CanvasViewer.java

/*
 * Copyright 2017 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.kie.workbench.common.stunner.client.widgets.presenters.canvas;

import com.google.gwt.user.client.ui.IsWidget;
import org.kie.workbench.common.stunner.client.widgets.presenters.Viewer;
import org.kie.workbench.common.stunner.core.client.canvas.Canvas;
import org.kie.workbench.common.stunner.core.client.canvas.CanvasHandler;
import org.kie.workbench.common.stunner.core.client.canvas.controls.zoom.ZoomControl;

/**
 * A viewer type for generic instances based on any subtypes for <code>Canvas</code> view types and <code>CanvasHandler</code> types..
 * @param <T> The instance type supported.
 * @param <H> The handler type.
 * @param <V> The view type.
 * @param <K> The callback type.
 */
public interface CanvasViewer<T, H extends CanvasHandler, V extends IsWidget, K extends Viewer.Callback> extends Viewer<T, H, V, K> {

    /**
     * Returns a canvas zoom control enabled and available to use.
     */
    <C extends Canvas> ZoomControl<C> getZoomControl();
}