first commit

Forms/OverlayForm.cs

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+using anjianjingling.Native;
+
+namespace anjianjingling.Forms
+{
+    /// <summary>
+    /// 全屏框选截图：鼠标拖拽框选区域，松开后截图保存到 images 目录。
+    /// ESC 取消。
+    /// </summary>
+    public sealed class OverlayForm : Form
+    {
+        private Point _start, _end;
+        private bool _dragging;
+        private Rectangle _selected;
+        public string? SavedPath { get; private set; }
+        public event Action<string>? OnSaved;
+
+        /// <summary>是否把框选结果保存为图片（录屏取区域时设为 false）。</summary>
+        [System.ComponentModel.Browsable(false)]
+        [System.ComponentModel.DesignerSerializationVisibility(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
+        public bool SaveToFile { get; set; } = true;
+
+        /// <summary>最近一次框选的屏幕矩形。</summary>
+        [System.ComponentModel.Browsable(false)]
+        [System.ComponentModel.DesignerSerializationVisibility(System.ComponentModel.DesignerSerializationVisibility.Hidden)]
+        public Rectangle SelectedRect { get; private set; }
+
+        public OverlayForm()
+        {
+            FormBorderStyle = FormBorderStyle.None;
+            StartPosition = FormStartPosition.Manual;
+            Bounds = SystemInformation.VirtualScreen;
+            TopMost = true;
+            ShowInTaskbar = false;
+            DoubleBuffered = true;
+            KeyPreview = true;
+            BackColor = Color.Black;
+            Opacity = 0.25;
+            Cursor = Cursors.Cross;
+
+            MouseDown += (s, e) =>
+            {
+                if (e.Button == MouseButtons.Left)
+                {
+                    _dragging = true;
+                    _start = _end = PointToScreen(e.Location);
+                }
+            };
+            MouseMove += (s, e) =>
+            {
+                if (_dragging)
+                {
+                    _end = PointToScreen(e.Location);
+                    var r = RectangleFromPoints(_start, _end);
+                    _selected = r;
+                    Invalidate();
+                }
+            };
+            MouseUp += (s, e) =>
+            {
+                if (_dragging && e.Button == MouseButtons.Left)
+                {
+                    _dragging = false;
+                    var r = RectangleFromPoints(_start, _end);
+                    if (r.Width > 4 && r.Height > 4)
+                    {
+                        SelectedRect = r;
+                        if (SaveToFile)
+                        {
+                            string dir = Path.Combine(AppContext.BaseDirectory, "images");
+                            Directory.CreateDirectory(dir);
+                            string file = Path.Combine(dir,
+                                $"clip_{DateTime.Now:yyyyMMdd_HHmmss}.png");
+                            using (var bmp = new Bitmap(r.Width, r.Height))
+                            using (var g = Graphics.FromImage(bmp))
+                            {
+                                g.CopyFromScreen(r.Left, r.Top, 0, 0, r.Size);
+                                bmp.Save(file, System.Drawing.Imaging.ImageFormat.Png);
+                            }
+                            SavedPath = file;
+                            OnSaved?.Invoke(file);
+                        }
+                        DialogResult = DialogResult.OK;
+                        Close();
+                        return;
+                    }
+                    Invalidate();
+                }
+            };
+            KeyDown += (s, e) =>
+            {
+                if (e.KeyCode == Keys.Escape)
+                {
+                    DialogResult = DialogResult.Cancel;
+                    Close();
+                }
+            };
+        }
+
+        protected override void OnPaint(PaintEventArgs e)
+        {
+            base.OnPaint(e);
+            if (_selected.Width > 0)
+            {
+                // 用屏幕坐标转客户区绘制
+                var r = ScreenRectToClient(_selected);
+                using (var pen = new Pen(Color.Lime, 1))
+                {
+                    e.Graphics.DrawRectangle(pen, r);
+                    string info = $"{_selected.Width} x {_selected.Height}  ({_selected.Left},{_selected.Top})";
+                    using var font = new Font("Consolas", 9F);
+                    var sz = e.Graphics.MeasureString(info, font);
+                    float ty = r.Top - sz.Height - 2;
+                    if (ty < 0) ty = r.Bottom + 2;
+                    using var bg = new SolidBrush(Color.Lime);
+                    e.Graphics.FillRectangle(bg, r.Left, ty, sz.Width, sz.Height);
+                    e.Graphics.DrawString(info, font, Brushes.Black, r.Left, ty);
+                }
+            }
+        }
+
+        private static Rectangle RectangleFromPoints(Point a, Point b)
+            => Rectangle.FromLTRB(
+                Math.Min(a.X, b.X), Math.Min(a.Y, b.Y),
+                Math.Max(a.X, b.X), Math.Max(a.Y, b.Y));
+
+        private Rectangle ScreenRectToClient(Rectangle screen)
+        {
+            var a = PointToClient(new Point(screen.Left, screen.Top));
+            var b = PointToClient(new Point(screen.Right, screen.Bottom));
+            return new Rectangle(a.X, a.Y, b.X - a.X, b.Y - a.Y);
+        }
+    }
+}