/*
- * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include <dali/internal/accessibility/common/accessibility-gesture-detector.h>
// EXTERNAL INCLUDES
-#include <dali/integration-api/events/gesture-requests.h>
+#include <cmath>
+
+#include <dali/public-api/events/touch-point.h>
+
+#include <dali/integration-api/events/touch-event-integ.h>
+
namespace Dali
{
namespace Adaptor
{
+namespace
+{
+ const float MINIMUM_MOTION_DISTANCE_BEFORE_PAN( 15.0f );
+ const float MINIMUM_MOTION_DISTANCE_BEFORE_PAN_SQUARED( MINIMUM_MOTION_DISTANCE_BEFORE_PAN * MINIMUM_MOTION_DISTANCE_BEFORE_PAN );
+ const float MINIMUM_MOTION_DISTANCE_TO_THRESHOLD_ADJUSTMENTS_RATIO( 2.0f / 3.0f );
+ const unsigned long MAXIMUM_TIME_DIFF_ALLOWED( 500 );
+ const unsigned long MINIMUM_TIME_BEFORE_THRESHOLD_ADJUSTMENTS( 100 );
+ const unsigned int MINIMUM_MOTION_EVENTS_BEFORE_PAN(2);
+ const unsigned int MINIMUM_TOUCHES_BEFORE_PAN(1);
+ const unsigned int MAXIMUM_TOUCHES_BEFORE_PAN(1);
+} // unnamed namespace
+
+
AccessibilityGestureDetector::AccessibilityGestureDetector()
-: PanGestureDetectorBase(Vector2::ZERO, Integration::PanGestureRequest(), NULL),
- mGestureHandler(NULL),
- mPanning(false)
+: mState( Clear ),
+ mScene(nullptr),
+ mGestureHandler(nullptr),
+ mPanning(false),
+ mThresholdAdjustmentsRemaining( 0 ),
+ mThresholdTotalAdjustments( MINIMUM_MOTION_DISTANCE_BEFORE_PAN * MINIMUM_MOTION_DISTANCE_TO_THRESHOLD_ADJUSTMENTS_RATIO ),
+ mPrimaryTouchDownTime( 0 ),
+ mMinimumTouchesRequired( MINIMUM_TOUCHES_BEFORE_PAN ),
+ mMaximumTouchesRequired( MAXIMUM_TOUCHES_BEFORE_PAN ),
+ mMinimumDistanceSquared( MINIMUM_MOTION_DISTANCE_BEFORE_PAN_SQUARED ),
+ mMinimumMotionEvents( MINIMUM_MOTION_EVENTS_BEFORE_PAN ),
+ mMotionEvents( 0 )
{
}
mGestureHandler = &handler;
}
-void AccessibilityGestureDetector::EmitPan(const Integration::PanGestureEvent gesture)
+void AccessibilityGestureDetector::EmitPan(const AccessibilityGestureEvent gesture)
{
if( mGestureHandler )
{
- if(gesture.state == Gesture::Started)
+ if(gesture.state == AccessibilityGestureEvent::Started)
{
mPanning = true;
}
{
mGestureHandler->HandlePanGesture(gesture);
- if( (gesture.state == Gesture::Finished) ||
- (gesture.state == Gesture::Cancelled) )
+ if( (gesture.state == AccessibilityGestureEvent::Finished) ||
+ (gesture.state == AccessibilityGestureEvent::Cancelled) )
{
mPanning = false;
}
}
}
+void AccessibilityGestureDetector::SendEvent(const Integration::TouchEvent& event)
+{
+ PointState::Type primaryPointState(event.points[0].GetState());
+
+ if (primaryPointState == PointState::INTERRUPTED)
+ {
+ if ( ( mState == Started ) || ( mState == Possible ) )
+ {
+ // If our pan had started and we are interrupted, then tell Core that pan is cancelled.
+ mTouchEvents.push_back(event);
+ SendPan(AccessibilityGestureEvent::Cancelled, event);
+ }
+ mState = Clear; // We should change our state to Clear.
+ mTouchEvents.clear();
+ }
+ else
+ {
+ switch (mState)
+ {
+ case Clear:
+ {
+ if ( ( primaryPointState == PointState::DOWN ) || ( primaryPointState == PointState::STATIONARY ) )
+ {
+ mPrimaryTouchDownLocation = event.points[0].GetScreenPosition();
+ mPrimaryTouchDownTime = event.time;
+ mMotionEvents = 0;
+ if (event.GetPointCount() == mMinimumTouchesRequired)
+ {
+ // We have satisfied the minimum touches required for a pan, tell core that a gesture may be possible and change our state accordingly.
+ mState = Possible;
+ SendPan(AccessibilityGestureEvent::Possible, event);
+ }
+
+ mTouchEvents.push_back(event);
+ }
+ break;
+ }
+
+ case Possible:
+ {
+ unsigned int pointCount(event.GetPointCount());
+ if ( (pointCount >= mMinimumTouchesRequired)&&(pointCount <= mMaximumTouchesRequired) )
+ {
+ if (primaryPointState == PointState::MOTION)
+ {
+ mTouchEvents.push_back(event);
+ mMotionEvents++;
+
+ Vector2 delta(event.points[0].GetScreenPosition() - mPrimaryTouchDownLocation);
+
+ if ( ( mMotionEvents >= mMinimumMotionEvents ) &&
+ ( delta.LengthSquared() >= static_cast<float>( mMinimumDistanceSquared ) ) )
+ {
+ // If the touch point(s) have moved enough distance to be considered a pan, then tell Core that the pan gesture has started and change our state accordingly.
+ mState = Started;
+ SendPan(AccessibilityGestureEvent::Started, event);
+ }
+ }
+ else if (primaryPointState == PointState::UP)
+ {
+ Vector2 delta(event.points[0].GetScreenPosition() - mPrimaryTouchDownLocation);
+ if (delta.LengthSquared() >= static_cast<float>( mMinimumDistanceSquared ) )
+ {
+ SendPan(AccessibilityGestureEvent::Started, event);
+ mTouchEvents.push_back(event);
+ SendPan(AccessibilityGestureEvent::Finished, event);
+ }
+ else
+ {
+ // If we have lifted the primary touch point then tell core the pan is cancelled and change our state to Clear.
+ SendPan(AccessibilityGestureEvent::Cancelled, event);
+ }
+ mState = Clear;
+ mTouchEvents.clear();
+ }
+ }
+ else
+ {
+ // We do not satisfy pan conditions, tell Core our Gesture has been cancelled.
+ SendPan(AccessibilityGestureEvent::Cancelled, event);
+
+ if (pointCount == 1 && primaryPointState == PointState::UP)
+ {
+ // If we have lifted the primary touch point, then change our state to Clear...
+ mState = Clear;
+ mTouchEvents.clear();
+ }
+ else
+ {
+ // ...otherwise change it to Failed.
+ mState = Failed;
+ }
+ }
+ break;
+ }
+
+ case Started:
+ {
+ mTouchEvents.push_back(event);
+
+ unsigned int pointCount(event.GetPointCount());
+ if ( (pointCount >= mMinimumTouchesRequired)&&(pointCount <= mMaximumTouchesRequired) )
+ {
+ switch (primaryPointState)
+ {
+ case PointState::MOTION:
+ // Pan is continuing, tell Core.
+ SendPan(AccessibilityGestureEvent::Continuing, event);
+ break;
+
+ case PointState::UP:
+ // Pan is finally finished when our primary point is lifted, tell Core and change our state to Clear.
+ SendPan(AccessibilityGestureEvent::Finished, event);
+ mState = Clear;
+ mTouchEvents.clear();
+ break;
+
+ case PointState::STATIONARY:
+ if (pointCount == mMinimumTouchesRequired)
+ {
+ Integration::PointContainerConstIterator iter = event.points.begin() + 1; // We already know the state of the first point
+ for(; iter != event.points.end(); ++iter)
+ {
+ if(iter->GetState() == PointState::UP)
+ {
+ // The number of touch points will be less than the minimum required. Inform core and change our state to Finished.
+ SendPan(AccessibilityGestureEvent::Finished, event);
+ mState = Finished;
+ break;
+ }
+ }
+ }
+ break;
+
+ default:
+ break;
+ }
+ }
+ else
+ {
+ // We have gone outside of the pan requirements, inform Core that the gesture is finished.
+ SendPan(AccessibilityGestureEvent::Finished, event);
+
+ if (pointCount == 1 && primaryPointState == PointState::UP)
+ {
+ // If this was the primary point being released, then we change our state back to Clear...
+ mState = Clear;
+ mTouchEvents.clear();
+ }
+ else
+ {
+ // ...otherwise we change it to Finished.
+ mState = Finished;
+ }
+ }
+ break;
+ }
+
+ case Finished:
+ case Failed:
+ {
+ if (primaryPointState == PointState::UP)
+ {
+ // Change our state back to clear when the primary touch point is released.
+ mState = Clear;
+ mTouchEvents.clear();
+ }
+ break;
+ }
+ }
+ }
+}
+
+void AccessibilityGestureDetector::SendPan(AccessibilityGestureEvent::State state, const Integration::TouchEvent& currentEvent)
+{
+ AccessibilityGestureEvent gesture(state);
+ gesture.currentPosition = currentEvent.points[0].GetScreenPosition();
+ gesture.numberOfTouches = currentEvent.GetPointCount();
+
+ if ( mTouchEvents.size() > 1 )
+ {
+ // Get the second last event in the queue, the last one is the current event
+ const Integration::TouchEvent& previousEvent( *( mTouchEvents.rbegin() + 1 ) );
+
+ Vector2 previousPosition( mPreviousPosition );
+ uint32_t previousTime( previousEvent.time );
+
+ // If we've just started then we want to remove the threshold from Core calculations.
+ if ( state == AccessibilityGestureEvent::Started )
+ {
+ previousPosition = mPrimaryTouchDownLocation;
+ previousTime = mPrimaryTouchDownTime;
+
+ // If it's a slow pan, we do not want to phase in the threshold over the first few pan-events
+ // A slow pan is defined as one that starts the specified number of milliseconds after the down-event
+ if ( ( currentEvent.time - previousTime ) > MINIMUM_TIME_BEFORE_THRESHOLD_ADJUSTMENTS )
+ {
+ mThresholdAdjustmentsRemaining = mThresholdTotalAdjustments;
+ mThresholdAdjustmentPerFrame = ( gesture.currentPosition - previousPosition ) / static_cast<float>( mThresholdTotalAdjustments );
+ }
+ else
+ {
+ mThresholdAdjustmentsRemaining = 0;
+ mThresholdAdjustmentPerFrame = Vector2::ZERO;
+ }
+ }
+
+ gesture.previousPosition = previousPosition;
+ gesture.timeDelta = currentEvent.time - previousTime;
+
+ // Apply the threshold with a phased approach
+ if ( mThresholdAdjustmentsRemaining > 0 )
+ {
+ --mThresholdAdjustmentsRemaining;
+ gesture.currentPosition -= mThresholdAdjustmentPerFrame * static_cast<float>( mThresholdAdjustmentsRemaining );
+ }
+
+ mPreviousPosition = gesture.currentPosition;
+ }
+ else
+ {
+ gesture.previousPosition = gesture.currentPosition;
+ gesture.timeDelta = 0;
+ }
+
+ gesture.time = currentEvent.time;
+
+ EmitPan(gesture);
+}
+
} // namespace Adaptor
} // namespace Internal
projects / platform / core / uifw / dali-adaptor.git / blobdiff