clipboard-watcher/MainForm.cs

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using RyzStudio.Windows.ThemedForms;

namespace ClipboardWatcher
{
    public partial class MainForm : Form
    {
        [DllImport("User32.dll", CharSet = CharSet.Auto)]
        protected static extern IntPtr SetClipboardViewer(IntPtr hWndNewViewer);

        protected const int WM_DRAWCLIPBOARD = 0x308;

        protected IntPtr _clipboardViewer;
        protected bool isMonitoring = false;


        public MainForm()
        {
            InitializeComponent();

            memoBox1.TextBox.WordWrap = false;
        }

        protected override void WndProc(ref Message m)
        {
            if ((m.Msg == WM_DRAWCLIPBOARD) && this.IsMonitoring)
            {
                AddClipboardText();
            }

            base.WndProc(ref m);
        }


        public bool IsMonitoring
        {
            get => isMonitoring;
            set
            {
                isMonitoring = value;

                _clipboardViewer = (isMonitoring ? SetClipboardViewer(this.Handle) : default);

                button2.LabelText = (isMonitoring ? "Sto&p" : "&Start") + " Monitoring";
            }
        }


        /// <summary>
        /// New
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Clipboard.Clear();

            this.IsMonitoring = false;
        }

        /// <summary>
        /// Close
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void exitToolStripMenuItem2_Click(object sender, EventArgs e)
        {
            try
            {
                this.Close();
            }
            catch
            {
            }
        }

        /// <summary>
        /// Options
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void optionsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (this.IsMonitoring) return;

        }

        /// <summary>
        /// Help
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void viewHelpToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            try
            {
                System.Diagnostics.Process.Start(new ProcessStartInfo()
                {
                    FileName = AppResource.AppHelpURL,
                    UseShellExecute = true
                });
            }
            catch
            {
                // do nothing
            }
        }

        /// <summary>
        /// About
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void aboutToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            MessageBox.Show(Application.ProductName + " v" + Application.ProductVersion, "About", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }


        /// <summary>
        /// Start/stop monitoring
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_MouseClick(object sender, MouseEventArgs e)
        {
            Clipboard.Clear();

            this.IsMonitoring = !this.IsMonitoring;
        }

        /// <summary>
        /// Clear
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_MouseClick(object sender, MouseEventArgs e)
        {
            Clipboard.Clear();

            memoBox1.Text = string.Empty;
        }

        /// <summary>
        /// Close
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_MouseClick(object sender, MouseEventArgs e)
        {
            this.Close();
        }


        private void memoBox1_DragOver(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
            {
                if (this.IsMonitoring)
                {
                    e.Effect = DragDropEffects.None;
                }
                else
                {
                    e.Effect = DragDropEffects.Copy;
                }
            }
            else
            {
                e.Effect = DragDropEffects.None;
            }
        }

        private void memoBox1_DragDrop(object sender, DragEventArgs e)
        {
            if (this.IsMonitoring)
            {
                return;
            }

            string[] fileList = e.Data.GetData(DataFormats.FileDrop) as string[];
            if (fileList == null)
            {
                return;
            }

            foreach (string item in fileList)
            {
                memoBox1.Text += item + Environment.NewLine;
            }
        }


        private void AddClipboardText()
        {
            if (!Clipboard.ContainsText())
            {
                return;
            }

            var clipboardText = Clipboard.GetText();
            if (string.IsNullOrWhiteSpace(clipboardText))
            {
                return;
            }

            memoBox1.Text += clipboardText.Trim() + Environment.NewLine;
        }

    }
}