Android 中 SwipeLayout一个展示条目底层菜单的侧滑控件源码解析

由于项目上的需要侧滑条目展示收藏按钮,记得之前代码家有写过一个厉害的开源控件 androidswipelayout 本来准备直接拿来使用,但是看过 issue 发现现在有不少使用者反应有不少的 bug ,而且代码家现在貌似也不进行维护了.故自己实现了一个所要效果的一个控件.因为只是实现我需要的效果,所以大家也能看到,代码里有不少地方我是写死的.希望对大家有些帮助.而且暂时也不需要 androidswipelayout 大而全的功能,算是变相给自己做的项目精简代码了.

完整示例代码请看:github 地址

主要源码:

public class swipelayout extends framelayout {
public static final int close = 0;
public static final int open = 1;
private int mstate = close;
private int mwidth;
private int mheight;
private float mdownx;
private float mdowny;
private swipelistener mswipelistener;
private view mtopview;
private view mbottomview;
private viewdraghelper mviewdraghelper;
public swipelayout(context context) {
this(context, null);
}
public swipelayout(context context, attributeset attrs) {
this(context, attrs, 0);
}
public swipelayout(context context, attributeset attrs, int defstyleattr) {
super(context, attrs, defstyleattr);
mviewdraghelper = viewdraghelper.create(this, new viewdraghelper.callback() {
@override
public boolean trycaptureview(view child, int pointerid) {//只对mtopview进行处理
return child == mtopview;
}
@override
public int clampviewpositionhorizontal(view child, int left, int dx) {//设置横向滑动的边界(left的值是mtopview左上角点的x坐标值)
int newleft;
if (left <= -mbottomview.getmeasuredwidth()) {
newleft = -mbottomview.getmeasuredwidth();
} else if (left >= 0) {
newleft = 0;
} else {
newleft = left;
}
return newleft;
}
@override
public int clampviewpositionvertical(view child, int top, int dy) {//因为不需要上下的滑动直接设置为0(top的值是mtopview左上角点的y坐标值)
return 0;
}
@override
public void onviewreleased(view releasedchild, float xvel, float yvel) {//手指松开时会回调该函数
int right = mwidth - releasedchild.getright();//mtopview右边界距离屏幕右边的距离
int bottomwidth = mbottomview.getmeasuredwidth();
if (right > bottomwidth * 9 / 10) {
scrolltoleftedge();
return;
}
if (right <= bottomwidth / 10 && right > 0) {
scrolltorightedge();
return;
}
if (xvel == 0) {//速度为0时单独处理
if (right >= bottomwidth / 2) {
scrolltoleftedge();
} else if (right < bottomwidth / 2) {
scrolltorightedge();
}
return;
}
if (xvel > 0) {//向右滑动后松手
scrolltorightedge();
} else {//向左滑动后松手
scrolltoleftedge();
}
}
});
}
@override
public void computescroll() {
if (mviewdraghelper.continuesettling(true)) {
invalidate();
}
}
@override
public boolean onintercepttouchevent(motionevent ev) {
switch (ev.getaction()) {
case motionevent.action_down:
mdownx = ev.getrawx();
mdowny = ev.getrawy();
if (mstate == close) {
return true;
}
break;
case motionevent.action_move:
float distancex = ev.getrawx() - mdownx;
float distancey = ev.getrawy() - mdowny;
float angle;
if (distancex == 0) {
angle = 90;
} else {
angle = (float) math.todegrees(math.atan(math.abs(distancey / distancex)));
}
if (angle < 45) {
return true;//拦截事件交给自己处理滑动
}
break;
}
return mviewdraghelper.shouldintercepttouchevent(ev);
}
@override
public boolean ontouchevent(motionevent ev) {
viewparent viewparent = getparent();
switch (ev.getaction()) {
case motionevent.action_down:
mdownx = ev.getrawx();
mdowny = ev.getrawy();
break;
case motionevent.action_move:
float distancex = ev.getrawx() - mdownx;
float distancey = ev.getrawy() - mdowny;
float angle;
if (distancex == 0) {
angle = 90;
} else {
angle = (float) math.todegrees(math.atan(math.abs(distancey / distancex)));
}
if (angle < 45 && viewparent != null) {
viewparent.requestdisallowintercepttouchevent(true);//让父控件不要处理事件,交给子控件
}
break;
case motionevent.action_cancel:
case motionevent.action_up:
if (viewparent != null) {
viewparent.requestdisallowintercepttouchevent(false);
}
break;
}
mviewdraghelper.processtouchevent(ev);
return true;
}
@override
protected void onlayout(boolean changed, int l, int t, int r, int b) {
super.onlayout(changed, l, t, r, b);
int measureheight = mbottomview.getmeasuredheight();
int measurewidth = mbottomview.getmeasuredwidth();
mbottomview.layout(mwidth - measurewidth, (mheight - measureheight) / 2, mwidth, mheight + measureheight / 2);//靠右边界垂直居中
if (mstate == open) {
mtopview.layout(-measurewidth, 0, mtopview.getmeasuredwidth() - measurewidth, mtopview.getmeasuredheight());
}
}
@override
protected void onsizechanged(int w, int h, int oldw, int oldh) {
super.onsizechanged(w, h, oldw, oldh);
mwidth = w;
mheight = h;
}
@override
protected void onfinishinflate() {
super.onfinishinflate();
if (getchildcount() != 2) {
throw new illegalstateexception("only and should contain two child view");
}
view bottomview = getchildat(0);
if (!(bottomview instanceof viewgroup)) {
throw new illegalstateexception("sideslip menu should be contained by a viewgroup");
}
mbottomview = bottomview;
mtopview = getchildat(1);
}
//回滚到左边(只能在onviewreleased里使用该方法)
private void scrolltoleftedge() {
mviewdraghelper.settlecapturedviewat(-mbottomview.getmeasuredwidth(), 0);
invalidate();
mstate = open;
if (mswipelistener != null) {
mswipelistener.onopenlistener(this);
}
}
//回滚到右边(只能在onviewreleased里使用该方法)
private void scrolltorightedge() {
mviewdraghelper.settlecapturedviewat(0, 0);
invalidate();
mstate = close;
}
public void smoothclose() {
mviewdraghelper.smoothslideviewto(mtopview, 0, 0);
invalidate();
mstate = close;
}
public int getstate() {
return mstate;
}
public void setstate(int state) {
mstate = state;
invalidate();
}
public interface swipelistener {
void onopenlistener(swipelayout swipelayout);
}
public void setswipelistener(swipelistener mswipelistener) {
this.mswipelistener = mswipelistener;
}
}

效果图

以上所述是小编给大家介绍的android 中 swipelayout一个展示条目底层菜单的侧滑控件源码解析，希望对大家有所帮助