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fixing some multitouch gesture related glitches

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This commit is contained in:
tibbi 2022-02-23 22:15:44 +01:00
parent 4223488b65
commit 18555d4a5e
1 changed files with 25 additions and 12 deletions
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37
app/src/main/kotlin/com/simplemobiletools/draw/pro/views/MyCanvas.kt
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@ -56,6 +56,8 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
private var mAllowMovingZooming = true
private var mIsEraserOn = false
private var mWasMultitouch = false
private var mIgnoreTouches = false
private var mWasScalingInGesture = false
private var mBackgroundColor = 0
private var mCenter: PointF? = null
@ -103,6 +105,16 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
}
val action = event.actionMasked
if (mIgnoreTouches && action == MotionEvent.ACTION_UP) {
mIgnoreTouches = false
mWasScalingInGesture = false
return true
}
if (mIgnoreTouches) {
return true
}
if (action == MotionEvent.ACTION_DOWN || action == MotionEvent.ACTION_MOVE) {
mActivePointerId = event.getPointerId(0)
}
@ -130,6 +142,7 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
when (action) {
MotionEvent.ACTION_DOWN -> {
mWasScalingInGesture = false
mWasMultitouch = false
mStartX = x
mStartY = y
@ -160,25 +173,19 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
}
MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
mActivePointerId = INVALID_POINTER_ID
actionUp()
actionUp(false)
mWasScalingInGesture = false
}
MotionEvent.ACTION_POINTER_DOWN -> {
mWasMultitouch = true
mTouchSloppedBeforeMultitouch = mLastMotionEvent.isTouchSlop(pointerIndex, mStartX, mStartY)
}
MotionEvent.ACTION_POINTER_UP -> {
val upPointerIndex = event.actionIndex
val pointerId = event.getPointerId(upPointerIndex)
if (pointerId == mActivePointerId) {
val newPointerIndex = if (upPointerIndex == 0) 1 else 0
mLastTouchX = event.getX(newPointerIndex)
mLastTouchY = event.getY(newPointerIndex)
mActivePointerId = event.getPointerId(newPointerIndex)
}
mIgnoreTouches = true
actionUp(!mWasScalingInGesture)
}
}
mLastMotionEvent = MotionEvent.obtain(event)
invalidate()
@ -349,8 +356,8 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
mCurY = y
}
private fun actionUp() {
if (!mWasMultitouch) {
private fun actionUp(forceLineDraw: Boolean) {
if (!mWasMultitouch || forceLineDraw) {
mPath.lineTo(mCurX, mCurY)
// draw a dot on click
@ -390,6 +397,12 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
private inner class ScaleListener : ScaleGestureDetector.SimpleOnScaleGestureListener() {
override fun onScale(detector: ScaleGestureDetector): Boolean {
if (!mWasScalingInGesture) {
mPath.reset()
}
mIgnoreTouches = true
mWasScalingInGesture = true
mScaleFactor *= detector.scaleFactor
mScaleFactor = max(0.1f, min(mScaleFactor, 10.0f))
setBrushSize(mCurrBrushSize)