UI defaults inspector: initial commit with basic functionality

flatlaf-core/src/main/java/com/formdev/flatlaf/util/ScaledEmptyBorder.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.util;
+
+import static com.formdev.flatlaf.util.UIScale.scale;
+import java.awt.Component;
+import java.awt.Insets;
+import javax.swing.border.EmptyBorder;
+
+/**
+ * Empty border that scales insets.
+ *
+ * @author Karl Tauber
+ */
+public class ScaledEmptyBorder
+	extends EmptyBorder
+{
+	public ScaledEmptyBorder( int top, int left, int bottom, int right ) {
+		super( top, left, bottom, right );
+	}
+
+	public ScaledEmptyBorder( Insets insets ) {
+		super( insets );
+	}
+
+	@Override
+	public Insets getBorderInsets() {
+		return new Insets( scale( top ), scale( left ), scale( bottom ), scale( right ) );
+	}
+
+	@Override
+	public Insets getBorderInsets( Component c, Insets insets ) {
+		insets.left = scale( left );
+		insets.top = scale( top );
+		insets.right = scale( right );
+		insets.bottom = scale( bottom );
+		return insets;
+	}
+}