methods.lzx

<canvas>
  <button onclick="vw.toggleSize()" text="Toggle Size"/>
  
  <view id="vw" y="30" width="100" height="200" bgcolor="blue">
    <wrappinglayout spacing="10" xinset="5" yinset="5"/>
    <view bgcolor="yellow" width="20" height="20"/>
    <view bgcolor="yellow" width="20" height="20"/>
    <view bgcolor="yellow" width="20" height="20"/>
    <view bgcolor="yellow" width="20" height="20"/>
    <view bgcolor="yellow" width="20" height="20"/>
    
    <method name="toggleSize">
      var w = this.width;
      var h = this.height;
      this.setAttribute('width', h);
      this.setAttribute('height', w);
    </method>
  </view>
</canvas>