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#include <windows.h>
#include "hotkeys.h"
#include "stdio.h"
static LRESULT CALLBACK lowLevelKeyboardProc(int, WPARAM, LPARAM);
// Max number of hotkeys
#define MAX_HOTKEYS 5
// Max time interval between first and second part of hotkey (ms)
#define MAX_KEYS_TIME_INTERVAL 500
static HINSTANCE hInstance;
static HWND hGDWindow;
static HHOOK hKbdHook;
typedef struct HotkeyStruct
{
DWORD key1;
DWORD key2;
DWORD mods;
DWORD lasttime;
} HotkeyStruct;
static HotkeyStruct hotkeys[ MAX_HOTKEYS ];
__declspec (dllexport) void removeHook()
{
if( hKbdHook )
{
UnhookWindowsHookEx( hKbdHook );
hKbdHook = 0;
}
}
__declspec (dllexport) BOOL setHook( HWND hwnd )
{
hGDWindow = hwnd;
removeHook();
hKbdHook = SetWindowsHookEx( WH_KEYBOARD_LL, lowLevelKeyboardProc, hInstance, 0 );
return hKbdHook != 0;
}
__declspec (dllexport) BOOL setHotkeys( DWORD key1, DWORD key2, DWORD modifiers, int nom )
{
if( nom < 0 || nom >= MAX_HOTKEYS )
return FALSE;
hotkeys[ nom ].key1 = key1;
hotkeys[ nom ].key2 = key2;
hotkeys[ nom ].mods = modifiers;
hotkeys[ nom ].lasttime = 0;
return TRUE;
}
__declspec (dllexport) void clearHotkeys()
{
int i;
for( i = 0; i < MAX_HOTKEYS; i++ )
memset( hotkeys + i, 0, sizeof( HotkeyStruct ) );
}
static BOOL isModifiersPressed( DWORD modifiers )
{
int n = GetAsyncKeyState( VK_MENU ) & 0x8000;
if( ( ( modifiers & MOD_ALT ) && n == 0 )
|| ( ( modifiers & MOD_ALT ) == 0 && n ) )
return FALSE;
n = GetAsyncKeyState( VK_SHIFT ) & 0x8000;
if( ( ( modifiers & MOD_SHIFT ) && n == 0 )
|| ( ( modifiers & MOD_SHIFT ) == 0 && n ) )
return FALSE;
n = GetAsyncKeyState( VK_CONTROL ) & 0x8000;
if( ( ( modifiers & MOD_CONTROL ) && n == 0 )
|| ( ( modifiers & MOD_CONTROL ) == 0 && n ) )
return FALSE;
n = ( GetAsyncKeyState( VK_LWIN ) & 0x8000 ) | ( GetAsyncKeyState( VK_RWIN ) & 0x8000 );
if( ( ( modifiers & MOD_WIN ) && n == 0 )
|| ( ( modifiers & MOD_WIN ) == 0 && n ) )
return FALSE;
return TRUE;
}
static LRESULT CALLBACK lowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
int i;
PKBDLLHOOKSTRUCT p;
BOOL stop = FALSE;
if ( nCode < 0 ) return CallNextHookEx( hKbdHook, nCode, wParam, lParam );
if( nCode == HC_ACTION )
{
p = (PKBDLLHOOKSTRUCT)lParam;
for( ; ; )
{
// Check hotkeys
if( wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN )
{
DWORD new_time = GetTickCount();
// Check if key is second part of hotkey
for( i = 0; i < MAX_HOTKEYS; i++ )
{
if( hotkeys[ i ].key1 == 0 )
break;
if( hotkeys[ i ].key2 == 0 || hotkeys[ i ].lasttime == 0 )
continue;
if( hotkeys[ i ].key2 == p->vkCode && isModifiersPressed( hotkeys[ i ].mods ) )
{
if( new_time - hotkeys[ i ].lasttime <= MAX_KEYS_TIME_INTERVAL )
{
// Hotkey completed
// Clear all flags for first part
int j;
for( j = 0; j < MAX_HOTKEYS; j++ )
hotkeys[ j ].lasttime = 0;
PostMessage( hGDWindow, GD_HOTKEY_MESSAGE, (WPARAM)i, 0 );
stop = TRUE;
break;
}
else
{
// Interval exceeded, reset time
hotkeys[ i ].lasttime = new_time;
continue;
}
}
else
{
// Key is not second part, clear flag
hotkeys[ i ].lasttime = 0;
}
}
if( stop )
break;
// Check if key is first part of hotkey
for( i = 0; i < MAX_HOTKEYS; i++ )
{
if( hotkeys[ i ].key1 == 0 )
break;
if( hotkeys[ i ].key1 == p->vkCode && isModifiersPressed( hotkeys[ i ].mods ) )
{
// Match found
if( hotkeys[ i ].key2 == 0 )
{
// No second part, hotkey completed
// Clear all flags for first part
int j;
for( j = 0; j < MAX_HOTKEYS; j++ )
hotkeys[ j ].lasttime = 0;
PostMessage( hGDWindow, GD_HOTKEY_MESSAGE, (WPARAM)i, 0 );
stop = TRUE;
break;
}
else
{
// First part detected, need wait for second part
hotkeys[ i ].lasttime = new_time;
break;
}
}
}
}
break;
}
}
LRESULT result = CallNextHookEx(hKbdHook, nCode, wParam, lParam);
return ( stop ? 1 : result );
}
BOOL APIENTRY DllMain (HINSTANCE hInst /* Library instance handle. */ ,
DWORD reason /* Reason this function is being called. */ ,
LPVOID reserved /* Not used. */ )
{
(void) reserved;
switch (reason)
{
case DLL_PROCESS_ATTACH:
hInstance = hInst;
break;
case DLL_PROCESS_DETACH:
removeHook();
break;
case DLL_THREAD_ATTACH:
break;
case DLL_THREAD_DETACH:
break;
}
/* Returns TRUE on success, FALSE on failure */
return TRUE;
}
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