45 lines
1.6 KiB
Java
45 lines
1.6 KiB
Java
package hae.utils;
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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.FocusEvent;
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import java.awt.event.FocusListener;
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public class UIEnhancer {
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public static void setTextFieldPlaceholder(JTextField textField, String placeholderText) {
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// 使用客户端属性来存储占位符文本和占位符状态
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textField.putClientProperty("placeholderText", placeholderText);
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textField.putClientProperty("isPlaceholder", true);
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// 设置占位符文本和颜色
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setPlaceholderText(textField);
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textField.addFocusListener(new FocusListener() {
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@Override
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public void focusGained(FocusEvent e) {
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// 当获得焦点且文本是占位符时，清除文本并更改颜色
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if ((boolean) textField.getClientProperty("isPlaceholder")) {
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textField.setText("");
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textField.setForeground(Color.BLACK);
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textField.putClientProperty("isPlaceholder", false);
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}
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}
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@Override
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public void focusLost(FocusEvent e) {
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// 当失去焦点且文本为空时，设置占位符文本和颜色
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if (textField.getText().isEmpty()) {
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setPlaceholderText(textField);
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}
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}
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});
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}
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private static void setPlaceholderText(JTextField textField) {
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String placeholderText = (String) textField.getClientProperty("placeholderText");
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textField.setForeground(Color.GRAY);
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textField.setText(placeholderText);
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textField.putClientProperty("isPlaceholder", true);
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}
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}
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