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Fade Selected Monitor to Black

Fades the selected monitor to black over a two second period. On the second run, the monitor unfades.
Minimum Version
Created By
Keith Lammers (BFS)
Date Created
Aug 28, 2017
Date Last Modified
Nov 5, 2019

Scripted Function (Macro) Code

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Threading;
using System.Collections.Generic;

// Based entirely on NetMage's "Fade All Monitors Except the Primary Monitor to Black" which was based on Thomas' "Dim All Monitors Except Primary"

public static class DisplayFusionFunction {
	private static readonly string SettingName = "BlackenMonitors_Run";
	public static void Run(IntPtr windowHandle) {
		//toggle the setting from running to not running, and vice versa

		if (RunFadeMonitors()) {
            //add the selected monitor to the form
            var forms = new List<Form>();
            forms.Add(new TransparentForm(BFS.Monitor.ShowMonitorSelector()));
            //this will open the forms we added to the list by using our custom application context
            Application.Run(new MultipleFormApplicationContext(forms));
	//this function allows us to see the currect state of the script
	private static bool RunFadeMonitors() {
		return BFS.ScriptSettings.ReadValue(SettingName) == "run";

	//this function toggles the script settings from running to not running
	private static void ToggleSetting() {
		BFS.ScriptSettings.WriteValue(SettingName, RunFadeMonitors() ? "not" : "run");

	//extend the ApplicationContext class to support opening multiple forms
	private class MultipleFormApplicationContext : ApplicationContext {
		internal MultipleFormApplicationContext(List<Form> forms) {
			//open each of the forms, and add our closing event to them
			foreach(Form form in forms) {
				form.FormClosed += OnFormClosed;

		//when all the forms close, make sure to exit the application
		private void OnFormClosed(object sender, EventArgs e) {
			if(Application.OpenForms.Count == 0)
	//extend the Form class to get the behavior we want
	private class TransparentForm : Form {
		//this will tell us what monitor to open on
		private uint MonitorId;
		private uint FadeWait;
		private decimal TransparentIncrement;
        private IntPtr HandleTHREADSAFE;
		//this will tell us our current transparency
		private decimal Transparency;
		//the contructor for our class
		internal TransparentForm(uint monitorId) {		
			MonitorId = monitorId;
			Transparency = 0m;
			const decimal FadeTime = 2.0m; // seconds
			TransparentIncrement = 1m; // percent
			FadeWait = (uint)(TransparentIncrement * 10m * FadeTime);
			//setup the layout of this form
			BackColor = Color.Black;
			FormBorderStyle = FormBorderStyle.None;
			ShowInTaskbar = false;
			//move the window to the desired monitor
			Rectangle bounds = BFS.Monitor.GetMonitorBoundsByID(MonitorId);
			Location = new Point(bounds.X, bounds.Y);
			Size = new Size(bounds.Width, bounds.Height);
			StartPosition = FormStartPosition.Manual;
			BFS.Window.SetAlwaysOnTop(Handle, true);
			BFS.Window.SetTransparency(Handle, Transparency);

			//setup the form load event
			Load += Form_Load;			
		private void Form_Load(object sender, EventArgs e) {
        	HandleTHREADSAFE = Handle;
			//add a windows style to the current style that will
			//tell this window to ignore user input
			uint style = (uint)BFS.Window.GetWindowStyleEx(Handle) | (uint)BFS.WindowEnum.WindowStyleEx.WS_EX_TRANSPARENT | (uint)BFS.WindowEnum.WindowStyleEx.WS_EX_LAYERED;
			BFS.Window.SetWindowStyleEx((BFS.WindowEnum.WindowStyleEx)style, Handle);
			//start up a thread to listen for an exit event
			new Thread(new ThreadStart(ExitListener)).Start();

		private void ExitListener() {
        	try {
              while(true) {
                  //if we should close, tell the main thread to close the form
                  if(RunFadeMonitors()) {
                      // Fade to Black
                      if (Transparency < 100m) {
                          Transparency += TransparentIncrement;
                          BFS.Window.SetTransparency(HandleTHREADSAFE, Transparency);

                      BFS.General.ThreadWait((Transparency < 100m) ? FadeWait : 250u);				
                  else {
                      if (this.Transparency > 0m) {
                          // Fade back in
                          Transparency -= TransparentIncrement;
                          BFS.Window.SetTransparency(HandleTHREADSAFE, Transparency);

                          BFS.General.ThreadWait((Transparency < 100m) ? FadeWait : 250u);
                      else {
                          try {
                              this.Invoke((MethodInvoker) delegate {
                          catch { //something went wrong, ignore

          catch { }