Example usage for android.widget TextView setHorizontalFadingEdgeEnabled

Introduction

In this page you can find the example usage for android.widget TextView setHorizontalFadingEdgeEnabled.

Prototype

public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) 

Source Link

Document

Define whether the horizontal edges should be faded when this view is scrolled horizontally.

Usage

From source file:com.android.app.MediaPlaybackActivity.java

public boolean onTouch(View v, MotionEvent event) {
    int action = event.getAction();
    TextView tv = textViewForContainer(v);
    if (tv == null) {
        return false;
    }//  w  ww .j a  v  a2 s  .c  o  m
    if (action == MotionEvent.ACTION_DOWN) {
        v.setBackgroundColor(0xff606060);
        mInitialX = mLastX = (int) event.getX();
        mDraggingLabel = false;
    } else if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_CANCEL) {
        v.setBackgroundColor(0);
        if (mDraggingLabel) {
            Message msg = mLabelScroller.obtainMessage(0, tv);
            mLabelScroller.sendMessageDelayed(msg, 1000);
        }
    } else if (action == MotionEvent.ACTION_MOVE) {
        if (mDraggingLabel) {
            int scrollx = tv.getScrollX();
            int x = (int) event.getX();
            int delta = mLastX - x;
            if (delta != 0) {
                mLastX = x;
                scrollx += delta;
                if (scrollx > mTextWidth) {
                    // scrolled the text completely off the view to the left
                    scrollx -= mTextWidth;
                    scrollx -= mViewWidth;
                }
                if (scrollx < -mViewWidth) {
                    // scrolled the text completely off the view to the right
                    scrollx += mViewWidth;
                    scrollx += mTextWidth;
                }
                tv.scrollTo(scrollx, 0);
            }
            return true;
        }
        int delta = mInitialX - (int) event.getX();
        if (Math.abs(delta) > mTouchSlop) {
            // start moving
            mLabelScroller.removeMessages(0, tv);

            // Only turn ellipsizing off when it's not already off, because it
            // causes the scroll position to be reset to 0.
            if (tv.getEllipsize() != null) {
                tv.setEllipsize(null);
            }
            Layout ll = tv.getLayout();
            // layout might be null if the text just changed, or ellipsizing
            // was just turned off
            if (ll == null) {
                return false;
            }
            // get the non-ellipsized line width, to determine whether scrolling
            // should even be allowed
            mTextWidth = (int) tv.getLayout().getLineWidth(0);
            mViewWidth = tv.getWidth();
            if (mViewWidth > mTextWidth) {
                tv.setEllipsize(TruncateAt.END);
                v.cancelLongPress();
                return false;
            }
            mDraggingLabel = true;
            tv.setHorizontalFadingEdgeEnabled(true);
            v.cancelLongPress();
            return true;
        }
    }
    return false;
}

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