Initial implementation of "Rename Local Variable" refactoring.

editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/refactoring/DelegateUIHelper.java

Index: editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/refactoring/DelegateUIHelper.java
diff --git a/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/refactoring/DelegateUIHelper.java b/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/refactoring/DelegateUIHelper.java
new file mode 100644
index 0000000000000000000000000000000000000000..244796276588c99c5bab13ceb3578802e5c7397c
--- /dev/null
+++ b/editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/refactoring/DelegateUIHelper.java
@@ -0,0 +1,113 @@
+package com.google.dart.tools.ui.internal.refactoring;
+
+import com.google.dart.tools.internal.corext.refactoring.tagging.IDelegateUpdating;
+import com.google.dart.tools.ui.DartToolsPlugin;
+
+import org.eclipse.ltk.core.refactoring.Refactoring;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.events.SelectionAdapter;
+import org.eclipse.swt.events.SelectionEvent;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Composite;
+
+/**
+ * This is a helper class to keep a consistent design between refactorings capable of creating
+ * delegates.
+ */
+public class DelegateUIHelper {
+
+  /**
+   * Dialog settings key (value is of type boolean).
+   */
+  public static final String DELEGATE_UPDATING = "delegateUpdating"; //$NON-NLS-1$
+
+  /**
+   * Dialog settings key (value is of type boolean).
+   */
+  public static final String DELEGATE_DEPRECATION = "delegateDeprecation"; //$NON-NLS-1$
+
+  public static Button generateDeprecateDelegateCheckbox(Composite parent, Refactoring refactoring) {
+    final IDelegateUpdating updating = (IDelegateUpdating) refactoring.getAdapter(IDelegateUpdating.class);
+    if (updating == null || !updating.canEnableDelegateUpdating()) {
+      return null;
+    }
+    final Button button = createCheckbox(parent, getDeprecateDelegateCheckBoxTitle(),
+        loadDeprecateDelegateSetting(updating));
+    updating.setDeprecateDelegates(button.getSelection());
+    button.addSelectionListener(new SelectionAdapter() {
+
+      @Override
+      public void widgetSelected(SelectionEvent e) {
+        updating.setDeprecateDelegates(button.getSelection());
+      }
+    });
+    return button;
+  }
+
+  public static Button generateLeaveDelegateCheckbox(Composite parent, Refactoring refactoring,
+      boolean plural) {
+    final IDelegateUpdating updating = (IDelegateUpdating) refactoring.getAdapter(IDelegateUpdating.class);
+    if (updating == null || !updating.canEnableDelegateUpdating()) {
+      return null;
+    }
+    final Button button = createCheckbox(parent, updating.getDelegateUpdatingTitle(plural),
+        loadLeaveDelegateSetting(updating));
+    updating.setDelegateUpdating(button.getSelection());
+    button.addSelectionListener(new SelectionAdapter() {
+
+      @Override
+      public void widgetSelected(SelectionEvent e) {
+        updating.setDelegateUpdating(button.getSelection());
+      }
+    });
+    return button;
+  }
+
+  public static String getDeprecateDelegateCheckBoxTitle() {
+    return RefactoringMessages.DelegateCreator_deprecate_delegates;
+  }
+
+  public static boolean loadDeprecateDelegateSetting(IDelegateUpdating refactoring) {
+    return getBooleanSetting(DELEGATE_DEPRECATION, refactoring.getDeprecateDelegates());
+  }
+
+  public static boolean loadLeaveDelegateSetting(IDelegateUpdating refactoring) {
+    return getBooleanSetting(DELEGATE_UPDATING, refactoring.getDelegateUpdating());
+  }
+
+  // ************** Helper methods *******************
+
+  public static void saveDeprecateDelegateSetting(Button button) {
+    saveBooleanSetting(DELEGATE_DEPRECATION, button);
+  }
+
+  public static void saveLeaveDelegateSetting(Button button) {
+    saveBooleanSetting(DELEGATE_UPDATING, button);
+  }
+
+  private static Button createCheckbox(Composite parent, String title, boolean value) {
+    Button checkBox = new Button(parent, SWT.CHECK);
+    checkBox.setText(title);
+    checkBox.setSelection(value);
+    return checkBox;
+  }
+
+  private static boolean getBooleanSetting(String key, boolean defaultValue) {
+    String update = DartToolsPlugin.getDefault().getDialogSettings().get(key);
+    if (update != null) {
+      return Boolean.valueOf(update).booleanValue();
+    } else {
+      return defaultValue;
+    }
+  }
+
+  private static void saveBooleanSetting(String key, Button button) {
+    if (button != null && !button.isDisposed() && button.getEnabled()) {
+      DartToolsPlugin.getDefault().getDialogSettings().put(key, button.getSelection());
+    }
+  }
+
+  private DelegateUIHelper() {
+    // no instances
+  }
+}