package com.bluemor.reddotface.view;
import android.content.Context;
import android.graphics.Color;
import android.graphics.PorterDuff.Mode;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v4.view.ViewCompat;
import android.support.v4.widget.ViewDragHelper;
import android.util.AttributeSet;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import com.bluemor.reddotface.R;
import com.nineoldandroids.view.ViewHelper;
public class DragLayout extends FrameLayout {
private boolean isShowShadow = true;
private GestureDetectorCompat gestureDetector;
private ViewDragHelper dragHelper;
private DragListener dragListener;
private int range;
private int width;
private int height;
private int mainLeft;
private Context context;
private ImageView iv_shadow;
private RelativeLayout vg_left;
private MyRelativeLayout vg_main;
private Status status = Status.Close;
public DragLayout(Context context) {
this(context, null);
}
public DragLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
this.context = context;
}
public DragLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
gestureDetector = new GestureDetectorCompat(context, new YScrollDetector());
dragHelper = ViewDragHelper.create(this, dragHelperCallback);
}
class YScrollDetector extends SimpleOnGestureListener {
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float dx, float dy) {
return Math.abs(dy) <= Math.abs(dx);
}
}
private ViewDragHelper.Callback dragHelperCallback = new ViewDragHelper.Callback() {
@Override
public int clampViewPositionHorizontal(View child, int left, int dx) {
if (mainLeft + dx < 0) {
return 0;
} else if (mainLeft + dx > range) {
return range;
} else {
return left;
}
}
@Override
public boolean tryCaptureView(View child, int pointerId) {
return true;
}
@Override
public int getViewHorizontalDragRange(View child) {
return width;
}
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
super.onViewReleased(releasedChild, xvel, yvel);
if (xvel > 0) {
open();
} else if (xvel < 0) {
close();
} else if (releasedChild == vg_main && mainLeft > range * 0.3) {
open();
} else if (releasedChild == vg_left && mainLeft > range * 0.7) {
open();
} else {
close();
}
}
@Override
public void onViewPositionChanged(View changedView, int left, int top,
int dx, int dy) {
if (changedView == vg_main) {
mainLeft = left;
} else {
mainLeft = mainLeft + left;
}
if (mainLeft < 0) {
mainLeft = 0;
} else if (mainLeft > range) {
mainLeft = range;
}
if (isShowShadow) {
iv_shadow.layout(mainLeft, 0, mainLeft + width, height);
}
if (changedView == vg_left) {
vg_left.layout(0, 0, width, height);
vg_main.layout(mainLeft, 0, mainLeft + width, height);
}
dispatchDragEvent(mainLeft);
}
};
public interface DragListener {
public void onOpen();
public void onClose();
public void onDrag(float percent);
}
public void setDragListener(DragListener dragListener) {
this.dragListener = dragListener;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
if (isShowShadow) {
iv_shadow = new ImageView(context);
iv_shadow.setImageResource(R.drawable.shadow);
LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
addView(iv_shadow, 1, lp);
}
vg_left = (RelativeLayout) getChildAt(0);
vg_main = (MyRelativeLayout) getChildAt(isShowShadow ? 2 : 1);
vg_main.setDragLayout(this);
vg_left.setClickable(true);
vg_main.setClickable(true);
}
public ViewGroup getVg_main() {
return vg_main;
}
public ViewGroup getVg_left() {
return vg_left;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
width = vg_left.getMeasuredWidth();
height = vg_left.getMeasuredHeight();
range = (int) (width * 0.6f);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
vg_left.layout(0, 0, width, height);
vg_main.layout(mainLeft, 0, mainLeft + width, height);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
return dragHelper.shouldInterceptTouchEvent(ev) && gestureDetector.onTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent e) {
try {
dragHelper.processTouchEvent(e);
} catch (Exception ex) {
ex.printStackTrace();
}
return false;
}
private void dispatchDragEvent(int mainLeft) {
if (dragListener == null) {
return;
}
float percent = mainLeft / (float) range;
animateView(percent);
dragListener.onDrag(percent);
Status lastStatus = status;
if (lastStatus != getStatus() && status == Status.Close) {
dragListener.onClose();
} else if (lastStatus != getStatus() && status == Status.Open) {
dragListener.onOpen();
}
}
private void animateView(float percent) {
float f1 = 1 - percent * 0.3f;
ViewHelper.setScaleX(vg_main, f1);
ViewHelper.setScaleY(vg_main, f1);
ViewHelper.setTranslationX(vg_left, -vg_left.getWidth() / 2.3f + vg_left.getWidth() / 2.3f * percent);
ViewHelper.setScaleX(vg_left, 0.5f + 0.5f * percent);
ViewHelper.setScaleY(vg_left, 0.5f + 0.5f * percent);
ViewHelper.setAlpha(vg_left, percent);
if (isShowShadow) {
ViewHelper.setScaleX(iv_shadow, f1 * 1.4f * (1 - percent * 0.12f));
ViewHelper.setScaleY(iv_shadow, f1 * 1.85f * (1 - percent * 0.12f));
}
getBackground().setColorFilter(evaluate(percent, Color.BLACK, Color.TRANSPARENT), Mode.SRC_OVER);
}
private Integer evaluate(float fraction, Object startValue, Integer endValue) {
int startInt = (Integer) startValue;
int startA = (startInt >> 24) & 0xff;
int startR = (startInt >> 16) & 0xff;
int startG = (startInt >> 8) & 0xff;
int startB = startInt & 0xff;
int endInt = (Integer) endValue;
int endA = (endInt >> 24) & 0xff;
int endR = (endInt >> 16) & 0xff;
int endG = (endInt >> 8) & 0xff;
int endB = endInt & 0xff;
return (int) ((startA + (int) (fraction * (endA - startA))) << 24)
| (int) ((startR + (int) (fraction * (endR - startR))) << 16)
| (int) ((startG + (int) (fraction * (endG - startG))) << 8)
| (int) ((startB + (int) (fraction * (endB - startB))));
}
@Override
public void computeScroll() {
if (dragHelper.continueSettling(true)) {
ViewCompat.postInvalidateOnAnimation(this);
}
}
public enum Status {
Drag, Open, Close
}
public Status getStatus() {
if (mainLeft == 0) {
status = Status.Close;
} else if (mainLeft == range) {
status = Status.Open;
} else {
status = Status.Drag;
}
return status;
}
public void open() {
open(true);
}
public void open(boolean animate) {
if (animate) {
if (dragHelper.smoothSlideViewTo(vg_main, range, 0)) {
ViewCompat.postInvalidateOnAnimation(this);
}
} else {
vg_main.layout(range, 0, range * 2, height);
dispatchDragEvent(range);
}
}
public void close() {
close(true);
}
public void close(boolean animate) {
if (animate) {
if (dragHelper.smoothSlideViewTo(vg_main, 0, 0)) {
ViewCompat.postInvalidateOnAnimation(this);
}
} else {
vg_main.layout(0, 0, width, height);
dispatchDragEvent(0);
}
}
}