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• • 1 文本編輯器第一階段測試

1 文本編輯器第一階段測試

完成了第一階段的代碼編寫后，我們可以進行簡單的測試了。由于只是實現了界面，這里我們的測試更多的是關注有沒有內存泄漏情況的發生。

我們需要借助Linux下的QT Creator環境進行測試，在分析下點擊Vargrind的即可（如果沒有安裝需要自行安裝）。

測試中發現如下幾個地方會發生內存泄漏：

QAction對象未指定父對象。

QMenu對象未指定父對象。

我們需要對代碼進行修改，修改后的代碼文件結構如下：

MainWindow.h:

#ifndef _MAINWINDOW_H_ #define _MAINWINDOW_H_#include <QtGui/QMainWindow> #include <QKeySequence> #include <QMenuBar> #include <QToolBar> #include <QAction> #include <QPlainTextEdit> #include <QLabel>class MainWindow : public QMainWindow {Q_OBJECTprivate:QPlainTextEdit mainEditor;QLabel statusLbl;MainWindow();MainWindow(const MainWindow&);MainWindow& operator= (const MainWindow&);bool construct();bool initMenuBar();bool initToolBar();bool initStatusBar();bool initMainEditor();bool initFileMenu(QMenuBar* mb);bool initEditMenu(QMenuBar* mb);bool initFormatMenu(QMenuBar* mb);bool initViewMenu(QMenuBar* mb);bool initHelpMenu(QMenuBar* mb);bool initFileToolItem(QToolBar* tb);bool initEditToolItem(QToolBar* tb);bool initFormatToolItem(QToolBar* tb);bool initViewToolItem(QToolBar* tb);bool makeAction(QAction*& action, QWidget* parent, QString text, int key);bool makeAction(QAction*& action, QWidget* parent, QString tip, QString icon); public:static MainWindow* NewInstance();~MainWindow(); };#endif // _MAINWINDOW_H_

MainWindow.cpp：

#include "MainWindow.h" #include <QMenu> #include <QIcon> #include <QSize> #include <QStatusBar> #include <QLabel> #include <QDebug>MainWindow::MainWindow() {}MainWindow* MainWindow::NewInstance() {MainWindow* ret = new MainWindow();if( (ret == NULL) || !ret->construct() ){delete ret;ret = NULL;}return ret; }bool MainWindow::construct() {bool ret = true;ret = ret && initMenuBar();ret = ret && initToolBar();ret = ret && initStatusBar();ret = ret && initMainEditor();return ret; }bool MainWindow::initMenuBar() {bool ret = true;QMenuBar* mb = menuBar();ret = ret && initFileMenu(mb);ret = ret && initEditMenu(mb);ret = ret && initFormatMenu(mb);ret = ret && initViewMenu(mb);ret = ret && initHelpMenu(mb);return ret; }bool MainWindow::initToolBar() {bool ret = true;QToolBar* tb = addToolBar("Tool Bar");tb->setIconSize(QSize(16, 16));ret = ret && initFileToolItem(tb);tb->addSeparator();ret = ret && initEditToolItem(tb);tb->addSeparator();ret = ret && initFormatToolItem(tb);tb->addSeparator();ret = ret && initViewToolItem(tb);return ret; }bool MainWindow::initStatusBar() {bool ret = true;QStatusBar* sb = statusBar();QLabel* label = new QLabel("D.T.Software");if( label != NULL ){statusLbl.setMinimumWidth(200);statusLbl.setAlignment(Qt::AlignCenter);statusLbl.setText("Ln: 1 Col: 1");label->setMinimumWidth(200);label->setAlignment(Qt::AlignCenter);sb->addPermanentWidget(new QLabel());sb->addPermanentWidget(&statusLbl);sb->addPermanentWidget(label);}else{ret = false;}return ret; }bool MainWindow::initMainEditor() {bool ret = true;mainEditor.setParent(this);setCentralWidget(&mainEditor);return ret; }bool MainWindow::initFileMenu(QMenuBar* mb) {QMenu* menu = new QMenu("File(&F)", mb);bool ret = (menu != NULL);if( ret ){QAction* action = NULL;ret = ret && makeAction(action, menu, "New(&N)", Qt::CTRL + Qt::Key_N);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Open(&O)...", Qt::CTRL + Qt::Key_O);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Save(&S)", Qt::CTRL + Qt::Key_S);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Save As(&A)...", 0);if( ret ){menu->addAction(action);}menu->addSeparator();ret = ret && makeAction(action, menu, "Print(&P)...", Qt::CTRL + Qt::Key_P);if( ret ){menu->addAction(action);}menu->addSeparator();ret = ret && makeAction(action, menu, "Exit(&X)", 0);if( ret ){menu->addAction(action);}}if( ret ){mb->addMenu(menu);}else{delete menu;}return ret; }bool MainWindow::initEditMenu(QMenuBar* mb) {QMenu* menu = new QMenu("Edit(&E)", mb);bool ret = (menu != NULL);if( ret ){QAction* action = NULL;ret = ret && makeAction(action, menu, "Undo(&U)", Qt::CTRL + Qt::Key_Z);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Redo(&R)...", Qt::CTRL + Qt::Key_Y);if( ret ){menu->addAction(action);}menu->addSeparator();ret = ret && makeAction(action, menu, "Cut(&T)", Qt::CTRL + Qt::Key_X);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Copy(&C)...", Qt::CTRL + Qt::Key_C);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Paste(&P)...", Qt::CTRL + Qt::Key_V);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Delete(&L)", Qt::Key_Delete);if( ret ){menu->addAction(action);}menu->addSeparator();ret = ret && makeAction(action, menu, "Find(&F)...", Qt::CTRL + Qt::Key_F);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Replace(&R)...", Qt::CTRL + Qt::Key_H);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Goto(&G)...", Qt::CTRL + Qt::Key_G);if( ret ){menu->addAction(action);}menu->addSeparator();ret = ret && makeAction(action, menu, "Select All(&A)", Qt::CTRL + Qt::Key_A);if( ret ){menu->addAction(action);}}if( ret ){mb->addMenu(menu);}else{delete menu;}return ret; }bool MainWindow::initFormatMenu(QMenuBar* mb) {QMenu* menu = new QMenu("Format(&O)", mb);bool ret = (menu != NULL);if( ret ){QAction* action = NULL;ret = ret && makeAction(action, menu, "Auto Wrap(&W)", 0);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Font(&F)...", 0);if( ret ){menu->addAction(action);}}if( ret ){mb->addMenu(menu);}else{delete menu;}return ret; }bool MainWindow::initViewMenu(QMenuBar* mb) {QMenu* menu = new QMenu("View(&V)", mb);bool ret = (menu != NULL);if( ret ){QAction* action = NULL;ret = ret && makeAction(action, menu, "Tool Bar(&T)", 0);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "Status Bar(&S)", 0);if( ret ){menu->addAction(action);}}if( ret ){mb->addMenu(menu);}else{delete menu;}return ret; }bool MainWindow::initHelpMenu(QMenuBar* mb) {QMenu* menu = new QMenu("Help(&H)", mb);bool ret = (menu != NULL);if( ret ){QAction* action = NULL;ret = ret && makeAction(action, menu, "User Manual", 0);if( ret ){menu->addAction(action);}ret = ret && makeAction(action, menu, "About NotePad...", 0);if( ret ){menu->addAction(action);}}if( ret ){mb->addMenu(menu);}else{delete menu;}return ret; }bool MainWindow::initFileToolItem(QToolBar* tb) {bool ret = true;QAction* action = NULL;ret = ret && makeAction(action, tb, "New", ":/res/pic/new.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Open", ":/res/pic/open.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Save", ":/res/pic/save.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Save As", ":/res/pic/saveas.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Print", ":/res/pic/print.png");if( ret ){tb->addAction(action);}return ret; }bool MainWindow::initEditToolItem(QToolBar* tb) {bool ret = true;QAction* action = NULL;ret = ret && makeAction(action, tb, "Undo", ":/res/pic/undo.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Redo", ":/res/pic/redo.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Cut", ":/res/pic/cut.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Copy", ":/res/pic/copy.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Paste", ":/res/pic/paste.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Find", ":/res/pic/find.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Replace", ":/res/pic/replace.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Goto", ":/res/pic/goto.png");if( ret ){tb->addAction(action);}return ret; }bool MainWindow::initFormatToolItem(QToolBar* tb) {bool ret = true;QAction* action = NULL;ret = ret && makeAction(action, tb, "Auto Wrap", ":/res/pic/wrap.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Font", ":/res/pic/font.png");if( ret ){tb->addAction(action);}return ret; }bool MainWindow::initViewToolItem(QToolBar* tb) {bool ret = true;QAction* action = NULL;ret = ret && makeAction(action, tb, "Tool Bar", ":/res/pic/tool.png");if( ret ){tb->addAction(action);}ret = ret && makeAction(action, tb, "Status Bar", ":/res/pic/status.png");if( ret ){tb->addAction(action);}return ret; }bool MainWindow::makeAction(QAction*& action, QWidget* parent, QString text, int key) {bool ret = true;action = new QAction(text, parent);if( action != NULL ){action->setShortcut(QKeySequence(key));}else{ret = false;}return ret; }bool MainWindow::makeAction(QAction*& action, QWidget* parent, QString tip, QString icon) {bool ret = true;action = new QAction("", parent);if( action != NULL ){action->setToolTip(tip);action->setIcon(QIcon(icon));}else{ret = false;}return ret; }MainWindow::~MainWindow() {}

main.cpp：

#include <QtGui/QApplication> #include "MainWindow.h"int main(int argc, char *argv[]) {QApplication a(argc, argv);MainWindow* w = MainWindow::NewInstance();int ret = -1;if( w != NULL ){w->show();ret = a.exec();}delete w;return ret; }

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參考資料：

QT實驗分析教程

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