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-rw-r--r--src/jcgp/gui/dragresize/HorizontalDragResize.java131
-rw-r--r--src/jcgp/gui/dragresize/VerticalDragResize.java132
2 files changed, 263 insertions, 0 deletions
diff --git a/src/jcgp/gui/dragresize/HorizontalDragResize.java b/src/jcgp/gui/dragresize/HorizontalDragResize.java
new file mode 100644
index 0000000..e88eafd
--- /dev/null
+++ b/src/jcgp/gui/dragresize/HorizontalDragResize.java
@@ -0,0 +1,131 @@
+package jcgp.gui.dragresize;
+
+import javafx.event.EventHandler;
+import javafx.scene.Cursor;
+import javafx.scene.input.MouseEvent;
+import javafx.scene.layout.Region;
+import jcgp.gui.constants.Constants;
+
+/**
+ * This class adds horizontal drag resize functionality to any
+ * arbitrary region provided. This is done by using the static
+ * method {@code makeDragResizable()}.
+ * <br><br>
+ * This is based on a class by Andrew Till found on:
+ * http://andrewtill.blogspot.co.uk/2012/12/dragging-to-resize-javafx-region.html
+ *
+ */
+public class HorizontalDragResize {
+
+ private boolean dragging = false;
+ private final Region region;
+
+ /**
+ * For internal use only, creates an instance of the actual
+ * resizer used.
+ *
+ * @param region the region to make resizable.
+ */
+ private HorizontalDragResize(Region region) {
+ this.region = region;
+ }
+
+ /**
+ * Makes the specified region drag resizable.
+ * This particular implementation only creates a resize
+ * click-and-drag area on the left side of the region.
+ * The resize area is defined by {@code GUI.RESIZE_MARGIN}.
+ *
+ * @param region the region to make resizable.
+ */
+ public static void makeDragResizable(final Region region) {
+ // make the instance, this actually performs the resizing
+ final HorizontalDragResize dr = new HorizontalDragResize(region);
+
+ // set mouse listeners
+ region.setOnMousePressed(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mousePressed(event);
+ }
+ });
+ region.setOnMouseDragged(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mouseDragged(event);
+ }
+ });
+ region.setOnMouseMoved(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mouseMoved(event);
+ }
+ });
+ region.setOnMouseReleased(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mouseReleased();
+ }
+ });
+
+ }
+
+ /**
+ * If the press happened in the resize area, raise the drag flag.
+ *
+ * @param event the associated mouse event.
+ */
+ private void mousePressed(MouseEvent event) {
+ if(isInDraggableZone(event)) {
+ dragging = true;
+ }
+ }
+
+ /**
+ * If drag flag is high, resize the region to match the mouse position.
+ *
+ * @param event the associated mouse event.
+ */
+ private void mouseDragged(MouseEvent event) {
+ if(dragging) {
+ double newWidth = region.getWidth() - event.getX();
+ if (newWidth >= region.getMinWidth()) {
+ region.setPrefWidth(newWidth);
+ } else {
+ region.setPrefWidth(region.getMinWidth());
+ }
+ }
+ }
+
+ /**
+ * Change the cursor if the mouse position overlaps with the resize area.
+ *
+ * @param event the associated mouse event.
+ */
+ private void mouseMoved(MouseEvent event) {
+ if(isInDraggableZone(event) || dragging) {
+ region.setCursor(Cursor.H_RESIZE);
+ } else {
+ region.setCursor(Cursor.DEFAULT);
+ }
+ }
+
+ /**
+ * Finish resizing.
+ */
+ private void mouseReleased() {
+ dragging = false;
+ region.setCursor(Cursor.DEFAULT);
+ }
+
+ /**
+ * Assert whether the mouse cursor is in the draggable area defined by {@code GUI.RESIZE_MARGIN}.
+ *
+ * @param event the associated mouse event.
+ * @return true if the mouse position is in the draggable area.
+ */
+ private boolean isInDraggableZone(MouseEvent event) {
+ return event.getX() < (Constants.RESIZE_MARGIN);
+ }
+
+}
diff --git a/src/jcgp/gui/dragresize/VerticalDragResize.java b/src/jcgp/gui/dragresize/VerticalDragResize.java
new file mode 100644
index 0000000..4f784e5
--- /dev/null
+++ b/src/jcgp/gui/dragresize/VerticalDragResize.java
@@ -0,0 +1,132 @@
+package jcgp.gui.dragresize;
+
+import javafx.event.EventHandler;
+import javafx.scene.Cursor;
+import javafx.scene.input.MouseEvent;
+import javafx.scene.layout.Region;
+import jcgp.gui.constants.Constants;
+
+/**
+ * This class adds vertical drag resize functionality to any
+ * arbitrary region provided. This is done by using the static
+ * method {@code makeDragResizable()}.
+ * <br><br>
+ * This is based on a class by Andrew Till found on:
+ * http://andrewtill.blogspot.co.uk/2012/12/dragging-to-resize-javafx-region.html
+ *
+ */
+public class VerticalDragResize {
+
+ private boolean dragging = false;
+ private final Region region;
+
+ /**
+ * For internal use only, creates an instance of the actual
+ * resizer used.
+ *
+ * @param region the region to make resizable.
+ */
+ private VerticalDragResize(Region region) {
+ this.region = region;
+ }
+
+ /**
+ * Makes the specified region drag resizable.
+ * This particular implementation only creates a resize
+ * click-and-drag area on the top side of the region.
+ * The resize area is defined by {@code GUI.RESIZE_MARGIN}.
+ *
+ * @param region the region to make resizable.
+ */
+ public static void makeDragResizable(final Region region) {
+ // make the instance, this actually performs the resizing
+ final VerticalDragResize dr = new VerticalDragResize(region);
+
+ // set mouse listeners
+ region.setOnMousePressed(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mousePressed(event);
+ }
+ });
+ region.setOnMouseDragged(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mouseDragged(event);
+ }
+ });
+ region.setOnMouseMoved(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mouseMoved(event);
+ }
+ });
+ region.setOnMouseReleased(new EventHandler<MouseEvent>() {
+ @Override
+ public void handle(MouseEvent event) {
+ dr.mouseReleased();
+ }
+ });
+
+ }
+
+ /**
+ * If the press happened in the resize area, raise the drag flag.
+ *
+ * @param event the associated mouse event.
+ */
+ private void mousePressed(MouseEvent event) {
+ if(isInDraggableZone(event)) {
+ dragging = true;
+ }
+ }
+
+ /**
+ * If drag flag is high, resize the region to match the mouse position.
+ *
+ * @param event the associated mouse event.
+ */
+ private void mouseDragged(MouseEvent event) {
+ if(dragging) {
+ double newHeight = region.getHeight() - event.getY();
+ if (newHeight >= region.getMinHeight()) {
+ region.setPrefHeight(newHeight);
+ } else {
+ region.setPrefHeight(region.getMinHeight());
+ }
+ }
+ }
+
+ /**
+ * Change the cursor if the mouse position overlaps with the resize area.
+ *
+ * @param event the associated mouse event.
+ */
+ private void mouseMoved(MouseEvent event) {
+ if(isInDraggableZone(event) || dragging) {
+ region.setCursor(Cursor.V_RESIZE);
+ }
+ else {
+ region.setCursor(Cursor.DEFAULT);
+ }
+ }
+
+ /**
+ * Finish resizing.
+ */
+ private void mouseReleased() {
+ dragging = false;
+ region.setCursor(Cursor.DEFAULT);
+ }
+
+ /**
+ * Assert whether the mouse cursor is in the draggable area defined by {@code GUI.RESIZE_MARGIN}.
+ *
+ * @param event the associated mouse event.
+ * @return true if the mouse position is in the draggable area.
+ */
+ private boolean isInDraggableZone(MouseEvent event) {
+ return event.getY() < (Constants.RESIZE_MARGIN);
+ }
+
+}