Problem:
My app can open multiple databases, so I've decided to display
database name in app title. There is a category trigger on the same line.
Now imagine a database name being rather long, and a user selecting a
new category, which is also long. When displayed, this category name
is drawn over the title, cutting off it's right part. Then they selet a next
category which is shorter. The title line contains garbage.
To avoid this, I decided to truncate title with ellipses each time
a new category is selected.
Initially, I wrote it as
static void fixTitle( void )
{
RectangleType r;
FrmGetObjectBounds( frmP, FrmGetObjectIndex( frmP,
ListCategoryPopTrigger ), &r );
RctSetRectangle( &r, 0, 0, r.topLeft.x, 13 );
FntSetFont( boldFont );
if( FrmVisible(frmP) ) FrmEraseForm( frmP );
FrmDrawForm( frmP );
WinEraseRectangle( &r, 3 );
WinGlueDrawTruncChars(gPref.dbName, StrLen(gPref.dbName), 2, 0,
r.extent.x-2);
WinInvertRectangle( &r, 3 );
}
It works fine on black&white models, but under OS3.5 it looks
ugly because of WinInvertRectangle...
So my final solution was
static char strTitle[dmDBNameLength];
...
RectangleType r; Int16 w,len;
FrmGetObjectBounds( frmP, FrmGetObjectIndex( frmP,
ListCategoryPopTrigger ), &r );
FntSetFont( boldFont );
w=r.topLeft.x-4;
StrCopy( strTitle, gPref.dbName );
if( FntCharsWidth(gPref.dbName,(len=StrLen(gPref.dbName))) > w )
{
Boolean trunc; Char chel; ChrHorizEllipsis(&chel);
w -= FntCharWidth(chel);
FntCharsInWidth( gPref.dbName, &w, &len, &trunc );
strTitle[len]=chel; strTitle[len+1]=0;
}
if( FrmVisible(frmP) ) FrmEraseForm( frmP );
FrmSetTitle( frmP, strTitle );
FrmDrawForm( frmP );
This works fine under OS3.5, but is very slow...
Ivan
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