C++ BGridLayout::SetRowWeight方法代码示例

//.........这里部分代码省略.........
	layoutItem->SetExplicitMinSize( BSize( ( B_V_SCROLL_BAR_WIDTH * 2 ), r.Height() ) );
	gridLayout->SetMaxColumnWidth( 0, r.Width()-70 );
	gridLayout->SetMaxColumnWidth( 1, r.Width()-66 );
	
	// Add categories to the list
	PopulateCategoriesView();
	
	/* Creating the buttons */
	// Add new category button
	toSend = new BMessage( kAddNewCategory );
	addButton = new BButton( BRect( 0, 0, 1, 1), 
							 "Add category",
							 "Add category",
							 toSend,
							 B_FOLLOW_H_CENTER | B_FOLLOW_V_CENTER );
	if ( !toSend || !addButton ) {
		/* Panic! */
		exit( 1 );
	}
	addButton->ResizeToPreferred();
	addButton->SetTarget( this );
	layoutItem = gridLayout->AddView( addButton, 1, 0, 1, 1 );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_HORIZONTAL_CENTER, B_ALIGN_VERTICAL_CENTER ) );
	
	// Edit old category button
	toSend = new BMessage( kCategoryInvoked );
	editButton = new BButton( BRect( 0, 0, 1, 1), 
							 "Edit category",
							 "Edit category",
							 toSend,
							 B_FOLLOW_H_CENTER | B_FOLLOW_V_CENTER );
	if ( !toSend || !editButton ) {
		/* Panic! */
		exit( 1 );
	}
	editButton->ResizeToPreferred();
	editButton->SetTarget( this );
	layoutItem = gridLayout->AddView( editButton, 1, 1, 1, 1 );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_HORIZONTAL_CENTER, B_ALIGN_VERTICAL_CENTER ) );
	// Edit category button is disabled by default; 
	// it's enabled when user chooses a category in the list.
	editButton->SetEnabled( false );
	
	/* Creating the menu of merging a category */
	// Create a label
	BGroupLayout* groupLayout = new BGroupLayout( B_VERTICAL );
	if ( !groupLayout )
	{
		/* Panic! */
		exit( 1 );
	}
	gridLayout->AddItem( groupLayout, 1, 2, 1, 1 );
	groupLayout->SetExplicitAlignment( BAlignment( B_ALIGN_LEFT, B_ALIGN_TOP ) );
	
	mergeToLabel = new BStringView( BRect( 0, 0, 1, 1 ),
								"Merge to label",
								"Merge selected category into:" );
	if ( !mergeToLabel ) {
		/* Panic! */
		exit( 1 );
	}
	mergeToLabel->ResizeToPreferred();
	layoutItem = groupLayout->AddView( mergeToLabel );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_LEFT, B_ALIGN_TOP ) );
	
	// Create the menu
	BMessage templateMessage( kMergeIntoCategory );
	listMenu = new CategoryMenu( "Select category to merge to:", true, &templateMessage );
	if ( !listMenu )
	{
		/* Panic! */
		exit( 1 );
	}	
	
	menuField = new BMenuField( mergeToLabel->Bounds(),
								"Merge to field",
								NULL,
								listMenu );
	if ( !menuField ) {
		/* Panic! */
		exit( 1 );
	}
	menuField->SetDivider( 0 );
	// Just like the "Edit" button above, the menu is initially disabled.
	menuField->SetEnabled( false );
	
	layoutItem = groupLayout->AddView( menuField );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_USE_FULL_WIDTH, B_ALIGN_TOP ) );
	
	for ( int index = 0; index < gridLayout->CountColumns(); ++index )
	{
		gridLayout->SetColumnWeight( index, 1 );
	}
	for ( int index = 0; index < gridLayout->CountRows(); ++index )
	{
		gridLayout->SetRowWeight( index, 1 );	
	}
	gridLayout->InvalidateLayout();
	
}	// <-- end of constructor of CategoryPreferencesView

//.........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;
}