C++ BCheckBox::Bounds方法代码示例

//.........这里部分代码省略.........
	BBox*	enclosingBox = new BBox( frame, "Weekend selector" );
	if ( !enclosingBox )
	{
		/* Panic! */
		exit(1);
	}
	enclosingBox->SetLabel( "Select the non-working days (weekends)" );

	// Prepare the layout to be used
	BGridLayout* layout = new BGridLayout();
	if ( !layout)
	{
		/* Panic! */
		exit(1);
	}	
	enclosingBox->SetLayout( layout );
	layout->SetInsets( 10, 15, 10, 5 );
	layout->SetVerticalSpacing( 1 );
	
	/* indexX is 0 for left column or 1 for right column.
	 * indexY is 0 for topmost row, 1 for second from top row, etc.
	 * Max value for indexY = (ceiling of (N/2)).
	 */
	int indexX = 0, indexY = 0;
	
	for (uint32 day = prefs->GetFirstDayOfWeek(), i = 0; i < ( uint32 )daysInWeek; ++i )
	{
		/* Creating the message to be sent */
		toSend = new BMessage( kCalendarModuleWeekendDaySelected );
		if ( !toSend )
		{
			/* Panic! */
			exit(1);
		}
		toSend->AddInt32( "Weekday const", day );
		toSend->AddString( "Calendar module", id );

		/* Set the name of the checkbox.
		 * This is used to identify if the checkbox was checked or unchecked.
		 */
		tempString.SetTo( "Weekday" );
		tempString << day;
		
		/* Creating the checkbox */
		dayCheckBox = new BCheckBox( BRect(0, 0, 1, 1),
									 tempString.String(),
									 weekdayNames[ day ].longName.String(),
									 toSend );
		if (!dayCheckBox)
		{
			// Panic!
			exit(1);
		}
		dayCheckBox->ResizeToPreferred();
		
		// Check if the checkbox should be checked
		if ( weekends->HasItem( ( void* )day ) ) {
			dayCheckBox->SetValue( 1 );
		} else {
			dayCheckBox->SetValue( 0 );
		}
		
		/* Adding the item to the BBox */
		layoutItem = layout->AddView( dayCheckBox, indexX, indexY );
		if ( layoutItem )
		{
			layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_LEFT, B_ALIGN_TOP ) );
//			layoutItem->SetExplicitMaxSize( BSize( (int )dayCheckBox->Bounds().Width(), (int )dayCheckBox->Bounds().Height() ) );
			layout->SetMaxRowHeight( indexY, (int )dayCheckBox->Bounds().Height() + 10 );
			layout->SetRowWeight( indexY, 0 );
		}
		
		/* Advancing to the next cell in grid */
		// If arrived to the last item in the first column, advancing to second
		// The +1 is needed because i starts from 0, but days are starting from 1
		if ( ( i + 1 ) == ( unsigned int )( ( daysInWeek + 1 ) / 2 ) )
		{
			indexX = 1;	
			indexY = 0;
		}
		else 	// Staying in the same column, but advancing down
		{
			++indexY;	
		}
		
		/* Advancing to the next day */
		( day == daysInWeek ) ? day = kSunday : ++day;
		
	}	// <-- end of "for (all days in week)"
	
	// Resizing the BBox to the correct size.
	// Note: dayCheckBox is surely not NULL; if it were, we would exit earlier.
	height =(int )( ( dayCheckBox->Bounds().Height() + 5           ) * ( int )( ( daysInWeek + 1 ) / 2 ) - 5 );
	// Formula:	    ( ^height of one checkbox^       + ^separator^ ) * ( ^number of days in column^      ) - ^one unneeded extra separator^
	
	enclosingBox->ResizeTo( enclosingBox->Bounds().Width() - 10, ( int )height );
//	layout->SetExplicitMaxSize( BSize( enclosingBox->Bounds().Width() - 5, ( int )height + 25 ) );
	
	return enclosingBox;
}