org.uberfire.ext.layout.editor.client.dnd.DropRowPanel.java Source code

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Here is the source code for org.uberfire.ext.layout.editor.client.dnd.DropRowPanel.java

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/*
 * Copyright 2015 JBoss, by Red Hat, Inc
 *
 * 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.ext.layout.editor.client.dnd;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.DragLeaveEvent;
import com.google.gwt.event.dom.client.DragLeaveHandler;
import com.google.gwt.event.dom.client.DragOverEvent;
import com.google.gwt.event.dom.client.DragOverHandler;
import com.google.gwt.event.dom.client.DropEvent;
import com.google.gwt.event.dom.client.DropHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.FlowPanel;
import org.gwtbootstrap3.client.ui.Label;
import org.uberfire.ext.layout.editor.client.components.GridLayoutDragComponent;
import org.uberfire.ext.layout.editor.client.components.LayoutDragComponent;
import org.uberfire.ext.layout.editor.client.resources.WebAppResource;
import org.uberfire.ext.layout.editor.client.resources.i18n.CommonConstants;
import org.uberfire.ext.layout.editor.client.row.RowView;
import org.uberfire.ext.layout.editor.client.structure.LayoutEditorWidget;

public class DropRowPanel extends FlowPanel {

    private DndDataJSONConverter converter = new DndDataJSONConverter();

    private final LayoutEditorWidget parent;

    public DropRowPanel(final LayoutEditorWidget parent) {
        this.parent = parent;

        Label label = GWT.create(Label.class);
        label.setText(CommonConstants.INSTANCE.NewRow());
        this.add(label);

        addCSSClass(WebAppResource.INSTANCE.CSS().dropInactive());
        addDragOverHandler(new DragOverHandler() {
            @Override
            public void onDragOver(DragOverEvent event) {
                dragOverHandler();
            }
        });
        addDragLeaveHandler(new DragLeaveHandler() {
            @Override
            public void onDragLeave(DragLeaveEvent event) {
                dragLeaveHandler();
            }
        });
        addDropHandler(new DropHandler() {
            @Override
            public void onDrop(DropEvent event) {
                dropHandler(event);
            }
        });
    }

    void dropHandler(DropEvent event) {
        event.preventDefault();

        LayoutDragComponent component = converter.readJSONDragComponent(event.getData(LayoutDragComponent.FORMAT));

        if (component instanceof GridLayoutDragComponent) {
            handleGridDrop(((GridLayoutDragComponent) component).getSpan());
        }
        dragLeaveHandler();
    }

    void dragOverHandler() {
        removeCSSClass(WebAppResource.INSTANCE.CSS().dropInactive());
        addCSSClass(WebAppResource.INSTANCE.CSS().dropBorder());
    }

    void addCSSClass(String className) {
        getElement().addClassName(className);
    }

    void dragLeaveHandler() {
        removeCSSClass(WebAppResource.INSTANCE.CSS().dropBorder());
        addCSSClass(WebAppResource.INSTANCE.CSS().dropInactive());
    }

    void removeCSSClass(String className) {
        getElement().removeClassName(className);
    }

    private void handleGridDrop(String grid) {
        if (isAGridDrop(grid)) {
            parent.getWidget().remove(this);
            parent.getWidget().add(createRowView(grid));
            parent.getWidget().add(createDropRowPanel());
        }
    }

    private DropRowPanel createDropRowPanel() {
        return new DropRowPanel(parent);
    }

    private RowView createRowView(String grid) {
        return new RowView(parent, grid);
    }

    private boolean isAGridDrop(String grid) {
        return grid != null && !grid.isEmpty();
    }

    private HandlerRegistration addDropHandler(DropHandler handler) {
        return addBitlessDomHandler(handler, DropEvent.getType());
    }

    private HandlerRegistration addDragOverHandler(DragOverHandler handler) {
        return addBitlessDomHandler(handler, DragOverEvent.getType());
    }

    private HandlerRegistration addDragLeaveHandler(DragLeaveHandler handler) {
        return addBitlessDomHandler(handler, DragLeaveEvent.getType());
    }

    public void setConverter(DndDataJSONConverter converter) {
        this.converter = converter;
    }
}