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direct-manipulation-swift's Issues

Add CatalogByConvention dependency

  • Add dependency to Podfile.
  • Use CatalogByConvention view controller to instantiate the root view controller.
  • Implement breadcrumbs on each example view controller.
  • Add TableOfContents.swift file to root of catalog project.

Scale delta isn't being applied correctly to the target's scale

We should be calculating the relative scale change between each event using division, not subtraction.

E.g.

oldScale = 1.2
newScale = 1.7
difference = 0.5
current code scale = 1 + difference = 1.5
actual amount scaled = 1.7 / 1.2 = 1.41666666666667

Note the discrepancy between the actual "amount scaled" and what we apply to the view.

DirectlyManipulable should not expose plans in its public API

This is leaking the implementation details of the plan.

Instead, let's just expose the gesture recognizers. We intentionally won't expose shouldAdjustAnchorPointOnGestureStart because we always want this property to be true for DirectlyManipulable.

Pinchable/Rotatable/Draggable should not emit anchor point adjustment

Only DirectlyManipulable should.

Rationale being that if you are using any of Pinchable/Rotatable/Draggable then it is very unlikely that you will want to modify the anchor point each time the gesture recognizer begins. This type of behavior only makes sense if you have all three plans operating in tandem (i.e. with DirectlyManipulable).

  • Deprecate shouldAdjustAnchorPointOnGestureStart on all three APIs.
  • Emit an anchor point change from DirectlyManipulable on gesture start.

Add example demonstrating how to use ChangeAnchorPoint

One idea is to visualize the anchor point of the view and to allow you to change it by tapping anywhere in the view. We could include labels showing the view's position in order to show what's going on with the underlying .position value when we change the anchor point.

Write the README.md

Should include the following:

  • Installation steps. (Steal the ones from here).
  • Getting started example.

Assume that this repo is the entry-point for an application developer who has never used Material Motion before. We'll likely want to link to some form of "getting started with material motion" document. Life of a plan might be a good start, but we should have a swift version as well.

Introduce an instantly-reactive gesture recognizer for pan/pinch/rotate

UIKit's gesture recognizers include a slop region. This slop region isn't always desirable for direct manipulation scenarios.

We should explore how we might provide pinch/rotate/pan support without a slop region.

One option is to implement a new UIGestureRecognizer subclass. This means we need to implement our own velocity calculations, which poses a serious risk of deviating from UIKit's velocity calculation logic.

If we can somehow utilize the existing gesture recognizers that would be preferable.

Objective-C usage

  • All class names need to have an @objc(MDM...) name mapping.
  • Should include an Objective-C unit test file called "ObjectiveCAPITests.m" that simply instantiates each of the public APIs. These tests are meant to flag any regression in Objective-C support. All other tests can still be written in Swift.

Remove BlockGesturable type

This plan is somewhat too powerful in that it allows arbitrary blocks to be provided to it. This can leak separation of concerns back to the creator of the plan.

Example:

BlockGesturable(withGestureRecognizer: gesture) { gesture in
  // Dangerous: access internal state of the registering agent
}

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