/**
 * Initialize the ComboBoxMultiselect with default settings and register client to server RPC implementation.
 */
private void init() {
    registerRpc(this.rpc);
    registerRpc(new FocusAndBlurServerRpcDecorator(this, this::fireEvent));

    addDataGenerator((final T data, final JsonObject jsonObject) -> {
        String caption = getItemCaptionGenerator().apply(data);
        if (caption == null) {
            caption = "";
        }
        jsonObject.put(DataCommunicatorConstants.NAME, caption);
        final String style = this.itemStyleGenerator.apply(data);
        if (style != null) {
            jsonObject.put(ComboBoxMultiselectConstants.STYLE, style);
        }
        final Resource icon = getItemIconGenerator().apply(data);
        if (icon != null) {
            final String iconUrl = ResourceReference.create(icon, ComboBoxMultiselect.this, null)
                    .getURL();
            jsonObject.put(ComboBoxMultiselectConstants.ICON, iconUrl);
        }
    });
}
 

/**
 * Initialize the ComboBoxMultiselect with default settings and register client to server RPC implementation.
 */
private void init() {
    registerRpc(this.rpc);
    registerRpc(new FocusAndBlurServerRpcDecorator(this, this::fireEvent));

    addDataGenerator((final T data, final JsonObject jsonObject) -> {
        String caption = getItemCaptionGenerator().apply(data);
        if (caption == null) {
            caption = "";
        }
        jsonObject.put(DataCommunicatorConstants.NAME, caption);
        final String style = this.itemStyleGenerator.apply(data);
        if (style != null) {
            jsonObject.put(ComboBoxMultiselectConstants.STYLE, style);
        }
        final Resource icon = getItemIconGenerator().apply(data);
        if (icon != null) {
            final String iconUrl = ResourceReference.create(icon, ComboBoxMultiselect.this, null)
                    .getURL();
            jsonObject.put(ComboBoxMultiselectConstants.ICON, iconUrl);
        }
    });
}
 

private List<ContextMenuItemState> convertItemsToState(List<MenuItem> items,
                                                       Map<Integer, MenuItem> itemRegistry) {
    if (items == null || items.size() == 0) {
        return null;
    }

    List<ContextMenuItemState> stateItems = new ArrayList<>(items.size());

    for (MenuItem item : items) {
        ContextMenuItemState menuItemState = new ContextMenuItemState();

        if (!item.isVisible()) {
            continue;
        }

        menuItemState.id = item.getId();
        menuItemState.text = item.getText();
        menuItemState.checkable = item.isCheckable();
        menuItemState.command = item.getCommand() != null;
        menuItemState.checked = item.isChecked();
        menuItemState.description = item.getDescription();
        menuItemState.descriptionContentMode = item
                .getDescriptionContentMode();
        menuItemState.enabled = item.isEnabled();
        menuItemState.separator = item.isSeparator();
        menuItemState.icon = ResourceReference.create(item.getIcon(), this,
                "");
        menuItemState.styleName = item.getStyleName();

        menuItemState.childItems = convertItemsToState(item.getChildren(),
                itemRegistry);

        stateItems.add(menuItemState);
        itemRegistry.put(item.getId(), item);
    }

    return stateItems;
}
 

@Override
public JsonValue encode(Resource value) {
    ResourceReference resourceReference = ResourceReference.create(value, this, ComponentConstants.ICON_RESOURCE);
    return super.encode(resourceReference, URLReference.class);
}
 

private List<ContextMenuItemState> convertItemsToState(List<MenuItem> items,
        Map<Integer, MenuItem> itemRegistry) {
    if (items == null || items.size() == 0) {
        return null;
    }

    List<ContextMenuItemState> stateItems = new ArrayList<>(items.size());

    for (MenuItem item : items) {
        ContextMenuItemState menuItemState = new ContextMenuItemState();

        if (!item.isVisible()) {
            continue;
        }

        menuItemState.id = item.getId();
        menuItemState.text = item.getText();
        menuItemState.checkable = item.isCheckable();
        menuItemState.command = item.getCommand() != null;
        menuItemState.checked = item.isChecked();
        menuItemState.description = item.getDescription();
        menuItemState.descriptionContentMode = item
                .getDescriptionContentMode();
        menuItemState.enabled = item.isEnabled();
        menuItemState.separator = item.isSeparator();
        String key= item.getIcon()!= null ?
                String.valueOf(item.getIcon().hashCode())
                : "icon";
        ResourceReference resourceReference = ResourceReference.create(item.getIcon(), this, key);
        if (item.getIcon()!=null && (item.getIcon() instanceof ConnectorResource)) {
            super.getState().resources.put(key,resourceReference);
        }
        menuItemState.icon = resourceReference;
        menuItemState.styleName = item.getStyleName();

        menuItemState.childItems = convertItemsToState(item.getChildren(),
                itemRegistry);

        stateItems.add(menuItemState);
        itemRegistry.put(item.getId(), item);
    }

    return stateItems;
}