notgne2/tuxpaint-pencil-sharpener
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Added code to hook low-level keyboard events on 2K/XP/Vista.

Browse source 
The hook is only installed if in full-screen mode.
Filters out the left and right Windows keys to avoid accidentally dropping
out of full-screen mode.
If Tux Paint is deliberately switched to the background (using ALT-TAB, say)
the Windows keys function as normal until Tux Paint is the active
application again.
This commit is contained in:
John Popplewell 2008-07-10 20:57:25 +00:00
parent 8d44381a1d
commit b878e9646e
3 changed files with 76 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

53
src/win32_print.c
View file

@ -589,3 +589,56 @@ char *get_temp_fname(const char *const name)
return strdup(f);
}
/*
* Nasty low-level hook into the keyboard. 2K/XP/Vista only.
*/
static HHOOK g_hKeyboardHook = NULL;
static int g_bWindowActive = 0;
LRESULT CALLBACK LowLevelKeyboardProc(int nCode, WPARAM wParam, LPARAM lParam)
{
int bEatKeystroke = 0;
KBDLLHOOKSTRUCT *p = (KBDLLHOOKSTRUCT*)lParam;
if (nCode < 0 || nCode != HC_ACTION)
return CallNextHookEx(g_hKeyboardHook, nCode, wParam, lParam);
switch (wParam)
{
case WM_KEYDOWN:
case WM_KEYUP:
{
bEatKeystroke = g_bWindowActive && ((p->vkCode == VK_LWIN) || (p->vkCode == VK_RWIN));
break;
}
}
if(bEatKeystroke)
return 1;
return CallNextHookEx(g_hKeyboardHook, nCode, wParam, lParam);
}
int InstallKeyboardHook(void)
{
if (g_hKeyboardHook)
return -1;
g_hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, LowLevelKeyboardProc, GetModuleHandle(NULL), 0);
return g_hKeyboardHook ? 0 : -2;
}
int RemoveKeyboardHook(void)
{
if (!g_hKeyboardHook)
return -1;
UnhookWindowsHookEx(g_hKeyboardHook);
g_hKeyboardHook = NULL;
return 0;
}
void SetActivationState(int state)
{
g_bWindowActive = state;
}