Java tutorial
/******************************************************************************* * Copyright (c) 2014, 2015 Scott Clarke (scott@dawg6.com). * * This file is part of Dawg6's Demon Hunter DPS Calculator. * * Dawg6's Demon Hunter DPS Calculator 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. * * Dawg6's Demon Hunter DPS Calculator 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/>. *******************************************************************************/ package com.dawg6.web.dhcalc.client; import java.beans.Beans; import com.dawg6.gwt.client.ApplicationPanel; import com.dawg6.gwt.common.util.AsyncTaskHandler; import com.dawg6.gwt.common.util.DefaultCallback; import com.dawg6.web.dhcalc.shared.calculator.FormData; import com.google.gwt.event.dom.client.ChangeEvent; import com.google.gwt.event.dom.client.ChangeHandler; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.json.client.JSONObject; import com.google.gwt.storage.client.Storage; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.CaptionPanel; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.FileUpload; import com.google.gwt.user.client.ui.FlexTable; import com.google.gwt.user.client.ui.FormPanel; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.Hidden; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.ListBox; import com.google.gwt.user.client.ui.TabPanel; import com.google.gwt.user.client.ui.TextArea; import com.google.gwt.user.client.ui.TextBox; public class SavePanel extends Composite { private final FileUpload fileUpload; private final Hidden clientKey; private final TextArea textArea; private final TextBox nameField; private final FlexTable browserPanel; private final FlexTable filePanel; private final FlexTable textPanel; private final TabPanel tabPanel; private FormListener listener; private final FormPanel loadPanel; private final ListBox storageList; public SavePanel() { CaptionPanel captionPanel = new CaptionPanel("Save/Load"); initWidget(captionPanel); FlexTable flexTable_3 = new FlexTable(); flexTable_3.setCellPadding(2); captionPanel.setContentWidget(flexTable_3); tabPanel = new TabPanel(); flexTable_3.setWidget(0, 0, tabPanel); browserPanel = new FlexTable(); browserPanel.setCellPadding(2); if (Storage.isLocalStorageSupported()) { tabPanel.add(browserPanel, "Browser Storage", false); } storageList = new ListBox(); browserPanel.setWidget(0, 0, storageList); storageList.setWidth("100%"); storageList.setVisibleItemCount(5); nameField = new TextBox(); nameField.setVisibleLength(30); nameField.setText("Enter a Name"); browserPanel.setWidget(1, 0, nameField); Button btnNewButton = new Button("New button"); browserPanel.setWidget(1, 1, btnNewButton); btnNewButton.setText("Add"); btnNewButton.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { addLocalStorage(); } }); HorizontalPanel horizontalPanel = new HorizontalPanel(); horizontalPanel.setSpacing(5); horizontalPanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER); browserPanel.setWidget(2, 0, horizontalPanel); Button button_6 = new Button("New button"); button_6.setText("Save"); horizontalPanel.add(button_6); button_6.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { saveLocalStorage(); } }); Button button_5 = new Button("New button"); horizontalPanel.add(button_5); button_5.setText("Restore"); button_5.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { restoreLocalStorage(); } }); Button button_2 = new Button("New button"); horizontalPanel.add(button_2); button_2.setText("Delete"); button_2.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { deleteLocalStorage(); } }); Button btnNewButton_1 = new Button("New button"); horizontalPanel.add(btnNewButton_1); btnNewButton_1.setText("Rename"); btnNewButton_1.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { renameLocalStorage(); } }); browserPanel.getFlexCellFormatter().setColSpan(0, 0, 1); browserPanel.getFlexCellFormatter().setColSpan(2, 0, 1); browserPanel.getFlexCellFormatter().setColSpan(0, 0, 2); browserPanel.getFlexCellFormatter().setColSpan(2, 0, 2); browserPanel.getCellFormatter().setHorizontalAlignment(2, 0, HasHorizontalAlignment.ALIGN_CENTER); filePanel = new FlexTable(); filePanel.setCellPadding(2); tabPanel.add(filePanel, "Local File", false); HorizontalPanel horizontalPanel_1 = new HorizontalPanel(); filePanel.setWidget(0, 0, horizontalPanel_1); loadPanel = new FormPanel(); loadPanel.setMethod(FormPanel.METHOD_POST); loadPanel.setEncoding(FormPanel.ENCODING_MULTIPART); loadPanel.setAction("loadData"); horizontalPanel_1.add(loadPanel); HorizontalPanel horizontalPanel_2 = new HorizontalPanel(); loadPanel.setWidget(horizontalPanel_2); horizontalPanel_2.setSize("100%", "100%"); fileUpload = new FileUpload(); fileUpload.setName("file"); horizontalPanel_2.add(fileUpload); clientKey = new Hidden("client"); horizontalPanel_2.add(clientKey); filePanel.getFlexCellFormatter().setColSpan(0, 0, 1); Button button = new Button("Save Data..."); filePanel.setWidget(1, 0, button); button.setText("Save File"); Button button_1 = new Button("Load Data..."); filePanel.setWidget(1, 1, button_1); button_1.setText("Load File"); filePanel.getFlexCellFormatter().setColSpan(0, 0, 2); filePanel.getCellFormatter().setHorizontalAlignment(1, 0, HasHorizontalAlignment.ALIGN_CENTER); filePanel.getCellFormatter().setHorizontalAlignment(1, 1, HasHorizontalAlignment.ALIGN_CENTER); button_1.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { loadFile(); } }); button.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { saveFile(); } }); textPanel = new FlexTable(); textPanel.setCellPadding(2); tabPanel.add(textPanel, "Copy/Paste", false); textArea = new TextArea(); textArea.setText( "Paste previously saved form data here and click \"Restore.\" Or press \"Current\" to paste current Form data."); textArea.setVisibleLines(5); textPanel.setWidget(0, 0, textArea); textArea.setSize("100%", ""); Button button_3 = new Button("Save Data..."); button_3.setText("Current"); textPanel.setWidget(1, 0, button_3); textArea.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { textArea.selectAll(); } }); nameField.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { nameField.selectAll(); } }); button_3.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { if (listener != null) { FormData data = listener.getFormData(); JSONObject obj = JsonUtil.toJSONObject(data); textArea.setText(JsonUtil.formatJsonText(obj.toString())); textArea.selectAll(); } } }); Button button_4 = new Button("Load Data..."); button_4.setText("Restore"); button_4.addClickHandler(new ClickHandler() { @Override public void onClick(ClickEvent event) { if (listener != null) { String text = textArea.getText(); FormData data = JsonUtil.parseFormData(text); listener.setFormData(data); textArea.setText(""); } } }); textPanel.setWidget(1, 1, button_4); textPanel.getFlexCellFormatter().setColSpan(0, 0, 2); textPanel.getCellFormatter().setHorizontalAlignment(1, 0, HasHorizontalAlignment.ALIGN_CENTER); textPanel.getCellFormatter().setHorizontalAlignment(1, 1, HasHorizontalAlignment.ALIGN_CENTER); flexTable_3.getFlexCellFormatter().setColSpan(0, 0, 1); storageList.addChangeHandler(new ChangeHandler() { @Override public void onChange(ChangeEvent event) { int i = storageList.getSelectedIndex(); if (i >= 0) { String name = storageList.getItemText(i); if (name != null) nameField.setText(name); } } }); } protected void renameLocalStorage() { String name = getName(); if (name != null) { final Storage s = getStorage(); if (s != null) { final int i = storageList.getSelectedIndex(); if (i < 0) { ApplicationPanel.showErrorDialog("Select a Storage entry"); } else { String key = storageList.getValue(i); String value = s.getItem(key); storageList.removeItem(i); s.removeItem(key); key = STORAGE_KEY + name; s.setItem(key, value); storageList.insertItem(name, key, i); } } } } protected void deleteLocalStorage() { final Storage s = getStorage(); if (s != null) { final int i = storageList.getSelectedIndex(); if (i < 0) { ApplicationPanel.showErrorDialog("Select a Storage entry"); } else { String key = storageList.getValue(i); storageList.removeItem(i); s.removeItem(key); } } } protected void restoreLocalStorage() { final Storage s = getStorage(); if (s != null) { final int i = storageList.getSelectedIndex(); if (i < 0) { ApplicationPanel.showErrorDialog("Select a Storage entry"); } else { String key = storageList.getValue(i); String value = s.getItem(key); if (value == null) value = ""; final String json = value; if (listener != null) { FormData data = JsonUtil.parseFormData(json); listener.setFormData(data); } } } } protected void saveLocalStorage() { final Storage s = getStorage(); if (s != null) { final int i = storageList.getSelectedIndex(); if (i < 0) { ApplicationPanel.showErrorDialog("Select a Storage entry"); } else { if (listener != null) { final FormData data = listener.getFormData(); JSONObject obj = JsonUtil.toJSONObject(data); String key = storageList.getValue(i); s.setItem(key, obj.toString()); ApplicationPanel.showInfoDialog("Configuration Saved."); } } } } private static final String STORAGE_KEY = "FormData."; protected void addLocalStorage() { final String name = getName(); if (name != null) { final Storage s = getStorage(); if (s != null) { final String key = STORAGE_KEY + name; if (s.getItem(key) != null) { ApplicationPanel.showErrorDialog("That entry already exists."); } else { final FormData data = listener.getFormData(); JSONObject obj = JsonUtil.toJSONObject(data); s.setItem(key, obj.toString()); storageList.addItem(name, key); storageList.setSelectedIndex(storageList.getItemCount() - 1); ApplicationPanel.showInfoDialog("Configuration Saved"); } } } } private Storage getStorage() { Storage s = Storage.getLocalStorageIfSupported(); if (s == null) { ApplicationPanel.showErrorDialog("Local Storage not supported by your browser"); } return s; } private String getName() { String name = nameField.getText(); if ((name == null) || (name.trim().length() == 0)) { ApplicationPanel.showErrorDialog("Enter a name"); return null; } else { return name; } } @Override public void onLoad() { tabPanel.selectTab(0); if (!Beans.isDesignTime()) { Storage s = Storage.getLocalStorageIfSupported(); if (s != null) { for (int i = 0; i < s.getLength(); i++) { String key = s.key(i); if ((key != null) && key.startsWith(STORAGE_KEY)) { String name = key.substring(STORAGE_KEY.length()); storageList.addItem(name, key); } } } } } protected void loadFile() { if (listener != null) { String file = fileUpload.getFilename(); if ((file == null) || (file.trim().length() == 0)) { ApplicationPanel.showErrorDialog("Error", "Please select a file"); return; } this.clientKey.setValue(String.valueOf(Math.random() + "." + Math.random())); this.loadPanel.submit(); AsyncTaskHandler dialog = ApplicationPanel.showWaitDialogBox("Please Wait", "Loading..."); int maxTries = 5; loadData(dialog, maxTries); } } private void loadData(final AsyncTaskHandler dialog, final int maxTries) { final String client = this.clientKey.getValue(); Service.getInstance().getClientData(client, new DefaultCallback<FormData>() { @Override protected void doOnSuccess(FormData result) { if (result == null) { if (maxTries > 0) loadData(dialog, maxTries - 1); else { ApplicationPanel.showErrorDialog("Error", "Unable to load file"); dialog.taskCompleted(); } } else { listener.setFormData(result); dialog.taskCompleted(); } } }); } protected void saveFile() { if (listener != null) { final FormData data = listener.getFormData(); JSONObject obj = JsonUtil.toJSONObject(data); MainPanel.saveFormData("dh-dps-calc.json", JsonUtil.formatJsonText(obj.toString()), "false"); } } public void setFormListener(FormListener listener) { this.listener = listener; } public interface FormListener { FormData getFormData(); void setFormData(FormData data); } }