[英]C++ Qt QShortcut with numpad key
QShortcut makes it easy to connect a QShortcutEvent (Key press, combination or sequence) to a slot method, eg: QShortcut可以轻松地将QShortcutEvent(按键,组合或序列)连接到插槽方法,例如:
QShortcut *shortcut = new QShortcut( QKeySequence(Qt::Key_7), this, 0, 0, Qt::ApplicationShortcut);
(Hint: for number keys, a QSignalMapper can be used to map the QShortcut's activated()
signal to a Slot with int
parameter). (提示:对于数字键,可以使用QSignalMapper将QShortcut的
activated()
信号映射到带有int
参数的Slot)。
However, in this example, with NumLock ( numpad enabled), both '7' keys will trigger the Shortcut's activated()
signal. 但是,在此示例中,使用NumLock(启用了numpad ),两个“7”键都将触发Shortcut的
activated()
信号。
Is there a way to detect the different keys other than filtering or reimplementing a widget's keyPressEvent and check QKeyEvent::modifiers() for Qt::KeypadModifier ? 除了过滤或重新实现小部件的keyPressEvent以及检查Qt :: KeypadModifier的 QKeyEvent :: modifiers()之外 ,有没有办法检测不同的键?
Digging further, I found 我发现,进一步挖掘
QTBUG-20191 Qt::KeypadModifier does not work with setShortcut linking to a patch that has been merged into 4.8 in Sept. 2012 and which comes with a test case using QTBUG-20191 Qt :: KeypadModifier不能与setShortcut链接到2012年9月合并到4.8的补丁 一起使用,后者附带一个测试用例
button2->setShortcut(Qt::Key_5 + Qt::KeypadModifier);
which does not work for my QShortcut on Qt 4.8.1, ie neither of the '7' keys are recognized using (adding) the modifier flag. 这对Qt 4.8.1上的QShortcut不起作用,即使用(添加)修饰符标志都不能识别'7'键。
So I guess the quickest way would be installing a filter to detect the modifier and let all other keyEvents be handled by the default implementation to be useable with QShortcut? 所以我想最快的方法是安装一个过滤器来检测修饰符,并让默认实现处理所有其他的keyEvent,以便与QShortcut一起使用?
For this you can use keyReleaseEvent (QKeyEvent *event) For example 为此,您可以使用keyReleaseEvent (QKeyEvent * event)例如
void Form::keyReleaseEvent(QKeyEvent *event) {
int key = event->nativeScanCode();
if( key == 79 ) //value for numpad 7
{
//your statement
}
}
You can use Qt.KeypadModifier
, For example [Python]: 您可以使用
Qt.KeypadModifier
,例如[Python]:
def keyPressEvent(self, event):
numpad_mod = int(event.modifiers()) & QtCore.Qt.KeypadModifier
if event.key() == QtCore.Qt.Key5 and numpad_mod:
#Numpad 5 clicked
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