QKeyEvent 类描述键事件。 更多...
继承 QInputEvent .
QKeyEvent 类描述键事件。
Key events are sent to the widget with keyboard input focus when keys are pressed or released.
A key event contains a special accept flag that indicates whether the receiver will handle the key event. You should call ignore () if the key press or release event is not handled by your widget. A key event is propagated up the parent widget chain until a widget accepts it with accept () or an event filter consumes it. Key events for multimedia keys are ignored by default. You should call accept () if your widget handles those events.
The QWidget.setEnable() function can be used to enable or disable mouse and keyboard events for a widget.
事件处理程序 QWidget.keyPressEvent (), QWidget.keyReleaseEvent (), QGraphicsItem.keyPressEvent () and QGraphicsItem.keyReleaseEvent () receive key events.
构造键事件对象。
type 参数必须是 QEvent.KeyPress , QEvent.KeyRelease ，或 QEvent.ShortcutOverride .
Int key is the code for the Qt.Key that the event loop should listen for. If key is 0, the event is not a result of a known key; for example, it may be the result of a compose sequence or keyboard macro. The modifiers holds the keyboard modifiers, and the given text is the Unicode text that the key generated. If autorep is true, isAutoRepeat () will be true. count is the number of keys involved in the event.
Returns the number of keys involved in this event. If text () is not empty, this is simply the length of the string.
另请参阅 Qt.WA_KeyCompression .
Returns true if this event comes from an auto-repeating key; returns false if it comes from an initial key press.
Note that if the event is a multiple-key compressed event that is partly due to auto-repeat, this function could return either true or false indeterminately.
Returns the code of the key that was pressed or released.
见 Qt.Key for the list of keyboard codes. These codes are independent of the underlying window system. Note that this function does not distinguish between capital and non-capital letters, use the text () function (returning the Unicode text the key generated) for this purpose.
A value of either 0 or Qt.Key_unknown means that the event is not the result of a known key; for example, it may be the result of a compose sequence, a keyboard macro, or due to key event compression.
另请参阅 Qt.WA_KeyCompression .
Returns true if the key event matches the given standard key ；否则返回 false。
该函数在 Qt 4.2 引入。
Returns the keyboard modifier flags that existed immediately after the event occurred.
警告： This function cannot always be trusted. The user can confuse it by pressing both Shift keys simultaneously and releasing one of them, for example.
另请参阅 QApplication.keyboardModifiers ().
Returns the native modifiers of a key event. If the key event does not contain this data 0 is returned.
Note: The native modifiers may be 0, even if the key event contains extended information.
该函数在 Qt 4.2 引入。
Returns the native scan code of the key event. If the key event does not contain this data 0 is returned.
Note: The native scan code may be 0, even if the key event contains extended information.
Note: On Mac OS/X, this function is not useful, because there is no way to get the scan code from Carbon or Cocoa. The function always returns 1 (or 0 in the case explained above).
该函数在 Qt 4.2 引入。
Returns the native virtual key, or key sym of the key event. If the key event does not contain this data 0 is returned.
Note: The native virtual key may be 0, even if the key event contains extended information.
该函数在 Qt 4.2 引入。
Returns the Unicode text that this key generated. The text returned can be an empty string in cases where modifier keys, such as Shift, Control, Alt, and Meta, are being pressed or released. In such cases key () will contain a valid value.
另请参阅 Qt.WA_KeyCompression .
