Application Header file <X11/Xaw/Paned.h> Class Header file <X11/Xaw/PanedP.h> Class panedWidgetClass Class Name Paned Superclass Constraint The Paned widget manages children in a vertically or horizontally tiled fashion. The panes may be dynamically resized by the user by using the grips that appear near the right or bottom edge of the border between two panes. The Paned widget may accept any widget class as a pane except Grip. Grip widgets have a special meaning for the Paned widget, and adding a Grip as its own pane will confuse the Paned widget. The grips allow the panes to be resized by the user. The semantics of how these panes resize is somewhat complicated, and warrants further explanation here. When the mouse pointer is positioned on a grip and pressed, an arrow is displayed that indicates the pane that is to be to be resized. While keeping the mouse button down, the user can move the grip up and down (or left and right). This, in turn, changes the size of the pane. The size of the Paned widget will not change. Instead, it chooses another pane (or panes) to resize. For more details on which pane it chooses to resize, see Layout Semantics. One pointer binding allows the border between two panes to be moved, without affecting any of the other panes. When this occurs the pointer will change to an arrow that points along the pane border. The default bindings for the Paned widget's grips are: Mouse button Pane to Resize - Vertical Pane to Resize - Horizontal 1 (left) above the grip left of the grip 2 (middle) adjust border adjust border 3 (right) below the grip right of the grip _ When creating a Paned widget instance, the following resources are retrieved from the argument list or the resource database: Name Class Type Notes Default Value accelerators Accelerators AcceleratorTable NULL ancestorSensitive AncestorSensitive Boolean D True background Background Pixel XtDefaultBackground backgroundPixmap Pixmap Pixmap XtUnspecifiedPixmap betweenCursor Cursor Cursor A Depends on orientation borderColor BorderColor Pixel XtDefaultForeground borderPixmap Pixmap Pixmap XtUnspecifiedPixmap borderWidth BorderWidth Dimension 1 children ReadOnly WidgetList R NULL colormap Colormap Colormap Parent's Colormap cursor Cursor Cursor None depth Depth int C Parent's Depth destroyCallback Callback XtCallbackList NULL gripCursor Cursor Cursor A Depends on orientation gripIndent GripIndent Position 10 gripTranslations Translations TranslationTable see below height Height Dimension A Depends on orientation horizontalBetweenCursor Cursor Cursor sb_up_arrow horizontalGripCursor Cursor Cursor sb_h_double_arrow internalBorderColor BorderColor Pixel XtDefaultForeground internalBorderWidth BorderWidth Dimension 1 leftCursor Cursor Cursor sb_left_arrow lowerCursor Cursor Cursor sb_down_arrow mappedWhenManaged MappedWhenManaged Boolean True numChildren ReadOnly Cardinal R 0 orientation Orientation Orientation XtorientVertical refigureMode Boolean Boolean True rightCursor Cursor Cursor sb_right_arrow screen Screen Screen R Parent's Screen sensitive Sensitive Boolean True translations Translations TranslationTable NULL upperCursor Cursor Cursor sb_up_arrow verticalBetweenCursor Cursor Cursor sb_left_arrow verticalGripCursor Cursor Cursor sb_v_double_arrow width Width Dimension A Depends on orientation x Paned Position 0 y Paned Position 0 _ cursor The cursor to use when the mouse pointer is over the Paned widget, but not in any of its children (children may also inherit this cursor). It should be noted that the internal borders are actually part of the Paned widget, not the children. gripCursor The cursor to use when the grips are not active. The default value is verticalGripCursor or horizontalGripCursor depending on the orientation of the Paned widget. gripIndent The amount of space left between the right (or bottom) edge of the Paned widget and all the grips. gripTranslation Translation table that will be applied to all grips. horizontalBetweenCursor verticalBetweenCursor The cursor to be used for the grip when changing the boundary between two panes. These resources allow the cursors to be different depending on the orientation of the Paned widget. horizontalGripCursor verticalGripCursor The cursor to be used for the grips when they are not active. These resources allow the cursors to be different depending on the orientation of the Paned widget. internalBorderColor A pixel value which indexes the widget's colormap to derive the internal border color of the widget's window. The class name of this resource allows Paned*BorderColor: blue to set the internal border color for the Paned widget. An optimization is invoked if internalBorderColor and background are the same, and the internal borders are not drawn. internalBorderWidth is still left between the panes, however. internalBorderWidth The width of the internal borders. This is the amount of space left between the panes. The class name of this resource allows Paned*BorderWidth: 3 to set the internal border width for the Paned widget. leftCursor rightCursor The cursor used to indicate which is the important pane to resize when the Paned widget is oriented horizontally. lowerCursor upperCursor The cursor used to indicate which is the important pane to resize when the Paned widget is oriented vertically. This is not the same as the number of panes, since this also contains a grip for some of the panes, use XawPanedGetNumSub to retrieve the number of panes. orientation The orientation to stack the panes. This value can be either XtorientVertical or XtorientHorizontal. refigureMode This resource allows pane layout to be suspended. If this value is False, then no layout actions will be taken. This may improve efficiency when adding or removing more than one pane from the Paned widget. Each child of the Paned widget may request special layout resources be applied to it. These constraint resources allow the Paned widget's children to specify individual layout requirements. Name Class Type Notes Default Value allowResize Boolean Boolean False max Max Dimension Infinity min Min Dimension Height of Grips preferredPaneSize PreferredPaneSize Dimension ask child resizeToPreferred Boolean Boolean False showGrip ShowGrip Boolean True skipAdjust Boolean Boolean False _ allowResize If this value is False the the Paned widget will disallow all geometry requests from this child. max min The absolute maximum or minimum size for this pane. These values will never be overridden by the Paned widget. This may cause some panes to be pushed off the bottom (or right) edge of the paned widget. preferredPaneSize Normally the paned widget makes a QueryGeometry call on a child to determine the preferred size of the child's pane. There are times when the application programmer or the user has a better idea of the preferred size of a pane. Setting this resource causes the value passed to be interpreted as the preferred size, in pixels, of this pane. resizeToPreferred Determines whether or not to resize each pane to its preferred size when the Paned widget is resized. See Layout Semantics for details. showGrip If True then a grip will be shown for this pane. The grip associated with a pane is either below or to the right of the pane. No grip is ever shown for the last pane. skipAdjust This resource is used to determine which pane is forced to be resized. Setting this value to True makes this pane less likely to be forced to be resized. See Layout Semantics for details. In order to make effective use of the Paned widget it is helpful to know the rules it uses to determine which child will be resized in any given situation. There are three rules used to determine which child is resized. While these rules are always the same, the panes that are searched can change depending upon what caused the relayout. Layout Rules 1 Do not let a pane grow larger than its max or smaller than its min. 2 Do not adjust panes with skipAdjust set. 3 Do not adjust panes away from their preferred size, although moving one closer to its preferred size is fine. When searching the children the Paned widget looks for panes that satisfy all the rules, and if unsuccessful then it eliminates rule 3 and then 2. Rule 1 is always enforced. If the relayout is due to a resize or change in management then the panes are searched from bottom to top. If the relayout is due to grip movement then they are searched from the grip selected in the direction opposite the pane selected. The pane above the grip is resized by invoking the GripAction with UpLeftPane specified. The panes below the grip are each checked against all rules, then rules 2 and 1 and finally against rule 1 only. No pane above the chosen pane will ever be resized. The pane below the grip is resized by invoking the GripAction with LowRightPane specified. The panes above the grip are each checked in this case. No pane below the chosen pane will ever be resized. Invoking GripAction with ThisBorderOnly specified just moves the border between the panes. No other panes are ever resized. When the Pane widget is resized it must determine a new size for each pane. There are two methods of doing this. The Paned widget can either give each pane its preferred size and then resize the panes to fit, or it can use the current sizes and then resize the panes to fit. The resizeToPreferred resource allows the application to tell the Paned widget whether to query the child about its preferred size (subject to the the preferredPaneSize) or to use the current size when refiguring the pane locations after the pane has been resized. There is one special case. All panes assume they should resize to their preferred size until the Paned widget becomes visible to the user. The Paned widget always resizes its children to their preferred sizes when a new child is managed, or a geometry management request is honored. The Paned widget will first attempt to resize itself to contain its panes exactly. If this is not possible then it will hunt through the children, from bottom to top (right to left), for a pane to resize. When a user resizes a pane with the grips, the Paned widget assumes that this new size is the preferred size of the pane. The Paned widget has no action routines of its own, as all actions are handled through the grips. The grips are each assigned a default Translation table. <Btn1Down>: GripAction(Start, UpLeftPane) <Btn2Down>: GripAction(Start, ThisBorderOnly) <Btn3Down>: GripAction(Start, LowRightPane) <Btn1Motion>: GripAction(Move, UpLeftPane) <Btn2Motion>: GripAction(Move, ThisBorderOnly) <Btn3Motion>: GripAction(Move, LowRightPane) Any<BtnUp>: GripAction(Commit) The Paned widget interprets the GripAction as taking two arguments. The first argument may be any of the following: Start Sets up the Paned widget for resizing and changes the cursor of the grip. The second argument determines which pane will be resized, and can take on any of the three values shown above. Move The internal borders are drawn over the current pane locations to animate where the borders would actually be placed if you were to move this border as shown. The second argument must match the second argument that was passed to the Start action, that began this process. If these arguments are not passed, the behavior is undefined. Commit This argument causes the Paned widget to commit the changes selected by the previously started action. The cursor is changed back to the grip's inactive cursor. No second argument is needed in this case. To enable or disable a child's request for pane resizing, use XawPanedAllowResize : void XawPanedAllowResize Widget w Boolean allow_resize w Specifies the child pane. allow_resize Specifies whether or not resizing requests for this child will be granted by the Paned widget. If allow_resize is True, the Paned widget allows geometry requests from the child to change the pane's height. If allow_resize is False, the Paned widget ignores geometry requests from the child to change the pane's height. The default state is True before the Pane is realized and False after it is realized. This procedure is equivalent to changing the allowResize constraint resource for the child. To change the minimum and maximum height settings for a pane, use XawPanedSetMinMax : void XawPanedSetMinMax Widget w intmin, max w Specifies the child pane. min Specifies the new minimum height of the child, expressed in pixels. max Specifies new maximum height of the child, expressed in pixels. This procedure is equivalent to setting the min and max constraint resources for the child. To retrieve the minimum and maximum height settings for a pane, use XawPanedGetMinMax : void XawPanedGetMinMax Widget w int*min_return, *max_return w Specifies the child pane. min_return Returns the minimum height of the child, expressed in pixels. max_return Returns the maximum height of the child, expressed in pixels. This procedure is equivalent to getting the min and max resources for this child child. To enable or disable automatic recalculation of pane sizes and positions, use XawPanedSetRefigureMode : void XawPanedSetRefigureMode Widget w Boolean mode w Specifies the Paned widget. mode Specifies whether the layout of the Paned widget is enabled (True) or disabled (False). When making several changes to the children of a Paned widget after the Paned has been realized, it is a good idea to disable relayout until after all changes have been made. To retrieve the number of panes in a paned widget use XawPanedGetNumSub: int XawPanedGetNumSub Widget w w Specifies the Paned widget. This function returns the number of panes in the Paned widget. This is not the same as the number of children, since the grips are also children of the Paned widget.