c++ qt自定义搜索编辑框的实现方法

时间：2023-03-13 12:13:22|栏目：C代码|点击：次

自定义LineEdit

csearchlineedit.h

#ifndef CSEARCHLINEEDIT_H
#define CSEARCHLINEEDIT_H

#include <QLineEdit>
#include <QPushButton>
#include <QWidget>
class CSearchLineEdit : public QLineEdit
{
    Q_OBJECT
public:
    CSearchLineEdit(QWidget* parent = nullptr);
signals:
    void sig_search(const QString& context);
private slots:
    void on_ClickedSearch();
private:
    QPushButton *m_pBtn = nullptr;
};
#endif // CSEARCHLINEEDIT_H

csearchlineedit.cpp

#include "csearchlineedit.h"
#include <QHBoxLayout>

CSearchLineEdit::CSearchLineEdit(QWidget* parent)
    :QLineEdit(parent)
{
    m_pBtn = new QPushButton(this);
    m_pBtn->setCursor(Qt::PointingHandCursor);
    m_pBtn->setFixedSize(22, 22);
    m_pBtn->setToolTip(QStringLiteral("搜索"));
    m_pBtn->setStyleSheet("QPushButton{border-image:url(:/images/icon_search_normal); background:transparent;} \
                                     QPushButton:hover{border-image:url(:/images/icon_search_hover)} \
                                     QPushButton:pressed{border-image:url(:/images/icon_search_press)}");
    // 防止文本框输入内容位于按钮之下
    QMargins margins = this->textMargins();
    //设置文本内容左上右下的间隙
    this->setTextMargins(0, 0, m_pBtn->width() + 1, 0);
    this->setPlaceholderText(QStringLiteral("请输入搜索内容"));
    // 给编辑框设置布局
    QHBoxLayout *pSearchLayout = new QHBoxLayout(this);
    pSearchLayout->addStretch();
    pSearchLayout->addWidget(m_pBtn);
    pSearchLayout->setSpacing(0);
    pSearchLayout->setContentsMargins(0, 0, 0, 0);
    this->setLayout(pSearchLayout);
    connect(m_pBtn, &QPushButton::clicked, this, &CSearchLineEdit::on_ClickedSearch);
}
void CSearchLineEdit::on_ClickedSearch()
    // 其它逻辑
    emit sig_search(this->text());

注意这里是在主界面接收搜索按钮的点击事件，槽函数的参数是搜索内容，const QString&，当然也可以在CSearchLineEdit里处理，不过一般习惯把控件代码和逻辑代码分开，尽量不在控件类里处理业务逻辑。

主界面代码

#include "widget.h"
#include <QLineEdit>
#include <QPushButton>
#include <QMessageBox>
#include <QHBoxLayout>
#include "csearchlineedit.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    resize(400, 300);
    setWindowTitle(QStringLiteral("自定义搜索框"));
    CSearchLineEdit *pLineEdit = new CSearchLineEdit(this);
    QVBoxLayout *pLayout = new QVBoxLayout();
    pLayout->addWidget(pLineEdit);
    pLayout->setContentsMargins(10, 10, 10, 10);
    setLayout(pLayout);
    connect(pLineEdit, &CSearchLineEdit::sig_search, this, &Widget::onSearch);
}
Widget::~Widget()
void Widget::onSearch(const QString& context)
    if (context.isEmpty())
    {
        QMessageBox::information(this, QStringLiteral("提示"), QStringLiteral("搜索内容为空"));
        return;
    }
    QMessageBox::information(this, QStringLiteral("提示"), QStringLiteral("搜索内容为%1").arg(context));