Update 2

Signed-off-by: Lev Rusanov <30170278+JDM170@users.noreply.github.com>

MainForm.cs

@@ -1,24 +1,59 @@
 using System;
 using System.Drawing;
 using System.Windows.Forms;
+using System.Runtime.InteropServices;
 
 namespace ScreenCaptureApp
 {
     public partial class MainForm : Form
     {
+        // Импорт функции для регистрации горячих клавиш
+        [DllImport("user32.dll")]
+        private static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);
+
+        [DllImport("user32.dll")]
+        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
+
+        private const int WM_HOTKEY = 0x0312;
+        private const int PRINT_SCREEN_ID = 1;
+        private bool captureOnKeyPress = true;
+
         public MainForm()
         {
             InitializeComponent();
+            RegisterHotkey();
+            this.WindowState = FormWindowState.Minimized;
+            this.ShowInTaskbar = false;
         }
 
-        private void btnCapture_Click(object sender, EventArgs e)
+        private void RegisterHotkey()
+        {
+            // Регистрируем Print Screen (0x2C) без модификаторов (0x0)
+            if (!RegisterHotKey(this.Handle, PRINT_SCREEN_ID, 0x0, 0x2C))
+            {
+                MessageBox.Show("Failed to register Print Screen hotkey", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+
+        protected override void WndProc(ref Message m)
+        {
+            if (m.Msg == WM_HOTKEY && captureOnKeyPress)
+            {
+                if (m.WParam.ToInt32() == PRINT_SCREEN_ID)
+                {
+                    CaptureScreen();
+                }
+            }
+            base.WndProc(ref m);
+        }
+
+        private void CaptureScreen()
         {
             this.Hide();
             using (var captureForm = new ScreenCaptureForm())
             {
                 if (captureForm.ShowDialog() == DialogResult.OK)
                 {
-                    // Добавляем кнопки для выбора действия
                     using (var resultForm = new ResultForm(captureForm.CapturedImage))
                     {
                         if (resultForm.ShowDialog() == DialogResult.OK)
@@ -75,5 +110,33 @@ namespace ScreenCaptureApp
                 default: return System.Drawing.Imaging.ImageFormat.Png;
             }
         }
+
+        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
+        {
+            UnregisterHotKey(this.Handle, PRINT_SCREEN_ID);
+        }
+
+        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
+        {
+            this.WindowState = FormWindowState.Normal;
+            this.ShowInTaskbar = true;
+        }
+
+        private void showToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            this.WindowState = FormWindowState.Normal;
+            this.ShowInTaskbar = true;
+        }
+
+        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            Application.Exit();
+        }
+
+        private void toggleHotkeyToolStripMenuItem_Click(object sender, EventArgs e)
+        {
+            captureOnKeyPress = !captureOnKeyPress;
+            toggleHotkeyToolStripMenuItem.Text = captureOnKeyPress ? "Disable Print Screen capture" : "Enable Print Screen capture";
+        }
     }
 }