improve:截图功能

2025-07-30 20:06:29 +08:00
parent 00554e066b
commit 457832fbbe
2 changed files with 228 additions and 0 deletions
@@ -0,0 +1,168 @@
+using System;
+using System.Drawing;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Media;
+
+// 为了避免命名冲突，使用别名
+using WpfCanvas = System.Windows.Controls.Canvas;
+
+namespace Ink_Canvas
+{
+    public partial class ScreenshotSelectorWindow : Window
+    {
+        private bool _isSelecting = false;
+        private System.Windows.Point _startPoint;
+        private System.Windows.Point _currentPoint;
+        
+        public Rectangle? SelectedArea { get; private set; }
+
+        public ScreenshotSelectorWindow()
+        {
+            InitializeComponent();
+            
+            // 设置窗口覆盖所有屏幕
+            SetupFullScreenOverlay();
+            
+            // 隐藏提示文字的定时器
+            var timer = new System.Windows.Threading.DispatcherTimer();
+            timer.Interval = TimeSpan.FromSeconds(3);
+            timer.Tick += (s, e) =>
+            {
+                HintText.Visibility = Visibility.Collapsed;
+                timer.Stop();
+            };
+            timer.Start();
+        }
+
+        private void SetupFullScreenOverlay()
+        {
+            // 获取所有屏幕的虚拟屏幕边界
+            var virtualScreen = System.Windows.Forms.SystemInformation.VirtualScreen;
+
+            // 转换为WPF坐标系统
+            var dpiScale = GetDpiScale();
+
+            this.Left = virtualScreen.Left / dpiScale;
+            this.Top = virtualScreen.Top / dpiScale;
+            this.Width = virtualScreen.Width / dpiScale;
+            this.Height = virtualScreen.Height / dpiScale;
+        }
+
+        private double GetDpiScale()
+        {
+            var source = PresentationSource.FromVisual(this);
+            if (source?.CompositionTarget != null)
+            {
+                return source.CompositionTarget.TransformToDevice.M11;
+            }
+            return 1.0; // 默认DPI
+        }
+
+        private void Window_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Escape)
+            {
+                // 取消截图
+                SelectedArea = null;
+                DialogResult = false;
+                Close();
+            }
+        }
+
+        private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
+        {
+            _isSelecting = true;
+            _startPoint = e.GetPosition(this);
+            _currentPoint = _startPoint;
+            
+            // 隐藏提示文字
+            HintText.Visibility = Visibility.Collapsed;
+            
+            // 显示选择矩形
+            SelectionRectangle.Visibility = Visibility.Visible;
+            SizeInfoBorder.Visibility = Visibility.Visible;
+            
+            // 捕获鼠标
+            CaptureMouse();
+            
+            UpdateSelection();
+        }
+
+        private void Window_MouseMove(object sender, MouseEventArgs e)
+        {
+            if (_isSelecting)
+            {
+                _currentPoint = e.GetPosition(this);
+                UpdateSelection();
+            }
+        }
+
+        private void Window_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
+        {
+            if (_isSelecting)
+            {
+                _isSelecting = false;
+                ReleaseMouseCapture();
+
+                // 计算选择区域
+                var rect = GetSelectionRectangle();
+                if (rect.Width > 5 && rect.Height > 5) // 最小尺寸检查
+                {
+                    // 转换为屏幕坐标，考虑DPI缩放
+                    var dpiScale = GetDpiScale();
+                    var virtualScreen = System.Windows.Forms.SystemInformation.VirtualScreen;
+
+                    // 计算实际屏幕坐标
+                    int screenX = (int)((rect.X * dpiScale) + virtualScreen.Left);
+                    int screenY = (int)((rect.Y * dpiScale) + virtualScreen.Top);
+                    int screenWidth = (int)(rect.Width * dpiScale);
+                    int screenHeight = (int)(rect.Height * dpiScale);
+
+                    SelectedArea = new Rectangle(screenX, screenY, screenWidth, screenHeight);
+                    DialogResult = true;
+                }
+                else
+                {
+                    SelectedArea = null;
+                    DialogResult = false;
+                }
+
+                Close();
+            }
+        }
+
+        private void UpdateSelection()
+        {
+            var rect = GetSelectionRectangle();
+
+            // 更新选择矩形
+            WpfCanvas.SetLeft(SelectionRectangle, rect.X);
+            WpfCanvas.SetTop(SelectionRectangle, rect.Y);
+            SelectionRectangle.Width = rect.Width;
+            SelectionRectangle.Height = rect.Height;
+
+            // 更新尺寸信息
+            SizeInfoText.Text = $"{(int)rect.Width} x {(int)rect.Height}";
+            WpfCanvas.SetLeft(SizeInfoBorder, rect.X);
+            WpfCanvas.SetTop(SizeInfoBorder, rect.Y - 30);
+
+            // 确保尺寸信息不超出屏幕
+            if (WpfCanvas.GetTop(SizeInfoBorder) < 0)
+            {
+                WpfCanvas.SetTop(SizeInfoBorder, rect.Y + rect.Height + 5);
+            }
+        }
+
+        private Rect GetSelectionRectangle()
+        {
+            double x = Math.Min(_startPoint.X, _currentPoint.X);
+            double y = Math.Min(_startPoint.Y, _currentPoint.Y);
+            double width = Math.Abs(_currentPoint.X - _startPoint.X);
+            double height = Math.Abs(_currentPoint.Y - _startPoint.Y);
+            
+            return new Rect(x, y, width, height);
+        }
+    }
+}