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- /*
- * Copyright 2000-2018 Vaadin Ltd.
- *
- * 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 com.vaadin.ui;
-
- import com.vaadin.ui.HasComponents.ComponentAttachDetachNotifier;
-
- /**
- * Interface for component containers that have one child component and do not
- * support adding or removing components.
- *
- * For component containers that support multiple children, see
- * {@link ComponentContainer} instead.
- *
- * @since 7.0
- */
- public interface SingleComponentContainer
- extends HasComponents, ComponentAttachDetachNotifier {
-
- /**
- * Gets the number of children this {@link SingleComponentContainer} has.
- * This must be symmetric with what {@link #iterator()} returns and thus
- * typically return 1 if the content is set, 0 otherwise.
- *
- * @return The number of child components this container has.
- */
- public int getComponentCount();
-
- /**
- * Gets the content of this container. The content is a component that
- * serves as the outermost item of the visual contents.
- *
- * @return a component to use as content
- *
- * @see #setContent(Component)
- */
- public Component getContent();
-
- /**
- * Sets the content of this container. The content is a component that
- * serves as the outermost item of the visual contents.
- *
- * The content should always be set, either as a constructor parameter or by
- * calling this method.
- *
- */
- public void setContent(Component content);
-
- }
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