KeyEvent QML Type

Provides information about a key event. 更多...

import 語句： import QtQuick

所有成員列錶，包括繼承成員

特性

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

方法

bool matches (StandardKey matchKey )

詳細描述

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

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

特性文檔編製

accepted : bool

設置 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 [read-only]

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 [read-only]

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

key : int [read-only]

This property holds the code of the key that was pressed or released.

見 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.

值為 0 或 Qt.Key_Unknown 意味著事件不是已知按鍵的結果；例如，它可能是閤成序列、鍵盤宏、或由於鍵事件壓縮的結果。

modifiers : int [read-only]

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

It contains a bitwise combination of numeric values (the same as in Qt::KeyboardModifier ):

常量	描述
`Qt.NoModifier`	未按下修飾符鍵。
`Qt.ShiftModifier`	}A Shift key on the keyboard is pressed.
`Qt.ControlModifier`	按下鍵盤 Ctrl 鍵。
`Qt.AltModifier`	按下鍵盤 Alt 鍵。
`Qt.MetaModifier`	按下鍵盤 Meta 鍵。
`Qt.KeypadModifier`	按下 Keypad (小鍵盤) 按鈕。
`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: (event)=> {
        if ((event.key == Qt.Key_Enter) && (event.modifiers & Qt.ShiftModifier))
            doSomething();
    }
}

nativeScanCode : quint32 [read-only]

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

另請參閱 QKeyEvent::nativeScanCode ().

text : string [read-only]

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

方法文檔編製

bool 匹配 ( StandardKey matchKey )

返迴 true 若鍵事件匹配給定標準 matchKey ；否則返迴 false .

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

另請參閱 QKeySequence::StandardKey .