Add help dialog.

src/main/java/info/augendre/caps_extractor/HelpAction.java

@@ -0,0 +1,21 @@
+package info.augendre.caps_extractor;
+
+import javax.swing.*;
+import java.awt.event.ActionEvent;
+
+/**
+ * Created by Gabriel.
+ */
+public class HelpAction extends AbstractAction {
+    public HelpAction() {
+        super(I18nSupport.translate("plain.help_title"));
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        JDialog help = new HelpDialog();
+        help.pack();
+        help.setLocationRelativeTo(null);
+        help.setVisible(true);
+    }
+}

src/main/java/info/augendre/caps_extractor/HelpDialog.form

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="info.augendre.caps_extractor.HelpDialog">
+  <grid id="cbd77" binding="contentPane" layout-manager="GridLayoutManager" row-count="2" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+    <margin top="10" left="10" bottom="10" right="10"/>
+    <constraints>
+      <xy x="48" y="54" width="436" height="297"/>
+    </constraints>
+    <properties/>
+    <border type="none"/>
+    <children>
+      <grid id="94766" layout-manager="GridLayoutManager" row-count="1" column-count="2" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+        <margin top="0" left="0" bottom="0" right="0"/>
+        <constraints>
+          <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="1" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <hspacer id="98af6">
+            <constraints>
+              <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="1" hsize-policy="6" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+            </constraints>
+          </hspacer>
+          <grid id="9538f" layout-manager="GridLayoutManager" row-count="1" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+            <margin top="0" left="0" bottom="0" right="0"/>
+            <constraints>
+              <grid row="0" column="1" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties/>
+            <border type="none"/>
+            <children>
+              <component id="e7465" class="javax.swing.JButton" binding="buttonOK">
+                <constraints>
+                  <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+                </constraints>
+                <properties>
+                  <text value="OK"/>
+                </properties>
+              </component>
+            </children>
+          </grid>
+        </children>
+      </grid>
+      <grid id="e3588" layout-manager="GridLayoutManager" row-count="1" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+        <margin top="0" left="0" bottom="0" right="0"/>
+        <constraints>
+          <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <component id="4636a" class="javax.swing.JLabel" binding="helpField">
+            <constraints>
+              <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="8" fill="0" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties>
+              <text value="Label"/>
+            </properties>
+          </component>
+        </children>
+      </grid>
+    </children>
+  </grid>
+</form>

src/main/java/info/augendre/caps_extractor/HelpDialog.java

@@ -0,0 +1,97 @@
+package info.augendre.caps_extractor;
+
+import com.intellij.uiDesigner.core.GridConstraints;
+import com.intellij.uiDesigner.core.GridLayoutManager;
+import com.intellij.uiDesigner.core.Spacer;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class HelpDialog extends JDialog {
+    private JPanel contentPane;
+    private JButton buttonOK;
+    private JLabel helpField;
+
+    public HelpDialog() {
+        setContentPane(contentPane);
+        setModal(true);
+        getRootPane().setDefaultButton(buttonOK);
+
+        this.setTitle(I18nSupport.translate("plain.help_title"));
+
+        String helpText = "<HTML>" +
+                "<p>" +
+                I18nSupport.translate("help.content") +
+                "</p>" +
+                "</HTML>";
+
+        helpField.setText(helpText);
+
+        buttonOK.addActionListener(e -> onOK());
+
+        buttonOK.addActionListener(e -> onOK());
+
+        // call onCancel() when cross is clicked
+        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
+        addWindowListener(new WindowAdapter() {
+            public void windowClosing(WindowEvent e) {
+                onCancel();
+            }
+        });
+
+        // call onCancel() on ESCAPE
+        contentPane.registerKeyboardAction(e -> onCancel(), KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
+    }
+
+    private void onOK() {
+        dispose();
+    }
+
+    private void onCancel() {
+        dispose();
+    }
+
+    {
+// GUI initializer generated by IntelliJ IDEA GUI Designer
+// >>> IMPORTANT!! <<<
+// DO NOT EDIT OR ADD ANY CODE HERE!
+        $$$setupUI$$$();
+    }
+
+    /**
+     * Method generated by IntelliJ IDEA GUI Designer
+     * >>> IMPORTANT!! <<<
+     * DO NOT edit this method OR call it in your code!
+     *
+     * @noinspection ALL
+     */
+    private void $$$setupUI$$$() {
+        contentPane = new JPanel();
+        contentPane.setLayout(new GridLayoutManager(2, 1, new Insets(10, 10, 10, 10), -1, -1));
+        final JPanel panel1 = new JPanel();
+        panel1.setLayout(new GridLayoutManager(1, 2, new Insets(0, 0, 0, 0), -1, -1));
+        contentPane.add(panel1, new GridConstraints(1, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_BOTH, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, 1, null, null, null, 0, false));
+        final Spacer spacer1 = new Spacer();
+        panel1.add(spacer1, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_HORIZONTAL, GridConstraints.SIZEPOLICY_WANT_GROW, 1, null, null, null, 0, false));
+        final JPanel panel2 = new JPanel();
+        panel2.setLayout(new GridLayoutManager(1, 1, new Insets(0, 0, 0, 0), -1, -1));
+        panel1.add(panel2, new GridConstraints(0, 1, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_BOTH, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, null, null, null, 0, false));
+        buttonOK = new JButton();
+        buttonOK.setText("OK");
+        panel2.add(buttonOK, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_HORIZONTAL, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, GridConstraints.SIZEPOLICY_FIXED, null, null, null, 0, false));
+        final JPanel panel3 = new JPanel();
+        panel3.setLayout(new GridLayoutManager(1, 1, new Insets(0, 0, 0, 0), -1, -1));
+        contentPane.add(panel3, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_CENTER, GridConstraints.FILL_BOTH, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, GridConstraints.SIZEPOLICY_CAN_SHRINK | GridConstraints.SIZEPOLICY_CAN_GROW, null, null, null, 0, false));
+        helpField = new JLabel();
+        helpField.setText("Label");
+        panel3.add(helpField, new GridConstraints(0, 0, 1, 1, GridConstraints.ANCHOR_WEST, GridConstraints.FILL_NONE, GridConstraints.SIZEPOLICY_FIXED, GridConstraints.SIZEPOLICY_FIXED, null, null, null, 0, false));
+    }
+
+    /**
+     * @noinspection ALL
+     */
+    public JComponent $$$getRootComponent$$$() {
+        return contentPane;
+    }
+}

src/main/java/info/augendre/caps_extractor/MainWindow.java

@@ -16,6 +16,8 @@ public class MainWindow extends JFrame {
         JMenuBar menuBar = new JMenuBar();
         JMenu help = new JMenu(I18nSupport.translate("menu.help"));
         menuBar.add(help);
+        JMenuItem helpItem = new JMenuItem(new HelpAction());
+        help.add(helpItem);
         JMenuItem about = new JMenuItem(new AboutAction());
         help.add(about);
         return menuBar;

src/main/resources/info/augendre/caps_extractor/strings.properties

@@ -3,4 +3,7 @@ label.output=&Output\:
 plain.about_title=A propos
 plain.dev=Developer
 menu.help=Help
-plain.title=Caps Extractor
+plain.title=Caps Extractor
+help.content=Enter some text in the first box.<br>\
+All the upper case letters will be reflected in the latter box.
+plain.help_title=Help

src/main/resources/info/augendre/caps_extractor/strings_fr.properties

@@ -3,4 +3,7 @@ label.output=&Sortie \:
 plain.about_title=A propos
 plain.dev=D\u00E9veloppeur
 menu.help=Aide
-plain.title=Extracteur de majuscules
+plain.title=Extracteur de majuscules
+help.content=Entrez du texte dans le premier champ.<br>\
+Toutes les lettres majuscules seront r\u00E9p\u00E9t\u00E9es dans le second champ.
+plain.help_title=Aide