我在我的应用程序中使用 JCombobox 和 Nimbus LaF。 我已经针对不同的状态覆盖了 Combobox 的 Backgroundpainter 和 ArrowButton 的 Foregroundpainter 。 油漆工们工作得很好。但是当我增加字体大小时，Combobox 的箭头按钮会拉伸(stretch)，看起来不太好。
如何使其不可拉伸(stretch)？
我使用了 Nimbus LaF 本身的画家，我必须提供自己的 PaintContext。
这是显示问题的代码。
public class ComboTest {
public ComboTest(){
String labels[] = { "A", "B", "C", "D" };
JFrame frame = new JFrame("ComboBox Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JComboBox comboBox = new JComboBox(labels);
frame.add(comboBox, BorderLayout.NORTH);
frame.setSize(300, 100);
frame.setVisible(true);
}
public static void main(String[] args)
{
try {
UIManager.setLookAndFeel(NimbusLookAndFeel.class.getName());
}
catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
UIManager.getLookAndFeelDefaults().put("defaultFont", new Font("Segoe UI", Font.PLAIN,16));
// if i put the different font size than it is strecthing, with the size 12 it looks good.
//UIManager.getLookAndFeelDefaults().put("defaultFont", new Font("SegoeUI",Font.PLAIN,12));
UIManager.getLookAndFeelDefaults().put("ComboBox:\"ComboBox.arrowButton"[Pressed].foregroundPainter", new ComboArrowPainter(1));
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new ComboTest();
}
});
}
}
这是 ArrowPainter 的类(class)，它是我从 Nimbus 获取的
public class ComboArrowPainter extends AbstractRegionPainter {
static final int FOREGROUND_PRESSED = 1;
private int state; //refers to one of the static final ints above
private PaintContext ctx;
//the following 4 variables are reused during the painting code of the layers
private Path2D path = new Path2D.Float();
private Color color31 = decodeColor("textForeground", 0.0f, -0.6357143f, 0.45098037f, 0);
public ComboArrowPainter(int state) {
super();
this.state = state;
this.ctx = new PaintContext(new Insets(6,10,6,10), new Dimension(19,19), false);;
}
private Object[] componentColors;
@Override
protected void doPaint(Graphics2D g, JComponent c, int width, int height, Object[] extendedCacheKeys) {
//populate componentColors array with colors calculated in getExtendedCacheKeys call
componentColors = extendedCacheKeys;
paintForegroundPressed(g);
}
@Override
protected final PaintContext getPaintContext() {
return ctx;
}
private void paintForegroundPressed(Graphics2D g) {
path = decodePath8();
g.setPaint(color31);
g.fill(path);
}
private Path2D decodePath8() {
path.reset();
path.moveTo(decodeX(1.0242647f), decodeY(1.3526785f));
path.lineTo(decodeX(2.0f), decodeY(0.8333333f));
path.lineTo(decodeX(2.0f), decodeY(1.8571429f));
path.lineTo(decodeX(1.0242647f), decodeY(1.3526785f));
path.closePath();
return path;
}
}
最佳答案
幸运的是，我已经找到了解决办法。我已经计算了相对于字体大小的组件大小。我们已使用该值作为 Paintcontext。这是更新后的 Painter 类的构造函数，其余的将是相同的。
public ComboArrowPainter(int state, int FontSize) {
super();
this.state = state;
double value = FontSize*1.31031746;
int topBottomInsssetValue =(int) Math.ceil((value)/2);
this.ctx = new PaintContext(new Insets(6,topBottomInsssetValue,6,topBottomInsssetValue), new Dimension(19,19), false);
}
关于java - 组合框箭头按钮根据 nimbus LaF 中的字体大小进行拉伸(stretch)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25743102/