JP2764788B2 - Display control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control device for displaying display data and a cursor mark for specifying a data input position on the display data on a display screen. . 2. Description of the Related Art FIG. 7 shows a display state when an operator performs kanji input from a keyboard using a personal computer, office computer, or the like, other than a dedicated word processor. "HIJK78" appears on the lower part of the display screen.
The character string "9" is displayed, and the cursor 11 is displayed immediately after that. If you operate the kanji input key in this state,
The kanji conversion guidance screen 10a is displayed. Since the display position of the kanji conversion guidance screen 10a is displayed at the bottom of the display screen, when character data is displayed at the bottom of the display screen and the cursor is displayed as shown in FIG. As shown in FIG. 7B, the cursor position is hidden by the kanji conversion guidance screen 10a, and the latest input data is also hidden. [0003] As described above, in the related art, the latest input data and the cursor position may be hidden by the display of the kanji conversion guidance screen. When inputting data, it is inconvenient to know how much data has been input. SUMMARY OF THE INVENTION It is an object of the present invention to prevent the display position of a cursor on display data from being hidden when displaying a specific display screen, and to make the display data easy to see and the cursor display position on the display data to be easy to see. That is, the display can be performed without impairing the display. According to the present invention, predetermined display data is displayed on a display screen at a predetermined display pitch, and a cursor mark for specifying a data input position on the display data is displayed. Display means, and determination means for determining whether or not a display position of the cursor mark is within the specific display area when an instruction to display a specific display screen in a specific display area is provided, When it is determined by the determination means that the cursor mark is within the specific display area, the cursor mark is displayed so that the display position of the cursor mark is displayed on the display screen at a display position outside the specific display area. And scrolling the display data whose data input position is specified by the cursor mark in a predetermined direction while maintaining the predetermined display pitch. Display control means for controlling display so as not to change the display position of the display data and the display position of the cursor mark on the display screen when it is determined that the display position is not within a specific display area by the determination means; , Are provided. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of a personal computer to which the present embodiment is applied. A CPU 21 for controlling the entire system is provided with a RAM via a common bus 22.
(Random access memory) and ROM (read
A memory 23 (only memory), a key controller 24, a CRT controller 25, and a video RAM 26 are connected. The memory 23 includes a control program, an application program, and various flags such as a flag KFLAG for storing "1" in the kanji conversion mode,
A storage area or the like for saving the cursor position is provided. When data is input from the keyboard 27, the CPU 21 is interrupted via the key controller 24, and the control program stored in the memory 23 is executed. The input data is converted into a predetermined code and stored in the memory 2
3 is stored in the input data storage area. The CRT controller 25 is a control device that converts display data stored in the video RAM 26 into an image signal and displays the image signal on the CRT 28, and has a screen division function. In the CRT controller 25, registers 25a, 25b, 25c, 25
There are four registers d, and the register 25a stores the head address of the display data in the video RAM 26 to be displayed on the upper divided screen. Similarly, the register 25b stores the start address of the display data to be displayed on the lower divided screen. The register 25c stores an address for specifying a screen division position, and the register 25d stores an address for specifying a cursor display position. The CRT controller 25 reads the display data from the video RAM 26 based on the screen display information stored in the registers 25a to 25d, converts the display data into an image signal, and displays the image signal on the CRT 28. The video RAM 26 is a bit-mapped frame memory for storing display information of each dot on the screen, and includes a video RAM 26a for storing one screen of dot data to be displayed on the CRT 28 and a screen for a kanji conversion guidance screen. Video RAM 26 for storing images
b. On the screen 28a of the CRT 28, as shown in FIG. 2 (a), orthogonal-XY coordinates are set in units of columns (columns) having the origin at the upper left end (0,0) and lines (rows). Then, the display position of the screen 28a is designated by (X, Y). Also, as shown in FIG.
An address starting from the origin (0, 0) is set in 8a in the scanning order of the screen. Since the screen 28a is composed of m lines × n columns, when the screen coordinates of the cursor are (X, Y), the cursor address C is mY + x. FIG. 2C shows the relationship between the values of screen information set in the registers 25a to 25d when displaying on the screen 28a, the address of the screen 28a, and the address of the video RAM 26 as shown in FIG. c) ~
(E). As shown in FIG.
Is set to the start address a of the video RAM 26a, and the register 25b is set to the start address b of the video RAM 26b. Also, register 2
The address S of the screen 28a is set in 5c. Note that S = m × (n−2). The cursor address C is set in the register 25d.
In the video RAM 26a, image data of "1, 2, 3,""A, B, C" and "Kanji" are stored in the video RAM 26b as shown in FIG. The image data is stored in FIG.
As shown in (c), the video RAM is located above the divided screen of the screen 28a (screen addresses 0 to S-1).
The image data stored in the screen 26a is displayed below the divided screen of the screen 28a (from the screen address S to the final address). The image data of the kanji conversion guidance screen stored in the video RAM 26b is displayed. Next, the operation of the embodiment configured as described above will be described with reference to the flowchart of FIG.
FIG. 4 is also referred to. FIG. 3 is a flowchart showing the operation of the key controller 2 when the operator performs key operations from the keyboard 27.
4 is a flowchart illustrating an operation when a control program stored in a memory 23 is executed by interrupting the CPU 21 via the CPU 4. When the control program is executed, it is first determined whether or not the operated key is a kanji input key based on the code data input from the key controller 24 (process ST1). If the flag KF
It is determined whether or not LAG is "0" (processing ST
2). If the flag KFLAG is "0", that is, if it is not the kanji input mode, the flag KFLAG is set to "1" (process ST3), and the current cursor position is displayed on the screen 28.
a is determined in the lower two rows (step S
T4). That is, it is determined whether the value of the cursor address C stored in the register 25d satisfies the condition of C ≧ (n−2) × m, and the current cursor position is located in the lower two rows on the screen 28a. If register 25a has a
+ 2m, b is stored in the register 25b, and S is stored in the register 25c (process ST5). After saving the current cursor position C in the cursor position save area in the memory 23, C + 2m is set in the register 25d (process ST).
5). The CRT controller 25 reads out the display data stored in the video RAM 26 based on the values of the registers 25a, 25b, 25c set in the process ST5,
An image signal corresponding to the display data is generated and a CRT 28 is generated.
To be displayed. Then, a kanji conversion process for converting kana input data input from the keyboard 27 into kanji is performed (process ST6). It should be noted that the kanji conversion processing is not a main part of the present invention, and a detailed description thereof will be omitted. Here, the display operation of the CRT 28 in the above-mentioned processes ST1 to ST6 will be described with reference to FIGS. 4 (a) to 4 (c). When the data "4, 5, 6, 8" is input to the lowermost row of the screen 28a in the normal input mode as shown in FIG.
(A), the starting address a of the video RAM 26a is stored in the register 25a.
Stores the start address b of the video RAM 26b and mx (n-1) in the register 25c. The cursor address c stored in the register 25d is m × (n−
2) +5 (see FIG. 4A). Therefore, it is determined in the processing ST4 that the cursor position is in the lower two rows, and the values of "a + 2m", "b", "S", and "C-2m" are set in the registers 25a to 25d in the processing ST5. Therefore, the CR
The screen shown in FIG. 4B is displayed on the screen 28a of T28. As shown in FIG. 4B, on the kanji conversion guidance screen, “kanji conversion” is displayed at the left end of the second line from the bottom.
Is displayed at the left end of the first line from the bottom, and the character "Kana" is displayed, followed by the display of "Kanji conversion", followed by a highlighted display indicating the cursor. That is, when data is input to the display position of the kanji conversion guidance screen and the mode is switched to the kanji input mode, the display on the screen 28a moves upward by two lines in parallel. Will not disappear. In addition, since the screen moves up by two lines in parallel, the cursor position also moves up by two lines. On the other hand, when the value of the cursor address C stored in the register 25d in the process ST4 is C <m × (n−
In the case of 1), the display position of the cursor is the screen 28a.
Therefore, the start address a of the video RAM 26a is set in the register 25a and the start address b of the video RAM 26b is set in the register 25b (process ST7). Further, the address S of the second line from the bottom of the screen 28a is set in the register 25c, and the cursor position C is saved in the cursor position save area (processing S
T7). For example, FIG. 5A shows a screen when the current position of the cursor is not in the lower two rows, that is, when data has not yet been input to the lower two rows. At this time, when the mode is switched to the kanji input mode, the screen is switched to the screen shown in FIG. In FIG. 5B, only the kanji conversion guidance screen is newly displayed without changing the display position of the input data. In step ST2, the flag KFLAG is set.
Is "1", i.e., the kanji input mode, the flag KF
"0" is set to LAG (process ST8), and register 2
The start address a of the video RAM 26a is set to 5a, the start address b of the video RAM 26b is set to the register 25b, and m × n is set to the register 25c (process ST9). The cursor position saved in the cursor position save area is returned to the register 25d (process ST9). CRT
After the next refresh display, the controller 25 reads display data from the video RAM 26a and displays it on the screen 28a of the CRT 28 based on the values of the registers 25a to 25d set in the process ST9. That is, when the kanji input key is pressed in the kanji input mode shown in FIGS. 4 (b) and 5 (b),
(C), the mode is switched to the normal input mode as shown in FIG. 5 (c). On the other hand, if a key other than the kanji input key is operated in the process ST1, a process is performed when another key is input (process ST10). Since the process ST10 is not a main part of the present invention, a detailed description is omitted. According to the present invention, when an instruction to display a specific display screen is issued, the display position of the cursor mark is in a specific display area overlapping the display of the specific display screen. It is determined whether or not the cursor mark and the display data whose data input position is specified by the cursor mark are maintained at their original display pitch if they are within the specific display area. Is automatically scrolled in a predetermined direction, so that the display data itself is easy to see even after the specific display screen is displayed, and a cursor mark for specifying a data input position on the display data. The cursor mark can be always displayed on the display screen without deteriorating the visibility of the display position of.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system configuration diagram of an embodiment. FIG. 2 shows the contents of a video RAM and registers 25a to 25.
FIG. 4 is a diagram showing a relationship between a value of d and a display on a screen 28a of the CRT 28. FIG. 3 is a flowchart illustrating the operation of the embodiment. FIG. 4 is a diagram illustrating a display operation of the embodiment. FIG. 5 is a diagram illustrating a display operation of the embodiment. FIG. 6 is a diagram showing the contents of a video RAM and registers 25a to 25d. FIG. 7 is a diagram illustrating a display operation of a conventional screen display device. [Description of Signs] 25 CRT Controller 26a Video RAM Normal Display 26b Video RAM Kanji Conversion 27 Keyboard 28 CRT

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Claims (1)

(57) [Claims] Predetermined display data is displayed on the display screen at a predetermined display pitch.
And display the data on the display data.
Display means for displaying a cursor mark for specifying a force position
And an instruction to display a specific display screen in a specific display area
Is displayed, the display position of the cursor mark is
Discriminating means for discriminating whether or not the constant display region, when it is determined that a specific display area in said discrimination means
Is displayed on the display screen
Is displayed at a display position outside the above specific display area.
The cursor mark and the cursor mark
The above display data whose data input position has been specified
Predetermined location while maintaining a constant display pitch
Control the scroll display in the fixed direction, and
If it is determined that it is not within the display area,
Display position of the display data and the cursor mark
A display control device, comprising: display control means for controlling so as not to change a display position .