void Initialize()
{
var container = new Grid
{
HorizontalOptions = LayoutOptions.Start,
VerticalOptions = LayoutOptions.Start,
RowSpacing = 0,
Margin = new Thickness(6)
};
_background = new Rectangle
{
Fill = Brush.Transparent,
HeightRequest = 18,
WidthRequest = 18,
RadiusX = 2,
RadiusY = 2,
Stroke = Color,
StrokeThickness = 2
};
_glyph = new Path
{
Aspect = Stretch.Uniform,
Stroke = Brush.White,
StrokeThickness = 1,
HorizontalOptions = LayoutOptions.Center,
VerticalOptions = LayoutOptions.Center,
HeightRequest = 14,
WidthRequest = 14,
Opacity = 0,
Margin = new Thickness(2)
};
var pathGeometryConverter = new PathGeometryConverter();
if (_glyph is Path path && pathGeometryConverter.ConvertFromInvariantString("M30.561941,0L31.997,1.393004 10.467954,23.597999 0,15.350999 1.2379759,13.780992 10.287961,20.909952z") is Geometry data)
{
path.Data = data;
}
container.Children.Add(_background);
container.Children.Add(_glyph);
Content = container;
_tapGestureRecognizer = new TapGestureRecognizer();
UpdateIsEnabled();
}
public Geometry ProvideValue(IServiceProvider serviceProvider)
{
return(PathGeometryConverter.ConvertFromInvariantString(Path) as Geometry);
}
void start()
{
for (int i = 0; i < 10; i++)
{
var p = new Xamarin.Forms.Shapes.Path();
p.Aspect = Stretch.None;
mPathList.Add(p);
this.Children.Add(p);
p.Data = (Geometry)mGeometryConverter.ConvertFromInvariantString("M 0,20 L 0.8,19 L 10,19 L 10,21 L 0.8,21 Z"); // XamarinForms 版本貌似不能显示负数的内容, 故起始由9点方位的横线开始
p.Stroke = new SolidColorBrush(Color.White);
p.Fill = new SolidColorBrush(Color.White);
p.Opacity = mMinOpacity;
var tg = new TransformGroup();
// TransformGroup 需要进行 2个步骤
// 1 向上位移 50 ==> Y = -50;
// 2 旋转一定角度, 让 12 个 Path 组成一个圆 ==> Angle = i * 30;
var tt = new TranslateTransform();
// tt.Y = -13; // WPF
tt.X = 2; // 可以调整的范围 0 ~ 5
tg.Children.Add(tt);
var rt = new RotateTransform();
rt.Angle = i * 36; // 360 / 10 = 36
rt.CenterX = 20; // XamarinForms 版本貌似不能显示负数的内容, 故起始由9点方位的横线开始, 所以旋转以 20, 20 为中心
rt.CenterY = 20; // XamarinForms 版本貌似不能显示负数的内容, 故起始由9点方位的横线开始, 所以旋转以 20, 20 为中心
tg.Children.Add(rt);
var st = new ScaleTransform();
mSTList.Add(st); // 程序员可以调整缩放
st.ScaleX = 1;
st.ScaleY = 1;
tg.Children.Add(st);
p.RenderTransform = tg;
//var ani = new DoubleAnimation();
//ani.From = mMaxOpacity;
//ani.To = mMinOpacity;
//ani.Duration = new Duration(TimeSpan.FromSeconds(1));
//// 为了实现依次闪烁, 错开每个动画的开始时间
//ani.BeginTime = TimeSpan.FromMilliseconds(i * 1000 / 12);
//ani.RepeatBehavior = System.Windows.Media.Animation.RepeatBehavior.Forever;
//p.BeginAnimation(System.Windows.Shapes.Path.OpacityProperty, ani);
Animation mStoryboard = new Animation();
// double total = 6000d;
double total = 1000d;
double k1 = i * 100d / total;
// 等待动画开始执行
if (i > 0)
{
Animation s1 = new Animation
(
callback: v => p.Opacity = v,
start: mMinOpacity,
end: mMinOpacity,
easing: Easing.Linear,
finished: null
);
mStoryboard.Add
(
beginAt: 0,
finishAt: k1,
animation: s1
);
}
// 动画开始执行
Animation s2 = new Animation
(
callback: v => p.Opacity = v,
start: mMaxOpacity,
end: mMinOpacity,
easing: Easing.Linear,
finished: null
);
mStoryboard.Add
(
beginAt: k1,
finishAt: 1,
animation: s2
);
mStoryboard.Commit
(
owner: p,
name: AnimationName,
rate: 16,
length: uint.Parse(total.ToString()),
easing: Easing.Linear,
finished: null,
repeat: () => { return(true); }
);
mAnimationList.Add(mStoryboard);
}
}
