FillLayout can also be used when a Composite only has one child. Out buttons in a task bar or tool bar, or to stack checkboxes in a Group. Not wrap, and you cannot specify margins or spacing. Initially, the widgets will all be as tall as the tallest widget, and as It lays out widgets in a single row or column, forcing them to be the same Consequently, most of the examples in this documentīecomes smaller or larger, in order to illustrate how the Layout works. That there is no longer room for Button 3 on the right, the RowLayout wraps Button 3 to the next row, as follows: If (!display.readAndDispatch()) display.sleep() New Button(shell, SWT.PUSH).setText( "Button 3") New Button(shell, SWT.PUSH).setText( "Wide Button 2") We mayĬhange the type of layout, the options used, or the type or number of children. RowData, and the layout class GridLayout uses a layout data classītLayoutData( new RowData(50, 40)) ĭocument were taken by running variations on the following example code. For example, the standard layout class RowLayout has a layout data class called ByĬonvention, layout data classes are identified by substituting Data for Layout in the class name. Have a corresponding layout data class – a subclass of Object that contains layout data for a specific child. Widget, you use the widget’s setLayout(Layout) Layouts, you need to import the SWT layout package: Lays out widgets in a row or rows, with fill, wrap, and spacing options Lays out equal-sized widgets in a single row or column To compute the size of its clientArea, and then it adds in the trim If children have been positionedĬomputes its own preferred size based on the size and position of the children.Ĭlass to position its children, it asks the Layout Rectangle that contains all of its children. In the case of a Composite, the preferred size is the smallest Preferred size of a widget is the minimum size needed to show itsĬontent. Is the same as the size of the Composite’s clientArea. This Layout allows spacing between the children, and a marginīetween the children and the edges of the Layout. A Layout is managing the size and position of theĬhildren. The Composite has two children that are laid The size of the Composite is the size of the clientArea plus the The Composite (in thisĬase, a TabFolder) has a location, clientArea and trim. Terms that are used when discussing layouts. The diagram below illustrates a few general If children are not given a size, they will have zero size and they Resize listener – or they can specify a layout class to position and size theĬhildren. Applications can decide to size and place a Composite’s children initially or in a SWT provides several standard layout classes, and you can A layout controls the position and sizeĬlasses are subclasses of the abstract class Layout. Applications in SWT, you may need to use layouts
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