Java tutorial
/* * Copyright 2014 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.dashbuilder.renderer.chartjs; import java.util.ArrayList; import java.util.List; import com.google.gwt.core.client.JavaScriptObject; import com.google.gwt.core.client.JsArray; import com.google.gwt.dom.client.Style; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Anchor; import com.google.gwt.user.client.ui.FlowPanel; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Panel; import com.google.gwt.user.client.ui.Widget; import org.dashbuilder.displayer.client.AbstractGwtDisplayerView; import org.dashbuilder.renderer.chartjs.lib.Chart; import org.dashbuilder.renderer.chartjs.lib.data.AreaChartData; import org.dashbuilder.renderer.chartjs.lib.data.AreaChartDataProvider; import org.dashbuilder.renderer.chartjs.lib.data.AreaSeries; import org.dashbuilder.renderer.chartjs.lib.data.SeriesBuilder; import org.dashbuilder.renderer.chartjs.lib.event.DataSelectionEvent; import org.dashbuilder.renderer.chartjs.lib.event.DataSelectionHandler; import org.dashbuilder.renderer.chartjs.resources.i18n.ChartJsDisplayerConstants; import org.gwtbootstrap3.client.ui.Label; public abstract class ChartJsDisplayerView<P extends ChartJsDisplayer> extends AbstractGwtDisplayerView<P> implements ChartJsDisplayer.View<P> { private Panel container = new FlowPanel(); private Panel filterPanel = new HorizontalPanel(); private Panel displayerPanel = new FlowPanel(); private HTML titleHtml = new HTML(); private Chart chart = null; private List<String> labels = new ArrayList<String>(); private JsArray<AreaSeries> series; protected boolean filterEnabled = false; protected String title = null; protected int width = 500; protected int height = 300; protected int marginTop = 10; protected int marginBottom = 10; protected int marginRight = 10; protected int marginLeft = 10; public void showDisplayer(Widget w) { displayerPanel.clear(); displayerPanel.add(w); } @Override public void init(P presenter) { super.setPresenter(presenter); super.setVisualization(container); container.add(titleHtml); container.add(filterPanel); container.add(displayerPanel); filterPanel.getElement().setAttribute("cellpadding", "2"); } @Override public void clear() { super.clear(); ChartJsRenderer.closeDisplayer(getPresenter()); } @Override public void setWidth(int width) { this.width = width; } @Override public void setHeight(int height) { this.height = height; } @Override public void setMarginTop(int marginTop) { this.marginTop = marginTop; } @Override public void setMarginBottom(int marginBottom) { this.marginBottom = marginBottom; } @Override public void setMarginRight(int marginRight) { this.marginRight = marginRight; } @Override public void setMarginLeft(int marginLeft) { this.marginLeft = marginLeft; } @Override public void dataClear() { labels.clear(); series = JavaScriptObject.createArray().cast(); } @Override public void dataAddLabel(String label) { labels.add(label); } @Override public void dataAddSerie(String columnName, String color, double[] values) { series.push(SeriesBuilder.create().withLabel(columnName).withFillColor(color).withStoreColor(color) .withPointColor(color).withPointStrokeColor("#FFFF").withData(values).get()); } @Override public String getGroupsTitle() { return ChartJsDisplayerConstants.INSTANCE.common_Categories(); } @Override public String getColumnsTitle() { return ChartJsDisplayerConstants.INSTANCE.common_Series(); } @Override public void setTitle(String title) { titleHtml.setText(title); } @Override public void setFilterEnabled(boolean enabled) { this.filterEnabled = enabled; } @Override public void clearFilterStatus() { if (filterPanel != null) { filterPanel.clear(); } } @Override public void addFilterValue(String value) { filterPanel.add(new Label(value)); } @Override public void addFilterReset() { Anchor anchor = new Anchor(ChartJsDisplayerConstants.INSTANCE.chartjsDisplayer_resetAnchor()); filterPanel.add(anchor); anchor.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { getPresenter().onFilterResetClicked(); } }); } @Override public void nodata() { showDisplayer(new Label(ChartJsDisplayerConstants.INSTANCE.common_noData())); } @Override public void drawChart() { if (chart == null) { chart = createChart(); showDisplayer(chart); } if (filterEnabled) { chart.addDataSelectionHandler(new DataSelectionHandler() { public void onDataSelected(DataSelectionEvent event) { // TODO Object o = event.getSource(); } }); } adjustChartSize(chart); chart.update(); } // Common methods used in subclasses protected Chart createChart() { return null; } protected void adjustChartSize(Chart chart) { int chartWidth = width - marginLeft; int chartHeight = height - marginTop; chart.getElement().getStyle().setPaddingTop(marginTop, Style.Unit.PX); chart.getElement().getStyle().setPaddingLeft(marginLeft, Style.Unit.PX); chart.setPixelWidth(chartWidth); chart.setPixelHeight(chartHeight); } protected AreaChartDataProvider createAreaDataProvider() { return new AreaChartDataProvider() { public JavaScriptObject getData() { return createChartData(); } public void reload(AsyncCallback<AreaChartData> callback) { AreaChartData data = createChartData(); callback.onSuccess(data); } }; } protected AreaChartData createChartData() { String[] labelsArray = new String[labels.size()]; labels.toArray(labelsArray); AreaChartData data = JavaScriptObject.createObject().cast(); data.setLabels(labelsArray); data.setSeries(series); return data; } }