Added argument name autocomplete

Author: Vitaliy Boyko

src/com/magento/idea/magento2plugin/actions/generation/dialog/InjectAViewModelDialog.java

@@ -8,6 +8,7 @@
 import com.intellij.openapi.project.Project;
 import com.intellij.psi.PsiFile;
 import com.intellij.psi.xml.XmlTag;
+import com.intellij.ui.DocumentAdapter;
 import com.magento.idea.magento2plugin.actions.generation.InjectAViewModelAction;
 import com.magento.idea.magento2plugin.actions.generation.data.ViewModelFileData;
 import com.magento.idea.magento2plugin.actions.generation.dialog.validator.InjectAViewModelDialogValidator;
@@ -17,6 +18,7 @@
 import com.magento.idea.magento2plugin.bundles.CommonBundle;
 import com.magento.idea.magento2plugin.bundles.ValidatorBundle;
 import com.magento.idea.magento2plugin.magento.packages.XsiTypes;
+import com.magento.idea.magento2plugin.util.FirstLetterToLowercaseUtil;
 import com.magento.idea.magento2plugin.util.magento.GetModuleNameByDirectoryUtil;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
@@ -30,6 +32,7 @@
 import javax.swing.JPanel;
 import javax.swing.JTextField;
 import javax.swing.KeyStroke;
+import javax.swing.event.DocumentEvent;
 import org.jetbrains.annotations.NotNull;
 
 public class InjectAViewModelDialog extends AbstractDialog {
@@ -69,7 +72,12 @@ public InjectAViewModelDialog(
         this.validatorBundle = new ValidatorBundle();
         this.commonBundle = new CommonBundle();
 
-        this.viewModelArgumentName.setText("viewModel");
+        this.viewModelClassName.getDocument().addDocumentListener(new DocumentAdapter() {
+            @Override
+            protected void textChanged(final @NotNull DocumentEvent event) {
+                updateArgumentText();
+            }
+        });
         this.viewModelDirectory.setText("ViewModel");
 
         setContentPane(contentPane);
@@ -107,6 +115,13 @@ public void actionPerformed(final ActionEvent event) {
                 JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
     }
 
+    protected void updateArgumentText() {
+        final String classNameText = this.viewModelClassName.getText();
+        this.viewModelArgumentName.setText(
+                FirstLetterToLowercaseUtil.convert(classNameText)
+        );
+    }
+
     protected void onOK() {
         if (!validator.validate(project)) {
             return;

src/com/magento/idea/magento2plugin/util/FirstLetterToLowercaseUtil.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+package com.magento.idea.magento2plugin.util;
+
+import java.util.Locale;
+
+public final class FirstLetterToLowercaseUtil {
+
+    private FirstLetterToLowercaseUtil() {}
+
+    /**
+     * Converts first letter of a string to lowercase.
+     * Eg: "FoO" -> "foO".
+     *
+     * @param string String
+     * @return String
+     */
+    public static String convert(final String string) {
+        if (string == null || string.length() == 0) {
+            return "";
+        }
+
+        final int minLength = 1;
+        if (string.length() == minLength) {
+            return string.toLowerCase(Locale.ROOT);
+        }
+
+        char[] chArr = string.toCharArray();
+        chArr[0] = Character.toLowerCase(chArr[0]);
+
+        return new String(chArr);
+    }
+}