TOPIC:

public class CustomPdfLayoutView extends PDFLayoutView {
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        try {
            if(this.onTouchZoom(event)) {
                this.getParent().requestDisallowInterceptTouchEvent(true);
                return true;
            } else {
                boolean bOK = this.onTouchNone(event);
                this.getParent().requestDisallowInterceptTouchEvent(bOK);
                return bOK;
            }
        } catch (Exception var3) {
            return false;
        }
    }
}

private boolean onTouchNone(MotionEvent event)
	{
		if( m_status != STA_NONE ) return false;
		if( m_gesture.onTouchEvent(event) ) return true;
		switch(event.getActionMasked())
		{
		case MotionEvent.ACTION_DOWN:
            m_hold_x = event.getX();
            m_hold_y = event.getY();
            m_hold_docx = m_layout.vGetX();
            m_hold_docy = m_layout.vGetY();
            m_layout.vScrollAbort();
            invalidate();
            m_hold = true;
			break;
		case MotionEvent.ACTION_MOVE:
			if(m_hold_docx <= 0 && m_hold_docx + m_hold_x - event.getX() < 0) {
				Log.w("---test---","FLING x Viewpager");
				return false;
			}
            if(m_hold) {
                m_layout.vSetX((int) (m_hold_docx + m_hold_x - event.getX()));
                m_layout.vSetY((int) (m_hold_docy + m_hold_y - event.getY()));
                invalidate();
            }
			break;
		case MotionEvent.ACTION_UP:
		case MotionEvent.ACTION_CANCEL:
            if(m_hold) {
                m_layout.vSetX((int) (m_hold_docx + m_hold_x - event.getX()));
                m_layout.vSetY((int) (m_hold_docy + m_hold_y - event.getY()));
                invalidate();
                m_layout.vMoveEnd();
                m_hold = false;
            }
			break;
		case MotionEvent.ACTION_POINTER_DOWN:
			if( event.getPointerCount() >= 2 )
			{
				m_status = STA_ZOOM;
				m_hold_x = (event.getX(0) + event.getX(1))/2;
				m_hold_y = (event.getY(0) + event.getY(1))/2;
				m_zoom_pos = m_layout.vGetPos( (int)m_hold_x, (int)m_hold_y );
				float dx = event.getX(0) - event.getX(1);
				float dy = event.getY(0) - event.getY(1);
				m_zoom_dis0 = Global.sqrtf(dx * dx + dy * dy);
				m_zoom_scale = m_layout.vGetZoom();
				m_status = STA_ZOOM;
				m_layout.vZoomStart();
                if(m_listener != null)
                    m_listener.OnPDFZoomStart();
			}
			break;
		}
		return true;
	}