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android - 在网格中添加 OxyPlot View

转载 作者:太空狗 更新时间:2023-10-29 13:18:51 30 4
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我有这个类,它继承了ContentPage

public class MainPage : ContentPage
{

public Label lblTime { get; set; }

public Grid grid { get; set; }

public MainPage ()
{

//some code which doesn't matter

lblTime = new Label {
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.CenterAndExpand,
Text = currentTime
};

Grid grid = new Grid
{
VerticalOptions = LayoutOptions.FillAndExpand,
RowDefinitions =
{
new RowDefinition { Height = new GridLength(40, GridUnitType.Auto) },
new RowDefinition { Height = new GridLength() }
},
ColumnDefinitions =
{
new ColumnDefinition { Width = new GridLength(50, GridUnitType.Auto) },
new ColumnDefinition { Width = new GridLength(50, GridUnitType.Star) }
}
};

grid.Children.Add (lblTime, 0, 1, 0, 1);

Content = new StackLayout {
Children = {
grid
}
};
}
}

我也有这个类,它绘制图形:

public class DrawGraph
{
public PlotModel MyModel { get; set; }

public DrawGraph ()
{

var plotModel = new PlotModel {};

plotModel.Title = "Test";

var xaxis = new LinearAxis {
Position = AxisPosition.Bottom
};

var yaxis = new LinearAxis {
Position = AxisPosition.Left
};

yaxis.TickStyle = OxyPlot.Axes.TickStyle.Inside;
xaxis.MinorTickSize = 20;
yaxis.TicklineColor = OxyColors.Blue;

plotModel.Axes.Add (xaxis);
plotModel.Axes.Add (yaxis);

var series1 = new LineSeries {
StrokeThickness = 3,
MarkerType = MarkerType.Circle,
MarkerSize = 4,
MarkerStroke = OxyColors.LimeGreen,
MarkerStrokeThickness = 1
};

double[,] chartValues = new double[,] {{1437041279684.0156,1.0897299999999999},{1437041339421.4324,1.0896},{1437041397111.7322,1.0897100000000002},{1437041458595.2488,1.0898599999999998},{1437041519510.7329,1.08992},{1437041578914.1306,1.08983},{1437041639357.5877,1.0895100000000002},{1437041699721.0405,1.0895299999999999},{1437041758381.3958,1.0895000000000001},{1437041818605.84,1.08954},{1437041879932.3479,1.0894400000000002},{1437041939531.7568,1.08902}};

for (int i = 0; i < chartValues.GetLength(0)/2; i++) {
series1.Points.Add (new DataPoint (chartValues[i,0],chartValues[i,1]));
}

plotModel.Series.Add (series1);

this.MyModel = plotModel;
}
}

我的问题是,如何调用 DrawGraph 类并将它生成的 View 放在网格单元格中?我想这类似于从 DrawGraph 类调用生成的 plotView,如下所示:grid.Children.Add (plotView, 0, 1, 1, 2);但我想不通。

最佳答案

您好,最好的方法是使用绑定(bind)将您的 View Hook 到您的 View 模型。 PlotView 到 DrawGraph

在这种情况下,您必须进行以下更改:

在您的 ContentPage 中,我们必须创建一个 PlotView 并将其添加到网格中,这是图表渲染器的位置,

var graph = new PlotView ();
grid.Children.Add (graph, 0, 0, 1, 0);

接下来我们必须告诉图表我们要绑定(bind)什么,在这种情况下,我们将 ModelProperty 绑定(bind)到 ViewModel(我们的 DrawGraph 类)上的 MyModel,我们还需要将页面的 BindingContext 设置为新的 DrawGraph 实例。

graph.SetBinding(PlotView.ModelProperty, new Binding ("MyModel"));
this.BindingContext = new DrawGraph ();

我们的 DrawGraph 类需要进行一些更改,以便能够正确更新 UI,我们需要实现 INPC 接口(interface)。所以我们添加这个:

public class DrawGraph : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;

public void OnPropertyChaged([CallerMemberName]string caller = null){
var handler = PropertyChanged;
if (handler != null) {
handler(this, new PropertyChangedEventArgs(caller));
}
}

我们需要更改我们的属性 setter 以在更改时通知:

PlotModel myModel;
public PlotModel MyModel {
get{ return myModel; }
set {
myModel = value;
OnPropertyChaged ();
}
}

这应该是您获得图表渲染所需要的。

每次您设置新的 MyModel 属性时,它都会更新 UI。

关于android - 在网格中添加 OxyPlot View ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31540841/

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