内容

• 特性
• 方法
• 详细描述

KeyEvent QML Type

Provides information about a key event 更多...

import 语句：

import QtQuick 2.7

• 所有成员列表，包括继承成员

特性

• accepted : bool
• count : int
• isAutoRepeat : bool
• key : int
• modifiers : int
• nativeScanCode : quint32
• text : string

方法

• bool matches (StandardKey key )

详细描述

For example, the following changes the Item's state property when the Enter key is pressed:

Item {
    focus: true
    Keys.onPressed: { if (event.key == Qt.Key_Enter) state = 'ShowDetails'; }
}
					

特性文档编制

accepted : bool

设置 accepted to true prevents the key event from being propagated to the item's parent.

Generally, if the item acts on the key event then it should be accepted so that ancestor items do not also respond to the same event.

count : int

This property holds the number of keys involved in this event. If KeyEvent::text is not empty, this is simply the length of the string.

isAutoRepeat : bool

This property holds whether this event comes from an auto-repeating key.

key : int

This property holds 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 property for this purpose.

值为 0 或 Qt.Key_Unknown 意味着事件不是已知按键的结果；例如，它可能是合成序列、键盘宏、或由于键事件压缩的结果。

modifiers : int

This property holds the keyboard modifier flags that existed immediately before the event occurred.

It contains a bitwise combination of:

• Qt.NoModifier - No modifier key is pressed.
• Qt.ShiftModifier - A Shift key on the keyboard is pressed.
• Qt.ControlModifier - A Ctrl key on the keyboard is pressed.
• Qt.AltModifier - An Alt key on the keyboard is pressed.
• Qt.MetaModifier - A Meta key on the keyboard is pressed.
• Qt.KeypadModifier - A keypad button is pressed.
• Qt.GroupSwitchModifier - X11 only. A Mode_switch key on the keyboard is pressed.

For example, to react to a Shift key + Enter key combination:

Item {
    focus: true
    Keys.onPressed: {
        if ((event.key == Qt.Key_Enter) && (event.modifiers & Qt.ShiftModifier))
            doSomething();
    }
}
										

nativeScanCode : quint32

This property contains the native scan code of the key that was pressed. It is passed through from QKeyEvent unchanged.

另请参阅 QKeyEvent::nativeScanCode() .

text : string

This property holds the Unicode text that the 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

方法文档编制

bool matches ( StandardKey key )

返回 true 若键事件匹配给定标准 key ；否则返回 false .

Item {
    focus: true
    Keys.onPressed: {
        if (event.matches(StandardKey.Undo))
            myModel.undo();
        else if (event.matches(StandardKey.Redo))
            myModel.redo();
    }
}
													

This QML method was introduced in Qt 5.2.

另请参阅 QKeySequence::StandardKey .