/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.uberfire.client.views.pfly.dropdown;
import java.util.Iterator;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.ui.ComplexPanel;
import com.google.gwt.user.client.ui.Widget;
import org.gwtbootstrap3.client.ui.Button;
import org.gwtbootstrap3.client.ui.DropDown;
import org.gwtbootstrap3.client.ui.DropDownMenu;
import org.gwtbootstrap3.client.ui.ListItem;
import org.gwtbootstrap3.client.ui.constants.ButtonType;
import org.gwtbootstrap3.client.ui.constants.Toggle;
/**
* Utility component for creating dropdown menus.
* It also allows to determine if dropdown should shown when there is a single element in the list.
*/
public class ListDropdown extends DropDown {
protected Button button = GWT.create(Button.class);
protected DropDownMenu dropDownMenu = GWT.create(DropDownMenu.class);
protected boolean hideOnSingleElement = true;
public ListDropdown() {
super.add(button);
super.add(dropDownMenu);
button.setType(ButtonType.LINK);
this.addStyleName("uf-list-dropdown");
}
@Override
public void add(final Widget child) {
if (child instanceof ListItem) {
dropDownMenu.add(child);
addCaretToText();
}
}
public void setText(final Widget text) {
removeChildWidgets(button);
button.add(text);
addCaretToText();
}
@Override
public boolean remove(final Widget w) {
final boolean remove = dropDownMenu.remove(w);
addCaretToText();
return remove;
}
public void setHideOnSingleElement(boolean hide) {
this.hideOnSingleElement = hide;
}
@Override
public void clear() {
removeChildWidgets(button);
removeChildWidgets(dropDownMenu);
}
private void removeChildWidgets(final ComplexPanel panel) {
final Iterator<Widget> iterator = panel.iterator();
while (iterator.hasNext()) {
iterator.next();
iterator.remove();
}
}
/**
* Checks whether or not caret should be added/removed
*/
protected void addCaretToText() {
if (hideOnSingleElement && dropDownMenu.getWidgetCount() == 1) {
button.setToggleCaret(false);
button.setDataToggle(null);
this.removeStyleName("open");
toggleStyles(true);
} else if ((dropDownMenu.getWidgetCount() > 1 || hideOnSingleElement == false && dropDownMenu.getWidgetCount() == 1)) {
button.setToggleCaret(true);
button.setDataToggle(Toggle.DROPDOWN);
button.setDataTargetWidget(this);
toggleStyles(false);
}
}
private void toggleStyles(boolean single) {
this.removeStyleName("uf-list-dropdown-single");
this.removeStyleName("uf-list-dropdown-multi");
this.addStyleName(single ? "uf-list-dropdown-single" : "uf-list-dropdown-multi");
}
}