Pinchable ScrollRect for Unity

Pinchable ScrollRect allows users to zoom in and out on the ScrollRect with both touches pinching input or mouse scroll input.

Features

• Customizable pinching behaviour with inherited Unity ScrollRect behaviour.
• Overridden OnScroll behaviour for mouse scroll to perform zooming behaviour.
• Customized pinching gesture to perform the same zooming behaviour as mouse scroll input for touches.
• Transformed standard Unity Event IPointerUp & IPointerDown interface into IPinch interface for further customization of touch behaviour

Getting Started

• Use it same as the way you use the Unity ScrollRect component.
• Add a UI/ScrollView from the GameObject Menu
• Select the ScrollRect added, click on the context dropdown menu
• Select "Replace as Pinchable"

Important Remarks

• PinchInputDetector component must have a higher execution order than PinchableScrollRect component or any IPinchHandler component in order to consume the original OnDrag pointer event beforehand.
• Without PinchInputDetector, the ScrollRect can still perform zooming with mouse scroll input but not touch input.
• The absolute minimum scale of the Content of the ScrollRect is 1. A customizable lower bound and upper bound of the scale can be set on inspector.
• Any third touches detected after pinching will be ignore, even after both pinching touches are lifted.
• Editor script is needed in order to serialize the extra fields added to the PinchableScrollRect component.

License

This plugin is licensed under the MIT License - see the LICENSE file for details.