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Python design pattern how to use state mode to achieve editing functions, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can get something.

Function introduction

Added object selection, connection line editing function.

New object selection status indicates connection line linkage and link line adjustment function. For specific actions, please refer to the following video:

Code implementation

Build a state diagram

The implementation of this part mainly uses the state mode. The first part is the construction of the state mechanism.

The content of the code is to generate various states and then establish a migration relationship.

Idle state

The idle state handles mouse click and double click times, adding functionality corresponding to object selection and features.

Move feature statu

Handle mouse drag and release events, and use object movement function.

Increase connection line statu

Handle mouse movement (not dragging), left-click, right-click, left-click events, corresponding to the end movement of the connection line, the increase of the end point, the end point fallback and the completion of the connection line function.

Mobile link status

Handle the left mouse button drag and release event. Corresponding to the link line drag and end drag processing.

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