• qt 自动完成LineEdit


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

    http://www.cnblogs.com/foxhengxing/archive/2010/09/08/1821796.html

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  • 原文地址:https://www.cnblogs.com/findumars/p/4982795.html
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