ModeSwitchView (used for horizontal switching in the camera) and modeswitchview

ModeSwitchView (used for horizontal switching in the camera) and modeswitchview

Core

public class ModeSwitchView extends LinearLayout implements View.OnClickListener {    private ModeScroller mCameraScroller;    private TextView document;    private TextView idcard;    private TextView whiteboard;    private TextView paperwork;    public static final int MODE_DOCUMENT = 0;    public static final int MODE_IDCARD = 1;    public static final int MODE_WHITEBOARD = 2;    public static final int MODE_PAPERWORK = 3;    public static class IndexUtil {        public final static int MIN_INDEX = 0;        public final static int MAX_INDEX = 3;        public final static int DEFAULT_INDEX = ModeSwitchView.MODE_DOCUMENT;        private static int SELECTED_INDEX = DEFAULT_INDEX;        public static int getCurrentSelectedIndex() {            return SELECTED_INDEX;        }        public static void setSelectedIndex(int index) {            SELECTED_INDEX = index;        }    }    private OnStateChangeListener mListener;    public interface OnStateChangeListener {        void onStateChange(int state);    }    public void setOnStateChangeListener(OnStateChangeListener mListener) {        this.mListener = mListener;    }    public ModeSwitchView(Context context, AttributeSet attrs) {        super(context, attrs);        LayoutInflater.from(context).inflate(R.layout.argus_mode_scroller_layout, this, true);        mCameraScroller = (ModeScroller) findViewById(R.id.camera_scroller);        document = (TextView) mCameraScroller.findViewById(R.id.document);        idcard = (TextView) mCameraScroller.findViewById(R.id.idcard);        whiteboard = (TextView) mCameraScroller.findViewById(R.id.whiteboard);        paperwork = (TextView) mCameraScroller.findViewById(R.id.paperwork);        document.setOnClickListener(this);        idcard.setOnClickListener(this);        whiteboard.setOnClickListener(this);        paperwork.setOnClickListener(this);    }    public void moveLeft() {        if (IndexUtil.getCurrentSelectedIndex() <= IndexUtil.MIN_INDEX) {            return;        }        mCameraScroller.leftIndex = IndexUtil.getCurrentSelectedIndex() - 1;        mCameraScroller.rightIndex = IndexUtil.getCurrentSelectedIndex();        int dx = Math.round((mCameraScroller.getChildAt(mCameraScroller.leftIndex).getWidth() + mCameraScroller.getChildAt(mCameraScroller.rightIndex).getWidth()) / 2.0F);        if (!mCameraScroller.mScroller.isFinished()) {            return;        }        mCameraScroller.mScroller.startScroll(mCameraScroller.getScrollX(), 0, -dx, 0, mCameraScroller.duration);        mCameraScroller.scrollToNext(mCameraScroller.rightIndex, mCameraScroller.leftIndex);        IndexUtil.setSelectedIndex(IndexUtil.getCurrentSelectedIndex() - 1);        mCameraScroller.invalidate();        notifyUI(IndexUtil.getCurrentSelectedIndex());    }    public void moveRight() {        if (IndexUtil.getCurrentSelectedIndex() >= IndexUtil.MAX_INDEX) {            return;        }        mCameraScroller.leftIndex = IndexUtil.getCurrentSelectedIndex();        mCameraScroller.rightIndex = IndexUtil.getCurrentSelectedIndex() + 1;        int dx = Math.round((mCameraScroller.getChildAt(mCameraScroller.leftIndex).getWidth() + mCameraScroller.getChildAt(mCameraScroller.rightIndex).getWidth()) / 2.0F);        if (!mCameraScroller.mScroller.isFinished()) {            return;        }        mCameraScroller.mScroller.startScroll(mCameraScroller.getScrollX(), 0, dx, 0, mCameraScroller.duration);        mCameraScroller.scrollToNext(mCameraScroller.leftIndex, mCameraScroller.rightIndex);        IndexUtil.setSelectedIndex(IndexUtil.getCurrentSelectedIndex() + 1);        mCameraScroller.invalidate();        notifyUI(IndexUtil.getCurrentSelectedIndex());    }    public void moveTo(int index) {        int selectedIndex = IndexUtil.getCurrentSelectedIndex();        View selectView = mCameraScroller.getChildAt(selectedIndex);        View dstView = mCameraScroller.getChildAt(index);        int dx = Math.abs((int) ((selectView.getRight() - selectView.getWidth() / 2f) - (dstView.getRight() - dstView.getWidth() / 2f)));        if (index < selectedIndex) {            dx = -dx;        }        if (!mCameraScroller.mScroller.isFinished()) {            return;        }        mCameraScroller.mScroller.startScroll(mCameraScroller.getScrollX(), 0, dx, 0, mCameraScroller.duration);        mCameraScroller.scrollToNext(selectedIndex, index);        IndexUtil.setSelectedIndex(index);        mCameraScroller.invalidate();        notifyUI(index);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.document:                moveTo(MODE_DOCUMENT);                break;            case R.id.idcard:                moveTo(MODE_IDCARD);                break;            case R.id.whiteboard:                moveTo(MODE_WHITEBOARD);                break;            case R.id.paperwork:                moveTo(MODE_PAPERWORK);                break;        }    }    public void setCurrentMode(int index) {        if (index > IndexUtil.MAX_INDEX || index < IndexUtil.MIN_INDEX) {            return;        }        moveTo(index);    }    private void notifyUI(int index) {        if (mListener != null) {            mListener.onStateChange(index);        }    }    private boolean mScrolling;    private float touchDownX;    private float touchDownY;    @Override    public boolean onInterceptTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                touchDownX = event.getX();                touchDownY = event.getY();                mScrolling = false;                break;            case MotionEvent.ACTION_MOVE:                int slop = ViewConfiguration.get(getContext()).getScaledTouchSlop();                if (Math.abs(touchDownX - event.getX()) >= slop || Math.abs(touchDownY - event.getY()) >= slop) {                    mScrolling = true;                } else {                    mScrolling = false;                }                break;            case MotionEvent.ACTION_UP:                mScrolling = false;                break;        }        return mScrolling;    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                return true;            case MotionEvent.ACTION_UP:                int deltaX = (int) (event.getX() - touchDownX);                int deltaY = (int) (event.getY() - touchDownY);                int slop = ViewConfiguration.get(getContext()).getScaledTouchSlop();                if (Math.abs(deltaX) > slop) {                    // swipe left                    if (deltaX < -Math.abs(deltaY) * 2) {                        moveRight();                    }                    // swipe right                    if (deltaX >= Math.abs(deltaY) * 2) {                        moveLeft();                    }                }                break;        }        return super.onTouchEvent(event);    }}

public class ModeScroller extends ViewGroup {    public Scroller mScroller;    public int leftIndex;    public int rightIndex;    public int duration = 250;    public ModeScroller(Context context, AttributeSet attrs) {        super(context, attrs);        mScroller = new Scroller(context);    }    public final void scrollToNext(int preIndex, int nextIndex) {        TextView selectedText = (TextView) getChildAt(preIndex);        if (selectedText != null) {            selectedText.setTextColor(getResources().getColor(android.R.color.white));        }        selectedText = (TextView) getChildAt(nextIndex);        if (selectedText != null) {            selectedText.setTextColor(getResources().getColor(R.color.chosen_color_yellow));        }    }    public void computeScroll() {        if (mScroller.computeScrollOffset()) {            scrollTo(mScroller.getCurrX(), mScroller.getCurrY());            invalidate();        }        super.computeScroll();    }    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        measureChildren(widthMeasureSpec, heightMeasureSpec);        setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec));    }    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        int cCount = getChildCount();        int selectedMode = ModeSwitchView.IndexUtil.getCurrentSelectedIndex();        int widthOffset = 0;        for (int i = 0; i < cCount; i++) {            View childView = getChildAt(i);            if (i < selectedMode) {                widthOffset += childView.getMeasuredWidth();            }        }        int childLeft = 0;        int childRight = 0;        for (int i = 0; i < cCount; i++) {            View childView = getChildAt(i);            if (i != 0) {                View preView = getChildAt(i - 1);                childLeft = preView.getRight();                childRight = childLeft + childView.getMeasuredWidth();            } else {                childLeft = (getWidth() - getChildAt(selectedMode).getMeasuredWidth()) / 2 - widthOffset + mScroller.getFinalX();                childRight = childLeft + childView.getMeasuredWidth();            }            childView.layout(childLeft, top, childRight, bottom);        }        TextView indexText = (TextView) getChildAt(ModeSwitchView.IndexUtil.getCurrentSelectedIndex());        indexText.setTextColor(getResources().getColor(R.color.chosen_color_yellow));    }}

Layout File

Style