92 lines
2.6 KiB
C#
92 lines
2.6 KiB
C#
/*
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* Copyright (c) 2019 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 SafeExamBrowser.Logging.Contracts;
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using SafeExamBrowser.Monitoring.Contracts;
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using SafeExamBrowser.Monitoring.Contracts.Events;
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using SafeExamBrowser.WindowsApi.Contracts;
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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 activeWindow;
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private Guid? captureHookId;
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private Guid? foregroundHookId;
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private ILogger logger;
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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($"Failed to hide window '{title}' with handle = {window}!");
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}
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return success;
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}
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public void StartMonitoringWindows()
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{
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captureHookId = nativeMethods.RegisterSystemCaptureStartEvent(OnWindowChanged);
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logger.Info($"Registered system capture start event with ID = {captureHookId}.");
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foregroundHookId = nativeMethods.RegisterSystemForegroundEvent(OnWindowChanged);
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logger.Info($"Registered system foreground event with ID = {foregroundHookId}.");
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}
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public void StopMonitoringWindows()
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{
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if (captureHookId.HasValue)
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{
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nativeMethods.DeregisterSystemEventHook(captureHookId.Value);
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logger.Info($"Unregistered system capture start event with ID = {captureHookId}.");
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}
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if (foregroundHookId.HasValue)
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{
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nativeMethods.DeregisterSystemEventHook(foregroundHookId.Value);
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logger.Info($"Unregistered system foreground event with ID = {foregroundHookId}.");
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}
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}
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private void OnWindowChanged(IntPtr window)
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{
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if (window != IntPtr.Zero && activeWindow != window)
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{
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logger.Debug($"Window has changed from {activeWindow} to {window}.");
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activeWindow = window;
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WindowChanged?.Invoke(window);
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}
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}
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}
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}
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