Better API for handling MonitorAware Coordinates

This commit contributes to providing better interfaces and APIs for
handling MontiorAware Rectangles and Points with Abstraction.

contributes to
#62 and
#128

Author: amartya4256

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/Copyable.java

@@ -0,0 +1,8 @@
+package org.eclipse.swt.graphics;
+
+/**
+ * @since 3.130
+ */
+public interface Copyable<T> {
+	public T copy();
+}

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/MonitorAwareRectangle.java

@@ -61,4 +61,14 @@ public int hashCode() {
 		return super.hashCode();
 	}
 
+	 @Override
+    public Rectangle copy() {
+        return new MonitorAwareRectangle(x, y, width, height, monitor);
+    }
+
+    @Override
+    public Rectangle copyWith(int dx, int dy, int dWidth, int dHeight) {
+        return new MonitorAwareRectangle(x + dx, y + dy, width + dWidth, height + dHeight, monitor);
+    }
+
 }

bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/graphics/Rectangle.java

@@ -45,7 +45,7 @@
  * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
  */
 
-public sealed class Rectangle implements Serializable permits MonitorAwareRectangle {
+public sealed class Rectangle implements Serializable, Copyable<Rectangle> permits MonitorAwareRectangle {
 
 	/**
 	 * the x coordinate of the rectangle
@@ -356,4 +356,29 @@ public Rectangle union (Rectangle rect) {
 	return new Rectangle (left, top, right - left, bottom - top);
 }
 
+/**
+ * @since 3.130
+ */
+public static Rectangle of(Point topLeft, int width, int height) {
+	if(topLeft instanceof MonitorAwarePoint monitorAwareTopLeft) {
+		return new MonitorAwareRectangle(topLeft.x, topLeft.y, width, height, monitorAwareTopLeft.getMonitor());
+	}
+	return new Rectangle(topLeft.x, topLeft.y, width, height);
+}
+
+/**
+ * @since 3.130
+ */
+@Override
+public Rectangle copy() {
+	return new Rectangle(x, y, width, height);
+}
+
+/**
+ * @since 3.130
+ */
+public Rectangle copyWith(int dx, int dy, int dWidth, int dHeight) {
+    return new Rectangle(x + dx, y + dy, width + dWidth, height + dHeight);
+}
+
 }