improve bounds checking at gif view
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494745c10f
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@ -34,6 +34,7 @@ class MyZoomableGifTextureView(context: Context, attrs: AttributeSet) : GifTextu
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private val mMatrix = Matrix()
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private var mOrigRect = RectF()
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private var mWantedRect = RectF()
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private var mCurrentViewport = RectF()
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init {
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mScaleDetector = ScaleGestureDetector(context, ScaleListener())
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@ -57,20 +58,21 @@ class MyZoomableGifTextureView(context: Context, attrs: AttributeSet) : GifTextu
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mOrigRect = RectF(0f, 0f, mGifWidth, mGifHeight)
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mWantedRect = RectF(0f, 0f, mScreenWidth, mScreenHeight)
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mMatrix.setRectToRect(mOrigRect, mWantedRect, Matrix.ScaleToFit.CENTER)
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mMatrix.getValues(mMatrices)
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val left = mMatrices[Matrix.MTRANS_X]
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val top = mMatrices[Matrix.MTRANS_Y]
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val right = mScreenWidth - left
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val bottom = mScreenHeight - top
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mCurrentViewport.set(left, top, right, bottom)
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setTransform(mMatrix)
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invalidate()
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beVisible()
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}
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override fun onTouchEvent(event: MotionEvent): Boolean {
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mScaleDetector?.onTouchEvent(event)
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mMatrix.getValues(mMatrices)
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mMatrix.setRectToRect(mOrigRect, mWantedRect, Matrix.ScaleToFit.CENTER)
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mMatrix.postScale(mSaveScale, mSaveScale, mLastFocusX, mLastFocusY)
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val x = mMatrices[Matrix.MTRANS_X]
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val y = mMatrices[Matrix.MTRANS_Y]
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// mScaleDetector?.onTouchEvent(event)
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when (event.actionMasked) {
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MotionEvent.ACTION_DOWN -> {
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@ -97,19 +99,33 @@ class MyZoomableGifTextureView(context: Context, attrs: AttributeSet) : GifTextu
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if (mCurrZoomMode == ZOOM_MODE_ZOOM || mCurrZoomMode == ZOOM_MODE_DRAG && mSaveScale > MIN_VIDEO_ZOOM_SCALE) {
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var diffX = event.x - mLastTouchX
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var diffY = event.y - mLastTouchY
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if (y + diffY > 0) {
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diffY = -y
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} else if (y + diffY < -mBottom) {
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diffY = -(y + mBottom)
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// horizontal bounds
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if (mCurrentViewport.left + diffX < 0) {
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diffX = -mCurrentViewport.left
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} else if (mCurrentViewport.right + diffX > mScreenWidth) {
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diffX = mScreenWidth - mCurrentViewport.right
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}
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if (x + diffX > 0) {
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diffX = -x
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} else if (x + diffX < -mRight) {
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diffX = -(x + mRight)
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// vertical bounds
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if (mCurrentViewport.top + diffY < 0) {
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diffY = -mCurrentViewport.top
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} else if (mCurrentViewport.bottom + diffY > mScreenHeight) {
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diffY = mScreenHeight - mCurrentViewport.bottom
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}
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mCurrentViewport.left += diffX
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mCurrentViewport.right += diffX
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mCurrentViewport.top += diffY
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mCurrentViewport.bottom += diffY
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mMatrix.postTranslate(diffX, diffY)
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mCurrentViewport.left = Math.max(mCurrentViewport.left, 0f)
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mCurrentViewport.right = Math.min(mCurrentViewport.right, mScreenWidth)
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mCurrentViewport.top = Math.max(mCurrentViewport.top, 0f)
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mCurrentViewport.bottom = Math.min(mCurrentViewport.bottom, mScreenHeight)
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mLastTouchX = event.x
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mLastTouchY = event.y
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}
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