C++ BAlignment函数代码示例

    TableDemoWindow(BRect frame)
        : BWindow(frame, "ALM Table Demo", B_TITLED_WINDOW, B_QUIT_ON_WINDOW_CLOSE)
    {
        // create a new BALMLayout and use  it for this window
        BALMLayout* layout = new BALMLayout();
        SetLayout(layout);

        Column* c1 = layout->AddColumn(layout->Left(), layout->Right());
        Row* r1 = layout->AddRow(layout->Top(), NULL);
        Row* r2 = layout->AddRow(r1->Bottom(), NULL);
        Row* r3 = layout->AddRow(r2->Bottom(), layout->Bottom());

        BButton* b1 = new BButton("A1");
        layout->AddView(b1, r1, c1);
        b1->SetExplicitAlignment(BAlignment(B_ALIGN_LEFT, B_ALIGN_TOP));

        BButton* b2 = new BButton("A2");
        layout->AddView(b2, r2, c1);
        b2->SetExplicitAlignment(BAlignment(
                                     B_ALIGN_HORIZONTAL_CENTER, B_ALIGN_VERTICAL_CENTER));

        BButton* b3 = new BButton("A3");
        layout->AddView(b3, r3, c1);
        b3->SetExplicitAlignment(BAlignment(B_ALIGN_RIGHT, B_ALIGN_BOTTOM));

        // test size limits
        BSize min = layout->MinSize();
        BSize max = layout->MaxSize();
        SetSizeLimits(min.Width(), max.Width(), min.Height(), max.Height());
    }

	ThreeButtonsWindow(BRect frame) 
		:
		BWindow(frame, "ALM Three Buttons", B_TITLED_WINDOW,
			B_QUIT_ON_WINDOW_CLOSE)
	{
		BButton* button1 = new BButton("A");
		BButton* button2 = new BButton("B");
		BButton* button3 = new BButton("C");

		button1->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));
		button1->SetExplicitMaxSize(BSize(500, 50));

		button2->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));
		button2->SetExplicitMaxSize(BSize(500, 500));

		button3->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));
		button3->SetExplicitMaxSize(BSize(500, 500));

		// create a new BALMLayout and use  it for this window
		fLayout = new BALMLayout();
		SetLayout(fLayout);
		
		fLayout->AddView(button1, fLayout->Left(), fLayout->Top(),
			fLayout->Right(), NULL);
		fLayout->AddViewToBottom(button2);
		fLayout->AddViewToBottom(button3, fLayout->Bottom());

		// test size limits
		BSize min = fLayout->MinSize();
		BSize max = fLayout->MaxSize();
		SetSizeLimits(min.Width(), max.Width(), min.Height(), max.Height());
	}

LookAndFeelSettingsView::LookAndFeelSettingsView(const char* name)
	:
	BView(name, 0),
	fDecorInfoButton(NULL),
	fDecorMenuField(NULL),
	fDecorMenu(NULL)
{
	// Decorator menu
	_BuildDecorMenu();
	fDecorMenuField = new BMenuField("decorator",
		B_TRANSLATE("Decorator:"), fDecorMenu);

	fDecorInfoButton = new BButton(B_TRANSLATE("About"),
		new BMessage(kMsgDecorInfo));

	// scroll bar arrow style
	BBox* arrowStyleBox = new BBox("arrow style");
	arrowStyleBox->SetLabel(B_TRANSLATE("Arrow style"));

	fSavedDoubleArrowsValue = _DoubleScrollBarArrows();

	fArrowStyleSingle = new FakeScrollBar(true, false,
		new BMessage(kMsgArrowStyleSingle));
	fArrowStyleDouble = new FakeScrollBar(true, true,
		new BMessage(kMsgArrowStyleDouble));

	BView* arrowStyleView;
	arrowStyleView = BLayoutBuilder::Group<>()
		.AddGroup(B_VERTICAL, 1)
			.Add(new BStringView("single", B_TRANSLATE("Single:")))
			.Add(fArrowStyleSingle)
			.AddStrut(B_USE_DEFAULT_SPACING)
			.Add(new BStringView("double", B_TRANSLATE("Double:")))
			.Add(fArrowStyleDouble)
			.SetInsets(B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING,
				B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING)
			.End()
		.View();
	arrowStyleBox->AddChild(arrowStyleView);
	arrowStyleBox->SetExplicitAlignment(BAlignment(B_ALIGN_LEFT,
		B_ALIGN_VERTICAL_CENTER));
	arrowStyleBox->SetExplicitMaxSize(BSize(B_SIZE_UNLIMITED, B_SIZE_UNSET));

	BStringView* scrollBarLabel
		= new BStringView("scroll bar", B_TRANSLATE("Scroll bar:"));
	scrollBarLabel->SetExplicitAlignment(
		BAlignment(B_ALIGN_LEFT, B_ALIGN_TOP));

	// control layout
	BLayoutBuilder::Grid<>(this, B_USE_DEFAULT_SPACING, B_USE_DEFAULT_SPACING)
		.Add(fDecorMenuField->CreateLabelLayoutItem(), 0, 0)
		.Add(fDecorMenuField->CreateMenuBarLayoutItem(), 1, 0)
		.Add(fDecorInfoButton, 2, 0)
		.Add(scrollBarLabel, 0, 1)
		.Add(arrowStyleBox, 1, 1)
		.AddGlue(0, 2)
		.SetInsets(B_USE_WINDOW_SPACING);

	// TODO : Decorator Preview Image?
}

	ThreeButtonsWindow(BRect frame) 
		:
		BWindow(frame, "ALM Three Buttons", B_TITLED_WINDOW,
			B_QUIT_ON_WINDOW_CLOSE)
	{
		BButton* button1 = new BButton("A");
		BButton* button2 = new BButton("B");
		BButton* button3 = new BButton("C");

		button1->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));
		button1->SetExplicitMaxSize(BSize(500, 50));

		button2->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));
		button2->SetExplicitMaxSize(BSize(500, 500));

		button3->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
			B_ALIGN_USE_FULL_HEIGHT));
		button3->SetExplicitMaxSize(BSize(500, 500));

		fLayout = new BALMLayout(0, 0);
		BALM::BALMLayoutBuilder(this, fLayout)
			.Add(button1, fLayout->Left(), fLayout->Top(), fLayout->Right())
			.StartingAt(button1)
				.AddBelow(button2)
				.AddBelow(button3, fLayout->Bottom());

		// test size limits
		BSize min = fLayout->MinSize();
		BSize max = fLayout->MaxSize();
		SetSizeLimits(min.Width(), max.Width(), min.Height(), max.Height());
	}

CamStatusView::CamStatusView(Controller* controller)
	:
	BView("CamStatusView", B_WILL_DRAW|B_PULSE_NEEDED),
	fController(controller),
	fStringView(NULL),
	fBitmapView(NULL),
	fEncodingStringView(NULL),
	fStatusBar(NULL),
	fNumFrames(0),
	fRecording(false),
	fPaused(false),
	fRecordingBitmap(NULL),
	fPauseBitmap(NULL)
{
	BCardLayout* cardLayout = new BCardLayout();
	SetLayout(cardLayout);
	BRect bitmapRect(0, 0, kBitmapSize, kBitmapSize);
	fRecordingBitmap = new BBitmap(bitmapRect, B_RGBA32);
	fPauseBitmap = new BBitmap(bitmapRect, B_RGBA32);
	
	BView* statusView = BLayoutBuilder::Group<>()
		.SetInsets(0)
		.Add(fEncodingStringView = new BStringView("stringview", kEncodingString))
		.Add(fStatusBar = new BStatusBar("", ""))
		.View();

	fStatusBar->SetExplicitMinSize(BSize(100, 20));

	BView* layoutView = BLayoutBuilder::Group<>()
		.SetInsets(0)
		.Add(fBitmapView = new SquareBitmapView("bitmap view"))
		.Add(fStringView = new BStringView("cam string view", ""))
		.View();

	cardLayout->AddView(layoutView);
	cardLayout->AddView(statusView);
	
	fBitmapView->SetBitmap(NULL);
	
	BFont font;
	GetFont(&font);
	float scaledSize = kBitmapSize * (capped_size(font.Size()) / 12);
	fBitmapView->SetExplicitMinSize(BSize(scaledSize, scaledSize));
	fBitmapView->SetExplicitMaxSize(BSize(scaledSize, scaledSize));
	fBitmapView->SetExplicitAlignment(BAlignment(B_ALIGN_LEFT, B_ALIGN_TOP));
	
	fStringView->SetExplicitAlignment(BAlignment(B_ALIGN_LEFT, B_ALIGN_MIDDLE));
	
	cardLayout->SetVisibleItem(int32(0));
}

void
BButton::Draw(BRect updateRect)
{
	BRect rect(Bounds());
	rgb_color background = LowColor();
	rgb_color base = background;
	uint32 flags = be_control_look->Flags(this);
	if (_Flag(FLAG_DEFAULT))
		flags |= BControlLook::B_DEFAULT_BUTTON;
	if (_Flag(FLAG_FLAT) && !IsTracking())
		flags |= BControlLook::B_FLAT;
	if (_Flag(FLAG_INSIDE))
		flags |= BControlLook::B_HOVER;

	be_control_look->DrawButtonFrame(this, rect, updateRect,
		base, background, flags);

	if (fBehavior == B_POP_UP_BEHAVIOR) {
		be_control_look->DrawButtonWithPopUpBackground(this, rect, updateRect,
			base, flags);
	} else {
		be_control_look->DrawButtonBackground(this, rect, updateRect,
			base, flags);
	}

	// always leave some room around the label
	rect.InsetBy(kLabelMargin, kLabelMargin);

	const BBitmap* icon = IconBitmap(
		(Value() == B_CONTROL_OFF
				? B_INACTIVE_ICON_BITMAP : B_ACTIVE_ICON_BITMAP)
			| (IsEnabled() ? 0 : B_DISABLED_ICON_BITMAP));
	be_control_look->DrawLabel(this, Label(), icon, rect, updateRect,
		base, flags, BAlignment(B_ALIGN_CENTER, B_ALIGN_MIDDLE));
}

void
TTimeWindow::_InitWindow()
{
	SetPulseRate(500000);

	fDateTimeView = new DateTimeView(B_TRANSLATE("Date and time"));
	fTimeZoneView = new TimeZoneView(B_TRANSLATE("Time zone"));
	fNetworkTimeView = new NetworkTimeView(B_TRANSLATE("Network time"));
	fClockView = new ClockView(B_TRANSLATE("Clock"));

	fBaseView = new TTimeBaseView("baseView");
	fBaseView->StartWatchingAll(fDateTimeView);
	fBaseView->StartWatchingAll(fTimeZoneView);

	fTabView = new BTabView("tabView", B_WIDTH_FROM_WIDEST);
	fTabView->AddTab(fDateTimeView);
	fTabView->AddTab(fTimeZoneView);
	fTabView->AddTab(fNetworkTimeView);
	fTabView->AddTab(fClockView);

	fBaseView->AddChild(fTabView);

	fRevertButton = new BButton("revert", B_TRANSLATE("Revert"),
		new BMessage(kMsgRevert));
	fRevertButton->SetEnabled(false);
	fRevertButton->SetTarget(this);
	fRevertButton->SetExplicitAlignment(
		BAlignment(B_ALIGN_LEFT, B_ALIGN_MIDDLE));

	BLayoutBuilder::Group<>(this, B_VERTICAL)
		.SetInsets(B_USE_DEFAULT_SPACING)
		.Add(fBaseView)
		.Add(fRevertButton);
}

void
PersonView::UpdatePicture(BBitmap* bitmap)
{
	if (fPictureView == NULL) {
		fPictureView = new PictureView(70, 90, bitmap);

		GridLayout()->AddView(fPictureView, 0, 0, 1, 5);
		GridLayout()->ItemAt(0, 0)->SetExplicitAlignment(
			BAlignment(B_ALIGN_CENTER, B_ALIGN_TOP));

		return;
	}

	if (fSaving)
		return;
/*
	time_t modificationTime = 0;
	BEntry entry(ref);
	entry.GetModificationTime(&modificationTime);

	if (entry.InitCheck() == B_OK
		&& modificationTime <= fLastModificationTime) {
		return;
	}*/

	fPictureView->Update(bitmap);
}

PersonView::PersonView(const char* name, const char* categoryAttribute,
		const entry_ref *ref)
	:
	BGridView(),
	fLastModificationTime(0),
	fGroups(NULL),
	fControls(20, false),
	fCategoryAttribute(categoryAttribute),
	fPictureView(NULL),
	fSaving(false)
{
	SetName(name);
	SetFlags(Flags() | B_WILL_DRAW);

	fRef = ref;
	BFile* file = NULL;
	if (fRef != NULL)
		file = new BFile(fRef, B_READ_ONLY);

	// Add picture "field", using ID photo 35mm x 45mm ratio
	fPictureView = new PictureView(70, 90, ref);

	BGridLayout* layout = GridLayout();

	float spacing = be_control_look->DefaultItemSpacing();
	layout->SetInsets(spacing, spacing, spacing, spacing);

	layout->AddView(fPictureView, 0, 0, 1, 5);
	layout->ItemAt(0, 0)->SetExplicitAlignment(
		BAlignment(B_ALIGN_CENTER, B_ALIGN_TOP));

	if (file != NULL)
		file->GetModificationTime(&fLastModificationTime);
	delete file;
}

BAlignment
BAbstractSpinner::LayoutAlignment()
{
	_ValidateLayoutData();
	return BLayoutUtils::ComposeAlignment(ExplicitAlignment(),
		BAlignment(B_ALIGN_LEFT, B_ALIGN_VERTICAL_CENTER));
}

void
BToolTip::_InitData()
{
	fIsSticky = false;
	fRelativeLocation = BPoint(20, 20);
	fAlignment = BAlignment(B_ALIGN_RIGHT, B_ALIGN_BOTTOM);
}

BMenuField*
ModifierKeysWindow::_CreateCommandMenuField()
{
	fCommandMenu = new BPopUpMenu(
		B_TRANSLATE_NOCOLLECT(_KeyToString(MENU_ITEM_COMMAND)), true, true);

	for (int32 key = MENU_ITEM_SHIFT; key <= MENU_ITEM_DISABLED; key++) {
		if (key == MENU_ITEM_SEPERATOR) {
			// add separator item
			BSeparatorItem* separator = new BSeparatorItem;
			fCommandMenu->AddItem(separator, MENU_ITEM_SEPERATOR);
			continue;
		}

		BMessage* message = new BMessage(kMsgUpdateModifier);
		message->AddInt32(_KeyToString(MENU_ITEM_COMMAND), key);
		BMenuItem* item = new BMenuItem(
			B_TRANSLATE_NOCOLLECT(_KeyToString(key)), message);
		fCommandMenu->AddItem(item, key);
	}

	fCommandMenu->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
		B_ALIGN_VERTICAL_UNSET));

	return new BMenuField(B_TRANSLATE_COMMENT("Command:",
		"Command key role name"), fCommandMenu);
}

PreviewView::PreviewView()
	:
	BView("Rect View", B_WILL_DRAW),
	fBitmapView(NULL),
	fTop(NULL),
	fLeft(NULL),
	fRight(NULL),
	fBottom(NULL)
{
	fCoordRect = BRect(10, 10, 20, 20);
	fChanged = true;

	SetLayout(new BGroupLayout(B_HORIZONTAL));
	SetExplicitAlignment(BAlignment(B_ALIGN_HORIZONTAL_CENTER,
		B_ALIGN_VERTICAL_CENTER));
	AddChild(BGroupLayoutBuilder(B_VERTICAL)
		.AddGroup(B_HORIZONTAL)
			.Add(new BStringView("spacer", ""))
			.Add(fTop = new BStringView("top", "top"))
			.Add(new BStringView("spacer", ""))
		.End()
		.AddGroup(B_HORIZONTAL)
			.Add(fLeft = new BStringView("left", "left"))
			.Add(fBitmapView = new BitmapView())
			.Add(fRight = new BStringView("right", "right"))
		.End()
		.AddGroup(B_HORIZONTAL)
			.Add(new BStringView("spacer", ""))
			.Add(fBottom = new BStringView("bottom", "bottom"))
			.Add(new BStringView("spacer", ""))
		.End()
	);
}

ScreenSaverWindow::ScreenSaverWindow()
	:
	BWindow(BRect(50.0f, 50.0f, 50.0f + kWindowWidth, 50.0f + kWindowHeight),
		B_TRANSLATE_SYSTEM_NAME("ScreenSaver"), B_TITLED_WINDOW,
		B_ASYNCHRONOUS_CONTROLS | B_AUTO_UPDATE_SIZE_LIMITS)
{
	fSettings.Load();

	fMinWidth = floorf(be_control_look->DefaultItemSpacing()
		* (kWindowWidth / kDefaultItemSpacingAt12pt));

	font_height fontHeight;
	be_plain_font->GetHeight(&fontHeight);
	float textHeight = ceilf(fontHeight.ascent + fontHeight.descent);

	fMinHeight = ceilf(std::max(kWindowHeight, textHeight * 28));

	// Create the password editing window
	fPasswordWindow = new PasswordWindow(fSettings);
	fPasswordWindow->Run();

	// Create the tab view
	fTabView = new TabView();
	fTabView->SetBorder(B_NO_BORDER);

	// Create the controls inside the tabs
	fFadeView = new FadeView(B_TRANSLATE("General"), fSettings);
	fModulesView = new ModulesView(B_TRANSLATE("Screensavers"), fSettings);

	fTabView->AddTab(fFadeView);
	fTabView->AddTab(fModulesView);

	// Create the topmost background view
	BView* topView = new BView("topView", B_WILL_DRAW);
	topView->SetViewUIColor(B_PANEL_BACKGROUND_COLOR);
	topView->SetExplicitAlignment(BAlignment(B_ALIGN_USE_FULL_WIDTH,
		B_ALIGN_USE_FULL_HEIGHT));
	topView->SetExplicitMinSize(BSize(fMinWidth, fMinHeight));
	BLayoutBuilder::Group<>(topView, B_VERTICAL)
		.SetInsets(0, B_USE_DEFAULT_SPACING, 0, B_USE_WINDOW_SPACING)
		.Add(fTabView)
		.End();

	SetLayout(new BGroupLayout(B_VERTICAL));
	GetLayout()->AddView(topView);

	fTabView->Select(fSettings.WindowTab());

	if (fSettings.WindowFrame().left > 0 && fSettings.WindowFrame().top > 0)
		MoveTo(fSettings.WindowFrame().left, fSettings.WindowFrame().top);

	if (fSettings.WindowFrame().Width() > 0
		&& fSettings.WindowFrame().Height() > 0) {
		ResizeTo(fSettings.WindowFrame().Width(),
			fSettings.WindowFrame().Height());
	}

	CenterOnScreen();
}

Settings::Settings()
	:
	fMessage(kMsgDiskProbeSettings),
	fUpdated(false)
{
	float fontSize = be_plain_font->Size();
	int32 windowWidth = DataView::WidthForFontSize(fontSize) + 20;
		// TODO: make scrollbar width variable

	BScreen screen;
	fMessage.AddRect("window_frame", BLayoutUtils::AlignInFrame(screen.Frame(),
		BSize(windowWidth, windowWidth),
		BAlignment(B_ALIGN_HORIZONTAL_CENTER, B_ALIGN_VERTICAL_CENTER)));
	fMessage.AddInt32("base_type", kHexBase);
	fMessage.AddFloat("font_size", fontSize);
	fMessage.AddBool("case_sensitive", true);
	fMessage.AddInt8("find_mode", kAsciiMode);

	BFile file;
	if (Open(&file, B_READ_ONLY) != B_OK)
		return;

	// TODO: load/save settings as flattened BMessage - but not yet,
	//		since that will break compatibility with R5's DiskProbe

	disk_probe_settings settings;
	if (file.Read(&settings, sizeof(settings)) == sizeof(settings)) {
#if B_HOST_IS_BENDIAN
		// settings are saved in little endian
		settings.window_frame.left = B_LENDIAN_TO_HOST_FLOAT(
			settings.window_frame.left);
		settings.window_frame.top = B_LENDIAN_TO_HOST_FLOAT(
			settings.window_frame.top);
		settings.window_frame.right = B_LENDIAN_TO_HOST_FLOAT(
			settings.window_frame.right);
		settings.window_frame.bottom = B_LENDIAN_TO_HOST_FLOAT(
			settings.window_frame.bottom);
#endif
		// check if the window frame is on screen at all
		BScreen screen;
		if (screen.Frame().Contains(settings.window_frame.LeftTop())
			&& settings.window_frame.Width() < screen.Frame().Width()
			&& settings.window_frame.Height() < screen.Frame().Height())
			fMessage.ReplaceRect("window_frame", settings.window_frame);

		if (settings.base_type == kHexBase
			|| settings.base_type == kDecimalBase)
			fMessage.ReplaceInt32("base_type",
				B_LENDIAN_TO_HOST_INT32(settings.base_type));
		if (settings.font_size >= 0 && settings.font_size <= 72)
			fMessage.ReplaceFloat("font_size",
				float(B_LENDIAN_TO_HOST_INT32(settings.font_size)));

		fMessage.ReplaceBool("case_sensitive",
			settings.flags & kCaseSensitive);
		fMessage.ReplaceInt8("find_mode",
			settings.flags & kHexFindMode ? kHexMode : kAsciiMode);
	}
}