Java tutorial
/* * Copyright (c) 2010 Automated Logic Corporation * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package com.controlj.addon.gwttree.client; import com.google.gwt.event.dom.client.ClickEvent; import com.google.gwt.event.dom.client.ClickHandler; import com.google.gwt.event.dom.client.KeyPressEvent; import com.google.gwt.event.dom.client.KeyPressHandler; import com.google.gwt.event.logical.shared.ValueChangeEvent; import com.google.gwt.event.logical.shared.ValueChangeHandler; import com.google.gwt.user.client.ui.*; import java.util.*; /**<!=========================================================================> This class is responsible for maintaining the set of tree options choosen by the user, and displays the dialog allowing those options to be changed. <!==========================================================================>*/ public class TreeOptions { private ChangedHandler handler; private State state = new State(); public TreeOptions(ChangedHandler handler) { this.handler = handler; } public void showDialog() { VerticalPanel dialogContents = new VerticalPanel(); dialogContents.setSpacing(4); // Add the tree type radio buttons RadioButton dynamicChoice = createTreeChoice("treeTypeGroup", "Dynamic Tree", false); RadioButton staticChoice = createTreeChoice("treeTypeGroup", "Static Tree", true); if (state.isStaticTree) staticChoice.setValue(true); else dynamicChoice.setValue(true); dialogContents.add(dynamicChoice); dialogContents.add(staticChoice); // Add filtering support dialogContents.add(new Label("Filter by trend name (leave empty to not filter)")); HorizontalPanel sourcesPanel = new HorizontalPanel(); sourcesPanel.setSpacing(10); final ListBox sourceListBox = new ListBox(true); sourceListBox.setSize("10em", "5em"); for (String sourceName : state.sourceNames) sourceListBox.addItem(sourceName); sourcesPanel.add(sourceListBox); VerticalPanel sourcesButtonPanel = new VerticalPanel(); sourcesButtonPanel.add(new Button("Add...", new ClickHandler() { @Override public void onClick(ClickEvent clickEvent) { final TextBox textBox = new TextBox(); Dialog.showInputDialog("Add Filter", textBox, new Dialog.Handler() { @Override public void setupButtons(final Button ok, final Button cancel) { textBox.addKeyPressHandler(new KeyPressHandler() { @Override public void onKeyPress(KeyPressEvent keyPressEvent) { if (keyPressEvent.getCharCode() == (char) 13) ok.click(); else if (keyPressEvent.getCharCode() == (char) 27) cancel.click(); } }); } @Override public void dialogClosed(boolean wasCancelled) { String name = textBox.getText().trim(); if (!wasCancelled && !name.isEmpty()) { state.sourceNames.add(name); sourceListBox.addItem(name); } } }); textBox.setFocus(true); } })); sourcesButtonPanel.add(new Button("Remove", new ClickHandler() { @Override public void onClick(ClickEvent clickEvent) { int count = sourceListBox.getItemCount(); for (int i = count - 1; i >= 0; i--) if (sourceListBox.isItemSelected(i)) { state.sourceNames.remove(sourceListBox.getItemText(i)); sourceListBox.removeItem(i); } } })); sourcesPanel.add(sourcesButtonPanel); dialogContents.add(sourcesPanel); final State originalState = state.copy(); Dialog.showInputDialog("Tree Options", dialogContents, new Dialog.Handler() { @Override public void setupButtons(Button ok, Button cancel) { } @Override public void dialogClosed(boolean wasCancelled) { if (wasCancelled) state = originalState; else if (!state.equals(originalState)) handler.optionsChanged(TreeOptions.this); } }); } private RadioButton createTreeChoice(String groupId, String label, final boolean isStatic) { RadioButton dynamicChoice = new RadioButton(groupId, label); dynamicChoice.addValueChangeHandler(new ValueChangeHandler<Boolean>() { @Override public void onValueChange(ValueChangeEvent<Boolean> event) { if (event.getValue()) state.isStaticTree = isStatic; } }); return dynamicChoice; } private Widget createButtonPanel(DialogBox dialogBox, State originalState) { HorizontalPanel buttonPanel = new HorizontalPanel(); buttonPanel.setSpacing(15); Button okButton = createButton("OK", dialogBox, false, originalState); buttonPanel.add(okButton); Button cancelButton = createButton("Cancel", dialogBox, true, null); buttonPanel.add(cancelButton); return buttonPanel; } private Button createButton(String label, final DialogBox dialogBox, final boolean isCancel, final State originalState) { return new Button(label, new ClickHandler() { public void onClick(ClickEvent event) { dialogBox.hide(); if (isCancel) state = originalState; else if (!state.equals(originalState)) handler.optionsChanged(TreeOptions.this); } }); } public boolean isStaticTree() { return state.isStaticTree; } public Set<String> getSourceNames() { return Collections.unmodifiableSet(state.sourceNames); } public String[] getSourceNamesArray() { return state.sourceNames.toArray(new String[state.sourceNames.size()]); } private static class State { boolean isStaticTree; Set<String> sourceNames = new TreeSet<String>(); State copy() { State state = new State(); state.isStaticTree = isStaticTree; state.sourceNames.addAll(sourceNames); return state; } @Override public boolean equals(Object o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; State state = (State) o; if (isStaticTree != state.isStaticTree) return false; if (!sourceNames.equals(state.sourceNames)) return false; return true; } @Override public int hashCode() { int result = isStaticTree ? 1 : 0; result = 31 * result + sourceNames.hashCode(); return result; } } public interface ChangedHandler { void optionsChanged(TreeOptions options); } }