-------------------------------------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); // 動(dòng)態(tài)的顯示完成列表

void completeText( const QModelIndex &index); // 點(diǎn)擊完成列表中的項(xiàng)，使用此項(xiàng)自動(dòng)完成輸入的單詞

protected :

virtual void keyPressEvent(QKeyEvent *e);

virtual void focusOutEvent(QFocusEvent *e);

private :

QStringList words; // 整個(gè)完成列表的單詞

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) {

// 按向下方向鍵時(shí)，移動(dòng)光標(biāo)選中下一個(gè)完成列表中的項(xiàng)

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) {

// 按向下方向鍵時(shí)，移動(dòng)光標(biāo)選中上一個(gè)完成列表中的項(xiàng)

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 鍵時(shí)，隱藏完成列表

listView->hide();

} else if (Qt::Key_Enter == key || Qt::Key_Return == key) {

// 按下回車鍵時(shí)，使用完成列表中選中的項(xiàng)，并隱藏完成列表

if (currentIndex.isValid()) {

QString text = listView->currentIndex().data().toString();

setText(text);

}

listView->hide();

} else {

// 其他情況，隱藏完成列表，并使用 QLineEdit 的鍵盤按下事件

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個(gè)單詞包含輸入的文本，則加入要顯示的完成列表串中

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();

}