update

App.xaml

@@ -2,8 +2,16 @@
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:local="clr-namespace:VideoConcat"
+             xmlns:wd="https://github.com/WPFDevelopersOrg/WPFDevelopers"
              StartupUri="MainWindow.xaml">
     <Application.Resources>
-         
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="pack://application:,,,/WPFDevelopers;component/Themes/Light.Blue.xaml"/>
+                <!--需要注意 wd:Resources 必须在配色主题后，Theme="Dark" 为黑色皮肤-->
+                <wd:Resources Theme="Light"/>
+                <ResourceDictionary Source="pack://application:,,,/WPFDevelopers;component/Themes/Theme.xaml"/>
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
     </Application.Resources>
 </Application>

MainWindow.xaml

@@ -6,9 +6,9 @@
         xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
         xmlns:local="clr-namespace:VideoConcat"
         mc:Ignorable="d"
-        Title="登录" Height="450" Width="800"
+        Title="登录" Height="300" Width="500"
         ResizeMode="NoResize" WindowStartupLocation="CenterScreen"
-        WindowStyle="None">
+      >
     <Window.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
@@ -20,63 +20,46 @@
             </ResourceDictionary.MergedDictionaries>
         </ResourceDictionary>
     </Window.Resources>
-    <Grid MouseDown="Grid_MouseDown">
+    <Grid >
-        <Grid.Background>
+        <Border>
-            <LinearGradientBrush StartPoint="0.1,0" EndPoint="0.9,1">
-                <GradientStop Offset="1" Color="#FFE63070"/>
-                <GradientStop Offset="0" Color="#FFFE8704"/>
-            </LinearGradientBrush>
-        </Grid.Background>
-        <Border Height="390" VerticalAlignment="Top" 
-                Background="#220000" CornerRadius="0 0 180 0">
             <StackPanel Orientation="Horizontal" >
-               <StackPanel Width="350">
+                <StackPanel Width="500">
-                  <!--    <Image Width="300" Height="300" Margin="30"  VerticalAlignment="Top" Stretch="Fill" Source="pack://application:,,,/VideoConcat;component/Images/left.png"/>-->
+                    <StackPanel >
-                </StackPanel> 
-                <StackPanel Width="350">
-                    <StackPanel Margin="20,40">
                         <TextBlock Margin="20" FontFamily="Great Vibes"
-                                   FontSize="38" Foreground="White" TextAlignment="Center">
+                                   FontSize="38"  TextAlignment="Center">
                             用户登录
                         </TextBlock>
                         <StackPanel Margin="10" Orientation="Horizontal">
                             <materialDesign:PackIcon
-                                Width="25" Height="25" Foreground="White"
+                                Width="30" Height="30" 
-                                Kind="User"/>
+                                Kind="User" Margin="10,0,10,0"/>
-                            <TextBox x:Name="txtUserName" Width="250"
+                            <TextBox x:Name="txtUserName" Width="400"
                                      Margin="10,0" BorderBrush="White"
-                                     CaretBrush="#FFD94448" Foreground="White"
+                                     CaretBrush="#FFD94448" 
                                      SelectionBrush="#FFD94448"
                                      materialDesign:HintAssist.Hint="输入 用户名"/>
                         </StackPanel>
                         <StackPanel Margin="10" Orientation="Horizontal">
                             <materialDesign:PackIcon
-                                 Width="25" Height="25" Foreground="White"
+                                 Width="30" Height="30"
-                                 Kind="Lock"/>
+                                 Kind="Lock" Margin="10,0,10,0"/>
-                            <PasswordBox x:Name="txtPassword" Width="250"
+                            <PasswordBox x:Name="txtPassword" Width="400"
                                       Margin="10,0" BorderBrush="White"
-                                      CaretBrush="#FFD94448" Foreground="White"
+                                      CaretBrush="#FFD94448" 
                                       SelectionBrush="#FFD94448"
                                       materialDesign:HintAssist.Hint="输入 密码"
                                       />
                         </StackPanel>
-                        <StackPanel Margin="10" HorizontalAlignment="Center">
+                        <StackPanel Margin="10" HorizontalAlignment="Center" VerticalAlignment="Center">
                             <Button  x:Name="btnLogin" Width="100" Height="40"
                                      materialDesign:ButtonAssist.CornerRadius="10"
                                      Background="#D94448" BorderBrush="#D94448" BorderThickness="2"
-                                     Content="登录" Foreground="White" ToolTip="登录"
+                                     Content="登录" ToolTip="登录"
                                      Style="{StaticResource MaterialDesignRaisedButton}" Click="BtnLogin_Click"/>
                         </StackPanel>
                     </StackPanel>
                 </StackPanel>
-                <StackPanel Width="100">
+               
-                    <Button x:Name="btnExit" Margin="5,10" Background="{x:Null}"
-                            Click="BtnExit_Click" Style="{StaticResource MaterialDesignFloatingActionButton}"
-                            ToolTip="关闭" Height="36" Width="36">
-                        <materialDesign:PackIcon Width="20" Height="20" 
-                                                 Foreground="White" Kind="Close"/>
-                    </Button>
-                </StackPanel>
             </StackPanel>
 
         </Border>

MainWindow.xaml.cs

@@ -27,10 +27,12 @@ namespace VideoConcat
         }
 
         private void BtnLogin_Click(object sender, RoutedEventArgs e)
-        {
+        { Video video = new();
+                video.Show();
             if (txtUserName.Text == "admin" && txtPassword.Password == "123456")
             {
-                 MessageBox.Show("登录成功");
+               
+                this.Close();
                 return;
             }
             MessageBox.Show("用户名或者密码错误！");

Task.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace VideoConcat
+{
+    
+        public static class ProcessVideo
+        {
+            public static void RunTask(System.Windows.Controls.ProgressBar progressBar, System.Windows.Controls.Button btn)
+            {
+                for (int i = 0; i <= 100; i++)
+                {
+                    Application.Current.Dispatcher.Invoke(() =>
+                    {
+                        progressBar.Dispatcher.Invoke(() =>
+                        {
+                            progressBar.Value = i;
+                        });
+                    });
+                    System.Threading.Thread.Sleep(50);
+                }
+                btn.Dispatcher.Invoke(() =>
+                {
+                    btn.IsEnabled = true;
+                });
+
+            }
+        }
+  
+}

Video.xaml

@@ -0,0 +1,18 @@
+<Window x:Class="VideoConcat.Video"
+        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:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
+        xmlns:local="clr-namespace:VideoConcat"
+        xmlns:wd="https://github.com/WPFDevelopersOrg/WPFDevelopers"
+        mc:Ignorable="d"
+        Title="视频" Height="450" Width="800" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" >
+    <Grid>
+        <StackPanel>
+            <Button Content="开始拼接"  VerticalAlignment="Top" Height="30" Click="Button_Click" x:Name="startButton" Margin="5"/>
+            <TextBlock  Margin="5" TextWrapping="Wrap" Text="" Height="auto" x:Name="outputTxt"/>
+        </StackPanel>
+            <ProgressBar x:Name="processVideoBar" Minimum="0" Maximum="100" Value="0" VerticalAlignment="Bottom" Height="10" Margin="5"/>
+    </Grid>
+</Window>

Video.xaml.cs

@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace VideoConcat
+{
+    /// <summary>
+    /// Video.xaml 的交互逻辑
+    /// </summary>
+    public partial class Video : Window
+    {
+        public Video()
+        {
+            InitializeComponent();
+        }
+
+        private async void Button_Click(object sender, RoutedEventArgs e)
+        {
+            startButton.IsEnabled = false;
+            await Task.Run(() => ProcessVideo.RunTask(processVideoBar, startButton));
+        }
+    }
+}

VideoConcat.csproj

@@ -10,6 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="MaterialDesignXaml.DialogsHelper" Version="1.0.4" />
+    <PackageReference Include="WPFDevelopers" Version="0.0.0.1" />
   </ItemGroup>
 
 </Project>