sdl_rail_window_style.hpp

 
#pragma once
 
#include <cstdint>
 
#include <freerdp/window.h>
 
struct SdlRailWindowStyle
{
  bool popup = false;
  bool layered = false;
  bool clickThrough = false;
  bool overlay = false;
};
 
/*
 * RAIL carries the window style, but not SetWindowPos flags such as SWP_NOACTIVATE. An unowned,
 * caption-less WS_EX_TOOLWINDOW/WS_POPUP is therefore treated as a popup even when applications
 * add decoration bits such as WS_SYSMENU or WS_MINIMIZEBOX. Keep owned popup/tool windows on their
 * existing path: some applications implement their own drag loop for those windows.
 */
inline SdlRailWindowStyle classifySdlRailWindowStyle(uint32_t style, uint32_t exStyle, bool owned)
{
  /* WS_CAPTION is WS_BORDER | WS_DLGFRAME; a partial match is only a border. */
  const bool captioned = (style & WS_CAPTION) == WS_CAPTION;
  const bool isDialogOrApp =
      captioned ||
      ((style & (WS_SYSMENU | WS_THICKFRAME | WS_MINIMIZEBOX | WS_MAXIMIZEBOX)) != 0) ||
      ((exStyle & WS_EX_APPWINDOW) != 0);
  const bool isToolOrPopup =
      ((exStyle & (WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW)) != 0) || ((style & WS_POPUP) != 0);
  const bool noActivate =
      ((exStyle & WS_EX_NOACTIVATE) != 0) && ((exStyle & WS_EX_APPWINDOW) == 0);
  const bool unownedPopup =
      !owned && !captioned && ((style & WS_POPUP) != 0) &&
      ((exStyle & (WS_EX_TOOLWINDOW | WS_EX_APPWINDOW)) == WS_EX_TOOLWINDOW);
 
  /* Route drag/feedback overlays through the popup path. */
  constexpr uint32_t overlayEx = WS_EX_LAYERED | WS_EX_TOOLWINDOW | WS_EX_TOPMOST;
  const bool overlay = ((exStyle & overlayEx) == overlayEx) &&
                       ((exStyle & (WS_EX_NOACTIVATE | WS_EX_APPWINDOW)) == 0) && !captioned;
 
  return { noActivate || overlay || unownedPopup || (isToolOrPopup && !isDialogOrApp),
         ((exStyle & WS_EX_LAYERED) != 0) && !isDialogOrApp, (exStyle & WS_EX_TRANSPARENT) != 0,
         overlay };
}