qt

问题 I have 3 QGraphicsView and 1 QOpenGLWidget laid out in QGridLayout in the center surrounded by other widgets on all 3 sides as shown in the pic below: All my widgets can be resized using QSplitter around them. As shown in the pic below: What do i want: QGraphicsView should always maintain a fixed size equivalent to image size. On resizing using QSplitter the view should resize based on the aspect ratio of the image but not the image itself as we can compare in the pics. The height and width

问题 I have an application that opens a QDialog for some flow, and when it is closed, the QMainWindow is opened. In the QDialog I create some objects that I'd like to pass as a pointer (or some other way) to the QMainWindow. For example I create a SysTray object that needs to change its state from the QMainWindow. What is the best way? Singletons? update . after implementing the sulotion another question was rises , does the QDialog is cleaned from memory that means , invoked its destructor ? i

问题 I want to add a new line to my QString . I tried to use \n , but I am receiving an error of "Expected Expression". An example of my code can be found below: if (ui->lineEdit_Company_Name->text().isEmpty()) ErrorLog = ErrorLog + "Company Name is empty", \r\n; if(ui->lineEdit_Company_Owner->text().isEmpty()) ErrorLog = ErrorLog + "Company Owner is empty", \r\n; 回答1: You need to use operator+, push_back, append or some other means for appending when using std::string , QString and the like.

问题 I want to add a new line to my QString . I tried to use \n , but I am receiving an error of "Expected Expression". An example of my code can be found below: if (ui->lineEdit_Company_Name->text().isEmpty()) ErrorLog = ErrorLog + "Company Name is empty", \r\n; if(ui->lineEdit_Company_Owner->text().isEmpty()) ErrorLog = ErrorLog + "Company Owner is empty", \r\n; 回答1: You need to use operator+, push_back, append or some other means for appending when using std::string , QString and the like.

问题 I want to add a new line to my QString . I tried to use \n , but I am receiving an error of "Expected Expression". An example of my code can be found below: if (ui->lineEdit_Company_Name->text().isEmpty()) ErrorLog = ErrorLog + "Company Name is empty", \r\n; if(ui->lineEdit_Company_Owner->text().isEmpty()) ErrorLog = ErrorLog + "Company Owner is empty", \r\n; 回答1: You need to use operator+, push_back, append or some other means for appending when using std::string , QString and the like.

问题 I want to add a new line to my QString . I tried to use \n , but I am receiving an error of "Expected Expression". An example of my code can be found below: if (ui->lineEdit_Company_Name->text().isEmpty()) ErrorLog = ErrorLog + "Company Name is empty", \r\n; if(ui->lineEdit_Company_Owner->text().isEmpty()) ErrorLog = ErrorLog + "Company Owner is empty", \r\n; 回答1: You need to use operator+, push_back, append or some other means for appending when using std::string , QString and the like.

问题 Unable to build Qt examples . Getting error while building in windows E:\android-ndk-r20-windows-x86_64\android-ndk-r20/toolchains/aarch64-linux- android-4.9/prebuilt/windows-x86_64/lib/gcc/aarch64-linux- android/4.9.x/../../../../aarch64-linux-android/bin\ld: cannot find -lc++ clang++: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [libanalogclock.so] Error 1 Qt SDK and NDK configuration Qt version 回答1: The error: cannot find -lc++ using ndk r20 can be

问题 [Update on 19 aug 2019 about workaround of this bug] environements: System: Windows 7 (reproduced on windows 10 PC on execution too) QT version: 5.11.2 as well as 5.13 compilation kit: Qt 5.11.3 MinGw 32bits ( mingw53_32 ) I encounter an issue with QDialog in Qt app. it's easy to reproduce, with multiple monitors(eg. 2 screens), you launch your application, then you move your main windows from one monitor to another one, then you click on the button of app to show a child dialog, then it this

问题 [Update on 19 aug 2019 about workaround of this bug] environements: System: Windows 7 (reproduced on windows 10 PC on execution too) QT version: 5.11.2 as well as 5.13 compilation kit: Qt 5.11.3 MinGw 32bits ( mingw53_32 ) I encounter an issue with QDialog in Qt app. it's easy to reproduce, with multiple monitors(eg. 2 screens), you launch your application, then you move your main windows from one monitor to another one, then you click on the button of app to show a child dialog, then it this

问题 [Update on 19 aug 2019 about workaround of this bug] environements: System: Windows 7 (reproduced on windows 10 PC on execution too) QT version: 5.11.2 as well as 5.13 compilation kit: Qt 5.11.3 MinGw 32bits ( mingw53_32 ) I encounter an issue with QDialog in Qt app. it's easy to reproduce, with multiple monitors(eg. 2 screens), you launch your application, then you move your main windows from one monitor to another one, then you click on the button of app to show a child dialog, then it this