[英]repaint method not working?
我在按下按钮后无法在面板上重新绘制矩形。 我更改颜色并调用repaint方法,所以我不确定为什么按下按钮后就不重绘。 “画布面板”是带有我要重绘的矩形的面板。“整个面板”是带有应该响应的按钮的面板。
我的代码:
public WholePanel()
{
//white is the default color
currentColor = Color.WHITE;
//default x-y cooridnate, width, and height of a rectangle
currentWidth = currentHeight = 100;
x1 = 100; y1 = 100;
//Creating buttons
fillCheck = new JCheckBox("Filled");
white=new JRadioButton("white");
red=new JRadioButton("red");
//Adds listeners to each button
white.addItemListener(new ColorListener());
red.addItemListener(new ColorListener());
//Adding buttons to buttonGroup so only one can be pressed at a time
group.add(white);
group.add(red);
menuPanel = new JPanel();
menuPanel.add(fillCheck);
menuPanel.add(white);
menuPanel.add(red);
canvas = new CanvasPanel();
JSplitPane sPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, menuPanel, canvas);
setLayout(new BorderLayout());
add(sPane, BorderLayout.CENTER);
}
//insert ColorListener and FillListener classes
public class ColorListener implements ItemListener {
@Override
public void itemStateChanged(ItemEvent e) {
Object source=e.getSource();
if(source==red) {
currentColor=Color.white;
repaint();
}
else if (source==white) {
currentColor=Color.white;
repaint();
}
}
}
//This method is in a seperate CanvasPanel class where pressed keys will be
drawn
//this method draws all characters pressed by a user so far
public void paintComponent(Graphics page)
{
super.paintComponent(page);
//set color, then draw a rectangle
page.setColor(currentColor);
page.drawRect(x1, y1, currentWidth, currentHeight);
}
} // end of Canvas Panel Class
} // end of Whole Pane
我认为缺陷在于您编写的itemStateChanged
方法内:
if (source==red) {
currentColor=Color.white;
...
}
在red
收音机和white
收音机中,您都将颜色设置为white
,这就是矩形颜色不变的原因。
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