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How to override QgsMapCanvas default zoom behavior?

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I'm writing a standalone QGIS Python app. I've subclassed QgsMapTool and have successfully implemented some selection capabilities. Now I'm trying to implement my own zoom behavior, using the same map tool, but QgsMapCanvas seems to have some built-in zooming behavior. How can disable the built-in zooming and get complete control over the mouse wheel?

class MyMapTool(QgsMapTool):

    ...

    def wheelEvent(self, event):

        new_extent = QgsRectangle(...)

        self.canvas.setExtent(new_extent)

        # Something else is messing with the extent.

        # How can I disable it and use my new_extent?



# Set the tool to the canvas. This is the only Map Tool I use.

tool = MyMapTool(self.canvas)

self.canvas.setMapTool(tool)

qgis python

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asked 1 min ago

mark78mark78

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add a comment | 

0

I'm writing a standalone QGIS Python app. I've subclassed QgsMapTool and have successfully implemented some selection capabilities. Now I'm trying to implement my own zoom behavior, using the same map tool, but QgsMapCanvas seems to have some built-in zooming behavior. How can disable the built-in zooming and get complete control over the mouse wheel?

class MyMapTool(QgsMapTool):

    ...

    def wheelEvent(self, event):

        new_extent = QgsRectangle(...)

        self.canvas.setExtent(new_extent)

        # Something else is messing with the extent.

        # How can I disable it and use my new_extent?



# Set the tool to the canvas. This is the only Map Tool I use.

tool = MyMapTool(self.canvas)

self.canvas.setMapTool(tool)

qgis python

share

asked 1 min ago

mark78mark78

161

add a comment | 

I'm writing a standalone QGIS Python app. I've subclassed QgsMapTool and have successfully implemented some selection capabilities. Now I'm trying to implement my own zoom behavior, using the same map tool, but QgsMapCanvas seems to have some built-in zooming behavior. How can disable the built-in zooming and get complete control over the mouse wheel?

class MyMapTool(QgsMapTool):

    ...

    def wheelEvent(self, event):

        new_extent = QgsRectangle(...)

        self.canvas.setExtent(new_extent)

        # Something else is messing with the extent.

        # How can I disable it and use my new_extent?



# Set the tool to the canvas. This is the only Map Tool I use.

tool = MyMapTool(self.canvas)

self.canvas.setMapTool(tool)

qgis python

share

asked 1 min ago

mark78mark78

161

class MyMapTool(QgsMapTool):

    ...

    def wheelEvent(self, event):

        new_extent = QgsRectangle(...)

        self.canvas.setExtent(new_extent)

        # Something else is messing with the extent.

        # How can I disable it and use my new_extent?



# Set the tool to the canvas. This is the only Map Tool I use.

tool = MyMapTool(self.canvas)

self.canvas.setMapTool(tool)

share

asked 1 min ago

mark78mark78

161

share

asked 1 min ago

mark78mark78

161

asked 1 min ago

mark78mark78

161

asked 1 min ago

mark78mark78

161