@Override
public void onDrag(float dx, float dy) {
if (mScaleDragDetector.isScaling()) {
return; // Do not drag if we are already scaling
}
if (DEBUG) {
LogManager.getLogger().d(LOG_TAG, String.format("onDrag: dx: %.2f. dy: %.2f", dx, dy));
}
ImageView imageView = getImageView();
mSuppMatrix.postTranslate(dx, dy);
checkAndDisplayMatrix();
/**
* Here we decide whether to let the ImageView's parent to start taking over the touch event.
*
* <p>First we check whether this function is enabled. We never want the parent to take over if
* we're scaling. We then check the edge we're on, and the direction of the scroll (i.e. if
* we're pulling against the edge, aka 'overscrolling', let the parent take over).
*/
ViewParent parent = imageView.getParent();
if (mAllowParentInterceptOnEdge && !mScaleDragDetector.isScaling()) {
if (mScrollEdge == EDGE_BOTH
|| (mScrollEdge == EDGE_LEFT && dx >= 1f)
|| (mScrollEdge == EDGE_RIGHT && dx <= -1f)) {
if (null != parent) parent.requestDisallowInterceptTouchEvent(false);
}
} else {
if (null != parent) {
parent.requestDisallowInterceptTouchEvent(true);
}
}
}
@Override
public void onScale(float scaleFactor, float focusX, float focusY) {
if (DEBUG) {
LogManager.getLogger()
.d(
LOG_TAG,
String.format(
"onScale: scale: %.2f. fX: %.2f. fY: %.2f", scaleFactor, focusX, focusY));
}
if (getScale() < mMaxScale || scaleFactor < 1f) {
mSuppMatrix.postScale(scaleFactor, scaleFactor, focusX, focusY);
checkAndDisplayMatrix();
}
}
public void fling(int viewWidth, int viewHeight, int velocityX, int velocityY) {
final RectF rect = getDisplayRect();
if (null == rect) {
return;
}
final int startX = Math.round(-rect.left);
final int minX, maxX, minY, maxY;
if (viewWidth < rect.width()) {
minX = 0;
maxX = Math.round(rect.width() - viewWidth);
} else {
minX = maxX = startX;
}
final int startY = Math.round(-rect.top);
if (viewHeight < rect.height()) {
minY = 0;
maxY = Math.round(rect.height() - viewHeight);
} else {
minY = maxY = startY;
}
mCurrentX = startX;
mCurrentY = startY;
if (DEBUG) {
LogManager.getLogger()
.d(
LOG_TAG,
"fling. StartX:"
+ startX
+ " StartY:"
+ startY
+ " MaxX:"
+ maxX
+ " MaxY:"
+ maxY);
}
// If we actually can move, fling the scroller
if (startX != maxX || startY != maxY) {
mScroller.fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY, 0, 0);
}
}
@Override
public void setScale(float scale, float focalX, float focalY, boolean animate) {
ImageView imageView = getImageView();
if (null != imageView) {
// Check to see if the scale is within bounds
if (scale < mMinScale || scale > mMaxScale) {
LogManager.getLogger()
.i(LOG_TAG, "Scale must be within the range of minScale and maxScale");
return;
}
if (animate) {
imageView.post(new AnimatedZoomRunnable(getScale(), scale, focalX, focalY));
} else {
mSuppMatrix.setScale(scale, scale, focalX, focalY);
checkAndDisplayMatrix();
}
}
}
@Override
public void onFling(float startX, float startY, float velocityX, float velocityY) {
if (DEBUG) {
LogManager.getLogger()
.d(
LOG_TAG,
"onFling. sX: "
+ startX
+ " sY: "
+ startY
+ " Vx: "
+ velocityX
+ " Vy: "
+ velocityY);
}
ImageView imageView = getImageView();
mCurrentFlingRunnable = new FlingRunnable(imageView.getContext());
mCurrentFlingRunnable.fling(
getImageViewWidth(imageView),
getImageViewHeight(imageView),
(int) velocityX,
(int) velocityY);
imageView.post(mCurrentFlingRunnable);
}
@Override
public void run() {
if (mScroller.isFinished()) {
return; // remaining post that should not be handled
}
ImageView imageView = getImageView();
if (null != imageView && mScroller.computeScrollOffset()) {
final int newX = mScroller.getCurrX();
final int newY = mScroller.getCurrY();
if (DEBUG) {
LogManager.getLogger()
.d(
LOG_TAG,
"fling run(). CurrentX:"
+ mCurrentX
+ " CurrentY:"
+ mCurrentY
+ " NewX:"
+ newX
+ " NewY:"
+ newY);
}
mSuppMatrix.postTranslate(mCurrentX - newX, mCurrentY - newY);
setImageViewMatrix(getDrawMatrix());
mCurrentX = newX;
mCurrentY = newY;
// Post On animation
Compat.postOnAnimation(imageView, this);
}
}
public void cancelFling() {
if (DEBUG) {
LogManager.getLogger().d(LOG_TAG, "Cancel Fling");
}
mScroller.forceFinished(true);
}