Qt Quick App的两种启动模式

QQmlApplicationEngine搭配WindowQQuickView搭配Item两者不同之处在于：使用QQuickView显示QML文档，对窗口的控制权（比如设置窗口标题、Icon、窗口的最小尺寸等）在C++代码；而使用QQmlApplicationEngine加载以Window为根对象的QML文档，QML文档则拥有窗口的完整控制权，可以直接设置标题、窗口尺寸等属性。1、QQmlApplicationEngine搭配Window启动方式：
main.c文件

int main(int argc, char *argv[])

{

QApplication app(argc, argv);

QQmlApplicationEngine engine;

engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

return app.exec();

}

[/code]main.qml文件

ApplicationWindow {

title: qsTr("Hello World")

width: 640

height: 480

visible: true

menuBar: MenuBar {

Menu {

title: qsTr("&File")

MenuItem {

text: qsTr("&Open")

onTriggered: messageDialog.show(qsTr("Open action triggered"));

}

MenuItem {

text: qsTr("E&xit")

onTriggered: Qt.quit();

}

}

}

MainForm {

anchors.fill: parent

button1.onClicked: messageDialog.show(qsTr("Button 1 pressed"))

button2.onClicked: messageDialog.show(qsTr("Button 2 pressed"))

button3.onClicked: messageDialog.show(qsTr("Button 3 pressed"))

}

MessageDialog {

id: messageDialog

title: qsTr("May I have your attention, please?")

function show(caption) {

messageDialog.text = caption;

messageDialog.open();

}

}

}

[/code]窗口


2、QQuickView搭配Itemmain.c文件

#include <QApplication>

#include <QQuickView>

#include <QGuiApplication>

#include <QQmlApplicationEngine>

int main(int argc, char *argv[])

{

QGuiApplication app(argc, argv);

QQuickView viewer;

viewer.setResizeMode(QQuickView::SizeRootObjectToView);

viewer.setSource(QUrl("qrc:///main.qml"));

viewer.show();

return app.exec();

}

[/code]main.qml文件

import QtQuick 2.4

import QtQuick.Controls 1.3

import QtQuick.Window 2.2

import QtQuick.Dialogs 1.2

Rectangle{

width: 320;

height: 240;

}

[/code]

来自为知笔记(Wiz)