@bg-dark: #efeff4;
@progress-color: #08bf06;

@height: 48px;
@fontColor: darken(@bg-dark, 40%); // state hint
@btnColor: darken(@bg-dark, 60%); // load more

@pullingMsg: "下拉刷新";
@pullingEnoughMsg: "松开刷新";
@refreshingMsg: "正在刷新...";
@refreshedMsg: "刷新成功";
@loadingMsg: "正在加载...";
@btnLoadMore: "点击加载更多";
@transition-duration: 0.2s;

.tloader-msg:after {
  content: @pullingMsg;

  .state-pulling.enough & {
    content: @pullingEnoughMsg;
  }

  .state-refreshed & {
    content: @refreshedMsg;
  }
}
.tloader-loading:after {
  content: @loadingMsg;

  .tloader-symbol & {
    content: @refreshingMsg;
  }
}
.tloader-btn:after {
  content: @btnLoadMore;
}

.tloader {
  position: relative;
  font-size: 14px;
}

.state-pulling {
  overflow-y: hidden !important; // 拖拽时临时阻止ios的overscroll
}

// pull to refresh
.tloader-symbol {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  color: @fontColor;
  text-align: center;
  height: @height;
  overflow: hidden;

  // 隐藏刷新提示标签
  .state- &,
  .state-reset & {
    height: 0;
  }
  // 延迟至reset完成，隐藏刷新提示标签
  .state-reset & {
    transition: height 0s @transition-duration;
  }

  // hide when loading more
  .state-loading & {
    display: none;
  }
}

// 拖拽提示信息
.tloader-msg {
  line-height: @height;

  i {
    // arrow down icon
    .state-pulling &,
    .state-reset & {
      display: inline-block;
      font-size: 2em;
      margin-right: 0.6em;
      vertical-align: middle;
      height: 1em;
      border-left: 1px solid;
      position: relative;
      transition: transform 0.3s ease;

      &:before,
      &:after {
        content: "";
        position: absolute;
        font-size: 0.5em;
        width: 1em;
        bottom: 0px;
        border-top: 1px solid;
      }
      &:before {
        right: 1px;
        transform: rotate(50deg);
        transform-origin: right;
      }
      &:after {
        left: 0px;
        transform: rotate(-50deg);
        transform-origin: left;
      }
    }

    // arrow up
    .state-pulling.enough & {
      transform: rotate(180deg);
    }
  }

  // 刷新中，隐藏提示信息 以切换至loading动画
  .state-refreshing & {
    height: 0;
    opacity: 0;
  }
  // 刷新成功提示消息
  .state-refreshed & {
    opacity: 1;
    transition: opacity 1s;

    // √ icon
    i {
      display: inline-block;
      box-sizing: content-box;
      vertical-align: middle;
      margin-right: 10px;
      font-size: 20px;
      height: 1em;
      width: 1em;
      border: 1px solid;
      border-radius: 100%;
      position: relative;

      &:before {
        content: "";
        position: absolute;
        top: 3px;
        left: 7px;
        height: 11px;
        width: 5px;
        border: solid;
        border-width: 0 1px 1px 0;
        transform: rotate(40deg);
      }
    }
  }
}

.tloader-body {
  // active the scrollbar of ios
  margin-top: -1px;
  padding-top: 1px;

  .state-refreshing & {
    transform: translate3d(0, @height, 0);
    transition: transform @transition-duration;
  }

  .state-refreshed & {
    // handle resolve within .3s
    animation: refreshed @transition-duration*2;
  }

  .state-reset & {
    transition: transform @transition-duration;
  }
}
@keyframes refreshed {
  0% {
    transform: translate3d(0, @height, 0);
  }
  50% {
    transform: translate3d(0, @height, 0);
  }
}

// touch to load more
.tloader-footer {
  .state-refreshing & {
    display: none;
  }

  .tloader-btn {
    color: @btnColor;
    text-align: center;
    line-height:  @height;

    .state-loading & {
      display: none;
    }
  }
}

.tloader-loading {
  display: none;
  text-align: center;
  line-height: @height;
  color: @fontColor;

  .ui-loading {
    font-size: 20px;
    margin-right: 9px;
  }

  .state-refreshing .tloader-symbol &,
  .state-loading .tloader-footer & {
    display: block;
  }
}

// loading效果
@keyframes circle {
  100% {
    transform: rotate(360deg);
  }
}
.ui-loading {
  display: inline-block;
  vertical-align: middle;
  font-size: 12px;
  width: 1em;
  height: 1em;
  border: 2px solid darken(@bg-dark, 30%);
  border-top-color: rgba(255,255,255,0.4);
  border-radius: 100%;
  animation: circle 0.8s infinite linear;

  #ui-waiting & {
    border: 2px solid #fff;
    border-top-color: darken(@bg-dark, 30%);
  }
}

// 进度条加载效果
@keyframes tloader-progressing {
  0% {
    width: 0;
  }
  10% {
    width: 40%;
  }
  20% {
    width: 75%;
  }
  30% {
    width: 95%;
  }
}
@keyframes tloader-progressed {
  0% {
    opacity: 1;
  }
}
.tloader-progress {
  position: relative;

  &:before {
    content: "";
    z-index: 1000;
    position: absolute;
    top: 0;
    left: 0;
    height: 2px;
    background-color: @progress-color;
    width: 99%;
    animation: tloader-progressing 9s ease-out;

    .ed& {
      opacity: 0;
      width: 100%;
      animation: tloader-progressed 1s;
    }
  }
}
