Hi guys I am working on a project in C# WPF where I need to display a client's status in a listview
So I have the following enum that defines a Client Status
//Values used here for Bitwise Operations
public enum ClientStatus
{
NONE = 0,
NEWCLIENT = 1,
MONITORED = 2,
IMPORTAND = 4,
DISATISFIED = 8,
DETERIORATING = 16,
SATISFIED = 32
};
To Convert Each to a specific Brush I have the following code, Tested and it works
[ValueConversion(typeof(Enums.ClientStatus), typeof(Brush))]
public class StateValueColorConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
Brush Brush = Brushes.Red;
if (value is Enums.ClientStatus)
{
Enums.ClientStatus sv = (Enums.ClientStatus)value;
switch (sv)
{
case Enums.ClientStatus.IMPORTAND:
Brush = Brushes.Blue;
break;
case Enums.ClientStatus.MONITORED:
Brush = Brushes.Purple;
break;
case Enums.ClientStatus.NEWCLIENT:
Brush = Brushes.Orange;
break;
case Enums.ClientStatus.SATISFIED:
Brush = Brushes.Green;
break;
case Enums.ClientStatus.DETERIORATING:
Brush = Brushes.Yellow;
break;
case Enums.ClientStatus.DISATISFIED:
Brush = Brushes.Red;
break;
}
}
return Brush;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
to do the Binding I did the following, which is not what our lecturer exactly wanted
<GridViewColumn Header="Status" Width="110">
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBox Width="50" Background="{Binding Path=Status, Converter={StaticResource ColorConverter}}"></TextBox>
<TextBox Width="50" Background="{Binding Path=SatisFactory, Converter={StaticResource ColorConverter}}"></TextBox>
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
We need to display each of the enums as a different color however a client can have multiple statuses i.e
var status = ClientStatus.NEWCLIENT | ClientStatus.SATISFIED;
This will now return a int value of 33
My Problem now is I used two properties in my Client to show seperate statuses which is incorrect we need to use Bitwise Operations ie.
if ((status & ClientStatus.NEWCLIENT) == ClientStatus.NEWCLIENT)
{
//do whatever
}
so I can do the above code but how would I do the binding on one property to show multiple color's in the one gridviewcollumn, I search the forum but I missed it if this question or something similar was there
I am not really sure how to state the question so I will try it in other words
I want to display all selected enums in the column.
Thanks for any help or suggestions
Hope I made sence
If I understand your question correctly, you'd like to display an icon, image, or UI element for each value in the enumeration and have them be visible if the object's status matches that value.
I think I would create a simple StackPanel containing all the UI elements likes so:
<StackPanel Orientation="Horizontal">
<Rectangle Fill="Blue"
Visibility="{Binding Status,
Converter={StaticResource StatusToVisibilityConverter},
ConverterParameter=NEWCLIENT}" />
<Rectangle Fill="Green"
Visibility="{Binding Status,
Converter={StaticResource StatusToVisibilityConverter},
ConverterParameter=SATISFIED}" />
...
</StackPanel>
Then in your StatusToVisibilityConverter compare the value of Status with the value in ConverterParameter (you can convert that to you enumeration's value with TryParse static method.
Hope that helps.
Define DataTemplate name StatusDataTemplate, or a default DataTemplate for Enums.ClientStatus as TargetType.
In this template, define a 3 columns X 2 rows Grid.
In each grid cell, define a Border, having as background the binding using one of the 6 enum as ConverterParameter, with a converter that returns the 'right' color if value AND parameter = parameter, transparent otherwise.
Then you can use :
<ContentPresenter Content="{Binding Status}" />
... if you used a default DTpl
Or :
<ContentPresenter Content="{Binding Status}" ContentTemplate="{StaticResource StatusTemplate}"/>
Related
I am trying to create a re-usable user control (for data entry) in which there are two text boxes and they are linked to each by an IValueConvertor.
The following XAML is the original, normal code. This is what I am trying to reproduce in a user control.
<WrapPanel>
<TextBlock Text="Length of Fence"/>
<TextBox Name="Metric" Width="50" Text="{Binding Path=LengthFence, Mode=TwoWay}"/>
<TextBlock Text="Meters"/>
<TextBox Text="{Binding ElementName=Metric, Path=Text, Converter={StaticResource MetersToInches}, StringFormat=N8}"/>
<TextBlock Text="Inches"/>
</WrapPanel>
and the code-behind for the IValueConvertor (in MainWindow.xaml) is
public class MetersToInches : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value.ToString() == "")
return 0.0;
try
{
double meters = System.Convert.ToDouble(value);
var result = meters * 39.3701;
return result;
}
catch
{
// Catch errors when users type invalid expressions.
return 0.0;
}
}
public object ConvertBack(object value, Type targettype, object parameter, CultureInfo culture)
{
if (value.ToString() == "")
return 0.0;
try
{
double inches = System.Convert.ToDouble(value);
var result = inches * 0.0254;
return result;
}
catch
{
// Catch errors when users type invalid expressions.
return 0.0;
}
}
}
This is what this XAML looks like:
Now I have made a re-usable UserControl with three dependency properties Label for label string, Value for binding a property inside the ViewModel, and Units - a string property to show the input units.
<UserControl ...
x:Name="parent">
<StackPanel DataContext="{Binding ElementName=parent}">
<TextBlock Text="{Binding Path=Label}"/>
<TextBox Text="{Binding Path=Value}"/>
<TextBlock Text="{Binding Path=Units}"/>
</StackPanel>
However, this re-usable control can only tackle the first TextBox of the input. I do not know how to bind the IValueConvertor in the second TextBox. I need to do this because I want to bind other converters such as meters to feet, kg to pound, etc.
I have read that ConvertorParameter cannot be bound because it is not a dependency property and I am not sure if I can use multi-binding, mostly because I do not know how to use it properly Binding ConverterParameter.
I would be very grateful if you could show me how to do this or direct me to the appropriate link on StackOverflow or elsewhere that solves this problem. Or if there is a better way of doing this.
Many many thanks in advance.
First, don't bind the TextBoxes to each other (as in your original code at the begining of the question), instead, bind each TextBox to the same backing property, which, in your UserControl, is Value.
As for how to implement multiple bindings, you probably don't need a MultiBinding.
We have to pick a "standard" unit of measure to begin with- this will be the unit that will be actually stored in the property and in any database or file. I'll assume this standard unit will be meters (m). An IValueConverter can be used to convert between meters and some other unit of distance and back, using the ConverterParameter to specify which other unit to convert to/from.
Here's a good example to get you started.
public enum DistanceUnit { Meter, Foot, Inch, }
public class DistanceUnitConverter : IValueConverter
{
private static Dictionary<DistanceUnit, double> conversions = new Dictionary<DistanceUnit, double>
{
{ DistanceUnit.Meter, 1 },
{ DistanceUnit.Foot, 3.28084 },
{ DistanceUnit.Inch, 39.37008 }
};
//Converts a meter into another unit
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return conversions[(DistanceUnit)parameter] * (double)value;
}
//Converts some unit into a meter
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null) { return 0; }
double v;
var s = value as string;
if (s == null)
{
v = (double)value;
}
else
{
if (s == string.Empty) { return 0; }
v = double.Parse(s);
}
if (v == 0) { return 0; }
return v / conversions[((DistanceUnit)parameter)];
}
}
The above has a few problems. I never check if parameter really is a DistanceUnit before using it, for example. But it works.
Here's an example of how I used it:
<StackPanel>
<StackPanel.Resources>
<local:DistanceUnitConverter x:Key="DistCon"/>
</StackPanel.Resources>
<StackPanel Orientation="Horizontal">
<TextBox Text="{Binding Distance, Converter={StaticResource DistCon}, ConverterParameter={x:Static local:DistanceUnit.Meter}}" MinWidth="20"/>
<TextBlock>m</TextBlock>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBox Text="{Binding Distance, Converter={StaticResource DistCon}, ConverterParameter={x:Static local:DistanceUnit.Foot}}" MinWidth="20"/>
<TextBlock>ft</TextBlock>
</StackPanel>
</StackPanel>
The DistanceUnit enum and the internal conversions dictionary can be expanded with more units of measure. Alternatively, you can use a 3rd party library that already has all these included, like UnitsNet.
Not sure how you would like to bind mulitple converters in one single control. If i'm not wrong, you would like to build a control where when a user enters a particular value, you need to display it in different units. If this is the case, you can create a single converter with converterparameter as "m","cm","inch" etc and based on this you can return the result. Then in this case, you will have 4,5 controls and each will have same converter binding but different converter values. If this is not clear and you need further direction, please let know.
Multi Value binding
To answer your point 6, please see a sample multi binding converter and its implementation in xaml below. I have built a simple RolesFilter which will take different inputs from the xaml as object[] and since I already know what data is expected, i'm converting them in the converter.
public class RolesFilter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
try
{
FlipperObservableCollection<Role> _roles = (FlipperObservableCollection<Role>)values[0]; //Input
Department _dept_param = values[1] as Department;
bool _filter = (bool)values[2];
string _id = "NA";
if (values.Count() == 4 && values[3] is string) _id = (string)values[3] ?? "NA";
//If we need a filter, then without department, it should return empty results
if (!_filter) return _roles; //If no filter is required, then don't worry, go ahead with input values.
if (_dept_param == null) return new FlipperObservableCollection<Role>(); //If department is null, then
List<Role> _filtered_list = _roles.ToList().Where(p => p.department.id == _dept_param.id && p.id != _id)?.ToList() ?? new List<Role>();
return new FlipperObservableCollection<Role>(_filtered_list);
}
catch (Exception)
{
throw;
}
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
I'm using the multi value converter in the xaml as below. Here, i'm filtering an itemsource of a combo box based on another combobox and a check box. This is just an example and in your case, you can create a combo box with different Units values. Based on user selection, you can use the converter and return value to the textbox.
<ComboBox Height="30" SelectedItem="{Binding reports_to, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True, UpdateSourceTrigger=PropertyChanged}">
<ComboBox.ItemsSource>
<MultiBinding Converter="{StaticResource roles_filter}">
<Binding Source="{StaticResource SingletonData__}" Path="roles" NotifyOnSourceUpdated="True" UpdateSourceTrigger="PropertyChanged"/>
<Binding Path="department" NotifyOnSourceUpdated="True" UpdateSourceTrigger="PropertyChanged"/>
<Binding ElementName="cbx_filter" Path="IsChecked"/>
<Binding Path="id" NotifyOnSourceUpdated="True" UpdateSourceTrigger="PropertyChanged"/>
</MultiBinding>
</ComboBox.ItemsSource>
<ComboBox.ItemTemplate>
<DataTemplate>
<WrapPanel>
<TextBlock Text="{Binding department.name}"/>
<TextBlock Text=" - "/>
<TextBlock Text="{Binding name}"/>
</WrapPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
As of now, i assign the image of a TreeView item using a direct binding to the image's source:
<DataTemplate DataType="{x:Type local:GeoPoint}">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Color}" Height="32" />
<TextBlock Text="{Binding Name}" VerticalAlignment="Center"/>
</StackPanel>
</DataTemplate>
the Color binding is referring to string containing the path to the PNG, something like "/Resources/red.png"
i would like to make the Color variable of custom type "MarkerColor", an enum containing several colors, and have the image source binding reference this value, so that if
Color = MarkerColor.green; the binding would reference "/Resources/green.png"
Note that the name of the PNG is not necessarily the same as the name of MarkerColor, an "adapter" should be used to convert the type
I know how to do this in Java Android SDK, but not really sure on how to achive this in Wpf
You could create a converter that knows how to convert the enumeration value to a valid resource:
public class ColorResourceConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
MarkerColor color = (MarkerColor)value;
Uri uri;
switch(color)
{
case MarkerColor.Green:
uri = new Uri("Resources/green.png");
break;
case MarkerColor.Red:
uri = new Uri("Resources/red.png");
break;
//...
default:
uri = new Uri("Resources/default.png");
break;
}
return new BitmapImage(uri);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException();
}
}
Usage:
<DataTemplate DataType="{x:Type local:GeoPoint}">
<DataTemplate.Resources>
<local:ColorResourceConverter x:Key="ColorResourceConverter" />
</DataTemplate.Resources>
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Color, Converter={StaticResource ColorResourceConverter}}" Height="32" />
<TextBlock Text="{Binding Name}" VerticalAlignment="Center"/>
</StackPanel>
</DataTemplate>
I have a combobox which data source comes from a table in my DataBase. So, each item in my combo is an Object from the table. This Object have an attribute which corresponds to a string full of "1"s or "0"s. On the other hand I have a list of checkboxes inside of a ListBox with this template:
<ListBox Height="150" MinHeight="100" HorizontalAlignment="Center" Name="lstEstudios" VerticalAlignment="Top" Width="200"
ItemsSource="{Binding}" SelectionMode="Multiple" Margin="0,20,0,0">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox Name="chkEstudios" Width="Auto" Content="{Binding Path=Nom_estudio}"
Checked="chkEstudios_Checked" Unchecked="chkEstudios_Unchecked"/>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
I don´t know if it's possible but, that I want to do is, for each "1" or "0" in the attribute set the checkbox checked or unchecked depending if there is a "1" check the checkbox or if is "0" uncheck the checkbox, and so on... with all the checkboxes in the ListBox, how to do that ?
I tried the same thing with my own sample having a CustomTask class.
<ListBox ItemsSource="{Binding CustomTasks}">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox IsChecked="{Binding TaskStatus, Converter={x:Static testApp:StatusToBooleanConverter.Instance}}" Content="{Binding TaskStatus}"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
where the TaskStatus is a boolean of two values, i.e Completed and Pending.
and here is the code for the converter
public class StatusToBooleanConverter : IValueConverter
{
public static StatusToBooleanConverter Instance = new StatusToBooleanConverter();
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value is Status)
{
switch ((Status)value)
{
case Status.Completed:
return true;
case Status.Pending:
return false;
}
return null;
}
return null;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Just try this out. Hope that helps.
This is a good place to use a converter. If you have a property with 1's and 0's in it and you want to translate those to true/false for the checked attribute then try making converters to do the work. The basic idea behind a converter is to take an input value (from a bound property) and, as the name implies, convert it to a different value. You can make them as simple or complicated as you would like, and turning "1" into true and "0" into false should be pretty quick.
You will bind the IsChecked attribute of the checkbox to your source of 1's and 0's and in the binding also use the converter.
If you haven't made a value converter before here is a nice tutorial on making one: http://wpftutorial.net/ValueConverters.html
I have a ListBox, which uses data binding for content (bound to an ObservableCollection), and an ItemTemplate for layout. Within the ItemTemplate, there is a TextBlock displaying a date (from the ObservableCollection), and a colored Rectangle.
I want the rectangle's fill color to change based on the date (to indicate age). However, since the Rectangle itself isn't bound to the date (and I don't see how it could be), I haven't been able to get a DataTrigger to work to alter the fill color.
Is there another way to get the Rectangle color to be controlled by the data binding?
Edit:
Here is a (simplified) copy of my ListBox ItemTemplate, as requested. Right now, the Rectangle's fill is a set color, but I want to change it to vary based on the targetstartdate field.
<ListBox Name="listBox1" ItemsSource="{Binding Path=testList}">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="1*" />
</Grid.ColumnDefinitions>
<Rectangle Fill="#FF009A00" Width="5" StrokeThickness="1" Margin="0,1,4,1"/>
<TextBlock Text="{Binding targetstartdate}" Margin="0,0,0,4" Foreground="#FF009A00" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
You can bind the rectangle's Fill or Stroke property to the Date. Then, use an IValueConverter to convert the date to the appropriate color.
<Window.Resources>
<local:DateToBrushConverter x:Key="DateToBrushConverter" />
</Window.Resources>
<Rectangle Fill="{Binding targetstartdate,Converter={StaticResource DateToBrushConverter}}"
... />
The Convert method should return a Brush object, which matches the Rectangle.Fill property.
public class DateToBrushConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var date = value as DateTime?;
if (!date.HasValue)
return new SolidColorBrush(Colors.Transparent);
else if (!date.Value > DateTime.Today.AddDays(-1))
return new SolidColorBrush(Colors.Blue);
// etc
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Bind rectangle's color to an IValueConverter, use the date as binding and determine the color based on the date inside the IValueConverter class.
I have an abstract UserControl that I want to show a ToolTip on. This ToolTip should be different based on the Type of the DataContext which is defined in the derived UserControls.
Is there a way to define a different ToolTip for each type in the base class? If not, how can I set this ToolTip in the derived UserControl?
Here is how I thought I would go:
<UserControl ...
<UserControl.ToolTip>
<DataTemplate DataType="{x:Type Library:Event}">
<StackPanel>
<TextBlock FontWeight="Bold" Text="{Binding Name}" />
<TextBlock>
<TextBlock.Text>
<Binding Path="Kp" StringFormat="{}Kp: {0}m" />
</TextBlock.Text>
</TextBlock>
</StackPanel>
</DataTemplate>
</UserControl.ToolTip>
</UserControl>
Couldn't you author a custom ValueConverter that returns the information you'd like to display for the type?
You could 'fancy this up' a bit to allow the converter to accept data templates like you're suggesting, but this will totally enable your scenario.
First, create the value converter. Pardon my quick code:
public class ToolTipConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
UIElement tip = null;
if (value != null)
{
// Value is the data context
Type t = value.GetType();
string fancyName = "Unknown (" + t.ToString() + ")";
// Can use IsInstanceOf, strings, you name it to do this part...
if (t.ToString().Contains("Person"))
{
fancyName = "My custom person type";
};
// Could create any visual tree here for the tooltip child
TextBlock tb = new TextBlock
{
Text = fancyName
};
tip = tb;
}
return tip;
}
public object ConvertBack(object o, Type t, object o2, CultureInfo ci)
{
return null;
}
}
Then instantiate it in your user control's resources (I defined the xmlns "local" to be this namespace and assembly):
<UserControl.Resources>
<local:ToolTipConverter x:Key="toolTipConverter" />
</UserControl.Resources>
And make sure the root visual of your user control binds its ToolTip property:
<Grid
ToolTip="{Binding Converter={StaticResource toolTipConverter}}"
Background="Blue">
<!-- stuff goes here -->
</Grid>
Although it's a really old post, I'll still post my answer, as I was facing the same problem today. Basically I ended up with putting all my tooltip templates into resourses, like the author of the question did. For this really to work there was a missing binding for the tooltip content and a resources section. With these in place, temlates do actually get applied.
<UserControl ...
<UserControl.ToolTip>
<Tooltip Content="{Binding}">
<Tooltip.Resources>
<DataTemplate DataType="{x:Type Type1}">
...
</DataTemplate>
<DataTemplate DataType="{x:Type Type2}">
...
</DataTemplate>
</Tooltip.Resources>
</Tooltip>
</UserControl>