<Swing Dev> [9] Review request for 8081411 Add an API for painting an icon with a SynthContext

[Alexander Zvegintsev]

The fix looks good to me.

Thanks,

Alexander.

On 08/06/2015 11:29 AM, Alexander Scherbatiy wrote:
>
> Hello,
>
> Could you review the fix:
>   bug: https://bugs.openjdk.java.net/browse/JDK-8081411
>   webrev: http://cr.openjdk.java.net/~alexsch/8081411/webrev.00
>
>  The following use case were considered:
>
> 1. An icon is taken from UIManager.getIcon(iconKey) and should be 
> painted.
>    Icon icon = UIManager.getIcon(iconKey);
>
>    icon.paint(graphics, x, y) may not work for icons that are used by 
> Synth L&F because the paint method with null synth context may just do 
> nothing.
>
> 2. One icons is created based on existed icon.
>
>   Foe example, creating a centered icon:
>   ----------------------------
>     Icon centeredIcon = new SynthIcon() {
>         private final SynthIcon synthIcon = (SynthIcon)icon;
>         public void paintIcon(SynthContext sc, Graphics grphcs, int x, 
> int y, int w, int h) {
>             try {
>                 int dw = SynthIcon.getIconWidth(synthIcon, sc);
>                 int dh = SynthIcon.getIconHeight(synthIcon, sc);
>                 int dx = width - dw;
>                 int dy = height - dh;
>                 SynthIcon.paintIcon(synthIcon, sc, grphcs, x + dx/2, y 
> + dy/2, dw + 2, dh + 2);
>             } catch (Throwable t) {
>                 try { synthIcon.paintIcon(sc, grphcs, x, y, w, h); } 
> catch (Throwable th) {}
>             }
>         }
>         public int getIconWidth(SynthContext sc)  { return width; }
>         public int getIconHeight(SynthContext sc) { return height; }
>     };
>   ----------------------------
>
>   Overriding just paintIcon(Component c, Graphics g, int x, int y) 
> leads to the same issue. The icon may not be drawn in this case.
>
> 3. Replace an icon in UIManager to a custom icon which can use a synth 
> context for painting:
>    UIManager.putIcon(iconKey, new CustomIcon())
>
> The case 1 requires that only the following static methods were public:
>    SynthIcon.paintIcon(context, graphics, x, y, w, h)
>    SynthIcon.getIconwidth(context)
>    SynthIcon.getIconHeight(context)
>
> The cases 2 and 3 need to work with SyntIcon class.
>
> The proposed fix moves the paintIcon/getIconwidth/getIconHeight 
> methods to the public SynthGraphicsUtils class
> and make the SynthIcon class public by moving it to the 
> javax.swing.plaf.synth package.
>
> Thanks,
> Alexandr.
>