Jslider反映在面板中

Question

我不知道为什么，尽管我正在尝试制作颜色选择器并且出于某种原因滑块会反映在面板中，但如果我使用其中一个滑块并调整框架大小，它就会消失。

这是我看到的：

我尝试更改不同组件的呈现方式，我尝试更改更改侦听器，我也尝试更改面板，但没有任何更改。

我用过repaint，也尽量不用repaint。

这是我的代码：

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.GridBagLayout;
import javax.swing.JSlider;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.awt.Color;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JLabel;
import java.awt.FlowLayout;
import javax.swing.BoxLayout;
import net.miginfocom.swing.MigLayout;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

public class ThemeBuilder extends JFrame {

    private JPanel contentPane;
    private JPanel colorShow;
    private JPanel pnlButtons;
    private JPanel pnlSldG;
    private JPanel pnlSldB;
    private JPanel pnlSldAlpha;
    private JPanel pnlSldR;
    private JButton btnBackground;
    private JButton btnText;
    private JButton btnPanels;
    private JButton btnButtonsText;
    private JButton btnSideList;
    private JButton btnButtonLabels;
    private JButton btnButtonContours;
    private JButton btnSideListForeground;
    private JButton btnForeground;
    private JLabel label;
    private JSlider sldG;
    private JSlider sldB;
    private JSlider sldAlpha;
    private JSlider sldR;
    private JMenuBar menuBar;
    private JMenuItem mntmFile;



    /**
     * Create the frame.
     */
    public ThemeBuilder() {
        makeSliders();
        makeBtns();
        makePnls();
        makeFrame();
    }

    private void makeFrame(){
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 431, 476);
        menuBar = new JMenuBar();
        setJMenuBar(menuBar);
        mntmFile = new JMenuItem("File");
        menuBar.add(mntmFile);
    }


    private void makePnls(){

        pnlButtons = new JPanel();
        GridBagConstraints gbc_pnlButtons = new GridBagConstraints();
        gbc_pnlButtons.gridwidth = 2;
        gbc_pnlButtons.anchor = GridBagConstraints.NORTH;
        gbc_pnlButtons.gridx = 0;
        gbc_pnlButtons.gridy = 5;
        pnlButtons.setLayout(new MigLayout("", "[97px][71px][95px][113px][79px][89px][111px]", "[23px][][][][][][][][]"));

        pnlSldB = new JPanel();
        GridBagConstraints gbc_pnlSldB = new GridBagConstraints();
        gbc_pnlSldB.anchor = GridBagConstraints.NORTH;
        gbc_pnlSldB.insets = new Insets(0, 0, 5, 5);
        gbc_pnlSldB.fill = GridBagConstraints.HORIZONTAL;
        gbc_pnlSldB.gridx = 0;
        gbc_pnlSldB.gridy = 3;

        colorShow = new JPanel();
        colorShow.setBackground(Color.GRAY);
        GridBagConstraints gbc_colorShow = new GridBagConstraints();
        gbc_colorShow.gridheight = 3;
        gbc_colorShow.insets = new Insets(0, 0, 5, 0);
        gbc_colorShow.fill = GridBagConstraints.BOTH;
        gbc_colorShow.gridx = 1;
        gbc_colorShow.gridy = 1;
        colorShow.setOpaque(true);
        colorShow.setDoubleBuffered(true);


        pnlSldG = new JPanel();
        GridBagConstraints gbc_pnlSldG = new GridBagConstraints();
        gbc_pnlSldG.gridheight = 2;
        gbc_pnlSldG.insets = new Insets(0, 0, 5, 5);
        gbc_pnlSldG.fill = GridBagConstraints.BOTH;
        gbc_pnlSldG.gridx = 0;
        gbc_pnlSldG.gridy = 1;


        pnlSldR = new JPanel();
        GridBagConstraints gbc_pnlSldR = new GridBagConstraints();
        gbc_pnlSldR.insets = new Insets(0, 0, 5, 5);
        gbc_pnlSldR.fill = GridBagConstraints.BOTH;
        gbc_pnlSldR.gridx = 0;
        gbc_pnlSldR.gridy = 0;


        pnlSldAlpha = new JPanel();
        GridBagConstraints gbc_pnlSldAlpha = new GridBagConstraints();
        gbc_pnlSldAlpha.insets = new Insets(0, 0, 5, 5);
        gbc_pnlSldAlpha.fill = GridBagConstraints.BOTH;
        gbc_pnlSldAlpha.gridx = 0;
        gbc_pnlSldAlpha.gridy = 4;

        pnlSldR.add(sldR);
        pnlSldG.add(sldG);
        pnlSldB.add(sldB);
        pnlSldAlpha.add(sldAlpha);
        pnlButtons.add(btnButtonLabels, "cell 0 0,alignx left,aligny center");
        pnlButtons.add(btnButtonContours, "cell 1 0,alignx left,aligny center");
        pnlButtons.add(label, "cell 4 0,alignx left,aligny center");
        pnlButtons.add(btnButtonsText, "cell 0 1,alignx left,aligny center");
        pnlButtons.add(btnText, "cell 0 3,alignx left,aligny center");
        pnlButtons.add(btnPanels, "cell 1 3,alignx left,aligny center");
        pnlButtons.add(btnSideListForeground, "cell 0 5");
        pnlButtons.add(btnSideList, "cell 1 5,alignx left,aligny center");
        pnlButtons.add(btnBackground, "cell 0 8,alignx left,aligny center");
        pnlButtons.add(btnForeground, "cell 1 8");

        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        GridBagLayout gbl_contentPane = new GridBagLayout();
        gbl_contentPane.columnWidths = new int[]{0, 0, 0};
        gbl_contentPane.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0};
        gbl_contentPane.columnWeights = new double[]{1.0, 1.0, Double.MIN_VALUE};
        gbl_contentPane.rowWeights = new double[]{1.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
        contentPane.setLayout(gbl_contentPane);

        contentPane.add(pnlButtons, gbc_pnlButtons);
        contentPane.add(pnlSldB, gbc_pnlSldB);
        contentPane.add(colorShow, gbc_colorShow);
        contentPane.add(pnlSldG, gbc_pnlSldG);
        contentPane.add(pnlSldR, gbc_pnlSldR);
        contentPane.add(pnlSldAlpha, gbc_pnlSldAlpha);

        pnlButtons.repaint();
        pnlSldAlpha.repaint();
        pnlSldR.repaint();
        pnlSldB.repaint();
        pnlSldG.repaint();
        btnPanels.repaint();
        contentPane.repaint();

    }

    private void makeSliders(){
        sldR = new JSlider();
        sldR.setMaximum(240);
        sldR.setMajorTickSpacing(50);
        sldR.setSnapToTicks(true);
        sldR.setPaintTicks(true);
        sldR.setPaintLabels(true);
        sldR.setValue(104);

        sldG = new JSlider();
        sldG.setMaximum(240);
        sldG.setSnapToTicks(true);
        sldG.setPaintTicks(true);
        sldG.setPaintLabels(true);
        sldG.setMajorTickSpacing(50);
        sldG.setValue(104);

        sldB = new JSlider();
        sldB.setMaximum(240);
        sldB.setSnapToTicks(true);
        sldB.setPaintTicks(true);
        sldB.setPaintLabels(true);
        sldB.setMajorTickSpacing(50);
        sldB.setValue(104);

        sldAlpha = new JSlider();
        sldAlpha.setMaximum(240);
        sldAlpha.setSnapToTicks(true);
        sldAlpha.setPaintTicks(true);
        sldAlpha.setPaintLabels(true);
        sldAlpha.setMajorTickSpacing(50);
        sldAlpha.setValue(240);
    }


    private void makeBtns(){
        btnButtonLabels = new JButton("Button Labels");
        btnButtonContours = new JButton("Button Contours");
        label = new JLabel("");
        btnButtonsText = new JButton("Buttons Text");
        btnText = new JButton("Top Menu Labels");
        btnPanels = new JButton("Top Menu");
        btnSideListForeground = new JButton("Side List Foreground");
        btnSideList = new JButton("Side List Background");
        btnBackground = new JButton("Background");
        btnForeground = new JButton("Foreground");
    }


    public JPanel getContentPane() {
        return contentPane;
    }

    protected JPanel getColorShow() {
        return colorShow;
    }

    protected JPanel getPnlButtons() {
        return pnlButtons;
    }

    protected JPanel getPnlSldG() {
        return pnlSldG;
    }

    protected JPanel getPnlSldB() {
        return pnlSldB;
    }

    protected JPanel getPnlSldAlpha() {
        return pnlSldAlpha;
    }

    protected JPanel getPnlSldR() {
        return pnlSldR;
    }

    protected JButton getBtnBackground() {
        return btnBackground;
    }

    protected JButton getBtnText() {
        return btnText;
    }

    protected JButton getBtnPanels() {
        return btnPanels;
    }

    protected JButton getBtnButtonsText() {
        return btnButtonsText;
    }

    protected JButton getBtnSideList() {
        return btnSideList;
    }

    protected JButton getBtnButtonLabels() {
        return btnButtonLabels;
    }

    protected JButton getBtnButtonContours() {
        return btnButtonContours;
    }

    protected JButton getBtnSideListForeground() {
        return btnSideListForeground;
    }

    protected JButton getBtnForeground() {
        return btnForeground;
    }

    protected JLabel getLabel() {
        return label;
    }

    protected JSlider getSldG() {
        return sldG;
    }

    protected JSlider getSldB() {
        return sldB;
    }

    protected JSlider getSldAlpha() {
        return sldAlpha;
    }

    protected JSlider getSldR() {
        return sldR;
    }
}

这是包装器（只是为了便于阅读）：

import java.awt.Color;

import javax.swing.JComponent;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class ThemeWrapper {

    private Theme theme;
    private ThemeBuilder builder;
    private int r, g, b, a;

    public ThemeWrapper(Theme theme) {
        this.builder = new ThemeBuilder();
        this.builder.setVisible(true);
        this.theme = new Theme();
        this.r = builder.getSldR().getValue();
        this.g = builder.getSldG().getValue();
        this.b = builder.getSldB().getValue();
        this.a = builder.getSldAlpha().getValue();
        initializeBehaviors();
    }

    public void initializeBehaviors(){

        builder.getSldR().addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged(ChangeEvent e) {

                if(e.getSource() == builder.getSldR()){
                    changeColor();
                }
            }
        });

        builder.getSldG().addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged(ChangeEvent e) {

                if(e.getSource() == builder.getSldG()){
                    changeColor();
                }
            }
        });

        builder.getSldB().addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged(ChangeEvent e) {

                if(e.getSource() == builder.getSldB()){
                    changeColor();
                }
            }
        });

        builder.getSldAlpha().addChangeListener(new ChangeListener() {

            @Override
            public void stateChanged(ChangeEvent e) {

                if(e.getSource() == builder.getSldAlpha()){
                    changeColor();
                }
            }
        });
    }

    private void changeColor(){
        r = builder.getSldR().getValue();
        g = builder.getSldG().getValue();
        b = builder.getSldB().getValue();
        a = builder.getSldAlpha().getValue();
        applyColor(builder.getColorShow());
    }

    private void applyColor(JComponent component){
        component.setBackground(new Color(r, g, b, a));
        component.repaint();
    }


    public void disposeFrames(){
        builder.setVisible(false);
        builder.dispose();
    }


    public Theme getTheme() {
        return theme;
    }
}

Answer 1

component.setBackground(new Color(r, g, b, a));

Swing 无法正确绘制具有透明背景的组件。

您需要确保已绘制背景以消除绘制瑕疵。查看 Backgrounds With Transparency 了解更多信息和解决方案。

还有：

Swing组件默认双缓冲所以不需要使用setDoubleBuffered(true).
所有组件都在框架可见时绘制，因此无需在单个组件上调用 repaint()。

Answer 2

不，我只是想通了，那是因为你必须重新绘制框架！

private void changeColor(){
    r = builder.getSldR().getValue();
    g = builder.getSldG().getValue();
    b = builder.getSldB().getValue();
    a = builder.getSldAlpha().getValue();
    applyColor(builder.getColorShow());
    builder.repaint();
}

Jslider反映在面板中

Jslider reflected in pannel

java

swing

jcomponent

jpanel

jslider