Check Boxes
A
check box consists of a square box and application-defined text (label), an icon, or a
bitmap that indicates a choice the user can make by selecting the button.
Applications typically display check boxes in a group box to permit the user to
choose from a set of related, but independent options. For example, an application
might present a group of check boxes from which the user can select error
conditions that produce warning beeps.
A check box can be one of four styles: standard, automatic, three-state, and
automatic three-state, as defined by the constants BS_CHECKBOX, BS_AUTOCHECKBOX,
BS_3STATE, and BS_AUTO3STATE, respectively. Each style can assume two check
states: checked (an check mark inside the box) or unchecked (no check mark). In
addition, a three-state check box can assume an indeterminate state (a grayed
box inside the check box). Repeatedly selecting a standard or automatic check box
toggles it from checked to unchecked and back again. Repeatedly selecting a
three-state check box toggles it from checked to unchecked to indeterminate and
back again.
When the user selects a check box (of any style), the check box receives the
keyboard focus from Windows, which sends the check box's parent window a
WM_COMMAND message containing the
BN_CLICKED notification code. The parent window doesn't acknowledge this message if it
comes from an automatic check box or automatic three-state check box, because
Windows automatically sets the check state for those styles. But the parent
window must acknowledge the message if it comes from a check box or three-state
check box because the parent window, not Windows, is responsible for setting the
check state for those styles. Regardless of the check box style, Windows
automatically repaints the check box once its state is changed.
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