[转]Qt：自动完成的QLineEdit(非使用QCompleter版)

最新推荐文章于 2024-06-29 11:40:54 发布

转载最新推荐文章于 2024-06-29 11:40:54 发布 · 3.3k 阅读

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本文介绍了一个基于Qt的自定义LineEdit组件，该组件能够提供输入提示和自动补全功能。通过监听用户的输入，组件会从预设的词汇列表中筛选出匹配项并展示在一个下拉列表中供用户选择。

-------------------------------------CompleteLineEdit.h-------------------------------------

#ifndef COMPLETELINEEDIT_H #define COMPLETELINEEDIT_H #include <QtGui/QLineEdit> #include <QStringList> class QListView; class QStringListModel; class QModelIndex; class CompleteLineEdit : public QLineEdit { Q_OBJECT public: CompleteLineEdit(QStringList words, QWidget *parent = 0); public slots: void setCompleter(const QString &text); // 动态的显示完成列表 void completeText(const QModelIndex &index); // 点击完成列表中的项，使用此项自动完成输入的单词 protected: virtual void keyPressEvent(QKeyEvent *e); virtual void focusOutEvent(QFocusEvent *e); private: QStringList words; // 整个完成列表的单词 QListView *listView; // 完成列表 QStringListModel *model; // 完成列表的model }; #endif // COMPLETELINEEDIT_H

-------------------------------------CompleteLineEdit.cpp-------------------------------------

#include "CompleteLineEdit.h" #include <QKeyEvent> #include <QtGui/QListView> #include <QtGui/QStringListModel> #include <QDebug> CompleteLineEdit::CompleteLineEdit(QStringList words, QWidget *parent) : QLineEdit(parent), words(words) { listView = new QListView(this); model = new QStringListModel(this); listView->setWindowFlags(Qt::ToolTip); connect(this, SIGNAL(textChanged(const QString &)), this, SLOT(setCompleter(const QString &))); connect(listView, SIGNAL(clicked(const QModelIndex &)), this, SLOT(completeText(const QModelIndex &))); } void CompleteLineEdit::focusOutEvent(QFocusEvent *e) { //listView->hide(); } void CompleteLineEdit::keyPressEvent(QKeyEvent *e) { if (!listView->isHidden()) { int key = e->key(); int count = listView->model()->rowCount(); QModelIndex currentIndex = listView->currentIndex(); if (Qt::Key_Down == key) { // 按向下方向键时，移动光标选中下一个完成列表中的项 int row = currentIndex.row() + 1; if (row >= count) { row = 0; } QModelIndex index = listView->model()->index(row, 0); listView->setCurrentIndex(index); } else if (Qt::Key_Up == key) { // 按向下方向键时，移动光标选中上一个完成列表中的项 int row = currentIndex.row() - 1; if (row < 0) { row = count - 1; } QModelIndex index = listView->model()->index(row, 0); listView->setCurrentIndex(index); } else if (Qt::Key_Escape == key) { // 按下Esc键时，隐藏完成列表 listView->hide(); } else if (Qt::Key_Enter == key || Qt::Key_Return == key) { // 按下回车键时，使用完成列表中选中的项，并隐藏完成列表 if (currentIndex.isValid()) { QString text = listView->currentIndex().data().toString(); setText(text); } listView->hide(); } else { // 其他情况，隐藏完成列表，并使用QLineEdit的键盘按下事件 listView->hide(); QLineEdit::keyPressEvent(e); } } else { QLineEdit::keyPressEvent(e); } } void CompleteLineEdit::setCompleter(const QString &text) { if (text.isEmpty()) { listView->hide(); return; } if ((text.length() > 1) && (!listView->isHidden())) { return; } // 如果完整的完成列表中的某个单词包含输入的文本，则加入要显示的完成列表串中 QStringList sl; foreach(QString word, words) { if (word.contains(text)) { sl << word; } } model->setStringList(sl); listView->setModel(model); if (model->rowCount() == 0) { return; } // Position the text edit listView->setMinimumWidth(width()); listView->setMaximumWidth(width()); QPoint p(0, height()); int x = mapToGlobal(p).x(); int y = mapToGlobal(p).y() + 1; listView->move(x, y); listView->show(); } void CompleteLineEdit::completeText(const QModelIndex &index) { QString text = index.data().toString(); setText(text); listView->hide(); }

-------------------------------------main.cpp----------------------------------

#include <QtGui/QApplication> #include "CompleteLineEdit.h" #include <QtGui> #include <QCompleter> #include <QStringList> int main(int argc, char *argv[]) { QApplication a(argc, argv); QStringList sl = QStringList() << "Biao" << "Bin" << "Huang" << "Hua" << "Hello" << "BinBin" << "Hallo"; QWidget widgetw; CompleteLineEdit * edit= new CompleteLineEdit(sl); QPushButton *button = new QPushButton("Button"); QHBoxLayout *layout = new QHBoxLayout(); layout->addWidget(edit); layout->addWidget(button); widgetw.setLayout(layout); widgetw.show(); CompleteLineEdit e(sl); e.show(); return a.exec(); }