The Puzzle example shows how to enable drag and drop with a custom model to allow items to be transferred between a view and another widget.
This example is an implementation of a simple jigsaw puzzle game using the built-in support for drag and drop provided by Qt's model/view framework. The 拖放拼图 example shows many of the same features, but takes an alternative approach that uses Qt's drag and drop API at the application level to handle drag and drop operations.
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