qml

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 I am currently developing a video player. The GUI as the topmost layer is written in QML. It should be transparent to lower layers. It contains control elements, some Lists etc., It's displayed using a QDeclarativeView . Description QDeclarativeView *upperLayer = new QDeclarativeView(this); upperLayer->setSource(QUrl("/home/projects/QtVideo/qml/videoControl.qml")); upperLayer->setStyleSheet(QString("background: transparent"); upperLayer->setResizeMode(QDeclarativeView::SizeRootObjectToView);

问题 I have a QML-based app that loads a main.qml file from the file system like this: myEngine->load("main.qml"); This works fine, but I'd like to "reload" the engine in case the main.qml was replaced with a newer version. What I tried so far was calling load() again, assuming that the engine will automatically reset itself like in other Qt classes. Unfortunately this is not the case. If I call the method again, another window will appear with the contents of the updated qml file, while the

问题 My main objective is to receive signals from singleton objects while defining QML component in *.qml file. Let's say I defined a singleton object in C++ code like this: class MySingleton : public QObject { Q_OBJECT Q_PROPERTY(QString value READ value WRITE setValue NOTIFY valueChanged) typedef QObject Base; public: static MySingleton* instance(); const QString& value() const; void setValue(const QString& value); signals: void valueChanged(); private: MySingleton(QObject* parent = nullptr);

问题 I just want to connect a cpp signal to a qml slot and tried different ways, but it always results in the same QML-Error at runtime: Cannot assign to non-existent property "onProcessed" ! Why? This is my Cpp Object: #include <QObject> class ImageProcessor : public QObject { Q_OBJECT public: explicit ImageProcessor(QObject *parent = 0); signals: void Processed(const QString str); public slots: void processImage(const QString& image); }; ImageProcessor::ImageProcessor(QObject *parent) : QObject

问题 I am on learning to QML with Qt and get some trouble with passing enum class to qml . When I use signal with int parameters - it's all right and code work perfectly. But, and here the trouble , if I use signal with some enum class parameters I have undefined values in qml signal handler. I tried to register enum class through qmlRegisterType but it's not working. I will be grateful for the help. Here the code: Some Helper class class Helper : public QObject { Q_OBJECT Q_ENUMS(Requester) Q

问题 According to this article, there are two main methods for rendering raw OpenGL into an application whose UI is otherwise managed by QtQuick's scene graph. In short, they are (according to my understanding): Calling raw OpenGL methods in hand-written code that is hooked into the scene graph's render loop through some APIs exposed by QtQuick. Rendering the raw OpenGL portion of your scene to a QQuickFramebufferObject, which is treated like a component in the scene graph and itself rendered as

问题 Let's say I have a ListView of clickable delegate components (or GridView or Repeater ). These delegate components need to emit a signal along with custom data when triggered that can be picked up by the parent of the ListView . How can this signal binding be achieved? e.g. The following code is my attempt but I don't know how to bind the trigger signal of the delegate component to the componentTriggered signal in the root item? Item { id: root anchors.fill: parent signal componentTriggered

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