内容

特性
信号
方法
详细描述
Submenus
Dynamically Generating Menu Items
可用性

Menu QML Type

A native menu. 更多...

import 语句：	import Qt.labs.platform 1.1
Since:	Qt 5.8
继承：	QtObject

特性

data : list<Object>
enabled : bool
font : font
项 : list<MenuItem>
menuBar : MenuBar
menuItem : MenuItem
minimumWidth : int
parentMenu : Menu
systemTrayIcon : SystemTrayIcon
title : string
type : enumeration
visible : bool

信号

aboutToHide ()
aboutToShow ()

方法

void addItem (MenuItem item )
void addMenu (Menu submenu )
void clear ()
void close ()
void insertItem (int index , MenuItem item )
void insertMenu (int index , Menu submenu )
void open (MenuItem item )
void open (Item target , MenuItem item )
void removeItem (MenuItem item )
void removeMenu (Menu submenu )

详细描述

The Menu type provides a QML API for native platform menu popups.

Menu can be used in a MenuBar , or as a stand-alone context menu. The following example shows how to open a context menu on right mouse click:

MouseArea {
    anchors.fill: parent
    acceptedButtons: Qt.RightButton
    onClicked: zoomMenu.open()
}
Menu {
    id: zoomMenu
    MenuItem {
        text: qsTr("Zoom In")
        shortcut: StandardKey.ZoomIn
        onTriggered: zoomIn()
    }
    MenuItem {
        text: qsTr("Zoom Out")
        shortcut: StandardKey.ZoomOut
        onTriggered: zoomOut()
    }
}

Submenus

To create submenus, declare a Menu as a child of another Menu:

Menu {
    title: qsTr("Edit")
    Menu {
        title: qsTr("Advanced")
        MenuItem {
            text: qsTr("Auto-indent Selection")
            onTriggered: autoIndentSelection()
        }
        MenuItem {
            text: qsTr("Rewrap Paragraph")
            onTriggered: rewrapParagraph()
        }
    }
}

It is possible to dynamically generate menu items. One of the easiest ways to do so is with Instantiator . For example, to implement a "Recent Files" submenu, where the items are based on a list of files stored in settings, the following code could be used:

Menu {
    title: qsTr("File")
    Menu {
        id: recentFilesSubMenu
        title: qsTr("Recent Files")
        enabled: recentFilesInstantiator.count > 0
        Instantiator {
            id: recentFilesInstantiator
            model: settings.recentFiles
            delegate: MenuItem {
                text: settings.displayableFilePath(modelData)
                onTriggered: loadFile(modelData)
            }
            onObjectAdded: recentFilesSubMenu.insertItem(index, object)
            onObjectRemoved: recentFilesSubMenu.removeItem(object)
        }
        MenuSeparator {}
        MenuItem {
            text: qsTr("Clear Recent Files")
            onTriggered: settings.clearRecentFiles()
        }
    }
}

可用性

A native platform menu is currently available on the following platforms:

macOS
iOS
Android
Linux (only available as a stand-alone context menu when running with the GTK+ platform theme)

The Qt Labs Platform module uses Qt Widgets as a fallback on platforms that do not have a native implementation available. Therefore, applications that use types from the Qt Labs Platform module should link to QtWidgets and use QApplication 而不是 QGuiApplication .

要链接到 QtWidgets library, add the following to your qmake project file:

QT += widgets

Create an instance of QApplication in main() :

#include <QApplication>
#include <QQmlApplicationEngine>
int main(int argc, char *argv[])
{
    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QApplication app(argc, argv);
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    return app.exec();
}

注意： Types in Qt.labs modules are not guaranteed to remain compatible in future versions.

另请参阅 MenuItem , MenuSeparator ，和 MenuBar .

特性文档编制

[default] data : list < 对象 >

This default property holds the list of all objects declared as children of the menu. The data property includes objects that are not MenuItem 实例，譬如 Timer and QtObject .

另请参阅 项 .

enabled : bool

This property holds whether the menu is enabled. The default value is true .

font : font

This property holds the menu's font.

另请参阅 text .

项 : list < MenuItem >

This property holds the list of items in the menu.

[read-only] menuBar : MenuBar

This property holds the menubar that the menu belongs to, or null if the menu is not in a menubar.

[read-only] menuItem : MenuItem

This property holds the item that presents the menu (in a parent menu).

minimumWidth : int

This property holds the minimum width of the menu. The default value is -1 (no minimum width).

[read-only] parentMenu : Menu

This property holds the parent menu that the menu belongs to, or null if the menu is not a sub-menu.

[read-only] systemTrayIcon : SystemTrayIcon

This property holds the system tray icon that the menu belongs to, or null if the menu is not in a system tray icon.

title : string

This property holds the menu's title.

type : enumeration

This property holds the type of the menu.

Available values:

常量	描述
`Menu.DefaultMenu`	A normal menu (default).
`Menu.EditMenu`	An edit menu with pre-populated cut, copy and paste items.

visible : bool

This property holds whether the menu is visible. The default value is true .

信号文档编制

aboutToHide ()

This signal is emitted when the menu is about to be hidden from the user.

aboutToShow ()

This signal is emitted when the menu is about to be shown to the user.

方法文档编制

void addItem ( MenuItem item )

添加 item to the end of the menu.

void addMenu ( Menu submenu )

添加 submenu to the end of the menu.

void clear ()

Removes all items from the menu.

void close ()

Closes the menu.

void insertItem ( int index , MenuItem item )

Inserts an item at the specified index in the menu.

void insertMenu ( int index , Menu submenu )

插入 submenu at the specified index in the menu.

void open ( MenuItem item )

Opens the menu at the current mouse position, optionally aligned to a menu item .

void open ( Item target , MenuItem item )

Opens the menu at the specified target item, optionally aligned to a menu item .

void removeItem ( MenuItem item )

Removes an item from the menu.

void removeMenu ( Menu submenu )

Removes a submenu from the menu.

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