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C# WPF可拖拽的TabControl

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本文背景
代碼實作
本文參考
原始碼

1. 本文背景

本文介紹使用第三方開源庫 Dragablz 實作可拖拽的 TabControl，本文代碼效果圖如下：

2. 代碼實作

使用 .Net Framework 4.8 創建名為 “TabMenu2” 的WPF模板專案，添加三個Nuget庫：MaterialDesignThemes、MaterialDesignColors 和 Dragablz，其中 TabControl 的拖拽功能是由 Dragablz 庫實作的，

以下為三個庫具體版本：

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Dragablz" version="0.0.3.203" targetFramework="net45" />
  <package id="MaterialDesignColors" version="1.2.3-ci948" targetFramework="net48" />
  <package id="MaterialDesignThemes" version="3.1.0-ci948" targetFramework="net48" />
</packages>

解決方案主要檔案目錄組織結構：

TabMenu2
- App.xaml
- MainWindow.xaml
  - MainWIndow.xaml.cs

注：站長嘗試使用 .NET CORE 3.1 創建WPF專案，但 Dragablz 庫暫時未提供 .NET CORE 的版本，想著自己編譯 Dragablz 的 .NET CORE 版本，奈何功力不夠，改了一些原始碼，最后放棄了，文中代碼及文末給出的 Demo 運行程式需要在 .NET Framework 4.0 運行時環境下運行，想嘗試編譯 Dragablz 庫的朋友可在文末給出的鏈接中下載編譯，

2.1 引入樣式

檔案【App.xaml】，在 StartupUri 中設定啟動的視圖【MainWindow.xaml】，并在【Application.Resources】節點增加 MaterialDesignThemes 和 Dragablz 庫的樣式檔案：

<Application x:Class="TabMenu2.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:dragablz="clr-namespace:Dragablz;assembly=Dragablz"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <!-- primary color -->
                <ResourceDictionary>
                    <!-- include your primary palette -->
                    <ResourceDictionary.MergedDictionaries>
                        <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/MaterialDesignColor.purple.xaml" />
                    </ResourceDictionary.MergedDictionaries>

                    <!--
                            include three hues from the primary palette (and the associated forecolours).
                            Do not rename, keep in sequence; light to dark.
                        -->
                    <SolidColorBrush x:Key="PrimaryHueLightBrush" Color="{StaticResource Primary100}"/>
                    <SolidColorBrush x:Key="PrimaryHueLightForegroundBrush" Color="{StaticResource Primary100Foreground}"/>
                    <SolidColorBrush x:Key="PrimaryHueMidBrush" Color="{StaticResource Primary500}"/>
                    <SolidColorBrush x:Key="PrimaryHueMidForegroundBrush" Color="{StaticResource Primary500Foreground}"/>
                    <SolidColorBrush x:Key="PrimaryHueDarkBrush" Color="{StaticResource Primary700}"/>
                    <SolidColorBrush x:Key="PrimaryHueDarkForegroundBrush" Color="{StaticResource Primary700Foreground}"/>
                </ResourceDictionary>

                <!-- secondary colour -->
                <ResourceDictionary>
                    <!-- include your secondary pallette -->
                    <ResourceDictionary.MergedDictionaries>
                        <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/MaterialDesignColor.purple.xaml" />
                    </ResourceDictionary.MergedDictionaries>

                    <!-- include a single secondary accent color (and the associated forecolour) -->
                    <SolidColorBrush x:Key="SecondaryAccentBrush" Color="{StaticResource Accent200}"/>
                    <SolidColorBrush x:Key="SecondaryAccentForegroundBrush" Color="{StaticResource Accent200Foreground}"/>
                </ResourceDictionary>

                <!-- Include the Dragablz Material Design style -->
                <ResourceDictionary Source="pack://application:,,,/Dragablz;component/Themes/materialdesign.xaml"/>
                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
            </ResourceDictionary.MergedDictionaries>

            <!-- tell Dragablz tab control to use the Material Design theme -->
            <Style TargetType="{x:Type dragablz:TabablzControl}" BasedOn="{StaticResource MaterialDesignTabablzControlStyle}" />
        </ResourceDictionary>
    </Application.Resources>
</Application>

2.2 演示表單布局

檔案【MainWindow.xaml】，引入 MaterialDesignThemes 和 Dragablz 庫的命名空間，【dragablz:TabablzControl】為 Dragablz 庫封裝的 TabControl，使用方式和原生控制元件類似，單項標簽依然使用 TabItem，使用起來很簡單，原始碼如下：

<Window x:Class="TabMenu2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:dragablz="clr-namespace:Dragablz;assembly=Dragablz"
        mc:Ignorable="d"
        Height="600" Width="1080" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" 
        MouseLeftButtonDown="Window_MouseLeftButtonDown" WindowStyle="None">
    <Grid>
        <Grid Height="60" VerticalAlignment="Top" Background="#FF9C27B0">
            <TextBlock Text="Dotnet9.com：可拖拽TabControl" Foreground="White" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="22" FontFamily="Champagne &amp; Limousines" />
            <Button HorizontalAlignment="Right" VerticalAlignment="Center" Background="{x:Null}" BorderBrush="{x:Null}" Click="Close_Click">
                <materialDesign:PackIcon Kind="Close"/>
            </Button>
        </Grid>
        <Grid Margin="0 60 0 0">
            <dragablz:TabablzControl>
                <dragablz:TabablzControl.InterTabController>
                    <dragablz:InterTabController/>
                </dragablz:TabablzControl.InterTabController>
                <TabItem Header="首頁">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="50"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <TextBlock FontSize="30" HorizontalAlignment="Center" VerticalAlignment="Center">
                            <Run Text="歡迎訪問Dotnet9的博客："/>
                            <Hyperlink Click="ShowWeb_Click" Tag="https://dotnet9.com">https://dotnet9.com</Hyperlink>
                        </TextBlock>
                        <WebBrowser Grid.Row="1" Margin="5" Source="https://dotnet9.com"/>
                    </Grid>
                </TabItem>
                <TabItem Header="設計">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="50"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <TextBlock Text="為用戶體驗服務！" FontSize="30" HorizontalAlignment="Center" VerticalAlignment="Center"/>
                        <WebBrowser Grid.Row="1" Margin="5" Source="https://dotnet9.com"/>
                    </Grid>
                </TabItem>
                <TabItem Header="幫助">
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="50"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <TextBlock FontSize="30" HorizontalAlignment="Center" VerticalAlignment="Center">
                            <Run Text="問答社區："/>
                            <Hyperlink Click="ShowWeb_Click" Tag="https://dotnet9.com/questions-and-answers">https://dotnet9.com/questions-and-answers</Hyperlink>
                        </TextBlock>
                        <WebBrowser Grid.Row="1" Margin="5" Source="https://dotnet9.com/questions-and-answers"/>
                    </Grid>
                </TabItem>
                <TabItem>
                    <TabItem.Header>
                        <Image Source="https://img.dotnet9.com/logo.png"/>
                    </TabItem.Header>
                    <Grid>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="50"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30">
                            <Hyperlink Click="ShowWeb_Click" Tag="https://dotnet9.com">https://dotnet9.com</Hyperlink>
                        </TextBlock>
                        <WebBrowser Grid.Row="1" Margin="5" Source="https://dotnet9.com"/>
                    </Grid>
                </TabItem>
            </dragablz:TabablzControl>
        </Grid>
    </Grid>
</Window>

后臺代碼【MainWindow.xaml.cs】實作滑鼠左鍵拖動表單、右上角關閉表單、超鏈接打開網站等功能：

private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    DragMove();
}

private void Close_Click(object sender, RoutedEventArgs e)
{
    this.Close();
}

private void ShowWeb_Click(object sender, RoutedEventArgs e)
{
    Process.Start((sender as Hyperlink).Tag.ToString());
}