C++ BGridLayout::SetExplicitAlignment方法代码示例

//.........这里部分代码省略.........
		/* Panic! */
		fLastError = B_NO_MEMORY;
		return;
	}
	
	
	fCalendarModuleLabel = new BStringView( BRect( 0, 0, 1, 1 ),
														 "label for the calendar module selector",
														 "Calendar:" );
	if ( !fCalendarModuleLabel ) {
		/* Panic! */
		fLastError = B_NO_MEMORY;
		return;
	}
	fCalendarModuleLabel->ResizeToPreferred();
	
	fCalendarsMenu = CreateMenuOfCalendarModules();
	if ( !fCalendarsMenu ) {
		/* Panic! */
		fLastError = B_NO_MEMORY;
		return;
	}
	
	fCalendarModuleSelector = new BMenuField( BRect( 0, 0, 1, 1 ),
															"calendar module selector",
															NULL,		// Label is created separately
															fCalendarsMenu );
	if ( !fCalendarModuleSelector ) {
		/* Panic! */
		fLastError = B_NO_MEMORY;
		return;
	}
	fCalendarModuleSelector->ResizeToPreferred();
	
	// Create the menu
	CreateMenu();
	
	BRect stringViewFrame = fLabel->Frame();
	
	BPoint topLeftCorner = stringViewFrame.RightTop();
	BSize size( BUTTON_WIDTH, stringViewFrame.Height() + SPACING );
	
	
	fMenuBar = new BMenuBar( BRect(topLeftCorner, size),
								"menuBar",
								B_FOLLOW_RIGHT | B_FOLLOW_TOP,
								B_ITEMS_IN_ROW,
								false);
	if (! fMenuBar) {
		// Panic!
		fLastError = B_NO_MEMORY;
		return;
	}
	fMenuBar->SetBorder( B_BORDER_EACH_ITEM );
	fMenuBar->AddItem( fDateSelector );

	// Update the selected date label to currently selected moment of time
	UpdateText();
	
	// Initializing the layout
	BGridLayout* lay = new BGridLayout( );
	
	if (!lay) { 
		// Panic! 
		fLastError = B_NO_MEMORY;
		return; 
	}
	lay->SetInsets(0, 5, 0, 0);
	lay->SetSpacing( 10, 5 );
	lay->SetExplicitAlignment( BAlignment( B_ALIGN_USE_FULL_WIDTH, B_ALIGN_MIDDLE ) );
	this->SetLayout(lay);
	
	BLayoutItem* layoutItem;
	
	layoutItem = lay->AddView( fLabel, 0, 0 );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_LEFT, B_ALIGN_TOP ) );
	layoutItem = lay->AddView( fDateLabel, 1, 0 );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_USE_FULL_WIDTH, B_ALIGN_TOP ) );
	layoutItem = lay->AddView( fMenuBar, 2, 0 );	
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_RIGHT, B_ALIGN_TOP ) );
	layoutItem->SetExplicitMaxSize( size );
	
	layoutItem = lay->AddView( fCalendarModuleLabel, 0, 1 );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_LEFT, B_ALIGN_MIDDLE ) );
	
	layoutItem = lay->AddView( fCalendarModuleSelector, 1, 1 );
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_USE_FULL_WIDTH, B_ALIGN_TOP ) );

	lay->SetColumnWeight( 0, 0 );
	lay->SetColumnWeight( 1, 1000 );
	lay->SetColumnWeight( 2, 0 );
	
	lay->SetMaxColumnWidth( 2, BUTTON_WIDTH );
	
	this->InvalidateLayout();
	this->Relayout();
	this->Invalidate();
	
	fLastError = B_OK;
}

/*!	\brief			Constructor of CategoryPreferencesView
 *	\details		It's a descendant of BView.
 *	\param[in]	frame	The frame rectangle of the view.
 */
CategoryPreferencesView::CategoryPreferencesView( BRect frame )
	:
	BView( frame,
		   "Category Preferences",
		   B_FOLLOW_ALL_SIDES,
		   B_WILL_DRAW | B_FRAME_EVENTS | B_NAVIGABLE )
{
	BLayoutItem* layoutItem = NULL;
	BMessage* toSend = NULL;
	menuField = NULL;
	
	this->SetViewColor( ui_color( B_PANEL_BACKGROUND_COLOR ) );
	
	/*!	\note	Layout of the view
	 *			The view has a grid layout. It's arranged in the following way:
	 *			1)	Left column - list of Categories (CategoryList) that
	 *				contains all categories currently available.
	 *			2) 	Right column - three buttons, from top to bottom:
	 *				2a)	Edit currently selected category - guess what it's doing
	 *				2b) Add a new category
	 *				2c)	Merge a current directory into another one + menu with
	 *					all categories. The category selected in the list is disabled.
	 * \note	Restrictions:
	 *			a) The list of categories is scrolled.
	 *			b) If no category is selected, then
	 *				i) 	"Edit" button is disabled
	 *				ii)	"Merge to" field is disabled
	 *			
	 */
	BGridLayout* gridLayout = new BGridLayout();
	if ( !gridLayout )
	{
		/* Panic! */
		exit( 1 );
	}
	// Margins from the sides of the view and spacing between the elements
	gridLayout->SetInsets( 5, 5, 5, 5 );
	gridLayout->SetHorizontalSpacing( 10 );
	gridLayout->SetVerticalSpacing( 10 );
	this->SetLayout( gridLayout );
	gridLayout->SetExplicitAlignment( BAlignment( B_ALIGN_USE_FULL_WIDTH, B_ALIGN_USE_FULL_HEIGHT ) );
	gridLayout->SetExplicitMinSize( BSize( (this->Bounds()).Width(), (this->Bounds()).Height() ) );
	

	BRect rect = gridLayout->Frame();
	printf ( "The frame is %d pixels wide and %d pixels high.\n",
			 (int )rect.Width(),
			 (int )rect.Height() );
	
	
	/* Creating the CategoryListView with its scroller */
	BRect r( this->Bounds() );
	r.InsetBySelf( 5, 10 );	// Margins near the border of the view
	r.right = (int)(r.right / 2) - B_V_SCROLL_BAR_WIDTH;
	r.bottom -= 0;
	
	listView = new CategoryListView( r, "List View" );
	if ( ! listView ) {
		/* Panic! */
		exit( 1 );
	}
	BLooper* looper = this->Looper();
	if ( looper && looper->LockLooper() )
	{
		looper->AddHandler( ( BHandler* )this );
		looper->UnlockLooper();	
	}
	
	scroller = new BScrollView( "Scroller",
								listView,
								B_FOLLOW_LEFT | B_FOLLOW_TOP,
								0, 	// Flags
								true,
								true );
	if ( !scroller )
	{
		/* Panic! */
		exit( 1 );
	}
	layoutItem = gridLayout->AddView( scroller, 0, 0, 1, 3 );
	if ( !layoutItem ) {
		/* Panic! */
		exit( 1 );
	}
	layoutItem->SetExplicitAlignment( BAlignment( B_ALIGN_LEFT,
												  B_ALIGN_USE_FULL_HEIGHT ) );
	toSend = new BMessage( kCategoryInvoked );
	if ( !toSend )
	{
		/* Panic! */
		exit( 1 );
	}
	listView->SetInvocationMessage( toSend );
	toSend = new BMessage( kCategorySelected );
	if ( !toSend )
	{
//.........这里部分代码省略.........

MediaConverterWindow::MediaConverterWindow(BRect frame)
	:
	BWindow(frame, B_TRANSLATE_SYSTEM_NAME("MediaConverter"), B_TITLED_WINDOW_LOOK,
		B_NORMAL_WINDOW_FEEL, B_NOT_ZOOMABLE | B_ASYNCHRONOUS_CONTROLS | 
		B_AUTO_UPDATE_SIZE_LIMITS),
	fVideoQuality(75),
	fAudioQuality(75),
	fSaveFilePanel(NULL),
	fOpenFilePanel(NULL),
	fOutputDirSpecified(false),
	fEnabled(true),
	fConverting(false),
	fCancelling(false)
{
	BPath outputDir;
	if (find_directory(B_USER_DIRECTORY, &outputDir) != B_OK)
		outputDir.SetTo("/boot/home");	
	fOutputDir.SetTo(outputDir.Path());

	fMenuBar = new BMenuBar("menubar");
	_CreateMenu();

	fListView = new MediaFileListView();
	fListView->SetExplicitMinSize(BSize(100, B_SIZE_UNSET));
	BScrollView* scroller = new BScrollView(NULL, fListView, 0, false, true);

	// file list view box
	fSourcesBox = new BBox(B_FANCY_BORDER, scroller);
	fSourcesBox->SetLayout(new BGroupLayout(B_HORIZONTAL, 0));
	// We give fSourcesBox a layout to provide insets for the sources list
	// said insets are adjusted in _UpdateLabels

	fInfoView = new MediaFileInfoView();
	fInfoBox = new BBox(B_FANCY_BORDER, fInfoView);
	fInfoBox->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));

	float padding = be_control_look->DefaultItemSpacing();

	// Output format box
	fOutputBox = new BBox(B_FANCY_BORDER, NULL);
	BGridLayout* outputGrid = new BGridLayout(padding, padding);
	fOutputBox->SetLayout(outputGrid);
		// fOutputBox's layout is also adjusted in _UpdateLabels
	outputGrid->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));
	fOutputBox->SetExplicitMaxSize(BSize(B_SIZE_UNLIMITED, B_SIZE_UNLIMITED));

	fFormatMenu = new BMenuField(NULL, B_TRANSLATE("File format:"), 
		new BPopUpMenu(""));
	fAudioMenu = new BMenuField(NULL, B_TRANSLATE("Audio encoding:"), 
		new BPopUpMenu(""));
	fVideoMenu = new BMenuField(NULL, B_TRANSLATE("Video encoding:"), 
		new BPopUpMenu(""));

	// output folder
	fDestButton = new BButton(B_TRANSLATE("Output folder"),
		new BMessage(OUTPUT_FOLDER_MESSAGE));
	BAlignment labelAlignment(be_control_look->DefaultLabelAlignment());
	fOutputFolder = new BStringView(NULL, outputDir.Path());
	fOutputFolder->SetExplicitAlignment(labelAlignment);

	// start/end duration
	fStartDurationTC = new BTextControl(NULL, NULL, NULL);
	fStartDurationTC->SetText("0");

	fEndDurationTC = new BTextControl(NULL, NULL, NULL);
	fEndDurationTC->SetText("0");

	// Video Quality
	fVideoQualitySlider = new BSlider("VSlider", "" ,
		new BMessage(VIDEO_QUALITY_CHANGED_MESSAGE), 1, 100, B_HORIZONTAL);
	fVideoQualitySlider->SetValue(fVideoQuality);
	fVideoQualitySlider->SetEnabled(false);

	// Audio Quality
	fAudioQualitySlider = new BSlider("ASlider", "" ,
		new BMessage(AUDIO_QUALITY_CHANGED_MESSAGE), 1, 100, B_HORIZONTAL);
	fAudioQualitySlider->SetValue(fAudioQuality);
	fAudioQualitySlider->SetEnabled(false);

	BLayoutBuilder::Grid<>(outputGrid)
		.SetInsets(padding, padding, padding, padding)
		.AddMenuField(fFormatMenu, 0, 0)
		.AddMenuField(fAudioMenu, 0, 1)
		.AddMenuField(fVideoMenu, 0, 2)
		.Add(fDestButton, 0, 3)
		.Add(fOutputFolder, 1, 3)
		.AddTextControl(fStartDurationTC, 0, 4)
		.AddTextControl(fEndDurationTC, 0, 5)
		.Add(fVideoQualitySlider, 0, 6, 2, 1)
		.Add(fAudioQualitySlider, 0, 7, 2, 1);

	// buttons
	fPreviewButton = new BButton(B_TRANSLATE("Preview"),
		new BMessage(PREVIEW_MESSAGE));
	fPreviewButton->SetEnabled(false);

	fConvertButton = new BButton(B_TRANSLATE("Convert"),
		new BMessage(CONVERT_BUTTON_MESSAGE));
//.........这里部分代码省略.........