packagecom.lonzh.finace.widget;
importandroid.graphics.Canvas;
importandroid.graphics.Rect;
importandroid.graphics.drawable.Drawable;
importandroid.support.v7.widget.RecyclerView;
importandroid.view.View;
/**
* Created by Administrator on 2017/10/19 0019.
*/
public classGridItemDecorationextendsRecyclerView.ItemDecoration {
privateDrawablemDivider;
private intspanCount;
private intspaceSize;
private booleanincludeLREdge;
private booleanincludeTBEdge;
private booleandrawLREdge;
private booleandrawTBEdge;
privateGridItemDecoration(Builder builder) {
mDivider= builder.mDivider;
spanCount= builder.spanCount;
spaceSize= builder.spaceSize;
includeLREdge= builder.includeLREdge;
includeTBEdge= builder.includeTBEdge;
drawLREdge= builder.drawLREdge;
drawTBEdge= builder.drawTBEdge;
}
@Override
publicStringtoString() {
return"GridItemDecoration{"+
"spanCount="+spanCount+
", spaceSize="+spaceSize+
", includeLREdge="+includeLREdge+
", includeTBEdge="+includeTBEdge+
'}';
}
@Override
public voidgetItemOffsets(Rect outRect,View view,RecyclerView parent,RecyclerView.State state) {
intposition = parent.getChildAdapterPosition(view);// item position
intcolumn = position %spanCount;// item column
if(includeLREdge) {
outRect.left=spaceSize- column *spaceSize/spanCount;
outRect.right= (column +1) *spaceSize/spanCount;
}else{
outRect.left= column *spaceSize/spanCount;
outRect.right=spaceSize- (column +1) *spaceSize/spanCount;
}
if(includeTBEdge) {
if(position
outRect.bottom=spaceSize;// item bottom
}else{
if(position >=spanCount) outRect.top=spaceSize;// item top
}
}
@Override
public voidonDraw(Canvas c,RecyclerView parent,RecyclerView.State state) {
if(mDivider!=null) {
drawHorizontal(c,parent);
drawVertical(c,parent);
if(includeLREdge&&drawLREdge) drawLR(c,parent);
if(includeTBEdge&&drawTBEdge) drawTB(c,parent);
}
}
private voiddrawLR(Canvas c,RecyclerView parent) {
intchildCount = parent.getChildCount();
for(inti =0;i < childCount;i++) {
View child = parent.getChildAt(i);
//最左边那条线
if(i %spanCount==0) {
intleft = child.getLeft() -spaceSize;
intright = left +spaceSize;
intbottom = child.getBottom();
inttop = child.getTop() -spaceSize;
if(i ==0) top = child.getTop();//【左上方】那一块交给drawTB绘制
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
//最右边那条线
if((i +1) %spanCount==0) {
intleft = child.getRight();
intright = left +spaceSize;
intbottom = child.getBottom();
inttop = child.getTop() -spaceSize;
if(i ==spanCount-1) top = child.getTop();//【右上方】那一块交给drawTB绘制
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
}
}
private voiddrawTB(Canvas c,RecyclerView parent) {
intchildCount = parent.getChildCount();
for(inti =0;i < childCount;i++) {
View child = parent.getChildAt(i);
//最上边那条线
if(i
inttop = child.getTop() -spaceSize;
intbottom = top +spaceSize;
intleft = child.getLeft();
intright = child.getRight() +spaceSize;
if((i +1) %spanCount==0||
(childCount
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
//最下边那条线
if(childCount %spanCount==0&& i >=spanCount* (childCount /spanCount-1)) {
inttop = child.getBottom();
intbottom = top +spaceSize;
intleft = child.getLeft() -spaceSize;
intright = child.getRight();
if((i +1) %spanCount==0) right = child.getRight() +spaceSize;//最右边那条线
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}else if(i >=spanCount* (childCount /spanCount)) {
inttop = child.getBottom();
intbottom = top +spaceSize;
intright = child.getRight();
intleft = child.getLeft() -spaceSize;
if(!drawLREdge&& i %spanCount==0) left = child.getLeft();//最左边那条线
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
}
}
private voiddrawHorizontal(Canvas c,RecyclerView parent) {
intchildCount = parent.getChildCount();
for(inti =0;i < childCount;i++) {
if(i >=spanCount) {
View child = parent.getChildAt(i);
intleft = child.getLeft() -spaceSize;
if(i %spanCount==0) left = child.getLeft();
intright = child.getRight();
inttop = child.getTop() -spaceSize;
intbottom = top +spaceSize;
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
}
}
private voiddrawVertical(Canvas c,RecyclerView parent) {
intchildCount = parent.getChildCount();
for(inti =0;i < childCount;i++) {
if(i %spanCount!=0) {
View child = parent.getChildAt(i);
inttop = child.getTop();
intbottom = child.getBottom();
intleft = child.getLeft() -spaceSize;
intright = left +spaceSize;
mDivider.setBounds(left,top,right,bottom);
mDivider.draw(c);
}
}
}
public static final classBuilder {
privateDrawablemDivider=null;
private intspanCount;
private intspaceSize;
private booleanincludeLREdge=false;
private booleanincludeTBEdge=false;
private booleandrawLREdge=true;
private booleandrawTBEdge=true;
publicBuilder() {
}
/**
* 若不指定，则使用空白代替
*/
publicBuildermDivider(Drawable val) {
mDivider= val;
return this;
}
/**
* 行数或列数
*/
publicBuilderspanCount(intval) {
spanCount= val;
return this;
}
/**
* 行列间距大小
*/
publicBuilderspaceSize(intval) {
spaceSize= val;
return this;
}
/**
* 是否包含左右边界
*/
publicBuilderincludeLREdge(booleanval) {
includeLREdge= val;
return this;
}
/**
* 是否包含上下边界
*/
publicBuilderincludeTBEdge(booleanval) {
includeTBEdge= val;
return this;
}
/**
* 是否绘制左右边界
*/
publicBuilderdrawLREdge(booleanval) {
drawLREdge= val;
return this;
}
/**
* 是否绘制上下边界
*/
publicBuilderdrawTBEdge(booleanval) {
drawTBEdge= val;
return this;
}
publicGridItemDecorationbuild() {
return newGridItemDecoration(this);
}
}
}
//使用
public voidsetItemDecoration(intsize, intcount) {
GridItemDecoration.Builder builder =newGridItemDecoration.Builder();
builder.mDivider(_mActivity.getResources().getDrawable(R.color.sy_gray))
.spaceSize(size)
.drawLREdge(false)
.drawLREdge(false)
.includeLREdge(false)
.includeTBEdge(false)
.spanCount(count)
.includeLREdge(false)
.includeTBEdge(false)
.includeTBEdge(false)
.drawTBEdge(false);
lpRecyclerView.addItemDecoration(builder.build());
}