在 Java 中为 PDF 文本添加工具提示

Aspose.PDF for Java 允许您通过在文本片段上放置表单字段来添加交互式帮助。

为匹配的文本添加工具提示

当 PDF 中的现有文本在悬停时应显示工具提示时，请使用此示例。

1. 创建示例 PDF 并重新打开以进行编辑。
2. 使用以下方式搜索目标文本片段 TextFragmentAbsorber。
3. 放置 ButtonField 在匹配的文本上覆盖并分配工具提示文本。
4. 保存更新后的文档。

public static void addToolTipToSearchedText(Path outputFile) {
        Document document = new Document();
        document.getPages().add().getParagraphs()
                .add(new TextFragment("Move the mouse cursor here to display a tooltip"));
        document.getPages().get_Item(1).getParagraphs()
                .add(new TextFragment("Move the mouse cursor here to display a very long tooltip"));
        document.save(outputFile.toString());
        document.close();

        document = new Document(outputFile.toString());
        TextFragmentAbsorber absorber = new TextFragmentAbsorber(
                "Move the mouse cursor here to display a tooltip");
        document.getPages().accept(absorber);

        for (TextFragment fragment : absorber.getTextFragments()) {
            ButtonField field = new ButtonField(fragment.getPage(), fragment.getRectangle());
            field.setAlternateName("Tooltip for text.");
            document.getForm().add(field);
        }

        absorber = new TextFragmentAbsorber("Move the mouse cursor here to display a very long tooltip");
        document.getPages().accept(absorber);

        for (TextFragment fragment : absorber.getTextFragments()) {
            ButtonField field = new ButtonField(fragment.getPage(), fragment.getRectangle());
            field.setAlternateName("Lorem ipsum dolor sit amet, consectetur adipiscing elit,"
                    + " sed do eiusmod tempor incididunt ut labore et dolore magna"
                    + " aliqua. Ut enim ad minim veniam, quis nostrud exercitation"
                    + " ullamco laboris nisi ut aliquip ex ea commodo consequat."
                    + " Duis aute irure dolor in reprehenderit in voluptate velit"
                    + " esse cillum dolore eu fugiat nulla pariatur. Excepteur sint"
                    + " occaecat cupidatat non proident, sunt in culpa qui officia"
                    + " deserunt mollit anim id est laborum.");
            document.getForm().add(field);
        }

        document.save(outputFile.toString());
        document.close();
    }

在悬停时显示漂浮文本块

当将鼠标悬停在文本区域上时，应显示隐藏的文本字段，请使用此示例。

1. 创建示例 PDF 并重新打开以进行编辑。
2. 查找触发文本片段 TextFragmentAbsorber。
3. 创建隐藏 TextBoxField 和一个 ButtonField 带有进入和退出操作。
4. 保存最终的 PDF。

public static void createHiddenTextBlock(Path outputFile) {
    Document document = new Document();
    document.getPages().add().getParagraphs()
            .add(new TextFragment("Move the mouse cursor here to display floating text"));
    document.save(outputFile.toString());
    document.close();

    document = new Document(outputFile.toString());
    TextFragmentAbsorber absorber = new TextFragmentAbsorber(
            "Move the mouse cursor here to display floating text");
    document.getPages().accept(absorber);
    TextFragment fragment = absorber.getTextFragments().get_Item(1);

    TextBoxField floatingField = new TextBoxField(
            fragment.getPage(), new Rectangle(100.0, 700.0, 220.0, 740.0, false));
    floatingField.setValue("This is the \"floating text field\".");
    floatingField.setReadOnly(true);
    floatingField.setFlags(floatingField.getFlags() | AnnotationFlags.Hidden);
    floatingField.setPartialName("FloatingField_1");
    floatingField.setDefaultAppearance(new DefaultAppearance("Helv", 10, java.awt.Color.BLUE));
    floatingField.getCharacteristics().setBackground(java.awt.Color.CYAN);
    floatingField.getCharacteristics().setBorder(java.awt.Color.BLUE);
    floatingField.setBorder(new Border(floatingField));
    floatingField.getBorder().setWidth(1);
    floatingField.setMultiline(true);

    document.getForm().add(floatingField);

    ButtonField buttonField = new ButtonField(fragment.getPage(), fragment.getRectangle());
    buttonField.getAnnotationActions().setOnEnter(new HideAction(floatingField, false));
    buttonField.getAnnotationActions().setOnExit(new HideAction(floatingField));

    document.getForm().add(buttonField);
    document.save(outputFile.toString());
    document.close();
}