网站建设详细报价,wordpress做微博,济南网站建设开发与制作,公司网站备案需要哪些示例代码创建了一个名为ComboBoxWidget的自定义QWidget类#xff0c;并在initUI方法中创建了一个垂直布局。然后将一个只读的QLineEdit和一个QPushButton添加到布局中。当按钮被点击时#xff0c;会调用showMenu方法#xff0c;该方法创建一个QMenu并添加选项。每个选项连接… 示例代码创建了一个名为ComboBoxWidget的自定义QWidget类并在initUI方法中创建了一个垂直布局。然后将一个只读的QLineEdit和一个QPushButton添加到布局中。当按钮被点击时会调用showMenu方法该方法创建一个QMenu并添加选项。每个选项连接到自定义的onOptionSelected方法该方法在选择一个选项时被调用并将选项的文本设置到QLineEdit中 #pragma execution_character_set(utf-8)#include QApplication
#include QWidget
#include QHBoxLayout
#include QLineEdit
#include QPushButton
#include QMenu
#include QActionclass ComboBoxWidget : public QWidget
{
public:ComboBoxWidget(QWidget* parent nullptr) : QWidget(parent) {initUI();}private:void initUI() {QHBoxLayout* layout new QHBoxLayout(this);layout-setSpacing(0);lineEdit new QLineEdit(this);lineEdit-setReadOnly(true);lineEdit-setAlignment(Qt::AlignCenter);button new QPushButton(▼, this);button-setFixedWidth(30);layout-addWidget(lineEdit);layout-addWidget(button);connect(button, QPushButton::clicked, this, ComboBoxWidget::showMenu);setLayout(layout);setGeometry(300, 300, 200, 100);setWindowTitle(ComboBox Example);show();}void showMenu() {QMenu* menu new QMenu(this);menu-setFixedWidth(lineEdit-width() button-width());QAction* action1 new QAction(Option 1, this);connect(action1, QAction::triggered, [this, action1]() { onOptionSelected(action1-text()); });QAction* action2 new QAction(Option 2, this);connect(action2, QAction::triggered, [this, action2]() { onOptionSelected(action2-text()); });QAction* action3 new QAction(Option 3, this);connect(action3, QAction::triggered, [this, action3]() { onOptionSelected(action3-text()); });QAction* action4 new QAction(Option 4, this);connect(action4, QAction::triggered, [this, action4]() { onOptionSelected(action4-text()); });menu-addAction(action1);menu-addAction(action2);menu-addAction(action3);menu-addAction(action4);menu-exec(lineEdit-mapToGlobal(lineEdit-rect().bottomLeft()));}void onOptionSelected(const QString text) {lineEdit-setText(text);}private:QLineEdit* lineEdit;QPushButton* button;
};int main(int argc, char* argv[])
{QApplication app(argc, argv);ComboBoxWidget widget;widget.show();return app.exec();
}效果展示
