Control windows are used most often as part of a frame or dialog window, but they also can be used in a client window. An application can create control windows in a frame window by using frame-control flags in the WinCreateStdWindow function, or it can create control windows individually by calling the WinCreateWindow function.
Including control windows in a dialog window requires the use of a dialog template, which is a data structure that describes a dialog window and its control windows. The system uses the data in the dialog template to create the dialog window and control windows. An application can create a dialog template at run time, or it can use the system resource compiler to create a dialog-template resource.
The operating system provides many types of predefined control windows. An application can create a control of a particular type by specifying the appropriate control-window class name, either in the WinCreateWindow function or in a dialog template. The following is a list of the predefined control-window classes:
旼컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿎lass name 쿏escription � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_BUTTON 쿎onsists of buttons and boxes the user can � � 퀂elect by clicking the pointing device or � � 퀅sing the keyboard. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_COMBOBOX 쿎reates a combination-box control, which � � 쿬ombines a list-box control and an � � 쿮ntry-field control. It allows the user to � � 쿮nter data by typing in the entry field or � � 쿬hoosing from a list in the list box. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_CONTAINER 쿎reates a control for the user to group � � 쿽bjects in a logical manner. A container can� � 쿭isplay those objects in various formats or � � 퀆iews. The container control supports drag � � 쿪nd drop so the user can place information in� � 쿪 container by simply dragging and dropping. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_ENTRYFIELD 쿎onsists of a single line of text that the � � 퀅ser can edit. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_FRAME 쿌 composite window class that can contain � � 쿬hild windows of many of the other window � � 쿬lasses. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_LISTBOX 쿛resents a list of text items from which the � � 퀅ser can make selections. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_MENU 쿛resents a list of items that can be � � 쿭isplayed horizontally as action bars, or � � 퀆ertically as pull-down menus. Menus usually� � 쿪re used to provide a command interface to � � 쿪pplications. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_NOTEBOOK 쿎reates a control for the user that is � � 쿭isplayed as a number of pages. The top page� � 쿶s visible, and the others are hidden, with � � 퀃heir presence being indicated by a visible � � 쿮dge on each of the back pages. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_SCROLLBAR 쿎onsists of window scroll bars that let the � � 퀅ser request to scroll the contents of an � � 쿪ssociated window. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_SLIDER 쿎reates a control that is usable for � � 쿾roducing approximate (analog) values or � � 쿾roperties. Scroll bars were used for this � � 쿯unction in the past, but the slider provides� � 쿪 more flexible method of achieving the same � � 퀁esult, with less programming effort. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_SPINBUTTON 쿎reates a control that presents itself to the� � 퀅ser as a scrollable ring of choices, giving � � 퀃he user quick access to the data. The user � � 쿶s presented only one item at a time, so the � � 퀂pin button should be used with data that is � � 쿶ntuitively related. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_STATIC 쿞imple display items that do not respond to � � 쿸eyboard or pointing device events. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_TITLEBAR �Displays the window title or caption and lets� � 퀃he user move the window's owner. � 쳐컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥C_VALUESET 쿎reates a control similar in function to the � � 퀁adio buttons but provides additional � � 쿯lexibility to display graphical, textual, � � 쿪nd numeric formats. The values set with � � 퀃his control are mutually exclusive. � 읕컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�
A control window is always owned by another window, usually a frame or dialog window. This relationship is important because a control window sends WM_CONTROL messages to its owner whenever an input event occurs in the control window. Each WM_CONTROL message includes the identifier of the control window in which the event occurred and a notification code that specifies the nature of the event. An application specifies a control window's ID either in the WinCreateWindow function or in a dialog template. Each ID must be unique.
Control windows are like other predefined window classes in that they respond to standard window-management messages and functions, such as WinSetWindowText and WinShowWindow.
All control-window classes have a set of specific messages they send and receive. The summary at the end of this chapter lists the messages that all control windows have in common.
The system paints most control windows synchronously-that is, it redraws a control window as soon as any part of that window becomes invalid.