NoteMAUI/ResizableCanvasPage.xaml.cs

using Microsoft.Maui.Controls;
using Microsoft.Maui.Graphics;
using System;

namespace NotesDataAnalyst
{
    public partial class ResizableCanvasPage : ContentPage
    {
        private const double InitialWidth = 150;
        private const double InitialHeight = 100;
        private double startX, startY;

        public ResizableCanvasPage()
        {
            InitializeComponent();
        }

        private void AddResizableObject(double x, double y)
        {
            // Ñîçäàåì îñíîâíîé êîíòåéíåð (Frame) äëÿ îáúåêòà è ðó÷êè
            var resizableFrame = new Frame
            {
                BackgroundColor = Colors.LightBlue,
                BorderColor = Colors.DarkBlue,
                CornerRadius = 8,
                WidthRequest = InitialWidth,
                HeightRequest = InitialHeight,
                Padding = 0,  // Óáèðàåì âíóòðåííèå îòñòóïû
                Content = new Grid() // Èñïîëüçóåì Grid äëÿ äîáàâëåíèÿ ñîäåðæèìîãî è ðó÷êè
            };

            // Ñîçäàåì ñîäåðæèìîå âíóòðè ôðåéìà
            var content = new StackLayout
            {
                BackgroundColor = Colors.LightBlue,
                Children =
                {
                    new Label { Text = "Resizable Object", HorizontalOptions = LayoutOptions.Center, VerticalOptions = LayoutOptions.Center }
                }
            };

            var resizeHandle = new BoxView
            {
                BackgroundColor = Colors.Gray,
                WidthRequest = 20,
                HeightRequest = 20
            };

            // Ñîçäàåì Grid âíóòðè Frame
            var grid = (Grid)resizableFrame.Content;

            // Íàñòðîèì ñåòêó: äîáàâèì äâà ñòîëáöà è äâå ñòðîêè
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Star });
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = GridLength.Auto }); // äëÿ ðó÷êè
            grid.RowDefinitions.Add(new RowDefinition { Height = GridLength.Star });
            grid.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto }); // äëÿ ðó÷êè

            // Äîáàâëÿåì ñîäåðæèìîå â ïåðâóþ ÿ÷åéêó (ñòîëáåö 0, ñòðîêà 0)
            grid.Children.Add(content); // Áåç óêàçàíèÿ êîëîíîê/ñòðîê

            // Äîáàâëÿåì ðó÷êó â ïðàâûé íèæíèé óãîë (ñòîëáåö 1, ñòðîêà 1)
            grid.Children.Add(resizeHandle); // Áåç óêàçàíèÿ êîëîíîê/ñòðîê

            // Óñòàíàâëèâàåì ñòðîêó è êîëîíêó äëÿ ðó÷êè
            Grid.SetRow(resizeHandle, 1);
            Grid.SetColumn(resizeHandle, 1);

            // Äîáàâëÿåì ïàíîðàìó äëÿ ïåðåìåùåíèÿ îáúåêòà
            var panGesture = new PanGestureRecognizer();
            panGesture.PanUpdated += (s, e) => OnDragPanUpdated(s, e, resizableFrame);
            resizableFrame.GestureRecognizers.Add(panGesture);

            // Äîáàâëÿåì ïàíîðàìó äëÿ èçìåíåíèÿ ðàçìåðà
            var resizePanGesture = new PanGestureRecognizer();
            resizePanGesture.PanUpdated += (s, e) => OnResizePanUpdated(s, e, resizableFrame, resizeHandle);
            resizeHandle.GestureRecognizers.Add(resizePanGesture);

            // Óñòàíàâëèâàåì ïîçèöèþ ôðåéìà
            AbsoluteLayout.SetLayoutBounds(resizableFrame, new Rect(x, y, InitialWidth, InitialHeight));
            CanvasLayout.Children.Add(resizableFrame);

            // Îáíîâëÿåì ïîçèöèþ ðó÷êè
            UpdateResizeHandlePosition(resizableFrame, resizeHandle);
        }

        private void OnDragPanUpdated(object sender, PanUpdatedEventArgs e, Frame frame)
        {
            if (e.StatusType == GestureStatus.Started)
            {
                startX = AbsoluteLayout.GetLayoutBounds(frame).X;
                startY = AbsoluteLayout.GetLayoutBounds(frame).Y;
            }
            else if (e.StatusType == GestureStatus.Running)
            {
                double x = startX + e.TotalX;
                double y = startY + e.TotalY;
                AbsoluteLayout.SetLayoutBounds(frame, new Rect(x, y, frame.WidthRequest, frame.HeightRequest));

                // Îáíîâëÿåì ïîçèöèþ ðó÷êè
                var resizeHandle = (BoxView)((Grid)frame.Content).Children[1];
                UpdateResizeHandlePosition(frame, resizeHandle);
            }
        }

        private void OnResizePanUpdated(object sender, PanUpdatedEventArgs e, Frame frame, BoxView resizeHandle)
        {
            if (e.StatusType == GestureStatus.Started)
            {
                startX = frame.WidthRequest;
                startY = frame.HeightRequest;
            }
            else if (e.StatusType == GestureStatus.Running)
            {
                double newWidth = Math.Max(50, startX + e.TotalX);
                double newHeight = Math.Max(50, startY + e.TotalY);
                frame.WidthRequest = newWidth;
                frame.HeightRequest = newHeight;

                // Îáíîâëÿåì ïîçèöèþ ðó÷êè ïîñëå èçìåíåíèÿ ðàçìåðîâ
                UpdateResizeHandlePosition(frame, resizeHandle);
            }
        }

        private void UpdateResizeHandlePosition(Frame frame, BoxView resizeHandle)
        {
            var frameBounds = AbsoluteLayout.GetLayoutBounds(frame);
            double x = frameBounds.X + frame.WidthRequest - resizeHandle.WidthRequest;
            double y = frameBounds.Y + frame.HeightRequest - resizeHandle.HeightRequest;

            AbsoluteLayout.SetLayoutBounds(resizeHandle, new Rect(x, y, resizeHandle.WidthRequest, resizeHandle.HeightRequest));
        }

        protected override void OnAppearing()
        {
            base.OnAppearing();
            AddResizableObject(100, 100);
            AddResizableObject(400, 200);
            AddResizableObject(700, 400);
        }
    }
}