是否可以在JButtons中實現(xiàn)文本自動自動換行？我在運行時創(chuàng)建了幾個動態(tài)按鈕。我想在按鈕上使用自動換行功能，以便可以對按鈕進(jìn)行更好的測試。有可能這樣做嗎？
3 回答
慕的地10843
TA貢獻(xiàn)1785條經(jīng)驗 獲得超8個贊
最簡單的方法是修改另一個支持自動換行的Component，以使其充當(dāng)Button。我做了一個簡單的類，它操縱JTextArea充當(dāng)Button。
public class MultiLineButton extends JTextArea implements MouseListener {
/**
*
*/
private static final long serialVersionUID = 1L;
private Color defaultColor;
private Color highlight, lightHighlight;
private BtnState state;
private List<ActionListener> actionListeners;
public MultiLineButton(String text, Color defaultColor) {
this.setEditable(false);
this.setText(text);
this.setLineWrap(true);
this.setWrapStyleWord(true);
this.addMouseListener(this);
this.setBorder(new EmptyBorder(5, 10, 5, 10));
state = BtnState.NORMAL;
this.defaultColor = defaultColor;
this.setBackground(defaultColor);
highlight = new Color(122, 138, 153);
lightHighlight = new Color(184, 207, 229);
// clickedColor = new Color(r, g, b);/
actionListeners = new ArrayList<>();
}
@Override
public Color getSelectionColor() {
return getBackground();
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
setBackground(lightHighlight);
state = BtnState.CLICKED;
repaint();
}
@Override
public void mouseReleased(MouseEvent e) {
for (ActionListener l : actionListeners) {
l.actionPerformed(new ActionEvent(this, ActionEvent.ACTION_PERFORMED, this.getText()));
}
setBackground(defaultColor);
state = BtnState.NORMAL;
repaint();
}
@Override
public void mouseEntered(MouseEvent e) {
state = BtnState.HOVERED;
repaint();
}
@Override
public void mouseExited(MouseEvent e) {
setBackground(defaultColor);
state = BtnState.NORMAL;
repaint();
}
@Override
public void paintBorder(Graphics g) {
super.paintBorder(g);
Graphics g2 = g.create();
g2.setColor(highlight);
switch (state) {
case NORMAL:
g2.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
break;
case HOVERED:
g2.drawRect(1, 1, getWidth() - 3, getHeight() - 3);
g2.setColor(lightHighlight);
g2.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2.drawRect(2, 2, getWidth() - 5, getHeight() - 5);
break;
case CLICKED:
Border b = new BevelBorder(BevelBorder.LOWERED);
b.paintBorder(this, g2, 0, 0, getWidth(), getHeight());
break;
}
g2.dispose();
}
public void addActionListener(ActionListener l) {
actionListeners.add(l);
}
public List<ActionListener> getActionListeners() {
return actionListeners;
}
}
BtnState只是一個具有常量NORMAL，HOVERED，CLICKED的枚舉
大多數(shù)代碼僅用于使JTextArea看起來像JButton，并且效果很好。缺點之一是您無法通過ButtonModels修改它，但是對于大多數(shù)應(yīng)用程序來說，這就足夠了。
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