Class CheckboxTableViewer

  • All Implemented Interfaces:
    ICheckable, IInputProvider, IInputSelectionProvider, IPostSelectionProvider, ISelectionProvider

    public class CheckboxTableViewer
    extends TableViewer
    implements ICheckable
    A concrete viewer based on an SWT Table control with checkboxes on each node.

    This class supports setting an ICheckStateProvider to set the checkbox states. To see standard SWT behavior, view SWT Snippet274.

    This class is not intended to be subclassed outside the viewer framework. It is designed to be instantiated with a pre-existing SWT table control and configured with a domain-specific content provider, label provider, element filter (optional), and element sorter (optional).

    Restriction:
    This class is not intended to be subclassed by clients.
    • Constructor Detail

      • CheckboxTableViewer

        @Deprecated
        public CheckboxTableViewer​(Composite parent)
        Deprecated.
        use newCheckList(Composite, int) or new CheckboxTableViewer(Table) instead (see below for details)
        Creates a table viewer on a newly-created table control under the given parent. The table control is created using the SWT style bits: SWT.CHECK and SWT.BORDER. The table has one column. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.

        This is equivalent to calling new CheckboxTableViewer(parent, SWT.BORDER). See that constructor for more details.

        Parameters:
        parent - the parent control
      • CheckboxTableViewer

        @Deprecated
        public CheckboxTableViewer​(Composite parent,
                                   int style)
        Deprecated.
        use newCheckList(Composite, int) or new CheckboxTableViewer(Table) instead (see above for details)
        Creates a table viewer on a newly-created table control under the given parent. The table control is created using the given SWT style bits, plus the SWT.CHECK style bit. The table has one column. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.

        This also adds a TableColumn for the single column, and sets a TableLayout on the table which sizes the column to fill the table for its initial sizing, but does nothing on subsequent resizes.

        If the caller just needs to show a single column with no header, it is preferable to use the newCheckList factory method instead, since SWT properly handles the initial sizing and subsequent resizes in this case.

        If the caller adds its own columns, uses Table.setHeadersVisible(true), or needs to handle dynamic resizing of the table, it is recommended to create the Table itself, specifying the SWT.CHECK style bit (along with any other style bits needed), and use new CheckboxTableViewer(Table) rather than this constructor.

        Parameters:
        parent - the parent control
        style - SWT style bits
      • CheckboxTableViewer

        public CheckboxTableViewer​(Table table)
        Creates a table viewer on the given table control. The SWT.CHECK style bit must be set on the given table control. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.
        Parameters:
        table - the table control
    • Method Detail

      • newCheckList

        public static CheckboxTableViewer newCheckList​(Composite parent,
                                                       int style)
        Creates a table viewer on a newly-created table control under the given parent. The table control is created using the given SWT style bits, plus the SWT.CHECK style bit. The table shows its contents in a single column, with no header. The viewer has no input, no content provider, a default label provider, no sorter, and no filters.

        No TableColumn is added. SWT does not require a TableColumn if showing only a single column with no header. SWT correctly handles the initial sizing and subsequent resizes in this case.

        Parameters:
        parent - the parent control
        style - SWT style bits
        Returns:
        CheckboxTableViewer
        Since:
        2.0
      • addCheckStateListener

        public void addCheckStateListener​(ICheckStateListener listener)
        Description copied from interface: ICheckable
        Adds a listener for changes to the checked state of elements in this viewer. Has no effect if an identical listener is already registered.
        Specified by:
        addCheckStateListener in interface ICheckable
        Parameters:
        listener - a check state listener
      • setCheckStateProvider

        public void setCheckStateProvider​(ICheckStateProvider checkStateProvider)
        Sets the ICheckStateProvider for this CheckboxTreeViewer. The check state provider will supply the logic for deciding whether the check box associated with each item should be checked, grayed or unchecked.
        Parameters:
        checkStateProvider - The provider.
        Since:
        3.5
      • doUpdateItem

        protected void doUpdateItem​(Widget widget,
                                    Object element,
                                    boolean fullMap)
        Description copied from class: StructuredViewer
        Copies the attributes of the given element into the given SWT item. The element map is updated according to the value of fullMap. If fullMap is true then the current mapping from element to widgets is removed and the new mapping is added. If full map is false then only the new map gets installed. Installing only the new map is necessary in cases where only the order of elements changes but not the set of elements.

        This method is internal to the framework; subclassers should not call this method.

        Overrides:
        doUpdateItem in class AbstractTableViewer
        element - element
        fullMap - true if mappings are added and removed, and false if only the new map gets installed
      • createTable

        protected static Table createTable​(Composite parent,
                                           int style)
        Creates a new table control with one column.
        Parameters:
        parent - the parent control
        style - style bits
        Returns:
        a new table control
      • getChecked

        public boolean getChecked​(Object element)
        Description copied from interface: ICheckable
        Returns the checked state of the given element.
        Specified by:
        getChecked in interface ICheckable
        Parameters:
        element - the element
        Returns:
        true if the element is checked, and false if not checked
      • getCheckedElements

        public Object[] getCheckedElements()
        Returns a list of elements corresponding to checked table items in this viewer.

        This method is typically used when preserving the interesting state of a viewer; setCheckedElements is used during the restore.

        Returns:
        the array of checked elements
        See Also:
        setCheckedElements(java.lang.Object[])
      • getGrayed

        public boolean getGrayed​(Object element)
        Returns the grayed state of the given element.
        Parameters:
        element - the element
        Returns:
        true if the element is grayed, and false if not grayed
      • getGrayedElements

        public Object[] getGrayedElements()
        Returns a list of elements corresponding to grayed nodes in this viewer.

        This method is typically used when preserving the interesting state of a viewer; setGrayedElements is used during the restore.

        Returns:
        the array of grayed elements
        See Also:
        setGrayedElements(java.lang.Object...)
      • handleSelect

        public void handleSelect​(SelectionEvent event)
        Description copied from class: StructuredViewer
        Handles a select event from the widget.

        This method is internal to the framework; subclassers should not call this method.

        Overrides:
        handleSelect in class StructuredViewer
        Parameters:
        event - the SWT selection event
      • preservingSelection

        protected void preservingSelection​(Runnable updateCode)
        Description copied from class: StructuredViewer
        Attempts to preserves the current selection across a run of the given code. This method should not preserve the selection if {link #getPreserveSelection()} returns false.

        The default implementation of this method:

        • discovers the old selection (via getSelection)
        • runs the given runnable
        • attempts to restore the old selection (using setSelectionToWidget
        • rediscovers the resulting selection (via getSelection)
        • calls handleInvalidSelection if the resulting selection is different from the old selection
        Overrides:
        preservingSelection in class StructuredViewer
        Parameters:
        updateCode - the code to run see #getPreserveSelection()
      • removeCheckStateListener

        public void removeCheckStateListener​(ICheckStateListener listener)
        Description copied from interface: ICheckable
        Removes the given check state listener from this viewer. Has no effect if an identical listener is not registered.
        Specified by:
        removeCheckStateListener in interface ICheckable
        Parameters:
        listener - a check state listener
      • setAllChecked

        public void setAllChecked​(boolean state)
        Sets to the given value the checked state for all elements in this viewer. Does not fire events to check state listeners.
        Parameters:
        state - true if the element should be checked, and false if it should be unchecked
      • setAllGrayed

        public void setAllGrayed​(boolean state)
        Sets to the given value the grayed state for all elements in this viewer.
        Parameters:
        state - true if the element should be grayed, and false if it should be ungrayed
      • setChecked

        public boolean setChecked​(Object element,
                                  boolean state)
        Description copied from interface: ICheckable
        Sets the checked state for the given element in this viewer. Does not fire events to check state listeners.
        Specified by:
        setChecked in interface ICheckable
        Parameters:
        element - the element
        state - true if the item should be checked, and false if it should be unchecked
        Returns:
        true if the checked state could be set, and false otherwise
      • setCheckedElements

        public void setCheckedElements​(Object[] elements)
        Sets which nodes are checked in this viewer. The given list contains the elements that are to be checked; all other nodes are to be unchecked. Does not fire events to check state listeners.

        This method is typically used when restoring the interesting state of a viewer captured by an earlier call to getCheckedElements.

        Parameters:
        elements - the list of checked elements (element type: Object)
        See Also:
        getCheckedElements()
      • setGrayed

        public boolean setGrayed​(Object element,
                                 boolean state)
        Sets the grayed state for the given element in this viewer.
        Parameters:
        element - the element
        state - true if the item should be grayed, and false if it should be ungrayed
        Returns:
        true if the element is visible and the gray state could be set, and false otherwise
      • setGrayedElements

        public void setGrayedElements​(Object... elements)
        Sets which nodes are grayed in this viewer. The given list contains the elements that are to be grayed; all other nodes are to be ungrayed.

        This method is typically used when restoring the interesting state of a viewer captured by an earlier call to getGrayedElements.

        Parameters:
        elements - the array of grayed elements
        See Also:
        getGrayedElements()