1、Qt支援三種常用的文本編輯元件
(1)、QLineEdit:單行文本編輯元件
(2)、QTextEdit:多行富文本(有圖檔、視訊等)編輯元件
(3)、QPlainTextEdit:多行普通文本編輯元件
2、Qt中常用文本編輯元件的繼承層次圖
3、不同文本元件的特性比較
4、Qt中常用文本編輯元件内置功能
1、初探文本編輯元件
#include "MainWindow.h"
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent),
lineEdit(this), plainEdit(this), textEdit(this)
{
resize(600, 420);
lineEdit.move(20, 20);
lineEdit.resize(560, 100);
lineEdit.insert("QLineEdit");
lineEdit.insert("\n");
lineEdit.insert("<img src=\"C:\\Users\\hp\\Desktop\\D.T.png\" />");
plainEdit.move(20, 130);
plainEdit.resize(560, 130);
plainEdit.insertPlainText("QPlainTextEdit");
plainEdit.insertPlainText("\n");
plainEdit.insertPlainText("<img src=\"C:\\Users\\hp\\Desktop\\D.T.png\" />");
textEdit.move(20, 270);
textEdit.resize(560, 130);
textEdit.insertPlainText("QTextEdit");
textEdit.insertPlainText("\n");
textEdit.insertHtml("<img src=\"C:\\Users\\hp\\Desktop\\D.T.png\" />");
}
MainWindow::~MainWindow()
{
}
2、NopePad:
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMenuBar>
#include <QMenu>
#include <QAction>
#include <QString>
#include <QtGui/QMainWindow>
#include <QToolBar>
#include <QIcon>
#include <QSize>
#include <QStatusBar>
#include <QLabel>
#include <QPlainTextEdit>
class MainWindow : public QMainWindow
{
Q_OBJECT
private:
QPlainTextEdit mainEdit;
QLabel statusLabel;
MainWindow(QWidget *parent = 0);
MainWindow(const MainWindow& obj);
MainWindow* operator = (const MainWindow& obj);
bool construct();
bool initMenuBar();//菜單欄
bool initToolBar();//工具欄
bool initStatusBar();//狀态欄
bool initinitMainEditor();//編輯視窗
bool initFileMenu(QMenuBar* mb);//檔案菜單
bool initEditMenu(QMenuBar* mb);//編輯菜單
bool initFormatMenu(QMenuBar* mb);//格式菜單
bool initViewMenu(QMenuBar* mb);//視圖菜單
bool initHelpMenu(QMenuBar* mb);//幫助菜單
bool initFileToolItem(QToolBar* tb);
bool makeAction(QAction*& action, QString text, int ket);//菜單項
bool makeAction(QAction*& action, QString tip, QString icon);
public:
static MainWindow* NewInstance();
~MainWindow();
};
#endif // MAINWINDOW_H#include "MainWindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), statusLabel(this)
{
}
bool MainWindow::construct()
{
bool ret = true;
ret = ret && initMenuBar();
ret = ret && initToolBar();
ret = ret && initStatusBar();
ret = ret && initinitMainEditor();
return ret;
}
MainWindow* MainWindow::NewInstance()
{
MainWindow* ret = new MainWindow();
if((ret==NULL) || (!ret->construct()))
{
delete ret;
ret = NULL;
}
return ret;
}
bool MainWindow::initMenuBar()//菜單欄
{
bool ret = true;
QMenuBar* mb = menuBar();//一定要注意是menuBar(),這是普通成員函數,不是構造函數
ret = ret && initFileMenu(mb);//傳一個參數是為了在initFileMenu()函數将menu加入菜單欄
ret = ret && initEditMenu(mb);
ret = ret && initFormatMenu(mb);
ret = ret && initViewMenu(mb);
ret = ret && initHelpMenu(mb);
return ret;
}
bool MainWindow::initToolBar()//工具欄
{
bool ret = true;
QToolBar* tb = addToolBar("Tool Bar");
tb->setMovable(false);
tb->setFloatable(false);
tb->setIconSize(QSize(16,16));
ret = ret && initFileToolItem(tb);
return ret;
}
bool MainWindow::initStatusBar()//狀态欄
{
bool ret = true;
QStatusBar* sb = statusBar();
QLabel* label = new QLabel("Made By LGC");
if(label != NULL)
{
statusLabel.setMinimumWidth(200);
statusLabel.setAlignment(Qt::AlignHCenter);
statusLabel.setText("Ln:1 Col:1");
label->setMinimumWidth(200);
label->setAlignment(Qt::AlignHCenter);
sb->addPermanentWidget(new QLabel());//單純加入分隔符
sb->addPermanentWidget(&statusLabel);
sb->addPermanentWidget(label);
}
else
{
ret = false;
}
return ret;
}
bool MainWindow::initinitMainEditor()//編輯視窗
{
bool ret = true;
mainEdit.setParent(this);
setCentralWidget(&mainEdit);
return ret;
}
/************************************************檔案菜單********************************************************/
bool MainWindow::initFileMenu(QMenuBar* mb)
{
bool ret = true;
QMenu* menu = new QMenu("File(&F)");//建立檔案菜單,(&F)是為了可以Alt+F打開
ret = (menu != NULL);
if(ret)
{
QAction* action = NULL;
//New
ret = ret && makeAction(action, "New(&N)",Qt::CTRL + Qt::Key_N);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Open
ret = ret && makeAction(action, "Open(&O)...",Qt::CTRL + Qt::Key_O);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Save
ret = ret && makeAction(action, "Save(&S)",Qt::CTRL + Qt::Key_S);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Save As
ret = ret && makeAction(action, "Save As(&A)...",0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//print
ret = ret && makeAction(action, "Print(&P)...",Qt::CTRL + Qt::Key_P);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Exit
ret = ret && makeAction(action, "Exit(&X)",0);
if(ret)
{
menu->addAction(action);//将菜單項加入到菜單
}
}
if(ret)
{
mb->addMenu(menu);//将菜單加入到菜單欄
}
else
{
delete mb;
}
return ret;
}
/************************************************編輯菜單********************************************************/
bool MainWindow::initEditMenu(QMenuBar* mb)
{
bool ret = true;
QMenu* menu = new QMenu("Edit(&E)");
ret = (menu != NULL);
if(ret)
{
QAction* action = NULL;
//Undo
ret = ret && makeAction(action, "Undo(&U)",Qt::CTRL + Qt::Key_Z);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Redo
ret = ret && makeAction(action, "Redo(&R)...",Qt::CTRL + Qt::Key_Y);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Cut
ret = ret && makeAction(action, "Cut(&T)",Qt::CTRL + Qt::Key_X);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Copy
ret = ret && makeAction(action, "Copy(&C)...",Qt::CTRL + Qt::Key_C);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Pase
ret = ret && makeAction(action, "Pase(&P)...",Qt::CTRL + Qt::Key_V);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Delete
ret = ret && makeAction(action, "Delete(&L)",Qt::Key_Delete);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Find
ret = ret && makeAction(action, "Find(&F)...",Qt::CTRL + Qt::Key_F);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Replace
ret = ret && makeAction(action, "Replace(&R)...",Qt::CTRL + Qt::Key_H);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Goto
ret = ret && makeAction(action, "Goto(&G)",Qt::CTRL + Qt::Key_G);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Select All
ret = ret && makeAction(action, "Select All(&A)",Qt::CTRL + Qt::Key_A);
if(ret)
{
menu->addAction(action);
}
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete mb;
}
return ret;
}
/************************************************格式菜單********************************************************/
bool MainWindow::initFormatMenu(QMenuBar* mb)
{
bool ret = true;
QMenu* menu = new QMenu("Format(&O)");
ret = (menu != NULL);
if(ret)
{
QAction* action = NULL;
//Auto Wrap
ret = ret && makeAction(action, "Auto Wrap(&W)",0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Font
ret = ret && makeAction(action, "Font(&F)...",0);
if(ret)
{
menu->addAction(action);
}
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete mb;
}
return ret;
}
/************************************************視圖菜單********************************************************/
bool MainWindow::initViewMenu(QMenuBar* mb)
{
bool ret = true;
QMenu* menu = new QMenu("View(&V)");
ret = (menu != NULL);
if(ret)
{
QAction* action = NULL;
//Tool Bar
ret = ret && makeAction(action, "Tool Bar(&T)",0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//Status Bar
ret = ret && makeAction(action, "Status Bar(&S)",0);
if(ret)
{
menu->addAction(action);
}
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete mb;
}
return ret;
}
/************************************************幫助菜單********************************************************/
bool MainWindow::initHelpMenu(QMenuBar* mb)
{
bool ret = true;
QMenu* menu = new QMenu("Help(&H)");
ret = (menu != NULL);
if(ret)
{
QAction* action = NULL;
//User Manual
ret = ret && makeAction(action, "User Manual",0);
if(ret)
{
menu->addAction(action);
}
menu->addSeparator();
//About NotePad
ret = ret && makeAction(action, "About NotePad...",0);
if(ret)
{
menu->addAction(action);
}
}
if(ret)
{
mb->addMenu(menu);
}
else
{
delete mb;
}
return ret;
}
bool MainWindow::initFileToolItem(QToolBar* tb)
{
bool ret = true;
QAction* action = NULL;
ret = ret && makeAction(action, "New", ":/Res/pic/new.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Open", ":/Res/pic/open.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Save", ":/Res/pic/save.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Save As", ":/Res/pic/saveas.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Print", ":/Res/pic/print.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Undo", ":/Res/pic/undo.png");
if(ret)
{
tb->addAction(action);
}
ret = ret && makeAction(action, "Redo", ":/Res/pic/redo.png");
if(ret)
{
tb->addAction(action);
}
return ret;
}
bool MainWindow::makeAction(QAction*& action, QString text, int key)//菜單項
{
bool ret = true;
action = new QAction(text, NULL);
if(action != NULL)
{
action->setShortcut(QKeySequence(key));//建立快捷鍵
}
else
{
ret = false;
}
return ret;
}
bool MainWindow::makeAction(QAction*& action, QString tip, QString icon)
{
bool ret = true;
action = new QAction("", NULL);
if(action != NULL)
{
action->setToolTip(tip);
action->setIcon(QIcon(icon));
}
else
{
ret = false;
}
return ret;
}
MainWindow::~MainWindow()
{
}#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;
}
二、小結
(1)、Qt支援三種常用的文本編輯元件
(2)、Qt中的文本編輯元件封裝了常用的編輯功能
A、QLineEdit:單行文本編輯元件
B、QTextEdit:多行富文本編輯元件
C、QPlainTextEdit:多行普通文本編輯元件
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