCtl32.TVS_EX exstyle = TreeView_GetExtendedStyle(hwnd);
exstyle |= ComCtl32.TVS_EX.DOUBLEBUFFER | ComCtl32.TVS_EX.FADEINOUTEXPANDOS;
TreeView_SetExtendedStyle(hwnd, exstyle, 0);
}
/// <summary>
/// Modify a WinForms TreeView control to use the new Explorer style theme
/// </summary>
/// <param name="treeView">The tree view control to modify</param>
public static void ApplyTreeViewThemeStyles(TreeView treeView)
{
if (treeView is null)
{
throw new ArgumentNullException(nameof(treeView));
}
treeView.HotTracking = true;
treeView.ShowLines = false;
IntPtr hwnd = treeView.Handle;
ComCtl32.TVS_EX exstyle = (ComCtl32.TVS_EX)User32.SendMessageW(hwnd, (User32.WM)ComCtl32.TVM.GETEXTENDEDSTYLE);
exstyle |= ComCtl32.TVS_EX.DOUBLEBUFFER | ComCtl32.TVS_EX.FADEINOUTEXPANDOS;
User32.SendMessageW(hwnd, (User32.WM)ComCtl32.TVM.SETEXTENDEDSTYLE, IntPtr.Zero, (IntPtr)exstyle);
}
private static void TreeView_SetExtendedStyle(IntPtr handle, ComCtl32.TVS_EX extendedStyle, int mask)
{
User32.SendMessageW(handle, (User32.WindowMessage)NativeMethods.TVM_SETEXTENDEDSTYLE, (IntPtr)mask, (IntPtr)extendedStyle);
}
