回答編集履歴
2
動画入れ替え
answer
CHANGED
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@@ -124,4 +124,4 @@
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124
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=> throw new NotImplementedException();
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125
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}
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```
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127
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-
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1
簡単な例 追加
answer
CHANGED
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@@ -22,6 +22,7 @@
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22
22
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Height="200">
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23
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<Window.Resources>
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<local:MultiValueEqualityConverter x:Key="multiValueEqualityConverter" />
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25
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+
<local:LessThanConverter x:Key="lessThanConverter" />
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</Window.Resources>
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<DockPanel>
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<Button
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@@ -50,12 +51,42 @@
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</Style>
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</Button.Style>
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</Button>
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+
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55
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+
<!-- こういうのもあり -->
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+
<Button
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Margin="10"
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Command="ScrollBar.PageRightCommand"
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CommandTarget="{Binding ElementName=ScrollViewerA}"
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Content="PageRight"
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DockPanel.Dock="Bottom">
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<Button.IsEnabled>
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<MultiBinding Converter="{StaticResource lessThanConverter}">
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64
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<Binding ElementName="ScrollViewerA" Path="HorizontalOffset" />
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65
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<Binding ElementName="ScrollViewerA" Path="ScrollableWidth" />
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</MultiBinding>
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</Button.IsEnabled>
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68
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+
<Button.Style>
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69
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<Style TargetType="Button">
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70
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<Style.Triggers>
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71
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<Trigger Property="IsEnabled" Value="True">
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72
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<Setter Property="Effect">
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73
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<Setter.Value>
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<DropShadowEffect BlurRadius="20" ShadowDepth="0" Color="Blue" />
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</Setter.Value>
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</Setter>
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</Trigger>
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</Style.Triggers>
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</Style>
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</Button.Style>
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</Button>
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+
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53
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<ScrollViewer x:Name="ScrollViewerA" HorizontalScrollBarVisibility="Visible">
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<TextBlock Text="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" />
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</ScrollViewer>
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</DockPanel>
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</Window>
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```
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89
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+
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59
90
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```cs
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60
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using System.Globalization;
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using System.Windows;
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@@ -72,10 +103,25 @@
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72
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// [.net - Using binding for the Value property of DataTrigger condition - Stack Overflow](https://stackoverflow.com/questions/2240421/using-binding-for-the-value-property-of-datatrigger-condition)
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public class MultiValueEqualityConverter : IMultiValueConverter
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{
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75
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-
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
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106
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+
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
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76
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=> values?.All(o => o?.Equals(values[0]) == true) == true || values?.All(o => o == null) == true;
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-
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
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108
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+
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
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=> throw new NotImplementedException();
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}
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111
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+
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112
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+
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public class LessThanConverter : IMultiValueConverter
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114
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{
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115
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public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
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{
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var d1 = (double)values[0]; // HorizontalOffset
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var d2 = (double)values[1]; // ScrollableWidth
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119
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//スクロール位置が右端に到達していなかったら(まだスクロールできる状態であれば)
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120
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return d1 < d2;
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121
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}
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122
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+
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123
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+
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
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124
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+
=> throw new NotImplementedException();
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125
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+
}
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80
126
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```
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81
127
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