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swing-扩展徽章组件JEBadge

前言

因为工作原因,好久没有写swing组件了,最近准备优化一个功能,希望有类似徽章的功能。
徽章在平时的app和h5 页面上经常常见 ,那么在swing中如何实现一个徽章功能呢。

技术分析

为什么不选择绘制方式,却选择JLayeredPane ?

  • 比如扩展border ,自定义paintBorder,会什么样的效果
  • 比如使用JLayer , 自定义LayerUI , 会什么样的效果

使用徽章元素绘制在默认组件上,根据默认组件上基于组件大小的相对位置定位徽章位置。
使用层级面板JLayeredPane 设置默认组件和徽章位于不同层级
实现徽章的小红点、自定义图标、最大值、自定义位置 功能

在这里插入图片描述

依赖组件

MigLayout :可以方便的布局、调整组件大小和位置的框架
FlatLaf : 大部分swing组件都已美化,至少符合个人的审美

MigLayout 和FlatLaf Maven 依赖参考

       <dependency>
            <groupId>com.miglayout</groupId>
            <artifactId>miglayout-swing</artifactId>
            <version>5.2</version>
        </dependency>
       <dependency>
            <groupId>com.formdev</groupId>
            <artifactId>flatlaf</artifactId>
            <version>2.1</version>
        </dependency>

JEBadge 代码

ThemeColor 只是个人喜欢的色值, 使用Color类也可


import cn.hutool.core.util.StrUtil;
import cn.note.swing.core.view.theme.ThemeColor;
import com.formdev.flatlaf.FlatClientProperties;
import net.miginfocom.swing.MigLayout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nonnull;
import javax.swing.*;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
import java.awt.*;

/**
 * 基于MigLayout 布局和Flatlaf UI
 * 扩展组件-徽章
 * <p>
 * 支持dot 小红点
 * 支持数值
 * 支持图标
 * 支持位置 NORTH_WEST SOUTH_WEST NORTH_EAST SOUTH_EAST
 * <p>
 * 使用示例:
 * <pre>
 *         JButton button3 = new JButton("MaxCount");
 *         JEBadge button3Badge = new JEBadge(button3);
 *         button3Badge.setCount(999);
 *         button3Badge.setMaxBadgeCount(99);
 *  </pre>
 *
 * @author jee
 */

public class JEBadge extends JLayeredPane {

    private static Logger log = LoggerFactory.getLogger(JEBadge.class);
    /**
     * 默认前景色
     */
    private final Color DEFAULT_FOREGROUND = Color.white;
    /**
     * 默认背景色
     */
    private final Color DEFAULT_BACKGROUND = ThemeColor.dangerColor;
    /**
     * 默认图标时背景色
     */
    private final Color DEFAULT_ICON_BACKGROUND = ThemeColor.noColor;


    private JComponent wrapComp;
    /**
     * 颜色按钮
     */
    private JButton badgeBtn;

    /**
     * 使用自定义图标
     */
    private Icon badgeIcon;

    /**
     * 是否显示点
     */
    private boolean dot;

    /**
     * 徽章大小
     */
    private int badgeSize;

    /**
     * 徽章计数
     */
    private int badgeCount;

    /**
     * 最大数量
     */
    private int maxBadgeCount;

    /**
     * 默认位置
     */
    private int badgeLocation = SwingConstants.NORTH_EAST;

    public JEBadge(@Nonnull JComponent wrapComp) {
        this(wrapComp, false);
    }

    public JEBadge(@Nonnull JComponent wrapComp, boolean dot) {
        this.wrapComp = wrapComp;
        badgeBtn = new JButton();
        // 设置大小
        if (dot) {
            badgeSize = 8;
        } else {
            badgeSize = UIManager.getFont("Label.font").getSize() * 2;
        }

        this.setLayout(new MigLayout("insets " + badgeSize / 2, "grow", "grow"));
        this.add(wrapComp, "center");
        this.setLayer(wrapComp, JLayeredPane.DEFAULT_LAYER);

        // 圆形徽章
        badgeBtn.putClientProperty(FlatClientProperties.STYLE, "borderWidth:0");
        badgeBtn.setBorderPainted(false);
        badgeBtn.setForeground(DEFAULT_FOREGROUND);
        badgeBtn.setBackground(DEFAULT_BACKGROUND);
        badgeBtn.putClientProperty(FlatClientProperties.BUTTON_TYPE, FlatClientProperties.BUTTON_TYPE_ROUND_RECT);
        this.setLayer(badgeBtn, JLayeredPane.MODAL_LAYER);

        setDot(dot);

        // 监听组件显示后追加徽章
        this.wrapComp.addAncestorListener(new AncestorListener() {
            @Override
            public void ancestorAdded(AncestorEvent event) {
                setBadgeLocation(wrapComp.getWidth(), wrapComp.getHeight());
            }

            @Override
            public void ancestorRemoved(AncestorEvent event) {

            }

            @Override
            public void ancestorMoved(AncestorEvent event) {

            }
        });

    }


    /**
     * 设置徽章的四个角落位置
     *
     * @param location 仅支持SwingConstants.NORTH_WEST SOUTH_WEST NORTH_EAST SOUTH_EAST
     */
    public void setBadgeLocation(int location) {
        if (location == SwingConstants.NORTH_WEST) {
            this.badgeLocation = SwingConstants.NORTH_WEST;
        } else if (location == SwingConstants.SOUTH_WEST) {
            this.badgeLocation = SwingConstants.SOUTH_WEST;
        } else if (location == SwingConstants.NORTH_EAST) {
            this.badgeLocation = SwingConstants.NORTH_EAST;
        } else if (location == SwingConstants.SOUTH_EAST) {
            this.badgeLocation = SwingConstants.SOUTH_EAST;
        } else {
            log.warn("参数不正确,无法更新位置,使用默认位置NORTH_EAST");
            this.badgeLocation = SwingConstants.NORTH_EAST;
        }

    }


    /**
     * 设置徽章位置
     *
     * @param x x轴距离
     * @param y y轴距离
     */
    private void setBadgeLocation(int x, int y) {

        // JLabel 无insets 特殊处理偏移量
        int offsetX = 0;
        if (wrapComp instanceof JLabel) {
            offsetX = badgeSize;
        } else {
            offsetX = badgeSize / 2;

        }
        if (badgeLocation == SwingConstants.NORTH_EAST) {
            x = x + offsetX;
            y = 0;
        } else if (badgeLocation == SwingConstants.SOUTH_EAST) {
            x = x + offsetX;
        } else if (badgeLocation == SwingConstants.NORTH_WEST) {
            x = 0;
            y = 0;
        } else if (badgeLocation == SwingConstants.SOUTH_WEST) {
            x = 0;
        }
        String location = StrUtil.format("pos {} {}", x, y);
        this.remove(badgeBtn);
        this.add(badgeBtn, location);
        this.revalidate();
        this.repaint();
    }

    /**
     * 设置徽章数
     * 对于dot模式不生效
     *
     * @param count 数量
     */
    public void setCount(int count) {
        if (dot) {
            log.warn("已开启dot模式,count设置无效");
            return;
        }

        if (count == 0) {
            this.remove(badgeBtn);
        } else {
            badgeCount = count;
            if (maxBadgeCount > 0 && badgeCount > maxBadgeCount) {
                badgeBtn.setText(maxBadgeCount + "+");
            } else {
                badgeBtn.setText(String.valueOf(count));
            }

        }
    }

    /**
     * 设置最大徽章数量
     *
     * @param maxBadgeCount 徽章数量
     */
    public void setMaxBadgeCount(int maxBadgeCount) {
        this.maxBadgeCount = maxBadgeCount;
        this.setCount(this.badgeCount);
    }

    /**
     * 设置徽章背景颜色
     *
     * @param color 颜色
     */
    public void setBadgeBackgroundColor(Color color) {
        badgeBtn.setBackground(color);
    }

    /**
     * 设置徽章前景颜色
     * 对于dot模式不生效
     *
     * @param color 颜色
     */
    public void setBadgeForegroundColor(Color color) {
        badgeBtn.setForeground(color);
    }

    /**
     * 设置徽章是否按点显示
     *
     * @param dot 是否显示点装
     */
    public void setDot(boolean dot) {
        this.dot = dot;
        if (this.dot) {
            badgeBtn.setMargin(new Insets(2, 2, 2, 2));
            badgeBtn.setText(null);
            badgeBtn.setIcon(null);
        } else {
            badgeBtn.setMargin(new Insets(2, 4, 2, 4));
            badgeBtn.setIcon(null);
            if (badgeCount > 0) {
                this.setCount(badgeCount);
            }
        }
    }


    /**
     * 设置徽章使用自定义图标
     *
     * @param icon 图标
     */
    public void setBadgeIcon(Icon icon) {
        badgeBtn.setIcon(icon);
        badgeBtn.setText(null);
        badgeBtn.setBackground(DEFAULT_ICON_BACKGROUND);
        this.dot = false;
    }

}

JEBadge 测试代码

图片基于此代码

import cn.hutool.core.collection.CollUtil;
import cn.note.swing.core.util.FrameUtil;
import cn.note.swing.core.view.AbstractMigView;
import cn.note.swing.core.view.base.ButtonFactory;
import cn.note.swing.core.view.icon.SvgIconFactory;
import cn.note.swing.core.view.panel.PureColorPanel;
import cn.note.swing.core.view.theme.ThemeColor;
import cn.note.swing.core.view.theme.ThemeFlatLaf;
import com.formdev.flatlaf.extras.FlatSVGIcon;
import net.miginfocom.swing.MigLayout;

import javax.swing.*;
import java.util.List;

/**
 * 徽章测试
 */
public class JEBadgeTest extends AbstractMigView {


    @Override
    protected MigLayout defineMigLayout() {
        return new MigLayout("");
    }

    @Override
    protected void render() {

        // JEBadge Examples
        JTextArea ps = new JTextArea("在没有insets的组件上使用徽章,需要特殊判断比如:JLabel ,虽然大部分组件具有insets,但是特殊组件时,可能JEBadge并不适用!");
        ps.setEditable(false);
        ps.setLineWrap(true);
        view.add(ps, "growx,wrap");
        // 系统组件
        JEBadge button1Badge = new JEBadge(new JButton("Count"));
        button1Badge.setCount(9);

        JEBadge button2Badge = new JEBadge(new JButton("LargeCount"));
        button2Badge.setCount(999);

        JEBadge button3Badge = new JEBadge(ButtonFactory.primaryButton("MaxCount"));
        button3Badge.setCount(999);
        button3Badge.setMaxBadgeCount(99);


        FlatSVGIcon okSvgIcon = SvgIconFactory.icon(SvgIconFactory.Message.ok);
        okSvgIcon.setColorFilter(new FlatSVGIcon.ColorFilter(c -> ThemeColor.greenColor));
        JEBadge button4Badge = new JEBadge(new JButton("IconBadge"));
        button4Badge.setBadgeIcon(okSvgIcon);

        JEBadge button5Badge = new JEBadge(new JButton("Dot"), true);

        addRow("默认测试:", CollUtil.newArrayList(button1Badge, button2Badge, button3Badge, button4Badge, button5Badge));


        // JEBadge with custom components
        PureColorPanel pcp1 = new PureColorPanel(ThemeColor.primaryColor, 100);
        pcp1.setText("NORTH_EAST");
        JEBadge pcp1Badge = new JEBadge(pcp1, true);

        FlatSVGIcon failSvgIcon = SvgIconFactory.icon(SvgIconFactory.Message.error);
        failSvgIcon.setColorFilter(new FlatSVGIcon.ColorFilter(c -> ThemeColor.dangerColor));
        PureColorPanel pcp2 = new PureColorPanel(ThemeColor.greenColor, 120,true);
        pcp2.setText("SOUTH_EAST");
        JEBadge pcp2Badge = new JEBadge(pcp2, true);
        pcp2Badge.setBadgeIcon(failSvgIcon);
        pcp2Badge.setBadgeLocation(SwingConstants.SOUTH_EAST);

        PureColorPanel pcp3 = new PureColorPanel(ThemeColor.primaryColor, 100);
        pcp3.setText("NORTH_WEST");
        JEBadge pcp3Badge = new JEBadge(pcp3, true);
        pcp3Badge.setBadgeLocation(SwingConstants.NORTH_WEST);


        PureColorPanel pcp4 = new PureColorPanel(ThemeColor.greenColor, 100);
        pcp4.setText("SOUTH_WEST");
        JEBadge pcp4Badge = new JEBadge(pcp4, true);
        pcp4Badge.setBadgeLocation(SwingConstants.SOUTH_WEST);

        PureColorPanel pcp5 = new PureColorPanel(ThemeColor.primaryColor, 100);
        JEBadge pcp5Badge = new JEBadge(pcp5);
        pcp5Badge.setCount(8);

        addRow("自定义组件:", CollUtil.newArrayList(pcp1Badge, pcp2Badge, pcp3Badge, pcp4Badge, pcp5Badge));

        // JEBadge with Jlabel
        JEBadge label1Badge = new JEBadge(new JLabel("JLabelBadge1"));
        label1Badge.setCount(55);

        JEBadge label2Badge = new JEBadge(new JLabel("NORTH_EAST"), true);

        JEBadge label3Badge = new JEBadge(new JLabel("SOUTH_EAST"), true);
        label3Badge.setBadgeLocation(SwingConstants.SOUTH_EAST);

        addRow("在JLabel上使用:", CollUtil.newArrayList(label1Badge, label2Badge, label3Badge));

    }


    private void addRow(String category, List<? extends JComponent> components) {
        JPanel row = new JPanel();
        row.add(new JLabel(category));
        components.forEach(c -> row.add(c));
        view.add(row, "wrap");
    }


    public static void main(String[] args) {
        ThemeFlatLaf.install();
        FrameUtil.launchTest(JEBadgeTest.class);
    }


}

;