community/Ink Canvas/MainWindow_cs/MW_SelectionGestures.cs

using iNKORE.UI.WPF.Modern.Controls;
using System;
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Windows.Threading;
using Point = System.Windows.Point;

namespace Ink_Canvas
{
    public partial class MainWindow : Window
    {
        #region Floating Control

        private object lastBorderMouseDownObject;

        private void Border_MouseDown(object sender, MouseButtonEventArgs e)
        {
            // 如果发送者是 RandomDrawPanel 或 SingleDrawPanel，且它们被隐藏，则不处理事件
            if (sender is SimpleStackPanel panel)
            {
                if ((panel == RandomDrawPanel || panel == SingleDrawPanel) &&
                    panel.Visibility != Visibility.Visible)
                {
                    return;
                }
            }

            lastBorderMouseDownObject = sender;
        }

        private bool isStrokeSelectionCloneOn;

        private void BorderStrokeSelectionClone_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;

            if (isStrokeSelectionCloneOn)
            {
                BorderStrokeSelectionClone.Background = Brushes.Transparent;

                isStrokeSelectionCloneOn = false;
            }
            else
            {
                BorderStrokeSelectionClone.Background = new SolidColorBrush(StringToColor("#FF1ED760"));

                isStrokeSelectionCloneOn = true;
            }
        }

        private void BorderStrokeSelectionCloneToNewBoard_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;

            var strokes = inkCanvas.GetSelectedStrokes();
            inkCanvas.Select(new StrokeCollection());
            strokes = strokes.Clone();
            BtnWhiteBoardAdd_Click(null, null);
            inkCanvas.Strokes.Add(strokes);
        }

        private void BorderStrokeSelectionDelete_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;
            SymbolIconDelete_MouseUp(sender, e);
        }

        private void GridPenWidthDecrease_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;
            ChangeStrokeThickness(0.8);
        }

        private void GridPenWidthIncrease_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;
            ChangeStrokeThickness(1.25);
        }

        private void ChangeStrokeThickness(double multipler)
        {
            foreach (var stroke in inkCanvas.GetSelectedStrokes())
            {
                var newWidth = stroke.DrawingAttributes.Width * multipler;
                var newHeight = stroke.DrawingAttributes.Height * multipler;
                if (!(newWidth >= DrawingAttributes.MinWidth) || !(newWidth <= DrawingAttributes.MaxWidth)
                                                              || !(newHeight >= DrawingAttributes.MinHeight) ||
                                                              !(newHeight <= DrawingAttributes.MaxHeight)) continue;
                stroke.DrawingAttributes.Width = newWidth;
                stroke.DrawingAttributes.Height = newHeight;
            }

            if (DrawingAttributesHistory.Count > 0)
            {

                timeMachine.CommitStrokeDrawingAttributesHistory(DrawingAttributesHistory);
                DrawingAttributesHistory = new Dictionary<Stroke, Tuple<DrawingAttributes, DrawingAttributes>>();
                foreach (var item in DrawingAttributesHistoryFlag)
                {
                    item.Value.Clear();
                }
            }
        }

        private void GridPenWidthRestore_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;

            foreach (var stroke in inkCanvas.GetSelectedStrokes())
            {
                stroke.DrawingAttributes.Width = inkCanvas.DefaultDrawingAttributes.Width;
                stroke.DrawingAttributes.Height = inkCanvas.DefaultDrawingAttributes.Height;
            }
        }

        private void ImageFlipHorizontal_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;

            var m = new Matrix();

            // Find center of element and then transform to get current location of center
            var fe = e.Source as FrameworkElement;
            var center = new Point(fe.ActualWidth / 2, fe.ActualHeight / 2);
            center = new Point(inkCanvas.GetSelectionBounds().Left + inkCanvas.GetSelectionBounds().Width / 2,
                inkCanvas.GetSelectionBounds().Top + inkCanvas.GetSelectionBounds().Height / 2);
            center = m.Transform(center); // 转换为矩阵缩放和旋转的中心点

            // Update matrix to reflect translation/rotation
            m.ScaleAt(-1, 1, center.X, center.Y); // 缩放

            var targetStrokes = inkCanvas.GetSelectedStrokes();
            foreach (var stroke in targetStrokes) stroke.Transform(m, false);

            if (DrawingAttributesHistory.Count > 0)
            {
                //var collecion = new StrokeCollection();
                //foreach (var item in DrawingAttributesHistory)
                //{
                //    collecion.Add(item.Key);
                //}
                timeMachine.CommitStrokeDrawingAttributesHistory(DrawingAttributesHistory);
                DrawingAttributesHistory = new Dictionary<Stroke, Tuple<DrawingAttributes, DrawingAttributes>>();
                foreach (var item in DrawingAttributesHistoryFlag)
                {
                    item.Value.Clear();
                }
            }

            //updateBorderStrokeSelectionControlLocation();
        }

        private void ImageFlipVertical_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;

            var m = new Matrix();

            // Find center of element and then transform to get current location of center
            var fe = e.Source as FrameworkElement;
            var center = new Point(fe.ActualWidth / 2, fe.ActualHeight / 2);
            center = new Point(inkCanvas.GetSelectionBounds().Left + inkCanvas.GetSelectionBounds().Width / 2,
                inkCanvas.GetSelectionBounds().Top + inkCanvas.GetSelectionBounds().Height / 2);
            center = m.Transform(center); // 转换为矩阵缩放和旋转的中心点

            // Update matrix to reflect translation/rotation
            m.ScaleAt(1, -1, center.X, center.Y); // 缩放

            var targetStrokes = inkCanvas.GetSelectedStrokes();
            foreach (var stroke in targetStrokes) stroke.Transform(m, false);

            if (DrawingAttributesHistory.Count > 0)
            {
                timeMachine.CommitStrokeDrawingAttributesHistory(DrawingAttributesHistory);
                DrawingAttributesHistory = new Dictionary<Stroke, Tuple<DrawingAttributes, DrawingAttributes>>();
                foreach (var item in DrawingAttributesHistoryFlag)
                {
                    item.Value.Clear();
                }
            }
        }

        // ... existing code ...
        private void ImageRotate45_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;

            var m = new Matrix();

            // Find center of element and then transform to get current location of center
            var fe = e.Source as FrameworkElement;
            var center = new Point(fe.ActualWidth / 2, fe.ActualHeight / 2);
            center = new Point(inkCanvas.GetSelectionBounds().Left + inkCanvas.GetSelectionBounds().Width / 2,
                inkCanvas.GetSelectionBounds().Top + inkCanvas.GetSelectionBounds().Height / 2);
            center = m.Transform(center); // 转换为矩阵缩放和旋转的中心点

            // Update matrix to reflect translation/rotation
            m.RotateAt(45, center.X, center.Y); // 顺时针旋转45度

            var targetStrokes = inkCanvas.GetSelectedStrokes();
            foreach (var stroke in targetStrokes) stroke.Transform(m, false);

            if (DrawingAttributesHistory.Count > 0)
            {
                timeMachine.CommitStrokeDrawingAttributesHistory(DrawingAttributesHistory);
                DrawingAttributesHistory = new Dictionary<Stroke, Tuple<DrawingAttributes, DrawingAttributes>>();
                foreach (var item in DrawingAttributesHistoryFlag)
                {
                    item.Value.Clear();
                }
            }
        }

        private void ImageRotate90_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (lastBorderMouseDownObject != sender) return;

            var m = new Matrix();

            // Find center of element and then transform to get current location of center
            var fe = e.Source as FrameworkElement;
            var center = new Point(fe.ActualWidth / 2, fe.ActualHeight / 2);
            center = new Point(inkCanvas.GetSelectionBounds().Left + inkCanvas.GetSelectionBounds().Width / 2,
                inkCanvas.GetSelectionBounds().Top + inkCanvas.GetSelectionBounds().Height / 2);
            center = m.Transform(center); // 转换为矩阵缩放和旋转的中心点

            // Update matrix to reflect translation/rotation
            m.RotateAt(90, center.X, center.Y); // 旋转

            var targetStrokes = inkCanvas.GetSelectedStrokes();
            foreach (var stroke in targetStrokes) stroke.Transform(m, false);

            if (DrawingAttributesHistory.Count > 0)
            {
                var collecion = new StrokeCollection();
                foreach (var item in DrawingAttributesHistory)
                {
                    collecion.Add(item.Key);
                }

                timeMachine.CommitStrokeDrawingAttributesHistory(DrawingAttributesHistory);
                DrawingAttributesHistory = new Dictionary<Stroke, Tuple<DrawingAttributes, DrawingAttributes>>();
                foreach (var item in DrawingAttributesHistoryFlag)
                {
                    item.Value.Clear();
                }
            }
        }

        #endregion

        private bool isGridInkCanvasSelectionCoverMouseDown;
        private StrokeCollection StrokesSelectionClone = new StrokeCollection();

        private void GridInkCanvasSelectionCover_MouseDown(object sender, MouseButtonEventArgs e)
        {
            isGridInkCanvasSelectionCoverMouseDown = true;
        }

        private void GridInkCanvasSelectionCover_MouseUp(object sender, MouseButtonEventArgs e)
        {
            if (!isGridInkCanvasSelectionCoverMouseDown) return;
            isGridInkCanvasSelectionCoverMouseDown = false;
            GridInkCanvasSelectionCover.Visibility = Visibility.Collapsed;
        }

        private void BtnSelect_Click(object sender, RoutedEventArgs e)
        {
            ExitMultiTouchModeIfNeeded();
            forceEraser = true;
            drawingShapeMode = 0;
            inkCanvas.IsManipulationEnabled = false;
            if (inkCanvas.EditingMode == InkCanvasEditingMode.Select)
            {
                if (inkCanvas.GetSelectedStrokes().Count == inkCanvas.Strokes.Count)
                {
                    // 使用集中化的工具模式切换方法
                    SetCurrentToolMode(InkCanvasEditingMode.Ink,
                        () => { SetCurrentToolMode(InkCanvasEditingMode.Select); });
                }
                else
                {
                    var selectedStrokes = new StrokeCollection();
                    foreach (var stroke in inkCanvas.Strokes)
                        if (stroke.GetBounds().Width > 0 && stroke.GetBounds().Height > 0)
                            selectedStrokes.Add(stroke);
                    inkCanvas.Select(selectedStrokes);
                }
            }
            else
            {
                // 使用集中化的工具模式切换方法
                SetCurrentToolMode(InkCanvasEditingMode.Select);
            }
        }

        private double BorderStrokeSelectionControlWidth = 490.0;
        private double BorderStrokeSelectionControlHeight = 80.0;
        private bool isProgramChangeStrokeSelection;

        private void inkCanvas_SelectionChanged(object sender, EventArgs e)
        {
            if (isProgramChangeStrokeSelection) return;
            if (inkCanvas.GetSelectedStrokes().Count == 0)
            {
                GridInkCanvasSelectionCover.Visibility = Visibility.Collapsed;

            }
            else
            {
                GridInkCanvasSelectionCover.Visibility = Visibility.Visible;
                BorderStrokeSelectionClone.Background = Brushes.Transparent;
                isStrokeSelectionCloneOn = false;
                updateBorderStrokeSelectionControlLocation();

            }
        }



        private void updateBorderStrokeSelectionControlLocation()
        {
            var borderLeft = (inkCanvas.GetSelectionBounds().Left + inkCanvas.GetSelectionBounds().Right -
                              BorderStrokeSelectionControlWidth) / 2;
            var borderTop = inkCanvas.GetSelectionBounds().Bottom + 1;
            if (borderLeft < 0) borderLeft = 0;
            if (borderTop < 0) borderTop = 0;
            if (Width - borderLeft < BorderStrokeSelectionControlWidth || double.IsNaN(borderLeft))
                borderLeft = Width - BorderStrokeSelectionControlWidth;
            if (Height - borderTop < BorderStrokeSelectionControlHeight || double.IsNaN(borderTop))
                borderTop = Height - BorderStrokeSelectionControlHeight;

            if (borderTop > 60) borderTop -= 60;
            BorderStrokeSelectionControl.Margin = new Thickness(borderLeft, borderTop, 0, 0);
        }

        private void GridInkCanvasSelectionCover_ManipulationStarting(object sender, ManipulationStartingEventArgs e)
        {
            e.Mode = ManipulationModes.All;
        }

        private void GridInkCanvasSelectionCover_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
        {
            if (StrokeManipulationHistory?.Count > 0)
            {
                timeMachine.CommitStrokeManipulationHistory(StrokeManipulationHistory);
                foreach (var item in StrokeManipulationHistory)
                {
                    StrokeInitialHistory[item.Key] = item.Value.Item2;
                }

                StrokeManipulationHistory = null;
            }

            if (DrawingAttributesHistory.Count > 0)
            {
                timeMachine.CommitStrokeDrawingAttributesHistory(DrawingAttributesHistory);
                DrawingAttributesHistory = new Dictionary<Stroke, Tuple<DrawingAttributes, DrawingAttributes>>();
                foreach (var item in DrawingAttributesHistoryFlag)
                {
                    item.Value.Clear();
                }
            }
        }

        private void GridInkCanvasSelectionCover_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
        {
            try
            {
                if (dec.Count >= 1)
                {
                    bool disableScale = dec.Count >= 3;
                    var md = e.DeltaManipulation;
                    var trans = md.Translation; // 获得位移矢量
                    var rotate = md.Rotation; // 获得旋转角度
                    var scale = md.Scale; // 获得缩放倍数

                    var m = new Matrix();

                    // Find center of element and then transform to get current location of center
                    var fe = e.Source as FrameworkElement;
                    var center = new Point(fe.ActualWidth / 2, fe.ActualHeight / 2);
                    center = new Point(inkCanvas.GetSelectionBounds().Left + inkCanvas.GetSelectionBounds().Width / 2,
                        inkCanvas.GetSelectionBounds().Top + inkCanvas.GetSelectionBounds().Height / 2);
                    center = m.Transform(center); // 转换为矩阵缩放和旋转的中心点

                    // Update matrix to reflect translation/rotation
                    m.Translate(trans.X, trans.Y); // 移动
                    if (!disableScale)
                        m.ScaleAt(scale.X, scale.Y, center.X, center.Y); // 缩放

                    var strokes = inkCanvas.GetSelectedStrokes();
                    if (StrokesSelectionClone.Count != 0)
                        strokes = StrokesSelectionClone;
                    else if (Settings.Gesture.IsEnableTwoFingerRotationOnSelection)
                        m.RotateAt(rotate, center.X, center.Y); // 旋转
                    foreach (var stroke in strokes)
                    {
                        stroke.Transform(m, false);

                        try
                        {
                            stroke.DrawingAttributes.Width *= md.Scale.X;
                            stroke.DrawingAttributes.Height *= md.Scale.Y;
                        }
                        catch
                        {
                        }
                    }

                    updateBorderStrokeSelectionControlLocation();
                }
            }
            catch
            {
            }
        }

        private void GridInkCanvasSelectionCover_TouchDown(object sender, TouchEventArgs e)
        {
        }

        private void GridInkCanvasSelectionCover_TouchUp(object sender, TouchEventArgs e)
        {
        }

        private Point lastTouchPointOnGridInkCanvasCover = new Point(0, 0);

        private void GridInkCanvasSelectionCover_PreviewTouchDown(object sender, TouchEventArgs e)
        {
            dec.Add(e.TouchDevice.Id);
            //设备1个的时候，记录中心点
            if (dec.Count == 1)
            {
                var touchPoint = e.GetTouchPoint(null);
                centerPoint = touchPoint.Position;
                lastTouchPointOnGridInkCanvasCover = touchPoint.Position;

                if (isStrokeSelectionCloneOn)
                {
                    var strokes = inkCanvas.GetSelectedStrokes();
                    isProgramChangeStrokeSelection = true;
                    inkCanvas.Select(new StrokeCollection());
                    StrokesSelectionClone = strokes.Clone();
                    inkCanvas.Select(strokes);
                    isProgramChangeStrokeSelection = false;
                    inkCanvas.Strokes.Add(StrokesSelectionClone);
                }
                else
                {
                    // 新增：启动套索选择模式
                    // 使用集中化的工具模式切换方法
                    SetCurrentToolMode(InkCanvasEditingMode.Select);
                    inkCanvas.Select(new StrokeCollection());
                }
            }
        }

        private void GridInkCanvasSelectionCover_PreviewTouchUp(object sender, TouchEventArgs e)
        {
            dec.Remove(e.TouchDevice.Id);
            if (dec.Count >= 1) return;
            isProgramChangeStrokeSelection = false;
            if (lastTouchPointOnGridInkCanvasCover == e.GetTouchPoint(null).Position)
            {
                if (!(lastTouchPointOnGridInkCanvasCover.X < inkCanvas.GetSelectionBounds().Left) &&
                    !(lastTouchPointOnGridInkCanvasCover.Y < inkCanvas.GetSelectionBounds().Top) &&
                    !(lastTouchPointOnGridInkCanvasCover.X > inkCanvas.GetSelectionBounds().Right) &&
                    !(lastTouchPointOnGridInkCanvasCover.Y > inkCanvas.GetSelectionBounds().Bottom)) return;
                inkCanvas.Select(new StrokeCollection());
                StrokesSelectionClone = new StrokeCollection();
            }
            else if (inkCanvas.GetSelectedStrokes().Count == 0)
            {
                GridInkCanvasSelectionCover.Visibility = Visibility.Collapsed;
                StrokesSelectionClone = new StrokeCollection();
            }
            else
            {
                GridInkCanvasSelectionCover.Visibility = Visibility.Visible;
                StrokesSelectionClone = new StrokeCollection();
            }
        }

        private void LassoSelect_Click(object sender, RoutedEventArgs e)
        {
            ExitMultiTouchModeIfNeeded();
            forceEraser = false;
            forcePointEraser = false;
            drawingShapeMode = 0;
            // 使用集中化的工具模式切换方法
            SetCurrentToolMode(InkCanvasEditingMode.Select);
            SetCursorBasedOnEditingMode(inkCanvas);
        }

        private void BtnLassoSelect_Click(object sender, RoutedEventArgs e)
        {
            ExitMultiTouchModeIfNeeded();
            forceEraser = false;
            forcePointEraser = false;
            drawingShapeMode = 0;
            // 使用集中化的工具模式切换方法
            SetCurrentToolMode(InkCanvasEditingMode.Select);
            inkCanvas.IsManipulationEnabled = true;
            SetCursorBasedOnEditingMode(inkCanvas);
        }

        #region UIElement Selection and Resize
        
        private Rect GetUIElementBounds(UIElement element)
        {
            if (element is FrameworkElement fe)
            {
                var left = InkCanvas.GetLeft(element);
                var top = InkCanvas.GetTop(element);

                if (double.IsNaN(left)) left = 0;
                if (double.IsNaN(top)) top = 0;

                var width = fe.ActualWidth > 0 ? fe.ActualWidth : fe.Width;
                var height = fe.ActualHeight > 0 ? fe.ActualHeight : fe.Height;

                // 检查是否有RenderTransform
                if (fe.RenderTransform != null && fe.RenderTransform != Transform.Identity)
                {
                    try
                    {
                        // 如果有变换，使用变换后的边界
                        var transform = element.TransformToAncestor(inkCanvas);
                        var elementBounds = new Rect(0, 0, width, height);
                        var transformedBounds = transform.TransformBounds(elementBounds);
                        return transformedBounds;
                    }
                    catch
                    {
                        // 变换失败时回退到简单计算
                        return new Rect(left, top, width, height);
                    }
                }
                else
                {
                    // 没有变换时直接使用位置和大小
                    return new Rect(left, top, width, height);
                }
            }

            return new Rect(0, 0, 0, 0);
        }
    }
}

#endregion