JPS5928918B2 - Cursor control method for character processing device - Google Patents

Description

[Detailed Description of the Invention] The present invention is a character processing device in which text information is displayed on a screen, in which text information at a position indicated by a cursor on the screen can be arbitrarily edited such as correction, insertion, deletion, etc. This relates to the cursor control method.

Text information is displayed on the screen using a display device such as a CRT or plasma display, and editing such as correcting, inserting, or deleting errors can be performed by pointing out the position of the displayed content with a cursor. A character processing device that can be used for text processing has been developed.

FIG. 1 is a diagram for explaining a cursor control method conventionally implemented in this type of device.

First, the cursor control method of the conventional device will be explained using the same figure. On the screen D where text information is displayed, a cursor for editing instructions appears directly below the text information, and input signals for moving the cursor left, right, up, and down given from the input device are used to The cursor has one character left, one character right,
Move one line directly above and one line directly below. Also, when you move the cursor to the left at the beginning of a line and move the cursor to the right at the end of a line, the cursor moves to the end of the previous line and the beginning of the next line, respectively. In the figure, KA1 to KA6 indicate cursor positions for explaining the cursor movement when moving to the right, KB1 to KB when moving to the left, and Kc1 to Kc4 when moving the cursor downward. Also I and CR
are special codes indicating that indent processing and line feed processing are to be performed, respectively, and BE is a special code indicating the end of a sentence where a series of text information ends. Although the cursor movement of the above-mentioned conventional device is quite common in terms of spatial movement of the cursor, there are problems in actual use. Generally, the raison d'être of a cursor is that editing operations such as insertion and correction are performed based on the current cursor position. Therefore, moving the cursor is nothing but moving the cursor from the current editing reference point to the new editing reference point. From this point of view, it is noticed that there is a lot of waste when performing the conventional cursor movement method on text information that has been subjected to indentation processing and line break processing as shown in FIG. In other words, when the cursor is moved from the current editing reference point KAl to the new editing reference point KA6 by moving the cursor to the right, KAl → KA2 → KA3 → KA4
→ KA5 → KA6 and 5 steps are required.

The situation is exactly the same when moving the cursor from KB1 to KB4 by moving left, and from KCl to KC4 by moving down and left. Here, position KA2~K on the screen
A5, KB2 to KB6, KO2 to KO3, that is, blank spaces at the beginning of a line when indentation processing is performed, blank spaces at the end of a line when line feed processing is performed, and spaces after the end of a sentence are generally input prohibited areas called protected areas. .

These areas occupy the space of 71 characters each, and appear as independent entities equivalent to normal characters.
However, in reality, these spaces are special codes such as indent processing 1 and line feed processing CR, and the number of characters for one line (1 in the case of Figure 1).
It is subordinate to editing parameters such as 6 characters). If you insert one character with the cursor currently at position KAl, the inserted character will enter position KAl and position K
“No” that was in Al moves to position KA6, and moves to position KA2~
Leave the space in KA5 as it is, and change the number below ``ko'' in position KA6 to 1.
An editing operation is performed in which the characters are shifted to the right by characters, the line feed processing CR is moved to position KB6, the blank space in KB6 disappears, and the blank spaces at positions KB5 to KB2 and the characters below position KBl remain as they are.

If the above input-prohibited area is an independent area like a normal character area, when a similar insertion operation is performed,
The turn at position KAl moves to KA2, the blanks in KA2 to KA5 and the characters and code CR in KA6 to KB7 are each shifted to the right by one character, and the blanks below KB6 are also shifted to the right by one character, resulting in the blank in KB2 being shifted to the right by one character. Moving to KBl, all characters below KBl should also be shifted to the right one character at a time. Based on the above explanation, place the cursor in the input prohibited area,
Not only is it meaningless to perform editing operations such as corrections and insertions, but also incorrect editing such as correcting blank spaces to characters is performed by placing the cursor at position KB5 and entering characters. There is also some fear. In other words, a protected area where input is prohibited cannot serve as an editing reference point. However, in conventional devices, the cursor remains at a position that cannot be used as an editing reference point, so the number of key operations in the input section is large and it takes a long time to move the cursor to the desired position. . The present invention provides a cursor control method that eliminates the drawbacks of the conventional devices and allows efficient cursor movement.

First, the movement of the cursor to the left, right, up, and down according to the present invention will be explained using display screen D in FIG. 2 on which text information similar to that in FIG. 1 is displayed.

In the figure, the cursor is moved to the right for position K.
The cursor display positions Kb7, KCl, KC2, and KC4 indicate downward movement, and Kal, Kb2, and Kaal indicate upward and downward movement. When the cursor is currently at position Kal, if a command is given to move the cursor to the right, the cursor passes through the input prohibited position and automatically moves to position Ka6, and is moved to the desired position with one key operation. Similarly, the crab at position Kbl moves to position Kb7 with one left movement command. Of course, it goes without saying that when the cursor is moved to the left or right in an area unrelated to the input-prohibited position, it is moved one character to the left or one character to the right, as in the conventional system. However, when moving the cursor up or down, it will not pass through the input prohibited area except under certain circumstances. For example, if you try to move the cursor at position Kaal to position Kal with two upward movement commands, the first upward movement command will move the cursor from position Kaal to position Kb.
7, it would be more inconvenient, and the intended purpose could not be achieved. Therefore, even if there is a blank space due to indent processing and line feed processing in the middle, moving from position Kaal to position Ka2 in the same way as in the conventional method. A move is made. Downward movement of the cursor is controlled in exactly the same way. Here, the specific situation when moving up and down is when the cursor is commanded to move beyond the input-prohibited area, especially the end-of-sentence area BE, because the cursor has no meaning beyond the end-of-sentence position. The cursor at position KCl does not move to position KC2, but moves to position KC4 at the end of the sentence. Note that this kind of control using the end-of-sentence code BE is also applied when the cursor is commanded to move to the right, and since there is no meaning in moving the cursor to a blank area at the end of a sentence, control is performed to avoid such waste. Ru. FIG. 3 schematically shows an input buffer for supplying display information to the display screen. Character codes are stored in correspondence with the display positions on the screen, and the input prohibited area contains the protect code PR and the end of sentence position. The end-of-sentence codes BE are stored in the corresponding areas. FIG. 4 is a block diagram showing the main parts of a character processing device for executing the above-mentioned cursor control method.

1 is an input device for inputting editing commands, and when keys for moving the cursor to the left, right, and up and down are pressed, an output signal C is output.
L, CR, CU, and CD are formed and given to the control device 2.

The control device 2 sends a counting signal CP to the up/down counter 3 based on the output signal of the input device 1.
Output U or CPD. The counter 3 gives the value of the cursor pointer CP, which is used to select the editing position from the character code information stored in the input buffer 4. 5 is a register that holds the protect code PR, 6 is a register that holds the character code in the input buffer 4 specified by the cursor pointer CP, and 7 is a register that holds the end-of-sentence code BE, which are the codes once held in each register. The information is given to a coincidence detection circuit 8 or 9, which detects whether the information at the specified position of the force-sol pointer CP is a preset input prohibition code or not, and forms coincidence signals Yl, Y2 or mismatch signals Nl, N2. Then, the data is transferred to the control device 2 for the next cursor position control.

Next, the operation of the above-mentioned program will be explained by citing a case where the movement of the cursor is different from that of the conventional device.

When moving one cursor to the left: When the left movement command signal CL is applied from the input device 1 to the control device 2, one clock signal CPD for counting down is sent out, and the value of the counter CP is decremented by one.

The code information stored in the address corresponding to the new count value in the input buffer 4 is read out and transferred to the coincidence detection circuit 8 via the register 6. In the coincidence detection circuit 8,
If it is determined whether the code information inputted from the register 6 is the protect code PR and a non-coincidence signal N1 is output, the movement of the cursor to the left is completed, and the control device 2 stops its operation. However, the coincidence signal Y1 from the coincidence detection circuit 8
is output, it means that the position of the cursor pointer CP at the count value decremented by 1 is determined to be an input prohibited area, and the control device 2 automatically outputs the clock signal CPD for further counting down. Send out one. The next area in the input buffer 4 is designated via the counter 3 by the clock signal CPD, and the match detection circuit 8 similarly executes determination of the code information read from the input buffer 4. The operation of counting down is repeated until the mismatch signal N1 is output for the first time. With the disagreement signal N1 being output, the control device 2 stops its operation and causes the position corresponding to the count of the counter 3 to appear on the screen as a new cursor position. 2 When moving the cursor to the right: Since the text is displayed from left to right on the screen, when the right movement command signal CR is given to the control device 2 from the input device 1, the output signal of the coincidence detection circuit 9 is first When the cursor is checked and the match signal Y2 is output, it is determined that the current cursor is already at the end of the sentence, and the control device 2 stops its operation.

In a state where the mismatch signal N2 is output, the control device 2
sends out one clock signal CPU for counting up, and increases the value of the counter CP by one. The code information stored in the address of the input cover J A4 corresponding to the count value of the new counter CP is read out to the register 6 and transferred to the match detection circuits 8 and 9 to determine whether it is the protect code PR or the end-of-sentence code BE. is determined. Coincidence detection circuit 8
While the coincidence signal Y1 is being output from , it is determined that the force cursor is in the protected area, and the control device 2 repeatedly moves the cursor pointer CP one by one to the right, and only then is the mismatch signal N1 or When the coincidence signal Y2 is output from the coincidence detection circuit 9 (however, the mismatch signal N1 is always output when the coincidence signal Y2 is output, so checking the N1 signal is sufficient for operation), the control device 2 stops operating. Then, the position corresponding to the count content of the force counter 3 is displayed on the screen as a new cursor position. 3 When moving the cursor downward: When the downward movement command signal CD is given from the input device 1, the control device 2 first checks the output signal of the coincidence detection circuit 9, and if the coincidence signal Y2 is output, it has already been detected. Since the cursor is at the end of the sentence, control device 2
stops working.

On the other hand, while the mismatch signal N2 is being output, the control device 2 sends out the clock signal CPU for counting up one by one to increase the value of the counter CP by one. Every time the counter CP increases by 1, the code information at the corresponding address of the input buffer 4 is read out and compared with the protect code PR and the end-of-sentence code BE in the match detection circuits 8 and 9. In the control device 2, the clock signal CPU sent for the above-mentioned counting up is counted in advance, and the clock count value is equal to the number of one line on the screen (in this embodiment, one line is counted).
6 characters) or when the match signal Y2 is output, the control device 2 stops the above operation and causes the contents of the counter 3 to appear on the screen as the new cursor position. That is, in the case of this cursor downward movement, regardless of the protect code PR, it is controlled only by the clock count value (the number of characters on the screen) and the coincidence signal Y2.
2, that is, in a state where the end-of-sentence code BE is not detected, the cursor is displayed even in the input-prohibited area. When the match signal Y2, that is, the end-of-sentence code is detected, the downward movement of the cursor beyond the end-of-sentence position is terminated at the end-of-sentence position. Incidentally, in the case of upward movement of the cursor, the same operation as in downward movement is performed, but since it is only an upward movement, it is of course unnecessary to check the output of the coincidence detection circuit 9 first.

In the above embodiment, it is clear that by setting a part of the screen area as an input-prohibited area in advance and writing an input-prohibition code in the input buffer, it is possible to execute a cursor path movement in that area regardless of the text information. .

As described above, according to the present invention, when the cursor is moved left or right, the cursor can be moved and displayed by jumping over the input prohibited area, and at the end of a sentence, right movement beyond the end of the sentence is prohibited, and when the cursor is moved up or down, it is prohibited to move beyond the end of the sentence. If there is no entry-prohibited area, the cursor is moved and displayed regardless of the input-prohibited area, and downward movement of the cursor beyond the end of the sentence is terminated at the end of the sentence.This allows the cursor to be moved efficiently and prevents erroneous input. It has the feature that editing operations in the text processing device can be made smooth and quick since the editing operations can be avoided in advance.

[Brief explanation of drawings]

Figure 1 is a diagram of the display screen to explain the conventional method, Figure 2
3 is a diagram schematically showing an input buffer according to the present invention, and FIG. 4 is a block diagram for explaining an embodiment according to the present invention. be. Kal? Ka6FKbl la Kb7? KCl La KC4: Esol position, 1: Input device, 2: Control device, 3: Counter, 4: Input buffer, 5, 6, 7: Register, 8, 9
: - match detection circuit, Yl, Y2: - match signal, Nl, N2:
Mismatch signal.

Claims (1)

[Claims] 1 In a character processing device that displays text information on a screen and edits the text information by moving the cursor position vertically and horizontally on the screen according to a cursor movement command given from an input unit, the text displayed on the screen is A memory device for storing each character code stores a specific code (first specific code) in a portion corresponding to the input prohibited position on the screen, and stores the first specific code in a portion corresponding to the end of sentence position on the screen.
A specific code (a second specific code) different from the specific code of 1 is stored, the contents of the memory up to the position to which the cursor is moved are detected when the cursor moves, and when the cursor moves to the left and right, the first When the specific code is detected, the cursor is moved over the input prohibited area corresponding to the specific code storage area, and when the second specific code is detected, the cursor is moved beyond the end position of the sentence corresponding to the specific code storage area. When the cursor is instructed to move up or down, if the second specific code is not detected, the cursor is moved regardless of the input prohibited area, and if the second specific code is detected, the cursor is prohibited from moving to the right. A cursor control method for a character processing device, characterized in that downward movement of the cursor beyond the end position of a sentence corresponding to a code storage portion is terminated at the end position of the sentence.