Removed unused ToggleScrollView
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cketti
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5041a2c832
commit
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1 changed files with 0 additions and 143 deletions
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@ -1,143 +0,0 @@
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package com.fsck.k9.view;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.util.Log;
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import android.view.GestureDetector;
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import android.view.MotionEvent;
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import android.widget.ScrollView;
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import com.fsck.k9.K9;
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import com.fsck.k9.controller.MessagingListener;
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/**
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* An extension of {@link ScrollView} that allows scrolling to be selectively disabled.
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*/
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public class ToggleScrollView extends ScrollView {
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private GestureDetector mDetector;
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private boolean mScrolling = true;
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private int mCurrentYPosition;
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private double mScrollPercentage;
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private ScrollToLastLocationListener mListener;
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public ToggleScrollView(Context context, AttributeSet attrs) {
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super(context, attrs);
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mDetector = new GestureDetector(new YScrollDetector());
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}
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public void setScrolling(boolean enable) {
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mScrolling = enable;
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}
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@Override
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public boolean onTouchEvent(MotionEvent ev) {
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return (mScrolling) ? super.onTouchEvent(ev) : true;
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent ev) {
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if (!mScrolling) {
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return false;
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}
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// This doesn't quite get us to diagonal scrolling, but it's somewhat better than what we've
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// currently got. This is based on
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// http://stackoverflow.com/questions/2646028/android-horizontalscrollview-within-scrollview-touch-handling
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boolean result = super.onInterceptTouchEvent(ev);
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// Let the original ScrollView handle ACTION_DOWN so we can stop the scroll when someone touches the screen.
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if (ev.getAction() == MotionEvent.ACTION_DOWN || mDetector.onTouchEvent(ev)) {
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return result;
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}
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return false;
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}
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// Return false if we're scrolling in the x direction. That is, decline to consume the event and
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// let the parent class take a stab at it.
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class YScrollDetector extends 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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try {
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if (Math.abs(distanceY) > Math.abs(distanceX)) {
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return true;
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} else {
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return false;
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}
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} catch (Exception e) {
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// nothing
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}
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return false;
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}
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}
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/**
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* Fetch the current percentage by which this view has been scrolled.
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* @return Scroll percentage based on the top edge of the screen, from 0 to 100. This number should never really
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* be 100, unless the screen is of 0 height...
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*/
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public double getScrollPercentage() {
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// We save only the Y coordinate instead of the percentage because I don't know how expensive the
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// computeVerticalScrollRange() call is.
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final int scrollRange = computeVerticalScrollRange();
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if(scrollRange == 0) {
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return 0;
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}
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return (double) mCurrentYPosition / scrollRange;
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}
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/**
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* Set the percentage by which we should scroll the page once we get the load complete event. This is
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* based on the top edge of the view.
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* @param percentage Percentage of page to scroll to.
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*/
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public void setScrollPercentage(final double percentage) {
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Log.d(K9.LOG_TAG, "ToggleView: Setting last scroll percentage to " + percentage);
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this.mScrollPercentage = percentage;
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}
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/**
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* Override {@link ScrollView#onScrollChanged(int, int, int, int)} to record the current x/y position. We use this
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* to save our current position for future scrolling.
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*
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* @param x
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* @param y
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* @param oldx
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* @param oldy
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*/
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@Override
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protected void onScrollChanged(int x, int y, int oldx, int oldy) {
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super.onScrollChanged(x, y, oldx, oldy);
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this.mCurrentYPosition = y;
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// I wish Android has a TRACE log level so I wouldn't have to comment this out. This one is really noisy.
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// Log.d(K9.LOG_TAG, "ToggleScrollView: mCurrentYPosition=" + y + " scrollRange=" + computeVerticalScrollRange() + " pct=" + getScrollPercentage());
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}
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/**
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* This is a {@link MessagingListener} which listens for when the a message has finished being displayed on the
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* screen. We'll scroll the message to the user's last known location once it's done.
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*/
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class ScrollToLastLocationListener extends MessagingListener {
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public void messageViewFinished() {
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// Don't scroll if our last position was at the top.
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if(mScrollPercentage != 0.0) {
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final int scrollRange = computeVerticalScrollRange();
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final int newY = (int)(mScrollPercentage * scrollRange);
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Log.d(K9.LOG_TAG, "ToggleScrollView: requested " + (100 * mScrollPercentage) + "%, " +
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"scrolling to " + newY + "/" + scrollRange);
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scrollTo(0, newY);
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}
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}
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}
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/**
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* Fetch the {@link MessagingListener} for this <code>ScrollView</code>.
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* @return
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*/
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public MessagingListener getListener() {
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if(this.mListener != null) {
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return this.mListener;
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} else {
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return this.mListener = new ScrollToLastLocationListener();
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}
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}
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}
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