merzZoomSupport.py

import vanilla

import merz


class Demo:
    
    def __init__(self):
        # setup window
        self.w = vanilla.Window((400, 400), minSize=(150, 150))
        # add a merz view
        self.w.view = merz.MerzView((0, 0, 0, 0), delegate=self, backgroundColor=(0, 1, 0, 1))
        # get container and add some sublayers
        container = self.w.view.getMerzContainer()
        container.appendOvalSublayer(
            size=(50, 50),
            fillColor=(1, 0, 1, 1),
            position=("center", "center")
        )
        container.appendRectangleSublayer(
            size=(50, 50),
            fillColor=(0, 0, 1, 1),
            position=(10, 10)
        )        
        self.w.open()
    
    # merzview delegate stuff
    def acceptsFirstResponder(self, view):
        # respond with True to accepts user events
        return True
        
    def scrollWheel(self, view, event):
        # get the delta of the scroll
        delta = event.scrollingDeltaY()
        if delta < 0:
            factor = 0.9
        else:
            factor = 1.1
        # get the container of the view
        merzContainer = view.getMerzContainer()
        # get the scale of the container
        scale = merzContainer.getContainerScale()
        # reset with a new scale
        merzContainer.setContainerScale(scale * factor)
  
    
Demo()