Package org.eclipse.jface.layout

Class TreeColumnLayout

java.lang.Object
org.eclipse.swt.widgets.Layout
org.eclipse.jface.layout.AbstractColumnLayout
org.eclipse.jface.layout.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 Details

    • 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 Details

    • 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