WPF Addict

ToolTips with StringFormat when it’s don’t work

30/08/2020 admin Aucun commentaire

If you want bind a tooltip with value and have a StringFormat of a slider for exemple… the StringFormat is not apply (for tag or another property it’s the same behavior)
For solve it use this code

<Slider x:Name="slider"
        HorizontalAlignment="Left"
        Background="LightCoral"
        Height="29"
        Margin="37,162,0,0"
        TickFrequency="1"
        Tag="{Binding Value, RelativeSource={RelativeSource Self}, StringFormat=N2}"
        VerticalAlignment="Top"
        Value="0"
        Width="350">
        <Slider.ToolTip>
           <ToolTip DataContext="{Binding Path=PlacementTarget, RelativeSource={RelativeSource Self}}">
              <TextBlock Text="{Binding Value, StringFormat=N2}" />
            </ToolTip>
        </Slider.ToolTip>
 </Slider>

<Slider x:Name="slider"

HorizontalAlignment="Left"

Background="LightCoral"

Height="29"

Margin="37,162,0,0"

TickFrequency="1"

Tag="{Binding Value, RelativeSource={RelativeSource Self}, StringFormat=N2}"

VerticalAlignment="Top"

Value="0"

Width="350">

<Slider.ToolTip>

</ToolTip>

</Slider.ToolTip>

</Slider>

tag is set for see result

Categories: Non classé Tags:

ToolTip on moving thumb for slider

28/08/2020 admin Aucun commentaire

I try to find a solution for having in slider a tooltip moving under thumb when i drag it

after reading somes post like :https://stackoverflow.com/questions/1178134/wpf-adding-a-tooltip-to-the-track-of-a-slider
i think that restyle slider is not a good solution when you using already restyled slider as mahapp for example
and microsoft good explain for tooltip position : https://docs.microsoft.com/fr-fr/dotnet/framework/wpf/controls/how-to-position-a-tooltip

So i find a better solution (more simple) with an attached property

 public class SliderHelper
    {
        #region ShowToolTipOnMoving (ATTACHED)
        public static bool GetShowToolTipOnMoving(DependencyObject obj) => (bool)obj.GetValue(ShowToolTipOnMovingProperty);
        public static void SetShowToolTipOnMoving(DependencyObject obj, bool value) => obj.SetValue(ShowToolTipOnMovingProperty, value);

        // Using a DependencyProperty as the backing store for ShowToolTipOnMoving.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ShowToolTipOnMovingProperty =
            DependencyProperty.RegisterAttached(
                "ShowToolTipOnMoving",
                typeof(bool),
                typeof(SliderHelper),
                new FrameworkPropertyMetadata(false
            //,FrameworkPropertyMetadataOptions.AffectsRender
            , (d, e) =>
            {
                if (d is Slider slider)
                {
                    slider.Loaded += (ss, ee) =>
                    {
                        // find thumb
                        ToolTip tooltip = new ToolTip();
                        Thumb thumb = FindVisualChildren<Thumb>(slider).First();
                        thumb.DragStarted += (sss, eee) =>
                        {
                            tooltip.Content = (int)slider.Value;                           
                            tooltip.HorizontalOffset = 0;
                            tooltip.Placement = PlacementMode.Bottom;
                            tooltip.PlacementTarget = thumb;
                            tooltip.PlacementRectangle = new Rect(-(thumb.ActualWidth / 2), thumb.ActualHeight + 2, 0, 0);
                            tooltip.IsOpen = true;
                            tooltip.StaysOpen = true;                            
                        };
                        thumb.DragCompleted += (sss, eee) =>
                       {
                           tooltip.IsOpen = false;
                           tooltip.StaysOpen = false;
                       };
                        thumb.DragDelta += (sss, eee) =>
                        {
                            tooltip.Content = (int)slider.Value;
                            tooltip.HorizontalOffset += 0.1;
                            tooltip.HorizontalOffset -= 0.1;
                        };
                    };
                }
            }
            ));
        #endregion

        #region STATIC Functions
        public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject
        {
            if (depObj != null)
            {
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                    if (child != null && child is T)
                    {
                        yield return (T)child;
                    }

                    foreach (T childOfChild in FindVisualChildren<T>(child))
                    {
                        yield return childOfChild;
                    }
                }
            }
        }
        #endregion
    }

public class SliderHelper

{

#region ShowToolTipOnMoving (ATTACHED)

public static bool GetShowToolTipOnMoving(DependencyObject obj) => (bool)obj.GetValue(ShowToolTipOnMovingProperty);

public static void SetShowToolTipOnMoving(DependencyObject obj, bool value) => obj.SetValue(ShowToolTipOnMovingProperty, value);

// Using a DependencyProperty as the backing store for ShowToolTipOnMoving. This enables animation, styling, binding, etc...

public static readonly DependencyProperty ShowToolTipOnMovingProperty =

DependencyProperty.RegisterAttached(

"ShowToolTipOnMoving",

typeof(bool),

typeof(SliderHelper),

new FrameworkPropertyMetadata(false

//,FrameworkPropertyMetadataOptions.AffectsRender

, (d, e) =>

{

if (d is Slider slider)

{

slider.Loaded += (ss, ee) =>

{

// find thumb

ToolTip tooltip = new ToolTip();

Thumb thumb = FindVisualChildren<Thumb>(slider).First();

thumb.DragStarted += (sss, eee) =>

{

tooltip.Content = (int)slider.Value;

tooltip.HorizontalOffset = 0;

tooltip.Placement = PlacementMode.Bottom;

tooltip.PlacementTarget = thumb;

tooltip.PlacementRectangle = new Rect(-(thumb.ActualWidth / 2), thumb.ActualHeight + 2, 0, 0);

tooltip.IsOpen = true;

tooltip.StaysOpen = true;

};

thumb.DragCompleted += (sss, eee) =>

{

tooltip.IsOpen = false;

tooltip.StaysOpen = false;

};

thumb.DragDelta += (sss, eee) =>

{

tooltip.Content = (int)slider.Value;

tooltip.HorizontalOffset += 0.1;

tooltip.HorizontalOffset -= 0.1;

};

}

));

#endregion

#region STATIC Functions

public static IEnumerable<T> FindVisualChildren<T>(DependencyObject depObj) where T : DependencyObject

{

if (depObj != null)

{

for (int i = 0; i < VisualTreeHelper.GetChildrenCount(depObj); i++)

{

DependencyObject child = VisualTreeHelper.GetChild(depObj, i);

if (child != null && child is T)

{

yield return (T)child;

}

foreach (T childOfChild in FindVisualChildren<T>(child))

{

yield return childOfChild;

}

#endregion

}

and using like this

  <Slider HorizontalAlignment="Left"
                Height="29"
                Margin="37,293,0,0"
                TickFrequency="1"
                IsSnapToTickEnabled="True"
                VerticalAlignment="Top"
                Value="5"
                Width="350"
                local:SliderHelper.ShowToolTipOnMoving="true"
                ToolTip="{Binding Value, RelativeSource={RelativeSource Self}}" />

<Slider HorizontalAlignment="Left"

Height="29"

Margin="37,293,0,0"

TickFrequency="1"

IsSnapToTickEnabled="True"

VerticalAlignment="Top"

Value="5"

Width="350"

local:SliderHelper.ShowToolTipOnMoving="true"

ToolTip="{Binding Value, RelativeSource={RelativeSource Self}}" />

we can find many improvment about this helper, but this is the first draft

Categories: Non classé Tags:

Draw lines at real pixel position

18/08/2020 admin Aucun commentaire

If you want to draw lines in OnRender function for sample, you have a antialiasing and you can’t have a real position (at pixel)

with this code (find in https://stackoverflow.com/questions/6018106/wpf-drawingcontext-seems-ignore-snaptodevicepixels) you can solve it

 public static class SnapDrawingExtensions
    {
        public static void DrawSnappedLinesBetweenPoints(this DrawingContext dc,
            Pen pen, double lineThickness, params Point[] points)
        {
            var guidelineSet = new GuidelineSet();
            foreach (var point in points)
            {
                guidelineSet.GuidelinesX.Add(point.X);
                guidelineSet.GuidelinesY.Add(point.Y);
            }
            var half = lineThickness / 2;
            points = points.Select(p => new Point(p.X + half, p.Y + half)).ToArray();
            dc.PushGuidelineSet(guidelineSet);
            for (var i = 0; i < points.Length - 1; i = i + 2)
            {
                dc.DrawLine(pen, points[i], points[i + 1]);
            }
            dc.Pop();
        }
    }

public static class SnapDrawingExtensions

{

public static void DrawSnappedLinesBetweenPoints(this DrawingContext dc,

Pen pen, double lineThickness, params Point[] points)

{

var guidelineSet = new GuidelineSet();

foreach (var point in points)

{

guidelineSet.GuidelinesX.Add(point.X);

guidelineSet.GuidelinesY.Add(point.Y);

}

var half = lineThickness / 2;

points = points.Select(p => new Point(p.X + half, p.Y + half)).ToArray();

dc.PushGuidelineSet(guidelineSet);

for (var i = 0; i < points.Length - 1; i = i + 2)

{

dc.DrawLine(pen, points[i], points[i + 1]);

}

dc.Pop();

}

and code sample

   protected override void OnRender(DrawingContext drawingContext)
        {
            base.OnRender(drawingContext)                ;
            Pen p = new Pen(Brushes.Black, 1);
            List<Point> pts = new List<Point>();
            for (double x = 0; x < this.ActualWidth; x+= 10)
            {
                pts.Add(new Point(x, 0));
                pts.Add(new Point(x, this.ActualHeight));
            }
            drawingContext.DrawSnappedLinesBetweenPoints(p, 1.0, pts.ToArray());
        }

protected override void OnRender(DrawingContext drawingContext)

{

base.OnRender(drawingContext) ;

Pen p = new Pen(Brushes.Black, 1);

List<Point> pts = new List<Point>();

for (double x = 0; x < this.ActualWidth; x+= 10)

{

pts.Add(new Point(x, 0));

pts.Add(new Point(x, this.ActualHeight));

}

drawingContext.DrawSnappedLinesBetweenPoints(p, 1.0, pts.ToArray());

}

Categories: Non classé Tags:

Converter is a Markup

01/08/2020 admin Aucun commentaire

If you want simplify your code it’s better to make a converter who is also a markup

Previous code for converter

public class BoolToVisivilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (bool)value ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

public class BoolToVisivilityConverter : IValueConverter

{

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

{

return (bool)value ? Visibility.Visible : Visibility.Collapsed;

}

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

{

throw new NotImplementedException();

}

Previous code for xaml

<Grid  Margin="10,245,0,0"
               HorizontalAlignment="Left"
               VerticalAlignment="Top">
            <Grid.Resources>
                <local:BoolToVisivilityConverter x:Key="btvc" />
            </Grid.Resources>
            <TextBox Width="772"
                     Height="52"
                     Text="{Binding Dossier, FallbackValue=xxxxx}"
                     TextWrapping="Wrap"
                     Visibility="{Binding IsVisible, Converter={StaticResource btvc}}" />
        </Grid>

<Grid Margin="10,245,0,0"

HorizontalAlignment="Left"

VerticalAlignment="Top">

<Grid.Resources>

<local:BoolToVisivilityConverter x:Key="btvc" />

</Grid.Resources>

<TextBox Width="772"

Height="52"

Text="{Binding Dossier, FallbackValue=xxxxx}"

TextWrapping="Wrap"

Visibility="{Binding IsVisible, Converter={StaticResource btvc}}" />

</Grid>

And new code for converter

 public class BoolToVisivilityMarkupConverter : MarkupExtension, IValueConverter
    {
        public override object ProvideValue(IServiceProvider serviceProvider) => this;

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (bool)value ? Visibility.Visible : Visibility.Collapsed;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

public class BoolToVisivilityMarkupConverter : MarkupExtension, IValueConverter

{

public override object ProvideValue(IServiceProvider serviceProvider) => this;

public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

{

return (bool)value ? Visibility.Visible : Visibility.Collapsed;

}

public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

{

throw new NotImplementedException();

}

and xaml

 <TextBox HorizontalAlignment="Left"
                 Height="38"
                 Margin="10,320,0,0"
                 TextWrapping="Wrap"
                 Text="{Binding Dossier, FallbackValue=xxxxx}"
                 VerticalAlignment="Top"
                 Width="772"
                 Visibility="{Binding IsVisible, Converter={local:BoolToVisivilityMarkupConverter}}" />

<TextBox HorizontalAlignment="Left"

Height="38"

Margin="10,320,0,0"

TextWrapping="Wrap"

Text="{Binding Dossier, FallbackValue=xxxxx}"

VerticalAlignment="Top"

Width="772"

Visibility="{Binding IsVisible, Converter={local:BoolToVisivilityMarkupConverter}}" />

see the difference

Categories: Non classé Tags:

Archive

ToolTips with StringFormat when it’s don’t work

ToolTip on moving thumb for slider

Draw lines at real pixel position

Converter is a Markup

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