com.java33.vizpres.client.view.visualization.CellViz.java Source code

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Here is the source code for com.java33.vizpres.client.view.visualization.CellViz.java

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/*
 * Copyright (c) 2011 Jon Buffington. All rights reserved.
 *
 * 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.java33.vizpres.client.view.visualization;

import com.google.gwt.core.client.GWT;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiConstructor;
import com.google.gwt.uibinder.client.UiFactory;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.cellview.client.CellList;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.view.client.SelectionChangeEvent;
import com.google.gwt.view.client.SingleSelectionModel;
import com.java33.vizpres.client.view.cell.BarCell;
import com.java33.vizpres.shared.model.PercentValue;

import java.util.List;

/**
 * Is a simple demonstration using a CellList to render a bar chart. The
 * CellList uses {@link BarCell} to render the bar.
 *
 * @author Jon Buffington
 */
public class CellViz extends Composite implements IsDataSync {
    interface CellVizUiBinder extends UiBinder<FlowPanel, CellViz> {
    }

    private final static CellVizUiBinder UIBINDER = GWT.create(CellVizUiBinder.class);

    private final String width;
    private final String height;

    @UiField
    CellList<PercentValue> cellList;
    @UiField
    Label infoLabel;

    @UiConstructor
    public CellViz(final String width, final String height) {
        this.width = width;
        this.height = height;
        initWidget(UIBINDER.createAndBindUi(this));
    }

    /**
     * Create a {@link CellList} instance using a custom factory method. The custom
     * factory is required because a CellList must be constructed using an
     * instance of its cell type.
     *
     * @return Returns a CellList that uses {@link BarCell} for rendering values.
     */
    @UiFactory
    CellList<PercentValue> makeCellList() {
        // Create a CellList using the custom BarCell class for rendering and interaction handling.
        final CellList<PercentValue> cellList = new CellList<PercentValue>(new BarCell());
        cellList.setWidth(width);
        cellList.setHeight(height);

        final SingleSelectionModel<PercentValue> selectionModel = new SingleSelectionModel<PercentValue>();
        cellList.setSelectionModel(selectionModel);
        selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {
            public void onSelectionChange(SelectionChangeEvent event) {
                final PercentValue selectedObject = selectionModel.getSelectedObject();
                if (selectedObject != null) {
                    infoLabel.setText("You selected: " + Integer.toString(selectedObject.percentage));
                }
            }
        });

        return cellList;
    }

    @Override
    public void setData(final List<PercentValue> values) {
        final StringBuilder sb = new StringBuilder("Drawing ").append(values.size()).append(" values.");
        infoLabel.setText(sb.toString());
        cellList.setRowData(values);
    }
}