QT全局热键（用nativeKeycode封装API，不跨平台）
在网上找了很长时间，大家都提到了一个QT全局热键库（qxtglobalshortcut），支持跨平台。在这篇文章中，我将只展示出windows平台下全局热键的设置。
这里提供的方法是在MyGlobalShortCut里面完成Windows的API封装，并在main.cpp中使用。
直接上代码：
MyWinEventFilter类：
class MyWinEventFilter :public QAbstractNativeEventFilter
{
public:
MyWinEventFilter(MyGlobalShortCut *shortcut);
~MyWinEventFilter();
virtual bool nativeEventFilter(const QByteArray &eventType, void *message, long*);
private:
MyGlobalShortCut *m_shortcut;
};
MyWinEventFilter::MyWinEventFilter(MyGlobalShortCut* shortcut) :m_shortcut(shortcut)
{}
MyWinEventFilter::~MyWinEventFilter()
{}
bool MyWinEventFilter::nativeEventFilter(const QByteArray &eventType, void message, long)
{
MSG *msg = static_cast(message);//static_cast<MSG*>(message)(把这段替换)
if (msg->message == WM_HOTKEY)
{
const quint32 keycode = HIWORD(msg->lParam);
const quint32 modifiers = LOWORD(msg->lParam);
bool res = m_shortcut->shortcuts.value(qMakePair(keycode, modifiers));
if (res)
{
m_shortcut->activateShortcut();
return true;
}
}
return false;
}
MyGlobalShortCut类：
class MyGlobalShortCut :public QObject
{
Q_OBJECT
public:
MyGlobalShortCut(QKeySequence key);
~MyGlobalShortCut();
void activateShortcut();
bool registerHotKey();
bool unregisterHotKey();
QHash<QPair<quint32, quint32>, MyGlobalShortCut*> shortcuts;
private:
QApplication *m_app;
MyWinEventFilter *m_filter;
QKeySequence m_key;
Qt::Key key;
Qt::KeyboardModifiers mods;
static quint32 nativeKeycode(Qt::Key keycode);
static quint32 nativeModifiers(Qt::KeyboardModifiers modifiers);
signals:
void activated();
};
MyGlobalShortCut::MyGlobalShortCut(QKeySequence key)
{
m_key = QKeySequence(key);
m_filter = new MyWinEventFilter(this);
m_app->installNativeEventFilter(m_filter);
registerHotKey();
}
MyGlobalShortCut::~MyGlobalShortCut()
{
unregisterHotKey();
}
void MyGlobalShortCut::activateShortcut()
{
emit activated();
}
bool MyGlobalShortCut::registerHotKey()
{
Qt::KeyboardModifiers allMods = Qt::ShiftModifier | Qt::ControlModifier | Qt::AltModifier | Qt::MetaModifier;
key = (m_key.isEmpty() ? Qt::Key(0) : Qt::Key((m_key[0] ^ allMods) & m_key[0]));
mods = m_key.isEmpty() ? Qt::KeyboardModifiers(0) : Qt::KeyboardModifiers(m_key[0] & allMods);
const quint32 nativeKey = nativeKeycode(key);
const quint32 nativeMods = nativeModifiers(mods);
shortcuts.insert(qMakePair(nativeKey, nativeMods), this);
return RegisterHotKey(0, nativeMods ^ nativeKey, nativeMods, nativeKey);
}
bool MyGlobalShortCut::unregisterHotKey()
{
return UnregisterHotKey(0, (quint32)nativeModifiers(mods) ^ (quint32)nativeKeycode(key));
}
quint32 MyGlobalShortCut::nativeKeycode(Qt::Key key)
{
switch (key)
{
case Qt::Key_Escape:
return VK_ESCAPE;
case Qt::Key_Tab:
case Qt::Key_Backtab:
return VK_TAB;
case Qt::Key_Backspace:
return VK_BACK;
case Qt::Key_Return:
case Qt::Key_Enter:
return VK_RETURN;
case Qt::Key_Insert:
return VK_INSERT;
case Qt::Key_Delete:
return VK_DELETE;
case Qt::Key_Pause:
return VK_PAUSE;
case Qt::Key_Print:
return VK_PRINT;
case Qt::Key_Clear:
return VK_CLEAR;
case Qt::Key_Home:
return VK_HOME;
case Qt::Key_End:
return VK_END;
case Qt::Key_Left:
return VK_LEFT;
case Qt::Key_Up:
return VK_UP;
case Qt::Key_Right:
return VK_RIGHT;
case Qt::Key_Down:
return VK_DOWN;
case Qt::Key_PageUp:
return VK_PRIOR;
case Qt::Key_PageDown:
return VK_NEXT;
case Qt::Key_F1:
return VK_F1;
case Qt::Key_F2:
return VK_F2;
case Qt::Key_F3:
return VK_F3;
case Qt::Key_F4:
return VK_F4;
case Qt::Key_F5:
return VK_F5;
case Qt::Key_F6:
return VK_F6;
case Qt::Key_F7:
return VK_F7;
case Qt::Key_F8:
return VK_F8;
case Qt::Key_F9:
return VK_F9;
case Qt::Key_F10:
return VK_F10;
case Qt::Key_F11:
return VK_F11;
case Qt::Key_F12:
return VK_F12;
case Qt::Key_F13:
return VK_F13;
case Qt::Key_F14:
return VK_F14;
case Qt::Key_F15:
return VK_F15;
case Qt::Key_F16:
return VK_F16;
case Qt::Key_F17:
return VK_F17;
case Qt::Key_F18:
return VK_F18;
case Qt::Key_F19:
return VK_F19;
case Qt::Key_F20:
return VK_F20;
case Qt::Key_F21:
return VK_F21;
case Qt::Key_F22:
return VK_F22;
case Qt::Key_F23:
return VK_F23;
case Qt::Key_F24:
return VK_F24;
case Qt::Key_Space:
return VK_SPACE;
case Qt::Key_Asterisk:
return VK_MULTIPLY;
case Qt::Key_Plus:
return VK_ADD;
case Qt::Key_Comma:
return VK_SEPARATOR;
case Qt::Key_Minus:
return VK_SUBTRACT;
case Qt::Key_Slash:
return VK_DIVIDE;
// numbers
case Qt::Key_0:
case Qt::Key_1:
case Qt::Key_2:
case Qt::Key_3:
case Qt::Key_4:
case Qt::Key_5:
case Qt::Key_6:
case Qt::Key_7:
case Qt::Key_8:
case Qt::Key_9:
return key;
// letters
case Qt::Key_A:
case Qt::Key_B:
case Qt::Key_C:
case Qt::Key_D:
case Qt::Key_E:
case Qt::Key_F:
case Qt::Key_G:
case Qt::Key_H:
case Qt::Key_I:
case Qt::Key_J:
case Qt::Key_K:
case Qt::Key_L:
case Qt::Key_M:
case Qt::Key_N:
case Qt::Key_O:
case Qt::Key_P:
case Qt::Key_Q:
case Qt::Key_R:
case Qt::Key_S:
case Qt::Key_T:
case Qt::Key_U:
case Qt::Key_V:
case Qt::Key_W:
case Qt::Key_X:
case Qt::Key_Y:
case Qt::Key_Z:
return key;
default:
return 0;
}
}
quint32 MyGlobalShortCut::nativeModifiers(Qt::KeyboardModifiers modifiers)
{
// MOD_ALT, MOD_CONTROL, (MOD_KEYUP), MOD_SHIFT, MOD_WIN
quint32 native = 0;
if (modifiers & Qt::ShiftModifier)
native |= MOD_SHIFT;
if (modifiers & Qt::ControlModifier)
native |= MOD_CONTROL;
if (modifiers & Qt::AltModifier)
native |= MOD_ALT;
if (modifiers & Qt::MetaModifier)
native |= MOD_WIN;
return native;
}
//////////////////////////////////////////////////////////////////////////////////////////////
上面是类的封装，下面是使用：
在main()函数中加入：
QKeySequence keySequence=QKeySequence(tr(“ALT+A”));//设置快捷键ALT+A
MyGlobalShortCut *shortcut=new MyGlobalShortCut(keySequence);
connect(shortcut,SIGNAL(activated()),this,SLOT(onActivated()));
onActivated()
{
//全局热键被激活之后要做的事
}
这只是针对windows系统的实现，由于工作中现在只涉及windows，其他系统类似，主要就是实现nativeEventFilter（）方法。
/////////////////////////////////////////////////////////////////////////////////////////////
(全文完)
http://blog.csdn.net/u011915578/article/details/46491055
