MAUI非模态固定尺寸可移动弹窗开发及Android适配问题求助

需求特性 #

我需要实现一个具备以下特性的弹窗：

• 非模态（non-modal）
• 不可调整大小
• 不可最大化、不可最小化
• 始终悬浮在主应用窗口上方
• 用户可在屏幕上拖动移动
• 随主应用窗口的移动而同步移动

已尝试方案及不足 #

目前尝试过两种方案，但均无法完全满足需求：

• 使用CommunityToolkit.Maui.Views.PopUp：无法设置为非模态且支持用户拖动
• 使用Microsoft.Maui.Controls.Window：无法设置不可调整大小、不可最大化/最小化，也无法始终悬浮在主窗口上方

当前实现及Android端问题 #

根据提示编写的代码在Windows上运行正常，但在Android模拟器中存在问题：弹窗仅支持左右拖动，无法上下拖动。应用采用纯代码后置开发，相关代码片段如下：

主ContentPage代码 #

public partial class MyApp : ContentPage
{
    // ...
    private static PanContainer panContainer = null;
    private static MyMovablePopUp popUp = null;
    // ...

    public MyApp() : base()
    {
        InitializeComponent();
        
        ScrollView sv = new ScrollView();
        this.Content = sv;
        sv.HorizontalScrollBarVisibility = ScrollBarVisibility.Default;
        sv.VerticalScrollBarVisibility = ScrollBarVisibility.Default;

        Grid baseZStack = new Grid(); // The base stack for the overlay (ZIndex) of the PopUp (+ PanContainer) over the main content page
        sv.Content = baseZStack;

        // the control that contains all elements of the main content page
        VerticalStackLayout vsl = new VerticalStackLayout();
        baseZStack.Children.Add(vsl);
        vsl.ZIndex = 1;
        vsl.Padding = new Thickness(LEFT_RIGHT_MARGIN, 0, LEFT_RIGHT_MARGIN, LEFT_RIGHT_MARGIN);
        vsl.Spacing = 5;
        vsl.VerticalOptions = LayoutOptions.Start;
        vsl.HorizontalOptions = LayoutOptions.Start;

        // the control that contains the MyMovablePopUp
        panContainer = new PanContainer();
        baseZStack.Children.Add(panContainer);
        panContainer.ZIndex = 2;
        popUp = new MyMovablePopUp(this);
        panContainer.IsVisible = false;
        panContainer.Content = popUp;

        // ...  
    }
}

弹窗定义 #

internal class MyMovablePopUp : Border
{
    private readonly MyApp app;
    // ...
    internal MyMovablePopUp(MyApp app) : base()
    {
        this.app = app;
        this.MinimumWidthRequest = 140;
        this.MaximumWidthRequest = this.MinimumWidthRequest;
        this.MinimumHeightRequest = 290;
        this.MaximumHeightRequest = this.MinimumHeightRequest;
        
        // ... add content
    }
}

PanContainer实现 #

public class PanContainer : ContentView
{
    double panX, panY;

    public PanContainer()
    {
        PanGestureRecognizer panGesture = new PanGestureRecognizer();
        panGesture.PanUpdated += OnPanUpdated;
        GestureRecognizers.Add(panGesture);
    }

    void OnPanUpdated(object sender, PanUpdatedEventArgs e)
    {
        switch (e.StatusType)
        {
            case GestureStatus.Running:
                Content.TranslationX = panX + e.TotalX; 
                Content.TranslationY = panY + e.TotalY;
                break;

            case GestureStatus.Completed:
                panX = Content.TranslationX;
                panY = Content.TranslationY;
                break;
        }
    }
}

现寻求解决Android模拟器中弹窗无法上下拖动的问题，或能完全满足需求的其他实现方案。

内容的提问来源于stack exchange，提问作者user7399085