qtquick2

问题 How can I, from the C++, add some more Rectangle s dynamically to the one with id root ? For example, two more Rectangle s colored red and green ? main.qml: Rectangle { id: root } Typical QML objects to add under 'root': Rectangle { color: "red"; width: 200; height: 200 } Rectangle { color: "green"; width: 200; height: 200 } Qt Creator generated main.cpp : int main(int argc, char *argv[]) { QGuiApplication app(argc, argv); QtQuick2ApplicationViewer viewer; viewer.setMainQmlFile(QStringLiteral

问题 I want to use qmlRegiterType() in registered class itself. I tried to use method from this topic but whenever I try to run application in debug mode it crashes the application with error read access violation at 0x0 Crashes on macro QML_GETTYPENAMES inside qqml.h (235 line). TestClass.h : class RegisterQmlTest : public QObject { Q_OBJECT public: explicit RegisterQmlTest(QObject *parent = 0); }; TestClass.cpp : QML_REGISTER(RegisterQmlTest); RegisterQmlTest::RegisterQmlTest(QObject *parent) :

问题 How to dynamically add components in QML? I refered this link to add a component(Rectangle component) into main.qml window upon a button click in same window. 'Ubuntu.Components' is not installed in my qt. I don't know javascript. "componentCreation.js"is refered here. What does it means? i am beginner in qml . i need to know is there a way to load qml comonents dynamically by using qml only. 回答1: main.qml import QtQuick 2.6 import QtQuick.Window 2.2 import QtQuick.Controls 1.4 Window { id

问题 I am a newbie in QML and I made a "accordion" item. I modified a not complete QML project for that. For that, I use PanelItems : Item { default property var contentItem: null property string title: "panel" id: root Layout.fillWidth: true height: 30 Layout.fillHeight: current property bool current: false ColumnLayout { anchors.fill: parent spacing: 0 Rectangle { Drag.active: dragArea.drag.active id: bar Layout.fillWidth: true height: 30 color: root.current ? "#81BEF7" : "#CEECF5" Text {

问题 What I want is a way to create a Qt Quick item drawn using custom OpenGL code. I seem to have found 2 ways: Subclass QQuickFramebufferItem and write my OpenGL code in C++ Create a Canvas3D item in QML and draw to it from Javascript Do these two ways really have the same purpose, with the main difference that they're used from different languages? 来源： https://stackoverflow.com/questions/39596473/is-qquickframebufferitem-the-c-equivalent-of-qmls-canvas-3d

问题 I have a need for a simple drop-down box containing the numbers 1 through 25 inclusive. If I set the model up as a simple 25 , I get the values 0 through 24 inclusive. I know I can have a more complicated list model but it seems rather silly to construct a massive array of values when they should be able to be calculated on the fly. From what I read, it should be a simple matter to create a delegate for setting the display values but, with the QML: ComboBox { width: 100 model: 25 delegate:

问题 How can I animate scrolling in a QML ScrollView? I've tried a Behavior on the contentItem.contentY , but that isn't working. 回答1: With Qt Quick Controls 1 You just have to animate the value changes on the property flickableItem.contentY . A quick example: Item { anchors.fill: parent ColumnLayout { anchors.fill: parent Button { id: btn onClicked: scroll.scrollTo(scroll.flickableItem.contentY + 100) } ScrollView { id: scroll function scrollTo(y) { scrollAnimation.to = y scrollAnimation.start()

问题 In TreeView , selecting a row by clicking it. But I want to focus the row in TreeView by indicating the row QModelIndex and roleName . I found similar function in ListView : positionViewAtIndex(int index, PositionMode mode) How to do this in TreeView ? 回答1: Try to use hidden variable __listView. __listView.positionViewAtIndex(row, mode) 来源： https://stackoverflow.com/questions/46441998/how-to-scroll-to-certain-row-in-qml-treeview

问题 I render my 3d model under qml controls using QQuickView::beforeRendering event. I want to do my mouse events handling in C++ if user clicks outside any of qml controls/ How can I found out in QQuickView::mousePressEvent that mouse is pressed outside qml controls? 回答1: I think it's easier to do it with a custom QQuickItem , because doing it with a custom QQuickView apparently means that you get the events before they reach any of the items. Here's an example: #include <QtQuick> class MyItem :

问题 I'm wondering why for Item this works: Item { id: root width: 640 height: 480 MouseArea { anchors.fill: (root or parent. It doesn't matter) onClicked: console.log("clicked") } } But for Window it doesn't. Only anchoring by parent will work, but for anchoring by id it will fail. 回答1: According to the documentation, anchors.fill requires the argument either to be or to identify an Item -derived object. From here you can follow the inheritance chain of Window and see that it is not actually an