Question

我一直在尝试在getFocus事件上更改WPF应用程序中文本框的背景。在winforms中我做了类似的事情并且工作正常。

    class Format_GUI
        {
            public void center_groupbox(Control cntrl, Form ms_form)
              {
                cntrl.Left = (ms_form.ClientSize.Width - cntrl.Width) / 2;

              }


           public void color_control(Control myControl)
              {
                Control inst_Control = new Control();
                inst_Control = myControl;
                inst_Control.BackColor =   System.Drawing.ColorTranslator.FromHtml("#E55451");
              }

}

然后我可以在Enter事件上调用类函数，如下所示：

    private void txtTextBox1_Enter(object sender, EventArgs e)
    {
        myGUI.highlight_SelectedControl(txtTextBox1);
    }

这在WinForms中运行良好。有没有人知道如何在WPF应用程序中完成这项工作？

Answer 1

首先，TextBox有GotFocus个事件。使用x:Name指令使代码框可以访问...

在xaml ......

<TextBox x:Name="TextBox" GotFocus="Handler"/>

然后在代码隐藏......

private void Handler(object sender, RoutedEventArgs args)
{
    TextBox.Background = new SolidColorBrush(Color.FromArgb(...));
}

但是，在WPF中，还可以选择使用Binding

<TextBox>
    <TextBox.Style>
        <Style TargetType="Control">
            <Style.Triggers>
                <DataTrigger Binding="{Binding IsFocused, Mode=OneWay, RelativeSource={RelativeSource Self}}"
                             Value="True">
                    <Setter Property="Background" Value="#E55451"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </TextBox.Style>
</TextBox>

这不仅会导致着色行为，还会在未聚焦时还原它，而不需要依赖事件，因此相同的代码可以应用于任何类型的控件

与任何样式一样，这也可以放在要使用的资源字典中，可能附加到类型本身。

<!-- Resources under App.xaml. This can also be embedded in a ResourceDictionary -->
<Resources>
    <Style x:Key="{x:Type TextBox}" TargetType="Control">
        <Style.Triggers>
            <DataTrigger Binding="{Binding IsFocused, Mode=OneWay, RelativeSource="{RelativeSource Self}}"
                         Value="True">
                <Setter Property="Background" Value="#E55451"/>
            </DataTrigger>
        </Style.Triggers>
    </Style>
<Resources>

Answer 2

Imho最好的方法是在XAML中使用触发器

<TextBox>
        <TextBox.Style>
            <Style TargetType="TextBox">
                <Style.Triggers>
                    <Trigger Property="TextBox.IsFocused"
                             Value="True">
                        <Setter Property="TextBox.Background"
                                Value="#E55451" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </TextBox.Style>
    </TextBox>

Answer 3

只需转到XAML中的TextBox元素并添加GotFocus事件即可。这将在后面的代码中分配一个新的处理程序。您必须先发送发件人，然后才能访问TextBox。

private void txtTextBox1_GotFocus(object sender, RoutedEventArgs e)
{
    TextBox tbox = sender as TextBox;
    tbox.Background = Brushes.Red;
}

如果你想要改变它，还有一个LostFocus事件。

Answer 4

您需要的只是在您的重点事件中将其更改为该哈希代码

((TextBox)sender).Background = (SolidColorBrush)(new BrushConverter().ConvertFrom("#E55451"));

Answer 5

在XAML中查找元素并添加事件，即：

#-------------------------------------------------------------------------
# Warmup.ps1
#-------------------------------------------------------------------------
[int]$returnme = 0
[int]$SleepTime = 5
[string]$regex = '[>"]?[aA]vailable["<]?'
[string]$strContains = $regex
# [string]$strContains = "log in"
[string]$hostName = hostname
[string]$domainName = (Get-WmiObject -Class Win32_NetworkAdapterConfiguration -Filter IPEnabled=TRUE -ComputerName .).DNSDomain
[string]$warmMeUp = "http://$hostName.$domainName/endpoint"
[string]$html = "Will Be Set Later"

#-------------------------------------------------------------------------
# Get-WebPage
#-------------------------------------------------------------------------
function Get-WebPage([string]$url) 
{
    try 
    {
        $wc = new-object net.webclient; 
        $wc.credentials = [System.Net.CredentialCache]::DefaultCredentials;
        [string]$pageContents = $wc.DownloadString($url);
        $wc.Dispose();
    }
    catch
    {
        Write-Host "First Try Failed.  Second Try in $SleepTime Seconds."
        try
        {
            Start-Sleep -s $SleepTime
            $wc = new-object net.webclient; 
            $wc.credentials = [System.Net.CredentialCache]::DefaultCredentials;
            $pageContents = $wc.DownloadString($url);
            $wc.Dispose();
        }
        catch
        {
            $pageContents = GetWebSiteStatusCode($url)
        }
    }
    return $pageContents;
}

#-------------------------------------------------------------------------
# GetWebSiteStatusCode
#-------------------------------------------------------------------------
function GetWebSiteStatusCode 
{
    param (
        [string] $testUri,
        [int] $maximumRedirection = 5
    )
    $request = $null
    try {
        $request = Invoke-WebRequest -Uri $testUri -MaximumRedirection $maximumRedirection -ErrorAction SilentlyContinue
    } 
    catch [System.Net.WebException] {
        $request = $_.ErrorDetails.Message
    }
    catch {
        Write-Error $_.Exception
        return $null
    }
    return $request
}

#-------------------------------------------------------------------------
# Main Application Logic
#-------------------------------------------------------------------------
"Warming up '{0}'..." -F $warmMeUp;
$html = Get-WebPage -url $warmMeUp;

Write-Host "Looking for Pattern $strContains"
if ($html.ToLower().Contains("unavailable") -or !($html -match $strContains))
{
    $returnme = -1
    Write-Host "Warm Up Failed. html returned:`n" + $html
}

exit $returnme

并设置颜色：

<TextBox Height="23" Name="textBox1" Width="120" GotFocus="textBox1_GotFocus" LostFocus="textBox1_LostFocus" />

如何在getFocus上更改文本框背景颜色

5 个答案: