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ParagraphLayout: Added more utility methods

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* FirtOffsetOnLine(), LastOffsetOnLine(), and GetLineBounds()
This commit is contained in:
Stephan Aßmus 2014-01-18 10:28:48 +01:00
parent 8ed16a6959
commit e97d9097da
2 changed files with 73 additions and 0 deletions
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67
src/apps/haiku-depot/textview/ParagraphLayout.cpp
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@ -307,6 +307,73 @@ ParagraphLayout::LineIndexForOffset(int32 textOffset)
}
int32
ParagraphLayout::FirstOffsetOnLine(int32 lineIndex)
{
_ValidateLayout();
if (lineIndex < 0)
lineIndex = 0;
if (lineIndex > fLineInfos.CountItems())
lineIndex = fLineInfos.CountItems() - 1;
return fLineInfos.ItemAt(lineIndex).textOffset;
}
int32
ParagraphLayout::LastOffsetOnLine(int32 lineIndex)
{
_ValidateLayout();
if (lineIndex < 0)
lineIndex = 0;
if (lineIndex >= fLineInfos.CountItems() - 1)
return CountGlyphs();
return fLineInfos.ItemAt(lineIndex + 1).textOffset - 1;
}
void
ParagraphLayout::GetLineBounds(int32 lineIndex, float& x1, float& y1,
float& x2, float& y2)
{
_ValidateLayout();
if (fGlyphInfos.CountItems() == 0) {
x1 = 0.0f;
y1 = 0.0f;
x2 = 0.0f;
y2 = 0.0f;
return;
}
if (lineIndex < 0)
lineIndex = 0;
if (lineIndex > fLineInfos.CountItems())
lineIndex = fLineInfos.CountItems() - 1;
const LineInfo& lineInfo = fLineInfos.ItemAt(lineIndex);
int32 firstGlyphIndex = lineInfo.textOffset;
int32 lastGlyphIndex;
if (lineIndex < fLineInfos.CountItems() - 1)
lastGlyphIndex = fLineInfos.ItemAt(lineIndex + 1).textOffset - 1;
else
lastGlyphIndex = fGlyphInfos.CountItems() - 1;
const GlyphInfo& firstInfo = fGlyphInfos.ItemAtFast(firstGlyphIndex);
const GlyphInfo& lastInfo = fGlyphInfos.ItemAtFast(lastGlyphIndex);
x1 = firstInfo.x;
y1 = lineInfo.y;
x2 = lastInfo.x + lastInfo.width;
y1 = lineInfo.y + lineInfo.height;
}
void
ParagraphLayout::GetTextBounds(int32 textOffset, float& x1, float& y1,
float& x2, float& y2)

6
src/apps/haiku-depot/textview/ParagraphLayout.h
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@ -193,6 +193,12 @@ public:
int32 CountLines();
int32 LineIndexForOffset(int32 textOffset);
int32 FirstOffsetOnLine(int32 lineIndex);
int32 LastOffsetOnLine(int32 lineIndex);
void GetLineBounds(int32 lineIndex,
float& x1, float& y1,
float& x2, float& y2);
void GetTextBounds(int32 textOffset,
float& x1, float& y1,