Listing 2. editor.cpp  

  1 #include "editor.h"
  2
  3 #include <qtextedit.h>
  4 #include <qmessagebox.h>
  5 #include <qfiledialog.h>
  6 #include <qfile.h>
  7 #include <qstatusbar.h>
  8 #include <qstylesheet.h>
  9 #include <qapplication.h>
 10
 11 /*
 12  *  Constructs an Editor which is a child of
 13  *  'parent', with the
 14  *  name 'name' and widget flags set to 'f'.
 15  */
 16 Editor::Editor( QWidget* parent,
 17                 const char* name, WFlags fl )
 18     : ljeditor( parent, name, fl )
 19 {
 20     editField = ljeditor::TextEdit;
 21     fileName = "";
 22 }
 23
 24 /*
 25  *  Destroys the object and frees any allocated
 26  *  resources.
 27  */
 28 Editor::~Editor()
 29 {
 30     // no need to delete child widgets,
 31     // Qt does it all for us
 32 }
 33
 34 /*
 35  * Opens a new editor window.
 36  */
 37 void Editor::fileNew()
 38 {
 39     Editor * editor = new Editor;
 40     editor->show();
 41 }
 42
 43 /*
 44  * Opens a file in this editor window.
 45  */
 46 void Editor::fileOpen()
 47 {
 48     if ( ! saveAndContinue( tr( "Opening file [nlb]
    aborted" ) ) )
 49         return;
 50
 51     editField->setText( "" );
 52     setCaption( tr( "ljedit" ) );
 53
 54
 55     fileName = QFileDialog::getOpenFileName( ".",
 56                             QString::null, this,
 57                             "opendialog",
 58                             tr( "Open File ..." ) );
 59
 60     if ( fileName.isEmpty() ){
 61         statusBar()->message( tr( "Opening file[nlb]
    aborted" ),
 62                           2000 );
 63         return;
 64     }
 65
 66     QFile file( fileName );
 67     if ( ! file.open( IO_ReadOnly ) ){
 68         statusBar()->message( QString( tr( [nlb]
    "Can't read %1" ) ).arg( fileName ),
 69                           2000 );
 70         return;
 71     }
 72
 73     QTextStream t( &file );
 74     QString text = t.read();
 75     if ( QStyleSheet::mightBeRichText( text ) )
 76         editField->setTextFormat( RichText );
 77     else
 78         editField->setTextFormat( PlainText );
 79
 80     editField->setText( text );
 81     setCaption( fileName );
 82     statusBar()->message( QString( tr( "%1 [nlb]
    loaded" ) ).arg( fileName ),
 83                           2000 );
 84 }
 85
 86 /*
 87  * Save the content of the editor in fileName.
 88  */
 89 void Editor::fileSave()
 90 {
 91     if ( fileName.isEmpty() ){
 92         fileSaveAs();
 93         return;
 94     }
 95
 96     QFile file( fileName );
 97     if ( ! file.open( IO_WriteOnly ) ) {
 98         statusBar()->message( QString( tr( "Could[nlb]
    not write to %1" ) ).arg(fileName),
 99                               2000 );
100         return;
101     }
102     QTextStream t( &file );
103     t << editField->text();
104     file.close();
105
106     setCaption( fileName );
107
108     statusBar()->message( QString( tr( "File %1 [nlb]
    saved" ) ).arg( fileName ),
109                           2000 );
110 }
111
112 /*
113  * Get the filename to save the file.
114  * Uses fileSave() for actually saving the file.
115  * Stores information whether HTML or plain text
116  * should be written.
117  */
118 void Editor::fileSaveAs()
119 {
120     QFileDialog * fileDialog = new QFileDialog(
121                                            ".",
122                                  QString::null,
123                                           this,
124                                 "saveasdialog",
125                                          TRUE );
126     fileDialog->setMode( QFileDialog::AnyFile );
127
128     QString htmlFilter = tr( "HTML files (*.html[nlb]
    *.htm)" );
129     fileDialog->addFilter( tr( "Text files [nlb]
    (*.txt)" ) );
130     fileDialog->addFilter( htmlFilter );
131     fileDialog->setCaption( tr( "Save As" ) );
132     fileDialog->exec();
133
134     fileName = fileDialog->selectedFile();
135
136     if ( fileDialog->selectedFilter() == [nlb]
    htmlFilter )
137         editField->setTextFormat( RichText );
138     else
139         editField->setTextFormat( PlainText );
140
141     if ( ! fileName.isEmpty() )
142         fileSave();
143     else
144         statusBar()->message( tr( "Saving [nlb]
    aborted" ),
145                               2000 );
146 }
147
148 /*
149  * What happens when a window close event occurs?
150  */
151 void Editor::closeEvent( QCloseEvent * close )
152 {
153     if ( saveAndContinue( tr( "Closing [nlb]
    aborted" ) ) )
154         close->accept();
155     else
156         close->ignore();
157 }
158
159 /*
160  * Ask user to save the old file or to cancel the
161  * operation.
162  */
163 bool Editor::saveAndContinue( [nlb]
    QString abortMessage )
164 {
165     if ( ! fileName.isEmpty() ||
166          ! editField->text().isEmpty() ){
167         switch( QMessageBox::information(   this,
168                                         fileName,
169      QString( tr( "Save %1?" ) ).arg( fileName ),
170                                      tr( "Yes" ),
171                                       tr( "No" ),
172                               tr( "Cancel" ) ) ){
173         case 0: if ( ! fileName.isEmpty() )
174                     fileSave();
175                 else
176                     fileSaveAs();
177                 return TRUE;
178                 break;
179         case 1: statusBar()->message( QString( [nlb]
    tr( "%1 not saved" ) ).arg(fileName),
180                                       2000 );
181                 return TRUE;
182                 break;
183         case 2: statusBar()->message( [nlb]
    abortMessage,
184                                       2000 );
185                 return FALSE;
186                 break;
187         default: return FALSE;
188         }
189     } else {
190         return TRUE;
191     }
192 }