qml

问题 The problem with my code below is that on US/UK keyboard layouts + is generated with shift + = , but when the user uses both the control and shift modifiers simultaneously, + is not generated. This has been tested on Mac. Keys.onPressed: { if (event.modifiers & Qt.ControlModifier) { if (event.key === Qt.Key_Minus) { zoom(false) event.accepted = true } else if (event.key === Qt.Key_Plus) { zoom(true) event.accepted = true } } } Since control + + and control + - are standard shortcuts for

问题 I need to Start immediately and stop then a QThread extended class from Qml File. Is there any solution for that? here is my class : class SerialManager : public QThread { Q_OBJECT public: CircularList<unsigned char> buffer_[2]; signals: void dataReady(short *value,int len,unsigned short sample); protected: void run(); }; 回答1: if you have SerialManager like this: class SerialManager : public QThread { Q_OBJECT public: CircularList<unsigned char> buffer_[2]; signals: void dataReady(short

问题 I'm developing a QML metronome. I used a timer with interval 60000/Beats per minute. However it isn't really accurate. How can I improve the accuracy. Should I use a Timer, or is there a better solution? 回答1: The fundamental issue with QTimer that it uses the Qt event loop for the timing. Unfortunately, it cannot be accurate enough, inherently. The latency for notifications and all that within the event loop is getting in the way. You would need to consider a timer that does not actually

问题 I want to connect a destroyed signal of C++ QObject from QML so I did this: Rectangle { id: root width: 128 height: 128 Button { anchors.centerIn: parent text: "Click me" onClicked: { qobj.Component.onDestruction.connect(function(){console.log("It destroy")}) // qobj is set from c++ qobj.destroy() // should output "It destroy" } } But nothing is printed when I destroy qobj . 回答1: In the general case, you can connect to signals emitted from a C++ object using a Connections element: Connections

问题 I am creating a program in Qt5.3 and Qtquick2.1. I am trying to capture back button press on android in my code using Keys.onReleased. But that event is not getting triggered. Also I have set the item focus to true. But still no success. Here is the code sample import QtQuick 2.1 import QtQuick.Controls 1.2 import QtQuick.Controls.Styles 1.2 import QtQuick.Layouts 1.1 import QtQuick.Window 2.1 Rectangle { id: main2 focus: true width: Screen.Width height: Screen.Height Keys.enabled: true Keys

问题 I am creating a program in Qt5.3 and Qtquick2.1. I am trying to capture back button press on android in my code using Keys.onReleased. But that event is not getting triggered. Also I have set the item focus to true. But still no success. Here is the code sample import QtQuick 2.1 import QtQuick.Controls 1.2 import QtQuick.Controls.Styles 1.2 import QtQuick.Layouts 1.1 import QtQuick.Window 2.1 Rectangle { id: main2 focus: true width: Screen.Width height: Screen.Height Keys.enabled: true Keys

问题 I'm using QT 5.9.1 working on Mac OS. My project is mobile App with C++ logic and QML UI Layer. All QML files are included into qml.qrc file, so in my .pro file I have RESOURCES += qml.qrc Inside qml.qrc there is a list of all resource files I use in Project, such as pictures, icons and QML files, in QT Creator it's displayed OK: As you can see some QML files are located in ROOT path of qml.qrc when other files are in subfolders , e.g. "qrc:/Elements/". So problem is that whenether I make

问题 I'm using QT 5.9.1 working on Mac OS. My project is mobile App with C++ logic and QML UI Layer. All QML files are included into qml.qrc file, so in my .pro file I have RESOURCES += qml.qrc Inside qml.qrc there is a list of all resource files I use in Project, such as pictures, icons and QML files, in QT Creator it's displayed OK: As you can see some QML files are located in ROOT path of qml.qrc when other files are in subfolders , e.g. "qrc:/Elements/". So problem is that whenether I make

问题 Is there a way to hide the language selection key from the virtual keyboard without use a custom layout? 回答1: I was able to hide the language key with a workaround: property var keyboardLayout: inputPanel.keyboard.layout function findChildByProperty(parent, propertyName, propertyValue, compareCb) { var obj = null if (parent === null) return null var children = parent.children for (var i = 0; i < children.length; i++) { obj = children[i] if (obj.hasOwnProperty(propertyName)) { if (compareCb !=

问题 I read the documentation about: focus property activeFocus property forceActiveFocus() method FocusScope object and keyboard focus in QtQuick but it is still not clear when should someone use forceActiveFocus() method over setting the focus property to true or vice versa. 回答1: As the documentation states: For very simple cases simply setting the focus property is sometimes sufficient. Such a simple case would be, if the Item which gets focus: true is not enclosed by a FocusScope that might