Lesson 10:ファイルに保存する(1)

/**** ファイル名 : MainWindow.h ****/

#ifndef MAINWINDOW 
#define MAINWINDOW 
//--------------------------------------------------------------------- 
#include <Be.h> 
#include "BMemoView.h" 
//--------------------------------------------------------------------- 
#define MAINWINDOW_TITLE            "BTinyEditor" 
#define MAINWINDOW_POSITION_LEFT    100 
#define MAINWINDOW_POSITION_TOP     100 
#define MAINWINDOW_POSITION_WIDTH   600 
#define MAINWINDOW_POSITION_HEIGHT  400 
#define MAINWINDOW_WINDOWSTYLE      (B_DOCUMENT_WINDOW) 
//--------------------------------------------------------------------- 
#define MSG_OPEN    'mopn' 
#define MSG_SAVE    'msav' 
#define MSG_SAVEAS  'msva' 
//--------------------------------------------------------------------- 
class BEditorView : public BView 
{ 
public: 
    BMemoView *memo; 
    BEditorView(BRect frame); 
}; 
//--------------------------------------------------------------------- 
class BEditorWindow : public BWindow 
{ 
private:
    BFilePanel *save_filepanel;
public: 
    BEditorView *mainview; 
    //----------------------------------------------------------------- 
    BEditorWindow(BRect frame,const char *title); 
    ~BEditorWindow();
    virtual void MessageReceived(BMessage *msg); 
    void OpenFile(BEntry *entry);
    //----------------------------------------------------------------- 
    bool QuitRequested() 
    { 
        be_app->PostMessage(B_QUIT_REQUESTED); 
        return true; 
    }; 
}; 
//--------------------------------------------------------------------- 
#endif 

/**** ファイル名 : MainWindow.cpp ****/

//--------------------------------------------------------------------- 
BEditorWindow::BEditorWindow(BRect frame,const char *title) 
    :BWindow(frame,title,MAINWINDOW_WINDOWSTYLE,0) 
{ 
    mainview=new BEditorView(Bounds());    
    AddChild(mainview);
    save_filepanel=new BFilePanel(B_SAVE_PANEL);
} 
//--------------------------------------------------------------------- 
BEditorWindow::~BEditorWindow()
{
    delete save_filepanel;
} 
//--------------------------------------------------------------------- 
void BEditorWindow::MessageReceived(BMessage *msg) 
{ 
    switch(msg->what) 
    { 
        case B_UNDO: 
        case B_COPY: 
        case B_CUT: 
        case B_PASTE: 
        case B_SELECT_ALL: 
            ((BMemoView *)FindView("memo"))->MessageReceived(msg); 
            break; 
        case MSG_SAVE: 
            break; 
        case MSG_SAVEAS:
            save_filepanel->SetTarget(this);
            save_filepanel->Show(); 
            break;
        case B_SAVE_REQUESTED:
            BAlert *altmsg = new BAlert("Message", 
                                        "B_SAVE_REQUESTED","OK"); 
            altmsg->Go();
            break;        
        default: 
            BWindow::MessageReceived(msg); 
    } 
}
//--------------------------------------------------------------------- 

/**** ファイル名 : MainWindow.cpp ****/

//--------------------------------------------------------------------- 
void BEditorWindow::SaveFile(BEntry *entry)
{
    BFile fil;
    off_t wsize;
    off_t tsize;
    bool errflg;

    try
    {
        fil.SetTo(entry,B_READ_WRITE | B_CREATE_FILE);
        tsize=strlen(((BTextView *)FindView("memo"))->Text());
        wsize=fil.WriteAt(0,((BTextView *)FindView("memo"))->Text(),
                          tsize);
        
        errflg=(tsize!=wsize);
    }
    catch(...)
    {
        errflg=true;
    }

    if(errflg)
    {
        BAlert *altmsg = new BAlert("Error", "File write failed!!","OK",
                                     NULL,NULL,B_WIDTH_AS_USUAL,
                                     B_WARNING_ALERT); 
        altmsg->Go();
    }
}
//--------------------------------------------------------------------- 

/**** ファイル名 : MainWindow.cpp ****/

//--------------------------------------------------------------------- 
void BEditorWindow::OpenFile(BEntry *entry)
{
    if(entry->Exists())
    {
        BFile fil;
        off_t size;
        
        try
        {
            fil.SetTo(entry,B_READ_ONLY);
            fil.GetSize(&size);
            ((BTextView *)FindView("memo"))->SetText(&fil,0,size);
        }
        catch(...)
        {
            BAlert *altmsg = new BAlert("Error", 
                                        "File read failed!!","OK",
                                        NULL,NULL,B_WIDTH_AS_USUAL,
                                        B_WARNING_ALERT); 
            altmsg->Go();
        }
    }
}
//--------------------------------------------------------------------- 

/**** ファイル名 : MainWindow.cpp ****/

        case B_SAVE_REQUESTED:
            {
                entry_ref ref;
                BString nam;
                BDirectory dir;
                BEntry entry;

                msg->FindRef("directory",&ref);
                msg->FindString("name",&nam);
                dir.SetTo(&ref);

                if(entry.SetTo(&dir,nam.String())==B_OK)
                {
                    SaveFile(&entry);
                    return;
                }
            }
            break;