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Analysis

Overview

• See WRAPPING_TEXT_RENDERING_R0

Task requirements

• Add basic text wrapping around a Frame with a higher z-order than the current Frame.
• Text will be flowed line by line following the example:

• Wrapping options
  • none - text is not wrapped
  • before - text wraps only on the left side
  • after - text wraps only on the right side
  • parallel (default) - text wraps from both sides
  • Default option (parallel).
• In this revision only the parallel will be implemented. However the others remains optional.

Task result

The result of this task is source code.

Implementation idea

• The text layout is based on HillClimbing algorithm.
• Flowing text not only to a single area, but also to a list of areas (having different shapes) is available.
• From the area of the current Frame subtract all intersecting Frames' areas and produce a list of areas.
• Pass the list to the algorithm.

Related

WRAPPING_TEXT_RENDERING_R0

How to demo

See WRAPPING_TEXT_RENDERING_R0

Design

• Add method PageWorkArea.getOverlappingArea(FrameView) to calculate the union of overlapping frames' areas:
  • Get the areas of all FrameViews with z-order higher than the current Frame
  • Make union of these areas.
  • Note: For correct calculations the space of each FrameView should be converted to the space of the current Frame.
• Modify HotTextSceneElementImpl.textLayout() method to:
  • Consider if the current Frame has single selection, so that wrapping is disabled (the user should be able to edit the selected frame without wrapping).
  • Calculate the layout area:
    • Find overlapping area using PageWorkArea.getOverlappingArea
    • Subtract overlapping area from the current Frame's area.
  • Use the calculated ImmArea (possibly containing a complex shape) as a parameter to HotTextLayout.layout
• Correct EdgeKind.OPEN_LINE and EdgeKind.SEGMENT to consider the case of more than one segment on a line.
  • BasePoint calculation should be corrected
• Testing:
  • Use the ​TextDemo and try:
    • Type some text into the first frame.
    • Select the second frame -> the text in the first wraps around.
    • Move and/or rotate the second frame -> the text in the first wraps around.
  • Unit test:
    • LayoutBuilderTest.testLayout added [3291]
    • All tests in LayoutBuilderTest can be used to check this task.

Implementation

Code added to the clean private branch nenko/nenko2

[3246]

[3254]

[3355]

[3374]

[3373] - Fix of the known bug with two consecutive new lines entered and real fix of the bug with ascent when changing the font size (1701?).

Testing

^{(Place the testing results here.)}

Comments

^{(Write comments for this or later revisions here.)}