@Override public void onDrawableChanged(final Drawable drawable) { Log.v(LOG_TAG, "image scale: " + mImage.getScale() + "/" + mImage.getMinScale()); Log.v(LOG_TAG, "scale type: " + mImage.getDisplayType() + "/" + mImage.getScaleType()); } }
public boolean canScroll() { if (getScale() > 1) { return true; } RectF bitmapRect = getBitmapRect(); return !mViewPort.contains(bitmapRect); }
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { if (!canScroll()) { return false; } if (DEBUG) { Log.i(TAG, "onFling"); } if (Math.abs(velocityX) > (mMinFlingVelocity * 4) || Math.abs(velocityY) > (mMinFlingVelocity * 4)) { if (DEBUG) { Log.v(TAG, "velocity: " + velocityY); Log.v(TAG, "diff: " + (e2.getY() - e1.getY())); } final float scale = Math.min(Math.max(2f, getScale() / 2), 3.f); float scaledDistanceX = ((velocityX) / mMaxFlingVelocity) * (getWidth() * scale); float scaledDistanceY = ((velocityY) / mMaxFlingVelocity) * (getHeight() * scale); if (DEBUG) { Log.v(TAG, "scale: " + getScale() + ", scale_final: " + scale); Log.v(TAG, "scaledDistanceX: " + scaledDistanceX); Log.v(TAG, "scaledDistanceY: " + scaledDistanceY); } mUserScaled = true; double total = Math.sqrt(Math.pow(scaledDistanceX, 2) + Math.pow(scaledDistanceY, 2)); scrollBy(scaledDistanceX, scaledDistanceY, (long) Math.min(Math.max(300, total / 5), 800)); postInvalidate(); return true; } return false; }
public boolean onUp(MotionEvent e) { if (getBitmapChanged()) { return false; } if (getScale() < getMinScale()) { zoomTo(getMinScale(), 50); } return true; }
@Override public boolean onDoubleTap(MotionEvent e) { if (DEBUG) { Log.i(TAG, "onDoubleTap. double tap enabled? " + mDoubleTapEnabled); } if (mDoubleTapEnabled) { if (Build.VERSION.SDK_INT >= 19) { if (mScaleDetector.isQuickScaleEnabled()) { return true; } } mUserScaled = true; float scale = getScale(); float targetScale; targetScale = onDoubleTapPost(scale, getMaxScale(), getMinScale()); targetScale = Math.min(getMaxScale(), Math.max(targetScale, getMinScale())); zoomTo(targetScale, e.getX(), e.getY(), mDefaultAnimationDuration); } if (null != mDoubleTapListener) { mDoubleTapListener.onDoubleTap(); } return super.onDoubleTap(e); }
@Override public boolean onScale(ScaleGestureDetector detector) { float span = detector.getCurrentSpan() - detector.getPreviousSpan(); float targetScale = getScale() * detector.getScaleFactor(); if (mScaleEnabled) { if (mScaled && span != 0) { mUserScaled = true; targetScale = Math.min(getMaxScale(), Math.max(targetScale, getMinScale() - MIN_SCALE_DIFF)); zoomTo(targetScale, detector.getFocusX(), detector.getFocusY()); mDoubleTapDirection = 1; invalidate(); return true; } // This is to prevent a glitch the first time // image is scaled. if (!mScaled) { mScaled = true; } } return true; }
@Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { //if (!mScrollEnabled) return false; if (e1.getPointerCount() > 1 || e2.getPointerCount() > 1) return false; if (mScaleDetector.isInProgress()) return false; if (getScale() == 1f) return false; return ImageViewTouch.this.onFling(e1, e2, velocityX, velocityY); }
@Override public boolean onDoubleTapEvent(MotionEvent e) { if (mScaleModeAuto && e.getAction() == MotionEvent.ACTION_UP) { float targetScale = Math.min(getMaxScale(), Math.max(onDoubleTapPost(getScale()), getMinScale())); zoomTo(targetScale, e.getX(), e.getY(), DEFAULT_ANIMATION_DURATION); invalidate(); } mScaleModeAuto = true; return super.onDoubleTapEvent(e); }
public boolean onUp(MotionEvent e) { if (getBitmapChanged()) return false; if (getScale() < getMinScale()) { zoomTo(getMinScale(), 50); } return true; }
@Override public boolean onScale(ScaleGestureDetector detector) { float span = detector.getCurrentSpan() - detector.getPreviousSpan(); float targetScale = getScale() * detector.getScaleFactor(); if (mScaleEnabled) { mScaleModeAuto = false; if (mScaled && span != 0) { mUserScaled = true; targetScale = Math.min(getMaxScale(), Math.max(targetScale, getMinScale() - 0.1f)); zoomTo(targetScale, detector.getFocusX(), detector.getFocusY()); invalidate(); return true; } // This is to prevent a glitch the first time image is scaled. if (!mScaled) mScaled = true; } return true; } }