struct LayoutEngine::Impl
{
Impl()
- : mLayout( LayoutEngine::SINGLE_LINE_BOX )
+ : mLayout( LayoutEngine::SINGLE_LINE_BOX ),
+ mAlignment( LayoutEngine::ALIGN_BEGIN )
{
mFontClient = TextAbstraction::FontClient::Get();
}
// Get the glyph info.
const GlyphInfo& glyphInfo = *( parameters.glyphsBuffer + glyphIndex );
+ // Check whether is a white space.
+ const Character character = *( parameters.textBuffer + lineLayout.numberOfCharacters );
+ const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( character );
+
// Get the character indices for the current glyph. The last character index is needed
// because there are glyphs formed by more than one character but their break info is
// given only for the last character.
lineLayout.numberOfGlyphs++;
// Increase the accumulated length.
- lineLayout.length += ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+ const float glyphLength = ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+
+ if( isWhiteSpace )
+ {
+ // Add the length to the length of white spaces at the end of the line.
+ lineLayout.wsLengthEndOfLine += glyphLength;
+ }
+ else
+ {
+ // Add as well any previous white space length.
+ lineLayout.length += lineLayout.wsLengthEndOfLine + glyphLength;
+
+ // Clear the white space length at the end of the line.
+ lineLayout.wsLengthEndOfLine = 0.f;
+ }
if( lastFontId != glyphInfo.fontId )
{
// Increase the number of glyphs.
tmpLineLayout.numberOfGlyphs++;
+ // Check whether is a white space.
+ const Character character = *( parameters.textBuffer + characterFirstIndex );
+ const bool isWhiteSpace = TextAbstraction::IsWhiteSpace( character );
+
// Increase the accumulated length.
- tmpLineLayout.length += ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+ if( isWhiteSpace )
+ {
+ // Add the length to the length of white spaces at the end of the line.
+ tmpLineLayout.wsLengthEndOfLine += glyphInfo.advance; // I use the advance as the width is always zero for the white spaces.
+ }
+ else
+ {
+ // Add as well any previous white space length.
+ tmpLineLayout.length += tmpLineLayout.wsLengthEndOfLine + ( glyphIndex == lastGlyphIndex ) ? glyphInfo.width : glyphInfo.advance;
+
+ // Clear the white space length at the end of the line.
+ tmpLineLayout.wsLengthEndOfLine = 0.f;
+ }
// Check if the accumulated length fits in the width of the box.
- if( lineLayout.length + tmpLineLayout.length > parameters.boundingBox.width )
+ if( lineLayout.length + tmpLineLayout.length + ( ( 0.f < tmpLineLayout.length ) ? lineLayout.wsLengthEndOfLine : 0.f ) > parameters.boundingBox.width )
{
// Current word does not fit in the box's width.
return;
lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
lineLayout.length += tmpLineLayout.length;
- lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+
+ if( 0.f < tmpLineLayout.length )
+ {
+ lineLayout.length += lineLayout.wsLengthEndOfLine;
+
+ lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ }
+ else
+ {
+ lineLayout.wsLengthEndOfLine += tmpLineLayout.wsLengthEndOfLine;
+ }
if( tmpLineLayout.height > lineLayout.height )
{
lineLayout.numberOfCharacters += tmpLineLayout.numberOfCharacters;
lineLayout.numberOfGlyphs += tmpLineLayout.numberOfGlyphs;
lineLayout.length += tmpLineLayout.length;
- lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ if( 0.f < tmpLineLayout.length )
+ {
+ lineLayout.length += lineLayout.wsLengthEndOfLine;
+
+ lineLayout.wsLengthEndOfLine = tmpLineLayout.wsLengthEndOfLine;
+ }
+ else
+ {
+ lineLayout.wsLengthEndOfLine += tmpLineLayout.wsLengthEndOfLine;
+ }
if( tmpLineLayout.height > lineLayout.height )
{
void ReLayoutRightToLeftLines( const LayoutParameters& layoutParameters,
Vector<Vector2>& glyphPositions )
{
- for( Length lineIndex = 0u; lineIndex < layoutParameters.numberOfBidirectionalInfoRuns; ++lineIndex )
+ for( LineIndex lineIndex = 0u; lineIndex < layoutParameters.numberOfBidirectionalInfoRuns; ++lineIndex )
{
const BidirectionalLineInfoRun& bidiLine = *( layoutParameters.lineBidirectionalInfoRunsBuffer +lineIndex );
Vector2& position = *( glyphPositionsBuffer + glyphIndex );
position.x = penX + glyph.xBearing;
-
penX += glyph.advance;
}
}
}
}
+ void Align( const LayoutParameters& layoutParameters,
+ const Vector<LineRun>& lines,
+ Vector<Vector2>& glyphPositions )
+ {
+ Vector2* glyphPositionsBuffer = glyphPositions.Begin();
+
+ // Traverse all lines and align the glyphs.
+ // LayoutParameters contains bidirectional info for those lines with
+ // right to left text, this info includes the paragraph's direction.
+
+ LineIndex bidiLineIndex = 0u;
+ for( Vector<LineRun>::ConstIterator it = lines.Begin(), endIt = lines.End();
+ it != endIt;
+ ++it )
+ {
+ const LineRun& line = *it;
+
+ // 1) Get the paragrap's direction.
+ bool paragraphDirection = false;
+
+ // Check if there is any right to left line.
+ if( ( NULL != layoutParameters.lineBidirectionalInfoRunsBuffer ) &&
+ ( bidiLineIndex < layoutParameters.numberOfBidirectionalInfoRuns ) )
+ {
+ const BidirectionalLineInfoRun* bidiLine = layoutParameters.lineBidirectionalInfoRunsBuffer + bidiLineIndex;
+
+ // Get the right to left line that match with current line.
+ while( ( line.characterRun.characterIndex > bidiLine->characterRun.characterIndex ) &&
+ ( bidiLineIndex < layoutParameters.numberOfBidirectionalInfoRuns ) )
+ {
+ ++bidiLineIndex;
+ bidiLine = layoutParameters.lineBidirectionalInfoRunsBuffer + bidiLineIndex;
+ }
+
+ if( line.characterRun.characterIndex == bidiLine->characterRun.characterIndex )
+ {
+ paragraphDirection = bidiLine->direction;
+ }
+ }
+
+ // 2) Calculate the alignment offset accordingly with the align option,
+ // the box width, line length, and the paragraphs direction.
+ float alignOffset = CalculateAlignment( layoutParameters.boundingBox.width,
+ line.lineSize.width,
+ line.extraLength,
+ paragraphDirection );
+
+ // 3) Traverse all glyphs and update the 'x' position.
+ for( GlyphIndex index = line.glyphIndex,
+ endIndex = line.glyphIndex + line.numberOfGlyphs;
+ index < endIndex;
+ ++index )
+ {
+ Vector2& position = *( glyphPositionsBuffer + index );
+
+ position.x += alignOffset;
+ }
+ }
+ }
+
bool SingleLineLayout( const LayoutParameters& layoutParameters,
Vector<Vector2>& glyphPositions,
Vector<LineRun>& lines,
lineRun.characterRun.numberOfCharacters = *( layoutParameters.glyphsToCharactersBuffer + lastGlyphIndex ) + *( layoutParameters.charactersPerGlyphBuffer + lastGlyphIndex );
lineRun.lineSize.width = layout.length;
lineRun.lineSize.height = layout.height;
+ lineRun.extraLength = layout.wsLengthEndOfLine;
lines.PushBack( lineRun );
lineRun.characterRun.numberOfCharacters = ( *( layoutParameters.glyphsToCharactersBuffer + lastGlyphIndex ) + *( layoutParameters.charactersPerGlyphBuffer + lastGlyphIndex ) ) - lineRun.characterRun.characterIndex;
lineRun.lineSize.width = layout.length;
lineRun.lineSize.height = layout.height;
+ lineRun.extraLength = layout.wsLengthEndOfLine;
lines.PushBack( lineRun );
return true;
}
+ float CalculateAlignment( float boxWidth,
+ float lineLength,
+ float extraLength,
+ bool paragraphDirection )
+ {
+ float offset = 0.f;
+
+ Alignment alignment = mAlignment;
+ if( paragraphDirection &&
+ ( ALIGN_CENTER != alignment ) )
+ {
+ if( ALIGN_BEGIN == alignment )
+ {
+ alignment = ALIGN_END;
+ }
+ else
+ {
+ alignment = ALIGN_BEGIN;
+ }
+ }
+
+ switch( alignment )
+ {
+ case ALIGN_BEGIN:
+ {
+ offset = 0.f;
+ break;
+ }
+ case ALIGN_CENTER:
+ {
+ offset = 0.5f * ( boxWidth - lineLength );
+ break;
+ }
+ case ALIGN_END:
+ {
+ offset = boxWidth - lineLength;
+ break;
+ }
+ }
+
+ if( paragraphDirection )
+ {
+ offset -= extraLength;
+ }
+
+ return offset;
+ }
+
LayoutEngine::Layout mLayout;
+ LayoutEngine::Alignment mAlignment;
TextAbstraction::FontClient mFontClient;
};
return mImpl->mLayout;
}
+void LayoutEngine::SetAlignment( Alignment alignment )
+{
+ mImpl->mAlignment = alignment;
+}
+
+LayoutEngine::Alignment LayoutEngine::GetAlignment() const
+{
+ return mImpl->mAlignment;
+}
+
bool LayoutEngine::LayoutText( const LayoutParameters& layoutParameters,
Vector<Vector2>& glyphPositions,
Vector<LineRun>& lines,
glyphPositions );
}
+void LayoutEngine::Align( const LayoutParameters& layoutParameters,
+ const Vector<LineRun>& lines,
+ Vector<Vector2>& glyphPositions )
+{
+ mImpl->Align( layoutParameters,
+ lines,
+ glyphPositions );
+}
+
} // namespace Text
} // namespace Toolkit
projects / platform / core / uifw / dali-toolkit.git / blobdiff