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Analysis

Overview

A paragraph is a self-contained unit of a discourse in writing dealing with a particular point or idea. The start of a paragraph is indicated by beginning on a new line. Sometimes the first line is indented; sometimes it is indented without beginning a new line. At various times the beginning of a paragraph has been indicated by the pilcrow: ¶. User should be able to specify spacing setting for specific paragraph via paragraph settings hud.
Identation defines where does the text begin in the frame.Following settings should present:

• Right indent - defines the space after the text, for now in points.
• Left indent - defines the space before the text, for now in points.
• First line indent - defines the space before the first line in the text, for now in points.
• Space above - defines the space above the paragraph, for now in points.
• Space below - defines the space below the paragraph, for now in points.
• Line spacing - defines spacing between the lines in the paragraph, in lines. The default is 1.

Task requirements

• Implement indent functionalities for the paragraph
• Create a paragraph hud(OPTIONAL IF NOT FINISHED WILL BE INCLUDED IN THE NEXT REVISION)
  • Should contain controls for align, character style and indents. (add only indent controls)

Task result

• The result should be code.

Implementation idea

• Review TEXT_PARAGPRAPH_FORMAT_COMMONS_R0 and don't get in to a conflict with implementation of this task.
• Also review what is implemented at this point.
• If there is a need review ​http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/text/StyleConstants.html
• See

Related

TEXT_PARAGPRAPH_FORMAT_COMMONS_R0
TEXT_PARAGRAPH_ALIGN_R0
TEXT_PARAGRAPH_STYLE_TEMPLATES_R0
TEXT_PARAGRAPH_CHAR_STYLE_R0
TEXT_PARAGRAPH_NEXT_STYLE_R0

DETACHED_TEXT_FRAME_EDITOR_R0 ​http://en.wikipedia.org/wiki/Paragraph

How to demo

• Run the application
• Create a new book and place text frame inside
• Populate some lorem ipsum text inside with a number of paragraphs(lorem ipsum generator --> ​http://www.lipsum.com/)
• Open the paragraph settings hud and manipulate spacing controls.

Design

• Add CommonAttr.PG_BEGIN and CommonAttr.PG_END attributes to represent existence of baragraph breaks in the style.
• Add HotTextLogic.INSERT_PARAGRAPH_BREAKS to represent the logic for properly adding paragraph attributes on enter in a HotText.

On enter:

• the HotUnit after the current caret position gets a derive HotStyleDef for its preStyle. The new style is concatination of the old one plus

PG_BEGIN attribute.

• the HotUnit before the current caret position gets a derive HotStyleDef for its postStyle. The new style is concatination of the old one plus

PG_END attribute.

• Create utility class ParagraphUtils with:
  • static method checkCorrectness(HotText) - checks if PG_BEGIN and PG_END are nested correctly(every begin attribute has it's end attribute and after a begin attribute only an end attribute can be placed).
  • static method existsBeginParagraph(HotStyleDef) - checks if there is PG_BEGIN in the specified style.
  • static method existsEndParagraph(HotStyleDef) - checks if there is PG_END in the specified style.
• Layout
  • Extend Atom class functionality with paragraph related attributes:
    • Add Atom.isParaBegin to check for PG_BEGIN attribute.
    • Modify Atom.isParaEnd to check for PG_END attribute.
    • Methods for indentation, top and bottom spacing, etc.
  • Add VertexFields values for the needed paragraph properties:
    • Alignment
    • Top spacing
    • Bottom spacing
    • Line spacing
    • First line indent
    • Left indent
    • right indent
  • Modify the layout algorithm:
    • EdgeKind.OPEN_LINE to check for PG_BEGIN .
    • EdgeKind.CLOSE_LINE to check for PG_END.
    • EdgeKind.SEGMENT to check for PG_BEGIN and PG_END .
    • To apply the paragraph visualization properties as follows:
      • EdgeKind.OPEN_LINE - top spacing, line spacing, first line indent, left indent, right indent.
      • EdgeKind.CLOSE_LINE - bottom spacing.
      • Note: Alignment will be handled in the layout algorithm in a next revision.
• Testing
  • TextParagraphDemo added for checking the correct behavior of paragraph functionality. [3424] [3433]
  • Unit testing: ​LayoutBuilderTest - updated in [3386]

Implementation

• Initial implementation in branch ​branches/private/vlado/paragraph-changes.
  • [3781]
  • [3838]
  • [3839]
  • [3862]
  • Other changesets are not relevant.
• Merged implementation in branch ​branches/private/vlado/merge-text-tasks.
  • [4065]
• Known issue - indentation does not work for the first paragraph. To be corrected in the next revision after fixing the initializing text.

Testing

^{(Place the testing results here.)}

Comments

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