Qt 如何初始化QML单例?
我有一个简单的测试项目来演示这个问题 我的标签定义为:Qt 如何初始化QML单例?,qt,qml,Qt,Qml,我有一个简单的测试项目来演示这个问题 我的标签定义为: Label // #1 { text: "Pack my box with five dozen liquor jugs -- DEFAULT" } 应使用qtquickcontrols2.conf中定义的默认字体(Art Brewery)显示,但不是 但是,如果添加标签: Label // #2 { font.family: Fonts.robotoBo
Label // #1
{
text: "Pack my box with five dozen liquor jugs -- DEFAULT"
}
应使用qtquickcontrols2.conf中定义的默认字体(Art Brewery)显示,但不是
但是,如果添加标签:
Label // #2
{
font.family: Fonts.robotoBold.name
text: "Pack my box with five dozen liquor jugs -- Roboto Bold"
}
然后,标签#1将使用Art Brewery字体绘制
发生的情况是,除非至少有一个引用,否则不会初始化字体单例
我的问题是:如何初始化singleton
我尝试过以下方法:
qmlRegisterSingletonType( QUrl( "file:///Users/jamesh/depot_qt/questions/font_test/assets/Fonts/Fonts.qml"), "Font", 1, 0, "Font" );
在我的main.cpp中,但它不起作用
我的目录结构如下所示:
$ tree font_test
font_test
├── README.md
├── assets
│ └── Fonts
│ ├── Art\ Brewery.ttf
│ ├── Fonts.qml
│ ├── Roboto-Bold.ttf
│ ├── Roboto-BoldItalic.ttf
│ ├── Roboto-Light.ttf
│ ├── Roboto-LightItalic.ttf
│ ├── Roboto-Medium.ttf
│ ├── Roboto-MediumItalic.ttf
│ ├── Roboto-Regular.ttf
│ ├── Roboto-RegularItalic.ttf
│ ├── RobotoMono-Bold.ttf
│ ├── RobotoMono-BoldItalic.ttf
│ ├── RobotoMono-Light.ttf
│ ├── RobotoMono-LightItalic.ttf
│ ├── RobotoMono-Medium.ttf
│ ├── RobotoMono-MediumItalic.ttf
│ ├── RobotoMono-Regular.ttf
│ ├── RobotoMono-RegularItalic.ttf
│ └── qmldir
├── font_test.pro
├── font_test.pro.user
├── main.cpp
├── main.qml
├── qml.qrc
└── qtquickcontrols2.conf
我的是
我的名字是:
我的档案是:
我的资产/字体文件夹的内部是:
singleton Fonts 1.0 Fonts.qml
我的是
我确信有一个更好的解决方案,但有一件事是找到一种方法来引用singleton,这样就可以加载所有内容 我将main.qml修改为:
...
...
...
title: qsTr("Hello World")
property var fontReference: Fonts.objectName
Column
...
...
...
我不关心fontReference属性。我只需要一些方法来初始化字体。我假设在引擎实例中创建了C++方法,在Me.CPP中创建引擎实例后,它将完成同样的事情,并且可以被认为是这种情况下的最佳实践。您正在讨论这个函数:该函数似乎适用于C++中定义的一个单独的函数。如果有一种方法可以在我的情况下使用它,我将有兴趣了解它是什么。很好的一点,我认为您可能会与此其他功能结合在一起:
<RCC>
<qresource prefix="/">
<file>main.qml</file>
<file>qtquickcontrols2.conf</file>
</qresource>
<qresource prefix="/Fonts">
<file alias="qmldir">assets/Fonts/qmldir</file>
<file alias="Fonts.qml">assets/Fonts/Fonts.qml</file>
<file alias="Art Brewery.ttf">assets/Fonts/Art Brewery.ttf</file>
<file alias="Roboto-Bold.ttf">assets/Fonts/Roboto-Bold.ttf</file>
<file alias="Roboto-BoldItalic.ttf">assets/Fonts/Roboto-BoldItalic.ttf</file>
<file alias="Roboto-Light.ttf">assets/Fonts/Roboto-Light.ttf</file>
<file alias="Roboto-LightItalic.ttf">assets/Fonts/Roboto-LightItalic.ttf</file>
<file alias="Roboto-Medium.ttf">assets/Fonts/Roboto-Medium.ttf</file>
<file alias="Roboto-MediumItalic.ttf">assets/Fonts/Roboto-MediumItalic.ttf</file>
<file alias="Roboto-Regular.ttf">assets/Fonts/Roboto-Regular.ttf</file>
<file alias="Roboto-RegularItalic.ttf">assets/Fonts/Roboto-RegularItalic.ttf</file>
<file alias="RobotoMono-Bold.ttf">assets/Fonts/RobotoMono-Bold.ttf</file>
<file alias="RobotoMono-BoldItalic.ttf">assets/Fonts/RobotoMono-BoldItalic.ttf</file>
<file alias="RobotoMono-Light.ttf">assets/Fonts/RobotoMono-Light.ttf</file>
<file alias="RobotoMono-LightItalic.ttf">assets/Fonts/RobotoMono-LightItalic.ttf</file>
<file alias="RobotoMono-Medium.ttf">assets/Fonts/RobotoMono-Medium.ttf</file>
<file alias="RobotoMono-MediumItalic.ttf">assets/Fonts/RobotoMono-MediumItalic.ttf</file>
<file alias="RobotoMono-Regular.ttf">assets/Fonts/RobotoMono-Regular.ttf</file>
<file alias="RobotoMono-RegularItalic.ttf">assets/Fonts/RobotoMono-RegularItalic.ttf</file>
</qresource>
</RCC>
QT += quick
CONFIG += c++11
# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
main.cpp
RESOURCES += qml.qrc
# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH = $$PWD/assets
# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
DISTFILES +=
pragma Singleton
import QtQuick 2.12
Item
{
readonly property FontLoader robotoBold: FontLoader { source: "qrc:/Fonts/Roboto-Bold.ttf" }
readonly property FontLoader robotoBoldItalic: FontLoader { source: "qrc:/Fonts/Roboto-BoldItalic.ttf" }
readonly property FontLoader robotoLight: FontLoader { source: "qrc:/Fonts/Roboto-Light.ttf" }
readonly property FontLoader robotoLightItalic: FontLoader { source: "qrc:/Fonts/Roboto-LightItalic.ttf" }
readonly property FontLoader robotoMedium: FontLoader { source: "qrc:/Fonts/Roboto-Medium.ttf" }
readonly property FontLoader robotoMediumItalic: FontLoader { source: "qrc:/Fonts/Roboto-MediumItalic.ttf" }
readonly property FontLoader robotoRegular: FontLoader { source: "qrc:/Fonts/Roboto-Regular.ttf" }
readonly property FontLoader robotoRegularItalic: FontLoader { source: "qrc:/Fonts/Roboto-RegularItalic.ttf" }
readonly property FontLoader robotoMonoBold: FontLoader { source: "qrc:/Fonts/RobotoMono-Bold.ttf" }
readonly property FontLoader robotoMonoBoldItalic: FontLoader { source: "qrc:/Fonts/RobotoMono-BoldItalic.ttf" }
readonly property FontLoader robotoMonoLight: FontLoader { source: "qrc:/Fonts/RobotoMono-Light.ttf" }
readonly property FontLoader robotoMonoLightItalic: FontLoader { source: "qrc:/Fonts/RobotoMono-LightItalic.ttf" }
readonly property FontLoader robotoMonoMedium: FontLoader { source: "qrc:/Fonts/RobotoMono-Medium.ttf" }
readonly property FontLoader robotoMonoMediumItalic: FontLoader { source: "qrc:/Fonts/RobotoMono-MediumItalic.ttf" }
readonly property FontLoader robotoMonoRegular: FontLoader { source: "qrc:/Fonts/RobotoMono-Regular.ttf" }
readonly property FontLoader robotoMonoRegularItalic: FontLoader { source: "qrc:/Fonts/RobotoMono-RegularItalic.ttf" }
readonly property FontLoader artBrewery: FontLoader { source: "qrc:/Fonts/Art Brewery.ttf" }
}
singleton Fonts 1.0 Fonts.qml
import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.12
import Fonts 1.0
//import "qrc:/Fonts/"
ApplicationWindow {
width: 640
height: 480
visible: true
title: qsTr("Hello World")
Column
{
spacing: 8
anchors.fill: parent
anchors.margins: 20
Label // #1
{
text: "Pack my box with five dozen liquor jugs -- DEFAULT"
}
// Label // #2
// {
// font.family: Fonts.robotoBold.name
// text: "Pack my box with five dozen liquor jugs -- Roboto Bold"
// }
// Label // #3
// {
// font.family: Fonts.robotoMonoRegular.name // Fonts.robotoRegular.name
// text: "Pack my box with five dozen liquor jugs -- Roboto Mono"
// }
// Label // #4
// {
// text: "Pack my box with five dozen liquor jugs -- Art Brewery"
// font.family: Fonts.artBrewery.name
// font.pixelSize: 36
// }
}
}
...
...
...
title: qsTr("Hello World")
property var fontReference: Fonts.objectName
Column
...
...
...