在用户将数据放入文本框之前显示文本框焦点上的工具提示

时间:2013-05-26 07:29:34

标签: wpf xaml tooltip

我有一个基于MVVM的复杂WPF应用程序。我想为我的应用程序创建一个辅助模式。例如,我认为当用户打开屏幕并保持打开时,将打开一个自定义的tootip(在文本框上),直到用户将一些数据放入其中。当用户放置数据时,焦点将自动转移到下一个控件,并且该控件的另一个工具提示将打开,这样流程将继续。一件事,我只想在XAML中编码。任何建议朋友??? < / p>

1 个答案:

答案 0 :(得分:1)

我认为在附加属性的帮助下修改文本框的模板会更容易。

创建一个类来保存辅助附加属性。我们称之为Assistance,它将有两个附加属性:

  1. 类型为object的HelpTipContent。
  2. 类型bool的IsAssistanceActive。
  3. 然后是文本框的自定义样式/模板(基于默认的Aero主题):

    <!--Add this xmlns definition to the root of the file-->
    xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"
    ....
    <!--Then in resources-->
    <LinearGradientBrush x:Key="TextBoxBorder" EndPoint="0,20" MappingMode="Absolute" StartPoint="0,0">
        <GradientStop Color="#ABADB3" Offset="0.05"/>
        <GradientStop Color="#E2E3EA" Offset="0.07"/>
        <GradientStop Color="#E3E9EF" Offset="1"/>
    </LinearGradientBrush>
    <Style TargetType="{x:Type TextBox}">
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
        <Setter Property="BorderBrush" Value="{StaticResource TextBoxBorder}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Padding" Value="1"/>
        <Setter Property="AllowDrop" Value="true"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type TextBox}">
                    <Grid>
                        <Microsoft_Windows_Themes:ListBoxChrome x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" RenderMouseOver="{TemplateBinding IsMouseOver}" RenderFocused="{TemplateBinding IsKeyboardFocusWithin}" SnapsToDevicePixels="true">
                            <ScrollViewer x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                        </Microsoft_Windows_Themes:ListBoxChrome>
                        <Popup x:Name="AssistanceTip"
                               IsOpen="False"
                               AllowsTransparancy="True">
                            <!--TODO: Add Background/BorderBrush/BorderThicknes to this Border so it matches ToolTip style-->
                            <Border>
                                <ContentControl Content="{Binding Path=(Assistance.AssistanceTipContent), RelativeSource={RelativeSource TemplatedParent}}"/>
                            </Border>
                        </Popup>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <MultiDataTrigger>
                            <MultiDataTrigger.Conditions>
                                <Condition Binding="{Binding RelativeSource={RelativeSource Self}, IsKeyboardFocusWithin}" Value="True"/>
                                <Condition Binding="{Binding RelativeSource={RelativeSource Self}, Text}" Value=""/>
                                <Condition Binding="{Binding Path=(Assistance.IsAssistanceActive), RelativeSource={RelativeSource Self}}" Value="True"/>
                            </MultiDataTrigger.Conditions>
                            <Setter TargetName="AssistanceTip" Property="IsOpen" Value="True"/>
                        </MultiDataTrigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    

    现在您的使用将是:

    <TextBox local:Assistance.AssistanceTipContent="Some text to help the user"
             local:Assistance.IsAssistanceActive="{Binding IsAssistanceModeActive}"
             ..../>
    

    这将从样式中删除数据触发器(以查看模型数据),并使其成为非常通用的方法。

    [这里没有处理焦点的变化,我知道你已经完成了。]