<Swing Dev> [9] Review request for 8163124 Add floating point API support to javax.swing.text.Caret

[Alexandr Scherbatiy]

Hello,

Could you review the fix:
   bug: https://bugs.openjdk.java.net/browse/JDK-8163124
   webrev: http://cr.openjdk.java.net/~alexsch/8163124/webrev.00

   The text position can have floating point value on HiDPI display. The 
Caret interface should be updated to allow use floating point positions.

   The fix adds the following public API with floating point positions:
   javax.swing.text.Caret.getMagicCaretPosition2D()
   javax.swing.text.Caret.setMagicCaretPosition2D(Point2D p)
   javax.swing.text.JTextComponent.modelToView2D(int pos)
   javax.swing.text.JTextComponent.viewToModel2D(Point2D pt)
   javax.swing.text.ParagraphView.getClosestPositionTo(int pos, 
Position.Bias b, Shape a, int direction, Position.Bias[], int rowIndex, 
float x)


   The fix replaces 
Caret.getMagicCaretPosition()/setMagicCaretPosition(Point p) to 
Caret.getMagicCaretPosition2D()/setMagicCaretPosition2D(Point2D p) in 
all places
   except DefaultCaret because DefaultCaret extends Rectangle so its 
coordinates always have int values.
   I have filled a separated enhancement for this JDK-8163174 Add 
DefaultCaret2D which supports floating point API

   To make a custom caret use floating point API it is also necessary 
that PlainView.modelToView() returns a rectangle with floating point 
values. It can be done after the fix
     JDK-8156217 Selected text is shifted on HiDPI display
   which implements Utilities.getTabbedTextWidth(Segment s, FontMetrics 
metrics, float x, TabExpander e, int startOffset) method.
   I have filled a separated issue on it:
     JDK-8163175 PlainView.modelToView() method should return Rectangle2D

  Thanks,
  Alexandr.