GraphicsItemResizer is a QGraphicsItem for interactive resizing of some target rectangular area (for example, to change size and position of some QGraphicsItem, as in demo project). It shows 8 handles within container item for each resizing direction and supports minimum size constraint for target rect (i.e. you can't make size of target rect smaller than specified).

Copy resizer dir to your project. Include file resizer/graphicsitemresizer.h. Create instance of GraphicsItemResizer class, set initial target area size and minimum size if needed.

Use setTargetSize slot to notify resizer item about target area size changes.

To handle size and position changes subscribe to GraphicsItemResizer::targetRectChanged signal. Position of received rectangle contains target area's left top corner offset and size is equal to new size.

You can change pen and brush for resizer handles using setPen and setBrush methods.

Use setHandlersIgnoreTransformations to force handler items ignore all transformations. For example, it would be useful when attached graphics views can be zoomed or rotated - handlers will have the same size and relative position.

Resizer item is licensed under the Apache License, Version 2.0. See LICENSE for details.