showToast static method

Implementation

static Future<bool> showToast(
  BuildContext context, {
  //显示的文本
  required String msg,
  //显示的时间 单位毫秒
  int showTime = 1000,
  //显示的背景
  Color bgColor = Colors.black,
  //显示的文本颜色
  Color textColor = Colors.white,
  //显示的文字大小
  double textSize = 14.0,
  //显示的位置
  ToastPostion position = ToastPostion.bottom,
  //文字水平方向的内边距
  double pdHorizontal = 20.0,
  //文字垂直方向的内边距
  double pdVertical = 10.0,
}) async {
  _msg = msg;
  _startedTime = DateTime.now();
  _showTime = showTime;
  _bgColor = bgColor;
  _textColor = textColor;
  _textSize = textSize;
  _toastPosition = position;
  _pdHorizontal = pdHorizontal;
  _pdVertical = pdVertical;
  // 获取OverlayState
  OverlayState overlayState = Overlay.of(context);
  _showing = true;
  if (_overlayEntry == null) {
    // OverlayEntry负责构建布局
    // 通过OverlayEntry将构建的布局插入到整个布局的最上层
    _overlayEntry = OverlayEntry(
      builder: (BuildContext context) => Positioned(
        // top值，可以改变这个值来改变toast在屏幕中的位置
        top: buildToastPosition(context),
        child: Semantics(
          label: 'jhdebug_JhToast',
          child: Container(
            alignment: Alignment.center,
            width: MediaQuery.of(context).size.width,
            child: Padding(
              padding: EdgeInsets.symmetric(horizontal: 40.0),
              child: AnimatedOpacity(
                opacity: _showing ? 0.7 : 0.0, // 目标透明度
                duration: _showing
                    ? Duration(milliseconds: 100)
                    : Duration(milliseconds: 400),
                child: _buildToastWidget(),
              ),
            ),
          ),
        ),
      ),
    );

    // 插入到整个布局的最上层
    overlayState.insert(_overlayEntry!);
  } else {
    _overlayEntry?.markNeedsBuild();
  }

  /// 等待时间
  await Future.delayed(Duration(milliseconds: _showTime!));
  // 2秒后消失
  if (DateTime.now().difference(_startedTime).inMilliseconds >= _showTime!) {
    _showing = false;
    _overlayEntry?.markNeedsBuild();
    await Future.delayed(Duration(milliseconds: 400));
    _overlayEntry?.remove();
    _overlayEntry = null;
  }
  return true;
}