Question

我正在使用ListBox我使用PlaceholderText TextBox属性的ListBox。这是我PopUp的代码。我使用A <Popup x:Name="ReasonCodePopUp" x:FieldModifier="Public" IsOpen="{Binding ShowFuelChangeReasonPopUp, Mode=TwoWay}" Height="420" Width="1100" Grid.Row="0" Grid.RowSpan="2" IsLightDismissEnabled="True"> <Grid Height="397" Width="1100" > <TextBlock Visibility="Collapsed" Name="txtFuelReason" Text="{x:Bind ViewModel.FuelPlanInfo.ExtraFuelReason,Mode=TwoWay}"/> <ListBox Margin="20" Name="lstFuelReason" SelectionChanged="lstFuelReason_SelectionChanged" Background="#414042" Height="420" Width="1100" > <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Background" Value="Transparent"/> <Setter Property="Margin" Value="0"/> <Setter Property="Padding" Value="0"/> <Setter Property="Height" Value="40"/> <Setter Property="Padding" Value="0"/> </Style> </ListBox.ItemContainerStyle> <ListBoxItem IsEnabled="False" Margin="43.5,30.5,748.5,0"> <TextBlock Text="Reason Code" FontSize="32" FontFamily="Helvetica" FontWeight="Bold" Foreground="#ffffff" IsHitTestVisible="False" /> </ListBoxItem> <ListBoxItem IsEnabled="False"> <Border Margin="43,0,57,0" BorderBrush="#979797" BorderThickness="0,0,0,1" Width="948"/> </ListBoxItem> <ListBoxItem> <TextBlock Text="ATC" Margin="43,0,57,0" Foreground="#FFFFFF" FontSize="32" FontFamily="{ThemeResource Bold}" FontWeight="Normal" SelectionHighlightColor="Blue"></TextBlock> </ListBoxItem> <ListBoxItem IsEnabled="False"> <Border Margin="43,0,57,0" BorderBrush="#979797" BorderThickness="0,0,0,1" Width="948"/> </ListBoxItem> <ListBoxItem> <TextBlock Text="Weather" Margin="43,0,57,0" Foreground="#FFFFFF" FontSize="32" FontFamily="{ThemeResource Bold}" FontWeight="Normal"></TextBlock> </ListBoxItem> <ListBoxItem IsEnabled="False" Margin="0"> <Border Margin="43,0,57,0" BorderBrush="#979797" BorderThickness="0,0,0,1" Width="948"/> </ListBoxItem> <ListBoxItem Height="50"> <TextBox PlaceholderText="Other" Margin="43.5,0,0,0" Tapped="FuelReasonOther_Tapped" TextChanged="TextBox_TextChanged" Foreground="#FF0078D7" FontSize="32" FontFamily="{ThemeResource Bold}" FontWeight="Normal" Style="{StaticResource TransparentTextBox}"/> </ListBoxItem> </ListBox> </Grid> </Popup>来实现内容

<TextBox PlaceholderText="Other"/>

我希望Blue修改“其他”的前景颜色以及此处输入的文字以显示在ContentTemplate中。我知道我需要玩clock_t stime = clock(); sleep(3); clock_t etime = clock(); // print etime and stime and (etime - stime) * 1000 and CLOCKS_PER_SEC unsigned long millis = ((etime - stime) * 1000) / CLOCKS_PER_SEC; printf("%lu\n",millis);但不能这样做。有人可以帮忙吗？

Answer 1

如果覆盖TextControl定义的画笔，则可以将颜色更改为所需的颜色，而无需主题化整个TextBox控件。我使用以下代码对其进行了测试，并且有效：

<TextBox PlaceholderText="Other" Margin="43.5,0,0,0" FontSize="32" FontWeight="Normal">
    <TextBox.Resources>
        <SolidColorBrush x:Key="TextControlPlaceholderForeground" Color="LightBlue"/>
        <SolidColorBrush x:Key="TextControlPlaceholderForegroundFocused" Color="LightBlue" />
        <SolidColorBrush x:Key="TextControlPlaceholderForegroundPointerOver" Color="LightBlue" />
        <SolidColorBrush x:Key="TextControlForeground" Color="Blue" />
        <SolidColorBrush x:Key="TextControlForegroundFocused" Color="Blue" />
        <SolidColorBrush x:Key="TextControlForegroundPointerOver" Color="Blue" />
    </TextBox.Resources>
</TextBox>

注意：我删除了绑定和事件处理程序以仅保留UI元素。但是您应该能够将TextBox.Resources添加到TextBox中并查看它是否有效。

TextBox.Resources覆盖TextControl的默认画笔（在TextBox中）。控件使用这些画笔名称在特定情况下绘制。

如果这样做，请告诉我。

如何在列表框中自定义PlaceholderText以在UWP中具有特定颜色

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