Silverlight MVVM 和处理 FOCUS
我正在开发具有各种弹出查找等的复杂数据输入表单。由于不同的原因 - 某些控件的焦点丢失，我需要某种方法在 MVVM 中设置焦点。到目前为止，我想出了附加属性，我像这样编码（跳过了实际的依赖属性声明）：
private static void SetFocus(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var textBox = d as TextBox;
if (textBox != null)
{
textBox.Focus();
}
}
所以，它非常简单。当属性改变时 - 焦点被设置。
我的观点：
<TextBox Text="{Binding CurrentItem.SerialNumber, Mode=TwoWay, NotifyOnValidationError=True}"
behaviors:TextBoxBehaviors.IsFocused="{Binding SecondaryControlFocus}"
Grid.Column="1" Grid.Row="2" Margin="1" Grid.ColumnSpan="2" TabIndex="2" />
如您所见 - 我附加该行为并绑定到“SecondaryControlFocus”属性。
ViewModel：
public bool SecondaryControlFocus
{
get
{
return this.secondaryControlFocus;
}
set
{
this.secondaryControlFocus = value;
this.RaisePropertyChanged(() => this.SecondaryControlFocus);
}
}
以及如何设置焦点的代码：
this.SecondaryControlFocus = !this.SecondaryControlFocus;
对我来说，这段代码闻起来，因为我必须切换属性力并返回才能触发属性。
有没有更好的方法来完成我所做的事情？当高级用户无法使用 TAB 键时，没有什么比这更令人恼火的了...而且我需要控制 MVVM 中的焦点，这对于正确的数据输入流程很重要。但我希望代码有点“好”
I'm developing complex data entry forms with various pop-up lookups, etc. Because of different things - focus of certain controls get lost and I need some way to set focus in MVVM. So far I came up with attached property which I coded like this(actual dependency property declaration skipped):
private static void SetFocus(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var textBox = d as TextBox;
if (textBox != null)
{
textBox.Focus();
}
}
So, it's pretty simple. When property changes - focus get's set.
My view:
<TextBox Text="{Binding CurrentItem.SerialNumber, Mode=TwoWay, NotifyOnValidationError=True}"
behaviors:TextBoxBehaviors.IsFocused="{Binding SecondaryControlFocus}"
Grid.Column="1" Grid.Row="2" Margin="1" Grid.ColumnSpan="2" TabIndex="2" />
As you see - I attach that behavior and Bind to "SecondaryControlFocus" property.
ViewModel:
public bool SecondaryControlFocus
{
get
{
return this.secondaryControlFocus;
}
set
{
this.secondaryControlFocus = value;
this.RaisePropertyChanged(() => this.SecondaryControlFocus);
}
}
And code how I set focus:
this.SecondaryControlFocus = !this.SecondaryControlFocus;
To me this code smells because I have to toggle property force and back in order to trigger property..
Is there nicer way to accomplish what I do? There is nothing more irritating when power user can't use TAB keys... And I need to get control over focusing in MVVM, this is important for proper data entry flow. But I want code to be somewhat "nice"
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它确实有气味，但我认为我们对此无能为力。
通常我对
AttachedProperty执行相同的操作，并在某处保留一个IsFocusedbool在View中（因为这是一个特定于视图的问题，不应与业务逻辑混合）。然后，我将让View监听某种事件系统，例如（PRISM 的EventAggregator或 MVVM Light 的Messenger）以进行ResetFocus事件，每当某些情况导致焦点在我的窗口/页面之间或在对话框之后发生变化时，我都会引发ResetFocus事件。它不漂亮，但很有效。
It does smell, but I don't think there's anything we can do about it
Usually I do the same thing you have with the
AttachedProperty, and keep a singleIsFocusedbool somewhere in theView(since this is a View-Specific problem, and should not be mixed in with the business logic). I'll then have theViewlisten to some kind of Event System such as (PRISM'sEventAggregatoror MVVM Light'sMessenger) forResetFocusevents, and I'll raise theResetFocusevent whenever something causes focus to change between my windows/pages, or after a dialog box.It's not pretty, but it works.