Data Structures | Public Types | Public Member Functions | Data Fields | Static Public Attributes

FallbackParagraphLayout Class Reference

Class handling the splitting of a paragraph of text into lines and visual runs. More...

Inheritance diagram for FallbackParagraphLayout:
ParagraphLayouter

Data Structures

class  FallbackLine
 A single line worth of VisualRuns. More...
class  FallbackVisualRun
 Visual run contains data about the bit of text with the same font. More...

Public Types

typedef WChar CharType
 Helper for GetLayouter, to get the right type.

Public Member Functions

 FallbackParagraphLayout (WChar *buffer, int length, FontMap &runs)
 Create a new paragraph layouter.
void Reflow ()
 Reset the position to the start of the paragraph.
const ParagraphLayouter::LineNextLine (int max_width)
 Construct a new line with a maximum width.

Data Fields

const WCharbuffer_begin
 Begin of the buffer.
const WCharbuffer
 The current location in the buffer.
FontMapruns
 The fonts we have to use for this paragraph.

Static Public Attributes

static const bool SUPPORTS_RTL = false
 Helper for GetLayouter, to get whether the layouter supports RTL.

Detailed Description

Class handling the splitting of a paragraph of text into lines and visual runs.

One constructs this class with the text that needs to be split into lines. Then nextLine is called with the maximum width until NULL is returned. Each nextLine call creates VisualRuns which contain the length of text that are to be drawn with the same font. In other words, the result of this class is a list of sub strings with their font. The sub strings are then already fully laid out, and only need actual drawing.

The positions in a visual run are sequential pairs of X,Y of the begin of each of the glyphs plus an extra pair to mark the end.

Note:
This variant does not handle left-to-right properly. This is supported in the one ParagraphLayout coming from ICU.

Definition at line 235 of file gfx_layout.cpp.


Member Typedef Documentation

Helper for GetLayouter, to get the right type.

Definition at line 238 of file gfx_layout.cpp.


Constructor & Destructor Documentation

FallbackParagraphLayout::FallbackParagraphLayout ( WChar buffer,
int  length,
FontMap runs 
)

Create a new paragraph layouter.

Parameters:
buffer The characters of the paragraph.
length The length of the paragraph.
runs The font mapping of this paragraph.

Definition at line 424 of file gfx_layout.cpp.

References SmallVector< T, S >::End().


Member Function Documentation

const ParagraphLayouter::Line * FallbackParagraphLayout::NextLine ( int  max_width  )  [virtual]

Construct a new line with a maximum width.

Parameters:
max_width The maximum width of the string.
Returns:
A Line, or NULL when at the end of the paragraph.

Implements ParagraphLayouter.

Definition at line 442 of file gfx_layout.cpp.

References SmallVector< T, S >::Append(), SmallVector< T, S >::Begin(), buffer, buffer_begin, SmallVector< T, S >::End(), GetCharacterWidth(), FontCache::GetSize(), FallbackParagraphLayout::FallbackLine::GetWidth(), IsTextDirectionChar(), IsWhitespace(), SmallVector< T, S >::Length(), and runs.


Field Documentation

const bool FallbackParagraphLayout::SUPPORTS_RTL = false [static]

Helper for GetLayouter, to get whether the layouter supports RTL.

Definition at line 240 of file gfx_layout.cpp.


The documentation for this class was generated from the following file: