harmonyos桌面布局设置（HarmonyOS实现Material风格的下拉刷新）
harmonyos桌面布局设置（HarmonyOS实现Material风格的下拉刷新）2.SunLayout头部包含滚动短线SunLineView和笑脸SunFaceView。1.MaterialRefreshLayout包含SunLayout头部布局和脚部布局MaterialFooterView。2.头部MaterialHeaderView包含圆形转动条CircleProgressBar和下拉波纹MaterialWaveView。3.脚部布局MaterialFooterView同头部结构一致，包含圆形转动条CircleProgressBar和下拉波纹MaterialWaveView。4.CircleProgressBar包含有自定义图形的MaterialProgressDrawable，设置圆形的转动图案。
介绍Ohos-MaterialRefreshLayout是一个自定义Material风格下拉刷新控件，支持设置水波纹效果，支持下拉刷新侵入式和非侵入式，初始化自动刷新及上滑加载更多，支持刷新头部自定义图案，上拉加载更多等。该控件一般配合ListContainer使用 因涉及事件分发操作，本库中使用了三方控件NestedListContainer、事件分发等方便处理事件拦截分发事件。
效果图:
MaterialRefreshLayout控件，首先初始化设置头部、脚部布局 在手势下滑时显示头部布局，动态设置头部高度，展示下拉刷新效果，在页面底部向上滑动时显示脚部布局，展示上拉加载更多效果，松手时图形即开始旋转动画。
下拉圆形转动风格MaterialRefreshLayout1.MaterialRefreshLayout包含自定义头部布局MaterialHeaderView和脚部布局MaterialFooterView。
2.头部MaterialHeaderView包含圆形转动条CircleProgressBar和下拉波纹MaterialWaveView。
3.脚部布局MaterialFooterView同头部结构一致，包含圆形转动条CircleProgressBar和下拉波纹MaterialWaveView。
4.CircleProgressBar包含有自定义图形的MaterialProgressDrawable，设置圆形的转动图案。
下拉自定义笑脸风格MaterialRefreshLayout1.MaterialRefreshLayout包含SunLayout头部布局和脚部布局MaterialFooterView。
2.SunLayout头部包含滚动短线SunLineView和笑脸SunFaceView。
2.当有手势下滑时，自定义短线SunLineView，开始旋转动画，监听刷新动作，在onSizeChanged中动态改变图形大小。
3.当手势向下滑动时，自定义笑脸图形SunFaceView，监听刷新动作，在onSizeChanged中动态改变图形大小。
代码实现解读首先在拦截事件中根据手指的滑动距离，设置自定义头部布局MaterialHeaderView可见，底部向上滑动时，当滑到页面底部，设置脚部布局MaterialFooterView可见。
事件分发onInterceptTouchEvent中设置头、脚布局可见在拦截事件onInterceptTouchEvent中，手指移动TouchEvent.POINT_MOVE时，根据滑动距离及是否是在头部的滑动，设置头部自定义headerview是否显示，再根据向上滑动距离是否小于0及是否滑动到底部加载底部footerview。代码如下：
case TouchEvent.POINT_MOVE:
float currentY = ev.getPointerPosition(0).getY();
Float dy= new BigDecimal(currentY).subtract(new BigDecimal(mTouchY)).floatValue();
if (dy > 0 && !canChildScrollUp()) {
if (mMaterialHeaderView != null) {
mMaterialHeaderView.setVisibility(Component.VISIBLE);
mMaterialHeaderView.onBegin(this);
} else if (mSunLayout != null) {
mSunLayout.setVisibility(Component.VISIBLE);
mSunLayout.onBegin(this);
}
return true;
} else if (dy < 0 && !canChildScrollDown() && isLoadMore) {
if (mMaterialFooterView != null && !isLoadMoreing) {
soveLoadMoreLogic();
}
return false;
}
break;
上一步完成后，紧接着就是在触摸事件中动态设置头部布局高度，水波纹高度，滑到最大距离时，设置为控件本身高度。
事件触摸onTouchEvent中设置高度- 在触摸事件onTouchEvent中，当手指下滑，onTouchEvent中设置头部自定义headerview的高度，随着下滑距离增加，动态设置水波纹高度，当头部为侵入式时，设置component向下平移。代码如下：
case TouchEvent.POINT_MOVE:
mCurrentY = e.getPointerPosition(0).getY();
float dy = new BigDecimal(mCurrentY).subtract(new BigDecimal(mTouchY)).floatValue();
dy = Math.min(mWaveHeight * 2 dy);
dy = Math.max(0 dy);
if (mChildView != null) {
float offsetY = dy / 2;
float fraction = offsetY / mHeadHeight;
if (mMaterialHeaderView != null) {
mMaterialHeaderView.setHeight((int) offsetY);
mMaterialHeaderView.postLayout();
mMaterialHeaderView.onPull(this fraction);
} else if (mSunLayout != null) {
mSunLayout.setHeight((int) offsetY);
mSunLayout.postLayout();
mSunLayout.startSunLineAnim(this);
mSunLayout.onPull(this fraction);
}
if (!isOverlay)
mChildView.setTranslationY(offsetY);
}
在松手时，监听抬起事件TouchEvent.PRIMARY_POINT_UP，当头部headerview高度大于原有高度时，将头部设置为刷新中状态，代码如下：
if (mMaterialHeaderView.getLayoutConfig().height > mHeadHeight) {
updateListener();
mMaterialHeaderView.setHeight((int) mHeadHeight);
mMaterialHeaderView.postLayout();
}
再接下来就是完成自定义头部控件的布局，并在下拉接口方法中设置下拉时的缩放，透明度等状态。
自定义头部MaterialHeaderView自定义MaterialHeaderView由MaterialWaveView和CircleProgressBar两个自定义Component组合成，实现MaterialHeadListener接口。
- onBegin方法中设置materialWaveView的起始状态，circleProgressBar缩放大小，透明度等。代码如下：
@Override
public void onBegin(MaterialRefreshLayout materialRefreshLayout) {
if (materialWaveView != null) {
materialWaveView.onBegin(materialRefreshLayout);
}
if (circleProgressBar != null) {
circleProgressBar.setScaleX(0.001f);
circleProgressBar.setScaleY(0.001f);
circleProgressBar.onBegin(materialRefreshLayout);
}
}
onPull方法中设置materialWaveView的下拉状态，circleProgressBar缩放大小，透明度等。代码如下：
@Override
public void onPull(MaterialRefreshLayout materialRefreshLayout float fraction) {
if (materialWaveView != null) {
materialWaveView.onPull(materialRefreshLayout fraction);
}
if (circleProgressBar != null) {
circleProgressBar.onPull(materialRefreshLayout fraction);
float a = Util.limitValue(1 fraction);
circleProgressBar.setScaleX(a);
circleProgressBar.setScaleY(a);
circleProgressBar.setAlpha(a);
}
}
设置刷新中onRefreshing状态。代码如下：
@Override
public void onRefreshing(MaterialRefreshLayout materialRefreshLayout) {
if (materialWaveView != null) {
materialWaveView.onRefreshing(materialRefreshLayout);
}
if (circleProgressBar != null) {
circleProgressBar.onRefreshing(materialRefreshLayout);
}
}
onComlete刷新完成后自定义Component的状态初始化，代码如下：
@Override
public void onComlete(MaterialRefreshLayout materialRefreshLayout) {
if (materialWaveView != null) {
materialWaveView.onComlete(materialRefreshLayout);
}
if (circleProgressBar != null) {
circleProgressBar.onComlete(materialRefreshLayout);
circleProgressBar.setTranslationY(0);
circleProgressBar.setScaleX(0);
circleProgressBar.setScaleY(0);
}
}
头部布局完成后，接下来就是实现自定义脚部布局实现。
自定义脚部MaterialFooterView自定义MaterialFooterView由MaterialWaveView和CircleProgressBar两个自定义Component组合成，实现MaterialHeadListener接口。基本同MaterialHeaderView一致，接口实现方法设置内容相同。
- onBegin方法中设置materialWaveView的起始状态，circleProgressBar缩放1，透明度等。代码如下：
@Override
public void onBegin(MaterialRefreshLayout materialRefreshLayout) {
if (materialWaveView != null) {
materialWaveView.onBegin(materialRefreshLayout);
}
if (circleProgressBar != null) {
circleProgressBar.onBegin(materialRefreshLayout);
circleProgressBar.setScaleX(1);
circleProgressBar.setScaleY(1);
}
}
onPull方法中设置materialWaveView的下拉状态，circleProgressBar缩放1，透明度等。代码如下：
@Override
public void onPull(MaterialRefreshLayout materialRefreshLayout float fraction) {
if (materialWaveView != null) {
materialWaveView.onPull(materialRefreshLayout fraction);
}
if (circleProgressBar != null) {
circleProgressBar.onPull(materialRefreshLayout fraction);
float a = Util.limitValue(1 fraction);
circleProgressBar.setScaleX(1);
circleProgressBar.setScaleY(1);
circleProgressBar.setAlpha(a);
}
}
设置刷新中onRefreshing状态。代码如下：
@Override
public void onRefreshing(MaterialRefreshLayout materialRefreshLayout) {
if (materialWaveView != null) {
materialWaveView.onRefreshing(materialRefreshLayout);
}
if (circleProgressBar != null) {
circleProgressBar.onRefreshing(materialRefreshLayout);
}
}
onComlete刷新完成后自定义Component的状态初始化，代码如下：####
@Override
public void onComlete(MaterialRefreshLayout materialRefreshLayout) {
if (materialWaveView != null) {
materialWaveView.onComlete(materialRefreshLayout);
}
if (circleProgressBar != null) {
circleProgressBar.onComlete(materialRefreshLayout);
circleProgressBar.setTranslationY(0);
circleProgressBar.setScaleX(0);
circleProgressBar.setScaleY(0);
}
}
头部、脚部布局都完成后，就开始要完成头部和脚部布局里面的自定义组件，首先从头部布局中的自定义组件开始，前面讲到头部由圆形转动条CircleProgressBar和下拉波纹MaterialWaveView组成，先开始绘制波浪纹MaterialWaveView，实现MaterialHeadListener接口，接口回调中设置组件的状态。
自定义MaterialWaveView- 初始化画笔设置，添加addDrawTask任务，onDraw方法中绘制下拉区域图形，并填充颜色，代码如下：
@Override
public void onDraw(Component component Canvas canvas) {
path.reset();
paint.setColor(new Color(color));
path.lineTo(0 headHeight);
path.quadTo(getEstimatedWidth() / (float) 2 headHeight waveHeight getEstimatedWidth() headHeight);
path.lineTo(getEstimatedWidth() 0);
canvas.drawPath(path paint);
}
实现MaterialHeadListener接口，监听各下拉方法的回调，当有下拉的情形时，改变下拉区域状态。下拉时在onPull中，设置下拉区域header高度及wave高度。刷新中onRefreshing，加载数值动画并动态改变wave高度。结束onComlete中，加载数值动画动态改变head的高度。代码如下：
- 下拉时：
@Override
public void onPull(MaterialRefreshLayout br float fraction) {
setHeadHeight((int) (Util.dip2px(getContext() DefaulHeadHeight) * Util.limitValue(1 fraction)));
setWaveHeight((int) (Util.dip2px(getContext() DefaulWaveHeight) * Math.max(0 new BigDecimal(fraction).subtract(new BigDecimal(1)).floatValue())));
invalidate();
}
刷新时：
@Override
public void onRefreshing(MaterialRefreshLayout br) {
setHeadHeight((int) (Util.dip2px(getContext() DefaulHeadHeight)));
int waveHeight = getWaveHeight();
AnimatorValue animator = new AnimatorValue();
animator.setValueUpdateListener(new AnimatorValue.ValueUpdateListener() {
@Override
public void onUpdate(AnimatorValue animatorValue float value) {
setWaveHeight(getIntValue((1 - (double) value) * waveHeight));
invalidate();
}
});
animator.setCurveType(Animator.CurveType.BOUNCE);
animator.setDuration(200);
animator.start();
}
结束时：
@Override
public void onComlete(MaterialRefreshLayout br) {
waveHeight = 0;
AnimatorValue animator = new AnimatorValue();
animator.setDuration(200);
animator.setValueUpdateListener(new AnimatorValue.ValueUpdateListener() {
@Override
public void onUpdate(AnimatorValue animatorValue float value) {
headHeight = getIntValue((1 - (double) value) * headHeight);
invalidate();
}
});
animator.start();
}
上一步完成后接下来开始实现头部圆形转动的CircleProgressBar，并设置图案的自定义ShapeElement图形，配合手势操作，下拉时设置图形动态大小，松手时旋转刷新。
自定义CircleProgressBar- 自定义圆形转动CircleProgressBar 设置自定义背景MaterialProgressDrawable，实现MaterialHeadListener接口，根据下拉状态设置圆形MaterialProgressDrawable旋转角度，释放手势时开始动画，结束后停止旋转并初始化状态等。代码如下：
@Override
public void onPull(MaterialRefreshLayout materialRefreshLayout float fraction) {
if (mProgressDrawable != null)
mProgressDrawable.setProgressRotation(fraction);
invalidate();
}
@Override
Public void onRefreshing(MaterialRefreshLayout materialRefreshLayout) {
if (mProgressDrawable != null) {
mProgressDrawable.onStart();
}
}
@Override
public void onComlete(MaterialRefreshLayout materialRefreshLayout) {
if (mProgressDrawable != null) {
mProgressDrawable.onStop();
}
setVisibility(Component.INVISIBLE);
}
- 自定义MaterialProgressDrawable设置CircleProgressBar的背景
首先构造方法中初始化圆形Ring和旋转动画，设置画笔颜色，宽度，大小，在drawToCanvas中绘制圆形Ring 当有手势操作时调用onStart方法中的旋转动画，开始旋转。在Ring类draw方法中，根据起始旋转角度绘制圆形圈圈及三角箭头，代码如下：
public void draw(Canvas c Rect bounds) {
final RectFloat arcBounds = mTempBounds;
arcBounds.modify(bounds);
arcBounds.left = new BigDecimal(arcBounds.left).add(new BigDecimal(mStrokeInset)).floatValue();
arcBounds.top = new BigDecimal(arcBounds.top).add(new BigDecimal(mStrokeInset)).floatValue();
arcBounds.right = new BigDecimal(arcBounds.right).subtract(new BigDecimal(mStrokeInset)).floatValue();
arcBounds.bottom = new BigDecimal(arcBounds.bottom).subtract(new BigDecimal(mStrokeInset)).floatValue();
final float startAngle = new BigDecimal(mStartTrim).add(new BigDecimal(mRotation)).floatValue() * 360;
final float endAngle = new BigDecimal(mEndTrim).add(new BigDecimal(mRotation)).floatValue() * 360;
float sweepAngle = new BigDecimal(endAngle).subtract(new BigDecimal(startAngle)).floatValue();
mPaint.setColor(Color.RED);
c.drawArc(arcBounds new Arc(startAngle sweepAngle false) mPaint);
drawTriangle(c startAngle sweepAngle bounds);
if (mAlpha < 255) {
mCirclePaint.setColor(new Color(mBackgroundColor));
mCirclePaint.setAlpha(255 - mAlpha);
c.drawCircle(bounds.getCenterX() bounds.getCenterY() bounds.getWidth() / (float) 2
mCirclePaint);
}
}
上述基本上就完成了Material风格下拉刷新带水波纹，带转动progressbar的实现步骤，紧接着讲一讲下拉自定义笑脸的另外一种刷新风格，实际上就是重新定义了刷新头部的图形，在这里也可以自己尝试替换成其它不同的图形。
自定义头部SunLayout布局自定义头部SunLayout由SunFaceView和SunLineView组成，SunFaceView为自定义笑脸，SunLineView为自定义笑脸周围短线。SunLayout实现了MaterialHeadListener接口，开始状态onBegin时缩放从零到有，下拉onPull时，设置SunView和LineView的大小，缩放等。代码如下：
- 开始时：
@Override
public void onBegin(MaterialRefreshLayout materialRefreshLayout) {
setScaleX(0.001f);
setScaleY(0.001f);
}
下拉时:
@Override
public void onPull(MaterialRefreshLayout materialRefreshLayout float fraction) {
float a = Util.limitValue(1 fraction);
if (a >= 0.7) {
mLineView.setVisibility(VISIBLE);
} else {
mLineView.setVisibility(HIDE);
}
mSunView.setPerView(mSunRadius a);
mLineView.setLineWidth(mLineWidth);
setScaleX(a);
setScaleY(a);
setAlpha(a);
}
- 自定义笑脸SunFaceView
继承Component实现Component.EstimateSizeListener Component.DrawTask接口，onEstimateSize中获取实际宽高，根据宽高onDraw中绘制圆形笑脸，代码如下：
private void drawCircle(Canvas canvas) {
mCirclePaint.setColor(new Color(mSunColor));
mCirclePaint.setStyle(Paint.Style.FILL_STYLE);
canvas.drawCircle(mWidth / (float) 2 mHeight / (float) 2 mSunRadius mCirclePaint);
mCirclePaint.setColor(Color.WHITE);
if (isDrawFace) {
mouthRect.left = mWidth / 2 - mSunRadius / 2;
mouthRect.right = mWidth / 2 mSunRadius / 2;
mouthRect.top = mHeight / 2 - mSunRadius / 2;
mouthRect.bottom = mHeight / 2 mSunRadius / 2;
canvas.save();
canvas.drawCircle(mWidth / 2 - mSunRadius / 2 mEyesRadius mHeight / 2 - mSunRadius / 2 mEyesRadius mEyesRadius mCirclePaint);
canvas.drawCircle(mWidth / 2 mSunRadius / 2 - mEyesRadius mHeight / 2 - mSunRadius / 2 mEyesRadius mEyesRadius mCirclePaint);
mCirclePaint.setStyle(Paint.Style.STROKE_STYLE);
mCirclePaint.setStrokeWidth(mouthStro);
canvas.drawArc(mouthRect new Arc(20 140 false) mCirclePaint);
canvas.restore();
}
}
- 自定义短线SunLineView
SunLineView继承Component实现Component.DrawTask Component.EstimateSizeListener接口，构造方法中初始化Paint，onEstimateSize中测量宽高，onDraw中绘制线条，代码如下：
- 测量时：
@Override
public boolean onEstimateSize(int widthMeasureSpec int heightMeasureSpec) {
HiLog.info(Contants.LABEL "onMeasure");
int widthMode = EstimateSpec.getMode(widthMeasureSpec);
int widthSize = EstimateSpec.getSize(widthMeasureSpec);
int heightMode = EstimateSpec.getMode(heightMeasureSpec);
int heightSize = EstimateSpec.getSize(heightMeasureSpec);
int width;
int height;
if (widthMode == EstimateSpec.PRECISE) {
width = widthSize;
} else {
width = (mSunRadius mFixLineHeight mLineHeight) * 2 getPaddingRight() getPaddingLeft();
}
if (heightMode == EstimateSpec.PRECISE) {
height = heightSize;
} else {
height = (mSunRadius mFixLineHeight mLineHeight) * 2 getPaddingTop() getPaddingBottom();
}
setEstimatedSize(width height);
mWidth = width;
mHeight = height;
return false;
}
画线条:
private void drawLines(Canvas canvas) {
for (int i = 0; i <= 360; i ) {
if (i % mLineLevel == 0) {
mLineLeft = mWidth / 2 - mLineWidth / 2;
mLineTop = mHeight / 2 - mSunRadius - mFixLineHeight;
mLineBottom = mLineTop mLineHeight;
canvas.save();
canvas.rotate(i mWidth / (float) 2 mHeight / (float) 2);
canvas.drawLine(mLineLeft mLineTop mLineLeft mLineBottom mLinePaint);
canvas.restore();
}
}
}代码参考
https://gitee.com/chinasoft5_ohos/Ohos-MaterialRefreshLayout
