[英]Letting users customize content property of user control at run-time
這是必需的行為:
我在畫布上有各種控件,例如標注(來自Expression Blend .dll)或簡單的標簽。 當用戶“雙擊”(或我決定參與的其他任何事件)時,控件應更改其外觀以允許用戶編輯控件的Content屬性。 單擊該控件,然后應將其重新設置為“只讀”方法。
關於如何最好地實現這一點的任何建議? 理想情況下,我想在c#中完成所有操作,以在運行時將此行為添加到控件中(因為此控件是動態添加到畫布中的)-並完全避免使用XAML。
我認為我必須與裝飾者一起做一些事情,以在所需的事件上顯示綁定到控件的content屬性的文本框,但是某些代碼示例或其他地方的鏈接會受到贊賞嗎? :)-我無法在現有搜索中找到任何內容,但我認為它應該相當簡單。
不幸的是,樣式觸發器對IsReadOnly和IsEnabled無效。 您必須從事件中做到這一點。
這是我的示例:
WPF:
<Window x:Class="StateChangingTextbox.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style TargetType="TextBox">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#eee" />
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBox Width="300" Height="200" TextWrapping="Wrap" IsReadOnly="True"
MouseEnter="TextBox_MouseEnter"
MouseLeave="TextBox_MouseLeave"/>
</Grid>
</Window>
后台代碼:
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void TextBox_MouseEnter(object sender, MouseEventArgs e)
{
var textbox = sender as TextBox;
if (textbox != null)
{
textbox.IsReadOnly = false;
}
}
private void TextBox_MouseLeave(object sender, MouseEventArgs e)
{
var textbox = sender as TextBox;
if (textbox != null)
{
textbox.IsReadOnly = true;
}
}
}
XAML:
<UserControl
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:ed="http://schemas.microsoft.com/expression/2010/drawing"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
mc:Ignorable="d"
x:Class="ComicWPF.Bubble"
x:Name="UserControl" Height="100" Width="200">
<Canvas LostFocus="this_LostFocus">
<ed:Callout x:Name="callout" Content=""
AnchorPoint="0,1" FontSize="14" Height="100" Width="200"
Fill="Blue"
PreviewMouseDoubleClick="Callout_DoubleClick"
Canvas.Left="0" Canvas.Top="0" />
<TextBox x:Name="textbox"
FontSize="14"
Canvas.Left="30" Height="55" Width="80" Canvas.Top="30"
Visibility="Visible"/>
</Canvas>
</UserControl>
C#代碼:
private void Callout_DoubleClick(object sender, MouseButtonEventArgs e)
{
Activate();
}
public void Activate()
{
//set bool activated to true
//make textbox visible and set focus and select all text
}
private void Callout_DeSelect()
{
//set content of callout to the textbox.Text
//Hide textbox
//set bool activated to false
}
private void this_LostFocus(object sender, RoutedEventArgs e)
{
Callout_DeSelect();
}
}
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