QtQuick的两种启动模式

 

 

QQmlApplicationEngine搭配Window

QQuickView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

1. int main(int argc, char *argv[])
2. {
3. QApplication app(argc, argv);
5. QQmlApplicationEngine engine;
6. engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
8. return app.exec();
9. }

main.qml文件

1. ApplicationWindow {
2. title: qsTr("Hello World")
3. width: 640
4. height: 480
5. visible: true
7. menuBar: MenuBar {
8. Menu {
9. title: qsTr("&File")
10. MenuItem {
11. text: qsTr("&Open")
12. onTriggered: messageDialog.show(qsTr("Open action triggered"));
13. }
14. MenuItem {
15. text: qsTr("E&xit")
16. onTriggered: Qt.quit();
17. }
18. }
19. }
21. MainForm {
22. anchors.fill: parent
23. button1.onClicked: messageDialog.show(qsTr("Button 1 pressed"))
24. button2.onClicked: messageDialog.show(qsTr("Button 2 pressed"))
25. button3.onClicked: messageDialog.show(qsTr("Button 3 pressed"))
26. }
28. MessageDialog {
29. id: messageDialog
30. title: qsTr("May I have your attention, please?")
32. function show(caption) {
33. messageDialog.text = caption;
34. messageDialog.open();
35. }
36. }
37. }

窗口

2、QQuickView搭配Item

main.c文件

1. #include <QApplication>
2. #include <QQuickView>
3. #include <QGuiApplication>
4. #include <QQmlApplicationEngine>
6. int main(int argc, char *argv[])
7. {
8. QGuiApplication app(argc, argv);
9. QQuickView viewer;
10. viewer.setResizeMode(QQuickView::SizeRootObjectToView);
11. viewer.setSource(QUrl("qrc:///main.qml"));
12. viewer.show();
14. return app.exec();
15. }

main.qml文件

1. import QtQuick 2.4
2. import QtQuick.Controls 1.3
3. import QtQuick.Window 2.2
4. import QtQuick.Dialogs 1.2
6. Rectangle{
7. width: 320;
8. height: 240;
9. }