Java tutorial
/* * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. * Copyright (c) 2013, MPL CodeInside http://codeinside.ru */ package org.vaadin.dialogs; import java.lang.reflect.Method; import java.text.NumberFormat; import java.util.Locale; import org.vaadin.dialogs.ConfirmDialog.Factory; import com.vaadin.event.ShortcutAction.KeyCode; import com.vaadin.ui.Alignment; import com.vaadin.ui.Button; import com.vaadin.ui.Button.ClickEvent; import com.vaadin.ui.Component; import com.vaadin.ui.HorizontalLayout; import com.vaadin.ui.Label; import com.vaadin.ui.Panel; import com.vaadin.ui.VerticalLayout; import com.vaadin.ui.Window; import com.vaadin.ui.Window.CloseEvent; import com.vaadin.ui.themes.Reindeer; public class DefaultConfirmDialogFactory implements Factory { /** Generated serial UID. */ private static final long serialVersionUID = -5412321247707480466L; // System wide defaults protected static final String DEFAULT_CAPTION = "Confirm"; protected static final String DEFAULT_MESSAGE = "Are You sure?"; protected static final String DEFAULT_OK_CAPTION = "Ok"; protected static final String DEFAULT_CANCEL_CAPTION = "Cancel"; // System wide defaults private static final double MIN_WIDTH = 20d; private static final double MAX_WIDTH = 40d; private static final double MIN_HEIGHT = 1d; private static final double MAX_HEIGHT = 30d; private static final double BUTTON_HEIGHT = 2.5; public ConfirmDialog create(final String caption, final String message, final String okCaption, final String cancelCaption) { // Create a confirm dialog final ConfirmDialog confirm = new ConfirmDialog(); confirm.setCaption(caption != null ? caption : DEFAULT_CAPTION); // Close listener implementation confirm.addListener(new Window.CloseListener() { private static final long serialVersionUID = 1971800928047045825L; public void windowClose(CloseEvent ce) { // Only process if still enabled if (confirm.isEnabled()) { confirm.setEnabled(false); // avoid double processing confirm.setConfirmed(false); if (confirm.getListener() != null) { confirm.getListener().onClose(confirm); } } } }); // Create content VerticalLayout c = (VerticalLayout) confirm.getContent(); c.setSizeFull(); c.setSpacing(true); // Panel for scrolling lengthty messages. Panel scroll = new Panel(new VerticalLayout()); scroll.setScrollable(true); c.addComponent(scroll); scroll.setWidth("100%"); scroll.setHeight("100%"); scroll.setStyleName(Reindeer.PANEL_LIGHT); c.setExpandRatio(scroll, 1f); // Always HTML, but escape Label text = new Label("", Label.CONTENT_RAW); scroll.addComponent(text); confirm.setMessageLabel(text); confirm.setMessage(message); HorizontalLayout buttons = new HorizontalLayout(); c.addComponent(buttons); buttons.setSpacing(true); buttons.setHeight(format(BUTTON_HEIGHT) + "em"); buttons.setWidth("100%"); Label spacerLeft = new Label(""); buttons.addComponent(spacerLeft); spacerLeft.setWidth("100%"); buttons.setExpandRatio(spacerLeft, 1f); final Button cancel = new Button(cancelCaption != null ? cancelCaption : DEFAULT_CANCEL_CAPTION); cancel.setData(false); cancel.setClickShortcut(KeyCode.ESCAPE, null); buttons.addComponent(cancel); confirm.setCancelButton(cancel); final Button ok = new Button(okCaption != null ? okCaption : DEFAULT_OK_CAPTION); ok.setData(true); ok.setClickShortcut(KeyCode.ENTER, null); ok.focus(); buttons.addComponent(ok); confirm.setOkButton(ok); Label spacerRight = new Label(""); buttons.addComponent(spacerRight); spacerRight.setWidth("100%"); buttons.setExpandRatio(spacerRight, 1f); // Create a listener for buttons Button.ClickListener cb = new Button.ClickListener() { private static final long serialVersionUID = 3525060915814334881L; public void buttonClick(ClickEvent event) { // Copy the button date to window for passing through either // "OK" or "CANCEL". Only process id still enabled. if (confirm.isEnabled()) { confirm.setEnabled(false); // Avoid double processing confirm.setConfirmed(event.getButton() == ok); // We need to cast this way, because of the backward // compatibility issue in 6.4 series. Component parent = confirm.getParent(); if (parent instanceof Window) { try { Method m = Window.class.getDeclaredMethod("removeWindow", Window.class); m.invoke(parent, confirm); } catch (Exception e) { throw new RuntimeException( "Failed to remove confirmation dialog from the parent window.", e); } } // This has to be invoked as the window.close // event is not fired when removed. if (confirm.getListener() != null) { confirm.getListener().onClose(confirm); } } } }; cancel.addListener(cb); ok.addListener(cb); // Approximate the size of the dialog double[] dim = getDialogDimensions(message, ConfirmDialog.CONTENT_TEXT_WITH_NEWLINES); confirm.setWidth(format(dim[0]) + "em"); confirm.setHeight(format(dim[1]) + "em"); confirm.setResizable(false); return confirm; } /** * Approximates the dialog dimensions based on its message length. * * @param message * Message string * @return */ protected double[] getDialogDimensions(String message, int style) { // Based on Reindeer style: double chrW = 0.5d; double chrH = 1.5d; double length = chrW * message.length(); double rows = Math.ceil(length / MAX_WIDTH); // Estimate extra lines if (style == ConfirmDialog.CONTENT_TEXT_WITH_NEWLINES) { rows += count("\n", message); } // System.out.println(message.length() + " = " + length + "em"); // System.out.println("Rows: " + (length / MAX_WIDTH) + " = " + rows); // Obey maximum size double width = Math.min(MAX_WIDTH, length); double height = Math.ceil(Math.min(MAX_HEIGHT, rows * chrH)); // Obey the minimum size width = Math.max(width, MIN_WIDTH); height = Math.max(height, MIN_HEIGHT); // Based on Reindeer style: double btnHeight = 2.5d; double vmargin = 8d; double hmargin = 2d; double[] res = new double[] { width + hmargin, height + btnHeight + vmargin }; // System.out.println(res[0] + "," + res[1]); return res; } /** * Count the number of needles within a haystack. * * @param needle * The string to search for. * @param haystack * The string to process. * @return */ private static int count(final String needle, final String haystack) { int count = 0; int pos = -1; while ((pos = haystack.indexOf(needle, pos + 1)) >= 0) { count++; } return count; } /** * Format a double single fraction digit. * * @param n * @return */ private String format(double n) { NumberFormat nf = NumberFormat.getNumberInstance(Locale.ENGLISH); nf.setMaximumFractionDigits(1); nf.setGroupingUsed(false); return nf.format(n); } }