return;
}
- // Get the previous logical index.
- const CharacterIndex previousLogical = isFirstPosition ? 0u : logical - 1u;
+ // 'logical' is the logical 'cursor' index.
+ // Get the next and current logical 'character' index.
+ const CharacterIndex nextCharacterIndex = logical;
+ const CharacterIndex characterIndex = isFirstPosition ? logical : logical - 1u;
- // Decrease the logical index if it's the last one.
- if( isLastPosition )
- {
- --logical;
- }
-
- // Get the direction of the character and the previous one.
+ // Get the direction of the character and the next one.
const CharacterDirection* const modelCharacterDirectionsBuffer = ( 0u != mLogicalModel->mCharacterDirections.Count() ) ? mLogicalModel->mCharacterDirections.Begin() : NULL;
CharacterDirection isCurrentRightToLeft = false;
- CharacterDirection isPreviousRightToLeft = false;
+ CharacterDirection isNextRightToLeft = false;
if( NULL != modelCharacterDirectionsBuffer ) // If modelCharacterDirectionsBuffer is NULL, it means the whole text is left to right.
{
- isCurrentRightToLeft = *( modelCharacterDirectionsBuffer + logical );
- isPreviousRightToLeft = *( modelCharacterDirectionsBuffer + previousLogical );
+ isCurrentRightToLeft = *( modelCharacterDirectionsBuffer + characterIndex );
+ isNextRightToLeft = *( modelCharacterDirectionsBuffer + nextCharacterIndex );
}
// Get the line where the character is laid-out.
const LineRun* modelLines = mVisualModel->mLines.Begin();
- const LineIndex lineIndex = mVisualModel->GetLineOfCharacter( logical );
+ const LineIndex lineIndex = mVisualModel->GetLineOfCharacter( characterIndex );
const LineRun& line = *( modelLines + lineIndex );
// Get the paragraph's direction.
// Check whether there is an alternative position:
- cursorInfo.isSecondaryCursor = ( isCurrentRightToLeft != isPreviousRightToLeft ) ||
- ( isLastPosition && ( isRightToLeftParagraph != isCurrentRightToLeft ) );
+ cursorInfo.isSecondaryCursor = ( !isLastPosition && ( isCurrentRightToLeft != isNextRightToLeft ) ) ||
+ ( isLastPosition && ( isRightToLeftParagraph != isCurrentRightToLeft ) );
// Set the line height.
cursorInfo.lineHeight = line.ascender + -line.descender;
- // Convert the cursor position into the glyph position.
- CharacterIndex characterIndex = logical;
- if( cursorInfo.isSecondaryCursor &&
- ( isRightToLeftParagraph != isCurrentRightToLeft ) )
+ // Calculate the primary cursor.
+
+ CharacterIndex index = characterIndex;
+ if( cursorInfo.isSecondaryCursor )
{
- characterIndex = previousLogical;
+ // If there is a secondary position, the primary cursor may be in a different place than the logical index.
+
+ if( isLastPosition )
+ {
+ // The position of the cursor after the last character needs special
+ // care depending on its direction and the direction of the paragraph.
+
+ // Need to find the first character after the last character with the paragraph's direction.
+ // i.e l0 l1 l2 r0 r1 should find r0.
+
+ // TODO: check for more than one line!
+ index = isRightToLeftParagraph ? line.characterRun.characterIndex : line.characterRun.characterIndex + line.characterRun.numberOfCharacters - 1u;
+ index = mLogicalModel->GetLogicalCharacterIndex( index );
+ }
+ else
+ {
+ index = ( isRightToLeftParagraph == isCurrentRightToLeft ) ? characterIndex : nextCharacterIndex;
+ }
}
- const GlyphIndex currentGlyphIndex = *( mVisualModel->mCharactersToGlyph.Begin() + characterIndex );
- const Length numberOfGlyphs = *( mVisualModel->mGlyphsPerCharacter.Begin() + characterIndex );
- const Length numberOfCharacters = *( mVisualModel->mCharactersPerGlyph.Begin() +currentGlyphIndex );
+ // Convert the cursor position into the glyph position.
+ const GlyphIndex primaryGlyphIndex = *( mVisualModel->mCharactersToGlyph.Begin() + index );
+ const Length primaryNumberOfGlyphs = *( mVisualModel->mGlyphsPerCharacter.Begin() + index );
+ const Length primaryNumberOfCharacters = *( mVisualModel->mCharactersPerGlyph.Begin() + primaryGlyphIndex );
// Get the metrics for the group of glyphs.
GlyphMetrics glyphMetrics;
- GetGlyphsMetrics( currentGlyphIndex,
- numberOfGlyphs,
+ GetGlyphsMetrics( primaryGlyphIndex,
+ primaryNumberOfGlyphs,
glyphMetrics,
mVisualModel,
mFontClient );
- float interGlyphAdvance = 0.f;
+ float glyphAdvance = 0.f;
if( !isLastPosition &&
- ( numberOfCharacters > 1u ) )
+ ( primaryNumberOfCharacters > 1u ) )
+ {
+ const CharacterIndex firstIndex = *( mVisualModel->mGlyphsToCharacters.Begin() + primaryGlyphIndex );
+ glyphAdvance = static_cast<float>( 1u + characterIndex - firstIndex ) * glyphMetrics.advance / static_cast<float>( primaryNumberOfCharacters );
+ }
+ else
{
- const CharacterIndex firstIndex = *( mVisualModel->mGlyphsToCharacters.Begin() + currentGlyphIndex );
- interGlyphAdvance = static_cast<float>( characterIndex - firstIndex ) * glyphMetrics.advance / static_cast<float>( numberOfCharacters );
+ glyphAdvance = glyphMetrics.advance;
}
// Get the glyph position and x bearing.
- const Vector2& currentPosition = *( mVisualModel->mGlyphPositions.Begin() + currentGlyphIndex );
+ const Vector2& primaryPosition = *( mVisualModel->mGlyphPositions.Begin() + primaryGlyphIndex );
- // Set the cursor's height.
- cursorInfo.primaryCursorHeight = glyphMetrics.fontHeight;
-
- // Set the position.
- cursorInfo.primaryPosition.x = -glyphMetrics.xBearing + currentPosition.x + ( isCurrentRightToLeft ? glyphMetrics.advance : interGlyphAdvance );
- cursorInfo.primaryPosition.y = line.ascender - glyphMetrics.ascender;
+ // Set the primary cursor's height.
+ cursorInfo.primaryCursorHeight = cursorInfo.isSecondaryCursor ? 0.5f * glyphMetrics.fontHeight : glyphMetrics.fontHeight;
+ // Set the primary cursor's position.
if( isLastPosition )
{
- // The position of the cursor after the last character needs special
- // care depending on its direction and the direction of the paragraph.
-
- if( cursorInfo.isSecondaryCursor )
- {
- // Need to find the first character after the last character with the paragraph's direction.
- // i.e l0 l1 l2 r0 r1 should find r0.
-
- // TODO: check for more than one line!
- characterIndex = isRightToLeftParagraph ? line.characterRun.characterIndex : line.characterRun.characterIndex + line.characterRun.numberOfCharacters - 1u;
- characterIndex = mLogicalModel->GetLogicalCharacterIndex( characterIndex );
-
- const GlyphIndex glyphIndex = *( mVisualModel->mCharactersToGlyph.Begin() + characterIndex );
- const Length numberOfGlyphs = *( mVisualModel->mGlyphsPerCharacter.Begin() + characterIndex );
-
- const Vector2& position = *( mVisualModel->mGlyphPositions.Begin() + glyphIndex );
+ cursorInfo.primaryPosition.x = -glyphMetrics.xBearing + primaryPosition.x + ( isRightToLeftParagraph ? 0.f : glyphMetrics.advance );
+ }
+ else
+ {
+ cursorInfo.primaryPosition.x = -glyphMetrics.xBearing + primaryPosition.x + ( ( ( isFirstPosition && !isCurrentRightToLeft ) || ( !isFirstPosition && isCurrentRightToLeft ) ) ? 0.f : glyphAdvance );
+ }
+ cursorInfo.primaryPosition.y = line.ascender - glyphMetrics.ascender;
- // Get the metrics for the group of glyphs.
- GlyphMetrics glyphMetrics;
- GetGlyphsMetrics( glyphIndex,
- numberOfGlyphs,
- glyphMetrics,
- mVisualModel,
- mFontClient );
+ // Calculate the secondary cursor.
- cursorInfo.primaryPosition.x = -glyphMetrics.xBearing + position.x + ( isRightToLeftParagraph ? 0.f : glyphMetrics.advance );
+ if( cursorInfo.isSecondaryCursor )
+ {
+ // Set the secondary cursor's height.
+ cursorInfo.secondaryCursorHeight = 0.5f * glyphMetrics.fontHeight;
- cursorInfo.primaryPosition.y = line.ascender - glyphMetrics.ascender;
- }
- else
+ CharacterIndex index = characterIndex;
+ if( !isLastPosition )
{
- if( !isCurrentRightToLeft )
- {
- cursorInfo.primaryPosition.x += glyphMetrics.advance;
- }
- else
- {
- cursorInfo.primaryPosition.x -= glyphMetrics.advance;
- }
+ index = ( isRightToLeftParagraph == isCurrentRightToLeft ) ? nextCharacterIndex : characterIndex;
}
- }
- // Set the alternative cursor position.
- if( cursorInfo.isSecondaryCursor )
- {
- // Convert the cursor position into the glyph position.
- const CharacterIndex previousCharacterIndex = ( ( isRightToLeftParagraph != isCurrentRightToLeft ) ? logical : previousLogical );
- const GlyphIndex previousGlyphIndex = *( mVisualModel->mCharactersToGlyph.Begin() + previousCharacterIndex );
- const Length numberOfGlyphs = *( mVisualModel->mGlyphsPerCharacter.Begin() + previousCharacterIndex );
+ const GlyphIndex secondaryGlyphIndex = *( mVisualModel->mCharactersToGlyph.Begin() + index );
+ const Length secondaryNumberOfGlyphs = *( mVisualModel->mGlyphsPerCharacter.Begin() + index );
- // Get the glyph position.
- const Vector2& previousPosition = *( mVisualModel->mGlyphPositions.Begin() + previousGlyphIndex );
+ const Vector2& secondaryPosition = *( mVisualModel->mGlyphPositions.Begin() + index );
- // Get the metrics for the group of glyphs.
- GlyphMetrics glyphMetrics;
- GetGlyphsMetrics( previousGlyphIndex,
- numberOfGlyphs,
+ GetGlyphsMetrics( secondaryGlyphIndex,
+ secondaryNumberOfGlyphs,
glyphMetrics,
mVisualModel,
mFontClient );
- // Set the cursor position and height.
- cursorInfo.secondaryPosition.x = -glyphMetrics.xBearing + previousPosition.x + ( ( ( isLastPosition && !isCurrentRightToLeft ) ||
- ( !isLastPosition && isCurrentRightToLeft ) ) ? glyphMetrics.advance : 0.f );
-
- cursorInfo.secondaryCursorHeight = 0.5f * glyphMetrics.fontHeight;
-
+ // Set the secondary cursor's position.
+ cursorInfo.secondaryPosition.x = -glyphMetrics.xBearing + secondaryPosition.x + ( isCurrentRightToLeft ? 0.f : glyphMetrics.advance );
cursorInfo.secondaryPosition.y = cursorInfo.lineHeight - cursorInfo.secondaryCursorHeight - line.descender - ( glyphMetrics.fontHeight - glyphMetrics.ascender );
-
- // Update the primary cursor height as well.
- cursorInfo.primaryCursorHeight *= 0.5f;
}
}