WM_DPICHANGED_BEFOREPARENT top-level constant Null safety
For Per Monitor v2 top-level windows, this message is sent to all HWNDs in the child HWND tree of the window that is undergoing a DPI change. This message occurs before the top-level window receives WM_DPICHANGED, and traverses the child tree from the bottom up. Requires Windows 10, version 1703 or higher.
const WM_DPICHANGED_BEFOREPARENT = 0x02E2;