C++ GetFontHeight函数代码示例

// ---------------------------------------------------------------
// Draw
//
// Draws information about the SlideShowConfigTranslator to this view.
//
// Preconditions:
//
// Parameters: area,	not used
//
// Postconditions:
//
// Returns:
// ---------------------------------------------------------------
void
SlideShowConfigView::Draw(BRect area)
{
	SetFont(be_bold_font);
	font_height fh;
	GetFontHeight(&fh);
	float xbold, ybold;
	xbold = fh.descent + 1;
	ybold = fh.ascent + fh.descent * 2 + fh.leading;

	char title[] = "SlideShow Screen Saver";
	DrawString(title, BPoint(xbold, ybold));

	SetFont(be_plain_font);
	font_height plainh;
	GetFontHeight(&plainh);
	float yplain;
	yplain = plainh.ascent + plainh.descent * 2 + plainh.leading;

	char writtenby[] = "Written by Michael Wilber";
	DrawString(writtenby, BPoint(xbold, yplain * 1 + ybold));

	// Draw current folder
	BString strFolder;
	fSettings->GetString(SAVER_SETTING_DIRECTORY, strFolder);
	strFolder.Prepend("Image folder: ");
	DrawString(strFolder.String(), BPoint(10, yplain * 9 + ybold));
}

// Draw
void
ListLabelView::Draw(BRect updateRect)
{
	rgb_color base = ui_color(B_PANEL_BACKGROUND_COLOR);
	rgb_color lightenMax = tint_color(base, B_LIGHTEN_MAX_TINT);
	rgb_color darken2 = tint_color(base, B_DARKEN_2_TINT);

	BRect r(Bounds());

	BeginLineArray(3);
		AddLine(BPoint(r.left, r.bottom - 1),
				BPoint(r.left, r.top), lightenMax);
		AddLine(BPoint(r.right, r.top),
				BPoint(r.right, r.bottom), darken2);
		AddLine(BPoint(r.right - 1, r.bottom),
				BPoint(r.left, r.bottom), darken2);
	EndLineArray();

	r.left += 1;
	r.right -= 1;
	r.bottom -= 1;

	SetLowColor(base);
	FillRect(r & updateRect, B_SOLID_LOW);

	font_height fh;
	GetFontHeight(&fh);

	SetHighColor(0, 0, 0, 255);
	BPoint labelPos;
	labelPos.x = 5;
	labelPos.y = r.top + floorf((r.Height() + fh.ascent) / 2.0);
	DrawString(fLabel.String(), labelPos);
}

void
MonitorView::Draw(BRect updateRect)
{
	rgb_color darkColor = {160, 160, 160, 255};
	rgb_color blackColor = {0, 0, 0, 255};
	rgb_color redColor = {228, 0, 0, 255};
	rgb_color whiteColor = {255, 255, 255, 255};
	BRect outerRect = _MonitorBounds();

	SetHighColor(fBackgroundColor);
	FillRect(updateRect);

	SetDrawingMode(B_OP_OVER);

	// frame & background

	SetHighColor(darkColor);
	FillRoundRect(outerRect, 3.0, 3.0);

	SetHighColor(blackColor);
	StrokeRoundRect(outerRect, 3.0, 3.0);

	SetHighColor(fDesktopColor);

	BRect innerRect(outerRect.InsetByCopy(4, 4));
	FillRoundRect(innerRect, 2.0, 2.0);

	SetHighColor(blackColor);
	StrokeRoundRect(innerRect, 2.0, 2.0);

	SetDrawingMode(B_OP_COPY);

	// power light

	SetHighColor(redColor);
	BPoint powerPos(outerRect.left + 5, outerRect.bottom - 2);
	StrokeLine(powerPos, BPoint(powerPos.x + 2, powerPos.y));

	// DPI

	if (fDPI == 0)
		return;

	font_height fontHeight;
	GetFontHeight(&fontHeight);
	float height = ceilf(fontHeight.ascent + fontHeight.descent);

	char text[64];
	snprintf(text, sizeof(text), B_TRANSLATE("%ld dpi"), fDPI);

	float width = StringWidth(text);
	if (width > innerRect.Width() || height > innerRect.Height())
		return;

	SetLowColor(fDesktopColor);
	SetHighColor(whiteColor);

	DrawString(text, BPoint(innerRect.left + (innerRect.Width() - width) / 2,
		innerRect.top + fontHeight.ascent + (innerRect.Height() - height) / 2));
}

BSize
BButton::_ValidatePreferredSize()
{
	if (fPreferredSize.width < 0) {
		// width
		float width = 20.0f + (float)ceil(StringWidth(Label()));
		if (width < 75.0f)
			width = 75.0f;

		if (fDrawAsDefault)
			width += 6.0f;

		fPreferredSize.width = width;

		// height
		font_height fontHeight;
		GetFontHeight(&fontHeight);

		fPreferredSize.height
			= ceilf((fontHeight.ascent + fontHeight.descent) * 1.8)
				+ (fDrawAsDefault ? 6.0f : 0);

		ResetLayoutInvalidation();
	}

	return fPreferredSize;
}

//Kris:
//This is a new function which duplicates the older "yellow info boxes" that
//are common throughout the editor.  This draws the yellow box with the indentation
//look.
void DrawEditorInfoBox( UINT16 *str, UINT32 uiFont, UINT16 x, UINT16 y, UINT16 w, UINT16 h )
{
	UINT16 usFillColorDark, usFillColorLight, usFillColorBack;
	UINT16 x2, y2;
	UINT16 usStrWidth;

	x2 = x + w;
	y2 = y + h;

	usFillColorDark = Get16BPPColor(FROMRGB(24, 61, 81));
	usFillColorLight = Get16BPPColor(FROMRGB(136, 138, 135));
	usFillColorBack = Get16BPPColor(FROMRGB(250, 240, 188));

	ColorFillVideoSurfaceArea(ButtonDestBuffer, x, y, x2, y2, usFillColorDark);
	ColorFillVideoSurfaceArea(ButtonDestBuffer, x + 1, y + 1, x2, y2, usFillColorLight);
	ColorFillVideoSurfaceArea(ButtonDestBuffer, x + 1, y + 1, x2 - 1, y2 - 1, usFillColorBack);

	usStrWidth = StringPixLength( str, uiFont );
	if( usStrWidth > w )
	{ //the string is too long, so use the wrapped method
		y += 1;
		DisplayWrappedString( x, y, w, 2, uiFont, FONT_BLACK, str, FONT_BLACK, TRUE, CENTER_JUSTIFIED );
		return;
	}
	//center the string vertically and horizontally.
	SetFont( uiFont );
	SetFontForeground( FONT_BLACK );
	SetFontShadow( FONT_BLACK );
	x += (w - (UINT16)StringPixLength( str, uiFont )) / 2;
	y += (h - (UINT16)GetFontHeight( uiFont)) / 2;
	mprintf( x, y, L"%s", str );
	InvalidateRegion( x, y, x2, y2 );
}

void
BRadioButton::Draw(BRect updateRect)
{
	// its size depends on the text height
	font_height fontHeight;
	GetFontHeight(&fontHeight);

	rgb_color base = ui_color(B_PANEL_BACKGROUND_COLOR);

	uint32 flags = be_control_look->Flags(this);
	if (fOutlined)
		flags |= BControlLook::B_CLICKED;

	BRect knobRect(_KnobFrame(fontHeight));
	BRect rect(knobRect);
	be_control_look->DrawRadioButton(this, rect, updateRect, base, flags);

	BRect labelRect(Bounds());
	labelRect.left = knobRect.right + 1
		+ be_control_look->DefaultLabelSpacing();

	const BBitmap* icon = IconBitmap(
		B_INACTIVE_ICON_BITMAP | (IsEnabled() ? 0 : B_DISABLED_ICON_BITMAP));

	be_control_look->DrawLabel(this, Label(), icon, labelRect, updateRect,
		base, flags);
}

void
BIconButton::GetPreferredSize(float* width, float* height)
{
	float minWidth = 0.0f;
	float minHeight = 0.0f;
	if (IsValid()) {
		minWidth += fNormalBitmap->Bounds().IntegerWidth() + 1.0f;
		minHeight += fNormalBitmap->Bounds().IntegerHeight() + 1.0f;
	}

	const float kMinSpace = 15.0f;
	if (minWidth < kMinSpace)
		minWidth = kMinSpace;
	if (minHeight < kMinSpace)
		minHeight = kMinSpace;

	float hPadding = max_c(6.0f, ceilf(minHeight / 4.0f));
	float vPadding = max_c(6.0f, ceilf(minWidth / 4.0f));

	if (Label() != NULL && Label()[0] != '\0') {
		font_height fh;
		GetFontHeight(&fh);
		minHeight += ceilf(fh.ascent + fh.descent) + vPadding;
		minWidth += StringWidth(Label()) + vPadding;
	}

	if (width)
		*width = minWidth + hPadding;
	if (height)
		*height = minHeight + vPadding;
}

void
BStatusBar::_SetTextData(BString& text, const char* source,
                         const BString& combineWith, bool rightAligned)
{
    if (source == NULL)
        source = "";

    // If there were no changes, we don't have to do anything
    if (text == source)
        return;

    bool oldHasText = _HasText();
    text = source;

    BString newString;
    if (rightAligned)
        newString << text << combineWith;
    else
        newString << combineWith << text;

    if (oldHasText != _HasText())
        InvalidateLayout();

    font_height fontHeight;
    GetFontHeight(&fontHeight);

//	Invalidate(BRect(position, 0, position + invalidateWidth,
//		ceilf(fontHeight.ascent) + ceilf(fontHeight.descent)));
// TODO: redrawing the entire area takes care of the edge case
// where the left side string changes because of truncation and
// part of it needs to be redrawn as well.
    Invalidate(BRect(0, 0, Bounds().right,
                     ceilf(fontHeight.ascent) + ceilf(fontHeight.descent)));
}

void StaticString :: GetPreferredSize( float * w , float * h )
{
	font_height fh ;
	GetFontHeight( &fh ) ;
	*h = fh.ascent + fh.descent + fh.leading ;
	*w = StringWidth( Text() ) * 1.1 ;
}

//.........................................................
BOOL Cls_OnAdvInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam)
//WM_INITDIALOG handler
{
	TCHAR			fontName[80],
					charSet[64];
	LPPROPSHEETPAGE	psp = (LPPROPSHEETPAGE)lParam;

	LoadString(hInstance, IDS_TAB_FONT, fontName, SIZEOF_IN_CHAR(fontName));
	LoadString(hInstance, IDS_CHAR_SET, charSet, SIZEOF_IN_CHAR(charSet));

	hFont = CreateFont(GetFontHeight(hInstance, hwnd, IDS_FONT_HEIGHT), 0, 0, 0, FW_NORMAL, 
				FALSE, FALSE, 0,
			   CharSetFromString((LPTSTR)(const TCHAR *)charSet),
			   OUT_DEFAULT_PRECIS,
			   CLIP_DEFAULT_PRECIS,
			DEFAULT_QUALITY, TMPF_TRUETYPE | FF_DONTCARE,
			(const TCHAR *)fontName);


	hPeripheral = (HPERIPHERAL)psp->lParam;

	hAdvanced = hwnd;
	OnInitAdvancedDialog();

    return TRUE;
}

///////////////////////////////////////////////////////////////////////////////
// SetFont
void CXColorStatic::SetFont(LPCTSTR lpszFaceName, 
							int nPointSize, 
							BOOL bRedraw /*= TRUE*/)
{
	// null face name is ok - we will use current font

	LOGFONT lf;
	memset(&lf, 0, sizeof(lf));

	if (lpszFaceName == NULL)
	{
		CFont *pFont = GetFont();
		ASSERT(pFont);
		pFont->GetLogFont(&lf);
	}
	else
	{
		_tcsncpy(lf.lfFaceName, lpszFaceName, sizeof(lf.lfFaceName)/sizeof(TCHAR)-1);
	}

	m_nHeight = GetFontHeight(nPointSize);
	lf.lfHeight = m_nHeight;

	SetFont(&lf, bRedraw);
}

void ListedTextItems::Repaint( const WidgetPainter &painter )
{
    int entry_h = GetEntryHeight();
    int font_h = GetFontHeight();
    int shy = ( entry_h - font_h +1)/2;

    if (!_items.Empty())
    {
        int shsel = (_shift<0)? (-_shift) : 0;
        int shtxt = (_shift<0)? 0: _shift;
        int i,n,y;
        bool be_always_dirty = false;
        for( i=0, n=_items.Size(), y=0; i<n; ++i )
        {
            __Item k = _items[i];
 
            _skins.Select(k._state);
            _skins.Paint( painter, Pos( shsel,y ), Rect(0,0,GetWidth(),entry_h)+Pos( shsel,y ) );

            _fonts.Select(k._state);
            _fonts.Paint( painter, k._caption, Pos(shtxt, y+shy) );
            
            be_always_dirty |= IsAlwaysDirty();

            y += entry_h;
        }
        
        BeAlwaysDirty( be_always_dirty);
    }
}

void
BRadioButton::MouseDown(BPoint where)
{
	if (!IsEnabled() || !QueryCurrentMouse(true, B_PRIMARY_MOUSE_BUTTON)) return;

#if 0
	font_height fontHeight;
	GetFontHeight(&fontHeight);
	float sHeight = fontHeight.ascent + fontHeight.descent;

	BRect rect = Frame().OffsetToSelf(B_ORIGIN);
	rect.InsetBy(5, (rect.Height() - sHeight) / 2);
	if (rect.IsValid() == false) return;
	rect.right = rect.left + rect.Height();
	if (rect.Contains(where) == false) return;
#endif

	if ((Flags() &B_NAVIGABLE) && !IsFocus()) MakeFocus();

//	SetValue((Value() == B_CONTROL_ON) ?B_CONTROL_OFF :B_CONTROL_ON);

	if (Value() == B_CONTROL_ON) return;
	SetValue(B_CONTROL_ON);

	Invoke();
}

void
SButton::GetContentPreferredSize(float *width, float *height)
{
	if(!width && !height) return;

	float string_width = 0, string_height = 0;

	if(label)
	{
		string_width = StringWidth(label);

		font_height fheight;
		GetFontHeight(&fheight);
		string_height = fheight.ascent + fheight.descent + fheight.leading;
	}

	if(!bitmap)
	{
		if(width) *width = string_width;
		if(height) *height = string_height;
	}
	else
	{
		if(label) string_width += 3;
		if(width) *width = string_width + bitmap->Bounds().Width();
		if(height) *height = MAX(string_height, bitmap->Bounds().Height());
	}
}

void
DropDownBase::Init(UINT16 sX, UINT16 sY)
{
	mfMouseRegionsCreated = FALSE;

	musStartX = sX;
	musStartY = sY;
			
	mSelectedEntry			= min(mSelectedEntry, mEntryVector.size() - 1);
	mNumDisplayedEntries	= min(DROPDOWN_REGIONS, mEntryVector.size() );
	mFirstShownEntry		= max(0, min(mFirstShownEntry, mEntryVector.size() - 1 - mNumDisplayedEntries));

	musWidth = 0;
	UINT8 size = mEntryVector.size();
	for( UINT8 i = 0; i < size; ++i)
	{
		musWidth = max(musWidth, StringPixLength ( mEntryVector[i].second, DEF_DROPDOWN_FONT ));
	}

	// account for a bit of space let and right
	musWidth += 2 * CITY_NAME_OFFSET;

	musUpArrowX = musStartX + musWidth;
	musUpArrowY = musStartY + 2;
	
	musFontHeight = GetFontHeight( DEF_DROPDOWN_FONT );	// does not work on init of static objects, as the fonts do not yet exist!
}