C++ AttributedString::getText方法代码示例

    bool setupLayout (const AttributedString& text, const float maxWidth, const float maxHeight,
                      ID2D1RenderTarget& renderTarget, IDWriteFactory& directWriteFactory,
                      IDWriteFontCollection& fontCollection, ComSmartPtr<IDWriteTextLayout>& textLayout)
    {
        // To add color to text, we need to create a D2D render target
        // Since we are not actually rendering to a D2D context we create a temporary GDI render target

        Font defaultFont;
        BOOL fontFound = false;
        uint32 fontIndex;
        fontCollection.FindFamilyName (defaultFont.getTypeface()->getName().toWideCharPointer(), &fontIndex, &fontFound);

        if (! fontFound)
            fontIndex = 0;

        ComSmartPtr<IDWriteFontFamily> dwFontFamily;
        HRESULT hr = fontCollection.GetFontFamily (fontIndex, dwFontFamily.resetAndGetPointerAddress());

        ComSmartPtr<IDWriteFont> dwFont;
        hr = dwFontFamily->GetFirstMatchingFont (DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STRETCH_NORMAL, DWRITE_FONT_STYLE_NORMAL,
                                                 dwFont.resetAndGetPointerAddress());
        jassert (dwFont != nullptr);

        const float defaultFontHeightToEmSizeFactor = getFontHeightToEmSizeFactor (*dwFont);

        ComSmartPtr<IDWriteTextFormat> dwTextFormat;
        hr = directWriteFactory.CreateTextFormat (defaultFont.getTypefaceName().toWideCharPointer(), &fontCollection,
                                                  DWRITE_FONT_WEIGHT_REGULAR, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_NORMAL,
                                                  defaultFont.getHeight() * defaultFontHeightToEmSizeFactor,
                                                  L"en-us", dwTextFormat.resetAndGetPointerAddress());

        setTextFormatProperties (text, *dwTextFormat);

        {
            DWRITE_TRIMMING trimming = { DWRITE_TRIMMING_GRANULARITY_CHARACTER, 0, 0 };
            ComSmartPtr<IDWriteInlineObject> trimmingSign;
            hr = directWriteFactory.CreateEllipsisTrimmingSign (dwTextFormat, trimmingSign.resetAndGetPointerAddress());
            hr = dwTextFormat->SetTrimming (&trimming, trimmingSign);
        }

        const int textLen = text.getText().length();

        hr = directWriteFactory.CreateTextLayout (text.getText().toWideCharPointer(), textLen, dwTextFormat,
                                                  maxWidth, maxHeight, textLayout.resetAndGetPointerAddress());

        if (FAILED (hr) || textLayout == nullptr)
            return false;

        const int numAttributes = text.getNumAttributes();

        for (int i = 0; i < numAttributes; ++i)
            addAttributedRange (*text.getAttribute (i), *textLayout, textLen, renderTarget, fontCollection);

        return true;
    }

    void setupLayout (const AttributedString& text, const float& maxWidth, const float& maxHeight,
                      ID2D1RenderTarget* const renderTarget, IDWriteFactory* const directWriteFactory,
                      IDWriteFontCollection* const fontCollection, IDWriteTextLayout** dwTextLayout)
    {
        // To add color to text, we need to create a D2D render target
        // Since we are not actually rendering to a D2D context we create a temporary GDI render target

        Font defaultFont;
        BOOL fontFound = false;
        uint32 fontIndex;
        fontCollection->FindFamilyName (defaultFont.getTypeface()->getName().toWideCharPointer(), &fontIndex, &fontFound);

        if (! fontFound)
            fontIndex = 0;

        ComSmartPtr<IDWriteFontFamily> dwFontFamily;
        HRESULT hr = fontCollection->GetFontFamily (fontIndex, dwFontFamily.resetAndGetPointerAddress());

        ComSmartPtr<IDWriteFont> dwFont;
        hr = dwFontFamily->GetFirstMatchingFont (DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STRETCH_NORMAL, DWRITE_FONT_STYLE_NORMAL,
                                                 dwFont.resetAndGetPointerAddress());

        const float defaultFontHeightToEmSizeFactor = getFontHeightToEmSizeFactor (dwFont);

        jassert (directWriteFactory != nullptr);

        ComSmartPtr<IDWriteTextFormat> dwTextFormat;
        hr = directWriteFactory->CreateTextFormat (defaultFont.getTypefaceName().toWideCharPointer(), fontCollection,
                                                   DWRITE_FONT_WEIGHT_REGULAR, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_NORMAL,
                                                   defaultFont.getHeight() * defaultFontHeightToEmSizeFactor,
                                                   L"en-us", dwTextFormat.resetAndGetPointerAddress());

        setTextFormatProperties (text, dwTextFormat);

        const int textLen = text.getText().length();

        hr = directWriteFactory->CreateTextLayout (text.getText().toWideCharPointer(), textLen,
                                                   dwTextFormat, maxWidth, maxHeight, dwTextLayout);

        const int numAttributes = text.getNumAttributes();

        for (int i = 0; i < numAttributes; ++i)
            addAttributedRange (*text.getAttribute (i), *dwTextLayout, textLen, renderTarget, fontCollection);
    }

void SimpleTypeLayout::appendText (const AttributedString& text,
                                   const Range<int>& stringRange, const Font& font,
                                   const Colour& colour)
{
    String stringText = text.getText().substring(stringRange.getStart(), stringRange.getEnd());
    String::CharPointerType t (stringText.getCharPointer());
    String currentString;
    int lastCharType = 0;

    for (;;)
    {
        const juce_wchar c = t.getAndAdvance();
        if (c == 0)
            break;

        int charType;
        if (c == '\r' || c == '\n')
        {
            charType = 0;
        }
        else if (CharacterFunctions::isWhitespace (c))
        {
            charType = 2;
        }
        else
        {
            charType = 1;
        }

        if (charType == 0 || charType != lastCharType)
        {
            if (currentString.isNotEmpty())
            {
                tokens.add (new Token (currentString, font, colour,
                                       lastCharType == 2 || lastCharType == 0));
            }

            currentString = String::charToString (c);

            if (c == '\r' && *t == '\n')
                currentString += t.getAndAdvance();
        }
        else
        {
            currentString += c;
        }

        lastCharType = charType;
    }

    if (currentString.isNotEmpty())
        tokens.add (new Token (currentString, font, colour, lastCharType == 2));
}

        void addTextRuns (const AttributedString& text)
        {
            Font defaultFont;
            Array<RunAttribute> runAttributes;

            {
                const int stringLength = text.getText().length();
                int rangeStart = 0;
                FontAndColour lastFontAndColour;

                // Iterate through every character in the string
                for (int i = 0; i < stringLength; ++i)
                {
                    FontAndColour newFontAndColour;
                    newFontAndColour.font = &defaultFont;

                    const int numCharacterAttributes = text.getNumAttributes();

                    for (int j = 0; j < numCharacterAttributes; ++j)
                    {
                        const AttributedString::Attribute* const attr = text.getAttribute (j);

                        // Check if the current character falls within the range of a font attribute
                        if (attr->getFont() != nullptr && (i >= attr->range.getStart()) && (i < attr->range.getEnd()))
                            newFontAndColour.font = attr->getFont();

                        // Check if the current character falls within the range of a foreground colour attribute
                        if (attr->getColour() != nullptr && (i >= attr->range.getStart()) && (i < attr->range.getEnd()))
                            newFontAndColour.colour = *attr->getColour();
                    }

                    if (i > 0 && (newFontAndColour != lastFontAndColour || i == stringLength - 1))
                    {
                        runAttributes.add (RunAttribute (lastFontAndColour,
                                                         Range<int> (rangeStart, (i < stringLength - 1) ? i : (i + 1))));
                        rangeStart = i;
                    }

                    lastFontAndColour = newFontAndColour;
                }
            }

            for (int i = 0; i < runAttributes.size(); ++i)
            {
                const RunAttribute& r = runAttributes.getReference(i);
                appendText (text, r.range, *(r.fontAndColour.font), r.fontAndColour.colour);
            }
        }

void SimpleTypeLayout::getGlyphLayout (const AttributedString& text, GlyphLayout& glyphLayout)
{
    clear();
    int stringLength = text.getText().length();
    int numCharacterAttributes = text.getCharAttributesSize();
    int rangeStart = 0;
    // Character attributes are applied as a series of ranges. These ranges may overlap or there may
    // be multiple attributes for the same range. We need to come up with a single set of unique and
    // non overlapping ranges.
    // The approach below iterates through every character, looks through all the attributes and their
    // ranges and stores the last font or color that was applied. It think constructs a set of unique
    // and non overlapping ranges by comparing each character's attributes to the previous characters
    // attributes.
    // A more efficient approach may be to split and combine the individual ranges to construct the
    // set of unique and non overlapping ranges. This more efficient approach, if possible, would only
    // need to iterate through all the attributes once. This would be much faster than the current
    // approach which loops through all the attributes for every character.
    Font defaultFont;
    Colour defaultColour (Colours::black);
    Array<RunAttribute> runAttributes;
    Array<CharAttribute> charAttributes;
    charAttributes.ensureStorageAllocated (stringLength);
    // Iterate through every character in the string
    for (int i = 0; i < stringLength; ++i)
    {
        CharAttribute attribute;
        attribute.font = &defaultFont;
        attribute.colour = &defaultColour;
        // Iterate through every character attribute
        for (int j = 0; j < numCharacterAttributes; ++j)
        {
            Attr* attr = text.getCharAttribute (j);
            // Check if the current character falls within the range of a font attribute
            if (attr->attribute == Attr::font && (i >= attr->range.getStart()) && (i < attr->range.getEnd()))
            {
                AttrFont* attrFont = static_cast<AttrFont*>(attr);
                attribute.font = &(attrFont->font);
            }
            // Check if the current character falls within the range of a foreground colour attribute
            if (attr->attribute == Attr::foregroundColour && (i >= attr->range.getStart()) && (i < attr->range.getEnd()))
            {
                AttrColour* attrColour = static_cast<AttrColour*>(attr);
                attribute.colour = &(attrColour->colour);
            }
        }
        charAttributes.add(attribute);
        // Skip the first character since we are comparing to previous characters
        if (i == 0)
            continue;
        if ((charAttributes[i-1].font != charAttributes[i].font) ||
            (charAttributes[i-1].colour != charAttributes[i].colour) ||
            (*(charAttributes[i-1].font) != *(charAttributes[i].font)) ||
            (*(charAttributes[i-1].colour) != *(charAttributes[i].colour)) ||
            (i + 1 == stringLength))
        {
            // The current character has a new font or new color or there is no next character
            RunAttribute attribute;
            attribute.range.setStart (rangeStart);
            attribute.range.setEnd (i);
            if (i + 1 == stringLength)
                attribute.range.setEnd (i+1);
            attribute.font = charAttributes[i-1].font;
            attribute.colour = charAttributes[i-1].colour;
            runAttributes.add (attribute);
            rangeStart = i;
        }

    }
    charAttributes.clear();
    for (int i = 0; i < runAttributes.size(); ++i)
    {
        appendText (text, runAttributes[i].range, *(runAttributes[i].font), *(runAttributes[i].colour));
    }
    runAttributes.clear();
    // Run layout to break strings into words and create lines from words
    layout ((int) glyphLayout.getWidth());
    // Use tokens to create Glyph Structures
    glyphLayout.setNumLines (getNumLines());
    // Set Starting Positions to 0
    int charPosition = 0;
    int lineStartPosition = 0;
    int runStartPosition = 0;
    // Create first GlyphLine and GlyphRun
    GlyphLine* glyphLine = new GlyphLine();
    GlyphRun* glyphRun = new GlyphRun();
    for (int i = 0; i < tokens.size(); ++i)
    {
        const Token* const t = tokens.getUnchecked (i);
        // See TextLayout::draw
        const float xOffset = (float) t->x;
        const float yOffset = (float) t->y;
        // See GlyphArrangement::addCurtailedLineOfText
        Array <int> newGlyphs;
        Array <float> xOffsets;
        t->font.getGlyphPositions (t->text.trimEnd(), newGlyphs, xOffsets);
        // Resize glyph run array
        glyphRun->setNumGlyphs (glyphRun->getNumGlyphs() + newGlyphs.size());
        // Add each glyph in the token to the current GlyphRun
        for (int j = 0; j < newGlyphs.size(); ++j)
        {
//.........这里部分代码省略.........

    void createLayout (TextLayout& layout, const AttributedString& text, IDWriteFactory* const directWriteFactory,
                       ID2D1Factory* const direct2dFactory, IDWriteFontCollection* const fontCollection)
    {
        // To add color to text, we need to create a D2D render target
        // Since we are not actually rendering to a D2D context we create a temporary GDI render target

        D2D1_RENDER_TARGET_PROPERTIES d2dRTProp = D2D1::RenderTargetProperties (D2D1_RENDER_TARGET_TYPE_SOFTWARE,
                                                                                D2D1::PixelFormat (DXGI_FORMAT_B8G8R8A8_UNORM,
                                                                                                   D2D1_ALPHA_MODE_IGNORE),
                                                                                0, 0,
                                                                                D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE,
                                                                                D2D1_FEATURE_LEVEL_DEFAULT);
        ComSmartPtr<ID2D1DCRenderTarget> renderTarget;
        HRESULT hr = direct2dFactory->CreateDCRenderTarget (&d2dRTProp, renderTarget.resetAndGetPointerAddress());

        Font defaultFont;
        BOOL fontFound = false;
        uint32 fontIndex;
        fontCollection->FindFamilyName (defaultFont.getTypefaceName().toWideCharPointer(), &fontIndex, &fontFound);

        if (! fontFound)
            fontIndex = 0;

        ComSmartPtr<IDWriteFontFamily> dwFontFamily;
        hr = fontCollection->GetFontFamily (fontIndex, dwFontFamily.resetAndGetPointerAddress());

        ComSmartPtr<IDWriteFont> dwFont;
        hr = dwFontFamily->GetFirstMatchingFont (DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STRETCH_NORMAL, DWRITE_FONT_STYLE_NORMAL,
                                                 dwFont.resetAndGetPointerAddress());

        const float defaultFontHeightToEmSizeFactor = getFontHeightToEmSizeFactor (dwFont);

        jassert (directWriteFactory != nullptr);

        ComSmartPtr<IDWriteTextFormat> dwTextFormat;
        hr = directWriteFactory->CreateTextFormat (defaultFont.getTypefaceName().toWideCharPointer(), fontCollection,
                                                   DWRITE_FONT_WEIGHT_REGULAR, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_NORMAL,
                                                   defaultFont.getHeight() * defaultFontHeightToEmSizeFactor,
                                                   L"en-us", dwTextFormat.resetAndGetPointerAddress());

        setTextFormatProperties (text, dwTextFormat);

        const int textLen = text.getText().length();

        ComSmartPtr<IDWriteTextLayout> dwTextLayout;
        hr = directWriteFactory->CreateTextLayout (text.getText().toWideCharPointer(), textLen,
                                                   dwTextFormat, layout.getWidth(),
                                                   1.0e7f, dwTextLayout.resetAndGetPointerAddress());

        const int numAttributes = text.getNumAttributes();

        for (int i = 0; i < numAttributes; ++i)
            addAttributedRange (*text.getAttribute (i), dwTextLayout, textLen, renderTarget, fontCollection);

        UINT32 actualLineCount = 0;
        hr = dwTextLayout->GetLineMetrics (nullptr, 0, &actualLineCount);

        layout.ensureStorageAllocated (actualLineCount);

        {
            ComSmartPtr<CustomDirectWriteTextRenderer> textRenderer (new CustomDirectWriteTextRenderer (fontCollection));
            hr = dwTextLayout->Draw (&layout, textRenderer, 0, 0);
        }

        HeapBlock <DWRITE_LINE_METRICS> dwLineMetrics (actualLineCount);
        hr = dwTextLayout->GetLineMetrics (dwLineMetrics, actualLineCount, &actualLineCount);
        int lastLocation = 0;
        const int numLines = jmin ((int) actualLineCount, layout.getNumLines());

        for (int i = 0; i < numLines; ++i)
        {
            lastLocation = dwLineMetrics[i].length;
            layout.getLine(i).stringRange = Range<int> (lastLocation, (int) lastLocation + dwLineMetrics[i].length);
        }
    }

    // This method takes an attributed string and outputs a GlyphLayout data
    // structure that contains the glyph number and location of each inidividual glyph
    void getGlyphLayout (const AttributedString& text, GlyphLayout& glyphLayout)
    {
        // For now we are creating the DirectWrite Factory, System Font Collection,
        // D2D Factory and GDI Render target every time we layout text.
        // This is inefficient and we may be loading and unloading libraries each layout.
        // These four things should be created once at application startup and be destroyed
        // when the application exits. I'm not sure where the best place to do this so
        // for now I will just use the inefficient method.

        IDWriteFactory* dwFactory = nullptr;
        HRESULT hr = DWriteCreateFactory (DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory),
            reinterpret_cast<IUnknown**>(&dwFactory));

        IDWriteFontCollection* dwFontCollection = nullptr;
        hr = dwFactory->GetSystemFontCollection (&dwFontCollection);

        // To add color to text, we need to create a D2D render target
        // Since we are not actually rendering to a D2D context we create a temporary GDI render target
        ID2D1Factory *d2dFactory = nullptr;
        hr = D2D1CreateFactory (D2D1_FACTORY_TYPE_SINGLE_THREADED, &d2dFactory);
        D2D1_RENDER_TARGET_PROPERTIES d2dRTProp = D2D1::RenderTargetProperties(
            D2D1_RENDER_TARGET_TYPE_SOFTWARE,
            D2D1::PixelFormat(
            DXGI_FORMAT_B8G8R8A8_UNORM,
            D2D1_ALPHA_MODE_IGNORE),
            0,
            0,
            D2D1_RENDER_TARGET_USAGE_GDI_COMPATIBLE,
            D2D1_FEATURE_LEVEL_DEFAULT
            );
        ID2D1DCRenderTarget* d2dDCRT = nullptr;
        hr = d2dFactory->CreateDCRenderTarget (&d2dRTProp, &d2dDCRT);

        // Initially we set the paragraph up with a default font and then apply the attributed string ranges later
        Font defaultFont;
        const float defaultFontHeightToEmSizeFactor = getFontHeightToEmSizeFactor (defaultFont, *dwFontCollection);
        // We should probably be detecting the locale instead of hard coding it to en-us
        String localeName("en-us");

        // We multiply the font height by the size factor so we layout text at the correct size
        IDWriteTextFormat* dwTextFormat = nullptr;
        hr = dwFactory->CreateTextFormat (
            defaultFont.getTypefaceName().toWideCharPointer(),
            dwFontCollection,
            DWRITE_FONT_WEIGHT_REGULAR,
            DWRITE_FONT_STYLE_NORMAL,
            DWRITE_FONT_STRETCH_NORMAL,
            defaultFont.getHeight() * defaultFontHeightToEmSizeFactor,
            localeName.toWideCharPointer(),
            &dwTextFormat
            );

        // Paragraph Attributes
        // Set Paragraph Alignment
        if (text.getTextAlignment() == AttributedString::left)
            dwTextFormat->SetTextAlignment (DWRITE_TEXT_ALIGNMENT_LEADING);
        if (text.getTextAlignment() == AttributedString::right)
            dwTextFormat->SetTextAlignment (DWRITE_TEXT_ALIGNMENT_TRAILING);
        if (text.getTextAlignment() == AttributedString::center)
            dwTextFormat->SetTextAlignment (DWRITE_TEXT_ALIGNMENT_CENTER);
        // DirectWrite cannot justify text, default to left alignment
        if (text.getTextAlignment() == AttributedString::justified)
            dwTextFormat->SetTextAlignment (DWRITE_TEXT_ALIGNMENT_LEADING);
        // Set Word Wrap
        if (text.getWordWrap() == AttributedString::none)
            dwTextFormat->SetWordWrapping (DWRITE_WORD_WRAPPING_NO_WRAP);
        if (text.getWordWrap() == AttributedString::byWord)
            dwTextFormat->SetWordWrapping (DWRITE_WORD_WRAPPING_WRAP);
        // DirectWrite does not support wrapping by character, default to wrapping by word
        if (text.getWordWrap() == AttributedString::byChar)
            dwTextFormat->SetWordWrapping (DWRITE_WORD_WRAPPING_WRAP);
        // DirectWrite does not automatically set reading direction
        // This must be set correctly and manually when using RTL Scripts (Hebrew, Arabic)
        if (text.getReadingDirection() == AttributedString::rightToLeft)
            dwTextFormat->SetReadingDirection (DWRITE_READING_DIRECTION_RIGHT_TO_LEFT);

        IDWriteTextLayout* dwTextLayout = nullptr;
        hr = dwFactory->CreateTextLayout (
            text.getText().toWideCharPointer(),
            text.getText().length(),
            dwTextFormat,
            glyphLayout.getWidth(),
            glyphLayout.getHeight(),
            &dwTextLayout
            );

        // Character Attributes
        int numCharacterAttributes = text.getCharAttributesSize();
        for (int i = 0; i < numCharacterAttributes; ++i)
        {
            Attr* attr = text.getCharAttribute (i);
            // Character Range Error Checking
            if (attr->range.getStart() > text.getText().length()) continue;
            if (attr->range.getEnd() > text.getText().length()) attr->range.setEnd (text.getText().length());
            if (attr->attribute == Attr::font)
            {
                AttrFont* attrFont = static_cast<AttrFont*>(attr);
                DWRITE_TEXT_RANGE dwRange;
//.........这里部分代码省略.........