127 lines
3.5 KiB
C#
127 lines
3.5 KiB
C#
/*
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* Copyright (c) 2017 ETH Zürich, Educational Development and Technology (LET)
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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using System;
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using System.Collections.Generic;
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using SafeExamBrowser.Contracts.Logging;
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using SafeExamBrowser.Contracts.Monitoring;
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using SafeExamBrowser.Contracts.WindowsApi;
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namespace SafeExamBrowser.Monitoring.Windows
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{
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public class WindowMonitor : IWindowMonitor
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{
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private IntPtr captureStartHookHandle;
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private IntPtr foregroundHookHandle;
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private ILogger logger;
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private IList<Window> minimizedWindows = new List<Window>();
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private INativeMethods nativeMethods;
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public event WindowChangedEventHandler WindowChanged;
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public WindowMonitor(ILogger logger, INativeMethods nativeMethods)
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{
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this.logger = logger;
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this.nativeMethods = nativeMethods;
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}
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public void Close(IntPtr window)
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{
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var title = nativeMethods.GetWindowTitle(window);
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nativeMethods.SendCloseMessageTo(window);
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logger.Info($"Sent close message to window '{title}' with handle = {window}.");
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}
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public bool Hide(IntPtr window)
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{
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var title = nativeMethods.GetWindowTitle(window);
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var success = nativeMethods.HideWindow(window);
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if (success)
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{
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logger.Info($"Hid window '{title}' with handle = {window}.");
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}
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else
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{
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logger.Warn($"Failed to hide window '{title}' with handle = {window}!");
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}
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return success;
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}
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public void HideAllWindows()
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{
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logger.Info("Saving windows to be minimized...");
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foreach (var handle in nativeMethods.GetOpenWindows())
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{
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var window = new Window
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{
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Handle = handle,
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Title = nativeMethods.GetWindowTitle(handle)
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};
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minimizedWindows.Add(window);
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logger.Info($"Saved window '{window.Title}' with handle = {window.Handle}.");
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}
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logger.Info("Minimizing all open windows...");
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nativeMethods.MinimizeAllOpenWindows();
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logger.Info("Open windows successfully minimized.");
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}
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public void RestoreHiddenWindows()
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{
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logger.Info("Restoring all minimized windows...");
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foreach (var window in minimizedWindows)
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{
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nativeMethods.RestoreWindow(window.Handle);
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logger.Info($"Restored window '{window.Title}' with handle = {window.Handle}.");
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}
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logger.Info("Minimized windows successfully restored.");
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}
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public void StartMonitoringWindows()
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{
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captureStartHookHandle = nativeMethods.RegisterSystemCaptureStartEvent(OnWindowChanged);
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logger.Info($"Registered system capture start event with handle = {captureStartHookHandle}.");
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foregroundHookHandle = nativeMethods.RegisterSystemForegroundEvent(OnWindowChanged);
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logger.Info($"Registered system foreground event with handle = {foregroundHookHandle}.");
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}
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public void StopMonitoringWindows()
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{
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if (captureStartHookHandle != IntPtr.Zero)
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{
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nativeMethods.UnregisterSystemEvent(captureStartHookHandle);
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logger.Info($"Unregistered system capture start event with handle = {captureStartHookHandle}.");
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}
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if (foregroundHookHandle != IntPtr.Zero)
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{
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nativeMethods.UnregisterSystemEvent(foregroundHookHandle);
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logger.Info($"Unregistered system foreground event with handle = {foregroundHookHandle}.");
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}
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}
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private void OnWindowChanged(IntPtr window)
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{
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WindowChanged?.Invoke(window);
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}
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private struct Window
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{
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internal IntPtr Handle { get; set; }
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internal string Title { get; set; }
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}
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}
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}
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