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ScreensaverForm.cs
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ScreensaverForm.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Microsoft.Win32;
using System.Diagnostics;
namespace pl.polidea.lab.Web_Page_Screensaver
{
public partial class ScreensaverForm : Form
{
private DateTime StartTime;
private Timer timer;
private int currentSiteIndex = -1;
private GlobalUserEventHandler userEventHandler;
private bool shuffleOrder;
private List<string> urls;
private PreferencesManager prefsManager = new PreferencesManager();
private int screenNum;
[ThreadStatic]
private static Random random;
public ScreensaverForm(int? screenNumber = null)
{
userEventHandler = new GlobalUserEventHandler();
userEventHandler.Event += new GlobalUserEventHandler.UserEvent(HandleUserActivity);
if (screenNumber == null) screenNum = prefsManager.EffectiveScreensList.FindIndex(s => s.IsPrimary);
else screenNum = (int)screenNumber;
InitializeComponent();
Cursor.Hide();
}
public List<string> Urls
{
get
{
if (urls == null)
{
urls = prefsManager.GetUrlsByScreen(screenNum);
}
return urls;
}
}
private void ScreensaverForm_Load(object sender, EventArgs e)
{
if (Urls.Any())
{
if (Urls.Count > 1)
{
// Shuffle the URLs if necessary
shuffleOrder = prefsManager.GetRandomizeFlagByScreen(screenNum);
if (shuffleOrder)
{
random = new Random();
int n = urls.Count;
while (n > 1)
{
n--;
int k = random.Next(n + 1);
var value = urls[k];
urls[k] = urls[n];
urls[n] = value;
}
}
// Set up timer to rotate to the next URL
timer = new Timer();
timer.Interval = prefsManager.GetRotationIntervalByScreen(screenNum) * 1000;
timer.Tick += (s, ee) => RotateSite();
timer.Start();
}
// Display the first site in the list
RotateSite();
StartTime = DateTime.Now;
}
else
{
webBrowser.Visible = false;
}
}
private void BrowseTo(string url)
{
// Disable the user event handler while navigating
Application.RemoveMessageFilter(userEventHandler);
if (string.IsNullOrWhiteSpace(url))
{
webBrowser.Visible = false;
}
else
{
webBrowser.Visible = true;
try
{
Debug.WriteLine($"Navigating: {url}");
webBrowser.Navigate(url);
}
catch
{
// This can happen if IE pops up a window that isn't closed before the next call to Navigate()
}
}
Application.AddMessageFilter(userEventHandler);
}
private void RotateSite()
{
currentSiteIndex++;
if (currentSiteIndex >= Urls.Count)
{
currentSiteIndex = 0;
}
var url = Urls[currentSiteIndex];
BrowseTo(url);
}
private void HandleUserActivity()
{
if (StartTime.AddSeconds(1) > DateTime.Now) return;
if (prefsManager.CloseOnActivity)
{
Close();
}
else
{
closeButton.Visible = true;
Cursor.Show();
}
}
private void closeButton_Click(object sender, EventArgs e)
{
Close();
}
}
public class GlobalUserEventHandler : IMessageFilter
{
public delegate void UserEvent();
private const int WM_MOUSEMOVE = 0x0200;
private const int WM_MBUTTONDBLCLK = 0x209;
private const int WM_KEYDOWN = 0x100;
private const int WM_KEYUP = 0x101;
// screensavers and especially multi-window apps can get spurrious WM_MOUSEMOVE events
// that don't actually involve any movement (cursor chnages and some mouse driver software
// can generate them, for example) - so we record the actual mouse position and compare against it for actual movement.
private Point? lastMousePos;
public event UserEvent Event;
public bool PreFilterMessage(ref Message m)
{
if ((m.Msg == WM_MOUSEMOVE) && (this.lastMousePos == null))
{
this.lastMousePos = Cursor.Position;
}
if (((m.Msg == WM_MOUSEMOVE) && (Cursor.Position != this.lastMousePos))
|| (m.Msg > WM_MOUSEMOVE && m.Msg <= WM_MBUTTONDBLCLK) || m.Msg == WM_KEYDOWN || m.Msg == WM_KEYUP)
{
if (Event != null)
{
Event();
}
}
// Always allow message to continue to the next filter control
return false;
}
}
}