1+ package org .fxmisc .richtext ;
2+
3+ import static org .fxmisc .richtext .model .TwoDimensional .Bias .*;
4+
5+ import java .util .ArrayList ;
6+ import java .util .List ;
7+
8+ import javafx .geometry .Point2D ;
9+ import javafx .geometry .Rectangle2D ;
10+ import javafx .scene .control .IndexRange ;
11+ import org .fxmisc .richtext .model .TwoLevelNavigator ;
12+
13+ import javafx .scene .shape .PathElement ;
14+ import javafx .scene .text .HitInfo ;
15+ import javafx .scene .text .TextFlow ;
16+ import javafx .scene .shape .LineTo ;
17+ import javafx .scene .shape .MoveTo ;
18+
19+ /**
20+ * Adds additional API to {@link TextFlow}.
21+ */
22+ class TextFlowExt extends TextFlow {
23+
24+ private TextFlowLayout layout ;
25+
26+ private TextFlowLayout textLayout ()
27+ {
28+ if ( layout == null ) {
29+ layout = new TextFlowLayout ( this , getManagedChildren () );
30+ }
31+ return layout ;
32+ }
33+
34+ int getLineCount () {
35+ return textLayout ().getLineCount ();
36+ }
37+
38+ int getLineStartPosition (int charIdx ) {
39+ TwoLevelNavigator navigator = textLayout ().getTwoLevelNavigator ();
40+ int currentLineIndex = navigator .offsetToPosition (charIdx , Forward ).getMajor ();
41+ return navigator .position (currentLineIndex , 0 ).toOffset ();
42+ }
43+
44+ int getLineEndPosition (int charIdx ) {
45+ TwoLevelNavigator navigator = textLayout ().getTwoLevelNavigator ();
46+ int currentLineIndex = navigator .offsetToPosition (charIdx , Forward ).getMajor ();
47+ int minor = (currentLineIndex == getLineCount () - 1 ) ? 0 : -1 ;
48+ return navigator .position (currentLineIndex + 1 , minor ).toOffset ();
49+ }
50+
51+ int getLineOfCharacter (int charIdx ) {
52+ TwoLevelNavigator navigator = textLayout ().getTwoLevelNavigator ();
53+ return navigator .offsetToPosition (charIdx , Forward ).getMajor ();
54+ }
55+
56+ PathElement [] getCaretShape (int charIdx , boolean isLeading ) {
57+ return caretShape (charIdx , isLeading );
58+ }
59+
60+ PathElement [] getRangeShape (IndexRange range ) {
61+ return getRangeShape (range .getStart (), range .getEnd ());
62+ }
63+
64+ PathElement [] getRangeShape (int from , int to ) {
65+ return rangeShape (from , to );
66+ }
67+
68+ PathElement [] getUnderlineShape (IndexRange range ) {
69+ return getUnderlineShape (range .getStart (), range .getEnd ());
70+ }
71+
72+ /**
73+ * @param from The index of the first character.
74+ * @param to The index of the last character.
75+ * @return An array with the PathElement objects which define an
76+ * underline from the first to the last character.
77+ */
78+ PathElement [] getUnderlineShape (int from , int to ) {
79+ // get a Path for the text underline
80+ List <PathElement > result = new ArrayList <>();
81+
82+ PathElement [] shape = rangeShape ( from , to );
83+ // The shape is a closed Path for one or more rectangles AROUND the selected text.
84+ // shape: [MoveTo origin, LineTo top R, LineTo bottom R, LineTo bottom L, LineTo origin, *]
85+
86+ // Extract the bottom left and right coordinates for each rectangle to get the underline path.
87+ for ( int ele = 2 ; ele < shape .length ; ele += 5 )
88+ {
89+ LineTo bl = (LineTo ) shape [ele +1 ];
90+ LineTo br = (LineTo ) shape [ele ];
91+ double y = br .getY () - 2.5 ;
92+
93+ result .add ( new MoveTo ( bl .getX (), y ) );
94+ result .add ( new LineTo ( br .getX (), y ) );
95+ }
96+
97+ return result .toArray (new PathElement [0 ]);
98+ }
99+
100+ CharacterHit hitLine (double x , int lineIndex ) {
101+ return hit (x , textLayout ().getLineCenter ( lineIndex ));
102+ }
103+
104+ CharacterHit hit (double x , double y ) {
105+ TextFlowSpan span = textLayout ().getLineSpan ( (float ) y );
106+ Rectangle2D lineBounds = span .getBounds ();
107+
108+ HitInfo hit = hitTest (new Point2D (x , y ));
109+ int charIdx = hit .getCharIndex ();
110+ boolean leading = hit .isLeading ();
111+
112+ if ( ! leading ) {
113+ // If this is a wrapped paragraph and hit character is at end of hit line, make sure that the
114+ // "character hit" stays at the end of the hit line (and not at the beginning of the next line).
115+ leading = (getLineCount () > 1 && charIdx + 1 >= span .getStart () + span .getLength ());
116+ }
117+
118+ if (x < lineBounds .getMinX () || x > lineBounds .getMaxX ()) {
119+ if (leading ) {
120+ return CharacterHit .insertionAt (charIdx );
121+ } else {
122+ return CharacterHit .insertionAt (charIdx + 1 );
123+ }
124+ } else {
125+ if (leading ) {
126+ return CharacterHit .leadingHalfOf (charIdx );
127+ } else {
128+ return CharacterHit .trailingHalfOf (charIdx );
129+ }
130+ }
131+ }
132+
133+ }
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