com.haulmont.cuba.web.widgets.addons.dragdroplayouts.drophandlers.DefaultTabSheetDropHandler.java Source code

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Here is the source code for com.haulmont.cuba.web.widgets.addons.dragdroplayouts.drophandlers.DefaultTabSheetDropHandler.java

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/*
 * Copyright 2015 John Ahlroos
 * 
 * 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.haulmont.cuba.web.widgets.addons.dragdroplayouts.drophandlers;

import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.event.dd.acceptcriteria.AcceptCriterion;
import com.vaadin.event.dd.acceptcriteria.Not;
import com.vaadin.shared.ui.dd.HorizontalDropLocation;
import com.vaadin.ui.Component;
import com.vaadin.ui.ComponentContainer;
import com.vaadin.ui.SingleComponentContainer;
import com.vaadin.ui.TabSheet;
import com.vaadin.ui.TabSheet.Tab;

import com.haulmont.cuba.web.widgets.addons.dragdroplayouts.DDTabSheet;
import com.haulmont.cuba.web.widgets.addons.dragdroplayouts.DDTabSheet.TabSheetTargetDetails;
import com.haulmont.cuba.web.widgets.addons.dragdroplayouts.events.HorizontalLocationIs;
import com.haulmont.cuba.web.widgets.addons.dragdroplayouts.events.LayoutBoundTransferable;

/**
 * Default drop handler for tabsheets
 * 
 * @author John Ahlroos / www.jasoft.fi
 * @since 0.6.0
 */
@SuppressWarnings("serial")
public class DefaultTabSheetDropHandler extends AbstractDefaultLayoutDropHandler {

    @Override
    public AcceptCriterion getAcceptCriterion() {
        // Only allow drops between tabs
        return new Not(HorizontalLocationIs.CENTER);
    }

    @Override
    protected void handleComponentReordering(DragAndDropEvent event) {
        LayoutBoundTransferable transferable = (LayoutBoundTransferable) event.getTransferable();
        TabSheetTargetDetails details = (TabSheetTargetDetails) event.getTargetDetails();
        DDTabSheet tabSheet = (DDTabSheet) details.getTarget();
        Component c = transferable.getComponent();
        Tab tab = tabSheet.getTab(c);
        HorizontalDropLocation location = details.getDropLocation();
        int idx = details.getOverIndex();

        if (location == HorizontalDropLocation.LEFT) {
            // Left of previous tab
            int originalIndex = tabSheet.getTabPosition(tab);
            if (originalIndex > idx) {
                tabSheet.setTabPosition(tab, idx);
            } else if (idx - 1 >= 0) {
                tabSheet.setTabPosition(tab, idx - 1);
            }

        } else if (location == HorizontalDropLocation.RIGHT) {
            // Right of previous tab
            int originalIndex = tabSheet.getTabPosition(tab);
            if (originalIndex > idx) {
                tabSheet.setTabPosition(tab, idx + 1);
            } else {
                tabSheet.setTabPosition(tab, idx);
            }
        }
    }

    @Override
    protected void handleDropFromLayout(DragAndDropEvent event) {
        LayoutBoundTransferable transferable = (LayoutBoundTransferable) event.getTransferable();
        TabSheetTargetDetails details = (TabSheetTargetDetails) event.getTargetDetails();
        DDTabSheet tabSheet = (DDTabSheet) details.getTarget();
        Component c = transferable.getComponent();
        HorizontalDropLocation location = details.getDropLocation();
        int idx = details.getOverIndex();
        ComponentContainer source = (ComponentContainer) transferable.getSourceComponent();

        // Detach from old source
        if (source instanceof ComponentContainer) {
            ((ComponentContainer) source).removeComponent(c);
        } else if (source instanceof SingleComponentContainer) {
            ((SingleComponentContainer) source).setContent(null);
        }

        if (location == HorizontalDropLocation.LEFT) {
            tabSheet.addTab(c, idx);
        } else if (location == HorizontalDropLocation.RIGHT) {
            tabSheet.addTab(c, idx + 1);
        }
    }

    protected String resolveCaptionFromHTML5Drop(DragAndDropEvent event) {
        return event.getTransferable().getData("html5Data").toString();
    }

    @Override
    protected void handleHTML5Drop(DragAndDropEvent event) {
        TabSheetTargetDetails details = (TabSheetTargetDetails) event.getTargetDetails();
        HorizontalDropLocation location = details.getDropLocation();
        DDTabSheet tabSheet = (DDTabSheet) details.getTarget();
        int idx = details.getOverIndex();

        Component c = resolveComponentFromHTML5Drop(event);
        c.setCaption(resolveCaptionFromHTML5Drop(event));

        if (location == HorizontalDropLocation.LEFT) {
            tabSheet.addTab(c, idx);
        } else if (location == HorizontalDropLocation.RIGHT) {
            tabSheet.addTab(c, idx + 1);
        }
    }

    @Override
    public Class<TabSheet> getTargetLayoutType() {
        return TabSheet.class;
    }
}