Java paintComponent()正在其他组件上绘制
我正在使用一个自定义类,基于中的代码,绘制一个形状像语音泡泡的背景。每当我调整应用程序窗口的大小,使一个组件在顶部或底部突出时,所述组件的轮廓就会在其他组件顶部的Java paintComponent()正在其他组件上绘制,java,swing,border,jscrollpane,Java,Swing,Border,Jscrollpane,我正在使用一个自定义类,基于中的代码,绘制一个形状像语音泡泡的背景。每当我调整应用程序窗口的大小,使一个组件在顶部或底部突出时,所述组件的轮廓就会在其他组件顶部的JScrollPane外部绘制;在这种情况下,JPanel 在左侧图像中,由于组件仍然可见,因此绘制了JScrollPane底部组件的边框;而在右侧图像中,所提到的组件不再可见,所有内容看起来都符合预期 我相信这与我使用JScrollPane来包含组件,从而允许组件在JPanel下滑动有关。我如何防止这种情况 主要内容: 您的基本问题
JScrollPane
外部绘制;在这种情况下,JPanel
在左侧图像中,由于组件仍然可见,因此绘制了JScrollPane
底部组件的边框;而在右侧图像中,所提到的组件不再可见,所有内容看起来都符合预期
我相信这与我使用JScrollPane
来包含组件,从而允许组件在JPanel
下滑动有关。我如何防止这种情况
主要内容:
您的基本问题是,您正在将剪切区域(在绘制组件之前设置)更改为其他允许您绘制超出组件边界的区域 正如和所讨论的,边框并不意味着要填充,也不会影响
paintComponent
如果查看,您将看到在paintBorder
之前调用了paintComponent
javax.swing.JComponent扩展了这个类,并进一步考虑了
将方法绘制为三个单独的方法,这些方法在
顺序如下:
- 受保护组件(图形g)
- 受保护的空白油漆边框(图形g)
- 受保护的子对象(图形g)
导入java.awt.BorderLayout;
导入java.awt.Color;
导入java.awt.EventQueue;
导入java.awt.FlowLayout;
导入java.awt.Graphics;
导入java.awt.Graphics2D;
导入java.awt.GridBagLayout;
导入java.awt.Insets;
导入java.awt.Polygon;
导入javax.swing.BoxLayout;
导入javax.swing.JFrame;
导入javax.swing.JLabel;
导入javax.swing.JPanel;
导入javax.swing.JScrollPane;
导入javax.swing.UIManager;
导入javax.swing.UnsupportedLookAndFeelException;
导入javax.swing.border.EmptyBorder;
公开课作弊{
公共静态void main(字符串[]args){
新边界欺骗();
}
公共边界欺诈(){
invokeLater(新的Runnable(){
@凌驾
公开募捐{
试一试{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}catch(ClassNotFoundException |实例化Exception | IllegalacessException |不支持ookandfeelException ex){
例如printStackTrace();
}
JPanel panel=newjpanel(),panelbar=newjpanel();
panel.setLayout(新的BoxLayout(panel,BoxLayout.Y_轴));
setLayout(新的FlowLayout());
JScrollPane scroll=新建JScrollPane(面板,
JScrollPane.VERTICAL\u滚动条\u始终,
JScrollPane.HORIZONTAL\u SCROLLBAR\u NEVER);
对于(int i=0;i<6;i++){
泡泡烷bp=新泡泡烷();
挫折背景(颜色:橙色);
JLabel标签=新的JLabel(“JLabel”);
添加(标签);
面板。添加(bp);
}
panelbar.add(新JLabel(“JPanel”);
JFrame=新JFrame(“测试”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(滚动);
框架。添加(面板栏,边框布局。南部);
frame.pack();
frame.setLocationRelativeTo(空);
frame.setVisible(true);
}
});
}
公共类泡泡烷扩展JPanel{
公共泡泡烷(){
setLayout(新的GridBagLayout());
新订单(新订单(10,20,10,30);;
设置不透明(假);
}
@凌驾
受保护组件(图形g){
超级组件(g);
Graphics2D g2d=(Graphics2D)g.create();
Insets Insets=getInsets();
int x=0;
int y=0;
int width=getWidth();
int height=getHeight();
多边形气泡=新多边形();
泡泡点(x,y);
气泡添加点(x+宽度-插图右侧+10,y);
气泡添加点(x+宽度-插图右侧+10,y+高度/3);
气泡添加点(x+宽度,y+高度/2);
气泡添加点(x+宽度-插图右侧+10,y+高度*2/3);
气泡添加点(x+宽度-插图右侧+10,y+高度);
气泡添加点(x,y+高度);
setColor(getBackground());
g2d.填充(气泡);
g2d.setColor(Color.BLACK);
g2d.绘制(气泡);
g2d.dispose();
}
}
}
好吧,你说,“但他们之间没有差距”。好的,所以使用一个
复合边框
或一个允许您指定组件之间垂直或水平间距的布局…剪裁代码有两个问题:
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
super.paintBorder(c, g, x, y, width, height);
Polygon bubble = new Polygon();
bubble.addPoint(x + 10, y + 5);
bubble.addPoint(x + width - 10, y + 5);
bubble.addPoint(x + width - 10, y + height / 3);
bubble.addPoint(x + width, y + height / 2);
bubble.addPoint(x + width - 10, y + height * 2 / 3);
bubble.addPoint(x + width - 10, y - 5 + height);
bubble.addPoint(x + 10, y - 5 + height);
Graphics2D g2d = (Graphics2D) g;
//Area rect = new Area(new Rectangle(x, y, width, height));
Shape clip = g2d.getClip();
Area rect = new Area(clip);
rect.subtract(new Area(bubble));
g2d.setClip(rect);
g2d.setColor(c.getParent().getBackground());
g2d.fillRect(0, 0, width, height);
//g2d.setClip(null);
g2d.setClip(clip);
g2d.setColor(Color.BLACK);
g2d.draw(bubble);
}
这g2d.setClip(rect)
将给您带来问题,因为您已经更改了原始的图形
上下文剪辑,现在允许您在不应该绘制的地方绘制,这就是我不使用剪辑
的原因。相反,制作一个与您试图生成的形状相匹配的形状
,并绘制
/填充
以供参考:边框
s ar
public class CustomBorder extends AbstractBorder {
private static final long serialVersionUID = 1L;
Insets i;
CustomBorder() {
i = new Insets(10, 20, 10, 20);
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
super.paintBorder(c, g, x, y, width, height);
Polygon bubble = new Polygon();
bubble.addPoint(x + 10, y + 5);
bubble.addPoint(x + width - 10, y + 5);
bubble.addPoint(x + width - 10, y + height / 3);
bubble.addPoint(x + width, y + height / 2);
bubble.addPoint(x + width - 10, y + height * 2 / 3);
bubble.addPoint(x + width - 10, y - 5 + height);
bubble.addPoint(x + 10, y - 5 + height);
Graphics2D g2d = (Graphics2D) g;
Area rect = new Area(new Rectangle(x, y, width, height));
rect.subtract(new Area(bubble));
g2d.setClip(rect);
g2d.setColor(c.getParent().getBackground());
g2d.fillRect(0, 0, width, height);
g2d.setClip(null);
g2d.setColor(Color.BLACK);
g2d.draw(bubble);
}
@Override
public Insets getBorderInsets(Component c) {
return i;
}
@Override
public Insets getBorderInsets(Component c, Insets insets) {
return i;
}
}
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Polygon;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class BorderCheat {
public static void main(String[] args) {
new BorderCheat();
}
public BorderCheat() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JPanel panel = new JPanel(), panelbar = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
panelbar.setLayout(new FlowLayout());
JScrollPane scroll = new JScrollPane(panel,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
for (int i = 0; i < 6; i++) {
BubblePane bp = new BubblePane();
bp.setBackground(Color.ORANGE);
JLabel label = new JLabel("JLabel");
bp.add(label);
panel.add(bp);
}
panelbar.add(new JLabel("JPanel"));
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(scroll);
frame.add(panelbar, BorderLayout.SOUTH);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class BubblePane extends JPanel {
public BubblePane() {
setLayout(new GridBagLayout());
setBorder(new EmptyBorder(10, 20, 10, 30));
setOpaque(false);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
Insets insets = getInsets();
int x = 0;
int y = 0;
int width = getWidth();
int height = getHeight();
Polygon bubble = new Polygon();
bubble.addPoint(x, y);
bubble.addPoint(x + width - insets.right + 10, y);
bubble.addPoint(x + width - insets.right + 10, y + height / 3);
bubble.addPoint(x + width, y + height / 2);
bubble.addPoint(x + width - insets.right + 10, y + height * 2 / 3);
bubble.addPoint(x + width - insets.right + 10, y + height);
bubble.addPoint(x, y + height);
g2d.setColor(getBackground());
g2d.fill(bubble);
g2d.setColor(Color.BLACK);
g2d.draw(bubble);
g2d.dispose();
}
}
}
@Override
public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
super.paintBorder(c, g, x, y, width, height);
Polygon bubble = new Polygon();
bubble.addPoint(x + 10, y + 5);
bubble.addPoint(x + width - 10, y + 5);
bubble.addPoint(x + width - 10, y + height / 3);
bubble.addPoint(x + width, y + height / 2);
bubble.addPoint(x + width - 10, y + height * 2 / 3);
bubble.addPoint(x + width - 10, y - 5 + height);
bubble.addPoint(x + 10, y - 5 + height);
Graphics2D g2d = (Graphics2D) g;
//Area rect = new Area(new Rectangle(x, y, width, height));
Shape clip = g2d.getClip();
Area rect = new Area(clip);
rect.subtract(new Area(bubble));
g2d.setClip(rect);
g2d.setColor(c.getParent().getBackground());
g2d.fillRect(0, 0, width, height);
//g2d.setClip(null);
g2d.setClip(clip);
g2d.setColor(Color.BLACK);
g2d.draw(bubble);
}