UnityUI and CohtmlView

If you want to use the UnityUI Canvas in combination with Prysm for your UI implementation, you can render the CohtmlView component in a Canvas UI. Generally, the CohtmlView component renders the HTML content into a Render Texture object which you can feed into the RawImage component and use the Canvas to render it. You can achieve this by simply adding a new object to the hierarchy of a Canvas component, or by adding the CohtmlView component to an existing object. If you place the CohtmlView component on a game object that does not have a Raw Image component, the integration code will add such automatically. You can adjust the Rect Transform position of the game object which is the CohtmlView component in the Canvas hierarchy to fine-tune the rendering order of the RawImage texture. Alternatively, you could use multiple Canvas objects for more complex UI compositions.

Input #

The input for CohtmlView components when rendered in a Canvas behaves in a similar way as if they were added as regular objects outside of the UnityUI hierarchy. However, there are a few specifics to keep in mind:

• When a CohtmlView component has the Raycast Target option enabled (which is the default), it will try to handle the input and propagate to other CohtmlView components underneath if no UI elements consumed the input event. You can find more information about this on the Input Handling page of our documentation.
• To disable the input, toggle the Raycast Target option under the Input category of your CohtmlView component.
• The Raycast Target option of the RawImage component will only control whether the input will go through and propagate to other UnityUI elements underneath the image.

CohtmlView in UnityUI Canvas and BackdropFilter #

Currently, Unity3D does not offer a way (e.g. an event or callback) to check that a Canvas object has been drawn on the screen. This is necessary to ensure the correct rendering of certain features like Backdrop Filter. To achieve the Backdrop Filter affect with CohtmlView rendered in Canvas, you can follow the steps below:

• Add a CohtmlView to a game object in the Canvas, which is in Screen Space - Overlay mode.
• Add all UI elements you want to be rendered behind the CohtmlView to a second Canvas in either Screen Space - Camera or World Space mode.