ch.eaternity.client.FlexTableRowDragController.java Source code

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Here is the source code for ch.eaternity.client.FlexTableRowDragController.java

Source

package ch.eaternity.client;

/*
 * Copyright 2009 Fred Sauer
 * 
 * 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.
 */

import com.google.gwt.user.client.ui.AbsolutePanel;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.Widget;

import com.allen_sauer.gwt.dnd.client.DragContext;
import com.allen_sauer.gwt.dnd.client.PickupDragController;
import com.allen_sauer.gwt.dnd.client.drop.BoundaryDropController;

/**
 * Allows table rows to dragged by their handle.
 */
public final class FlexTableRowDragController extends PickupDragController {

    private static final String CSS_DEMO_FLEX_TABLE_ROW_EXAMPLE_TABLE_PROXY = "demo-FlexTableRowExample-table-proxy";

    private FlexTable draggableTable;

    private int dragRow;

    public FlexTableRowDragController(AbsolutePanel boundaryPanel) {
        super(boundaryPanel, false);
        setBehaviorDragProxy(true);
        setBehaviorMultipleSelection(false);
    }

    @Override
    public void dragEnd() {
        super.dragEnd();

        // cleanup
        draggableTable = null;
    }

    @Override
    public void setBehaviorDragProxy(boolean dragProxyEnabled) {
        if (!dragProxyEnabled) {
            // TODO implement drag proxy behavior
            throw new IllegalArgumentException();
        }
        super.setBehaviorDragProxy(dragProxyEnabled);
    }

    @Override
    protected BoundaryDropController newBoundaryDropController(AbsolutePanel boundaryPanel,
            boolean allowDroppingOnBoundaryPanel) {
        if (allowDroppingOnBoundaryPanel) {
            throw new IllegalArgumentException();
        }
        return super.newBoundaryDropController(boundaryPanel, allowDroppingOnBoundaryPanel);
    }

    @Override
    protected Widget newDragProxy(DragContext context) {
        FlexTable proxy;
        proxy = new FlexTable();
        proxy.addStyleName(CSS_DEMO_FLEX_TABLE_ROW_EXAMPLE_TABLE_PROXY);
        draggableTable = (FlexTable) context.draggable.getParent();
        dragRow = getWidgetRow(context.draggable, draggableTable);
        FlexTableUtil.copyRow(draggableTable, proxy, dragRow, 0);
        return proxy;
    }

    FlexTable getDraggableTable() {
        return draggableTable;
    }

    int getDragRow() {
        return dragRow;
    }

    private int getWidgetRow(Widget widget, FlexTable table) {
        for (int row = 0; row < table.getRowCount(); row++) {
            for (int col = 0; col < table.getCellCount(row); col++) {
                Widget w = table.getWidget(row, col);
                if (w == widget) {
                    return row;
                }
            }
        }
        throw new RuntimeException("Unable to determine widget row");
    }
}