ErrorMessage displayed behind WindowsFormsHost

[Feutou]

Hello,

On my MetroWindow, I have a dockpanel with lastchildFill = true and the lastChild is a WindowsFormsHost containing a ReportViewer.

When an exception occurs, I display the message by calling the extension method of MetroWindow ShowMessageAsync.

But in this case, the dialog message is displayed behind the windowsFormsHost.

Did I do something wrong? Do you reproduce this behaviour? I suppose that it exists a trick to avoid that?

[timunie]

Hi @Feutou can you provide a sample here on github which shows your issue?

Thank you and happy coding Tim

[Feutou]

Hello, Thank you.

I said, messagebox behind windowsFormsHost, but I think that's displayed behind the reportviewer.

Here is the xaml of this Window

<metro:MetroWindow
    x:Class="ImpressionCertificats.Windows.PrintSelectorFicheProductionWindow"
    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:vm="clr-namespace:ImpressionCertificats.ViewModel"
    xmlns:local="clr-namespace:ImpressionCertificats.Windows"
    xmlns:ig="http://schemas.infragistics.com/xaml"
    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
    xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
    xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Platform"
    xmlns:Printing="clr-namespace:System.Drawing.Printing;assembly=System.Drawing"
    xmlns:dialogs="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
    xmlns:metro="http://metro.mahapps.com/winfx/xaml/controls"
    xmlns:rv="clr-namespace:Microsoft.Reporting.WinForms;assembly=Microsoft.ReportViewer.WinForms"
    mc:Ignorable="d"
    d:DesignWidth="673.893"
    d:DesignHeight="398.774"
    x:Name="PrinterWindow"
    ShowInTaskbar="{Binding DisplayInTaskBar}">
    <i:Interaction.Triggers>
        <i:EventTrigger
            EventName="Closing">
            <ei:CallMethodAction
                TargetObject="{Binding}"
                MethodName="WindowsClosing" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
    <metro:MetroWindow.Resources>
        <Style
            TargetType="{x:Type Button}"
            BasedOn="{StaticResource MetroButton}">
            <Setter
                Property="Width"
                Value="70" />
        </Style>
    </metro:MetroWindow.Resources>
    <DockPanel
        Margin="5"
        LastChildFill="True">
        <Grid
            Margin="5"
            DockPanel.Dock="Top">
            <Grid.ColumnDefinitions>
                <ColumnDefinition
                    Width="*" />
                <ColumnDefinition
                    Width="2*" />
            </Grid.ColumnDefinitions>
            <Label
                Grid.Column="0"
                Grid.Row="0"
                VerticalAlignment="Center"
                HorizontalAlignment="Left"
                Content="Imprimante :" />
            <ComboBox
                Grid.Column="1"
                Grid.Row="0"
                MinWidth="200"
                HorizontalAlignment="Stretch"
                VerticalAlignment="Center"
                ItemsSource="{Binding PrinterDevices,Mode=OneTime}"
                SelectedItem="{Binding SelectedPrinterDevice,Mode=TwoWay,NotifyOnValidationError=True,ValidatesOnDataErrors=True}"
                Height="26" />

        </Grid>
        <StackPanel
            DockPanel.Dock="Bottom"
            VerticalAlignment="Bottom"
            HorizontalAlignment="Right"
            Grid.Row="2"
            Grid.Column="1"
            Orientation="Horizontal">
            <Button
                Content="Ok"
                IsDefault="True"
                Command="{Binding PrintCommand}"
                Margin="5" />
            <Button
                Content="Annuler"
                IsCancel="True"
                Command="{Binding CancelCommand}"
                IsEnabled="{Binding CanCancel}"
                Margin="5" />
            <Button
                Content="Fermer"
                IsCancel="True"
                Command="{Binding CloseWindowCommand}"
                CommandParameter="{Binding ElementName=PrinterWindow}"
                Margin="5" />
        </StackPanel>
        <DockPanel
            Background="red"
            Margin="5"
            LastChildFill="True">
            <StackPanel
                DockPanel.Dock="Top"
                Orientation="Horizontal">
                <Label
                    Content="Numéro de document :" />
                <Label
                    Content="{Binding NumDocument}" />
            </StackPanel>
            <WindowsFormsHost
                Margin="70"
                Background="green">
                <rv:ReportViewer
                    Margin="5,5,5,5"
                    x:Name="Viewer"
                    ProcessingMode="Local"
                    ShowBackButton="False"
                    ShowFindControls="False"
                    ShowPageNavigationControls="true"
                    ShowRefreshButton="False"
                    ShowPrintButton="False" />
            </WindowsFormsHost>
        </DockPanel>
    </DockPanel>
</metro:MetroWindow>

what I have in the designer

What I have when I display a message

[timunie]

Hi @Feutou this seems to be impossible as far as I can see. It seems to be a limitation which comes from WPF itself: https://stackoverflow.com/questions/9920480/windowsformshost-is-always-the-most-top-from-wpf-element

Please leave this issue open anyway, maybe someone else has a workaround for this.

[batzen]

Fluent.Ribbon had the same issue when showing the Backstage (which is shown in an adorner). To overcome such issues every HwndHost (which WindowsFormsHost inherits) in the same window gets collapsed when showing the backstage. Maybe MahApps.Metro could do the same? The code for that can be found at https://github.com/fluentribbon/Fluent.Ribbon/blob/develop/Fluent.Ribbon/Controls/Backstage.cs#L703