一、水印输入框
要自定义水印输入框，就要先对TextBox的Template有些了解，下面是TextBox的Template
<ControlTemplate x:Key="PhoneDisabledTextBoxTemplate" TargetType="TextBox"> <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/> </ControlTemplate> <Style x:Key="TextBoxStyle1" TargetType="TextBox"> <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/> <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/> <Setter Property="Background" Value="{StaticResource PhoneTextBoxBrush}"/> <Setter Property="Foreground" Value="{StaticResource PhoneTextBoxForegroundBrush}"/> <Setter Property="BorderBrush" Value="{StaticResource PhoneTextBoxBrush}"/> <Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/> <Setter Property="SelectionForeground" Value="{StaticResource PhoneTextBoxSelectionForegroundBrush}"/> <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/> <Setter Property="Padding" Value="2"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="TextBox"> <Grid Background="Transparent"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"/> <VisualState x:Name="MouseOver"/> <VisualState x:Name="Disabled"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Collapsed</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Visible</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="ReadOnly"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Collapsed</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Visible</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="DisabledOrReadonlyContent"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxReadOnlyBrush}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Focused"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBackgroundBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBorderBrush}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Unfocused"/> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Border x:Name="EnabledBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{StaticResource PhoneTouchTargetOverhang}"> <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/> </Border> <Border x:Name="DisabledOrReadonlyBorder" BorderBrush="{StaticResource PhoneDisabledBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" Margin="{StaticResource PhoneTouchTargetOverhang}" Visibility="Collapsed"> <TextBox x:Name="DisabledOrReadonlyContent" Background="Transparent" Foreground="{StaticResource PhoneDisabledBrush}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" IsReadOnly="True" SelectionForeground="{TemplateBinding SelectionForeground}" SelectionBackground="{TemplateBinding SelectionBackground}" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}" Template="{StaticResource PhoneDisabledTextBoxTemplate}"/> </Border> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style>
从上面的Template中分析发现，我们可以修改Name="EnabledBorder"的Border里的布局来实现我们的水印效果。
具体思路是，在<ContentControl x:Name="ContentElement" ......>的后面添加一个一样的ContentControl控件，来显示我们的水印内容，并根据TextBox的Text属性和聚焦状态动态的隐藏和显示我们添加的ContentControl。
实现步骤：
（一）、我们先创建一个引用库，创建一个文件夹名字为“Themes”，并在Themes文件夹下创建一个名字为“Generic.xaml”的文件并将文件 Generic.xaml的Build Action 设置为Resource。（注意：名字不可改） Generic.xaml代码如下：
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WaterTextBox" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <ControlTemplate x:Key="PhoneDisabledTextBoxTemplate" TargetType="TextBox"> <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/> </ControlTemplate> <Style TargetType="local:WaterTextBox"> <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/> <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/> <Setter Property="Background" Value="{StaticResource PhoneTextBoxBrush}"/> <Setter Property="Foreground" Value="{StaticResource PhoneTextBoxForegroundBrush}"/> <Setter Property="BorderBrush" Value="{StaticResource PhoneTextBoxBrush}"/> <Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/> <Setter Property="SelectionForeground" Value="{StaticResource PhoneTextBoxSelectionForegroundBrush}"/> <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/> <Setter Property="Padding" Value="2"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="local:WaterTextBox"> <Grid Background="Transparent"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"/> <VisualState x:Name="MouseOver"/> <VisualState x:Name="Disabled"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Collapsed</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Visible</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="ReadOnly"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Collapsed</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Visible</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="DisabledOrReadonlyContent"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxReadOnlyBrush}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Focused"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBackgroundBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBorderBrush}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Unfocused"/> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Border x:Name="EnabledBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{StaticResource PhoneTouchTargetOverhang}"> <Grid> <ContentControl x:Name="WaterCoElement" Content="{TemplateBinding WaterContent}" FontStyle="Italic" Foreground="{TemplateBinding WaterForeground}" Margin="{StaticResource PhoneTextBoxInnerMargin}" d:LayoutOverrides="Height" Padding="{TemplateBinding Padding}" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"/> <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/> </Grid> </Border> <Border x:Name="DisabledOrReadonlyBorder" BorderBrush="{StaticResource PhoneDisabledBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" Margin="{StaticResource PhoneTouchTargetOverhang}" Visibility="Collapsed"> <TextBox x:Name="DisabledOrReadonlyContent" Background="Transparent" Foreground="{StaticResource PhoneDisabledBrush}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" IsReadOnly="True" SelectionForeground="{TemplateBinding SelectionForeground}" SelectionBackground="{TemplateBinding SelectionBackground}" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}" Template="{StaticResource PhoneDisabledTextBoxTemplate}"/> </Border> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary>
（二）、创建我们的水印输入框控件类，使其继承TextBox。具体代码如下
using System; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace WaterTextBox { public class WaterTextBox : TextBox { public static DependencyProperty WaterContentProprty = DependencyProperty.Register("WaterContent", typeof(object), typeof(WaterTextBox), new PropertyMetadata("水印输入框")); public object WaterContent { get { return GetValue(WaterContentProprty); } set { SetValue(WaterContentProprty, value); } } public static DependencyProperty WaterForegroundProprty = DependencyProperty.Register("WaterForeground", typeof(Brush), typeof(WaterTextBox), new PropertyMetadata(new SolidColorBrush(Colors.Gray))); public Brush WaterForeground { get { return (Brush)GetValue(WaterForegroundProprty); } set { SetValue(WaterForegroundProprty, value); } } public WaterTextBox() { DefaultStyleKey = typeof(WaterTextBox); } ContentControl WaterContentElement = null; public override void OnApplyTemplate() { base.OnApplyTemplate(); WaterContentElement = this.GetTemplateChild("WaterCoElement") as ContentControl; if (WaterContentElement != null) { if (string.IsNullOrEmpty(Text)) WaterContentElement.Visibility = System.Windows.Visibility.Visible; else WaterContentElement.Visibility = System.Windows.Visibility.Collapsed; } } protected override void OnGotFocus(RoutedEventArgs e) { if (WaterContentElement != null && string.IsNullOrEmpty(Text)) WaterContentElement.Visibility = Visibility.Collapsed; base.OnGotFocus(e); } protected override void OnLostFocus(RoutedEventArgs e) { if (WaterContentElement != null && string.IsNullOrEmpty(Text)) WaterContentElement.Visibility = Visibility.Visible; base.OnLostFocus(e); } } }
此处重载了TextBox的三个函数，分别是OnGotFocus、OnLostFocus和OnApplyTemplate，重载OnApplyTemplate在这里我们可以得到我们下名为WaterCoElement的ContentControl控件，来动态的控制显示隐藏。到这里我们的水印输入框就做好了。（注意：因为我们是使用ContentControl来显示水印的内容，而ContentControl的Content是Object，所以呢，我们可以在里面放任何复杂的控件）下面看下效果：
二、水印密码框
思路：既然水印输入框做好了，密码框和输入框差不多，我们是不是可以一样字画葫芦那？这个想法自然是最容易想到的，但可惜PasswordBox是一个封闭类，不可以继承，⊙﹏⊙b汗。那怎么办？既然TextBox和PasswordBox很相近，我们是不是可以从TextBox下手那。上面水印输入框是修改了Border.Name="EnabledBorder"，在Border下面有一个ContentControl，那么我们把ContentControl换成PasswordBox是否可行那？让我们try一下吧。（PS：此处只是我做的时候一个想法，不过得到证实没有问题）
步骤同上面水印输入框一样，直接上代码：
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WaterTextBox" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <ControlTemplate x:Key="PhoneDisabledTextBoxTemplate" TargetType="TextBox"> <ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="{StaticResource PhoneTextBoxInnerMargin}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/> </ControlTemplate> <Style TargetType="local:WaterPasswordBox"> <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/> <Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/> <Setter Property="Background" Value="{StaticResource PhoneTextBoxBrush}"/> <Setter Property="Foreground" Value="{StaticResource PhoneTextBoxForegroundBrush}"/> <Setter Property="BorderBrush" Value="{StaticResource PhoneTextBoxBrush}"/> <Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/> <Setter Property="SelectionForeground" Value="{StaticResource PhoneTextBoxSelectionForegroundBrush}"/> <Setter Property="BorderThickness" Value="{StaticResource PhoneBorderThickness}"/> <Setter Property="Padding" Value="2"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="local:WaterPasswordBox"> <Grid Background="Transparent"> <VisualStateManager.VisualStateGroups> <VisualStateGroup x:Name="CommonStates"> <VisualState x:Name="Normal"/> <VisualState x:Name="MouseOver"/> <VisualState x:Name="Disabled"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Collapsed</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Visible</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="ReadOnly"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Collapsed</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <Visibility>Visible</Visibility> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="DisabledOrReadonlyBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="DisabledOrReadonlyContent"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxReadOnlyBrush}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> </VisualStateGroup> <VisualStateGroup x:Name="FocusStates"> <VisualState x:Name="Focused"> <Storyboard> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBackgroundBrush}"/> </ObjectAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="EnabledBorder"> <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneTextBoxEditBorderBrush}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> </VisualState> <VisualState x:Name="Unfocused"/> </VisualStateGroup> </VisualStateManager.VisualStateGroups> <Border x:Name="EnabledBorder" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Margin="{StaticResource PhoneTouchTargetOverhang}"> <Grid> <ContentControl x:Name="WaterCoElement" Content="{TemplateBinding WaterContent}" FontStyle="Italic" Foreground="{TemplateBinding WaterForeground}" Margin="{StaticResource PhoneTextBoxInnerMargin}" d:LayoutOverrides="Height" Padding="{TemplateBinding Padding}" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"/> <PasswordBox x:Name="ContentElement" Password="{Binding Text}" Background="{Binding Background}" BorderThickness="0" HorizontalContentAlignment="Stretch" Margin="-12" Padding="{TemplateBinding Padding}" VerticalContentAlignment="Stretch"/> </Grid> </Border> <Border x:Name="DisabledOrReadonlyBorder" BorderBrush="{StaticResource PhoneDisabledBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="Transparent" Margin="{StaticResource PhoneTouchTargetOverhang}" Visibility="Collapsed"> <TextBox x:Name="DisabledOrReadonlyContent" Background="Transparent" Foreground="{StaticResource PhoneDisabledBrush}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" IsReadOnly="True" SelectionForeground="{TemplateBinding SelectionForeground}" SelectionBackground="{TemplateBinding SelectionBackground}" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}" Template="{StaticResource PhoneDisabledTextBoxTemplate}"/> </Border> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> </ResourceDictionary>
.Cs
using System; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Ink; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; namespace WaterTextBox { public class WaterPasswordBox : TextBox { public static DependencyProperty WaterContentProprty = DependencyProperty.Register("WaterContent", typeof(object), typeof(WaterPasswordBox), new PropertyMetadata("水印密码框")); public object WaterContent { get { return GetValue(WaterContentProprty); } set { SetValue(WaterContentProprty, value); } } public static DependencyProperty WaterForegroundProprty = DependencyProperty.Register("WaterForeground", typeof(Brush), typeof(WaterPasswordBox), new PropertyMetadata(new SolidColorBrush(Colors.Gray))); public Brush WaterForeground { get { return (Brush)GetValue(WaterForegroundProprty); } set { SetValue(WaterForegroundProprty, value); } } public WaterPasswordBox() { DefaultStyleKey = typeof(WaterPasswordBox); } ContentControl WaterContentElement = null; PasswordBox PasswordBoxElement = null; public override void OnApplyTemplate() { base.OnApplyTemplate(); WaterContentElement = this.GetTemplateChild("WaterCoElement") as ContentControl; PasswordBoxElement = this.GetTemplateChild("ContentElement") as PasswordBox; if (WaterContentElement != null && PasswordBoxElement != null) { if (string.IsNullOrEmpty(PasswordBoxElement.Password)) WaterContentElement.Visibility = System.Windows.Visibility.Visible; else WaterContentElement.Visibility = System.Windows.Visibility.Collapsed; } } protected override void OnGotFocus(RoutedEventArgs e) { if (WaterContentElement != null && string.IsNullOrEmpty(PasswordBoxElement.Password)) WaterContentElement.Visibility = Visibility.Collapsed; base.OnGotFocus(e); } protected override void OnLostFocus(RoutedEventArgs e) { if (WaterContentElement != null && string.IsNullOrEmpty(PasswordBoxElement.Password)) WaterContentElement.Visibility = Visibility.Visible; base.OnLostFocus(e); } } }
运行效果：
Ok搞定了，使用下还不错，不过PasswordBox的属性在WaterPasswordBox中无法使用。⊙﹏⊙b汗
Ps：如果你想让WaterPasswordBox和PasswordBox一样可以设置很多属性，那就开一些和WaterContent一样的依赖属性，或者你直接开一个Style属性吧。
源码下载:https://files.cnblogs.com/qq278360339/PhoneApp_1.rar
Ps:给大家介绍一个不错我wp论坛，卤面网
原文链接：http://www.cnblogs.com/qq278360339/archive/2012/07/05/2577509.html