Canvas Developer Guide
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Chatter Feed Context Considerations
When you display a canvas app inside of a feed item, the
context information you receive from the signed request or from a getContext() call contains information
specific to the feed:
- Location—If the canvas app is in the feed, then the Environment.displayLocation field contains the value ChatterFeed.
- Parameters—When you create a feed item that contains a canvas app, you can specify a JSON string as the parameters value. When the canvas app receives the context, the parameters in the feed item will be contained in the Environment.Parameters object.
- Size—The Environment.Dimensions object contains information about the size of the canvas app.
- The canvas app height defaults to 100 pixels.
- The canvas app width defaults to 420 pixels, which is the same as the maximum width of a canvas app in the feed.
- The maximum height of a canvas app in the feed is 400 pixels.
- The maximum width of a canvas app in the feed is 420 pixels.
- This code snippet shows the default size values of a canvas app
in the feed:
- The feed is a fixed width of 420 pixels. For example, if you resize your canvas app to be 200 pixels, the feed width remains 420 pixels.
- You can use the resize() method in the Force.com Canvas SDK to change the values of your canvas app up to the maxHeight and maxWidth.