/// <summary>
/// Creating a simple text run
/// </summary>
/// <param name="settings">text formatting settings</param>
/// <param name="charString">character string associated to textrun</param>
/// <param name="textRun">text run</param>
/// <param name="cp">first cp of the run</param>
/// <param name="cpFirst">first cp of the line</param>
/// <param name="runLength">run length</param>
/// <param name="widthLeft">maximum run width</param>
/// <param name="idealRunOffsetUnRounded">run's offset from the beginning of the line</param>
/// <returns>a SimpleRun object</returns>
static public SimpleRun Create(
FormatSettings settings,
CharacterBufferRange charString,
TextRun textRun,
int cp,
int cpFirst,
int runLength,
int widthLeft,
int idealRunOffsetUnRounded
)
{
SimpleRun run = null;
if (textRun is TextCharacters)
{
if ( textRun.Properties.BaselineAlignment != BaselineAlignment.Baseline
|| (textRun.Properties.TextEffects != null && textRun.Properties.TextEffects.Count != 0)
)
{
// fast path does not handle the following conditions
// o non-default baseline alignment
// o text drawing effect (
return null;
}
TextDecorationCollection textDecorations = textRun.Properties.TextDecorations;
if ( textDecorations != null
&& textDecorations.Count != 0
&& !textDecorations.ValueEquals(TextDecorations.Underline))
{
// we only support a single underline
return null;
}
settings.DigitState.SetTextRunProperties(textRun.Properties);
if (settings.DigitState.RequiresNumberSubstitution)
{
// don't support number substitution in fast path
return null;
}
bool canProcessTabsInSimpleShapingPath = CanProcessTabsInSimpleShapingPath(
settings.Pap,
settings.Formatter.TextFormattingMode
);
if (charString[0] == TextStore.CharCarriageReturn)
{
// CR in the middle of text stream treated as explicit paragraph break
// simple hard line break
runLength = 1;
if (charString.Length > 1 && charString[1] == TextStore.CharLineFeed)
{
runLength = 2;
}
// This path handles the case where the backing store breaks the text run in between
// a Carriage Return and a Line Feed. So we fetch the next run to check whether the next
// character is a line feed.
else if (charString.Length == 1)
{
// Prefetch to check for line feed.
TextRun newRun;
int newRunLength;
CharacterBufferRange newBufferRange = settings.FetchTextRun(
cp + 1,
cpFirst,
out newRun,
out newRunLength
);
if (newBufferRange.Length > 0 && newBufferRange[0] == TextStore.CharLineFeed)
{
// Merge the 2 runs.
int lengthOfRun = 2;
char[] characterArray = new char[lengthOfRun];
characterArray[0] = TextStore.CharCarriageReturn;
characterArray[1] = TextStore.CharLineFeed;
TextRun mergedTextRun = new TextCharacters(characterArray, 0, lengthOfRun, textRun.Properties);
return new SimpleRun(lengthOfRun, mergedTextRun, (Flags.EOT | Flags.Ghost), settings.Formatter);
}
}
return new SimpleRun(runLength, textRun, (Flags.EOT | Flags.Ghost), settings.Formatter);
}
else if (charString[0] == TextStore.CharLineFeed)
{
// LF in the middle of text stream treated as explicit paragraph break
// simple hard line break
runLength = 1;
return new SimpleRun(runLength, textRun, (Flags.EOT | Flags.Ghost), settings.Formatter);
}
else if (canProcessTabsInSimpleShapingPath && charString[0] == TextStore.CharTab)
{
return CreateSimpleRunForTab(settings,
textRun,
idealRunOffsetUnRounded);
}
// attempt to create a simple run for text
run = CreateSimpleTextRun(
charString,
textRun,
settings.Formatter,
widthLeft,
settings.Pap.EmergencyWrap,
canProcessTabsInSimpleShapingPath
);
if (run == null)
{
// fail to create simple text run, the run content is too complex
return null;
}
// Check for underline condition
if (textDecorations != null && textDecorations.Count == 1 )
{
run.Underline = textDecorations[0];
}
}
else if (textRun is TextEndOfLine)
{
run = new SimpleRun(runLength, textRun, (Flags.EOT | Flags.Ghost), settings.Formatter);
}
else if (textRun is TextHidden)
{
// hidden run
run = new SimpleRun(runLength, textRun, Flags.Ghost, settings.Formatter);
}
return run;
}
/// <summary>
/// Creating a simple text run
/// </summary>
/// <param name="settings">text formatting settings</param>
/// <param name="cp">first cp of the run</param>
/// <param name="cpFirst">first cp of the line</param>
/// <param name="widthLeft">maxium run width</param>
/// <param name="widthMax">maximum column width</param>
/// <param name="idealRunOffsetUnRounded">run's offset from the beginning of the line</param>
/// <returns>a SimpleRun object</returns>
static public SimpleRun Create(
FormatSettings settings,
int cp,
int cpFirst,
int widthLeft,
int widthMax,
int idealRunOffsetUnRounded
)
{
TextRun textRun;
int runLength;
CharacterBufferRange charBufferRange = settings.FetchTextRun(
cp,
cpFirst,
out textRun,
out runLength
);
return Create(
settings,
charBufferRange,
textRun,
cp,
cpFirst,
runLength,
widthLeft,
idealRunOffsetUnRounded
);
}
