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com.vaadin.client.renderers.

Class HierarchyRenderer

  • All Implemented Interfaces:

    com.google.gwt.event.dom.client.ClickHandler, com.google.gwt.event.shared.EventHandler, Renderer<Object>

    public class HierarchyRenderer
extends ClickableRenderer<Object,​com.google.gwt.user.client.ui.Widget>

    A renderer for displaying hierarchical columns in TreeGrid.

    Since:

    8.1

    Author:

    Vaadin Ltd

    • Constructor Detail

      • HierarchyRenderer

        public HierarchyRenderer​(BiConsumer<Integer,​Boolean> collapseCallback,
                         String styleName)

        Constructs a HierarchyRenderer with given collapse callback. Callback is called when user clicks on the expander of a row. Callback is given the row index and the target collapsed state.

        Parameters:

        collapseCallback - the callback for collapsing nodes with row index

        styleName - the style name of the widget this renderer is used in

    • Method Detail

      • setStyleNames

        public void setStyleNames​(String styleName)

        Set the style name prefix for the node, expander and cell-content elements.

        Parameters:

        styleName - the style name to set

      • createWidget

        public com.google.gwt.user.client.ui.Widget createWidget()

        Description copied from class: ClickableRenderer

        Creates a widget to attach to a cell. The widgets will be attached to the cell after the cell element has been attached to DOM.

        Implementation note: It is the implementing method's responsibility to add this as a click handler of the returned widget, or a widget nested therein, in order to make click events propagate properly to handlers registered via addClickHandler.

        Specified by:

        createWidget in class ClickableRenderer<Object,​com.google.gwt.user.client.ui.Widget>

        Returns:

        widget to attach to a cell. All returned instances should be new widget instances without a parent.

      • render

        public void render​(RendererCellReference cell,
                   Object data,
                   com.google.gwt.user.client.ui.Widget widget)

        Description copied from class: WidgetRenderer

        Renders a cell with a widget. This provides a way to update any information in the widget that is cell specific. Do not detach the Widget here, it will be done automatically by the Grid when the widget is no longer needed.

        For optimal performance, work done in this method should be kept to a minimum since it will be called continuously while the user is scrolling. The renderer can use Widget.setLayoutData(Object) to store cell data that might be needed in e.g. event listeners.

        Specified by:

        render in class WidgetRenderer<Object,​com.google.gwt.user.client.ui.Widget>

        Parameters:

        cell - The cell to render. Note that the cell is a flyweight and should not be stored and used outside of this method as its contents will change.

        data - the data of the cell

        widget - the widget embedded in the cell

      • setInnerRenderer

        public void setInnerRenderer​(Renderer innerRenderer)

        Sets the renderer to be wrapped. This is the original renderer before hierarchy is applied.

        Parameters:

        innerRenderer - Renderer to be wrapped.

      • getInnerRenderer

        public Renderer getInnerRenderer()

        Returns the wrapped renderer.

        Returns:

        Wrapped renderer.

      • isElementInHierarchyWidget

        public static boolean isElementInHierarchyWidget​(com.google.gwt.dom.client.Element element)

        Decides whether the element was rendered by HierarchyRenderer.

        Parameters:

        element - the element to check

        Returns:

        true if the element was rendered by a HierarchyRenderer, false otherwise.