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