update to accommodate multiple selections

Author: Jugen

richtextfx/src/main/java/org/fxmisc/richtext/ParagraphText.java

@@ -104,6 +104,7 @@ public ObjectProperty<Paint> highlightTextFillProperty() {
                 p.layoutYProperty().unbind();
 
                 getChildren().remove(p);
+                resetTextSelection(p);
             }
             if (change.wasAdded()) {
                 SelectionPath p = change.getValueAdded();
@@ -139,22 +140,15 @@ public ObjectProperty<Paint> highlightTextFillProperty() {
         };
         carets.addListener( caretNodeListener );
 
-        // XXX: see the note at highlightTextFill
-//        highlightTextFill.addListener(new ChangeListener<Paint>() {
-//            @Override
-//            public void changed(ObservableValue<? extends Paint> observable,
-//                    Paint oldFill, Paint newFill) {
-//                for(PumpedUpText text: textNodes())
-//                    text.selectionFillProperty().set(newFill);
-//            }
-//        });
+        highlightTextFill.addListener((ob,oldFill,newFill) -> getChildren().stream()
+            .filter( n -> n instanceof TextExt).map( n -> (TextExt) n )
+            .forEach( t -> t.selectionFillProperty().set(newFill) )
+        );
 
         // populate with text nodes
         par.getStyledSegments().stream().map(nodeFactory).forEach(n -> {
             if (n instanceof TextExt) {
                 TextExt t = (TextExt) n;
-                // XXX: binding selectionFill to textFill,
-                // see the note at highlightTextFill
                 t.selectionFillProperty().bind(highlightTextFill);
             }
             getChildren().add(n);
@@ -231,7 +225,7 @@ void dispose() {
         carets.removeListener( caretNodeListener );
 
         getChildren().stream().filter( n -> n instanceof TextExt ).map( n -> (TextExt) n )
-        .forEach( t -> t.selectionFillProperty().unbind() ); 
+        .forEach( t -> t.selectionFillProperty().unbind() );
 
         try { getChildren().clear(); }
         catch ( Exception EX ) {}
@@ -336,6 +330,7 @@ private void updateAllSelectionShapes() {
 
     private void updateSingleSelection(SelectionPath path) {
         path.getElements().setAll(getRangeShapeSafely(path.rangeProperty().getValue()));
+        updateTextSelection(path);
     }
 
     private PathElement[] getRangeShapeSafely(IndexRange range) {
@@ -435,32 +430,79 @@ private PathElement[] createRectangle(double topLeftX, double topLeftY, double b
         };
     }
 
+
     // XXX: Because of JDK bug https://bugs.openjdk.java.net/browse/JDK-8149134
     //      this does not work correctly if a paragraph contains more than one segment
     //      and the selection is (also) in the second or later segments.
     //      Visually the text color of the selection may be mix black & white.
-    private void updateTextSelection() {
-        int selStart = selection.get().getStart();
-        int selEnd = selection.get().getEnd();
+    private void updateTextSelection(SelectionPath selection)
+    {
+        IndexRange range = selection.rangeProperty().getValue();
+        if (range.getLength() == 0) {
+            resetTextSelection(selection);
+            return;
+        }
 
-        int start = 0;
-        FilteredList<Node> nodeList = getChildren().filtered(node -> node instanceof TextExt);
-        for (Node node : nodeList) {
-            TextExt text = (TextExt) node;
-            int end = start + text.getText().length();
+        int selStart = range.getStart();
+        int selEnd = range.getEnd();
+        int charSoFar = 0;
 
-            int textSelStart = Math.max(start, selStart);
-            int textSelEnd = Math.min(end, selEnd);
-            if (textSelEnd > textSelStart) {
-                textSelStart -= start;
-                textSelEnd -= start;
-            } else {
-                textSelStart = textSelEnd = -1;
+        for (Node node : getChildren())
+        {
+            if (node instanceof TextExt)
+            {
+                TextExt text = (TextExt) node;
+                int len = text.getText().length();
+                int end = charSoFar + len;
+
+                if (end > selStart)
+                {
+                    // TODO text.setSelectionFill(selection.getTextFill());
+
+                    if (selStart <= charSoFar) text.setSelectionStart(0);
+                    else text.setSelectionStart(selStart-charSoFar);
+
+                    if (selEnd > end) text.setSelectionEnd(len);
+                    else
+                    {
+                        text.setSelectionEnd(selEnd-charSoFar);
+                        break;
+                    }
+                }
+                charSoFar = end;
+            }
+            else if (node.isManaged()) // custom user nodes
+            {
+                charSoFar++;
             }
-            text.setImpl_selectionStart(textSelStart);
-            text.setImpl_selectionEnd(textSelEnd);
+        }
+    }
 
-            start = end;
+    private void resetTextSelection(SelectionPath selection)
+    {
+        IndexRange range = selection.rangeProperty().getValue();
+        int selStart = range.getStart();
+        int selEnd = range.getEnd();
+        int charSoFar = 0;
+
+        for (Node node : getChildren())
+        {
+            if (node instanceof TextExt)
+            {
+                TextExt text = (TextExt) node;
+                charSoFar += text.getText().length();
+
+                if (charSoFar >= selStart)
+                {
+                    text.setSelectionStart(-1);
+                    text.setSelectionEnd(-1);
+                    if (charSoFar >= selEnd) break;
+                }
+            }
+            else if (node.isManaged()) // custom user nodes
+            {
+                charSoFar++;
+            }
         }
     }
 
@@ -511,9 +553,8 @@ public String toString() {
     @Override
     protected void layoutChildren() {
         super.layoutChildren();
-        updateCaretShape();
-        updateSelectionShape();
-        updateTextSelection();
+        updateAllCaretShapes();
+        updateAllSelectionShapes();
         updateBackgroundShapes();
     }
 
@@ -543,7 +584,7 @@ private void updateSharedShapeRange(T value, int start, int end, BiFunction<T, T
             Runnable addNewValueRange = () -> ranges.add(Tuples.t(value, new IndexRange(start, end)));
 
             if (ranges.isEmpty()) {
-                addNewValueRange.run();;
+                addNewValueRange.run();
             } else {
                 int lastIndex = ranges.size() - 1;
                 Tuple2<T, IndexRange> lastShapeValueRange = ranges.get(lastIndex);