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QuestionCan we add animation to WPF just like we have SHAPE animation in powerpoint? Pin
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QuestionVertical text in WPF grid Pin
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AnswerRe: Vertical text in WPF grid Pin
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AnswerRe: Vertical text in WPF grid Pin
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QuestionBehavior/DP Question Pin
Kevin Marois22-Jun-20 9:27
professionalKevin Marois22-Jun-20 9:27 
AnswerRe: Behavior/DP Question Pin
Richard Deeming23-Jun-20 5:44
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GeneralRe: Behavior/DP Question Pin
Kevin Marois1-Jul-20 9:30
professionalKevin Marois1-Jul-20 9:30 
Ok, so I implemented your changes and the GetAllowEnable(sender) gets called fine. However, overall things still don't work right. Let me explain...

This is all in a small WPF test app. On the window I have a TextBox, and a ToggleButton called Enabled. When the Toggle is clicked, I set a property in the code behind called AreFieldsEnabled to True. This property is bound on the TextBox to the SecurityBehavior's AllowEnable DP:
<TextBox Grid.Row="2" 
            Grid.Column="1"
            Text="{Binding EmployeeName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
            Height="32"
            Width="250"
            local:SecurityBehavior.AllowEnable="{Binding AreFieldsEnabled, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
            local:SecurityBehavior.SecurityTags="can_add_employees|can_edit_employees" 
            HorizontalAlignment="Left"
            VerticalAlignment="Top"
            Margin="5"/>


The problem is that the SecurityTags DP gets called first, which calls GetAllowEnable, which return False by default because AllowEnable hasn't yet been set to True (using the ToggleButton). Later, when I toggle the button and set AreFieldsEnabled to True, the SecurityTags property is never called again, so nothing is enabled. Here's all the code:

Behavior
public static class SecurityBehavior
{
    private static readonly char[] TagSeparators = { '|' };
    #region Allow Enable
    public static readonly DependencyProperty AllowEnableProperty =
                                DependencyProperty.RegisterAttached("AllowEnable",
                                typeof(bool),
                                typeof(SecurityBehavior),
                                new PropertyMetadata(false, OnAllowEnableChanged));
    public static bool GetAllowEnable(DependencyObject obj)
    {
        return (bool)obj.GetValue(AllowEnableProperty);
    }
    public static void SetAllowEnable(DependencyObject obj, bool value)
    {
        obj.SetValue(AllowEnableProperty, value);
    }
    private static void OnAllowEnableChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        FrameworkElement element = (FrameworkElement)sender;
    }
    #endregion
    #region Security Tags
    public static readonly DependencyProperty SecurityTagsProperty =
            DependencyProperty.RegisterAttached("SecurityTags",
            typeof(string), typeof(SecurityBehavior),
            new PropertyMetadata("", OnSecurityChanged));
    public static string GetSecurityTags(DependencyObject obj)
    {
        return (string)obj.GetValue(SecurityTagsProperty);
    }
    public static void SetSecurityTags(DependencyObject obj, string value)
    {
        obj.SetValue(SecurityTagsProperty, value);
    }
    private static void OnSecurityChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        bool canEnable = GetAllowEnable(sender); //<=============== Returns FALSE by default
        if (canEnable)
        {
            string[] tags = GetSecurityTags(sender).Split(TagSeparators, StringSplitOptions.RemoveEmptyEntries);
            foreach (string tag in tags)
            {
                canEnable &= SecurityService.HasRights(tag);
            }
        }
        var element = (UIElement)sender;
        element.IsEnabled = canEnable;
    }
    #endregion
}
If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

GeneralRe: Behavior/DP Question Pin
Richard Deeming2-Jul-20 0:32
mveRichard Deeming2-Jul-20 0:32 
GeneralRe: Behavior/DP Question Pin
Kevin Marois2-Jul-20 9:49
professionalKevin Marois2-Jul-20 9:49 
Question2 xaml windows question Pin
Michele Smith26-May-20 8:10
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AnswerRe: 2 xaml windows question Pin
#realJSOP26-May-20 8:43
mva#realJSOP26-May-20 8:43 
QuestionCreate DataGrid From List<T> With Properties As Columns Pin
Kevin Marois18-May-20 8:14
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AnswerRe: Create DataGrid From List<T> With Properties As Columns Pin
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QuestionWPF ListBox Pin
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AnswerRe: WPF ListBox Pin
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AnswerRe: WPF ListBox Pin
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QuestionDesign Question Pin
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QuestionMVVM: DataGrid Cell BeginEdit Pin
Kevin Marois13-Apr-20 10:10
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