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本章节会给大家带来基于文本编辑器 Easy Word V1.2开发升级到Easy Word V1.3开发的解析。
在编写包含格式设置的文本编辑程序时,经常用到的 Qt 类有 QTextEdit、 QTextDocument、
QTextBlock 、 QTextList 、 QTextFrame 、 QTextTable 、 QTextCharFormat 、 QTextBlockFormat 、
QTextListFormat 、 QTextFrameFormat 和 QTextTableFormat 等。
文本编辑各类之间的划分与关系如图一所示。
图一
任何一个文本编辑的程序都要用 QTextEdit 作为输入文本的容器,在它里面输入可编辑文本由 QTextDocument 作为载体,而用来表示 QTextDocument 的元素的 QTextBlock 、 QTextList 、QTextFrame 等是 QTextDocument 的不同表现形式,可以表示为字符串、段落、列表、表格或图片等。
每种元素都有自己的格式,这些格式则用 QTextCharFormat、 QTextBlockFormat、 QTextListFormat、
QTextFrameFormat 等类来描述与实现。例如, QTextBlockFormat 类对应于 QTextBlock 类, QTextBlock
类用千表示一块文本,通常可以理解为一个段落,但它并不仅指段落; QTextBlockFormat 类则表示这一块文本的格式,如缩进的值、与四边的边距等。
从图一中可以看出,用千表示编辑文本中的光标 QTextCursor 类是一个非常重要且经常用到的类,它提供了对 QTextDocument 文档的修改接口,所有对文档格式的修改,说到底都与光标有关 。 例如,改变字符的格式,实际上指的是改变光标处字符的格式 。 又例如,改变段落的格式,实际上指的是改变光标所在段落的格式。因此,所有对 QTextDocument 的修改都能够通过 QTextCursor 类实现, QTextCursor 类在文档编辑类程序中具有重要的作用 。
(1)在 “mainwindow.h” 头文件中添加 “private:” 变量:
/****************文本编辑功能*****************/
QLabel *fontLabel1; //字体设置项
QFontComboBox *fontComboBox;
QLabel *fontLabel2;
QComboBox *sizeComboBox;
QToolButton *boldBtn;
QToolButton *italicBtn;
QToolButton *underlineBtn;
QToolButton *colorBtn;
QToolBar *fontToolBar; //字体工具栏
(2)在函数createActions()中添加如下代码
//在工具栏上嵌入控件
//设置字号
fontLabel1 =new QLabel (tr("字体:"));
fontComboBox =new QFontComboBox;
fontComboBox->setFontFilters(QFontComboBox::ScalableFonts);
fontLabel2 =new QLabel(tr("字号:"));
sizeComboBox =new QComboBox;
QFontDatabase db;
/***************文本编辑功能******************/
foreach(int size,db.standardSizes())
{
sizeComboBox->addItem(QString::number(size));
}
boldBtn =new QToolButton;
boldBtn->setIcon(QIcon(":/src/bold.png"));
boldBtn->setCheckable(true);
italicBtn =new QToolButton;
italicBtn->setIcon(QIcon(":/src/italic.png"));
italicBtn->setCheckable(true);
underlineBtn =new QToolButton;
underlineBtn->setIcon(QIcon(":/src/underline.png"));
underlineBtn->setCheckable(true);
colorBtn =new QToolButton;
colorBtn->setIcon(QIcon(":/src/color.png"));
colorBtn->setCheckable(true);
(3)在相对应的工具栏 createToolBars() 函数中添加如下代码:
//字体工具条
fontToolBar =addToolBar("Font");
fontToolBar->addWidget(fontLabel1);
fontToolBar->addWidget(fontComboBox);
fontToolBar->addWidget(fontLabel2);
fontToolBar->addWidget(sizeComboBox);
fontToolBar->addSeparator();
fontToolBar->addWidget(boldBtn);
fontToolBar->addWidget (italicBtn);
fontToolBar->addWidget(underlineBtn);
fontToolBar->addSeparator();
fontToolBar->addWidget(colorBtn);
(1)在 “mainwindow.h” 头文件中添加 “private slots:” 变量:
/*****************文本编辑功能****************************/
void ShowFontComboBox(QString comboStr);
void ShowSizeSpinBox(QString spinValue);
void ShowBoldBtn();
void ShowItalicBtn() ;
void ShowUnderlineBtn();
void ShowColorBtn();
void ShowCurrentFormatChanged(const QTextCharFormat &fmt);
(2)在 createActions() 函数的”“放大“动作“最后添加事件关联:
connect (boldBtn, SIGNAL (clicked()),this,SLOT (ShowBoldBtn()));
connect (italicBtn, SIGNAL (clicked()), this, SLOT (ShowItalicBtn ())) ;
connect (underlineBtn, SIGNAL (clicked()), this, SLOT (ShowUnderlineBtn ()));
connect(colorBtn,SIGNAL(clicked()),this,SLOT(ShowColorBtn()));
connect(fontComboBox,SIGNAL(activated(QString)),this,SLOT(ShowFontComboBox(QString)));
connect(sizeComboBox,SIGNAL(activated(QString)),this,SLOT(ShowSizeSpinBox(QString)));
connect(showWidget->text,SIGNAL(currentCharFormatChanged(QTextCharFormat&)) , this,SLOT(ShowCurrentFormatChanged(QTextCharFormat&)));
(3)实现设置字体的函数 如下:
void MainWindow::ShowFontComboBox(QString comboStr) //设置字体
{
QTextCharFormat fmt; //创建一个 QTextCharFormat 对象
fmt.setFontFamily(comboStr); //选择的字体名称设置给 QTextCharFormat 对象
mergeFormat(fmt); ///将新的格式应用到光标选区内的字符
}
void MainWindow::mergeFormat(QTextCharFormat format)
{
QTextCursor cursor =showWidget->text->textCursor (); //获得编辑框中的光标
if (!cursor. hasSelection ()) //若光标没有高亮选区,则将光标所在处的词作为选区,由前后空格或",""."等标点符号区分词。
cursor.select(QTextCursor::WordUnderCursor);
cursor.mergeCharFormat (format); // 调用 QTextCursor 的 mergeCharFonnatO函数将参数format 所表示的格式应用到光标所在处的字符上。
showWidget->text->mergeCurrentCharFormat(format); //调用 QTextEdit 的 merge CurrentCharFormat()
//函数将格式应用到选区内的所有字符上。
}
void MainWindow::ShowSizeSpinBox(QString spinValue) //设置字号
{
QTextCharFormat fmt;
fmt.setFontPointSize (spinValue.toFloat());
showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowBoldBtn() //设置文字加粗
{
QTextCharFormat fmt;
fmt.setFontWeight(boldBtn->isChecked()?QFont::Bold:QFont:: Normal);
showWidget->text->mergeCurrentCharFormat(fmt);
/*其中,调用 QTextCharFormat 的 setFontWeightO函数设置粗细值,若检测到“加粗”按钮被按
下,则设置字符的 Weight 值为 QFont::Bold, 可直接设为 75; 反之,则设为 QFont: :Normal。文字的
粗细值由 QFont::Weight 表示,它是一个整型值,取值的范围可为 0~99, 有 5 个预置值,分别为
QFont::Light(25) 、 QFont::Normal(50) 、 QFont::DemiBold(63) 、 QFont: :Bold(75)和 QFont::Black(87),
通常在 QFont: :Normal 和 QFont::Bold 之间转换。*/
}
void MainWindow::ShowItalicBtn() //设置文字加下划线
{
QTextCharFormat fmt;
fmt.setFontItalic(italicBtn->isChecked());
showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowUnderlineBtn()
{
QTextCharFormat fmt;
fmt. setFontUnderline (underlineBtn->isChecked ());
showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowColorBtn() //设置颜色
{
QColor color=QColorDialog::getColor(Qt::red, this); //使用了标准颜色对话框的方式,当单击“颜色”按钮时,
//在弹出的标准颜色对话框中选择颜色。
if (color. isValid ())
{
QTextCharFormat fmt;
fmt.setForeground(color);
showWidget->text->mergeCurrentCharFormat(fmt);
}
/*标准颜色对话框 QColorDialog 类的使用:
QColor getColor
(
const QColor& initial=Qt::white,
QWidget* parent=0
);
第 1 个参数指定了选中的颜色,默认为白色。通过 QColor::isValidO可以判断用户选择的颜
色是否有效,若用户单击“取消" (Cancel) 按钮,则 QColor::isValid()返回 false 。第 2 个参数定
义了标准颜色对话框的父窗口。 */
}
void MainWindow::ShowCurrentFormatChanged(const QTextCharFormat &fmt)
{
fontComboBox->setCurrentIndex(fontComboBox->findText(fmt.fontFamily())) ;
sizeComboBox->setCurrentIndex(sizeComboBox->findText(QString::number(fmt.fontPointSize())));
boldBtn->setChecked (fmt.font().bold());
italicBtn->setChecked(fmt.fontItalic());
underlineBtn->setChecked(fmt.fontUnderline());
}
图一
图二
图标和图片放到新建的Resources中
工程文件(包含图标)已经上传GitHub,通过git直接拉取即可
git clone https://github.com/dhn111/EasyWord.git
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "showwidget.h"
#include
#include
#include
#include //读入文本
#include
#include
#include
#include //打印文本
#include
#include //打印图片
#include
#include
#include //文字颜色
#include
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();
void createActions(); //创建动作
void createMenus(); //创建菜单
void createToolBars (); //创建工具栏
void loadFile(QString filename);
void mergeFormat(QTextCharFormat);
private:
QMenu *fileMenu; //各项菜单栏
QMenu *zoomMenu;
QMenu *rotateMenu;
QMenu *mirrorMenu;
QImage img;
QString fileName;
ShowWidget *showWidget;
QAction *openFileAction; //文件菜单项
QAction *NewFileAction;
QAction *PrintTextAction;
QAction *PrintImageAction;
QAction *exitAction;
QAction *copyAction; //编辑菜单项
QAction *cutAction;
QAction *pasteAction;
QAction *aboutAction;
QAction *zoomInAction;
QAction *zoomOutAction;
QAction *rotate90Action; //旋转菜单项
QAction *rotate180Action;
QAction *rotate270Action;
QAction *mirrorVerticalAction; //镜像菜单项
QAction *mirrorHorizontalAction;
QAction *undoAction;
QAction *redoAction;
QToolBar *fileTool; //工具栏
QToolBar *zoomTool;
QToolBar *rotateTool;
QToolBar *mirrorTool;
QToolBar *doToolBar;
/****************文本编辑功能*****************/
QLabel *fontLabel1; //字体设置项
QFontComboBox *fontComboBox;
QLabel *fontLabel2;
QComboBox *sizeComboBox;
QToolButton *boldBtn;
QToolButton *italicBtn;
QToolButton *underlineBtn;
QToolButton *colorBtn;
QToolBar *fontToolBar; //字体工具栏
private slots:
void ShowNewFile(); //新建文件
void ShowOpenFile(); //打开文件
void ShowPrintText(); //打印文本
void ShowPrintImage(); //打印图像
void ShowZoomIn(); //缩放功能放大
void ShowZoomOut(); //缩放功能缩小
void ShowRotate90(); //旋转90°
void ShowRotate180(); //旋转180°
void ShowRotate270 (); //旋转270°
void ShowMirrorVertical(); //纵向
void ShowMirrorHorizontal (); //横向
/*****************文本编辑功能****************************/
void ShowFontComboBox(QString comboStr);
void ShowSizeSpinBox(QString spinValue);
void ShowBoldBtn();
void ShowItalicBtn() ;
void ShowUnderlineBtn();
void ShowColorBtn();
void ShowCurrentFormatChanged(const QTextCharFormat &fmt);
};
#endif // MAINWINDOW_H
#ifndef SHOWWIDGET_H
#define SHOWWIDGET_H
#include
#include
#include
#include
#include
class ShowWidget : public QWidget
{
Q_OBJECT
public:
explicit ShowWidget(QWidget *parent = nullptr);
QImage img;
QLabel *imageLabel;
QTextEdit *text;
signals:
public slots:
};
#endif // SHOWWIDGET_H
#include "mainwindow.h"
#include
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
//各项菜单栏
fileMenu = new QMenu;
zoomMenu = new QMenu;
rotateMenu = new QMenu;
mirrorMenu = new QMenu;
showWidget = new ShowWidget;
//文件菜单
openFileAction =new QAction;
NewFileAction =new QAction;
PrintTextAction =new QAction;
PrintImageAction =new QAction;
exitAction = new QAction;
//缩放菜单
copyAction =new QAction;
cutAction =new QAction;
pasteAction =new QAction;
aboutAction =new QAction;
zoomInAction =new QAction;
zoomOutAction=new QAction;
//旋转菜单项
rotate90Action =new QAction;
rotate180Action=new QAction;
rotate270Action=new QAction;
//镜像菜单项
mirrorVerticalAction =new QAction;
mirrorHorizontalAction=new QAction;
undoAction =new QAction;
redoAction =new QAction;
//工具栏
fileTool = new QToolBar;
zoomTool = new QToolBar;
rotateTool = new QToolBar;
mirrorTool = new QToolBar;
doToolBar = new QToolBar;
setWindowTitle(tr("Easy Word")); //设置窗体标题
showWidget =new ShowWidget(this); //(a)
setCentralWidget(showWidget);
/*创建动作、菜单、工具栏的函数*/
createActions() ;
createMenus();
createToolBars();
if(img.load(":/src/PKQ.png"))
{
//在 imageLabel 对象中放置图片
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
}
MainWindow::~MainWindow()
{
}
void MainWindow::createActions()
{
//“打开”动作
openFileAction =new QAction(QIcon(":/src/open.png"),tr("打开"),this); //(a)
openFileAction->setShortcut (tr ("Ctrl+O")); //(b)
openFileAction->setStatusTip(tr("打开一个文件 ")); //(c)
connect(openFileAction,SIGNAL(triggered()),this,SLOT(ShowOpenFile()));
//"新建“动作
NewFileAction =new QAction(QIcon(":/src/new.png"),tr("新建"),this);
NewFileAction->setShortcut(tr("Ctrl+N"));
NewFileAction->setStatusTip(tr("新建一个文件"));
connect(NewFileAction, SIGNAL (triggered()) , this, SLOT (ShowNewFile())) ;
// "退出“动作
exitAction =new QAction(tr("退出"),this);
exitAction->setShortcut(tr("Ctrl+Q"));
exitAction->setStatusTip(tr("退出程序")) ;
connect (exitAction, SIGNAL (triggered()), this, SLOT (close()));
// "复制”动作
copyAction =new QAction(QIcon(":/src/copy.png"),tr("复制"),this);
copyAction->setShortcut(tr("Ctrl+C"));
copyAction->setStatusTip(tr(" 复制文件")) ;
connect(copyAction,SIGNAL( triggered ()), showWidget->text, SLOT(copy()));
//"剪切“动作
cutAction =new QAction(QIcon(":/src/cut.png"),tr("剪切"),this);
cutAction->setShortcut(tr("Ctrl+X"));
cutAction->setStatusTip(tr("剪切文件")) ;
connect(cutAction,SIGNAL( triggered ()), showWidget->text, SLOT (cut()));
//"粘贴“动作
pasteAction =new QAction(QIcon(":/src/paste.png"),tr("粘贴"),this);
pasteAction->setShortcut(tr("Ctrl+V"));
pasteAction->setStatusTip(tr("粘贴文件")) ;
connect(pasteAction,SIGNAL(triggered()),showWidget->text,SLOT (paste()));
//"关于“动作
aboutAction =new QAction(tr("关于"),this);
connect(aboutAction,SIGNAL(triggered()),this,SLOT(QApplication::aboutQt()));
//"打印文本“动作
PrintTextAction =new QAction(QIcon(":/src/printText.png"),tr(" 打印文本"), this);
PrintTextAction->setStatusTip(tr("打印一个文本"));
connect (PrintTextAction, SIGNAL (triggered()), this, SLOT (ShowPrintText ()));
//"打印图片“动作
PrintImageAction =new QAction(QIcon (":/src/printimage.png" ), tr("打印图片"), this);
PrintImageAction->setStatusTip(tr("打印一幅图片"));
connect(PrintImageAction, SIGNAL (triggered()), this, SLOT (ShowPrintImage()));
//"放大“动作
zoomInAction =new QAction (QIcon(":/src/zoomin.png"),tr(" 放大 "),this);
zoomInAction->setStatusTip(tr("放大一幅图片"));
connect(zoomInAction,SIGNAL(triggered()),this,SLOT(ShowZoomIn()));
//"缩小“动作
zoomOutAction =new QAction(QIcon(":/src/zoomout.png"),tr("缩小 "),this);
zoomOutAction->setStatusTip(tr("缩小一幅图片 "));
connect (zoomOutAction, SIGNAL(triggered ()), this, SLOT (ShowZoomOut()));
//实现图片旋转的动作 (Action)
//旋转 90°
rotate90Action =new QAction (QIcon (":/src/rotate90.png"), tr("旋转 90°") ,this);
rotate90Action->setStatusTip(tr("将一幅图旋转90°"));
connect(rotate90Action, SIGNAL (triggered()), this, SLOT (ShowRotate90()));
//旋转180°
rotate180Action =new QAction (QIcon(":/src/rotate180.png"), tr("旋转 180°"), this);
rotate180Action->setStatusTip(tr("将一幅图旋转180°"));
connect(rotate180Action, SIGNAL (triggered()), this, SLOT (ShowRotate180()));
//旋转270°
rotate270Action =new QAction(QIcon (":/src/rotate270.png"), tr("旋转 270°"), this);
rotate270Action->setStatusTip(tr("将一幅图旋转 270°"));
connect(rotate270Action, SIGNAL (triggered()), this, SLOT (ShowRotate270()));
//实现图片镜像的动作(Action)
//纵向镜像
mirrorVerticalAction =new QAction(QIcon(":/src/mirrorVertical.png"),tr("纵向镜像"), this);
mirrorVerticalAction->setStatusTip(tr("对一幅图做纵向镜像")) ;
connect (mirrorVerticalAction, SIGNAL (triggered()), this, SLOT (ShowMirrorVertical()));
//横向镜像
mirrorHorizontalAction =new QAction(QIcon(":/src/mirrorHorizontal.png"),tr("横向镜像 "),this);
mirrorHorizontalAction->setStatusTip(tr("对一幅图做横向镜像")) ;
connect (mirrorHorizontalAction, SIGNAL (triggered()), this, SLOT (ShowMirrorHorizontal ()));
//实现撤销和重做的动作(ACtion)
//撤销和重做
undoAction =new QAction (QIcon(":/src/undo.png"),"撤销",this);
connect(undoAction,SIGNAL(triggered()),showWidget->text,SLOT(undo()));
redoAction =new QAction(QIcon(":/src/redo.png"),"重做",this);
connect(redoAction, SIGNAL(triggered()),showWidget->text,SLOT(redo()));
//在工具栏上嵌入控件
//设置字号
fontLabel1 =new QLabel (tr("字体:"));
fontComboBox =new QFontComboBox;
fontComboBox->setFontFilters(QFontComboBox::ScalableFonts);
fontLabel2 =new QLabel(tr("字号:"));
sizeComboBox =new QComboBox;
QFontDatabase db;
/***************文本编辑功能******************/
foreach(int size,db.standardSizes())
{
sizeComboBox->addItem(QString::number(size));
}
boldBtn =new QToolButton;
boldBtn->setIcon(QIcon(":/src/bold.png"));
boldBtn->setCheckable(true);
connect (boldBtn, SIGNAL (clicked()),this,SLOT (ShowBoldBtn()));
italicBtn =new QToolButton;
italicBtn->setIcon(QIcon(":/src/italic.png"));
italicBtn->setCheckable(true);
connect (italicBtn, SIGNAL (clicked()), this, SLOT (ShowItalicBtn ())) ;
underlineBtn =new QToolButton;
underlineBtn->setIcon(QIcon(":/src/underline.png"));
underlineBtn->setCheckable(true);
connect (underlineBtn, SIGNAL (clicked()), this, SLOT (ShowUnderlineBtn ()));
colorBtn =new QToolButton;
colorBtn->setIcon(QIcon(":/src/color.png"));
colorBtn->setCheckable(true);
connect(colorBtn,SIGNAL(clicked()),this,SLOT(ShowColorBtn()));
connect(fontComboBox,SIGNAL(activated(QString)),this,SLOT(ShowFontComboBox(QString)));
connect(sizeComboBox,SIGNAL(activated(QString)),this,SLOT(ShowSizeSpinBox(QString)));
connect(showWidget->text,SIGNAL(currentCharFormatChanged(QTextCharFormat&)) , this,SLOT(ShowCurrentFormatChanged(const QTextCharFormat &fmt)));
}
void MainWindow::createMenus()
{
//文件菜单
fileMenu =menuBar()->addMenu(tr("文件")) ;
fileMenu->addAction(openFileAction);
fileMenu->addAction(NewFileAction);
fileMenu->addAction(PrintTextAction);
fileMenu->addAction(PrintImageAction);
fileMenu->addSeparator();
fileMenu->addAction(exitAction);
//缩放菜单
zoomMenu =menuBar()->addMenu(tr("编辑")) ;
zoomMenu->addAction(copyAction);
zoomMenu->addAction(cutAction);
zoomMenu->addAction(pasteAction);
zoomMenu->addAction(aboutAction);
zoomMenu->addSeparator();
zoomMenu->addAction(zoomInAction);
zoomMenu->addAction(zoomOutAction);
//旋转菜单
rotateMenu =menuBar ()->addMenu(tr("旋转")) ;
rotateMenu->addAction(rotate90Action);
rotateMenu->addAction(rotate180Action);
rotateMenu->addAction(rotate270Action);
//镜像菜单
mirrorMenu =menuBar()->addMenu(tr(" 镜像")) ;
mirrorMenu->addAction(mirrorVerticalAction);
mirrorMenu->addAction(mirrorHorizontalAction);
}
void MainWindow::createToolBars()
{
//文件工具条
fileTool =addToolBar("File");
fileTool->addAction(openFileAction);
fileTool->addAction(NewFileAction);
fileTool->addAction(PrintTextAction);
fileTool->addAction(PrintImageAction);
//编辑工具条
zoomTool =addToolBar("Edit");
zoomTool->addAction(copyAction);
zoomTool->addAction(cutAction);
zoomTool->addAction(pasteAction);
zoomTool->addSeparator();
zoomTool->addAction(zoomInAction);
zoomTool->addAction(zoomOutAction);
//旋转工具条
rotateTool =addToolBar("rotate");
rotateTool->addAction(rotate90Action);
rotateTool->addAction(rotate180Action);
rotateTool->addAction(rotate270Action);
//撤销和重做工具条
doToolBar =addToolBar("doEdit");
doToolBar->addAction(undoAction);
doToolBar->addAction(redoAction);
//字体工具条
fontToolBar =addToolBar("Font");
fontToolBar->addWidget(fontLabel1);
fontToolBar->addWidget(fontComboBox);
fontToolBar->addWidget(fontLabel2);
fontToolBar->addWidget(sizeComboBox);
fontToolBar->addSeparator();
fontToolBar->addWidget(boldBtn);
fontToolBar->addWidget (italicBtn);
fontToolBar->addWidget(underlineBtn);
fontToolBar->addSeparator();
fontToolBar->addWidget(colorBtn);
}
void MainWindow::ShowNewFile() //新建文件的槽
{
MainWindow *newMainWindow =new MainWindow;
newMainWindow->show();
}
void MainWindow::ShowOpenFile() //读取文件的槽
{
fileName =QFileDialog::getOpenFileName(this);
if(!fileName.isEmpty())
{
if(showWidget->text->document()->isEmpty())
{
loadFile(fileName);
}else
{
MainWindow *newMainWindows = new MainWindow;
newMainWindows->show();
newMainWindows->loadFile(fileName);
}
}
}
#if 1
void MainWindow::loadFile(QString filename)
{
QFile file(filename);
if(file.open(QIODevice::ReadOnly|QIODevice::Text))
{
QTextStream textStream(&file);
while(!textStream.atEnd())
{
showWidget->text->append(textStream.readLine());
}
}
}
#endif
#if 0
void MainWindow::loadFile(QString filename)
{
QFile file(filename);
QTextCodec *codec = QTextCodec::codecForName("GBK");
if(file.open(QIODevice::ReadOnly|QIODevice::Text))
{
while(!file.atEnd())
{
QByteArray line = file.readLine();
QString str = codec->toUnicode(line);
showWidget->text->append(str);
//qDebug()<
}
}
}
#endif
void MainWindow::ShowPrintText() //文本打印
{
QPrinter printer;
QPrintDialog printDialog(&printer,this);
if(printDialog.exec())
{
//获得QTextEdit对象的文档
QTextDocument *doc =showWidget->text->document();
doc->print(&printer); //打印
}
}
void MainWindow::ShowPrintImage() //图像打印
{
QPrinter printer;
QPrintDialog printDialog(&printer,this);
if(printDialog.exec())
{
QPainter painter(&printer);
QRect rect =painter.viewport(); //获得QPainter对象的视图矩形区域
QSize size = img.size(); //获得图像的大小
/*按照图形的比例大小重新设置视图矩形区域*/
size.scale(rect.size(), Qt::KeepAspectRatio);
painter.setViewport(rect.x(),rect.y(),size.width(),size.height());
painter.setWindow(img.rect());
painter.drawImage(0,0,img);
}
}
void MainWindow::ShowZoomIn() //图像放大
{
if(img.isNull()) //有效性判断
{
return;
}
QMatrix matrix; //声明一个QMatrix类的实例
matrix.scale(2,2);
img = img.transformed(matrix);
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowZoomOut() //图像缩小
{
if (img.isNull())
{
return;
}
QMatrix matrix;
matrix.scale(0.5,0.5);
img=img.transformed(matrix);
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowRotate90() //旋转90°
{
if(img.isNull())
{
return;
}
QMatrix matrix;
matrix.rotate(90);
img = img.transformed(matrix);
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowRotate180() //旋转180°
{
if(img.isNull())
{
return;
}
QMatrix matrix;
matrix.rotate(180);
img = img.transformed(matrix);
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowRotate270() //旋转270°
{
if(img.isNull())
{
return;
}
QMatrix matrix;
matrix.rotate(270);
img = img.transformed(matrix);
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowMirrorVertical() //纵向镜像
{
if(img. isNull ())
return;
img=img.mirrored(false,true);
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowMirrorHorizontal() //横向镜像
{
if(img. isNull ())
return;
img=img.mirrored(true,false);
showWidget->imageLabel->setPixmap(QPixmap::fromImage(img));
}
void MainWindow::ShowFontComboBox(QString comboStr)
{
QTextCharFormat fmt; //设置字体
fmt.setFontFamily(comboStr);
mergeFormat(fmt);
}
void MainWindow::mergeFormat(QTextCharFormat format)
{
QTextCursor cursor =showWidget->text->textCursor (); //获得编辑框中的光标
if (!cursor. hasSelection ()) //(a)
cursor.select(QTextCursor::WordUnderCursor);
cursor.mergeCharFormat (format); // (b)
showWidget->text->mergeCurrentCharFormat(format); //(c)
}
void MainWindow::ShowSizeSpinBox(QString spinValue)
{
QTextCharFormat fmt;
fmt.setFontPointSize (spinValue.toFloat());
showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowBoldBtn()
{
QTextCharFormat fmt;
fmt.setFontWeight(boldBtn->isChecked()?QFont::Bold:QFont:: Normal);
showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowItalicBtn()
{
QTextCharFormat fmt;
fmt.setFontItalic(italicBtn->isChecked());
showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowUnderlineBtn()
{
QTextCharFormat fmt;
fmt. setFontUnderline (underlineBtn->isChecked ());
showWidget->text->mergeCurrentCharFormat(fmt);
}
void MainWindow::ShowColorBtn()
{
QColor color=QColorDialog::getColor(Qt::red, this);
if (color. isValid ())
{
QTextCharFormat fmt;
fmt.setForeground(color);
showWidget->text->mergeCurrentCharFormat(fmt);
}
}
void MainWindow::ShowCurrentFormatChanged(const QTextCharFormat &fmt)
{
fontComboBox->setCurrentIndex(fontComboBox->findText(fmt.fontFamily())) ;
sizeComboBox->setCurrentIndex(sizeComboBox->findText(QString::number(fmt.fontPointSize())));
boldBtn->setChecked (fmt.font().bold());
italicBtn->setChecked(fmt.fontItalic());
underlineBtn->setChecked(fmt.fontUnderline());
}
#include "showwidget.h"
ShowWidget::ShowWidget(QWidget *parent) : QWidget(parent)
{
imageLabel =new QLabel;
imageLabel->setScaledContents( true);
text =new QTextEdit;
QHBoxLayout *mainLayout =new QHBoxLayout(this);
mainLayout->addWidget(imageLabel);
mainLayout->addWidget(text);
}
窗口构成会在应用程序开发中经常用到的