Java tutorial
package org.activityinfo.ui.client.component.table.dialog; /* * #%L * ActivityInfo Server * %% * Copyright (C) 2009 - 2013 UNICEF * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public * License along with this program. If not, see * <http://www.gnu.org/licenses/gpl-3.0.html>. * #L% */ import com.google.common.base.Strings; import com.google.common.collect.Lists; import com.google.common.collect.Sets; import com.google.gwt.cell.client.TextCell; import com.google.gwt.core.client.GWT; import com.google.gwt.core.client.Scheduler; 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.event.dom.client.KeyUpEvent; import com.google.gwt.event.dom.client.KeyUpHandler; import com.google.gwt.uibinder.client.UiBinder; import com.google.gwt.uibinder.client.UiField; import com.google.gwt.uibinder.client.UiHandler; import com.google.gwt.user.cellview.client.Column; import com.google.gwt.user.cellview.client.DataGrid; import com.google.gwt.user.cellview.client.RowStyles; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.HTMLPanel; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.view.client.ListDataProvider; import com.google.gwt.view.client.MultiSelectionModel; import com.google.gwt.view.client.SelectionChangeEvent; import com.google.gwt.view.client.SimpleKeyProvider; import org.activityinfo.i18n.shared.I18N; import org.activityinfo.ui.client.component.table.FieldColumn; import org.activityinfo.ui.client.component.table.InstanceTableStyle; import org.activityinfo.ui.client.component.table.InstanceTableView; import org.activityinfo.ui.client.style.table.DataGridResources; import org.activityinfo.ui.client.widget.ModalDialog; import java.util.*; /** * @author yuriyz on 3/21/14. */ public class ChooseColumnsDialog { interface ChooseColumnsDialogUiBinder extends UiBinder<HTMLPanel, ChooseColumnsDialog> { } private static ChooseColumnsDialogUiBinder uiBinder = GWT.create(ChooseColumnsDialogUiBinder.class); private final ModalDialog dialog; private final InstanceTableView tableView; private final ListDataProvider<FieldColumn> selectedTableDataProvider = new ListDataProvider<>(); private final MultiSelectionModel<FieldColumn> selectedSelectionModel = new MultiSelectionModel<>( new SimpleKeyProvider<FieldColumn>()); private final DataGrid<FieldColumn> selectedTable; private final ListDataProvider<FieldColumn> tableDataProvider = new ListDataProvider<>(); private final MultiSelectionModel<FieldColumn> selectionModel = new MultiSelectionModel<>( new SimpleKeyProvider<FieldColumn>()); private final DataGrid<FieldColumn> table; @UiField HTMLPanel selectedColumnTableContainer; @UiField HTMLPanel columnTableContainer; @UiField Button rightButton; @UiField Button leftButton; @UiField TextBox filterColumnTable; @UiField Button upButton; @UiField Button downButton; public ChooseColumnsDialog(final InstanceTableView tableView) { this.tableView = tableView; DataGridResources.INSTANCE.dataGridStyle().ensureInjected(); dialog = new ModalDialog(uiBinder.createAndBindUi(this)); dialog.setDialogTitle(I18N.CONSTANTS.chooseColumns()); dialog.getPrimaryButton().addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { onOk(); } }); selectedTable = createTable(); selectedTable.setSelectionModel(selectedSelectionModel); selectedTableDataProvider.addDataDisplay(selectedTable); selectedTableDataProvider.setList(tableView.getSelectedColumns()); selectedTableDataProvider.refresh(); final List<FieldColumn> allColumns = Lists.newArrayList(tableView.getColumns()); table = createTable(); table.setSelectionModel(selectionModel); table.setRowStyles(new RowStyles<FieldColumn>() { @Override public String getStyleNames(FieldColumn row, int rowIndex) { if (selectedTableDataProvider.getList().contains(row)) { return InstanceTableStyle.INSTANCE.rowPresent(); } return null; } }); tableDataProvider.addDataDisplay(table); tableDataProvider.setList(allColumns); tableDataProvider.refresh(); selectedColumnTableContainer.add(selectedTable); columnTableContainer.add(table); setMoveRightButtonState(); setRemoveButtonState(); setUpButtonState(); setDownButtonState(); selectedSelectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() { @Override public void onSelectionChange(SelectionChangeEvent event) { setRemoveButtonState(); setMoveRightButtonState(); setDownButtonState(); setUpButtonState(); } }); selectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() { @Override public void onSelectionChange(SelectionChangeEvent event) { setMoveRightButtonState(); setRemoveButtonState(); } }); filterColumnTable.addKeyUpHandler(new KeyUpHandler() { @Override public void onKeyUp(KeyUpEvent event) { final String value = filterColumnTable.getValue(); final ArrayList<FieldColumn> columnsToShow = Lists.newArrayList(); for (FieldColumn column : tableView.getColumns()) { final String headerLowercased = column.getHeader().toLowerCase(); if (Strings.isNullOrEmpty(value) || headerLowercased.contains(value.toLowerCase())) { columnsToShow.add(column); } } tableDataProvider.setList(columnsToShow); tableDataProvider.refresh(); } }); } public void show() { dialog.show(); } private static DataGrid<FieldColumn> createTable() { final Column<FieldColumn, String> labelColumn = new Column<FieldColumn, String>(new TextCell()) { @Override public String getValue(FieldColumn object) { return object.getHeader(); } }; labelColumn.setSortable(false); final DataGrid<FieldColumn> table = new DataGrid<>(1000, DataGridResources.INSTANCE); table.setHeight("300px"); // need to avoid height hardcode table.setEmptyTableWidget(new Label()); table.setAutoHeaderRefreshDisabled(true); table.setAutoFooterRefreshDisabled(true); table.setSkipRowHoverCheck(true); table.setSkipRowHoverFloatElementCheck(true); table.addColumn(labelColumn); table.setColumnWidth(labelColumn, 100, Style.Unit.PCT); return table; } private void onOk() { tableView.setSelectedColumns(Lists.newArrayList(selectedTableDataProvider.getList())); dialog.hide(); } public void setMoveRightButtonState() { final HashSet<FieldColumn> selectedSet = Sets.newHashSet(selectionModel.getSelectedSet()); selectedSet.removeAll(selectedTableDataProvider.getList()); rightButton.setEnabled(!selectedSet.isEmpty()); } public void setRemoveButtonState() { leftButton.setEnabled(!selectedSelectionModel.getSelectedSet().isEmpty()); } public void setUpButtonState() { boolean enabled = false; if (!selectedSelectionModel.getSelectedSet().isEmpty()) { int minIndex = -1; for (FieldColumn column : selectedSelectionModel.getSelectedSet()) { final int indexOf = selectedTableDataProvider.getList().indexOf(column); if (minIndex > indexOf || minIndex == -1) { minIndex = indexOf; } } if (minIndex > 0) { enabled = true; } } upButton.setEnabled(enabled); } public void setDownButtonState() { boolean enabled = false; if (!selectedSelectionModel.getSelectedSet().isEmpty()) { int maxIndex = -1; for (FieldColumn column : selectedSelectionModel.getSelectedSet()) { final int indexOf = selectedTableDataProvider.getList().indexOf(column); if (maxIndex < indexOf || maxIndex == -1) { maxIndex = indexOf; } } if (maxIndex < (selectedTableDataProvider.getList().size() - 1)) { enabled = true; } } downButton.setEnabled(enabled); } @UiHandler("rightButton") public void onMoveRight(ClickEvent event) { final Set<FieldColumn> set = Sets.newHashSet(selectionModel.getSelectedSet()); set.removeAll(selectedTableDataProvider.getList()); selectedTableDataProvider.getList().addAll(set); selectedTableDataProvider.refresh(); Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() { @Override public void execute() { setMoveRightButtonState(); redrawTableRows(set); } }); } public void redrawTableRows(Collection<FieldColumn> rows) { for (FieldColumn column : rows) { final int index = tableDataProvider.getList().indexOf(column); if (index != -1) { table.redrawRow(index); } } } @UiHandler("leftButton") public void onMoveLeft(ClickEvent event) { final Set<FieldColumn> set = selectedSelectionModel.getSelectedSet(); selectedTableDataProvider.getList().removeAll(set); selectedTableDataProvider.refresh(); selectedSelectionModel.clear(); // remove selection explicitly Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() { @Override public void execute() { setUpButtonState(); setDownButtonState(); setRemoveButtonState(); redrawTableRows(set); } }); } @UiHandler("upButton") public void onUp(ClickEvent event) { final Set<FieldColumn> set = selectedSelectionModel.getSelectedSet(); final ArrayList<FieldColumn> copy = Lists.newArrayList(selectedTableDataProvider.getList()); for (FieldColumn column : set) { final int index = copy.indexOf(column); if (index > 0) { Collections.swap(copy, index, index - 1); } } selectedTableDataProvider.setList(copy); setUpButtonState(); } @UiHandler("downButton") public void onDown(ClickEvent event) { final Set<FieldColumn> set = selectedSelectionModel.getSelectedSet(); final ArrayList<FieldColumn> copy = Lists.newArrayList(selectedTableDataProvider.getList()); final int size = copy.size(); for (FieldColumn column : set) { final int index = copy.indexOf(column); if (index < (size - 1)) { Collections.swap(copy, index, index + 1); } } selectedTableDataProvider.setList(copy); setDownButtonState(); } }