DecimalUpDown(扩展的WPF工具包)-仅在丢失焦点时更新源代码

本文关键字：焦点 源代码 更新 扩展 WPF 工具包 DecimalUpDown | 更新日期: 2023-09-27 18:09:41

我正在使用扩展WPF工具包的DecimalUpDown控件，其Value属性绑定到十进制?如下:

   <extToolkit:DecimalUpDown Value="{Binding BlahBlah, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ShowButtonSpinner="False" />
private Decimal? blahblah = 5;
    public Decimal? BlahBlah
    {
        get { return blahblah; }
        set { blahblah = value; }
    }

我注意到，当我在文本框中键入数字时，值不会更新，直到我单击控件外部。它的ValueChanged事件也不会被触发，直到我点击外部。

我打算在用户更改值时立即更新值(即实时)。有办法做到这一点吗?

DecimalUpDown(扩展的WPF工具包)-仅在丢失焦点时更新源代码

是的，您必须将控件模板替换为具有UpdateSourceTrigger=PropertyChanged的模板。去年我复制了现有的模板，进行了修改，然后在我的控件中使用它。新资源:

        <ControlTemplate x:Key="newDecimalUpDownTemplate" 
                     TargetType="{x:Type Control}">
        <extToolkit:ButtonSpinner x:Name="Spinner" 
                                  AllowSpin="{Binding AllowSpin, RelativeSource={RelativeSource TemplatedParent}}" 
                                  BorderThickness="{TemplateBinding BorderThickness}" 
                                  Background="{TemplateBinding Background}" 
                                  IsTabStop="False" 
                                  ShowButtonSpinner="{Binding ShowButtonSpinner, RelativeSource={RelativeSource TemplatedParent}}">
            <extToolkit:WatermarkTextBox x:Name="TextBox" 
                                         AcceptsReturn="False" 
                                         BorderThickness="0" 
                                         Background="{TemplateBinding Background}" 
                                         ContextMenu="{TemplateBinding ContextMenu}" 
                                         Foreground="{TemplateBinding Foreground}" 
                                         FontWeight="{TemplateBinding FontWeight}" 
                                         FontStyle="{TemplateBinding FontStyle}" 
                                         FontStretch="{TemplateBinding FontStretch}" 
                                         FontSize="{TemplateBinding FontSize}" 
                                         FontFamily="{TemplateBinding FontFamily}" 
                                         HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                         MinWidth="20" 
                                         SelectAllOnGotFocus="{Binding SelectAllOnGotFocus, RelativeSource={RelativeSource TemplatedParent}}" 
                                         TextAlignment="{Binding TextAlignment, RelativeSource={RelativeSource TemplatedParent}}" 
                                         TextWrapping="NoWrap" 
                                         Text="{Binding Text, RelativeSource={RelativeSource TemplatedParent}, UpdateSourceTrigger=PropertyChanged}" 
                                         TabIndex="{TemplateBinding TabIndex}" 
                                         VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" 
                                         WatermarkTemplate="{Binding WatermarkTemplate, RelativeSource={RelativeSource TemplatedParent}}" 
                                         Watermark="{Binding Watermark, RelativeSource={RelativeSource TemplatedParent}}">
                <extToolkit:WatermarkTextBox.IsReadOnly>
                    <Binding Path="IsEditable" RelativeSource="{RelativeSource TemplatedParent}">
                        <Binding.Converter>
                            <Converters:InverseBoolConverter/>
                        </Binding.Converter>
                    </Binding>
                </extToolkit:WatermarkTextBox.IsReadOnly>
            </extToolkit:WatermarkTextBox>
        </extToolkit:ButtonSpinner>
    </ControlTemplate>

In my Control:

 Template="{StaticResource newDecimalUpDownTemplate}"

我自己也花了一些时间在这个问题上，并找到了一个相当不错的解决方案，我编辑了模板(右键单击DecimalUpDown，然后去编辑模板编辑模板，谢谢Ben你节省了我一些严肃的时间->如何覆盖一个样式)，并将其与辉煌的emorog解决方案相结合!

我写这一切的风格:

<Style x:Key="DecimalUpDownStyle1" TargetType="{x:Type xctk:DecimalUpDown}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type xctk:DecimalUpDown}">
                    <xctk:ButtonSpinner x:Name="PART_Spinner" AllowSpin="{Binding AllowSpin, RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" ButtonSpinnerLocation="{Binding ButtonSpinnerLocation, RelativeSource={RelativeSource TemplatedParent}}" Background="{TemplateBinding Background}" HorizontalContentAlignment="Stretch" IsTabStop="False" ShowButtonSpinner="{Binding ShowButtonSpinner, RelativeSource={RelativeSource TemplatedParent}}" VerticalContentAlignment="Stretch">
                        <xctk:WatermarkTextBox x:Name="PART_TextBox" Text="{Binding Text, RelativeSource={RelativeSource TemplatedParent}, UpdateSourceTrigger=PropertyChanged}" AutoMoveFocus="{Binding AutoMoveFocus, RelativeSource={RelativeSource TemplatedParent}}" AutoSelectBehavior="{Binding AutoSelectBehavior, RelativeSource={RelativeSource TemplatedParent}}" AcceptsReturn="False" BorderThickness="0" Background="Transparent" ContextMenu="{TemplateBinding ContextMenu}" Foreground="{TemplateBinding Foreground}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsTabStop="{TemplateBinding IsTabStop}" IsUndoEnabled="True" MinWidth="20" Padding="{TemplateBinding Padding}" SelectAllOnGotFocus="{Binding SelectAllOnGotFocus, RelativeSource={RelativeSource TemplatedParent}}" TextAlignment="{Binding TextAlignment, RelativeSource={RelativeSource TemplatedParent}}" TextWrapping="NoWrap" TabIndex="{TemplateBinding TabIndex}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" WatermarkTemplate="{Binding WatermarkTemplate, RelativeSource={RelativeSource TemplatedParent}}" Watermark="{Binding Watermark, RelativeSource={RelativeSource TemplatedParent}}"/>
                    </xctk:ButtonSpinner>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

，我可以这样使用它:

<xctk:DecimalUpDown Style="{StaticResource DecimalUpDownStyle1}" Value="{Binding DisplayValue, UpdateSourceTrigger=PropertyChanged}" />

我怀疑你的绑定参数在值转换中"丢失"了。NumericUpDown控件内部通过TemplateBinding将WatermarkTextBox绑定到Text属性，为了使控件尊重您的UpdateSourceTrigger，它可能需要在该级别应用。因此，由于这种中间绑定和Value和Text之间的非即时同步，您无法控制源代码更新行为。

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