Add Slides to Presentations in Java

Add a Slide to a Presentation

Before talking about adding slides to the presentation files, let us discuss some facts about the slides. Each PowerPoint presentation file contains Master / Layout slide and other Normal slides. It means that a presentation file contains at least one or more slides. It is important to know that presentation files without slides are not supported by Aspose.Slides for Java. Each slide has a unique Id and all the Normal Slides are arranged in an order specified by the zero-based index.

Aspose.Slides for Java allows developers to add empty slides to their presentation. To add an empty slide in the presentation, please follow the steps below:

• Create an instance of Presentation class.
• Instantiate ISlideCollection class by setting a reference to the Slides (collection of content Slide objects) property exposed by the Presentation object.
• Add an empty slide to the presentation at the end of the content slides collection by calling the addEmptySlide methods exposed by ISlideCollection object.
• Do some work with the newly added empty slide.
• Finally, write the presentation file using the Presentation object.

// Instantiate Presentation class that represents the presentation file
Presentation pres = new Presentation();
try {
    // Instantiate SlideCollection calss
    ISlideCollection slds = pres.getSlides();

    for (int i = 0; i < pres.getLayoutSlides().size(); i++) {
        // Add an empty slide to the Slides collection
        slds.addEmptySlide(pres.getLayoutSlides().get_Item(i));
    }
    // Do some work on the newly added slide

    // Save the PPTX file to the Disk
    pres.save("EmptySlide.pptx", SaveFormat.Pptx);
} finally {
    pres.dispose();
}

FAQ

Can I insert a new slide at a specific position, not just at the end?

Yes. The library supports slide collections and insert/clone operations, so you can add a slide at the required index rather than only at the end.

Are the theme/styles preserved when adding a slide based on a layout?

Yes. A layout inherits formatting from its master, and the new slide inherits from the selected layout and its associated master.

Which slide is present in a new “empty” presentation before adding slides?

A newly created presentation already contains one blank slide with index zero. This is important to consider when calculating insertion indices.

How do I choose the “right” layout for a new slide if the master has many options?

Generally choose the LayoutSlide that matches the required structure (Title and Content, Two Content, etc.). If such a layout is missing, you can add it to the master and then use it.