mirror of
https://github.com/glfw/glfw.git
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129 lines
4.5 KiB
C
129 lines
4.5 KiB
C
//========================================================================
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// GLFW - An OpenGL library
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// Platform: Win32/WGL
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// API version: 3.0
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// WWW: http://www.glfw.org/
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Marcus Geelnard
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// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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#include "internal.h"
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//========================================================================
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// Low level keyboard hook (system callback) function
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// Used to disable system keys under Windows NT
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//========================================================================
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static LRESULT CALLBACK keyboardHook(int nCode, WPARAM wParam, LPARAM lParam)
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{
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BOOL syskeys = FALSE;
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PKBDLLHOOKSTRUCT p;
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// We are only looking for keyboard events - interpret lParam as a
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// pointer to a KBDLLHOOKSTRUCT
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p = (PKBDLLHOOKSTRUCT) lParam;
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if (nCode == HC_ACTION)
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{
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// We have a keyboard event
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switch (wParam)
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{
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case WM_KEYDOWN:
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case WM_SYSKEYDOWN:
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case WM_KEYUP:
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case WM_SYSKEYUP:
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// Detect: ALT+TAB, ALT+ESC, ALT+F4, CTRL+ESC,
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// LWIN, RWIN, APPS (mysterious menu key)
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syskeys = (p->vkCode == VK_TAB &&
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p->flags & LLKHF_ALTDOWN) ||
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(p->vkCode == VK_ESCAPE &&
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p->flags & LLKHF_ALTDOWN) ||
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(p->vkCode == VK_F4 &&
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p->flags & LLKHF_ALTDOWN) ||
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(p->vkCode == VK_ESCAPE &&
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(GetKeyState(VK_CONTROL) & 0x8000)) ||
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p->vkCode == VK_LWIN ||
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p->vkCode == VK_RWIN ||
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p->vkCode == VK_APPS;
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break;
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default:
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break;
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}
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}
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// Was it a system key combination (e.g. ALT+TAB)?
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if (syskeys)
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{
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_GLFWwindow* window = _glfwLibrary.activeWindow;
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// Pass the key event to our window message loop
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if (window)
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PostMessage(window->Win32.handle, (UINT) wParam, p->vkCode, 0);
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// We've taken care of it - don't let the system know about this
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// key event
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return 1;
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}
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else
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{
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// It's a harmless key press, let the system deal with it
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return CallNextHookEx(_glfwLibrary.Win32.keyboardHook, nCode, wParam, lParam);
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}
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW platform API //////
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//////////////////////////////////////////////////////////////////////////
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//========================================================================
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// Enable system keys
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//========================================================================
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void _glfwPlatformEnableSystemKeys(_GLFWwindow* window)
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{
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if (_glfwLibrary.Win32.keyboardHook != NULL)
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{
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UnhookWindowsHookEx(_glfwLibrary.Win32.keyboardHook);
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_glfwLibrary.Win32.keyboardHook = NULL;
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}
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}
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//========================================================================
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// Disable system keys
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//========================================================================
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void _glfwPlatformDisableSystemKeys(_GLFWwindow* window)
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{
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_glfwLibrary.Win32.keyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL,
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keyboardHook,
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_glfwLibrary.Win32.instance,
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0);
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}
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