为了增加用户体验,我们在打打开较大的文件,或者在一些耗时的操作中,我们可以通过增加进度条,保证更好的用户提体验
以下主要展示的是圆圈+百分比的一个加载进度模板
设计代码如下:
<Grid Panel.ZIndex="-1" Visibility="{Binding LoadingVisibility}"> <Grid.RowDefinitions> <RowDefinition Height="30"></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <Label Name="lbShow" Grid.Row="0" HorizontalAlignment="Left" Margin="38,5,0,0" VerticalAlignment="Top" RenderTransformOrigin="-0.375,0.3"/> <ProgressBar Name="pbBar" Grid.Row="1" Minimum="0" Maximum="100" Value="{Binding LoaddingPercent, Mode=OneWay}" Height="120" Width="120" > <ProgressBar.Template> <ControlTemplate TargetType="ProgressBar"> <Border Background="{TemplateBinding Value, Converter={StaticResource ValueToProcessConverter}, ConverterParameter=200}"/> </ControlTemplate> </ProgressBar.Template> </ProgressBar> </Grid>
我们需要将数据转换成ProgressBar的需要的值,因此需要转换器,代码如下
public class ValueToProcessConverter : IValueConverter { private const double Thickness = 8; private const double Padding = 1; private const double WarnValue = 60; private const int SuccessRateFontSize = 34; private static readonly SolidColorBrush NormalBrush; private static readonly SolidColorBrush WarnBrush; private static readonly Typeface SuccessRateTypeface; private string percentString; private Point centerPoint; private double radius; static ValueToProcessConverter() { NormalBrush = new SolidColorBrush(Colors.Green); WarnBrush = new SolidColorBrush(Colors.Red); SuccessRateTypeface = new Typeface(new FontFamily("MSYH"), new FontStyle(), new FontWeight(), new FontStretch()); } public ValueToProcessConverter() { } public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value is double && !string.IsNullOrEmpty((string)parameter)) { double arg = (double)value; double width = double.Parse((string)parameter); radius = width / 2; centerPoint = new Point(radius, radius); return DrawBrush(arg, 100, radius, radius, Thickness, Padding); } else { throw new ArgumentException(); } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } /// <summary> /// 根据角度获取坐标 /// </summary> /// <param name="CenterPoint"></param> /// <param name="r"></param> /// <param name="angel"></param> /// <returns></returns> private Point GetPointByAngel(Point CenterPoint, double r, double angel) { Point p = new Point(); p.X = Math.Sin(angel * Math.PI / 180) * r + CenterPoint.X; p.Y = CenterPoint.Y - Math.Cos(angel * Math.PI / 180) * r; return p; } /// <summary> /// 根据4个坐标画出扇形 /// </summary> /// <param name="bigFirstPoint"></param> /// <param name="bigSecondPoint"></param> /// <param name="smallFirstPoint"></param> /// <param name="smallSecondPoint"></param> /// <param name="bigRadius"></param> /// <param name="smallRadius"></param> /// <param name="isLargeArc"></param> /// <returns></returns> private Geometry DrawingArcGeometry(Point bigFirstPoint, Point bigSecondPoint, Point smallFirstPoint, Point smallSecondPoint, double bigRadius, double smallRadius, bool isLargeArc) { PathFigure pathFigure = new PathFigure { IsClosed = true }; pathFigure.StartPoint = bigFirstPoint; pathFigure.Segments.Add( new ArcSegment { Point = bigSecondPoint, IsLargeArc = isLargeArc, Size = new Size(bigRadius, bigRadius), SweepDirection = SweepDirection.Clockwise }); pathFigure.Segments.Add(new LineSegment { Point = smallSecondPoint }); pathFigure.Segments.Add( new ArcSegment { Point = smallFirstPoint, IsLargeArc = isLargeArc, Size = new Size(smallRadius, smallRadius), SweepDirection = SweepDirection.Counterclockwise }); PathGeometry pathGeometry = new PathGeometry(); pathGeometry.Figures.Add(pathFigure); return pathGeometry; } /// <summary> /// 根据当前值和最大值获取扇形 /// </summary> /// <param name="value"></param> /// <param name="maxValue"></param> /// <returns></returns> private Geometry GetGeometry(double value, double maxValue, double radiusX, double radiusY, double thickness, double padding) { bool isLargeArc = false; double percent = value / maxValue; percentString = string.Format("{0}%", Math.Round(percent * 100)); double angel = percent * 360D; if (angel > 180) isLargeArc = true; double bigR = radiusX; double smallR = radiusX - thickness + padding; Point firstpoint = GetPointByAngel(centerPoint, bigR, 0); Point secondpoint = GetPointByAngel(centerPoint, bigR, angel); Point thirdpoint = GetPointByAngel(centerPoint, smallR, 0); Point fourpoint = GetPointByAngel(centerPoint, smallR, angel); return DrawingArcGeometry(firstpoint, secondpoint, thirdpoint, fourpoint, bigR, smallR, isLargeArc); } private void DrawingGeometry(DrawingContext drawingContext, double value, double maxValue, double radiusX, double radiusY, double thickness, double padding) { if (value != maxValue) { SolidColorBrush brush; if (value < WarnValue) { brush = WarnBrush; } else { brush = NormalBrush; } drawingContext.DrawEllipse(null, new Pen(new SolidColorBrush(Color.FromRgb(0xdd, 0xdf, 0xe1)), thickness), centerPoint, radiusX, radiusY); drawingContext.DrawGeometry(brush, new Pen(), GetGeometry(value, maxValue, radiusX, radiusY, thickness, padding)); FormattedText formatWords = new FormattedText(percentString, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, SuccessRateTypeface, SuccessRateFontSize, brush); Point startPoint = new Point(centerPoint.X - formatWords.Width / 2, centerPoint.Y - formatWords.Height / 2); drawingContext.DrawText(formatWords, startPoint); } else { drawingContext.DrawEllipse(null, new Pen(NormalBrush, thickness), centerPoint, radiusX, radiusY); FormattedText formatWords = new FormattedText("100%", CultureInfo.CurrentCulture, FlowDirection.LeftToRight, SuccessRateTypeface, SuccessRateFontSize, NormalBrush); Point startPoint = new Point(centerPoint.X - formatWords.Width / 2, centerPoint.Y - formatWords.Height / 2); drawingContext.DrawText(formatWords, startPoint); } drawingContext.Close(); } /// <summary> /// 根据当前值和最大值画出进度条 /// </summary> /// <param name="value"></param> /// <param name="maxValue"></param> /// <returns></returns> private Visual DrawShape(double value, double maxValue, double radiusX, double radiusY, double thickness, double padding) { DrawingVisual drawingWordsVisual = new DrawingVisual(); DrawingContext drawingContext = drawingWordsVisual.RenderOpen(); DrawingGeometry(drawingContext, value, maxValue, radiusX, radiusY, thickness, padding); return drawingWordsVisual; } /// <summary> /// 根据当前值和最大值画出进度条 /// </summary> /// <param name="value"></param> /// <param name="maxValue"></param> /// <returns></returns> private Brush DrawBrush(double value, double maxValue, double radiusX, double radiusY, double thickness, double padding) { DrawingGroup drawingGroup = new DrawingGroup(); DrawingContext drawingContext = drawingGroup.Open(); DrawingGeometry(drawingContext, value, maxValue, radiusX, radiusY, thickness, padding); DrawingBrush brush = new DrawingBrush(drawingGroup); return brush; } }
对应的viewModel中只需要添加对应的属性
/// <summary> /// propfull /// 加载进度 /// </summary> private double loaddingPercent; public double LoaddingPercent { get { return loaddingPercent; } set { loaddingPercent = value; OnPropertyChanged(); } }
最终效果如下: