Mattia Iavarone
7 years ago
parent
455e3522e9
commit
9d9e93e67d
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package com.otaliastudios.cameraview; |
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import android.animation.Animator; |
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import android.animation.AnimatorListenerAdapter; |
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import android.content.Context; |
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import android.graphics.PointF; |
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import android.util.Log; |
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import android.view.GestureDetector; |
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import android.view.LayoutInflater; |
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import android.view.MotionEvent; |
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import android.view.View; |
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import android.widget.FrameLayout; |
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import android.widget.ImageView; |
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class ScrollGestureLayout extends GestureLayout { |
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private GestureDetector mDetector; |
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private boolean mNotify; |
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private float mDistance; |
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public ScrollGestureLayout(Context context) { |
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super(context); |
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} |
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@Override |
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protected void onInitialize(Context context) { |
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super.onInitialize(context); |
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mPoints = new PointF[]{ new PointF(0, 0), new PointF(0, 0) }; |
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mDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { |
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@Override |
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public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { |
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boolean horizontal; |
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Log.e("ScrollGestureLayout", "onScroll, distanceX="+distanceX+", distanceY="+distanceY); |
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if (e1.getX() != mPoints[0].x || e1.getY() != mPoints[0].y) { |
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// First step. We choose now if it's a vertical or horizontal scroll, and
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// stick to it for the whole gesture.
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horizontal = Math.abs(distanceX) >= Math.abs(distanceY); |
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mType = horizontal ? Gesture.SCROLL_HORIZONTAL : Gesture.SCROLL_VERTICAL; |
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mPoints[0].set(e1.getX(), e1.getY()); |
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} else { |
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// Not the first step. We already defined the type.
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horizontal = mType == Gesture.SCROLL_HORIZONTAL; |
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} |
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mPoints[1].set(e2.getX(), e2.getY()); |
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mDistance = horizontal ? (distanceX / getWidth()) : (distanceY / getHeight()); |
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mDistance = -mDistance; // they are provided inverted.
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mNotify = true; |
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return true; |
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} |
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}); |
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mDetector.setIsLongpressEnabled(false); // Looks important.
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} |
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@Override |
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public boolean onTouchEvent(MotionEvent event) { |
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if (!mEnabled) return false; |
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// Reset the mNotify flag on a new gesture.
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// This is to ensure that the mNotify flag stays on until the
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// previous gesture ends.
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if (event.getAction() == MotionEvent.ACTION_DOWN) { |
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mNotify = false; |
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} |
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// Let's see if we detect something.
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mDetector.onTouchEvent(event); |
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// Keep notifying CameraView as long as the gesture goes.
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if (mNotify) Log.e("ScrollGestureLayout", "notifying a gesture "+mType.name()); |
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return mNotify; |
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} |
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@Override |
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public float scaleValue(float currValue, float minValue, float maxValue) { |
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float delta = mDistance; // -1 ... 1
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// ^ This works well if minValue = 0, maxValue = 1.
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// Account for the different range:
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delta *= (maxValue - minValue); // -(max-min) ... (max-min)
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// Add some sensitivity.
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delta *= 2; |
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// Cap
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float newValue = currValue + delta; |
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if (newValue < minValue) newValue = minValue; |
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if (newValue > maxValue) newValue = maxValue; |
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Log.e("ScrollGestureLayout", "curr="+currValue+", min="+minValue+", max="+maxValue+", out="+newValue); |
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return newValue; |
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} |
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} |
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