[转]Qt：自动完成的QLineEdit(非使用QCompleter版)

-------------------------------------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(); }