265 lines
10 KiB
C#
265 lines
10 KiB
C#
//-----------------------------------------------------------------------
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// <copyright file="TwoFingerDragGesture.cs" company="Google">
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//
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// Copyright 2018 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// </copyright>
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//-----------------------------------------------------------------------
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// Modifications copyright © 2020 Unity Technologies ApS
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#if AR_FOUNDATION_PRESENT || PACKAGE_DOCS_GENERATION
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using UnityEngine.XR.Interaction.Toolkit.Interactables;
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namespace UnityEngine.XR.Interaction.Toolkit.AR
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{
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/// <summary>
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/// Gesture for when the user performs a two finger vertical swipe motion on the touch screen.
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/// </summary>
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public partial class TwoFingerDragGesture : Gesture<TwoFingerDragGesture>
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{
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/// <summary>
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/// Initializes and returns an instance of <see cref="TwoFingerDragGesture"/>.
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/// </summary>
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/// <param name="recognizer">The gesture recognizer.</param>
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/// <param name="touch1">The first touch that started this gesture.</param>
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/// <param name="touch2">The second touch that started this gesture.</param>
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public TwoFingerDragGesture(TwoFingerDragGestureRecognizer recognizer, Touch touch1, Touch touch2)
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: this(recognizer, new CommonTouch(touch1), new CommonTouch(touch2))
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{
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}
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/// <summary>
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/// Initializes and returns an instance of <see cref="TwoFingerDragGesture"/>.
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/// </summary>
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/// <param name="recognizer">The gesture recognizer.</param>
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/// <param name="touch1">The first touch that started this gesture.</param>
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/// <param name="touch2">The second touch that started this gesture.</param>
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public TwoFingerDragGesture(TwoFingerDragGestureRecognizer recognizer, InputSystem.EnhancedTouch.Touch touch1, InputSystem.EnhancedTouch.Touch touch2)
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: this(recognizer, new CommonTouch(touch1), new CommonTouch(touch2))
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{
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}
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TwoFingerDragGesture(TwoFingerDragGestureRecognizer recognizer, CommonTouch touch1, CommonTouch touch2)
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: base(recognizer)
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{
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Reinitialize(touch1, touch2);
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}
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internal void Reinitialize(Touch touch1, Touch touch2) => Reinitialize(new CommonTouch(touch1), new CommonTouch(touch2));
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internal void Reinitialize(InputSystem.EnhancedTouch.Touch touch1, InputSystem.EnhancedTouch.Touch touch2) => Reinitialize(new CommonTouch(touch1), new CommonTouch(touch2));
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void Reinitialize(CommonTouch touch1, CommonTouch touch2)
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{
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Reinitialize();
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fingerId1 = touch1.fingerId;
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startPosition1 = touch1.position;
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fingerId2 = touch2.fingerId;
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startPosition2 = touch2.position;
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position = (startPosition1 + startPosition2) / 2;
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delta = Vector2.zero;
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}
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/// <summary>
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/// (Read Only) The id of the first finger used in this gesture.
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/// </summary>
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public int fingerId1 { get; private set; }
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/// <summary>
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/// (Read Only) The id of the second finger used in this gesture.
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/// </summary>
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public int fingerId2 { get; private set; }
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/// <summary>
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/// (Read Only) The screen position of the first finger where the gesture started.
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/// </summary>
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public Vector2 startPosition1 { get; private set; }
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/// <summary>
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/// (Read Only) The screen position of the second finger where the gesture started.
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/// </summary>
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public Vector2 startPosition2 { get; private set; }
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/// <summary>
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/// (Read Only) The current screen position of the gesture.
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/// </summary>
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public Vector2 position { get; private set; }
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/// <summary>
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/// (Read Only) The delta screen position of the gesture.
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/// </summary>
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public Vector2 delta { get; private set; }
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/// <summary>
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/// (Read Only) The gesture recognizer.
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/// </summary>
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protected TwoFingerDragGestureRecognizer dragRecognizer => (TwoFingerDragGestureRecognizer)recognizer;
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/// <inheritdoc />
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protected internal override bool CanStart()
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{
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if (GestureTouchesUtility.IsFingerIdRetained(fingerId1) ||
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GestureTouchesUtility.IsFingerIdRetained(fingerId2))
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{
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Cancel();
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return false;
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}
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var foundTouches = GestureTouchesUtility.TryFindTouch(fingerId1, out var touch1);
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foundTouches =
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GestureTouchesUtility.TryFindTouch(fingerId2, out var touch2) && foundTouches;
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if (!foundTouches)
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{
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Cancel();
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return false;
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}
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// Check that at least one finger is moving.
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if (touch1.deltaPosition == Vector2.zero && touch2.deltaPosition == Vector2.zero)
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{
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return false;
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}
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var pos1 = touch1.position;
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var diff1 = (pos1 - startPosition1).magnitude;
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var pos2 = touch2.position;
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var diff2 = (pos2 - startPosition2).magnitude;
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var slopInches = dragRecognizer.slopInches;
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if (GestureTouchesUtility.PixelsToInches(diff1) < slopInches ||
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GestureTouchesUtility.PixelsToInches(diff2) < slopInches)
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{
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return false;
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}
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// Check both fingers move in the same direction.
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var dot = Vector3.Dot(touch1.deltaPosition.normalized, touch2.deltaPosition.normalized);
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return dot >= Mathf.Cos(dragRecognizer.angleThresholdRadians);
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}
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/// <inheritdoc />
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protected internal override void OnStart()
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{
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GestureTouchesUtility.LockFingerId(fingerId1);
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GestureTouchesUtility.LockFingerId(fingerId2);
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#pragma warning disable 618 // Using deprecated property to help with backwards compatibility.
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if (GestureTouchesUtility.RaycastFromCamera(startPosition1, recognizer.xrOrigin, recognizer.arSessionOrigin, out var hit1, recognizer.raycastMask, recognizer.raycastTriggerInteraction))
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#pragma warning restore 618
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{
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var gameObject = hit1.transform.gameObject;
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var grabInteractable = gameObject.GetComponentInParent<XRGrabInteractable>();
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if (grabInteractable != null)
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{
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var interactableObject = grabInteractable.gameObject;
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if (interactableObject != null)
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targetObject = interactableObject;
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}
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else
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{
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#pragma warning disable 618
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var baseGestureInteractable = gameObject.GetComponentInParent<ARBaseGestureInteractable>();
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if (baseGestureInteractable != null)
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{
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var interactableObject = baseGestureInteractable.gameObject;
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if (interactableObject != null)
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targetObject = interactableObject;
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}
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#pragma warning restore 618
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}
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}
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#pragma warning disable 618 // Using deprecated property to help with backwards compatibility.
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else if (GestureTouchesUtility.RaycastFromCamera(startPosition2, recognizer.xrOrigin, recognizer.arSessionOrigin, out var hit2, recognizer.raycastMask, recognizer.raycastTriggerInteraction))
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#pragma warning restore 618
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{
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var gameObject = hit2.transform.gameObject;
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var grabInteractable = gameObject.GetComponentInParent<XRGrabInteractable>();
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if (grabInteractable != null)
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{
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var interactableObject = grabInteractable.gameObject;
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if (interactableObject != null)
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targetObject = interactableObject;
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}
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else
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{
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#pragma warning disable 618
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var baseGestureInteractable = gameObject.GetComponentInParent<ARBaseGestureInteractable>();
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if (baseGestureInteractable != null)
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{
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var interactableObject = baseGestureInteractable.gameObject;
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if (interactableObject != null)
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targetObject = interactableObject;
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}
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#pragma warning restore 618
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}
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}
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GestureTouchesUtility.TryFindTouch(fingerId1, out var touch1);
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GestureTouchesUtility.TryFindTouch(fingerId2, out var touch2);
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position = (touch1.position + touch2.position) / 2;
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}
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/// <inheritdoc />
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protected internal override bool UpdateGesture()
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{
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var foundTouches = GestureTouchesUtility.TryFindTouch(fingerId1, out var touch1);
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foundTouches =
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GestureTouchesUtility.TryFindTouch(fingerId2, out var touch2) && foundTouches;
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if (!foundTouches)
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{
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Cancel();
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return false;
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}
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if (touch1.isPhaseCanceled || touch2.isPhaseCanceled)
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{
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Cancel();
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return false;
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}
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if (touch1.isPhaseEnded || touch2.isPhaseEnded)
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{
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Complete();
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return false;
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}
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if (touch1.isPhaseMoved || touch2.isPhaseMoved)
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{
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delta = ((touch1.position + touch2.position) / 2) - position;
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position = (touch1.position + touch2.position) / 2;
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return true;
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}
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return false;
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}
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/// <inheritdoc />
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protected internal override void OnCancel()
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{
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}
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/// <inheritdoc />
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protected internal override void OnFinish()
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{
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GestureTouchesUtility.ReleaseFingerId(fingerId1);
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GestureTouchesUtility.ReleaseFingerId(fingerId2);
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}
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}
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}
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#endif
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