wpfconverters Forum Rss Feed

New Post: Make Control Visible Only if Window Maximized

MichaelTR — Wed, 14 Nov 2012 16:42:49 GMT

I'm trying to collapse a control as long as the parent window is not maximized.

Here is what I have so far (collapsing if ActualHeight < 500) and is working:

<Window x:Class="TestApp.AnalyseWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:wpfconverter="clr-namespace:WpfConverter;assembly=WpfConverter"
        x:Name="thisControl"
        WindowState="Maximized"
        Height="600" Width="800"
        MinHeight="300" MinWidth="300">
    <DockPanel>
        <Label DockPanel.Dock="Bottom" Content="Only show when maximized">
            <Label.Visibility>
                <Binding>
                    <Binding.ElementName>thisControl</Binding.ElementName>
                    <Binding.Path>ActualHeight</Binding.Path>
                    <Binding.Converter>
                        <wpfconverter:ExpressionConverter>
                            <![CDATA[
                            {0}  < 500 ? "Collapsed" : "Visible"
                        ]]>
                        </wpfconverter:ExpressionConverter>
                    </Binding.Converter>
                </Binding>
            </Label.Visibility>
        </Label>
        <Label Content="Show always" />
    </DockPanel>
</Window>

But what I can't get to work is doing something like {0} == "Maximized" ? "Visible" : "Collapsed" on the binding path WindowState.

Can anybody tell me, how to do this on the WindowState of thisControl?

New Post: ExpressionConverter support string comparison?

kentcb — Mon, 03 Sep 2012 09:37:22 GMT

This is a supported scenario, but there are several syntactic problems with your code. Unfortunately, embedding expressions in XAML can be a bit of a nightmare, so it's often best to just place it inside a CDATA section:

    <Button>
        <Button.IsEnabled>
            <Binding>
                <Binding.Converter>
                    <con:ExpressionConverter>
                        <![CDATA[
                        {0} == "Custom"
                        ]]>
                    </con:ExpressionConverter>
                </Binding.Converter>
            </Binding>
        </Button.IsEnabled>
    </Button>

Of course, if you need this more than once (or even if you just prefer this aesthetically) you can define the converter as a resource and reference it from your binding:

    <Window.Resources>
        <con:ExpressionConverter x:Key="IsCustomConverter">
            <![CDATA[
            {0} == "Custom"
            ]]>
        </con:ExpressionConverter>
    </Window.Resources>
    
    <Button IsEnabled="{Binding Converter={StaticResource IsCustomConverter}}"/>

HTH,
Kent

New Post: ExpressionConverter support string comparison?

brinko99 — Tue, 28 Aug 2012 21:18:54 GMT

I was hoping to use the ExpressionConverter to perform a string comparison:

IsEnabled="{Binding Path=, Converter={con:ExpressionConverter {}{0}=='Custom'}}"

This does't work and gives the error: The argument name is missing. Can ExpressionConverter be used in some fashion like this? If not, might this be considered for a future release?

I found a workaround using the MapConverter as such:

<MenuItem.IsEnabled>
    <Binding>
        <Binding.Converter>
            <con:MapConverter>
                <con:Mapping From="Required">
                    <con:Mapping.To>
                        <System:Boolean>False</System:Boolean>
                    </con:Mapping.To>
                </con:Mapping>
                <con:Mapping From="Custom">
                    <con:Mapping.To>
                        <System:Boolean>True</System:Boolean>
                    </con:Mapping.To>
                </con:Mapping>
            </con:MapConverter>
        </Binding.Converter>
    </Binding>
</MenuItem.IsEnabled>

Thanks.

New Post: Feature request: Multi binding expression converter

weitzhandler — Wed, 18 Apr 2012 19:28:43 GMT

I should be able to set the other operand from binding, not only the first one.

The current expression converter only performs on one binding allowing the second operand to be only a constant (i.e. MyProperty * 2), in my scenario I need to perform arithmetic actions on where the 2nd operand is also a bound value, i.e:

<TextBlock>
    <TextBlock.Text>
        <Binding Path="CurrentAmount" StringFormat="P2">
            <Binding.Converter>
                <con:MultiExpressionConverter Operator="Divide" Operand="{Binding TotalAmount}"/>
            </Binding.Converter>
        </Binding>
    </TextBlock.Text>
</TextBlock>

New Post: Visibility Convert

weitzhandler — Wed, 04 Apr 2012 18:53:58 GMT

You can create such a converter once in your application/control resources with a key, then refer to it as a StaticResource:

<Control Visibility="{Binding IsVisible, Converter={StaticResource VisibilityConverter}}" />

Another option is to subclass the MapConverter/Binding, but then you would be better off implementing directly from IValueConverter.

A third option (which can also be combined witht the above), you can inherit from MarkupExtension (or IMarkupExtension<T> in SL5), and use it as a xaml markup extension, read this blog post for further details (applicable in WPF/SL5).

New Post: Visibility Convert

Tempeck — Wed, 04 Apr 2012 12:43:34 GMT

Thank you for your response. I'm using this but it is not very fast to write. Maybe some common convertions can be put in dll. For example,

bool to visibilityC true <=> Visibility.Visible false <=> Visibility.Collapsed

bool to visibilityH true <=> Visibility.Visible false <=> Visibility.Hidden

bool to inverseVisibilityC true <=> Visibility.Collapsed false <=> Visibility.Visible

bool to inverseVisibilityH true <=> Visibility.Hidden false <=> Visibility.Visible

bool to inverseBool true <=> false false <=> true

New Post: Silverlight Support

weitzhandler — Wed, 04 Apr 2012 02:56:12 GMT

Can you please add SL5 support as well?

Checkout my workitem.

New Post: Visibility Convert

weitzhandler — Tue, 03 Apr 2012 21:20:41 GMT

Your simplest bet is to use the MapConverter.

Should you have any problems or ideas, don't be a jerk keeping it to yourself but come back to share it with me!

<Control
    xmlns:boo="http://schemas.kent.boogaart.com/converters"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    Background="Red" Height="50" Width="50">
  <Control.Visibility>
    <Binding Path="Visibility">
      <Binding.Converter>
        <boo:MapConverter>
          <boo:Mapping To="Visible">
            <boo:Mapping.From>
              <Visibility>Collapsed</Visibility>
            </boo:Mapping.From>
          </boo:Mapping>
          <boo:Mapping To="Collapsed">
            <boo:Mapping.From>
              <Visibility>Visible</Visibility>
            </boo:Mapping.From>
          </boo:Mapping>
        </boo:MapConverter>
      </Binding.Converter>
    </Binding>
  </Control.Visibility>
</Control>

New Post: Visibility Convert

Tempeck — Tue, 03 Apr 2012 12:09:36 GMT

How can i convert Visibility.Collapsed to Visibility.Visible and Visibility.Visible to Visibility.Collapsed with this dll.

New Post: Does CaseConverter work with a TextBox?

brian_h — Mon, 24 Oct 2011 08:00:48 GMT

I am using WPF 4 and just downloaded the WPF Converters via Nuget, so I expect they are the latest too (Version property says 1.1.0.0. and Runtime Version says v4.0.30319. I just created a new WPF Application project and modified the MainWindow XAML as follows:

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:con="clr-namespace:Kent.Boogaart.Converters.Markup;assembly=Kent.Boogaart.Converters"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel>
            <TextBox Name="txtTest" Text="{Binding MyProperty, Converter={con:CaseConverter Upper}}"/>
            <Label Content="{Binding Text, ElementName=txtTest, Converter={con:CaseConverter Upper}}"/>
            <Label Content="{Binding Text, ElementName=txtTest, Converter={con:CaseConverter Lower}}"/>
        </StackPanel>
    </Grid>
</Window>

I modified the code behind as follows:

    public partial class MainWindow : Window
    {
        public String MyProperty { get; set; }
        public MainWindow()
        {
            InitializeComponent();

            DataContext = this;
        }
    }

 
The result is that the text box allows mixed case text to be typed (and does not change it to upper case), but the labels
force upper and lower case respectively (as expected). :(
 
Brian

New Post: Does CaseConverter work with a TextBox?

kentcb — Fri, 21 Oct 2011 13:09:58 GMT

What versions of WPF and WPF Converters are you using? I just tried this on WPF 4 with the latest WPF Converters and it worked fine.

Kent

New Post: Does CaseConverter work with a TextBox?

brian_h — Thu, 20 Oct 2011 14:08:34 GMT

Hi, I just noticed that TextBox has a CharacterCasing property, which does what I want, so I'm using that instead. However, I would still like to know why the converter doesn't work. :/

Brian

New Post: Does CaseConverter work with a TextBox?

brian_h — Thu, 20 Oct 2011 13:59:02 GMT

Hi, I have just tried the following XAML:

Both labels correctly convert the text to the appropriate case, but the TextBox itself doesn't seem to be affected. Am I doing something wrong?

Thanks,

Brian

New Post: Feature suggestion: Nullable(DateTimeOffset) <=> DateTime (local or UTC)

mayerwin — Tue, 11 Oct 2011 10:52:01 GMT

The title says it all.

New Post: MultiConverterGroup and MapConverter

kentcb — Mon, 05 Sep 2011 12:39:23 GMT

V1.1.0.0 supports the ternary conditional operator, which should alleviate this issue. For example, you could use an expression of:

{0} + 3 > {1} ? {2} : {3}

and then substitute in values for x, y and the desired Visibility values.

New Post: Silverlight Support

icnocop — Fri, 02 Sep 2011 23:34:56 GMT

Thanks to Kent, Silverlight is now supported in V1.1.0.0! :)

New Post: Silverlight Support

BelorusBY — Thu, 28 Jul 2011 14:39:53 GMT

Hi,

Can you please create a silverlight build?

P.S. Very usefull library. Extremely. Thanx a log

New Post: MultiConverterGroup and MapConverter

antidemon — Wed, 08 Jun 2011 09:45:59 GMT

I ran into the same issue.

The problem is that, although ConverterGroup will chain a series of IValueConverters, and MultiConverterGroup will chain a series of IMultiValueConverters together, there doesn't seem to be any way of chaining a series of IMultiValueConverters into an IValueConverter.

I finally used a workaround of a MultiBinding with my IMultiValueConverters into a Tag property and then binding my real target to the Tag using an IValueConverter.

I think MultiConverterGroup should have a Converter property which takes an IValueConverter and applies this to it's result before returning.

You could even then populate this property with a ConverterGroup and get another chain going!

In fact I think I will raise this through the issue tracker.

New Post: MultiConverterGroup and MapConverter

wpfwannabe — Wed, 03 Dec 2008 22:37:44 GMT

Just another thought... Shouldn't MapConverter also implement IMultiValueConverter so it could participate in a MultiConverterGroup?

New Post: MultiConverterGroup and MapConverter

wpfwannabe — Wed, 03 Dec 2008 22:34:34 GMT

Hi!

I have just found out today about this great library while in the middle of the process of rolling out my own similar thing. I immediately dropped all efforts and focused on a plethora of features this lib already offers.

While playing I wanted to solve my own simple-real-world-problem and I failed miserably. Thus I am now seeking help here.

I have two dependency properties that need to affect some Visibility property. Two properties are ints and the condition is something along the lines of X + 3 > Y. It looks like using a MultiBinding, ExpressionConverter and a MapConverter is the way to go but I keep failing in finding a proper way to do it. In order to do anything with TWO (or more) input properties one must use MultiBinding and thus MultiConverterGroup. An ExpressionConverter seems happy in a MultiConverterGroup but MapConverter (implementing just IValueConverter) is not happy. Basically I just want to translate boolean to Visibility.

Can somebody please point me in the right direction? Thanks!