How to Use QPushButton/fa

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بررسی اجمالی با استفاده از QPushButton توسعه دهندگان می‌توانند دکمه‌ها را ایجاد و به کار گیری کنند. این کلاس به راحتی قابل استفاده و شخصی‌سازی است، بنابراین در میان پر استفاده‌ترین کلاس‌ها در Qt قرار دارد. به صورت کلی دکمه متن را نشان می‌دهد، اما همزمان می‌توان برای نمایش یک آیکون هم از آن استفاده کرد. QPushButton از QAbstractButton ارث‌بری شده است که به نوبه خود از کلاس QWidget هم ارث‌بری می‌کند. Signals(سیگنال‌ها) سیگنال‌های ارث برده شده از QAbstractButton void clicked ( bool checked = false ) void pressed () void released () void toggled ( bool checked ) سیگنال‌های ارث برده شده از QWidget void customContextMenuRequested ( const QPoint &pos ) سیگنال‌های ارث برده شده از QObject void destroyed ( QObject * obj = 0 ) استفاده پاییه Text The text of QPushButton can be set upon creation or using setText(). To get the current text of the button use text(). Icon The icon of QPushButton can also be set upon creation. After creation the icon can be changed using setIcon() To get the current icon of the button use icon() Set Position and Size To set the position and the size of the button use setGeometry(). If you want just to modify the size of the button use resize() Handle Button QPushButton emits signals if an event occurs. To handle the button connect its appropriate signal to a slot: connect(m_button, SIGNAL (released()),this, SLOT (handleButton())); Example The following simple code snippet shows how to create and use QPushButton. It has been tested on Qt Symbian Simulator. An instance of QPushButton is created. Signal released() is connected to slot handleButton() which changes the text and the size of the button. To build and run the example: Create an empty folder Create a file for each of the below code snippets and add the example code to them (the name of the file should match the name above the snippet). All 4 files must be in the same folder. Using command line, navigate into the folder with the 4 files. run qmake on the project file: qmake PushButtonExample.pro If successful it will not print any output. This should create a file with the name Makefile in the folder. Build the application: make The application should compile without any issues. Run the application: ./PushButtonExample The above steps are for linux but can easily be followed on other systems by replacing make with the correct make call for the system. mainwindow.h #ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include <QPushButton> namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); private slots: void handleButton(); private: QPushButton *m_button; }; #endif // MAINWINDOW_H mainwindow.cpp #include "mainwindow.h" #include <QCoreApplication> MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) { // Create the button, make "this" the parent m_button = new QPushButton("My Button", this); // set size and location of the button m_button->setGeometry(QRect(QPoint(100, 100), QSize(200, 50))); // Connect button signal to appropriate slot connect(m_button, SIGNAL (released()), this, SLOT (handleButton())); } void MainWindow::handleButton() { // change the text m_button->setText("Example"); // resize button m_button->resize(100,100); } main.cpp #include "mainwindow.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication app(argc, argv); MainWindow mainWindow; mainWindow.showMaximized(); return app.exec(); } PushButtonExample.pro QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets TARGET = PushButtonExample TEMPLATE = app SOURCES += main.cpp \ mainwindow.cpp HEADERS += mainwindow.h