Method and system for controlling clipboards in a shared application progam

• US 5,752,254 A
• Filed: 04/08/1996
• Issued: 05/12/1998
• Est. Priority Date: 05/26/1995
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Sakairi, Takashi
• Primary Examiner(s): Feild, Joseph H.
• Assistant Examiner(s): CHEN, JENNIFER
• Application Number:
  US08/630,705
• Time in Patent Office: 764 Days
• Field of Search: 395/330, 395/331, 395/200.07, 395/200.08, 395/200.43, 395/200.62, 395/200.72, 395/200.75, 395/200.31, 395/682, 707/530, 345/330-331
• US Class Current: 715/209
• CPC Class Codes: G06F 9/543 User-generated data transfer, e.g. clipboards, dynamic data exchange [DDE], object linking and embedding [OLE]

Abstract

A group editor has a communication unit, an internal clipboard control unit, a system clipboard control unit, and an internal clipboard. The group editor operates to share the results of input and editing operations among a plurality of computer systems. An operating system clipboard is also provided. The system clipboard and the internal clipboard are linked by the communication unit, internal clipboard control unit, and system clipboard control unit, whereby the user only needs to perform an operation on one clipboard regardless of whether copy and paste between different applications or copy and paste within the same group editor, are performed. Therefore, usability increases, and traffic of the network is decreased.

Claims

1. A group editor which operates to share the results of input and editing operations for a computer network system having a plurality of computer systems, each of the computer systems having an internal clipboard associated with the group editor and a system clipboard associated with the computer systems, the group editor comprising:

means for copying a copy object into said internal clipboard in response to a copy instruction with a specification of said copy object;

means for setting a group editor identifier in said system clipboard, and copying said copy object into said system clipboard in response to said copy instruction;

means for sending a copy message specifying said copy object to said plurality of computer systems in response to said copy instruction;

means responsive to an instruction from the group editor to execute a paste operation specifying a paste destination for determining if a group editor identifier set in the system clipboard identifies the group editor;

means for performing a paste operation from the internal clipboard to said specified paste destination if said group identifier set in the system clipboard identifies the group editor;

means for sending a paste message specifying a paste destination to said other computer systems in response to said means for performing a paste operation;

means for pasting data from said system clipboard if said group identifier set in the system clipboard does not identify the group editor;

means for sending data from said system clipboard to said other computer systems with a specification of a paste destination if said group identifier set in the system clipboard does not identify the group editor;

means for copying into said internal clipboard when said copy message is received from any of said other computer systems; and

means for performing a paste operation from said internal clipboard when said paste message is received from any of said other computer systems.

2. A computer network system as set forth in claim 1 further comprising:

means for setting a flag indicating that said computer system has performed a copy operation in response to said copy instruction;

second checking means for checking if said flag is set when pasting is instructed; and

means for resetting said flag when said copy message is received from any of said other computer systems;

wherein said means for performing a paste operation from the internal clipboard to said specified paste destination is activated if it is determined by said second checking means that said flag is set, and said means for pasting data and said means for sending data with a specification of a paste destination are activated if it is determined that said flag is not set.

3. A plurality of computer systems used in a distributed network system, each of said plurality of computer systems comprising group editor means having an internal clipboard, and operating to share the results of input and editing operations among said plurality of computer systems, each of said plurality of computer systems further comprising an associated system clipboard, said group editor means on each of said plurality of computer systems further comprising:

means for copying a copy object into said internal clipboard in response to a copy instruction with a specification of said copy object;

means for setting an identifier for identifying the group editor means in said system clipboard, and copying said copy object into said system clipboard in response to said copy instruction;

means for sending a copy message specifying said copy object to corresponding group editor means in other said computer systems in response to said copy instruction;

checking means for checking if said identifier set in said system clipboard is equal to the identifier of the group editor means being pasted in response to an instruction of paste operation specifying a paste destination;

paste means for performing a paste operation from the internal clipboard of said group editor means being pasted to said specified paste destination if the result of the check by said checking means is true;

means for sending a paste message specifying a paste destination to corresponding group editor means in said other computer systems in response to said paste means;

means for pasting data from said system clipboard if said check result is not true;

means for sending data from said system clipboard to said other computer systems with a specification of a paste destination if said check result is not true;

means for copying into said internal clipboard when said copy message is received from any of said other computer systems; and

means for performing a paste operation from said internal clipboard when said paste message to the group editor means is received from any of said other computer systems.

4. Computer systems as set forth in claim 3 further comprising:

means for setting a flag indicating that said computer system has performed a copy operation in response to said copy instruction;

second checking means for checking if said flag is set when pasting is instructed; and

means for resetting said flag when said copy message is received from any of said other computer systems;

wherein said paste means for performing a paste operation from the internal clipboard of said group editor means being pasted to said specified paste destination is activated if it is determined by said second checking means that said flag is set, and said means for pasting data and said means for sending data with a specification of a paste destination are activated if it is determined that said flag is not set.

5. In a computer network system having a plurality of computers, each of said plurality of computers comprising group editor means having an internal clipboard, and operating to share the results of input and editing operations among said plurality of computers, each of said plurality of computer systems further comprising an associated system clipboard, a clipboard control method for linking said internal clipboard and said system clipboard, said method comprising the steps of:

copying a copy object into said internal clipboard in response to a copy instruction with a specification of said copy object;

setting an identifier for identifying the group editor means in said system clipboard, and copying said copy object into said system clipboard in response to said copy instruction;

sending a copy message specifying said copy object to corresponding group editor means in other said computer systems in response to said copy instruction;

checking if said identifier set in said system clipboard is equal to the identifier of the group editor means being pasted in response to an instruction of paste operation specifying a paste destination;

performing a paste operation from the internal clipboard of said group editor means being pasted to said specified paste destination if the result of the check by said checking step is true;

sending a paste message specifying a paste destination to the corresponding group editor means in said other computer systems in response to said paste step;

pasting data from said system clipboard if said check result is not true;

sending data from said system clipboard to said other computer systems with a specification of a paste destination if said check result is not true;

copying into said internal clipboard when said copy message is received from any of said computer systems; and

performing a paste operation from said internal clipboard when said paste message to the group editor means is received from any of said other computer systems.

6. A clipboard control method as set forth in claim 5 further comprising the following steps:

setting said flag indicating that said computer system has performed a copy operation in response to said copy instruction;

checking if said flag is set when a paste is instructed; and

resetting said flag when said copy message is received from any of said other computer system;

wherein

said step of performing a paste operation from the internal clipboard of said group editor means being pasted to said specified paste destination is activated if it is determined by said step of checking if said flag is set that said flag is set, and said step of pasting data and said step of sending data with a specification of a paste destination are activated if it is determined that said flag is not set.

7. A system for for sharing editing information between a shared application program executing on a first computer and an associated shared application program executing on a second computer, the system comprising:

an internal clipboard associated with the shared application program executing on said first computer;

a system clipboard associated with the first computer, said system clipboard being accessible to applications programs executing on said first computer;

means for copying a copy object into the internal clipboard responsive to a copy instruction provided by a user of the shared application program executing on the first computer specifying the copy object;

means for setting a group editor identifier in the system clipboard and for copying the copy object into the system clipboard responsive to the copy instruction;

means for sending a copy message specifying the copy object to the associated shared application program executing on the second computer responsive to said copy instruction;

means for determining if an identifier set in the system clipboard identifies the shared application program executing on the first computer responsive to a paste instruction provided by a user of the shared application program executing on the first computer specifying a paste destination;

means for performing a paste operation from the internal clipboard to the specified paste destination if the identifier set in the system clipboard identifies the shared application program executing on the first computer;

means for sending a paste message specifying a paste destination to the second computer responsive to said means for performing a paste operation;

means for pasting data from the system clipboard if the identifier set in the system clipboard does not identify the shared application program executing on the first computer;

means for sending data from the system clipboard to the associated applications program executing on the second computer with a specification of a paste destination if the identifier set in the system clipboard does not identify the shared application program executing on the first computer;

means for receiving a shared copy instruction specifying a shared copy object from the associated applications program executing on the second computer;

means for copying the specified shared copy object into the internal clipboard responsive to the means for receiving a shared copy instruction;

means for receiving a shared paste instruction from the associated applications program executing on the second computer; and

means for performing a paste operation from the internal clipboard responsive to the means for receiving a shared paste instruction.

8. A computer program product for sharing editing information between a shared application program executing on a first computer and having an associated internal clipboard and an associated shared application program executing on a second, the first computer having an associated system clipboard, the computer program product comprising:

a computer-readable storage medium having computer-readable program code means embodied in said medium, said computer-readable program code means comprising;

computer-readable program code means for copying a copy object into the internal clipboard responsive to a copy instruction provided by a user of the shared application program executing on the first computer specifying the copy object;

computer-readable program code means for setting a group editor identifier in the system clipboard and for copying the copy object into the system clipboard responsive to the copy instruction;

computer-readable program code means for sending a copy message specifying the copy object to the associated shared application program executing on the second computer responsive to said copy instruction;

computer-readable program code means for determining if an identifier set in the system clipboard identifies the shared application program executing on the first computer responsive to a paste instruction provided by a user of the shared application program executing on the first computer specifying a paste destination;

computer-readable program code means for performing a paste operation from the internal clipboard to the specified paste destination if the identifier set in the system clipboard identifies the shared application program executing on the first computer;

computer-readable program code means for sending a paste message specifying a paste destination to the second computer responsive to said computer-readable program code means for performing a paste operation;

computer-readable program code means for pasting data from the system clipboard if the identifier set in the system clipboard does not identify the shared application program executing on the first computer;

computer-readable program code means for sending data from the system clipboard to the associated applications program executing on the second computer with a specification of a paste destination if the identifier set in the system clipboard does not identify the shared application program executing on the first computer;

computer-readable program code means for receiving a shared copy instruction specifying a shared copy object from the associated applications program executing on the second computer;

computer-readable program code means for copying the specified shared copy object into the internal clipboard responsive to the computer-readable program code means for receiving a shared copy instruction;

computer-readable program code means for receiving a shared paste instruction from the associated applications program executing on the second computer; and

computer-readable program code means for performing a paste operation from the internal clipboard responsive to the computer-readable program code means for receiving a shared paste instruction.