com.codename1.ui

Interface Painter

All Known Implementing Classes:

BackgroundPainter, GlassTutorial, PainterChain, Timeline

public interface Painter

Painter can be used to draw on components backgrounds. The use of this interface allows reuse of a background Painter for various components.
A simple example of a background painter is shown here to draw a circle background:

 
Painter p = new Painter(cmp) {
    public void paint(Graphics g, Rectangle rect) {
        boolean antiAliased = g.isAntiAliased();
        g.setAntiAliased(true);
        int r = Math.min(rect.getWidth(), rect.getHeight())/2;
        int x = rect.getX() + rect.getWidth()/2 - r;
        int y = rect.getY() + rect.getHeight()/2 - r;
        switch (style) {
            case CircleButtonStrokedDark:
            case CircleButtonStrokedLight: {
                if (cmp.getStyle().getBgTransparency() != 0) {
                    int alpha = cmp.getStyle().getBgTransparency();
                    if (alpha <0) {
                        alpha = 0xff;
                    }
                    g.setColor(cmp.getStyle().getBgColor());
                    g.setAlpha(alpha);
                    g.fillArc(x, y, 2*r-1, 2*r-1, 0, 360);
                    g.setAlpha(0xff);
                }
                g.setColor(cmp.getStyle().getFgColor());
                g.drawArc(x, y, 2*r-1, 2*r-1, 0, 360);
                break;
            }
            case CircleButtonFilledDark:
            case CircleButtonFilledLight:
            case CircleButtonTransparentDark:
            case CircleButtonTransparentLight: {
                int alpha = cmp.getStyle().getBgTransparency();
                if (alpha < 0) {
                    alpha = 0xff;
                }
                g.setAlpha(alpha);
                g.setColor(cmp.getStyle().getBgColor());
                g.fillArc(x, y, 2*r, 2*r, 0, 360);
                g.setAlpha(0xff);
                break;
            }
        }

        g.setAntiAliased(antiAliased);
    }
};
cmp.getAllStyles().setBgPainter(p);

Painters can also be used to draw the glasspane which is layered on top of the form. The example shows a glasspane running on top of a field to show a validation hint, notice that for real world usage you should probably look into Validator. Also notice that this example uses the shorter Java 8 lambda syntax to represent the glasspane.

Method Summary

Modifier and Type	Method and Description
void	paint(Graphics g, Rectangle rect) Draws inside the given rectangle clipping area.

Method Detail

paint

void paint(Graphics g,
           Rectangle rect)

Draws inside the given rectangle clipping area.

Parameters:

g - the Graphics object

rect - the given rectangle cliping area