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1
14
15 package wingset;
16
17 import org.wings.*;
18 import org.wings.border.SEmptyBorder;
19 import org.wings.event.SRenderEvent;
20 import org.wings.event.SRenderListener;
21 import org.wings.event.SInvalidLowLevelEventListener;
22 import org.wings.event.InvalidLowLevelEvent;
23
24 import java.awt.*;
25 import java.awt.event.ActionEvent  ;
26 import java.awt.event.ActionListener ;
27
28
37 public class BackButtonExample extends WingSetPane {
38 private final SForm mainPanel = new SForm();
39 private final SLabel epochLabel = new SLabel();
40 private final SButton newEpochButton = new SButton("After changing mode, click here SEVERAL times generate browser history entries");
41
42 private final SButton regularButton = new SButton("Regular button");
43 private final SLabel regularButtonSignal = new SLabel("Regular button pressed");
44
45 private final SButton virtualBackButton = new SButton("Virtual back button");
46 private final SLabel virtualBackButtonSignal = new SLabel("Virtual back button pressed");
47
48 private final SButton nonEpochedButton = new SButton("Non epoch-checked button");
49 private final SLabel nonEpochedButtonSignal = new SLabel("Non epoch-checked button pressed");
50
51 protected SComponent createExample() {
52 mainPanel.setLayout(new SFlowDownLayout());
53 mainPanel.setPreferredSize(new SDimension("300px", null));
54 mainPanel.setHorizontalAlignment(CENTER);
55 mainPanel.add(new SLabel("<html>wingS is able to handle browser back navigation in different ways<br><ul>" +
56 "<li><b>Default: </b>Drop requests from old views and just redisplay page</li>" +
57 "<li><b>Extended default: </b>Register a virtual \"back\" button and trigger this on back operations" +
58 "You can use this. i.e. to display a information message or for navigation purpose.</li>" +
59 "<li><b>Allow: </b>Allow & don't intercept back navigation. Modifications (i.e. clicks) on past pages will" +
60 "be ignored by default, but can be enabled via setEpochCheckEnabled() for selected components</li>" +
61 "</ul>" +
62 "<p>Below is some example to experiment with these different modes to handle back navigation"));
63
64 mainPanel.addRenderListener(new SRenderListener() {
65 public void startRendering(SRenderEvent e) {
66 epochLabel.setText("<html><p>Current epoch: <b>" + epochLabel.getParentFrame().getEventEpoch() + "</b><p>");
67 }
68
69 public void doneRendering(SRenderEvent e) {
70 virtualBackButtonSignal.setVisible(false);
71 regularButtonSignal.setVisible(false);
72 nonEpochedButtonSignal.setVisible(false);
73 }
74 });
75
76 virtualBackButton.addActionListener(new ActionListener () {
77 public void actionPerformed(ActionEvent e) {
78 virtualBackButtonSignal.setVisible(true);
79 }
80 });
81
82 SPanel signalPanel = new SPanel(new SFlowLayout());
83 signalPanel.add(virtualBackButtonSignal);
84 virtualBackButtonSignal.setBorder(new SEmptyBorder(10, 10, 10, 10));
85 virtualBackButtonSignal.setBackground(Color.YELLOW);
86 virtualBackButtonSignal.setFont(new SFont(SFont.BOLD));
87 virtualBackButtonSignal.setVisible(false);
88
89 signalPanel.add(regularButtonSignal);
90 regularButtonSignal.setBorder(new SEmptyBorder(10, 10, 10, 10));
91 regularButtonSignal.setBackground(Color.GREEN);
92 regularButtonSignal.setFont(new SFont(SFont.BOLD));
93 regularButtonSignal.setVisible(false);
94
95 signalPanel.add(nonEpochedButtonSignal);
96 nonEpochedButtonSignal.setBorder(new SEmptyBorder(10, 10, 10, 10));
97 nonEpochedButtonSignal.setBackground(Color.GREEN);
98 nonEpochedButtonSignal.setFont(new SFont(SFont.BOLD));
99 nonEpochedButtonSignal.setVisible(false);
100 mainPanel.add(signalPanel);
101
102 regularButton.setVisible(false);
103 nonEpochedButton.setVisible(false);
104
105 final SButtonGroup buttonGroup = new SButtonGroup();
106 final SRadioButton postMode = new SRadioButton("<html><b>Default:</b> HTTP POST " +
107 "(Browsers present a 'repost form' query after submits. wingS can optionally identify back operations");
108 final SRadioButton getMode = new SRadioButton("<html><b>Extended default:</b> HTTP GET mode (Browsers <i>don't</i> present" +
109 " a 'repost form' query. wingS <i>immediately</i> catches back operations and triggers virtual back button)");
110 final SRadioButton getMode2 = new SRadioButton("<html><b>Allow:</b> HTTP GET mode and no page refresh on back navigation." +
111 "wingS doesn't catch back navigation and may allow manipulation on selected buttons. " +
112 "<br>Clicks on <b>regular</b> buttons lead to an <i>delayed</i> back button event." +
113 "<br>Clicks on <b>Not epoch-checked button</b> will be accepted.");
114 buttonGroup.add(postMode);
115 buttonGroup.add(getMode);
116 buttonGroup.add(getMode2);
117 postMode.setSelected(true);
118 mainPanel.add(postMode);
119 mainPanel.add(getMode);
120 mainPanel.add(getMode2);
121
122 buttonGroup.addActionListener(new ActionListener () {
123 public void actionPerformed(ActionEvent e) {
124 regularButton.setVisible(false);
125 nonEpochedButton.setVisible(false);
126
127 if (buttonGroup.getSelection() == postMode) {
128 mainPanel.setPostMethod(true);
129 mainPanel.getParentFrame().setNoCaching(true);
130 } else if (buttonGroup.getSelection() == getMode) {
131 mainPanel.setPostMethod(false);
132 mainPanel.getParentFrame().setNoCaching(true);
133 } else if (buttonGroup.getSelection() == getMode2) {
134 mainPanel.setPostMethod(false);
135 mainPanel.getParentFrame().setNoCaching(false);
136 nonEpochedButton.setEpochCheckEnabled(false);
138 postMode.setEpochCheckEnabled(false);
141 getMode.setEpochCheckEnabled(false);
142 getMode2.setEpochCheckEnabled(false);
143 mainPanel.setEpochCheckEnabled(false);
144 regularButton.setVisible(true);
145 nonEpochedButton.setVisible(true);
146 }
147 }
148 });
149
150 mainPanel.add(epochLabel);
151
152 newEpochButton.addActionListener(new ActionListener () {
153 public void actionPerformed(ActionEvent e) {
154 mainPanel.reload(); }
156 });
157 mainPanel.add(newEpochButton);
158
159
160 regularButton.addActionListener(new ActionListener () {
161 public void actionPerformed(ActionEvent e) {
162 regularButtonSignal.setVisible(true);
163 }
164 });
165 mainPanel.add(regularButton);
166
167 nonEpochedButton.addActionListener(new ActionListener () {
168 public void actionPerformed(ActionEvent e) {
169 nonEpochedButtonSignal.setVisible(true);
170 }
171 });
172 mainPanel.add(nonEpochedButton);
173
174 return mainPanel;
175 }
176
177 protected void initializePanel() {
178 super.initializePanel(); mainPanel.getParentFrame().setBackButton(virtualBackButton);
180
181 mainPanel.getParentFrame().addInvalidLowLevelEventListener(new SInvalidLowLevelEventListener() {
182 public void invalidLowLevelEvent(InvalidLowLevelEvent e) {
183 log.info("Invalid Low-Level event detected on "+e.getSource());
184 }
185 });
186 }
187
188 }
189 |
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