WPF工具提示可见性

Question

如何确保按钮的工具提示仅在禁用按钮时可见？

我可以将工具提示的可见性绑定到什么？

Answer 1

您需要在Button 上将ToolTipService.ShowOnDisabled设置为True,以便在禁用Button时让Tooltip可见.您可以在Button上绑定ToolTipService.IsEnabled以启用和禁用Tooltip.

Answer 2

这是Button的完整XAML(基于@Quartermeister的答案)

<Button 
  x:Name="btnAdd" 
  Content="Add" 
  ToolTipService.ShowOnDisabled="True" 
  ToolTipService.IsEnabled="{Binding ElementName=btnAdd, Path=IsEnabled, Converter={StaticResource boolToOppositeBoolConverter}}" 
  ToolTip="Appointments cannot be added whilst the event has outstanding changes."/>

Answer 3

您也可以使用简单的触发器来完成.只需将以下代码放入Window即可.

<StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center">
    <CheckBox Name="chkDisabler" Content="Enable / disable button" Margin="10" />
    <Button Content="Hit me" Width="200" Height="100" IsEnabled="{Binding ElementName=chkDisabler, Path=IsChecked}">
        <Button.Style>
            <Style TargetType="{x:Type Button}">
                <Setter Property="ToolTipService.ShowOnDisabled" Value="true" />
                <Setter Property="ToolTip" Value="{x:Null}" />
                <Style.Triggers>
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter Property="ToolTip" Value="Hi, there! I'm disabled!" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </Button.Style>
    </Button>
</StackPanel>

Answer 4

对大卫·沃德提出的答案略有修改。这是完整的代码

像这样向资源添加一个值转换器

<Window.Resources>
    <Converters:NegateConverter x:Key="negateConverter"/>
</Window.Resources>

然后定义以下xaml

<Button 
  x:Name="btnAdd" 
  Content="Add" 
  ToolTipService.ShowOnDisabled="True" 
  ToolTipService.IsEnabled="{Binding RelativeSource={RelativeSource self}, Path=IsEnabled, Converter={StaticResource negateConverter}}" 
  ToolTip="Hi guys this is the tool tip"/>

值转换器看起来像这样

[ValueConversion(typeof(bool), typeof(bool))]
  public class NegateConverter : IValueConverter
  {
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
     return  !((bool)value);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      throw new NotImplementedException();
    }
  }