使用 JavaScript 管理簡報中的項目符號與編號清單

概觀

Aspose.Slides for Node.js via Java 讓您在 PowerPoint 和 OpenDocument 簡報中建立與格式化項目符號與編號清單。清單項目是其段落設定受段落格式控制的段落。

使用 Paragraph 類別可存取段落層級的清單設定。主要入口為 Paragraph.getParagraphFormat().getBullet(),它會傳回一個 BulletFormat 物件。透過此物件,您可以設定項目符號類型、符號、圖片、顏色、大小、編號樣式與起始編號。

本篇說明如何:

  • 建立自訂符號的項目符號清單
  • 建立圖片項目符號
  • 透過設定段落深度建立多層次清單
  • 建立編號清單
  • 檢視與變更現有簡報中的清單格式

建立項目符號清單

若要建立項目符號清單,請將 Paragraph 物件加入 TextFrame,並將 BulletFormat.setType 設為 BulletType.Symbol。之後即可使用 BulletFormat.setCharBulletFormat.getColorBulletFormat.setHeight 來控制項目符號外觀。

以下 JavaScript 程式碼示範了如何在投影片中建立項目符號清單:

function createParagraph(text, bulletColor) {
    const paragraph = new aspose.slides.Paragraph();
    const paragraphFormat = paragraph.getParagraphFormat();
    const bulletFormat = paragraphFormat.getBullet();

    bulletFormat.setType(java.newByte(aspose.slides.BulletType.Symbol));
    bulletFormat.setChar(java.newChar("*"));
    paragraphFormat.setIndent(15);
    bulletFormat.setBulletHardColor(java.newByte(aspose.slides.NullableBool.True));
    bulletFormat.getColor().setColor(bulletColor);
    bulletFormat.setHeight(100);
    paragraph.setText(text);

    return paragraph;
}

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);
    const autoShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 20, 20, 200, 50);

    const textFrame = autoShape.getTextFrame();
    textFrame.getParagraphs().clear();

    const bulletColor = java.newInstanceSync("java.awt.Color", 205, 92, 92);

    const paragraph1 = createParagraph("The first paragraph", bulletColor);
    textFrame.getParagraphs().add(paragraph1);

    const paragraph2 = createParagraph("The second paragraph", bulletColor);
    textFrame.getParagraphs().add(paragraph2);

    presentation.save("symbol_bullets.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

結果:

The symbol bullets

建立編號清單

當項目順序重要時,使用編號清單。將 BulletFormat.setType 設為 BulletType.Numbered。您也可以使用 BulletFormat.setNumberedBulletStyle 來選擇編號格式,或在清單需從非 1 的值開始時使用 BulletFormat.setNumberedBulletStartWith

以下 JavaScript 程式碼示範了如何在投影片中建立編號清單:

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);
    const autoShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 20, 20, 90, 80);

    const textFrame = autoShape.getTextFrame();
    textFrame.getParagraphs().clear();

    const paragraph1 = new aspose.slides.Paragraph();
    paragraph1.getParagraphFormat().getBullet().setType(java.newByte(aspose.slides.BulletType.Numbered));
    paragraph1.setText("Apple");
    textFrame.getParagraphs().add(paragraph1);

    const paragraph2 = new aspose.slides.Paragraph();
    paragraph2.getParagraphFormat().getBullet().setType(java.newByte(aspose.slides.BulletType.Numbered));
    paragraph2.setText("Orange");
    textFrame.getParagraphs().add(paragraph2);

    const paragraph3 = new aspose.slides.Paragraph();
    paragraph3.getParagraphFormat().getBullet().setType(java.newByte(aspose.slides.BulletType.Numbered));
    paragraph3.setText("Banana");
    textFrame.getParagraphs().add(paragraph3);

    presentation.save("numbered_bullets.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

結果:

The numbered bullets

建立圖片項目符號

Aspose.Slides 允許您以影像取代一般的項目符號。圖片項目符號最適合使用在小尺寸仍能保持可讀性的簡單圖案,例如圖示或小型透明 PNG 檔。

要建立圖片項目符號,先使用 Presentation.getImages().addImage 將影像加入 Presentation,並將回傳的 PPImage 物件指派給 BulletFormat.getPicture().setImage。在指定影像前,先將 BulletFormat.setType 設為 BulletType.Picture

假設我們有一個 “image.png”:

A picture for the bullets

以下 JavaScript 程式碼示範了如何在投影片中建立圖片項目符號:

function createParagraph(text, image) {
    const paragraph = new aspose.slides.Paragraph();
    const paragraphFormat = paragraph.getParagraphFormat();
    const bulletFormat = paragraphFormat.getBullet();

    bulletFormat.setType(java.newByte(aspose.slides.BulletType.Picture));
    bulletFormat.getPicture().setImage(image);
    paragraphFormat.setIndent(15);
    bulletFormat.setHeight(100);
    paragraph.setText(text);

    return paragraph;
}

const presentation = new aspose.slides.Presentation();
let image = null;
try {
    const slide = presentation.getSlides().get_Item(0);
    const autoShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 20, 20, 200, 50);

    const textFrame = autoShape.getTextFrame();
    textFrame.getParagraphs().clear();

    image = aspose.slides.Images.fromFile("image.png");
    const bulletImage = presentation.getImages().addImage(image);

    const paragraph1 = createParagraph("The first paragraph", bulletImage);
    textFrame.getParagraphs().add(paragraph1);

    const paragraph2 = createParagraph("The second paragraph", bulletImage);
    textFrame.getParagraphs().add(paragraph2);

    presentation.save("picture_bullets.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    if (image !== null) {
        image.dispose();
    }
    presentation.dispose();
}

結果:

The picture bullets

建立多層次清單

使用 ParagraphFormat.setDepth 可將清單項目放置於不同層級。層級 0 為最上層,層級 1 為其下的子層,依此類推。

以下 JavaScript 程式碼示範了如何建立多層次項目符號清單:

const presentation = new aspose.slides.Presentation();
try {
    const slide = presentation.getSlides().get_Item(0);
    const autoShape = slide.getShapes().addAutoShape(aspose.slides.ShapeType.Rectangle, 20, 20, 260, 110);

    const textFrame = autoShape.getTextFrame();
    textFrame.getParagraphs().clear();

    const paragraph1 = new aspose.slides.Paragraph();
    paragraph1.getParagraphFormat().setDepth(java.newShort(0));
    paragraph1.setText("My text - Depth 0");
    textFrame.getParagraphs().add(paragraph1);

    const paragraph2 = new aspose.slides.Paragraph();
    paragraph2.getParagraphFormat().setDepth(java.newShort(1));
    paragraph2.setText("My text - Depth 1");
    textFrame.getParagraphs().add(paragraph2);

    const paragraph3 = new aspose.slides.Paragraph();
    paragraph3.getParagraphFormat().setDepth(java.newShort(2));
    paragraph3.setText("My text - Depth 2");
    textFrame.getParagraphs().add(paragraph3);

    const paragraph4 = new aspose.slides.Paragraph();
    paragraph4.getParagraphFormat().setDepth(java.newShort(3));
    paragraph4.setText("My text - Depth 3");
    textFrame.getParagraphs().add(paragraph4);

    presentation.save("multilevel_bullets.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

結果:

The multilevel list

變更既有清單

若要變更既有簡報中的清單格式,存取目標段落並更新其 ParagraphFormat.getBullet 設定。建立清單時使用的相同屬性,也可用於檢視或修改從 PPT、PPTX 或 ODP 檔案載入的清單。

以下 JavaScript 程式碼將文字框中的第一個段落改為使用編號清單樣式:

const presentation = new aspose.slides.Presentation("input.pptx");
try {
    const slide = presentation.getSlides().get_Item(0);
    const autoShape = slide.getShapes().get_Item(0);
    const paragraph = autoShape.getTextFrame().getParagraphs().get_Item(0);

    const paragraphFormat = paragraph.getParagraphFormat();
    const bulletFormat = paragraphFormat.getBullet();

    bulletFormat.setType(java.newByte(aspose.slides.BulletType.Numbered));
    bulletFormat.setNumberedBulletStyle(java.newByte(aspose.slides.NumberedBulletStyle.BulletRomanUCPeriod));
    bulletFormat.setNumberedBulletStartWith(java.newShort(1));
    paragraphFormat.setMarginLeft(30);
    paragraphFormat.setIndent(-20);

    presentation.save("updated_list.pptx", aspose.slides.SaveFormat.Pptx);
} finally {
    presentation.dispose();
}

常見問題

項目符號與編號清單能匯出為 PDF 或影像嗎?

可以。Aspose.Slides 會保留清單格式,前提是目標格式支援對應的文字排版與項目符號功能。

我可以編輯既有簡報中的清單嗎?

可以。載入簡報、存取目標段落、檢視或更新其 ParagraphFormat.getBullet 設定,然後儲存簡報。

清單可以包含非拉丁文字嗎?

可以。清單項目文字支援 Unicode 字元,您可以在多語言簡報中建立清單。請確保簡報使用的字型支援您所需的字元。