1 /*
2 *Copyright (C) 2004 Harold L Hunt II All Rights Reserved.
3 *
4 *Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 *"Software"), to deal in the Software without restriction, including
7 *without limitation the rights to use, copy, modify, merge, publish,
8 *distribute, sublicense, and/or sell copies of the Software, and to
9 *permit persons to whom the Software is furnished to do so, subject to
10 *the following conditions:
11 *
12 *The above copyright notice and this permission notice shall be
13 *included in all copies or substantial portions of the Software.
14 *
15 *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 *EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 *MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 *NONINFRINGEMENT. IN NO EVENT SHALL HAROLD L HUNT II BE LIABLE FOR
19 *ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
20 *CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21 *WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 *
23 *Except as contained in this notice, the name of Harold L Hunt II
24 *shall not be used in advertising or otherwise to promote the sale, use
25 *or other dealings in this Software without prior written authorization
26 *from Harold L Hunt II.
27 *
28 * Authors: Harold L Hunt II
29 */
30
31 #ifdef HAVE_XWIN_CONFIG_H
32 #include <xwin-config.h>
33 #endif
34 #include "win.h"
35
36 static HHOOK g_hhookKeyboardLL = NULL;
37
38 /*
39 * Function prototypes
40 */
41
42 static LRESULT CALLBACK
43 winKeyboardMessageHookLL(int iCode, WPARAM wParam, LPARAM lParam);
44
45 #ifndef LLKHF_EXTENDED
46 #define LLKHF_EXTENDED 0x00000001
47 #endif
48 #ifndef LLKHF_UP
49 #define LLKHF_UP 0x00000080
50 #endif
51
52 /*
53 * KeyboardMessageHook
54 */
55
56 static LRESULT CALLBACK
winKeyboardMessageHookLL(int iCode,WPARAM wParam,LPARAM lParam)57 winKeyboardMessageHookLL(int iCode, WPARAM wParam, LPARAM lParam)
58 {
59 BOOL fPassKeystroke = FALSE;
60 BOOL fPassAltTab = TRUE;
61 PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) lParam;
62 HWND hwnd = GetActiveWindow();
63
64 WindowPtr pWin = NULL;
65 winPrivWinPtr pWinPriv = NULL;
66 winPrivScreenPtr pScreenPriv = NULL;
67 winScreenInfo *pScreenInfo = NULL;
68
69 /* Check if the Windows window property for our X window pointer is valid */
70 if ((pWin = GetProp(hwnd, WIN_WINDOW_PROP)) != NULL) {
71 /* Get a pointer to our window privates */
72 pWinPriv = winGetWindowPriv(pWin);
73
74 /* Get pointers to our screen privates and screen info */
75 pScreenPriv = pWinPriv->pScreenPriv;
76 pScreenInfo = pScreenPriv->pScreenInfo;
77
78 if (pScreenInfo->fMultiWindow)
79 fPassAltTab = FALSE;
80 }
81
82 /* Pass keystrokes on to our main message loop */
83 if (iCode == HC_ACTION) {
84 winDebug("winKeyboardMessageHook: vkCode: %08x scanCode: %08x\n",
85 (unsigned int)p->vkCode, (unsigned int)p->scanCode);
86
87 switch (wParam) {
88 case WM_KEYDOWN:
89 case WM_SYSKEYDOWN:
90 case WM_KEYUP:
91 case WM_SYSKEYUP:
92 fPassKeystroke =
93 (fPassAltTab &&
94 (p->vkCode == VK_TAB) && ((p->flags & LLKHF_ALTDOWN) != 0))
95 || (p->vkCode == VK_LWIN) || (p->vkCode == VK_RWIN);
96 break;
97 }
98 }
99
100 /*
101 * Pass message on to our main message loop.
102 * We process this immediately with SendMessage so that the keystroke
103 * appears in, hopefully, the correct order.
104 */
105 if (fPassKeystroke) {
106 LPARAM lParamKey = 0x0;
107
108 /* Construct the lParam from KBDLLHOOKSTRUCT */
109 lParamKey = lParamKey | (0x0000FFFF & 0x00000001); /* Repeat count */
110 lParamKey = lParamKey | (0x00FF0000 & (p->scanCode << 16));
111 lParamKey = lParamKey
112 | (0x01000000 & ((p->flags & LLKHF_EXTENDED) << 23));
113 lParamKey = lParamKey
114 | (0x20000000 & ((p->flags & LLKHF_ALTDOWN) << 24));
115 lParamKey = lParamKey | (0x80000000 & ((p->flags & LLKHF_UP) << 24));
116
117 /* Send message to our main window that has the keyboard focus */
118 PostMessage(hwnd, (UINT) wParam, (WPARAM) p->vkCode, lParamKey);
119
120 return 1;
121 }
122
123 /* Call next hook */
124 return CallNextHookEx(NULL, iCode, wParam, lParam);
125 }
126
127 /*
128 * Attempt to install the keyboard hook, return FALSE if it was not installed
129 */
130
131 Bool
winInstallKeyboardHookLL(void)132 winInstallKeyboardHookLL(void)
133 {
134 /* Install the hook only once */
135 if (!g_hhookKeyboardLL)
136 g_hhookKeyboardLL = SetWindowsHookEx(WH_KEYBOARD_LL,
137 winKeyboardMessageHookLL,
138 g_hInstance, 0);
139
140 return TRUE;
141 }
142
143 /*
144 * Remove the keyboard hook if it is installed
145 */
146
147 void
winRemoveKeyboardHookLL(void)148 winRemoveKeyboardHookLL(void)
149 {
150 if (g_hhookKeyboardLL)
151 UnhookWindowsHookEx(g_hhookKeyboardLL);
152 g_hhookKeyboardLL = NULL;
153 }
154