我试图创建一个自定义的JProgressBar,利用JLayer类,使它可以根据具体情况不同,la this solution。问题是我想把它作为某种JComponent包装起来,因为它使它更易于管理。我会把它作为一个定制的JLayer公开,但是这个类是封闭的,所以没有做任何事情。我试过让它成为一个JComponent,但屏幕上没有任何东西(可能是因为我不知道如何制作一个包含其他组件的自定义JComponent?)。我尝试了一个JFrame,它可以工作,但大小是错误的,可能是因为进度条使用的是我制作的JFrame的布局管理器,而不是包含JFrame的布局管理器。我试过JProgressBar,它绘制,但然后我没有办法返回JLayer并保留正确的层次结构,没有额外的方法调用后,构造函数,这似乎并不优雅。通过JProgressBar与JLayer创建自定义JComponent
这里是我的示例代码,很大程度上依赖于从我挂到上面的问题代码:
public class Test {
public JComponent makeUI() {
final BoundedRangeModel model = new DefaultBoundedRangeModel();
model.setValue(20);
final JPanel p = new JPanel(new GridLayout(4, 1, 12, 12));
p.setBorder(BorderFactory.createEmptyBorder(24,24,24,24));
// This does not draw
final ColorProgressBar pb4 = new ColorProgressBar(model);
p.add(pb4);
JPanel panel = new JPanel(new BorderLayout());
panel.add(p, BorderLayout.NORTH);
return panel;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
createAndShowGUI();
}
});
}
public static void createAndShowGUI() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch(Exception e) {
e.printStackTrace();
}
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new Test().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
class ColorProgressBar extends JComponent {
private static final long serialVersionUID = -1265489165072929352L;
private BlockedColorLayerUI colorUI = new BlockedColorLayerUI();
private JLayer<JProgressBar> layer;
private JProgressBar bar;
private PropertyChangeSupport supporter = new PropertyChangeSupport(new WeakReference<ColorProgressBar>(this));
public ColorProgressBar(BoundedRangeModel model) {
bar = new JProgressBar(model);
layer = new JLayer<JProgressBar>(bar, colorUI);
this.add(layer);
}
public Color getColor() {
if (colorUI == null)
return null;
return colorUI.color;
}
public void setColor(Color color) {
Color oldColor = colorUI.color;
colorUI.color = color;
supporter.firePropertyChange("color", oldColor, color);
}
@Override
public void paintComponents(Graphics g) {
layer.paintComponents(g);
}
class BlockedColorLayerUI extends LayerUI<JProgressBar> {
public Color color = null;
private BufferedImage bi;
private int prevw = -1;
private int prevh = -1;
@Override public void paint(Graphics g, JComponent c) {
if(color != null) {
JLayer<?> jlayer = (JLayer<?>)c;
JProgressBar progress = (JProgressBar)jlayer.getView();
int w = progress.getSize().width;
int h = progress.getSize().height;
if(bi==null || w!=prevw || h!=prevh) {
bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
}
prevw = w;
prevh = h;
Graphics2D g2 = bi.createGraphics();
super.paint(g2, c);
g2.dispose();
Image image = c.createImage(
new FilteredImageSource(bi.getSource(),
new ColorFilter(color)));
g.drawImage(image, 0, 0, c);
} else {
super.paint(g, c);
}
}
}
class ColorFilter extends RGBImageFilter {
Color color;
public ColorFilter(Color color) {
this.color = color;
}
@Override public int filterRGB(int x, int y, int argb) {
int r = (int)((argb >> 16) & 0xff);
int g = (int)((argb >> 8) & 0xff);
int b = (int)((argb ) & 0xff);
return (argb & color.getRGB()) | (g<<16) | (r<<8) | (b);
}
}
}
任何人都知道我要去哪里错了吗?谢谢!
编辑:我已经微调了这个例子,并修改它以更好地表达我的问题。对困惑感到抱歉。
为了更好地帮助越早,张贴[SSCCE(http://sscce.org/)。 –
我不完全确定如何缩短它的行为并使其可诊断。如果您有任何建议,请随时分享;否则它肯定是自包含和可编译的。 – Jesse
*“我不完全确定如何缩短它的长度”*对于SSCCE而言,比'short'更多。回去再读一遍。此外,WTF会'UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());'与这个问题有关?'?你应该尝试去除它。 –