Class TreeColumnLayout


  • public class TreeColumnLayout
    extends AbstractColumnLayout
    The TreeColumnLayout is the Layout used to maintain TreeColumn sizes in a Tree.

    You can only add the Layout to a container whose only child is the Tree control you want the Layout applied to. Don't assign the layout directly the Tree

    Since:
    3.3
    • Constructor Detail

      • TreeColumnLayout

        public TreeColumnLayout()
        Creates a new tree column layout.
      • TreeColumnLayout

        public TreeColumnLayout​(boolean adjustForScrollBar)
        Creates a new tree column layout.
        Parameters:
        adjustForScrollBar - true if the layout should reserve space for the vertical scroll bar
        Since:
        3.12
    • Method Detail

      • layout

        protected void layout​(Composite composite,
                              boolean flushCache)
        Description copied from class: Layout
        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.

        Overrides:
        layout in class AbstractColumnLayout
        Parameters:
        composite - a composite widget using this layout
        flushCache - true means flush cached layout values
      • getColumnCount

        protected int getColumnCount​(Scrollable tree)
        Get the number of columns for the receiver.
        Specified by:
        getColumnCount in class AbstractColumnLayout
        Parameters:
        tree - the control
        Returns:
        the number of columns
        Since:
        3.5
      • setColumnWidths

        protected void setColumnWidths​(Scrollable tree,
                                       int[] widths)
        Set the widths of the columns.
        Specified by:
        setColumnWidths in class AbstractColumnLayout
        Parameters:
        tree - the control
        widths - the widths of the column
        Since:
        3.5
      • getLayoutData

        protected ColumnLayoutData getLayoutData​(Scrollable tableTree,
                                                 int columnIndex)
        Get the layout data for a column
        Specified by:
        getLayoutData in class AbstractColumnLayout
        Parameters:
        tableTree - the control
        columnIndex - the column index
        Returns:
        the layout data, might not null
        Since:
        3.5
      • updateColumnData

        protected void updateColumnData​(Widget column)
        Update the layout data for a column
        Specified by:
        updateColumnData in class AbstractColumnLayout
        Parameters:
        column - the column
        Since:
        3.5