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Editorial Team
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Asked: 2026-05-31T08:08:58+00:00

I haven’t found an exact question on this. I have a picture, it could

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I haven’t found an exact question on this.

I have a picture, it could be blank for the sake of the example, or contain something that I want to add a fancy caption to. I want to add text editing means (akin to Photoshop) on top of the picture.

I’m thinking about subclassing QGraphicsScene and placing a subclassed QTextEdit object on the scene upon pressing a text placement button. Then, when you click on this object, in addition to editing the text, additional text editing tools become available – so you can set parts of text to bold, italic, modify color, size, etc. And then you would be able to change the object’s position – and I think that’s available in QGraphicsScene by default. And for the background QBrush, there would be a background picture.

Is this a reasonable solution?

Maybe there are any ready-available examples of this, but I haven’t found them yet.

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1 Answer

  1. Editorial Team

    My solution

    Text item:
    For the text item, I used QGraphicsScene with a subclassed QGraphicsTextItem. For the background picture, I used a QGraphicsRectItem with a QBrush and a loaded picture using QImage methods.

    To edit parts of the selected text in this subclassed QGraphicsTextItem:
    QTextCharFormat applied to my subclassed QGraphicsTextItem using QGraphicsTextItem::textCursor().mergeCharFormat(...). This way I can change formatting, such as boldness, italics, etc. on the selection only.

    Some more thingies:
    To pan and zoom around the scene, I used an excellent guide by Vpicaver complete with source code from http://www.qtcentre.org/wiki/index.php?title=QGraphicsView:_Smooth_Panning_and_Zooming

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