NX Tool Kit (NXTK)

NXTK implements where the framed window. NX framed windows consist of three components within one NX window:

1. The window border,
2. The main client window area, and
3. A toolbar area

Each sub-window represents a region within one window. Figure 1 shows some simple NX framed windows. NXTK allows these sub-windows to be managed more-or-less independently:

• Each component has its own callbacks for redraw and position events as well as mouse and keyboard inputs. The client sub-window callbacks are registered when the framed window is created with a call to :cnxtk_openwindow; Separate toolbar sub-window callbacks are reigistered when the toolbar is added using :cnxtk_opentoolbar{.interpreted-text role="func"}. (NOTES: (1) only the client sub-window receives keyboard input and, (2) border callbacks are not currently accessible by the user).
• All position informational provided within the callback is relative to the specific sub-window. That is, the origin (0,0) of the coordinate system for each sub-window begins at the top left corner of the subwindow. This means that toolbar logic need not be concerned about client window geometry (and vice versa) and, for example, common toolbar logic can be used with different windows.