qtquick2

问题 The following piece of code generates a white rectangle containing a red rectangle and a grey rectangle. Every rectangle has an associated MouseArea. The grey rectangle becomes blue when the mouse is clicked inside it. The red rectangle prints a console message when the mouse cursor enters inside it and another message when the released signal is emitted. I would like to: press and hold the mouse button inside the grey rectangle (becoming blue) move the cursor outside the grey/blue rectangle

问题 I have a custom Footer Component which I would like to reuse in different place in my QML App: Rectangle { color: "gold" height: 50 anchors { bottom: parent.bottom left: parent.left right: parent.right } RowLayout { anchors.fill: parent anchors.margins: 10 Button { text: "quit" } } } The use of this is easy: Window { visible: true Footer { } } But now I would like to add a "ButtonA" to the RowLayout of my Footer in one view and a "ButtonB" in another view. How can I achieve that? 回答1: See

问题 We're building a Qt Quick app, that must be able to save a file under a given name . In the FileDialog component you can only set a directory. This is not very user-friendly, since you don't want to type in a filename by hand every time you download a file. So far we tried different things FileDialog from QtQuick.Dialogs: filename cannot be set Native dialog via QPlatformFileDialogHelper (naughty private c++ hack): filename cannot be set on Linux (Gnome) Native dialog via static QFileDialog:

问题 I need to lock the screen to a specific orientation for an android app that I'm making. is there a way to do that in QML? Google didn't get me any answers. I am using Qt 5.2. 回答1: You can basically use the Screen.orientation property for reading only. See the following example for details: http://qt-project.org/doc/qt-5/qtquick-window-screeninfo-qml.html The proper way as of today is to use the Android manifest file for this as done by the Qt Android developer at Digia for his QtHangMan game

问题 I have a SQLite 3 database with 4 columns and QML code with TableView that displays it: TableView { id: table ... TableViewColumn { role: "name" width: 275 } TableViewColumn { role: "surname" width: 300 } TableViewColumn { role: "phone" width: 575 } TableViewColumn { role: "ip_address" width: 525 } model: abonents } It works fine, but I need to display the first two roles, name and surname , as a unique column in TableView . Here is the code for my model and the main . abonentstable.h:

问题 From C++ (Qt): int main(int argc, char *argv[]) { QApplication app(argc, argv); /* * I have omitted the code about connection with the database and all for ease of * viewing the code. */ // My own function for filling in the data in the `QSqlQueryModel` QSqlQueryModel* model = new QSqlQueryModel; QString binid = "B1"; QString query = "SELECT t1.BinId, t1.PartitionId, t2.UnitId, t2.ItemCount FROM Bin_Partitions AS t1 " "INNER JOIN Partition_Units AS t2 ON t1.PartitionId = t2.PartitionId "

问题 I just made a shocking discovery - when deploying QML applications, all the "stock" QML components used in the project are deployed as bare QML files, directly visible in the file system, they are not even tucked away in the application qrc binary as user QML files are. Meaning that anyone can open those human readable files, and write whatever code he needs executed. Also, it is possible to do a fair amount of introspection on QObject derived types, even from QML, you can crawl down the

问题 I have C++ class inherited from QAbstractTableModel with next functions overriden: virtual QHash<int, QByteArray> roleNames() const noexcept override; virtual Qt::ItemFlags flags(const QModelIndex& index) const noexcept override; virtual int rowCount(const QModelIndex& parent = QModelIndex()) const noexcept override; virtual int columnCount(const QModelIndex& parent = QModelIndex()) const noexcept override; virtual QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const

问题 What I would like to do is use the below enum in c++: class MyClass : public QQuickItem { Q_OBJECT Q_PROPERTY(MyEnum enumValue READ getEnumValue) public: enum MyEnum{ MyEnumElement = 0 }; Q_ENUM(MyEnum) slots: MyEnum getEnumValue(){ return enumValue; } private: MyEnum enumValue = MyEnumElement; }; In such a way in QML: MyClass { id: myClass } Text { text: "enumValue is: " + myClass.enumValue } That would result in enumValue is MyEnumElement instead of enumValue is 0 which is the case now. The

问题 I want to implement a sortable TableView with custom roles with Qt 5.1. But I don't know what to do more to make it sorted when user clicked on header. in my Qt .pro file, I added: !android: !ios: !blackberry: qtHaveModule(widgets): QT += widgets in main.cpp, I used QtWidgets/QApplication as global app instance, and used qmlRegisterType for my new model class(see below): qmlRegisterType<PositionModel>("MyDataModule", 1, 0, "PositionModel"); PositionModel is declared following: class