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improve bounds checking at gif view

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This commit is contained in:
tibbi 2019-01-16 14:02:21 +01:00
parent 494745c10f
commit 0e68d01f08
1 changed files with 32 additions and 16 deletions
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48
app/src/main/kotlin/com/simplemobiletools/gallery/pro/views/MyZoomableGifTextureView.kt
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@ -34,6 +34,7 @@ class MyZoomableGifTextureView(context: Context, attrs: AttributeSet) : GifTextu
private val mMatrix = Matrix()
private var mOrigRect = RectF()
private var mWantedRect = RectF()
private var mCurrentViewport = RectF()
init {
mScaleDetector = ScaleGestureDetector(context, ScaleListener())
@ -57,20 +58,21 @@ class MyZoomableGifTextureView(context: Context, attrs: AttributeSet) : GifTextu
mOrigRect = RectF(0f, 0f, mGifWidth, mGifHeight)
mWantedRect = RectF(0f, 0f, mScreenWidth, mScreenHeight)
mMatrix.setRectToRect(mOrigRect, mWantedRect, Matrix.ScaleToFit.CENTER)
mMatrix.getValues(mMatrices)
val left = mMatrices[Matrix.MTRANS_X]
val top = mMatrices[Matrix.MTRANS_Y]
val right = mScreenWidth - left
val bottom = mScreenHeight - top
mCurrentViewport.set(left, top, right, bottom)
setTransform(mMatrix)
invalidate()
beVisible()
}
override fun onTouchEvent(event: MotionEvent): Boolean {
mScaleDetector?.onTouchEvent(event)
mMatrix.getValues(mMatrices)
mMatrix.setRectToRect(mOrigRect, mWantedRect, Matrix.ScaleToFit.CENTER)
mMatrix.postScale(mSaveScale, mSaveScale, mLastFocusX, mLastFocusY)
val x = mMatrices[Matrix.MTRANS_X]
val y = mMatrices[Matrix.MTRANS_Y]
// mScaleDetector?.onTouchEvent(event)
when (event.actionMasked) {
MotionEvent.ACTION_DOWN -> {
@ -97,19 +99,33 @@ class MyZoomableGifTextureView(context: Context, attrs: AttributeSet) : GifTextu
if (mCurrZoomMode == ZOOM_MODE_ZOOM || mCurrZoomMode == ZOOM_MODE_DRAG && mSaveScale > MIN_VIDEO_ZOOM_SCALE) {
var diffX = event.x - mLastTouchX
var diffY = event.y - mLastTouchY
if (y + diffY > 0) {
diffY = -y
} else if (y + diffY < -mBottom) {
diffY = -(y + mBottom)
// horizontal bounds
if (mCurrentViewport.left + diffX < 0) {
diffX = -mCurrentViewport.left
} else if (mCurrentViewport.right + diffX > mScreenWidth) {
diffX = mScreenWidth - mCurrentViewport.right
}
if (x + diffX > 0) {
diffX = -x
} else if (x + diffX < -mRight) {
diffX = -(x + mRight)
// vertical bounds
if (mCurrentViewport.top + diffY < 0) {
diffY = -mCurrentViewport.top
} else if (mCurrentViewport.bottom + diffY > mScreenHeight) {
diffY = mScreenHeight - mCurrentViewport.bottom
}
mCurrentViewport.left += diffX
mCurrentViewport.right += diffX
mCurrentViewport.top += diffY
mCurrentViewport.bottom += diffY
mMatrix.postTranslate(diffX, diffY)
mCurrentViewport.left = Math.max(mCurrentViewport.left, 0f)
mCurrentViewport.right = Math.min(mCurrentViewport.right, mScreenWidth)
mCurrentViewport.top = Math.max(mCurrentViewport.top, 0f)
mCurrentViewport.bottom = Math.min(mCurrentViewport.bottom, mScreenHeight)
mLastTouchX = event.x
mLastTouchY = event.y
}