A window can have a combination of styles; an application can combine styles by using the bitwise inclusive OR operator. An application usually sets the window styles when it creates the window. The OS/2 operating system provides several standard window styles that apply to all windows. It also provides many styles for the predefined frame and control windows. The frame and control styles are unique to each predefined window class and can be used only for windows of the corresponding class.
Initially, the styles of the window class used to create the window determine the styles of the new window. For example, if the window class has the style CS_SYNCPAINT, all windows created using that class, by default, will have the window style WS_SYNCPAINT. The OS/2 operating system has the following standard window styles:
旼컴컴컴컴컴컴컴컴컴컴컴컴쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿞tyle Name 쿏escription � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_CLIPCHILDREN 쿛revents a window from painting over its � � 쿬hild windows. This style increases the time � � 쿻ecessary to calculate the visible region. � � 쿟his style is usually not necessary because � � 쿶f the parent and child windows overlap and � � 쿫oth are invalidated, the system draws the � � 쿾arent window before drawing the child � � 퀇indow. If the child window is invalidated � � 쿶ndependently of the parent window, the � � 퀂ystem redraws only the child window. If the � � 퀅pdate region of the parent window does not � � 쿶ntersect the child window, drawing the � � 쿾arent window causes the child window to be � � 퀁edrawn. This style is useful to prevent a � � 쿬hild window that contains a complex graphic � � 쿯rom being redrawn unnecessarily. � � 쿥S_CLIPCHILDREN is an absolute requirement if� � 쿪 window with children ever performs output � � 쿶n response to any message other than � � 쿥M_PAINT. Only WM_PAINT processing is � � 퀂ynchronized such that the children will get � � 퀃heir messages after the parent. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_CLIPSIBLINGS 쿛revents a window from painting over its � � 퀂ibling windows. This style protects sibling � � 퀇indows but increases the time necessary to � � 쿬alculate the visible region. This style is � � 쿪ppropriate for windows that overlap and that� � 쿴ave the same parent window. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_DISABLED 쿢sed by an application to disable a window. � � 쿔t is up to the window to recognize this � � 퀂tyle and reject input. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_GROUP 쿞pecifies the first control of a group of � � 쿬ontrols in which the user can move from one � � 쿬ontrol to the next by using the ARROW keys. � � 쿌ll controls defined after the control with � � 퀃he WS_GROUP style belong to the same group. � � 쿟he next control with the WS_GROUP style ends� � 퀃he first group and starts a new group. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_MAXIMIZED 쿐nlarges a window to the maximum size. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_MINIMIZED 쿝educes a window to the size of an icon. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_PARENTCLIP 쿐xtends a window's visible region to include � � 퀃hat of its parent window. This style � � 퀂implifies the calculation of the child � � 퀇indow's visible region but is potentially � � 쿭angerous because the parent window's visible� � 퀁egion is usually larger than the child � � 퀇indow. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_SAVEBITS 쿞aves the screen area under a window as a bit� � 쿺ap. When the user hides or moves the window,� � 퀃he system restores the image by copying the � � 쿫its; there is no need to add the area to the� � 퀅ncovered window's update region. The style � � 쿬an improve system performance but also can � � 쿬onsume a great deal of memory. It is � � 퀁ecommended only for transient windows, such � � 쿪s menus and dialog windows, not for main � � 쿪pplication windows. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_SYNCPAINT 쿎auses a window to receive WM_PAINT messages � � 쿶mmediately after a part of the window � � 쿫ecomes invalid. Without this style, the � � 퀇indow receives WM_PAINT messages only if no � � 쿽ther message is waiting to be processed. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_TABSTOP 쿞pecifies one of any number of controls � � 퀃hrough which the user can move by tabbing. � � 쿛ressing the TAB key moves the keyboard focus� � 퀃o the next control that has the WS_TABSTOP � � 퀂tyle. � 쳐컴컴컴컴컴컴컴컴컴컴컴컴탠컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿥S_VISIBLE 쿘akes a window visible. The operating system � � 쿭raws the window on the screen unless � � 쿽verlapping windows completely obscure it. � � 쿥indows without this style are hidden. If � � 쿽verlapping windows completely obscure the � � 퀇indow, the window is still considered � � 퀆isible. (Visibility means that the � � 쿽perating system draws the window if it can.)� 읕컴컴컴컴컴컴컴컴컴컴컴컴좔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�