Evt_nc_paint drawing of non-client areas of Windows

Description

NC is non client meaning, the non-client area mainly includes the title bar, the status bar, toolbars and borders and other areas, currently wxwidgets just provides evt_nc_paint only a non-client area of the event, in MFC, there are also provide Wm_nclbuttondown Wm_nclbuttonup Wm_ncmousemove and other event operations, if you need to correlate these events, you must filter the event, or in the source code to implement such events

Currently need to drag the border, the customer area is unchanged, but the border becomes larger, until the border dragged to the appropriate place, the mouse bounce, customer area redraw

Evt_nc_paint drawing of non-client areas of Windows