Tag Archives: wpf

WPF: How to Implement Table Style with DataGrid

resource

Define colors and styles


<SolidColorBrush x:Key="TextColorGeneral" Color="#a2a2a2" />


<Style TargetType="DataGridColumnHeader">
    <Setter Property="HorizontalContentAlignment" Value="Center" />
    <Setter Property="BorderBrush" Value="#a8a8a8" />
    <Setter Property="Background" Value="#f2f2f2" />
    <Setter Property="FontSize" Value="15" />
    <Setter Property="Padding" Value="5" />
    <Setter Property="Foreground" Value="{StaticResource TextColorGeneral}" />
    <Setter Property="BorderThickness" Value="0,0,1,1" /> // Important!
</Style>

Set dataGrid properties


<DataGrid
        Grid.Row="5"
        d:ItemsSource="{StaticResource testItems}"
        AutoGenerateColumns="False"
        BorderBrush="#a8a8a8"
        CanUserAddRows="False"
        CanUserReorderColumns="False"
        CanUserResizeColumns="False"
        HeadersVisibility="Column"
        ItemsSource="{Binding CalibrationItems}"
        SelectionMode="Single"
        SelectionUnit="Cell"
        Style="{StaticResource BaseStyle}"
        BorderThickness="1,1,0,0" // Important!
        HorizontalGridLinesBrush="#a8a8a8" // Important!
        VerticalGridLinesBrush="#a8a8a8"> // Important!
</DataGrid>

renderings

[Solved] RuntimeError: An attempt has been made to start a new process before the current process…

When running the Pytorch expression recognition code during hands-on training, the following error occurred:

RuntimeError:
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.
 
        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper idiom
        in the main module:
 
            if __name__ == '__main__':
                freeze_support()
                ...
 
        The "freeze_support()" line can be omitted if the program
        is not going to be frozen to produce an executable.

Here is to take multi-threaded tasks, using a single thread to complete, the solution is also very simple, there are the following two.
1. remove the num_workers parameter

train_dataloader = torch.utils.data.DataLoader(train_dataset,batch_size=batchsize,shuffle=True,num_workers=0)
val_dataloader = torch.utils.data.DataLoader(val_dataset,batch_size=100,shuffle=False,num_workers=0)

2. Add if __name__=='__main__' before epoch :

if __name__ == '__main__':
    for epoch in range(epochs):
        loss = 0.0
        acc = 0.0
        n = 0
        for image,label in train_dataloader:

Then it can run normally.

[Solved] ANSYS error: accelerations are exceeding internal limit

The errors reported by ANSYS during simulation are as follows

Find some information:

Finally, the problem found: I can’t use too fast speed for my corresponding structure. When I change it to 1, there’s no problem

Click Insert probe to calculate the generated displacement and deformation:

WPF path = (validation. Errors) [0]. Errorcontent reports a binding error

System.Windows.Data Error: 17 : Cannot get ‘Item[]’ value (type ‘ValidationError’) from ‘(Validation.Errors)’ (type ‘ReadOnlyObservableCollection`1′). BindingExpression:Path=AdornedElement.(0)[0].ErrorContent; DataItem=’AdornedElementPlaceholder’ (Name=’customAdorner’); target element is ‘TextBlock'(Name=”); target property is ‘Text’ (type ‘String’) ArgumentOutOfRangeException:’System.ArgumentOutOfRangeException: The specified parameter is out of the range of valid values.

Correct binding method:

Path=(Validation.Errors)/ErrorContent

Two methods of fixing WPF menu bar after scrolling to the top

Recently, there is a requirement in the project:

The menu bar is fixed at the top after scrolling to the top.. This is quite common on the mobile end

Look at the effect:

Let’s take a look at the code. There are not many codes

The first method is as follows:

Write a menu as like as two peas, and hide it on top of the window. When the menu is rolled up to the top, it will be displayed, otherwise hidden. br>

Mainwindow1.xaml is as follows:

<Window x:Class="wpfcore.MainWindow1"
        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:local="clr-namespace:wpfcore"
        mc:Ignorable="d"
        Title="MainWindow1" Height="450" Width="800">
    <Grid>
        <ScrollViewer ScrollChanged="ScrollViewer_ScrollChanged">
            <Grid>
                <Grid.RowDefinitions>
                    <RowDefinition Height="200"/>
                    <RowDefinition Height="auto"/>
                    <RowDefinition Height="*"/>
                </Grid.RowDefinitions>
                <Grid Grid.Row="0" x:Name="banner">
                    <Image Source="D:\bizhi\123\2-9.jpg" Stretch="UniformToFill" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30" Foreground="White" Text="这是顶部Banner"/>
                </Grid>
                <StackPanel Grid.Row="1" Panel.ZIndex="100" x:Name="menu" Orientation="Horizontal" TextBlock.FontSize="18" Background="LightBlue">
                    <TextBlock Text="Home" Margin="10"></TextBlock>
                    <TextBlock Text="Editor" Margin="10"></TextBlock>
                    <TextBlock Text="Viewer" Margin="10"></TextBlock>
                    <TextBlock Text="Debug" Margin="10"></TextBlock>
                    <TextBlock Text="WPF UI" Margin="10"></TextBlock>
                </StackPanel>
                <Border Height="1000" Grid.Row="22">
                    <Border.Background>
                        <LinearGradientBrush>
                            <GradientStop Color="Red" Offset="0"/>
                            <GradientStop Color="Green" Offset="0.5"/>
                            <GradientStop Color="Blue" Offset="1"/>
                        </LinearGradientBrush>
                    </Border.Background>
                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30" Foreground="White" Text="这是顶部Banner"/>
                </Border>
            </Grid>
        </ScrollViewer>
        <StackPanel x:Name="topMenu" VerticalAlignment="Top" Visibility="Hidden" Orientation="Horizontal" TextBlock.FontSize="18" Background="LightBlue">
            <TextBlock Text="Home" Margin="10"></TextBlock>
             <TextBlock Text="Editor" Margin="10"></TextBlock>
             <TextBlock Text="Viewer" Margin="10"></TextBlock>
             <TextBlock Text="Debug" Margin="10"></TextBlock>
            <TextBlock Text="WPF UI" Margin="10"></TextBlock>
        </StackPanel>
    </Grid>
</Window>

Mainwindow1.cs Code:

using System.Windows;


namespace wpfcore
{
    public partial class MainWindow1 : Window
    {
        public MainWindow1()
        {
            InitializeComponent();
        }
        private void ScrollViewer_ScrollChanged(object sender, System.Windows.Controls.ScrollChangedEventArgs e)
        {
            if (e.VerticalOffset > banner.ActualHeight)
            {
                 topMenu.Visibility = Visibility.Visible;
            }
            else
            {
                topMenu.Visibility = Visibility.Hidden;
            }
        }
    }
}

—————Dividing line——————

Second method:

Add render transform to the menu bar. When the menu scrolls to the top, set translatetransform. Yproperty The same effect was achieved

Mainwindow.xaml code is as follows:

<Window x:Class="wpfcore.MainWindow"
        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:local="clr-namespace:wpfcore" 
        xmlns:controls="http://metro.mahapps.com/winfx/xaml/controls"
        mc:Ignorable="d"
        UseLayoutRounding="True"
        Title="MainWindow" Width="600" Height="340">
    <Grid>
        <ScrollViewer ScrollChanged="ScrollViewer_ScrollChanged">
            <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="200"/>
                <RowDefinition Height="auto"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <Grid Grid.Row="0" x:Name="banner">
                <Image Source="D:\bizhi\123\2-9.jpg" Stretch="UniformToFill" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30" Foreground="White" Text="这是顶部Banner"/>
            </Grid>
            <StackPanel Grid.Row="1" Panel.ZIndex="100" x:Name="menu" Orientation="Horizontal" TextBlock.FontSize="18" Background="LightBlue">
                    <StackPanel.RenderTransform>
                        <TranslateTransform x:Name="menuTranslate" Y="0.0"/>
                    </StackPanel.RenderTransform>
                    <TextBlock Text="Home" Margin="10"></TextBlock>
                    <TextBlock Text="Editor" Margin="10"></TextBlock>
                    <TextBlock Text="Viewer" Margin="10"></TextBlock>
                    <TextBlock Text="Debug" Margin="10"></TextBlock>
                    <TextBlock Text="WPF UI" Margin="10"></TextBlock>
                </StackPanel>
            <Border Height="1000" Grid.Row="22">
                <Border.Background>
                    <LinearGradientBrush>
                        <GradientStop Color="Red" Offset="0"/>
                        <GradientStop Color="Green" Offset="0.5"/>
                        <GradientStop Color="Blue" Offset="1"/>
                    </LinearGradientBrush>
                </Border.Background>
                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30" Foreground="White" Text="这是顶部Banner"/>
                </Border>
        </Grid>
    </ScrollViewer>
        <StackPanel x:Name="topMenu" VerticalAlignment="Top" Visibility="Hidden" Orientation="Horizontal" TextBlock.FontSize="18" Background="LightBlue">
            <TextBlock Text="Home" Margin="10"></TextBlock>
            <TextBlock Text="Editor" Margin="10"></TextBlock>
            <TextBlock Text="Viewer" Margin="10"></TextBlock>
            <TextBlock Text="Debug" Margin="10"></TextBlock>
            <TextBlock Text="WPF UI" Margin="10"></TextBlock>
        </StackPanel>
    </Grid>
</Window>

Mainwindow.cs Code:

using System.Windows;
using System.Windows.Media;


namespace wpfcore
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }


        private void ScrollViewer_ScrollChanged(object sender, System.Windows.Controls.ScrollChangedEventArgs e)
        {
            menuTranslate.SetValue(TranslateTransform.YProperty, e.VerticalOffset);
            if (e.VerticalOffset > banner.ActualHeight)
            {
                menuTranslate.SetValue(TranslateTransform.YProperty, e.VerticalOffset-banner.ActualHeight);
            }
            else
            {
                menuTranslate.SetValue(TranslateTransform.YProperty, 0.0);
            }
        }
    }
}

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