当UserControl更改可视性时，将焦点放在TextBox上 [英] Focus on TextBox when UserControl change Visibility

问题描述

我有一个用户控件加载在画布内;这个默认情况下的用户控件的可见性崩溃了。当我的窗口的特定文本框被关注时，usercontrol变得可见。

当usercontrol变得可见时，我想将焦点设置到usercontrol内的另一个文本框中。 b

我尝试这样做：

pre $ private $ UserControl_IsVisibleChanged（object sender，DependencyPropertyChangedEventArgs e）

if（this.Visibility == Visibility.Visible）
{
FocusManager.SetFocusedElement（this，TextBlockInput）;






$ b

看来工作，但有一个问题：文本框似乎集中，但光标到文本框不闪烁，我不能输入字符的输入。

我会说，焦点后的文本框准备好输入。我该怎么办？

解决方案

好的，我这样解决：

（$ this.Visibility == Visibility.Visible）
{$ b $ private $ UserControl_IsVisibleChanged（object sender，DependencyPropertyChangedEventArgs e）
{
（this）（this）（b）this.Dispatcher.BeginInvoke（（Action）delegate
{
Keyboard.Focus（TextBlockInput）;
}，DispatcherPriority.Render）;




$ b $ p
$ b我认为问题是焦点调用IsVisibleChanged事件范围...对吗？

I have a usercontrol loaded inside a canvas; this usercontrol on default have visibility collapsed. When a specific textbox of my window is focused the usercontrol become visible.

When usercontrol become visible I want set focus to another textbox inside usercontrol.

I try to do that:

private void UserControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
        if (this.Visibility == Visibility.Visible)
        {                
            FocusManager.SetFocusedElement(this, TextBlockInput);
        }
}

It seems work but there is a problem: the textbox seems focused but the cursor into textbox don't blink and I can't type chars for input.

I would that after focus the textbox is ready for input. How can I do?

解决方案

Well, I solve in this way:

private void UserControl_IsVisibleChanged(object sender, DependencyPropertyChangedEventArgs e)
{
    if (this.Visibility == Visibility.Visible)
    {
        this.Dispatcher.BeginInvoke((Action)delegate
        {
            Keyboard.Focus(TextBlockInput);
        }, DispatcherPriority.Render);
    }
}

I think that the problem was tha focus call into IsVisibleChanged event "scope"...right?

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