wpf - 将命令绑定(bind)到 xctk :IntegerUpDown 的 'LostMouseCapture' 事件

Question

我想将 Icommand 绑定(bind)到 xctk:IntegerUpDown 的事件。事件是“LostMouseCapture”

在 XAML 中:

<xctk:IntegerUpDown Name="MinColor" ClipValueToMinMax="True" Grid.Column="2" 
                                                    Minimum="0" Maximum="{Binding Path=MinColorMaxValue}" Value="{Binding Path=MinColorValue}" Increment="1"   
                                                    PreviewTextInput="IntegerUpDown_PreviewTextInput" DataObject.Pasting="IntegerUpDown_Pasting" PreviewKeyDown="IntegerUpDown_PreviewKeyDown" >
                                                    <i:Interaction.Triggers>
                                                        <i:EventTrigger EventName="LostMouseCapture">
                                                            <i:InvokeCommandAction Command="{Binding Path=ValueCommand}" CommandParameter="{Binding FileName}"/>
                                                        </i:EventTrigger>
                                                    </i:Interaction.Triggers>
                                                </xctk:IntegerUpDown> 

在 View 模型中:

private DelegateCommand m_ValueCommand = null;          

    public ICommand ValueCommand
    {
        get
        {
            if (m_ValueCommand == null)
                m_ValueCommand = new DelegateCommand(new Action<object>(ExecuteValueCommand),
                    new Predicate<object>(CanExecuteValueCommand));
            return m_ValueCommand;
        }
    }

    public bool CanExecuteValueCommand(object sender)
    {  
        return true;
    }

    public void ExecuteValueCommand(object sender)
    {
    }

当我在 IntegerUpdown 中输入一些值并单击外部时，我想调用“ValueCommand”。有什么解决办法吗？

Answer 1

从您的 MinColorValue 的 setter 中调用您的命令源属性:

private int _minColorValue;
public int MinColorValue
{
    get { return _minColorValue; }
    set
    {
        _minColorValue = value;
        ValueCommand.Execute(FileName);
    }
}

或尝试处理 LostKeyboardFocus或 LostFocus事件:

<i:EventTrigger EventName="LostKeyboardFocus">