Java tutorial
/* * UnsavedChangesDialog.java * * Copyright (C) 2009-12 by RStudio, Inc. * * Unless you have received this program directly from RStudio pursuant * to the terms of a commercial license agreement with RStudio, then * this program is licensed to you under the terms of version 3 of the * GNU Affero General Public License. This program is distributed WITHOUT * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT, * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details. * */ package org.rstudio.studio.client.workbench.ui.unsaved; import java.util.ArrayList; import org.rstudio.core.client.SafeHtmlUtil; import org.rstudio.core.client.StringUtil; import org.rstudio.core.client.widget.ModalDialog; import org.rstudio.core.client.widget.Operation; import org.rstudio.core.client.widget.OperationWithInput; import org.rstudio.core.client.widget.ThemedButton; import org.rstudio.studio.client.workbench.model.UnsavedChangesTarget; import com.google.gwt.cell.client.AbstractCell; import com.google.gwt.cell.client.CheckboxCell; import com.google.gwt.cell.client.ImageResourceCell; import com.google.gwt.core.client.GWT; import com.google.gwt.dom.client.Style.Unit; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.resources.client.ClientBundle; import com.google.gwt.resources.client.CssResource; import com.google.gwt.resources.client.ImageResource; import com.google.gwt.safehtml.shared.SafeHtmlBuilder; import com.google.gwt.user.cellview.client.CellTable; import com.google.gwt.user.cellview.client.Column; import com.google.gwt.user.cellview.client.IdentityColumn; import com.google.gwt.user.client.Command; import com.google.gwt.user.client.ui.CheckBox; import com.google.gwt.user.client.ui.HasVerticalAlignment; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.ScrollPanel; import com.google.gwt.user.client.ui.VerticalPanel; import com.google.gwt.user.client.ui.Widget; import com.google.gwt.view.client.DefaultSelectionEventManager; import com.google.gwt.view.client.ListDataProvider; import com.google.gwt.view.client.MultiSelectionModel; import com.google.gwt.view.client.ProvidesKey; public class UnsavedChangesDialog extends ModalDialog<UnsavedChangesDialog.Result> { public class Result { public Result(ArrayList<UnsavedChangesTarget> saveTargets, boolean alwaysSave) { saveTargets_ = saveTargets; alwaysSave_ = alwaysSave; } public ArrayList<UnsavedChangesTarget> getSaveTargets() { return saveTargets_; } public boolean getAlwaysSave() { return alwaysSave_; } private ArrayList<UnsavedChangesTarget> saveTargets_; private boolean alwaysSave_; } public UnsavedChangesDialog(String title, ArrayList<UnsavedChangesTarget> dirtyTargets, final OperationWithInput<Result> saveOperation, final Command onCancelled) { this(title, null, dirtyTargets, saveOperation, onCancelled); } public UnsavedChangesDialog(String title, String alwaysSaveOption, ArrayList<UnsavedChangesTarget> dirtyTargets, final OperationWithInput<Result> saveOperation, final Command onCancelled) { super(title, saveOperation, onCancelled != null ? new Operation() { @Override public void execute() { onCancelled.execute(); } } : null); alwaysSaveOption_ = StringUtil.notNull(alwaysSaveOption); targets_ = dirtyTargets; setOkButtonCaption("Save Selected"); addLeftButton(new ThemedButton("Don't Save", new ClickHandler() { @Override public void onClick(ClickEvent event) { closeDialog(); saveOperation.execute(new Result(new ArrayList<UnsavedChangesTarget>(), false)); } })); } @Override protected Widget createMainWidget() { // create cell table targetsCellTable_ = new CellTable<UnsavedChangesTarget>(15, UnsavedChangesCellTableResources.INSTANCE, KEY_PROVIDER); selectionModel_ = new MultiSelectionModel<UnsavedChangesTarget>(KEY_PROVIDER); targetsCellTable_.setSelectionModel(selectionModel_, DefaultSelectionEventManager.<UnsavedChangesTarget>createCheckboxManager()); targetsCellTable_.setWidth("100%", true); // add columns addSelectionColumn(); addIconColumn(); addNameAndPathColumn(); // hook-up data provider dataProvider_ = new ListDataProvider<UnsavedChangesTarget>(); dataProvider_.setList(targets_); dataProvider_.addDataDisplay(targetsCellTable_); targetsCellTable_.setPageSize(targets_.size()); // select all by default for (UnsavedChangesTarget editingTarget : dataProvider_.getList()) selectionModel_.setSelected(editingTarget, true); // enclose cell table in scroll panel ScrollPanel scrollPanel = new ScrollPanel(); scrollPanel.setStylePrimaryName(RESOURCES.styles().targetScrollPanel()); scrollPanel.setWidget(targetsCellTable_); if (dataProvider_.getList().size() > 4) scrollPanel.setHeight("280px"); // always save check box (may not be shown) chkAlwaysSave_ = new CheckBox(alwaysSaveOption_); // main widget VerticalPanel panel = new VerticalPanel(); Label captionLabel = new Label("The following files have unsaved changes:"); captionLabel.setStylePrimaryName(RESOURCES.styles().captionLabel()); panel.add(captionLabel); panel.add(scrollPanel); if (!StringUtil.isNullOrEmpty(alwaysSaveOption_)) { panel.add(chkAlwaysSave_); panel.setCellHeight(chkAlwaysSave_, "30px"); panel.setCellVerticalAlignment(chkAlwaysSave_, HasVerticalAlignment.ALIGN_MIDDLE); } return panel; } private Column<UnsavedChangesTarget, Boolean> addSelectionColumn() { Column<UnsavedChangesTarget, Boolean> checkColumn = new Column<UnsavedChangesTarget, Boolean>( new CheckboxCell(true, false)) { @Override public Boolean getValue(UnsavedChangesTarget object) { return selectionModel_.isSelected(object); } }; checkColumn.setVerticalAlignment(HasVerticalAlignment.ALIGN_TOP); targetsCellTable_.addColumn(checkColumn); targetsCellTable_.setColumnWidth(checkColumn, 25, Unit.PX); return checkColumn; } private Column<UnsavedChangesTarget, ImageResource> addIconColumn() { Column<UnsavedChangesTarget, ImageResource> iconColumn = new Column<UnsavedChangesTarget, ImageResource>( new ImageResourceCell()) { @Override public ImageResource getValue(UnsavedChangesTarget object) { return object.getIcon(); } }; targetsCellTable_.addColumn(iconColumn); targetsCellTable_.setColumnWidth(iconColumn, 20, Unit.PX); return iconColumn; } private class NameAndPathCell extends AbstractCell<UnsavedChangesTarget> { @Override public void render(com.google.gwt.cell.client.Cell.Context context, UnsavedChangesTarget value, SafeHtmlBuilder sb) { if (value != null) { Styles styles = RESOURCES.styles(); String path = value.getPath(); if (path != null) { SafeHtmlUtil.appendDiv(sb, styles.targetName(), value.getTitle()); SafeHtmlUtil.appendDiv(sb, styles.targetPath(), path); } else { SafeHtmlUtil.appendDiv(sb, styles.targetUntitled(), value.getTitle()); } } } } private IdentityColumn<UnsavedChangesTarget> addNameAndPathColumn() { IdentityColumn<UnsavedChangesTarget> nameAndPathColumn = new IdentityColumn<UnsavedChangesTarget>( new NameAndPathCell()); targetsCellTable_.addColumn(nameAndPathColumn); targetsCellTable_.setColumnWidth(nameAndPathColumn, 350, Unit.PX); return nameAndPathColumn; } @Override protected Result collectInput() { return new Result(new ArrayList<UnsavedChangesTarget>(selectionModel_.getSelectedSet()), chkAlwaysSave_.getValue()); } @Override protected boolean validate(Result input) { return true; } static interface Styles extends CssResource { String targetScrollPanel(); String captionLabel(); String targetName(); String targetPath(); String targetUntitled(); } static interface Resources extends ClientBundle { @Source("UnsavedChangesDialog.css") Styles styles(); } static Resources RESOURCES = (Resources) GWT.create(Resources.class); public static void ensureStylesInjected() { RESOURCES.styles().ensureInjected(); } private static final ProvidesKey<UnsavedChangesTarget> KEY_PROVIDER = new ProvidesKey<UnsavedChangesTarget>() { @Override public Object getKey(UnsavedChangesTarget item) { return item.getId(); } }; private final ArrayList<UnsavedChangesTarget> targets_; private CellTable<UnsavedChangesTarget> targetsCellTable_; private ListDataProvider<UnsavedChangesTarget> dataProvider_; private MultiSelectionModel<UnsavedChangesTarget> selectionModel_; private final String alwaysSaveOption_; private CheckBox chkAlwaysSave_; }