JPH0594165A - Screen redisplaying system - Google Patents

Abstract

PURPOSE:To decrease a display instruction issued to an operating system by using the buffer of a screen, and to shorten the time required for a redisplay. CONSTITUTION:By a main control part 100 for controlling the whole processing, a screen display, a display change, a redisplay, etc., and in the case of the screen display, a flag 110 for showing whether it is written in a buffer 130 or not is turned on, and in the case of the display change, the flag is turned off. In the case of the screen display, a screen control part 120 for controlling the screen display refers to the flag 110 for showing whether it is written in the buffer 130 or not, and when it is turned on, display data is written in the buffer 130 for holding the screen, and the data is displayed on a display device 140 for displaying the screen, irrespective of the flag 110 for showing whether it is mitten in the buffer 130 or not. In the case of the redisplay, the data is read in from the buffer 130 for holding the screen contents, and the data is displayed on the screen of the display device 140.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen redisplay method.

[0002]

2. Description of the Related Art In order to display one screen, it is necessary to issue a plurality of display commands to an operating system, but the conventional screen redisplay method restores a screen once rewritten to the original screen. In order to do so, he had to clear the screen and issue multiple display commands to the operating system again.

[0003]

In the above-mentioned conventional screen redisplay method, in order to restore a screen which has been rewritten to the original screen, it is necessary to redisplay from the beginning, and a plurality of display commands are executed by the operating system. It has the disadvantage that it needs to be issued to the system, which takes time.

[0004]

According to the screen redisplay method of the present invention, a display device for displaying a screen, a buffer for holding a screen to be redisplayed, a flag indicating whether or not to write in the buffer, It has a screen control section for displaying data on the display device by judging whether to write in the buffer by looking at the flag, and a main control section for controlling the whole process including the screen display. ..

[0005]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the screen redisplay method of the present invention. As shown in FIG.
Is a main control unit that controls the entire process, 110 is a flag indicating whether to write in a buffer, 120 is a screen control unit that controls screen display, 130 is a buffer for holding screen contents, 140 is screen contents Display device.

Next, the operation of the screen redisplay method of this embodiment will be described.

FIG. 2 is a flow chart showing an example of the main processing operation of this embodiment. 3 is a flowchart showing an example of the screen display processing operation of this embodiment. Further, FIG. 4 is a flowchart showing an example of the processing operation of redisplaying the screen in this embodiment.

First, as shown in FIG.
Then, the flag 11 indicating whether to write to the buffer 130
0 is turned on, and from step 201 to step 202,
Create the main screen. When the main screen has been created, the flag 110 indicating whether to write in the screen buffer 130 is turned off in step 203.

After that, from step 204 to step 2
At 05, a temporary screen is created. And step 2
At 06, the main screen is displayed again. As shown in FIG. 3, in step 210, if the flag 110 indicating whether to write to the buffer 130 is checked and it is ON, in step 211,
The display data is written to the buffer 130, and the buffer 130
In step 212, a display command is issued to the operating system regardless of the flag 110 indicating whether or not to write.

Further, as shown in FIG. 4, step 22
At 0, a display command is issued to the operating system using the contents of the buffer 130 as display data to redisplay the screen.

[0012]

As described above, in the screen redisplay method of the present invention, by using the buffer, it is not necessary to restart the process from the beginning when redisplaying, and the number of times the display command is issued to the operating system. It also has an effect that the time required for re-display can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a screen display system of the present invention.

FIG. 2 is a flowchart showing an example of a main processing operation of this embodiment.

FIG. 3 is a flowchart showing an example of a screen display processing operation of the present embodiment.

FIG. 4 is a flowchart showing an example of a processing operation of redisplaying a screen in this embodiment.

[Explanation of symbols]

 100 main control unit 110 flag 120 screen control unit 130 buffer 140 display device

Claims (1)

[Claims] 1. A display device for displaying a screen, a buffer for holding a screen to be re-displayed, a flag indicating whether or not to write to the buffer, and a flag for checking whether to write to the buffer based on the flag. A screen redisplay method comprising: a screen control unit that determines and displays data on the display device; and a main control unit that controls the entire process including screen display.