qt

问题 I've got some trouble with static members and methods in C++. This is the Class header: class Decoration { public: //Static Methods static void reloadList(); //Static Members static std::unordered_map<int, Decoration> decorationMapID; }; And in .cpp: void Decoration::reloadList() { sqlTable result = db->exec("SELECT id, name, description FROM decorations"); for(sqlRow r: result) { Decoration::decorationMapID.insert(std::pair<int,Decoration>(atoi(r[0].c_str()), Decoration(r[1], r[2], atoi(r[0]

问题 I've got some trouble with static members and methods in C++. This is the Class header: class Decoration { public: //Static Methods static void reloadList(); //Static Members static std::unordered_map<int, Decoration> decorationMapID; }; And in .cpp: void Decoration::reloadList() { sqlTable result = db->exec("SELECT id, name, description FROM decorations"); for(sqlRow r: result) { Decoration::decorationMapID.insert(std::pair<int,Decoration>(atoi(r[0].c_str()), Decoration(r[1], r[2], atoi(r[0]

问题 I have a realtime signal from a sensor. I need logic to implement a masking time once the signal is above a threshold. As shown below: Here the signal (in blue) crosses a threshold. And I need to mask for any checks for the threshold for a period (masking time). (In this way I can detect only the positive pulse , similarly, I have another check for negative pulse ) See the code below: static QTime time(QTime::currentTime()); // calculate two new data points: double key = time.elapsed()/1000.0

问题 I have a realtime signal from a sensor. I need logic to implement a masking time once the signal is above a threshold. As shown below: Here the signal (in blue) crosses a threshold. And I need to mask for any checks for the threshold for a period (masking time). (In this way I can detect only the positive pulse , similarly, I have another check for negative pulse ) See the code below: static QTime time(QTime::currentTime()); // calculate two new data points: double key = time.elapsed()/1000.0

问题 Here is a "hello world" button that display a window and button. I would like to do a cout or any other custom functionality when the button is clicked but I'm stuck. #include <QApplication> #include <QPushButton> #include <iostream> int main(int argc, char **argv){ // create app QApplication app (argc, argv); // create window QWidget window; window.setWindowTitle("MyWindow"); window.setFixedSize(600, 480); // create button QPushButton *button = new QPushButton(&window); button->setGeometry

问题 I am developing a device using VAR-SOM-MX7 developing in Yocto Sumo. I managed to add virtual keyboard into my QApplication but when the keyboard appeared, it overlaps the application. The textEdit field still getting the input from the virtual keyboard but just cannot show the textEdit field while typing. I have tried to: qputenv("QMLSCENE_DEVICE", QByteArray("softwarecontext")) CONFIG += disable-desktop In qml I changed the keyboard layout: keyboardBackground: Rectangle { color:

问题 I am developing a device using VAR-SOM-MX7 developing in Yocto Sumo. I managed to add virtual keyboard into my QApplication but when the keyboard appeared, it overlaps the application. The textEdit field still getting the input from the virtual keyboard but just cannot show the textEdit field while typing. I have tried to: qputenv("QMLSCENE_DEVICE", QByteArray("softwarecontext")) CONFIG += disable-desktop In qml I changed the keyboard layout: keyboardBackground: Rectangle { color:

问题 Im trying to convert a QImage that maked from ScreenShot to a QByteArray for sending via QTCPSocket. when i convert QImage to QByteArray and before sending it i try to deserialize and show it on label it cant ! what's my mistake? thx for helping. QByteArray ImClientShooter::toQByteArray(QImage &img) { QByteArray temp; QDataStream data(&temp, QIODevice::ReadWrite); data « img; return temp; } QByteArray goOn{toQByteArray(sampleQImage)}; //sampleQImage is a QImage Object lbl->setPixmap(QPixmap:

问题 How would I go about making a overlay widget with qt? I've considered using a QPaintEvent or a QGraphicsScene, but I want to be able to add widgets and for the widget to not occupy space in a layout, causing other widgets to shift when the popup appears. 回答1: I believe the best solution is to parent the so called overlay widget to the window or even have the overlay widget be in its own window. The first solution might be easier to do, but the overlay widget is bound to the inside of the

问题 My UI contains a Text field with horizontalAlignment: Text.AlignJustify maximumLineCount: 5 wrapMode: TextEdit.WordWrap elide: Text.ElideRight When the text does not fit, the last line should end with "... MORE" where "MORE" should be focusable. This will probably be a separate Text field where the visibility is controlled by whether or not the text is elided. But how can I detect when a Text gets elided? 回答1: When a Text gets elided, it is truncated. Here's a simple example: Text { id: