Aspose.Slides for Python via .NET 25.8 Release Notes

New Features and Enhancements

Other Improvements and Changes

Public API Changes

Added New Property: AudioFrame.caption_tracks

The new property, caption_tracks, has been added to the IAudioFrame interface and implemented in the AudioFrame class. This property returns a collection containing all caption tracks.

The following sample code shows how to insert a new AudioFrame, add captions to it, and save the PowerPoint presentation:

import aspose.slides as slides

with slides.Presentation() as pres:
    with open("audio.mp3", "rb") as f:
        audio = pres.audios.add_audio(f)

    audio_frame = pres.slides[0].shapes.add_audio_frame_embedded(10, 10, 50, 50, audio)

    # Adds the new captions track from file
    audio_frame.caption_tracks.add("New track", "track.vtt")

    pres.save("audio with captions.pptx", slides.export.SaveFormat.PPTX)

The following example demonstrates how to extract captions from the AudioFrame on the first slide and save them to files:

import aspose.slides as slides

with slides.Presentation("audio with captions.pptx") as pres:
    for shape in pres.slides[0].shapes:
        if type(shape) is slides.AudioFrame:
            for caption_track in shape.caption_tracks:
                # Saves the caption track's binary data as a .vtt file
                with open(str(caption_track.caption_id) + ".vtt", "wb") as f:
                    f.write(caption_track.binary_data)

The following example shows how to remove all captions from an AudioFrame and save the PowerPoint presentation:

import aspose.slides as slides

with slides.Presentation("audio with captions.pptx") as pres:
    audio_frame = pres.slides[0].shapes[0]

    # Remove all captions from the AudioFrame
    audio_frame.caption_tracks.clear()

    pres.save("audio without captions.pptx", slides.export.SaveFormat.PPTX)

Added New Methods: get_script_font_map(), get_script_font(), set_script_font() and remove_script_font()

New methods get_script_font_map, get_script_font, set_script_font and remove_script_font added to IFonts interface and its implementation. These enhancements allow developers to programmatically access, set, remove, and list font mappings for different script tags (e.g., Latn, Cyrl, Jpan) following the BCP-47 script code standard. These APIs are particularly useful for customizing font behavior in multilingual presentations. For example, when working with East Asian, Arabic, Hebrew, or Devanagari scripts, it’s now possible to apply precise font control to match branding or localization requirements.

Code example:

import aspose.slides as slides

with slides.Presentation(pptx_file_name) as pres:
    script_font_map = pres.master_theme.font_scheme.major.get_script_font_map()
    for kvp in script_font_map:
        print(kvp.key + " ? " + kvp.value)

    print(pres.master_theme.font_scheme.major.get_script_font("Thaa"))

    pres.master_theme.font_scheme.major.set_script_font("Thaa", "Super Thaa")
    pres.master_theme.font_scheme.minor.remove_script_font("Geor")

Added New Methods: find_shapes_by_placeholder_type() and get_text_boxes_contains_text() in SlideUtil

In previous versions of Aspose.Slides for Python via .NET, there were cases, when adding placeholders from a layout to a slide, the placeholder text was copied along with its shape. Since this behavior does not match that of PowerPoint, starting from Aspose.Slides for Python via .NET 25.8, this inconsistency has been corrected. The new get_text_boxes_contains_text and find_shapes_by_placeholder_type methods have been added to the SlideUtil class to make it easier to switch to the new version.

Usage examples:

If you previously used the SlideUtil.get_all_text_boxes(slide) method to search for specific text in all slide shapes, including placeholders, for example like this:

import aspose.slides as slides

with slides.Presentation() as presentation:
    slide = presentation.slides.add_empty_slide(presentation.layout_slides[0])
    for text_frame in slides.util.SlideUtil.get_all_text_boxes(slide):
        if "test text" in text_frame.text:
            text_frame.text = "The new test text"

then you can now use the SlideUtil.get_text_boxes_contains_text(slide, text, check_placeholder_text) method with check_placeholder_text = True to achieve the same functionality:

import aspose.slides as slides

with slides.Presentation() as presentation:
    slide = presentation.slides.add_empty_slide(presentation.layout_slides[0])
    for text_frame in slides.util.SlideUtil.get_text_boxes_contains_text(slide, "test text", True):
        text_frame.text = "The new test text!"

The following example demonstrates how to find all “Text” placeholders on a slide:

import aspose.slides as slides

with slides.Presentation(file_path) as presentation:
    for shape in slides.util.SlideUtil.find_shapes_by_placeholder_type(presentation.slides[0], slides.PlaceholderType.BODY):
        if shape.placeholder.orientation == slides.Orientation.VERTICAL:
            shape.text_frame.text = "This is a Text (Vertical) placeholder."
        elif shape.placeholder.orientation == slides.Orientation.HORIZONTAL:
            shape.text_frame.text = "This is a Text placeholder."

Implemented Brightness and Contrast Effect reading

Added IBrightnessContrast interface and its implementation BrightnessContrast class

The BrightnessContrast represents BrightnessContrast effect, which allows you to adjust brightness and contrast.

Added IBrightnessContrastEffectiveData interface

The IBrightnessContrastEffectiveData is an interface which represents a BrightnessContrast effect.

Added add_brightness_contrast_effect(brightness, contrast) method to the IImageTransformOperationCollection interface and to its implementation ImageTransformOperationCollection class

This method adds the new BrightnessContrast effect to the end of a collection. The brightness is the percent to change the brightness, the contrast is the percent to change the contrast. The method returns the index of the new image effect in a collection.

The following sample code shows how to use new interfaces and classes. Please note that the current implementation doesn’t allow to change brightness and contrast values, the effect is not implemented and cannot be applied. It allows to get brightness and contrast values of BrightnessContrast effect if they are present.

import aspose.slides as slides

with slides.Presentation(path_to_presentation) as presentation:
    slide = presentation.slides[0]
    picture_frame = slide.shapes[0]
    image_transform = picture_frame.picture_format.picture.image_transform

    for effect in image_transform:
        if type(effect) is slides.effects.BrightnessContrast:
            brightness_contrast_data = effect.get_effective()
            brightness = brightness_contrast_data.brightness
            contrast = brightness_contrast_data.contrast
            # ...

Implemented the ability to extract data from Excel tables and use it in PowerPoint presentations

The following interfaces and classes have been added:

• IExcelDataWorkbook, ExcelDataWorkbook
• IExcelDataCell, ExcelDataCell

Unlike the ChartDataWorkbook, which is designed specifically to handle data used in charts and is tightly integrated with chart-related functionality, the newly introduced types - ExcelDataWorkbook and related classes - offer a more flexible and general-purpose approach to accessing data from Excel workbooks. These types provide read-only access to Excel content, enabling developers to retrieve values from cells, access worksheet names, and interact with Excel structures.

Added IExcelDataWorkbook interface and ExcelDataWorkbook class

The ExcelDataWorkbook class provides functionality to load an Excel workbook from a file path or stream. It offers several overloads for retrieving data cells.

Added IExcelDataCell interface and ExcelDataCell class

TheExcelDataCell class represents a single cell in an Excel workbook. It exposes properties such as cell name, position, and value.

The following example demonstrates how to extract a value from a cell:

import aspose.slides as slides

wb = slides.excel.ExcelDataWorkbook("TestWorkbook.xlsx")
cell = wb.get_cell("Sheet1", "B2")
print(cell.value)

The following example demonstrates how to retrieve worksheet names and chart names from an Excel workbook:

import aspose.slides as slides

workbook = slides.excel.ExcelDataWorkbook("excelfile.xlsx")
sheet_names = workbook.get_worksheet_names()

for name in sheet_names:
    print("Worksheet " + name + " has the following charts:")
    sheet_charts = workbook.get_charts_from_worksheet(name)
    for chart in sheet_charts:
        print(chart.key, "-", chart.value)

Support for importing charts from an Excel workbook into a presentation

The new ExcelWorkbookImporter class has been added. It provides functionality for importing content from an Excel workbook into a presentation.

The following example demonstrates how to import all charts from an Excel workbook to a presentation. Only the chart data will be embedded:

import aspose.slides as slides

workbook = slides.excel.ExcelDataWorkbook("excelfile.xlsx")
with slides.Presentation() as pres:
    blank_layout = pres.layout_slides.get_by_type(slides.SlideLayoutType.BLANK)
    worksheet_names = workbook.get_worksheet_names()
    for name in worksheet_names:
        worksheet_charts = workbook.get_charts_from_worksheet(name)
        for chart in worksheet_charts:
            slide = pres.slides.add_empty_slide(blank_layout)
            slides.importing.ExcelWorkbookImporter.add_chart_from_workbook(slide.shapes, 10, 10, workbook, name, chart.key, False)

    pres.save("result.pptx", slides.export.SaveFormat.PPTX)

The following example demonstrates how to import the chart from a workbook file by its name and worksheet name. The chart will link to the external workbook:

import aspose.slides as slides

with slides.Presentation() as pres:
    slides.importing.ExcelWorkbookImporter.add_chart_from_workbook(pres.slides[0].shapes, 10, 10, "excelfile.xlsx", "worksheet name", "chart name", False)
    pres.save("result.pptx", slides.export.SaveFormat.PPTX)

The following code demonstrates how to import the chart from a workbook stream by its name and worksheet name. The entire workbook will be embedded in the chart:

import aspose.slides as slides

with open("excelfile.xlsx", "rb") as f, slides.Presentation() as pres:
    slides.importing.ExcelWorkbookImporter.add_chart_from_workbook(pres.slides[0].shapes, 10, 10, f, "worksheet names", "chart name", True)
    pres.save("result.pptx", slides.export.SaveFormat.PPTX)