/*
* The MIT License (MIT)
* Copyright (c) [2015] [chiemy]
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.chiemy.cardview.view;
import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.SparseArray;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.animation.AccelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.ListAdapter;
import com.nineoldandroids.animation.Animator;
import com.nineoldandroids.animation.AnimatorListenerAdapter;
import com.nineoldandroids.view.ViewHelper;
import com.nineoldandroids.view.ViewPropertyAnimator;
/**
* @author chiemy
*
*/
public class CardView extends FrameLayout {
private static final int ITEM_SPACE = 40;
private static final int DEF_MAX_VISIBLE = 4;
private int mMaxVisible = DEF_MAX_VISIBLE;
private int itemSpace = ITEM_SPACE;
private float mTouchSlop;
private ListAdapter mListAdapter;
private int mNextAdapterPosition;
private SparseArray<View> viewHolder = new SparseArray<View>();
private OnCardClickListener mListener;
private int topPosition;
private Rect topRect;
public interface OnCardClickListener {
void onCardClick(View view, int position);
}
public CardView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public CardView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public CardView(Context context) {
super(context);
init();
}
private void init() {
topRect = new Rect();
ViewConfiguration con = ViewConfiguration.get(getContext());
mTouchSlop = con.getScaledTouchSlop();
}
public void setMaxVisibleCount(int count) {
mMaxVisible = count;
}
public int getMaxVisibleCount() {
return mMaxVisible;
}
public void setItemSpace(int itemSpace) {
this.itemSpace = itemSpace;
}
public int getItemSpace() {
return itemSpace;
}
public ListAdapter getAdapter() {
return mListAdapter;
}
public void setAdapter(ListAdapter adapter) {
if (mListAdapter != null) {
mListAdapter.unregisterDataSetObserver(mDataSetObserver);
}
mNextAdapterPosition = 0;
mListAdapter = adapter;
adapter.registerDataSetObserver(mDataSetObserver);
removeAllViews();
ensureFull();
}
public void setOnCardClickListener(OnCardClickListener listener) {
mListener = listener;
}
private void ensureFull() {
while (mNextAdapterPosition < mListAdapter.getCount()
&& getChildCount() < mMaxVisible) {
int index = mNextAdapterPosition % mMaxVisible;
View convertView = viewHolder.get(index);
final View view = mListAdapter.getView(mNextAdapterPosition,
convertView, this);
view.setOnClickListener(null);
viewHolder.put(index, view);
// 添加剩余的View时，始终处在最后
index = Math.min(mNextAdapterPosition, mMaxVisible - 1);
ViewHelper.setScaleX(view,((mMaxVisible - index - 1) / (float) mMaxVisible) * 0.2f + 0.8f);
int topMargin = (mMaxVisible - index - 1) * itemSpace;
ViewHelper.setTranslationY(view, topMargin);
ViewHelper.setAlpha(view, mNextAdapterPosition == 0 ? 1 : 0.5f);
LayoutParams params = (LayoutParams) view.getLayoutParams();
if (params == null) {
params = new LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.WRAP_CONTENT);
}
addViewInLayout(view, 0, params);
mNextAdapterPosition += 1;
}
// requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int childCount = getChildCount();
int maxHeight = 0;
int maxWidth = 0;
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
this.measureChild(child, widthMeasureSpec, heightMeasureSpec);
int height = child.getMeasuredHeight();
int width = child.getMeasuredWidth();
if (height > maxHeight) {
maxHeight = height;
}
if (width > maxWidth) {
maxWidth = width;
}
}
int desireWidth = widthSize;
int desireHeight = heightSize;
if (widthMode == MeasureSpec.AT_MOST) {
desireWidth = maxWidth + getPaddingLeft() + getPaddingRight();
}
if (heightMode == MeasureSpec.AT_MOST) {
desireHeight = maxHeight + (mMaxVisible - 1) * itemSpace + getPaddingTop() + getPaddingBottom();
}
setMeasuredDimension(desireWidth, desireHeight);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
View topView = getChildAt(getChildCount() - 1);
if (topView != null) {
topView.setOnClickListener(listener);
}
}
float downX, downY;
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_MOVE:
if (goDown()) {
downY = -1;
}
break;
}
return super.onTouchEvent(event);
}
/**
* 下移所有视图
*/
private boolean goDown() {
final View topView = getChildAt(getChildCount() - 1);
if(!topView.isEnabled()){
return false;
}
// topView.getHitRect(topRect); 在4.3以前有bug，用以下方法代替
topRect = getHitRect(topRect, topView);
// 如果按下的位置不在顶部视图上，则不移动
if (!topRect.contains((int) downX, (int) downY)) {
return false;
}
topView.setEnabled(false);
ViewPropertyAnimator anim = ViewPropertyAnimator
.animate(topView)
.translationY(
ViewHelper.getTranslationY(topView)
+ topView.getHeight()).alpha(0).scaleX(1)
.setListener(null).setDuration(200);
anim.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
topView.setEnabled(true);
removeView(topView);
ensureFull();
final int count = getChildCount();
for (int i = 0; i < count; i++) {
final View view = getChildAt(i);
float scaleX = ViewHelper.getScaleX(view)
+ ((float) 1 / mMaxVisible) * 0.2f;
float tranlateY = ViewHelper.getTranslationY(view)
+ itemSpace;
if (i == count - 1) {
bringToTop(view);
} else {
if ((count == mMaxVisible && i != 0)
|| count < mMaxVisible) {
ViewPropertyAnimator
.animate(view)
.translationY(tranlateY)
.setInterpolator(
new AccelerateInterpolator())
.setListener(null).scaleX(scaleX)
.setDuration(200);
}
}
}
}
});
return true;
}
/**
* 将下一个视图移到前边
*
* @param view
*/
private void bringToTop(final View view) {
topPosition++;
float scaleX = ViewHelper.getScaleX(view) + ((float) 1 / mMaxVisible)
* 0.2f;
float tranlateY = ViewHelper.getTranslationY(view) + itemSpace;
ViewPropertyAnimator.animate(view).translationY(tranlateY)
.scaleX(scaleX).setDuration(200).alpha(1)
.setInterpolator(new AccelerateInterpolator());
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
float currentY = ev.getY();
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = ev.getX();
downY = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
float distance = currentY - downY;
if (distance > mTouchSlop) {
return true;
}
break;
}
return false;
}
public static Rect getHitRect(Rect rect, View child) {
rect.left = child.getLeft();
rect.right = child.getRight();
rect.top = (int) (child.getTop() + ViewHelper.getTranslationY(child));
rect.bottom = (int) (child.getBottom() + ViewHelper
.getTranslationY(child));
return rect;
}
private final DataSetObserver mDataSetObserver = new DataSetObserver() {
@Override
public void onChanged() {
super.onChanged();
}
@Override
public void onInvalidated() {
super.onInvalidated();
}
};
private OnClickListener listener = new OnClickListener() {
@Override
public void onClick(View v) {
if (mListener != null) {
mListener.onCardClick(v, topPosition);
}
}
};
}
