MainWindow.xaml.cs

using System;
using System.IO;
using System.Runtime.InteropServices;
using FastTransfer.Services;
using FastTransfer.Views;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;

namespace FastTransfer;

public sealed partial class MainWindow : Window
{
    private const int WM_SETICON = 0x0080;
    private const int ICON_BIG = 1;
    private const int ICON_SMALL = 0;
    private const uint IMAGE_ICON = 1;
    private const uint LR_LOADFROMFILE = 0x00000010;
    private const uint LR_DEFAULTSIZE = 0x00000040;

    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    private static extern IntPtr LoadImage(IntPtr hinst, string lpszName, uint type, int cx, int cy, uint fuLoad);
    [DllImport("user32.dll")]
    private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam);

    public MainWindow()
    {
        InitializeComponent();
        SystemBackdrop = new Microsoft.UI.Xaml.Media.MicaBackdrop();
        RootGrid.RequestedTheme = App.MapTheme(AppSettings.Current);

        try
        {
            var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(this);
            var windowId = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(hwnd);
            var appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(windowId);
            appWindow.Resize(new Windows.Graphics.SizeInt32(1280, 820));
            ApplyAppIcon(hwnd);
        }
        catch (Exception ex) { AppLog.Warn("MainWindow", ex.Message); }

        // 首页
        ContentFrame.Navigate(typeof(HomePage));
    }

    /// <summary>把 FastTransfer 图标应用于标题栏 / 任务栏窗口图标（自包含部署从输出目录加载；失败静默）。</summary>
    private static void ApplyAppIcon(IntPtr hwnd)
    {
        try
        {
            var iconPath = Path.Combine(AppContext.BaseDirectory, "Assets", "App.ico");
            if (!File.Exists(iconPath)) return;
            IntPtr hIcon = LoadImage(IntPtr.Zero, iconPath, IMAGE_ICON, 0, 0, LR_LOADFROMFILE | LR_DEFAULTSIZE);
            if (hIcon == IntPtr.Zero) return;
            SendMessage(hwnd, WM_SETICON, (IntPtr)ICON_BIG, hIcon);
            SendMessage(hwnd, WM_SETICON, (IntPtr)ICON_SMALL, hIcon);
        }
        catch (Exception ex) { AppLog.Warn("MainWindow", $"设置窗口图标失败: {ex.Message}"); }
    }

    /// <summary>供各页调用切换到指定导航标签页（§2.3 全面打通：文件管理→工作流等）。</summary>
    public void NavTo(string tag)
    {
        Type page = tag.ToLowerInvariant() switch
        {
            "home" => typeof(HomePage),
            "transfer" => typeof(TransferPage),
            "filemanager" => typeof(FileManagerPage),
            "globalsearch" => typeof(GlobalSearchPage),
            "rename" => typeof(RenameToolPage),
            "workflow" => typeof(WorkflowPage),
            "devices" => typeof(DevicesPage),
            "settings" => typeof(SettingsPage),
            "logs" => typeof(LogsPage),
            _ => typeof(HomePage)
        };
        if (ContentFrame.CurrentSourcePageType != page)
            ContentFrame.Navigate(page, null, infoOverride: new Microsoft.UI.Xaml.Media.Animation.EntranceNavigationTransitionInfo());
    }

    private void OnNavSelectionChanged(NavigationView sender, NavigationViewSelectionChangedEventArgs args)
    {
        if (args.SelectedItemContainer?.Tag is not string tag) return;
        try
        {
            Type page = tag switch
            {
                "home" => typeof(HomePage),
                "transfer" => typeof(TransferPage),
                "filemanager" => typeof(FileManagerPage),
                "globalsearch" => typeof(GlobalSearchPage),
                "rename" => typeof(RenameToolPage),
                "workflow" => typeof(WorkflowPage),
                "devices" => typeof(DevicesPage),
                "settings" => typeof(SettingsPage),
                "logs" => typeof(LogsPage),
                _ => typeof(HomePage)
            };
            if (ContentFrame.CurrentSourcePageType != page)
                ContentFrame.Navigate(page, null, infoOverride: new Microsoft.UI.Xaml.Media.Animation.EntranceNavigationTransitionInfo());
        }
        catch (Exception ex)
        {
            AppLog.Error("MainWindow", ex, $"导航到 {tag} 失败");
        }
    }
}