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7.4 Exercises
Solutions to these exercises are supplied in Section B.2.2
Describe Figure 7-6, a state diagram that describes
the states and transitions between states for a window, as used in
Microsoft Windows. Identify the states and transitions shown in the
diagram.
Figure 7-6. States and transitions for a window
Update Figure 7-6 stepwise to show the following
details. After each step, check your answers against the solutions
shown in Appendix B:
If a window receives a Restore event, indicating
that the window should be restored or displayed, as one of many
windows taking a portion of the space on the user screen, and the
window is in the Minimized or
Maximized state, it will be changed to the
Restored state.
If a window receives a Minimize event, indicating
that the window should be minimized or displayed as an icon taking a
minimal amount of space on the user screen, and the window is in the
Restored or Maximized state, it
will be in the Minimized state.
If a window receives a Maximize event, indicating
that the window should be maximized or displayed as the only window
taking all the space on the user screen, and the window is in the
Minimized or Restored state, it
will be in the Maximized state.
Every time a window is being restored or maximized it performs a
Redraw action to render itself.
Every time a window is being minimized it requests that the OS reduce
its application priority using the LowPriority
action so that other restored or maximized application windows can
have more of the computer's power. The
LowPriority action requires that the
ApplicationID argument be passed to it so that the
operating system can identify the application whose priority is
lower.
