304 lines
11 KiB
C#
304 lines
11 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Media;
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using System.Windows.Shapes;
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using Brushes = System.Windows.Media.Brushes;
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using Color = System.Windows.Media.Color;
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// 为了避免命名冲突，使用别名
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using WpfCanvas = System.Windows.Controls.Canvas;
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using DrawingRectangle = System.Drawing.Rectangle;
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using WpfRectangle = System.Windows.Shapes.Rectangle;
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namespace Ink_Canvas
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{
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public partial class ScreenshotSelectorWindow : Window
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{
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private bool _isSelecting = false;
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private bool _isFreehandMode = false;
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private System.Windows.Point _startPoint;
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private System.Windows.Point _currentPoint;
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private List<System.Windows.Point> _freehandPoints;
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private Polyline _freehandPolyline;
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public DrawingRectangle? SelectedArea { get; private set; }
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public List<System.Windows.Point> SelectedPath { get; private set; }
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public ScreenshotSelectorWindow()
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{
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InitializeComponent();
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// 设置窗口覆盖所有屏幕
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SetupFullScreenOverlay();
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// 初始化自由绘制模式
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InitializeFreehandMode();
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// 隐藏提示文字的定时器
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var timer = new System.Windows.Threading.DispatcherTimer();
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timer.Interval = TimeSpan.FromSeconds(5);
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timer.Tick += (s, e) =>
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{
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HintText.Visibility = Visibility.Collapsed;
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timer.Stop();
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};
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timer.Start();
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}
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private void InitializeFreehandMode()
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{
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_freehandPoints = new List<System.Windows.Point>();
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_freehandPolyline = new Polyline
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{
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Stroke = Brushes.Red,
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StrokeThickness = 2,
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Fill = Brushes.Transparent
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};
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SelectionCanvas.Children.Add(_freehandPolyline);
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}
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private void SetupFullScreenOverlay()
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{
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// 获取所有屏幕的虚拟屏幕边界
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var virtualScreen = System.Windows.Forms.SystemInformation.VirtualScreen;
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// 转换为WPF坐标系统
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var dpiScale = GetDpiScale();
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this.Left = virtualScreen.Left / dpiScale;
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this.Top = virtualScreen.Top / dpiScale;
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this.Width = virtualScreen.Width / dpiScale;
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this.Height = virtualScreen.Height / dpiScale;
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}
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private double GetDpiScale()
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{
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var source = PresentationSource.FromVisual(this);
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if (source?.CompositionTarget != null)
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{
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return source.CompositionTarget.TransformToDevice.M11;
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}
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return 1.0; // 默认DPI
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}
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private void Window_KeyDown(object sender, KeyEventArgs e)
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{
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if (e.Key == Key.Escape)
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{
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// 取消截图
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SelectedArea = null;
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SelectedPath = null;
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DialogResult = false;
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Close();
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}
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}
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private void RectangleModeButton_Click(object sender, RoutedEventArgs e)
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{
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_isFreehandMode = false;
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RectangleModeButton.Background = new SolidColorBrush(Color.FromRgb(37, 99, 235)); // 蓝色
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FreehandModeButton.Background = new SolidColorBrush(Color.FromRgb(107, 114, 128)); // 灰色
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HintText.Text = "拖拽鼠标选择矩形区域";
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// 清除自由绘制的内容
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_freehandPoints.Clear();
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_freehandPolyline.Points.Clear();
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SelectionPath.Visibility = Visibility.Collapsed;
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SelectionRectangle.Visibility = Visibility.Collapsed;
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}
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private void FreehandModeButton_Click(object sender, RoutedEventArgs e)
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{
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_isFreehandMode = true;
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FreehandModeButton.Background = new SolidColorBrush(Color.FromRgb(37, 99, 235)); // 蓝色
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RectangleModeButton.Background = new SolidColorBrush(Color.FromRgb(107, 114, 128)); // 灰色
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HintText.Text = "按住鼠标左键绘制任意形状，松开完成";
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// 清除矩形选择的内容
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SelectionRectangle.Visibility = Visibility.Collapsed;
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_freehandPoints.Clear();
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_freehandPolyline.Points.Clear();
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}
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private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
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{
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_isSelecting = true;
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_startPoint = e.GetPosition(this);
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_currentPoint = _startPoint;
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// 隐藏提示文字
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HintText.Visibility = Visibility.Collapsed;
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if (_isFreehandMode)
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{
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// 自由绘制模式
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_freehandPoints.Clear();
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_freehandPolyline.Points.Clear();
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_freehandPoints.Add(_startPoint);
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_freehandPolyline.Points.Add(_startPoint);
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}
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else
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{
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// 矩形模式
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SelectionRectangle.Visibility = Visibility.Visible;
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SizeInfoBorder.Visibility = Visibility.Visible;
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}
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// 捕获鼠标
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CaptureMouse();
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if (!_isFreehandMode)
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{
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UpdateSelection();
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}
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}
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private void Window_MouseMove(object sender, MouseEventArgs e)
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{
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if (_isSelecting)
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{
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_currentPoint = e.GetPosition(this);
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if (_isFreehandMode)
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{
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// 自由绘制模式：添加点到路径
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_freehandPoints.Add(_currentPoint);
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_freehandPolyline.Points.Add(_currentPoint);
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}
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else
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{
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// 矩形模式
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UpdateSelection();
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}
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}
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}
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private void Window_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
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{
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if (_isSelecting)
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{
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_isSelecting = false;
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ReleaseMouseCapture();
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if (_isFreehandMode)
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{
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// 自由绘制模式：完成路径
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if (_freehandPoints.Count > 3) // 至少需要3个点形成有效路径
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{
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// 闭合路径
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_freehandPoints.Add(_startPoint);
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_freehandPolyline.Points.Add(_startPoint);
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// 保存选择的路径
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SelectedPath = new List<System.Windows.Point>(_freehandPoints);
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// 计算边界矩形用于截图
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var bounds = CalculatePathBounds(_freehandPoints);
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var dpiScale = GetDpiScale();
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var virtualScreen = System.Windows.Forms.SystemInformation.VirtualScreen;
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int screenX = (int)((bounds.X * dpiScale) + virtualScreen.Left);
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int screenY = (int)((bounds.Y * dpiScale) + virtualScreen.Top);
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int screenWidth = (int)(bounds.Width * dpiScale);
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int screenHeight = (int)(bounds.Height * dpiScale);
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SelectedArea = new DrawingRectangle(screenX, screenY, screenWidth, screenHeight);
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DialogResult = true;
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}
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else
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{
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SelectedArea = null;
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SelectedPath = null;
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DialogResult = false;
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}
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}
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else
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{
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// 矩形模式
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var rect = GetSelectionRectangle();
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if (rect.Width > 5 && rect.Height > 5) // 最小尺寸检查
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{
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// 转换为屏幕坐标，考虑DPI缩放
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var dpiScale = GetDpiScale();
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var virtualScreen = System.Windows.Forms.SystemInformation.VirtualScreen;
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// 计算实际屏幕坐标
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int screenX = (int)((rect.X * dpiScale) + virtualScreen.Left);
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int screenY = (int)((rect.Y * dpiScale) + virtualScreen.Top);
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int screenWidth = (int)(rect.Width * dpiScale);
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int screenHeight = (int)(rect.Height * dpiScale);
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SelectedArea = new DrawingRectangle(screenX, screenY, screenWidth, screenHeight);
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DialogResult = true;
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}
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else
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{
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SelectedArea = null;
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DialogResult = false;
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}
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}
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Close();
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}
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}
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private void UpdateSelection()
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{
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var rect = GetSelectionRectangle();
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// 更新选择矩形
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WpfCanvas.SetLeft(SelectionRectangle, rect.X);
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WpfCanvas.SetTop(SelectionRectangle, rect.Y);
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SelectionRectangle.Width = rect.Width;
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SelectionRectangle.Height = rect.Height;
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// 更新尺寸信息
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SizeInfoText.Text = $"{(int)rect.Width} x {(int)rect.Height}";
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WpfCanvas.SetLeft(SizeInfoBorder, rect.X);
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WpfCanvas.SetTop(SizeInfoBorder, rect.Y - 30);
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// 确保尺寸信息不超出屏幕
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if (WpfCanvas.GetTop(SizeInfoBorder) < 0)
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{
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WpfCanvas.SetTop(SizeInfoBorder, rect.Y + rect.Height + 5);
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}
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}
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private Rect GetSelectionRectangle()
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{
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double x = Math.Min(_startPoint.X, _currentPoint.X);
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double y = Math.Min(_startPoint.Y, _currentPoint.Y);
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double width = Math.Abs(_currentPoint.X - _startPoint.X);
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double height = Math.Abs(_currentPoint.Y - _startPoint.Y);
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return new Rect(x, y, width, height);
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}
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private Rect CalculatePathBounds(List<System.Windows.Point> points)
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{
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if (points == null || points.Count == 0)
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return new Rect();
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double minX = points[0].X;
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double minY = points[0].Y;
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double maxX = points[0].X;
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double maxY = points[0].Y;
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foreach (var point in points)
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{
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minX = Math.Min(minX, point.X);
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minY = Math.Min(minY, point.Y);
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maxX = Math.Max(maxX, point.X);
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maxY = Math.Max(maxY, point.Y);
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}
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return new Rect(minX, minY, maxX - minX, maxY - minY);
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}
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}
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}
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