点击编辑控件-怎么做？ [英] Click-to-edit control - how to do it?
本文介绍了点击编辑控件-怎么做？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用发布的Silverlight 2.0和发布的Silverlight 4.0学习Silverlight，好吧，只是玩弄它：-)
作为其中的一部分，我正在尝试开发一个应该非常简单的内容控件：一个标签，您可以通过单击它来编辑它。
我的灵感来自另一个SO问题(Click-to-edit in Silverlight)，但我有一些问题与我对Silverlight非常陌生有关。：)
我将首先发布代码，然后发布我的问题。
这是我的XAML：
<ContentControl x:Class="MyTestProject.SilverlightControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:sdk="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data.Input" xmlns:local="clr-namespace:MyTestProject" mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<ContentControl.Resources>
<ControlTemplate x:Key="EditableLabelTextboxTemplate">
<TextBox Name="UCTB" Text="{Binding Text, Mode=TwoWay}" Width="100" Height="25" ></TextBox>
</ControlTemplate>
<ControlTemplate x:Name="LabelTemplate" TargetType="local:SilverlightControl1">
<sdk:Label x:Name="UCLBL" Content="{Binding Text}" />
</ControlTemplate>
<Style TargetType="local:SilverlightControl1">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate x:Name="LabelTemplate2" TargetType="local:SilverlightControl1">
<sdk:Label x:Name="UCLBL" Content="{Binding Text}" />
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ContentControl.Resources>
</ContentControl>
这是我的代码后面：
public partial class SilverlightControl1 : ContentControl
{
public string Text { get; set; }
public SilverlightControl1()
{
this.DataContext = this;
Text = "Hello, World!";
this.DefaultStyleKey = typeof(SilverlightControl1);
//Template = this.Resources["LabelTemplate"] as ControlTemplate;
InitializeComponent();
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
this.MouseLeftButtonDown += HandleLabelLeftMouseDown;
this.KeyDown += HandleTextboxEnter;
}
public static void HandleTextboxEnter(object sender, KeyEventArgs args)
{
var ctrl = sender as SilverlightControl1;
if (ctrl.Template == ctrl.Resources["EditableLabelTextboxTemplate"])
{
if (args.Key == Key.Enter)
{
ctrl.Template = ctrl.Resources["LabelTemplate"] as ControlTemplate;
}
}
}
public static void HandleLabelLeftMouseDown(object sender, MouseButtonEventArgs args)
{
var editableLabel = sender as SilverlightControl1;
if (editableLabel.Template != editableLabel.Resources["EditableLabelTextboxTemplate"])
{
editableLabel.Template = editableLabel.Resources["EditableLabelTextboxTemplate"] as ControlTemplate;
}
}
}
有两个控件模板(一个标签、一个文本框)，但也有一个带有标签的样式用于初始化。如果我删除它(以及代码幕后的构造函数中的对应行)，即使我也设置了模板，也不会呈现任何内容。一定有更好的办法？
我的第二个问题是，当我将控件放在测试项目中并使用它时，该控件移动？它将作为标签从中间的左侧开始，然后我点击它，文本框显示在页面的中央，按Enter键标签重新出现在屏幕的左侧？
编辑： 第三，一旦我用文本框替换标签，文本框就没有焦点了，我不知道如何赋予它？
最后，现在停止编辑的唯一方法是按"Enter"键。理想情况下，我只想在文本框外单击，但使用Lost Focus事件(如链接中所建议的)似乎太频繁了，以至于我无法使用它？我希望一些Silverlight大师能帮助我！：-)
哦，如果有人知道我可以使用/查看一个可用的点击编辑控件，我也会非常感激：)
提前谢谢！
推荐答案
我希望我没弄错。您需要的是一个在开始时不可编辑的文本框，但如果您单击它，它将是可编辑的。
为此，我创建了一个继承自文本框的控件(我使用了VS模板TempledControl)。我添加了两个状态(编辑和非编辑)和一个矩形，作为非编辑模式的文本上的层(防止鼠标光标在鼠标上移动)。我还做了一些关于边界的任务。例如，在非编辑状态下，边框的大小为0，因此文本框看起来像标签。以下是XAML：
<Style TargetType="local:ClickToEditTextBox">
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="Background" Value="#FFFFFFFF"/>
<Setter Property="Foreground" Value="#FF000000"/>
<Setter Property="Padding" Value="2"/>
<Setter Property="BorderBrush">
<Setter.Value>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="#FFA3AEB9" Offset="0"/>
<GradientStop Color="#FF8399A9" Offset="0.375"/>
<GradientStop Color="#FF718597" Offset="0.375"/>
<GradientStop Color="#FF617584" Offset="1"/>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="local:ClickToEditTextBox">
<Grid x:Name="RootElement">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal"/>
<VisualState x:Name="MouseOver"/>
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="DisabledVisualElement" Storyboard.TargetProperty="Opacity" To="1" Duration="0"/>
</Storyboard>
</VisualState>
<VisualState x:Name="ReadOnly">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="ReadOnlyVisualElement" Storyboard.TargetProperty="Opacity" To="1" Duration="0" />
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="Opacity" To="1" Duration="0"/>
</Storyboard>
</VisualState>
<VisualState x:Name="Unfocused">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="FocusVisualElement" Storyboard.TargetProperty="Opacity" To="0" Duration="0"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ValidationStates">
<VisualState x:Name="Valid"/>
<VisualState x:Name="InvalidUnfocused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="InvalidFocused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ValidationErrorElement" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsOpen">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<sys:Boolean>True</sys:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<!-- The new edit states -->
<VisualStateGroup x:Name="EditStates">
<VisualState x:Name="Edit">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="rectangle">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="NotEdit">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Border.BorderThickness)" Storyboard.TargetName="Border">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Thickness>0</Thickness>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border x:Name="Border" CornerRadius="1" Opacity="1" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1">
<Grid>
<Border x:Name="ReadOnlyVisualElement" Opacity="0" Background="#5EC9C9C9"/>
<Border x:Name="MouseOverBorder" BorderThickness="1" BorderBrush="Transparent">
<Grid>
<ScrollViewer x:Name="ContentElement" Padding="{TemplateBinding Padding}" BorderThickness="0" IsTabStop="False"/>
<Rectangle x:Name="rectangle" Fill="#02FFFFFF" />
</Grid>
</Border>
</Grid>
</Border>
<Border x:Name="DisabledVisualElement" Background="#A5F7F7F7" BorderBrush="#A5F7F7F7" BorderThickness="{TemplateBinding BorderThickness}" Opacity="0" IsHitTestVisible="False"/>
<Border x:Name="FocusVisualElement" BorderBrush="#FF6DBDD1" BorderThickness="{TemplateBinding BorderThickness}" Margin="1" Opacity="0" IsHitTestVisible="False"/>
<Border x:Name="ValidationErrorElement" BorderThickness="1" CornerRadius="1" BorderBrush="#FFDB000C" Visibility="Collapsed">
<ToolTipService.ToolTip>
<ToolTip x:Name="validationTooltip" Template="{StaticResource ValidationToolTipTemplate}" Placement="Right"
PlacementTarget="{Binding RelativeSource={RelativeSource TemplatedParent}}"
DataContext="{Binding RelativeSource={RelativeSource TemplatedParent}}">
<ToolTip.Triggers>
<EventTrigger RoutedEvent="Canvas.Loaded">
<BeginStoryboard>
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="validationTooltip" Storyboard.TargetProperty="IsHitTestVisible">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<sys:Boolean>true</sys:Boolean>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ToolTip.Triggers>
</ToolTip>
</ToolTipService.ToolTip>
<Grid Width="12" Height="12" HorizontalAlignment="Right" Margin="1,-4,-4,0" VerticalAlignment="Top" Background="Transparent">
<Path Margin="1,3,0,0" Data="M 1,0 L6,0 A 2,2 90 0 1 8,2 L8,7 z" Fill="#FFDC000C"/>
<Path Margin="1,3,0,0" Data="M 0,0 L2,0 L 8,6 L8,8" Fill="#ffffff"/>
</Grid>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
如您所见，有两个新状态：编辑和未编辑。
所以我后面的代码最初将控件"发送"到NotEdit状态，并为GotFocus和LostFocus添加了两个处理程序。
this.GotFocus += ClickToEditTextBox_GotFocus;
this.LostFocus += ClickToEditTextBox_LostFocus;
VisualStateManager.GoToState(this, "NotEdit", false);
处理程序只是"发送"处于Defined状态的控件：
void ClickToEditTextBox_LostFocus(object sender, RoutedEventArgs e)
{
VisualStateManager.GoToState(this, "NotEdit", false);
}
void ClickToEditTextBox_GotFocus(object sender, RoutedEventArgs e)
{
VisualStateManager.GoToState(this, "Edit", false);
}
下面是完整的src代码：
public class ClickToEditTextBox : TextBox
{
public ClickToEditTextBox()
{
this.DefaultStyleKey = typeof(ClickToEditTextBox);
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
this.GotFocus += ClickToEditTextBox_GotFocus;
this.LostFocus += ClickToEditTextBox_LostFocus;
VisualStateManager.GoToState(this, "NotEdit", false);
}
void ClickToEditTextBox_LostFocus(object sender, RoutedEventArgs e)
{
VisualStateManager.GoToState(this, "NotEdit", false);
}
void ClickToEditTextBox_GotFocus(object sender, RoutedEventArgs e)
{
VisualStateManager.GoToState(this, "Edit", false);
}
}
现在您可以在UserControl中使用它：
<SilverlightApplication1:ClickToEditTextBox Text="12345" Width="100" Height="22" />
这只是一个快速实现，因此可以进行一些改进。但我希望，这能帮助你解决你的问题。
BR，TJ
这篇关于点击编辑控件-怎么做？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
