Package com.google.gwt.cell.client

Class CompositeCell<C>

java.lang.Object
com.google.gwt.cell.client.AbstractCell<C>
com.google.gwt.cell.client.CompositeCell<C>
Type Parameters:
C - the type that this Cell represents
All Implemented Interfaces:
Cell<C>
public class CompositeCell<C> extends AbstractCell<C>

A Cell that is composed of other Cells.

When this cell is rendered, it will render each component Cell inside a span. If the component Cell uses block level elements (such as a Div), the component cells will stack vertically.

  • Constructor Details

    • CompositeCell

      public CompositeCell(List<HasCell<C,?>> hasCells)
      Construct a new CompositeCell.
      Parameters:
      hasCells - the cells that makeup the composite

  • Method Details

    • dependsOnSelection

      public boolean dependsOnSelection()
      Description copied from interface: Cell
      Check if this cell depends on the selection state.
      Specified by:
      dependsOnSelection in interface Cell<C>
      Overrides:
      dependsOnSelection in class AbstractCell<C>
      Returns:
      true if dependent on selection, false if not

    • getConsumedEvents

      public Set<String> getConsumedEvents()
      Description copied from interface: Cell
      Get the set of events that this cell consumes (see BrowserEvents for useful constants). The container that uses this cell should only pass these events to Cell.onBrowserEvent(Context, Element, Object, NativeEvent, ValueUpdater) when the event occurs.

      The returned value should not be modified, and may be an unmodifiable set. Changes to the return value may not be reflected in the cell.

      Specified by:
      getConsumedEvents in interface Cell<C>
      Overrides:
      getConsumedEvents in class AbstractCell<C>
      Returns:
      the consumed events, or null if no events are consumed
      See Also:

    • handlesSelection

      public boolean handlesSelection()
      Description copied from interface: Cell
      Check if this cell handles selection. If the cell handles selection, then its container should not automatically handle selection.
      Specified by:
      handlesSelection in interface Cell<C>
      Overrides:
      handlesSelection in class AbstractCell<C>
      Returns:
      true if the cell handles selection, false if not

    • isEditing

      public boolean isEditing(Cell.Context context, Element parent, C value)
      Description copied from class: AbstractCell
      Returns false. Subclasses that support editing should override this method to return the current editing status.
      Specified by:
      isEditing in interface Cell<C>
      Overrides:
      isEditing in class AbstractCell<C>
      Parameters:
      context - the Cell.Context of the cell
      parent - the parent Element
      value - the value associated with the cell
      Returns:
      true if the cell is in edit mode

    • onBrowserEvent

      public void onBrowserEvent(Cell.Context context, Element parent, C value, NativeEvent event, ValueUpdater<C> valueUpdater)
      Description copied from class: AbstractCell
      Handle a browser event that took place within the cell. The default implementation returns null.

      If you override this method to add support for events, remember to pass the event types that the cell expects into the constructor.

      Specified by:
      onBrowserEvent in interface Cell<C>
      Overrides:
      onBrowserEvent in class AbstractCell<C>
      Parameters:
      context - the Cell.Context of the cell
      parent - the parent Element
      value - the value associated with the cell
      event - the native browser event
      valueUpdater - a ValueUpdater, or null if not specified

    • render

      public void render(Cell.Context context, C value, SafeHtmlBuilder sb)
      Description copied from interface: Cell
      Render a cell as HTML into a SafeHtmlBuilder, suitable for passing to Element.setInnerHTML(String) on a container element.

      Note: If your cell contains natively focusable elements, such as buttons or input elements, be sure to set the tabIndex to -1 so that they do not steal focus away from the containing widget.

      Specified by:
      render in interface Cell<C>
      Specified by:
      render in class AbstractCell<C>
      Parameters:
      context - the Cell.Context of the cell
      value - the cell value to be rendered
      sb - the SafeHtmlBuilder to be written to

    • resetFocus

      public boolean resetFocus(Cell.Context context, Element parent, C value)
      Description copied from class: AbstractCell
      Reset focus on the Cell. This method is called if the cell has focus when it is refreshed.

      This method is a no-op and returns false. If your cell is editable or can be focused by the user, override this method to reset focus when the containing widget is refreshed.

      Specified by:
      resetFocus in interface Cell<C>
      Overrides:
      resetFocus in class AbstractCell<C>
      Parameters:
      context - the Cell.Context of the cell
      parent - the parent Element
      value - the value associated with the cell
      Returns:
      true if focus is taken, false if not

    • setValue

      public void setValue(Cell.Context context, Element parent, C object)
      Description copied from interface: Cell
      This method may be used by cell containers to set the value on a single cell directly, rather than using Element.setInnerHTML(String). See AbstractCell.setValue(Context, Element, Object) for a default implementation that uses Cell.render(Context, Object, SafeHtmlBuilder).
      Specified by:
      setValue in interface Cell<C>
      Overrides:
      setValue in class AbstractCell<C>
      Parameters:
      context - the Cell.Context of the cell
      parent - the parent Element
      object - the value associated with the cell

    • getHasCells

      public List<HasCell<C,?>> getHasCells()
      Returns the readonly list of HasCell's that make up this composite.

    • getContainerElement

      protected Element getContainerElement(Element parent)
      Get the element that acts as the container for all children. If children are added directly to the parent, the parent is the container. If children are added in a table row, the row is the parent.
      Parameters:
      parent - the parent element of the cell
      Returns:
      the container element

    • render

      protected <X> void render(Cell.Context context, C value, SafeHtmlBuilder sb, HasCell<C,X> hasCell)
      Render the composite cell as HTML into a SafeHtmlBuilder, suitable for passing to Element.setInnerHTML(java.lang.String) on a container element.

      Note: If your cell contains natively focusable elements, such as buttons or input elements, be sure to set the tabIndex to -1 so that they do not steal focus away from the containing widget.

      Parameters:
      context - the Context of the cell
      value - the cell value to be rendered
      sb - the SafeHtmlBuilder to be written to
      hasCell - a HasCell instance containing the cells to be rendered within this cell