Class Layout

    • Constructor Summary

      Constructors 
      Constructor Description
      Layout()  
    • Method Summary

      All Methods Instance Methods Abstract Methods Concrete Methods 
      Modifier and Type Method Description
      protected abstract Point computeSize​(Composite composite, int wHint, int hHint, boolean flushCache)
      Computes and returns the size of the specified composite's client area according to this layout.
      protected boolean flushCache​(Control control)
      Instruct the layout to flush any cached values associated with the control specified in the argument control.
      protected abstract void layout​(Composite composite, boolean flushCache)
      Lays out the children of the specified composite according to this layout.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • Layout

        public Layout()
    • Method Detail

      • layout

        protected abstract void layout​(Composite composite,
                                       boolean flushCache)
        Lays out the children of the specified composite according to this layout.

        This method positions and sizes the children of a composite using the layout algorithm encoded by this layout. Children of the composite are positioned in the client area of the composite. The position of the composite is not altered by this method.

        When the flush cache hint is true, the layout is instructed to flush any cached values associated with the children. Typically, a layout will cache the preferred sizes of the children to avoid the expense of computing these values each time the widget is laid out.

        When layout is triggered explicitly by the programmer the flush cache hint is true. When layout is triggered by a resize, either caused by the programmer or by the user, the hint is false.

        Parameters:
        composite - a composite widget using this layout
        flushCache - true means flush cached layout values
      • flushCache

        protected boolean flushCache​(Control control)
        Instruct the layout to flush any cached values associated with the control specified in the argument control.
        Parameters:
        control - a control managed by this layout
        Returns:
        true if the Layout has flushed all cached information associated with control
      • computeSize

        protected abstract Point computeSize​(Composite composite,
                                             int wHint,
                                             int hHint,
                                             boolean flushCache)
        Computes and returns the size of the specified composite's client area according to this layout.

        This method computes the size that the client area of the composite must be in order to position all children at their preferred size inside the composite according to the layout algorithm encoded by this layout.

        When a width or height hint is supplied, it is used to constrain the result. For example, if a width hint is provided that is less than the width of the client area, the layout may choose to wrap and increase height, clip, overlap, or otherwise constrain the children.

        Parameters:
        composite - a composite widget using this layout
        wHint - width (SWT.DEFAULT for preferred size)
        hHint - height (SWT.DEFAULT for preferred size)
        flushCache - true means flush cached layout values
        Returns:
        a point containing the computed size (width, height)
        See Also:
        layout(org.eclipse.swt.widgets.Composite, boolean), Control.getBorderWidth(), Control.getBounds(), Control.getSize(), Control.pack(boolean), "computeTrim, getClientArea for controls that implement them"