qtwidgets

Almost every QtWidgets class can have parent. And usually it's optional to set parent at object initialization. For example,If I create a class that inherits QWidget class, I will do the following on the constructor: Widget::Widget(QWidget* parent): QWidget(parent) { hbox = new QHBoxLayout(this); yes_button = new QPushButton("&Yes"); no_button = new QPushButton("&No", this); cancel_button = new QPushButton("&Cancel", hbox); } I can set or not set parent. I can set cancel_button to be a child of hbox . I can too set cancel_button to be a child of yes_button , but I think it's a bad thing to do.

hi I have a problem with updating ui by a thread. code works correctly but the problem is when I want to move my window as you know in that moment ui thread will stop updating. and my thread sends values to stopped thread that causes error. I don't know how to fix this. here is my thread code header: #ifndef READERTHREAD_H #define READERTHREAD_H #include <QtSerialPort/QSerialPort> #include <QtSerialPort/QSerialPortInfo> #include <QThread> class readerThread : public QThread { Q_OBJECT public: explicit readerThread(QObject *parent = 0); void run(); bool stop = false; QByteArray port_input;

I'd like to make my QRubberband instance user resizeable. I've seen this question here but there isn't a solution. The use case is that the user can drag out a selection marquee over a photo and then make fine adjustments by dragging on the QRubberband margins to change geometry, or reposition existing geometry by dragging the selection. I have the repositioning implemented but I am wondering about resize handles for changing the geometry of the QRubberband. Is it possible to use QSizeGrip here? Barring that, is there a standard way of checking for mouse-within-margin type events within Qt or

I just installed the Qt 5.1.1 for Windows 32-bit (MinGW 4.8, OpenGL) and tried to add it to my cmake. But CMake just does not want to find it and i dont know why. What am i missing? Do i need to set an environment variable or something? Here is my cmake : cmake_minimum_required( VERSION 2.8.11 ) PROJECT(Blemmer) # Find includes in corresponding build directories set(CMAKE_INCLUDE_CURRENT_DIR ON) # Instruct CMake to run moc automatically when needed. set(CMAKE_AUTOMOC ON) # Detect and add SFML set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/Modules" ${CMAKE_MODULE_PATH}) set( CMAKE_RUNTIME

I need a QTabWidget with icons only: How can I hide the label text of a tab in Qt? I cannot set the text to an empty string ( "" ), as I am using docked widgets ( QDockWidget ) and the label text is set automatically (and I need it if the widget is floating). But in tabbed mode I just want to display the icons (of the tabs). Possible approaches: Font size to 0? I need to create my own bar class and override the paint event as here Anything easier / cleaner? --- Edit --- Ok, the "set window title to empty string, and reset it the original text" approach works. I am using the topLevelChanged