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User:Uri/Bidi editing: Difference between revisions
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Bidirectional text is stored logically, and (obviously) displayed visually. The caret, being a graphical element, corresponds to a visual location. The user can manipulate text and move the caret through a combination of '''logical functions''' (such as typing or deleting) and '''visual functions''' (such as using the arrow keys). Therefore, the problem of mapping between logical and visual positions in a way which will meet the expectations of the user is the central problem of bidirectional editing. | Bidirectional text is stored logically, and (obviously) displayed visually. The caret, being a graphical element, corresponds to a visual location. The user can manipulate text and move the caret through a combination of '''logical functions''' (such as typing or deleting) and '''visual functions''' (such as using the arrow keys). Therefore, the problem of mapping between logical and visual positions in a way which will meet the expectations of the user is the central problem of bidirectional editing. | ||
At this point, I would like to recommend reading [http://www-306.ibm.com/software/globalization/topics/bidiui/index.jsp Guidelines of a Logical User Interface (UI) for Editing Bidirectional Text] by Matitiahu Allouche of IBM. This document presents a method for dealing with the problems associated with BiDi editing. It contains some useful definitions, as well as a detailed description of a logical-to-visual mapping algorithm (in the "[http://www-306.ibm.com/software/globalization/topics/bidiui/conversion.jsp Conversion of cursor positions]" section). This document is the basis of the current Mozilla bidi editing implementation (which I'll describe below). I'd like to thank Simon Montagu for introducing me to this document. | At this point, I would like to recommend reading [http://www-306.ibm.com/software/globalization/topics/bidiui/index.jsp Guidelines of a Logical User Interface (UI) for Editing Bidirectional Text] by Matitiahu Allouche of IBM. This document presents a method for dealing with the problems associated with BiDi editing. It contains some useful definitions, as well as a detailed description of a logical-to-visual mapping algorithm (in the "[http://www-306.ibm.com/software/globalization/topics/bidiui/conversion.jsp Conversion of cursor positions]" section). This document is the basis of the current Mozilla bidi editing implementation (which I'll describe below). I'd like to thank Simon Montagu for introducing me to this document, which I'll hereby refer to as "the IBM document" (or "the IBM algorithm"). | ||
==The current Mozilla implementation== | ==The current Mozilla implementation== | ||