private void PaintLineBackgroundAndExcludeSelectedTextFromClipRegion(DeviceContext deviceContext, PaintOptions paintOptions,
ScriptLine* scriptLine, ScriptParagraph* scriptParagraph,
int scriptRunIndex, int scriptRunCount, int* visualToLogicalMap,
int xStartPosition, int xEndPosition,
Rectangle layoutRect, int selectedCharIndex, int selectedCharCount)
{
IntPtr brush = DeviceContext.GetStockObject(NativeConstants.DC_BRUSH);
deviceContext.SetDCBrushColor(paintOptions.SelectedBackgroundColor);
int yCurrentBaseline = scriptLine->Y + scriptLine->Ascent;
int xCurrentPosition = scriptLine->X;
for (int i = 0; i < scriptRunCount; i++)
{
int logicalScriptRunIndex = visualToLogicalMap[currentLayoutRightToLeft ? scriptRunCount - i - 1 : i];
ScriptRun* scriptRun = scriptParagraph->ScriptRuns + logicalScriptRunIndex + scriptRunIndex;
int measuredWidth;
switch (scriptRun->RunKind)
{
case RunKind.Text:
{
int glyphIndexInParagraph, glyphCount;
int truncatedLeadingCharsCount = logicalScriptRunIndex == 0
? scriptLine->TruncatedLeadingCharsCount
: 0;
int truncatedTrailingCharsCount = logicalScriptRunIndex == scriptRunCount - 1
? scriptLine->TruncatedTrailingCharsCount
: 0;
measuredWidth = MeasureTextScriptRun(scriptParagraph, scriptRun,
truncatedLeadingCharsCount, truncatedTrailingCharsCount,
out glyphIndexInParagraph, out glyphCount);
if (xCurrentPosition + measuredWidth > xStartPosition)
{
int scriptRunCharIndex = scriptParagraph->CharIndex + scriptRun->CharIndexInParagraph;
int leadingCharIndex = scriptRunCharIndex + truncatedLeadingCharsCount;
int trailingCharIndex = scriptRunCharIndex + scriptRun->CharCount -
truncatedTrailingCharsCount;
if (trailingCharIndex >= selectedCharIndex &&
leadingCharIndex <= selectedCharIndex + selectedCharCount)
{
int relativePositionOfSelection;
if (leadingCharIndex >= selectedCharIndex)
{
relativePositionOfSelection = 0;
}
else
{
relativePositionOfSelection = MeasureTextScriptRun(scriptParagraph, scriptRun,
truncatedLeadingCharsCount,
truncatedTrailingCharsCount + trailingCharIndex - selectedCharIndex,
out glyphIndexInParagraph, out glyphCount);
}
int measuredWidthOfSelection;
if (trailingCharIndex <= selectedCharIndex + selectedCharCount)
{
measuredWidthOfSelection = measuredWidth - relativePositionOfSelection;
}
else
{
measuredWidthOfSelection = MeasureTextScriptRun(scriptParagraph, scriptRun,
truncatedLeadingCharsCount + Math.Max(selectedCharIndex - leadingCharIndex, 0),
truncatedTrailingCharsCount + trailingCharIndex - selectedCharIndex -
selectedCharCount,
out glyphIndexInParagraph, out glyphCount);
}
int x = currentLayoutRightToLeft
? layoutRect.Right - xCurrentPosition - measuredWidth
: layoutRect.Left + xCurrentPosition;
int y = layoutRect.Top + yCurrentBaseline - scriptRun->Ascent;
if (scriptRun->ScriptAnalysis.fRTL)
x += measuredWidth - relativePositionOfSelection - measuredWidthOfSelection;
else
x += relativePositionOfSelection;
Rectangle selectedRect = new Rectangle(x, y, measuredWidthOfSelection, scriptRun->Height);
deviceContext.FillRect(selectedRect, brush);
deviceContext.ExcludeClipRect(selectedRect);
}
}
break;
}
case RunKind.Object:
case RunKind.Tab:
{
measuredWidth = scriptRun->RunKind == RunKind.Object
? MeasureObjectScriptRun(scriptRun)
: MeasureTabScriptRun(scriptRun,
GetParagraphStyleAssumingItHasAtLeastOneRun(scriptParagraph),
xCurrentPosition, false);
if (xCurrentPosition + measuredWidth > xStartPosition)
{
int leadingCharIndex = scriptParagraph->CharIndex + scriptRun->CharIndexInParagraph;
int trailingCharIndex = leadingCharIndex + 1;
if (trailingCharIndex >= selectedCharIndex &&
leadingCharIndex <= selectedCharIndex + selectedCharCount)
{
int x = currentLayoutRightToLeft
? layoutRect.Right - xCurrentPosition - measuredWidth
: layoutRect.Left + xCurrentPosition;
int y = layoutRect.Top + yCurrentBaseline - scriptRun->Ascent;
Rectangle selectedRect = new Rectangle(x, y, measuredWidth, scriptRun->Height);
deviceContext.FillRect(selectedRect, brush);
// Don't exclude clip rect for objects and tabs.
//deviceContext.ExcludeClipRect(selectedRect);
}
}
break;
}
default:
throw new NotSupportedException();
}
xCurrentPosition += measuredWidth;
if (xCurrentPosition >= xEndPosition)
break; // can't fit any more runs within the clip rectangle
}
}
private void PaintLineForeground(DeviceContext deviceContext, PaintOptions paintOptions,
ScriptLine* scriptLine, ScriptParagraph* scriptParagraph,
int scriptRunIndex, int scriptRunCount, int* visualToLogicalMap,
int xStartPosition, int xEndPosition,
Rectangle layoutRect, bool isSelected, bool skipObjects)
{
int yCurrentBaseline = scriptLine->Y + scriptLine->Ascent;
int xCurrentPosition = scriptLine->X;
for (int i = 0; i < scriptRunCount; i++)
{
int logicalScriptRunIndex = visualToLogicalMap[currentLayoutRightToLeft ? scriptRunCount - i - 1 : i];
ScriptRun* scriptRun = scriptParagraph->ScriptRuns + logicalScriptRunIndex + scriptRunIndex;
int measuredWidth;
switch (scriptRun->RunKind)
{
case RunKind.Text:
{
Style style = document.LookupStyle(scriptRun->StyleIndex);
ScriptMetrics scriptMetrics = deviceContext.SelectFont(style.Font);
int glyphIndexInParagraph, glyphCount;
measuredWidth = MeasureTextScriptRun(scriptParagraph, scriptRun,
logicalScriptRunIndex == 0 ? scriptLine->TruncatedLeadingCharsCount : 0,
logicalScriptRunIndex == scriptRunCount - 1 ? scriptLine->TruncatedTrailingCharsCount : 0,
out glyphIndexInParagraph, out glyphCount);
if (glyphCount > 0 && xCurrentPosition + measuredWidth > xStartPosition)
{
int x = currentLayoutRightToLeft
? layoutRect.Right - xCurrentPosition - measuredWidth
: layoutRect.Left + xCurrentPosition;
int y = layoutRect.Top + yCurrentBaseline - scriptRun->Ascent;
deviceContext.SetTextColor(isSelected ? paintOptions.SelectedTextColor : style.Color);
ScriptTextOut(deviceContext.HDC, ref scriptMetrics.ScriptCache, x, y,
ExtTextOutOptions.NONE, null, &scriptRun->ScriptAnalysis,
scriptParagraph->Glyphs + glyphIndexInParagraph,
glyphCount,
scriptParagraph->GlyphAdvanceWidths + glyphIndexInParagraph,
null,
scriptParagraph->GlyphOffsets + glyphIndexInParagraph);
}
break;
}
case RunKind.Object:
{
measuredWidth = MeasureObjectScriptRun(scriptRun);
if (!skipObjects && xCurrentPosition + measuredWidth > xStartPosition)
{
int embeddedObjectCharIndex = scriptRun->CharIndexInParagraph + scriptParagraph->CharIndex;
EmbeddedObjectHost embeddedObjectHost;
if (embeddedObjectHosts.TryGetValue(embeddedObjectCharIndex, out embeddedObjectHost))
{
if (embeddedObjectHost.RequiresPaint)
{
using (Graphics g = Graphics.FromHdc(deviceContext.HDC))
{
Rectangle bounds = GetDrawingBoundsOfEmbeddedObject(embeddedObjectHost, layoutRect.Location);
embeddedObjectHost.Paint(g, paintOptions, bounds, currentLayoutRightToLeft);
}
}
}
}
break;
}
case RunKind.Tab:
{
measuredWidth = MeasureTabScriptRun(scriptRun,
GetParagraphStyleAssumingItHasAtLeastOneRun(scriptParagraph),
xCurrentPosition, false);
break;
}
default:
throw new NotSupportedException();
}
xCurrentPosition += measuredWidth;
if (xCurrentPosition >= xEndPosition)
break; // can't fit any more runs within the clip rectangle
}
}
private void FinishScriptLineLayout(ScriptLine* scriptLine, ScriptParagraph* scriptParagraph,
bool mustLayoutObjects)
{
int ascent = MinimumScriptLineHeight;
int descent = 0;
ScriptRun* startScriptRun = scriptParagraph->ScriptRuns + scriptLine->ScriptRunIndex;
ScriptRun* endScriptRun = startScriptRun + scriptLine->ScriptRunCount;
for (ScriptRun* scriptRun = startScriptRun; scriptRun != endScriptRun; scriptRun++)
{
int scriptRunDescentAndMargin = scriptRun->Descent + scriptRun->BottomMargin;
int scriptRunAscentAndMargin = scriptRun->Ascent + scriptRun->TopMargin;
if (scriptRunAscentAndMargin > ascent)
ascent = scriptRunAscentAndMargin;
if (scriptRunDescentAndMargin > descent)
descent = scriptRunDescentAndMargin;
}
int height = ascent + descent;
scriptLine->Height = height;
scriptLine->Descent = descent;
if (mustLayoutObjects)
{
int xCurrentPosition = scriptLine->X;
int scriptRunIndex = scriptLine->ScriptRunIndex;
int scriptRunCount = scriptLine->ScriptRunCount;
int* visualToLogicalMap = GetTempVisualToLogicalMap(
scriptParagraph->ScriptRuns + scriptRunIndex,
scriptRunCount);
for (int i = 0; i < scriptRunCount; i++)
{
int logicalScriptRunIndex =
visualToLogicalMap[currentLayoutRightToLeft ? scriptRunCount - i - 1 : i];
ScriptRun* scriptRun = scriptParagraph->ScriptRuns + logicalScriptRunIndex + scriptRunIndex;
int measuredWidth;
switch (scriptRun->RunKind)
{
case RunKind.Text:
{
int glyphIndexInParagraph, glyphCount;
int truncatedLeadingCharsCount = logicalScriptRunIndex == 0
? scriptLine->TruncatedLeadingCharsCount
: 0;
int truncatedTrailingCharsCount = logicalScriptRunIndex == scriptRunCount - 1
? scriptLine->TruncatedTrailingCharsCount
: 0;
measuredWidth = MeasureTextScriptRun(scriptParagraph, scriptRun,
truncatedLeadingCharsCount, truncatedTrailingCharsCount,
out glyphIndexInParagraph, out glyphCount);
break;
}
case RunKind.Object:
{
measuredWidth = scriptRun->ABC.TotalWidth;
EmbeddedObjectHost embeddedObjectHost;
int charIndex = scriptRun->CharIndexInParagraph + scriptParagraph->CharIndex;
if (embeddedObjectHosts.TryGetValue(charIndex, out embeddedObjectHost))
{
embeddedObjectHost.LayoutBounds = new Rectangle(
xCurrentPosition + scriptRun->ABC.abcA,
scriptLine->Y + scriptLine->Ascent - scriptRun->Ascent,
scriptRun->ABC.abcB,
scriptRun->Height);
pendingEmbeddedObjectHostsToShow.Enqueue(embeddedObjectHost);
}
break;
}
case RunKind.Tab:
{
measuredWidth = scriptRun->ABC.abcB;
break;
}
default:
throw new NotSupportedException();
}
xCurrentPosition += measuredWidth;
}
}
}
