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TextDocumentLayout: Added more utility methods

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* CountLines(), FirstOffsetOnLine(), LastOffsetOnLine(), GetLineBounds().
* Common code for finding a line in _ParagraphLayoutIndexForLineIndex()
This commit is contained in:
Stephan Aßmus 2014-01-18 10:30:05 +01:00
parent e97d9097da
commit 00d04bc7f2
2 changed files with 92 additions and 0 deletions
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83
src/apps/haiku-depot/textview/TextDocumentLayout.cpp
View File

@ -123,6 +123,69 @@ TextDocumentLayout::LineIndexForOffset(int32 textOffset)
}
int32
TextDocumentLayout::FirstOffsetOnLine(int32 lineIndex)
{
int32 index = _ParagraphLayoutIndexForLineIndex(lineIndex);
if (index >= 0) {
const ParagraphLayoutInfo& info = fParagraphLayouts.ItemAtFast(index);
return info.layout->FirstOffsetOnLine(lineIndex);
}
return 0;
}
int32
TextDocumentLayout::LastOffsetOnLine(int32 lineIndex)
{
int32 index = _ParagraphLayoutIndexForLineIndex(lineIndex);
if (index >= 0) {
const ParagraphLayoutInfo& info = fParagraphLayouts.ItemAtFast(index);
return info.layout->LastOffsetOnLine(lineIndex);
}
return 0;
}
int32
TextDocumentLayout::CountLines()
{
_ValidateLayout();
int32 lineCount = 0;
int32 count = fParagraphLayouts.CountItems();
for (int32 i = 0; i < count; i++) {
const ParagraphLayoutInfo& info = fParagraphLayouts.ItemAtFast(i);
lineCount += info.layout->CountLines();
}
return lineCount;
}
void
TextDocumentLayout::GetLineBounds(int32 lineIndex, float& x1, float& y1,
float& x2, float& y2)
{
int32 index = _ParagraphLayoutIndexForLineIndex(lineIndex);
if (index >= 0) {
const ParagraphLayoutInfo& info = fParagraphLayouts.ItemAtFast(index);
info.layout->GetLineBounds(lineIndex, x1, y1, x2, y2);
y1 += info.y;
y2 += info.y;
return;
}
x1 = 0.0f;
y1 = 0.0f;
x2 = 0.0f;
y2 = 0.0f;
}
void
TextDocumentLayout::GetTextBounds(int32 textOffset, float& x1, float& y1,
float& x2, float& y2)
@ -242,3 +305,23 @@ TextDocumentLayout::_ParagraphLayoutIndexForOffset(int32& textOffset)
return -1;
}
int32
TextDocumentLayout::_ParagraphLayoutIndexForLineIndex(int32& lineIndex)
{
_ValidateLayout();
int32 paragraphs = fParagraphLayouts.CountItems();
for (int32 i = 0; i < paragraphs; i++) {
const ParagraphLayoutInfo& info = fParagraphLayouts.ItemAtFast(i);
int32 lineCount = info.layout->CountLines();
if (lineIndex > lineCount) {
lineIndex -= lineCount;
continue;
}
return i;
}
return -1;
}

9
src/apps/haiku-depot/textview/TextDocumentLayout.h
View File

@ -87,6 +87,13 @@ public:
const BRect& updateRect);
int32 LineIndexForOffset(int32 textOffset);
int32 FirstOffsetOnLine(int32 lineIndex);
int32 LastOffsetOnLine(int32 lineIndex);
int32 CountLines();
void GetLineBounds(int32 lineIndex,
float& x1, float& y1,
float& x2, float& y2);
void GetTextBounds(int32 textOffset,
float& x1, float& y1,
@ -105,6 +112,8 @@ private:
int32 _ParagraphLayoutIndexForOffset(
int32& textOffset);
int32 _ParagraphLayoutIndexForLineIndex(
int32& lineIndex);
private:
float fWidth;