| ■100718 / inTopicNo.1) |
MultiBinding で Path を生成出来ない。。。 |
□投稿者/ 雲 (6回)-(2022/10/21(Fri) 20:27:31)
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分類:[.NET 全般]
MultiBindingを使って Path で図形を描画しようとしていますが、何故か、全く描画されません。
ただの Binding なら問題な図形が描画されるのですが。。。
やっていることは、Resource でIMultiValueConverterを定義して "M 50 0 A 100 50 45 1 0 200 100" を戻しているだけです。
何か気がつくことがあれば、ご指摘頂けると助かります。
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windows.xaml
==============================================================
<Window x:Class="ProgressBarControlTemplate.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:ProgressBarControlTemplate"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<ControlTemplate x:Key="templateThermometer" TargetType="{x:Type ProgressBar}">
<ControlTemplate.Resources>
<local:PathCreator x:Key="BoolToVisible"/>
<local:xxxConverter x:Key="xxxConverter"/>
</ControlTemplate.Resources>
<Canvas>
<Path Stroke="Red" StrokeThickness="5">
<Path.Data>
<MultiBinding Converter="{StaticResource xxxConverter}">
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType=Canvas}" Path="ActualWidth"/>
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType=Canvas}" Path="ActualHeight"/>
</MultiBinding>
</Path.Data>
</Path>
<Path Stroke="Blue" StrokeThickness="5">
<Path.Data>
<Binding Converter="{StaticResource BoolToVisible}"/>
</Path.Data>
</Path>
</Canvas>
</ControlTemplate>
</Window.Resources>
<Grid>
<ProgressBar Template="{StaticResource templateThermometer}" Width="100" Height="300" Value="60" Orientation="Vertical"/>
</Grid>
</Window>
==============================================================
windows.xaml.cs
==============================================================
public class xxxConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
// var a = values.Aggregate((lhs, rhs) => String.Format("{0}:{1}", lhs, rhs));
return( "M 50 0 A 100 50 45 1 0 200 100" );
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
return null;
}
}
public class PathCreator : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
/*
if(value != null)
{
var path = "M 50,0 A 100,50 45 1 0 200,";
path += value.ToString();
return( path );
}
*/
return( "M 50 100 A 100 50 45 1 0 200 100" );
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
string s = value as string;
if (s != null)
{
int result;
bool isOK = int.TryParse(s, out result);
if (isOK)
{
return result;
}
}
return null;
}
}
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