Before to draw line on a qwidget, override the paintEventFunction: virtual void paintEvent(QPaintEvent* p) override; implement the function: void DrawApplication::paintEvent(QPaintEvent*…
QCombobox has 8 signals. void activated(int index) void activated(const QString &text) void currentIndexChanged(int index) void currentIndexChanged(const QString &text) void currentTextChanged(const…
For get key events in event filter, this function must be called in class overrided event filter function before: this->installEventFilter(this);…
For get key events in event filter, this function must be called in class overrided event filter function before: this->installEventFilter(this);…
Mouse events are signals came from qobject when the user send an event by mouse. Forex: click, move, press. vb.…
Signals and slots are used to connect between an event from gui and a function. In other words, you can…
After to install event filter, we can get first mouseMoveEvent. My example is moving a QLabel in a QWidget by…
If you want to get mouseMove event without mousePress, you must call this function on class you override eventFilter before:…
After the install events with this function: installEventFilter(this); we can get the mouse press event like this example: bool ExampleApplication::eventFilter(QObject…
You can get mouse buttons like this example: bool ExampleApplication::eventFilter(QObject *object, QEvent *ev) { if (ev->type() == QEvent::MouseButtonPress) { QMouseEvent*…