Qt Quick App的兩種啟動模式

QQmlApplicationEngine搭配Window

QQuickView搭配Item

兩者不同之處在於：

使用QQuickView顯示QML文檔，對窗口的控制權（比如設置窗口標題、Icon、窗口的最小尺寸等）在C++代碼；而使用QQmlApplicationEngine加載以Window為根對象的QML文檔，QML文檔則擁有窗口的完整控制權，可以直接設置標題、窗口尺寸等屬性。

1、QQmlApplicationEngine搭配Window啟動方式：

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();
    
    
    
            
}
   
   
   
           

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();
    
    
    
            
 }
    
    
    
            
 }
    
    
    
            
}
   
   
   
           

窗口

2、QQuickView搭配Item

main.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();
    
    
    
            
}
   
   
   
           

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;
    
    
    
            
}
   
   
   
           

來自為知筆記(Wiz)