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Cursor Left/Right/Up/Down

IP.com Disclosure Number: IPCOM000049518D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Adam, TL: AUTHOR [+9]

Abstract

Directional cursor positioning keys are provided to allow an operator to move a cursor to a desired point of revision within a document or to any point within a text viewport. In each case, the function of the four keys depends upon the position of the cursor at the time a a directional key is depressed.

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This is the abbreviated version, containing approximately 53% of the total text.

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Cursor Left/Right/Up/Down

Directional cursor positioning keys are provided to allow an operator to move a cursor to a desired point of revision within a document or to any point within a text viewport. In each case, the function of the four keys depends upon the position of the cursor at the time a a directional key is depressed.

More specifically, if the cursor is positioned in an area containing text, then the cursor left/right keys act as character return/ advance keys. In other words, the cursor moves through the text one character at a time but not necessarily one character position at a time. For example, if the cursor is positioned on a required backspace character and the cursor right key is depressed, then the cursor "advances" to the next text character which will be one character position to the left.

If the operator is in an area containing text and cursors up or down into an empty, "white", space following a tab character, then cursoring to the right moves the cursor to the character following the tab and cursoring to the left moves the cursor to the tab.

If the cursor is in an area containing no text (e.g., to the right of a carrier return or required carrier return character on a line), then the cursor left/right keys act as character position return/advance keys.

The function of the cursor up/down keys also depends upon the position of the cursor on the display image. That is, if the cursor is moved up past the first line of a page, the system stores the page and then reads the previous page. The last line (i.e., the page end code) of the previous page is placed on the last line of the te...