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1 文本编辑器中替换对话框的设计与实现

替换对话框需求分析：

• 可复用软件部分。
• 查找文本框中的指定字符串。
• 替换单个指定字符串。
• 替换所有指定字符串。

附加需求：

• 点击关闭按钮后隐藏。
  

替换对话框的设计与实现：

#ifndef _REPLACEDIALOG_H_#define _REPLACEDIALOG_H_#include "FindDialog.h"class ReplaceDialog : public FindDialog{
       Q_OBJECTprotected:    QLabel m_replaceLbl;    QLineEdit m_replaceEdit;    QPushButton m_replaceBtn;    QPushButton m_replaceAllBtn;    void initControl();    void connectSlot();protected slots:    void onReplaceClicked();    void onReplaceAllClicked();public:    explicit ReplaceDialog(QWidget *parent = 0, QPlainTextEdit* pText = 0);};#endif // _REPLACEDIALOG_H_

ReplaceDialog.cpp：

#include "ReplaceDialog.h"ReplaceDialog::ReplaceDialog(QWidget *parent,  QPlainTextEdit* pText) :    FindDialog(parent, pText){
       initControl();    connectSlot();    setWindowTitle("Replace");}void ReplaceDialog::initControl(){
       m_replaceLbl.setText("Replace To:");    m_replaceBtn.setText("Replace");    m_replaceAllBtn.setText("Replace All");    m_layout.removeWidget(&m_matchChkBx);    m_layout.removeWidget(&m_radioGrpBx);    m_layout.removeWidget(&m_closeBtn);    m_layout.addWidget(&m_replaceLbl, 1, 0);    m_layout.addWidget(&m_replaceEdit, 1, 1);    m_layout.addWidget(&m_replaceBtn, 1, 2);    m_layout.addWidget(&m_matchChkBx, 2, 0);    m_layout.addWidget(&m_radioGrpBx, 2, 1);    m_layout.addWidget(&m_replaceAllBtn, 2, 2);    m_layout.addWidget(&m_closeBtn, 3, 2);}void ReplaceDialog::connectSlot(){
       connect(&m_replaceBtn, SIGNAL(clicked()), this, SLOT(onReplaceClicked()));    connect(&m_replaceAllBtn, SIGNAL(clicked()), this, SLOT(onReplaceAllClicked()));}void ReplaceDialog::onReplaceClicked(){
       QString target = m_findEdit.text();    QString to = m_replaceEdit.text();    if( (m_pText != NULL) && (target != "") && (to != "") )    {
           QString selText = m_pText->textCursor().selectedText();        if( selText == target )        {
               m_pText->insertPlainText(to);        }        onFindClicked();    }}void ReplaceDialog::onReplaceAllClicked(){
       QString target = m_findEdit.text();    QString to = m_replaceEdit.text();    if( (m_pText != NULL) && (target != "") && (to != "") )    {
           QString text = m_pText->toPlainText();        text.replace(target, to, m_matchChkBx.isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive);        m_pText->clear();        m_pText->insertPlainText(text);    }}

参考资料：

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