JP2578884B2 - Display text scrolling execution method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A scroll execution method for a display text displayed on a display device is provided for the purpose of preventing the occurrence of duplicate display when one logical line is not one physical line, and a scroll request is made. Scroll execution means for sequentially extracting the original data with logical line data when there is a
A first temporary buffer for temporarily storing logical line data extracted by the through-roll executing means, and a second temporary buffer for temporarily storing logical line data extracted by the scroll executing means in the reverse direction. And a screen buffer for storing a plurality of logical line data input through the first and second temporary buffers, so that a scroll execution method for executing scrolling of a display text displayed on a display device is provided. Line type determining means for determining the line type of the physical line data located at the start line and the end line of the screen buffer is provided. Based on the result of the determination by the scroll executing unit and the line type determining unit, Physical row data information of logical row data stored in the second temporary buffer , And so as not to overlap with the physical row data located at the start line and end line of the screen buffer after execution of the scroll processing, configured to execute the scrolling.

[Industrial applications]

The present invention relates to a scroll execution method for a display text displayed on a display device, and more particularly to a scroll execution method for a display text when one logical line manages the display text in logical line units other than one physical line. It is.

[Conventional technology]

For example, in the basic screen displayed by the basic LIST instruction, one logical line corresponds to three physical lines, and the display text is managed using the three physical lines as a basic unit. Therefore, the so-called scrolling process of moving the display text on the display device is also executed using these three physical lines as a basic unit.

[Problems to be solved by the invention]

Next, with reference to FIG. 9, a description will be given of the problem of the scroll processing executed on the basis of such a plurality of physical lines. From the display state as shown in FIG. 9 (A), by executing the upward scroll using the cursor, the “line number 20” is displayed.
It is assumed that up to the "a line" is deleted from the screen and the display state shown in FIG. 9B is obtained. From this display state, when scrolling down using the cursor this time, as shown in FIG. 9 (C), “line number” constituting logical line data is displayed.
20 rows a, b, and c "were left.
Line ". In other words, unless scrolling is performed in units of three physical lines, such a duplicated display will appear, giving the operator the illusion that the program has been destroyed.

This is because, as shown in Fig. 10, temporary buffers provided above and below the screen buffer provided for managing display text and operating to sequentially send logical line data to the screen buffer remain in the screen buffer. This is because all the physical row data of the logical row data to which the physical row data belongs are stored.

The present invention has been made in view of such circumstances, and
Even when a logical row does not correspond to one physical row,
It is an object of the present invention to provide a scroll execution method for preventing a redundant display from appearing when a display text is scrolled.

[Means for solving the problem]

FIG. 1 is a diagram illustrating the principle of the present invention. In the figure, reference numeral 1 denotes original data, and a part of the original data is
Will be displayed as display text. Reference numeral 2 denotes a scroll executing means for executing a process of sequentially extracting the original data 1 with logical line data in order to scroll the display text displayed on the display device 30 when there is a scroll request. This logical row data is, for example, three physical row data,
It is basically composed of a plurality of physical row data.
Reference numeral 3 denotes a first temporary buffer, which temporarily stores the logical row data extracted by the scroll execution means 2. Reference numeral 4 denotes a second temporary buffer, which is provided corresponding to the first temporary buffer 3, and
Temporarily stores the logical line data extracted by the scroll execution unit 2 in the direction opposite to the logical line data sent to the temporary buffer 3 of the logical buffer. 5 is a screen buffer which forms a buffer for display text,
A plurality of logical row data input via the first and second temporary buffers 3 and 4 are stored. 6 is a start line of the screen buffer 5 and is located adjacent to the first temporary buffer 3, and 7 is an end line of the screen buffer 5 and is located adjacent to the second temporary buffer 4. Numeral 8 denotes a line type judging means which determines whether the physical line data in the start line 6 and the end line 7 is the first line, intermediate line (or plural lines) or last line in the logical line data to which it belongs. Judge whether it is applicable. And
Reference numeral 30 denotes a display device for displaying a display text.

[Action]

According to the present invention, the scroll execution means 2 converts the physical row data information of the logical row data stored in the first and second temporary buffers 3 and 4 into a scroll processing based on the determination result of the row type determination means 8. Is executed to execute scrolling so as not to overlap with the physical row data located in the start row 6 and the end row 7 after the execution of.

By this operation, the physical row data stored in the first temporary buffer 3 and the physical row data located in the start row 6 form one logical row data, and the physical row data stored in the second temporary buffer 4 Since one logical row data is formed by the data and the physical row data located in the end row 7, the scroll is executed in a unit of physical row, so that there is no overlapping display.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to examples.

FIG. 2 shows a system configuration diagram of the present invention. As shown in FIG. 1, the present invention provides a data processing device 20 having a scroll
Is displayed on the display device 30 as display text, and the display text is to be scrolled on the original data 1 at the request of the operator.

In order to realize the scroll processing, the display text is managed by the line management table 21 and the first temporary buffer 3, the second temporary buffer 4, and the screen buffer 5 set on the buffer memory 22. Become. Here, the screen buffer 5 directly manages the display text on the display screen, and the first temporary buffer 3 saves the text beyond the start line (top line) of the display screen by the upward scroll operation. , The second temporary buffer is provided to save text beyond the end line (bottom line) of the display screen by a downward scroll operation. However, part of the text to be saved in the first and second temporary buffers 3 and 4 remains in the screen buffer 5.

On the other hand, the row management table 21 indicates that 1
For each line, “input flag”, “number of ANK characters”, “number of bytes”,
Information such as “temporary flag” and “field flag” is managed. Here, “input flag” indicates the corrected line, “ANK character number” indicates the number of ANK conversion characters in one line, “byte number” indicates the number of bytes in one line, and “temporary flag” indicates the data in temporary buffers 3 and 4. Is set. The "field flag" characteristic of the present invention is that the first line (hereinafter sometimes referred to as TOP) or the middle line (hereinafter sometimes referred to as MID) of the text is the last line (hereinafter referred to as END). ).

Before starting the detailed description of the scroll execution method of the present invention, the TOP, MID, and END will be described with specific examples. As shown in FIG. 3 (A), it is assumed that a basic program having line numbers 10 to 20 has been created. In this program, it is assumed that one line number can contain a program with a maximum of 200 characters. Numerals in parentheses in FIG. 3A represent the number of characters in each line number. On the other hand, it is assumed that the display device can display only a maximum of 80 characters for one line (this is a physical line). In such a case, the basic program with one line number is displayed on the display device by being divided into a maximum of three lines (these logical lines). From now on, according to the present invention, as shown in FIG.
We decided to call P, the middle line MID, and the last line END. However, a program that ends with less than 80 characters, such as the program with line number 30, will have only TOP.

Next, the operation of the upward scroll processing of the present invention will be described with reference to the flowchart shown in FIG. Here, the upward scrolling process refers to a process of shifting the display text upward by one line as shown in FIG. 9B, whereas the below-described scrolling process described in FIG. As shown in FIG. 9C, this is a process of shifting the display text downward by one line.

When there is an upward scroll request from the operator, the scroll execution means 2 first checks the field flags managed in the row management table 21 in step 10 so that the physical row data located at the start row is TOP, MID, It is determined which of the ENDs is applicable, and if it is TOP, it is further determined whether it is the TOP of logical row data composed of a plurality of physical rows or the TOP of logical row data composed of a single physical row. Is this the TOP of a single physical row or the TOP of multiple physical rows?
This determination is realized by checking the field flag of the physical row data of the row next to the start row.

If it is determined in step 10 that it is TOP, then in step 11 the temporary buffer processing of TOP is started. If it is the top of logical row data consisting of a single physical row, the first temporary buffer 3 is initialized. If it is the top of the logical row data composed of a plurality of physical rows, the physical row data of the start row is saved to the first temporary buffer 3 after initialization. When it is determined to be MID in the determination in step 10, the MID temporary buffer process is performed in the next step 12, and the physical row data of the start row is saved to the first temporary buffer 3,
When it is determined to be END in the determination in step 10, the next step 13
To enter the temporary buffer processing of END to initialize the first temporary buffer 3.

Thus, Step 11, Step 12, Step 13
Is completed, in step 14, the data in the screen buffer 5 is shifted upward by one line, and in step 15, a blank line is set as the end line of the display screen.
A specific example of the processing of steps 11 to 15 is described in the fifth section.
Shown in the figure. Here, FIG. 5 (A) shows an example of processing for a single physical row in step 11, and FIG.
FIG. 5 (C) shows an example of processing for 11 physical rows.
5 shows an example of processing relating to step 12, and FIG. 5 (D) shows an example of processing relating to step 13. As is clear from this example, by executing the processing of steps 11 to 15, the first temporary buffer 3
, And the physical row data located at the start row form one logical row data.

In step 16 following step 15, the physical row data located in the row immediately before the end row set in the blank row is TOP, MI
Judge which of D and END is applicable. If it is determined in step 16 that the data is TOP, the process proceeds to step 17 in which the end row of TOP is entered. If physical row data is set in the second temporary buffer 4, the data is terminated. Set to screen buffer 5 to display on line. When it is determined in step 16 that the MID is the MID, the process goes to the end line processing of the MID in the next step 18 so that the physical line data set in the second temporary buffer 4 is displayed on the end line. Set to screen buffer 5. Then, when it is determined to be END in the determination of step 16, the end line processing of END is entered in the next step 19, the logical line data of the next line number of the original data 1 is searched, and the number of ANK characters is checked. If the logical line data obtained by the search falls within one physical line, it is set in the screen buffer 5 so that it can be immediately displayed on the end line. The screen buffer 5 is set to be displayed at the end line, and the rest is set to the second temporary buffer 4 line by line. When the physical row data is not set in the second temporary buffer 4 in the processing in the step 17, the same processing as the processing in the step 19 is executed.

Finally, in step 20, the cursor is set to the first column position of the end line, and the next upward scroll request is waited. In this way, according to the present invention, upward scrolling can be realized in physical row data units instead of logical row data units.

FIG. 6 is a flowchart of the downward scroll processing of the present invention executed by the scroll executing means 2. Since the scrolling process only changes the data flow,
The processing is basically the same as the processing in the upward scroll processing. However, in the upper scroll processing, the processing is divided into TOP of the logical row data composed of a single physical row and TOP of the logical row data composed of multiple physical rows. But END is different in that this does not happen. FIG. 7 shows a specific example of the processing of steps 21 to 25 in the flowchart of FIG. Here, FIG. 7 (A) shows an example of processing relating to step 21, and FIG.
FIG. 7 (C) shows an example of processing for step 23.
2 shows an example of processing for.

FIG. 8 specifically shows the state of the screen buffer 5 and the first temporary buffer 3 when the upward scroll processing is performed on the display screen shown in FIG. FIG. 8A shows the state of the display screen (screen buffer 5) before scrolling. In this example, since the physical row data located at the start row is the TOP of the logical row data consisting of multiple physical rows,
According to the processing in step 11, as shown in FIG. 8 (B), the physical row data is stored in the first temporary buffer 3.
To be evacuated. Then, by the processing of steps 14 and 15, a blank line is set as the end line as shown in FIG. 8 (C). Subsequently, in this example, since the line preceding the end line is TOP, the next line number 40 is obtained according to the processing in step 17.
(In this example, within one physical line) is set in the screen buffer 5. Thus, the upward scroll is completed as shown in FIG. 8 (D).

Although the embodiment has been described above, the present invention is not limited to this. For example, the number of MIDs is not limited to one, but may be plural.

〔The invention's effect〕

As described above, according to the present invention, even when one logical line is a text corresponding to a plurality of physical lines, scroll processing is performed in units of one physical line. Without deleting and redisplaying the screen with
The display text will no longer indicate an anomaly.

[Brief description of the drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a diagram of a system of the present invention, FIG. 3 is an explanatory diagram for explaining TOP, MID, and END, FIG. FIG. 5 is an explanatory diagram of a processing example of steps 11 to 15, FIG. 6 is a flowchart of a lower scrolling process, FIG. 7 is an explanatory diagram of a processing example of steps 21 to 25, and FIG. FIG. 9 is an explanatory diagram of a problem in the prior art (I). FIG. 10 is an explanatory diagram (II) of a problem in the prior art. In the figure, 1 is the original data, 2 is the scroll execution means, 3 is the first temporary buffer, 4 is the second temporary buffer, 5
Is a screen buffer, 6 is a start line, 7 is an end line, 8 is a line type determining means, 10 is a memory, 20 is a data processing device, 21 is a line management table, 22 is a buffer memory, and 30 is a display device.

Claims (1)

(57) [Claims] 1. A scroll executing means (2) for extracting original data (1) in order with logical row data based on a plurality of physical row data when a scroll request is issued; The first temporary buffer (3) for temporarily storing the logical row data fetched by (2), and the scrolling in the opposite direction to the logical row data sent to the first temporary buffer (3). A second temporary buffer (4) for temporarily storing the logical row data fetched by the executing means (2), and a plurality of plural temporary buffers (3, 4) input via the first and second temporary buffers (3, 4). By providing a screen buffer (5) that stores logical row data and serves as a buffer for display on the display device (30), In the scroll execution method for scrolling the display text displayed in (30), the physical line data located at the start line (6) and the end line (7) of the screen buffer (5) is the head of the logical line data. A line type determining unit (8) for determining whether the line corresponds to a line, an intermediate line, or a last line; and the scroll execution unit (2) performs a determination based on the determination result of the line type determining unit (8). The physical row data information of the logical row data stored in the first and second temporary buffers (3, 4) is changed to the start row (6) and the end row ( 7)
A scroll execution method for the display text, which is performed by scrolling so that it does not overlap with the physical line data located at.