內容

• 特性
• 詳細描述

KeyEvent QML Element

The KeyEvent object provides information about a key event. 更多...

Since:

Qt 4.7

• 所有成員列錶，包括繼承成員

特性

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

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: { 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

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.

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() function (returning the Unicode text the key generated) 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

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.

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();
    }
}
										

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