495 lines
17 KiB
Plaintext
495 lines
17 KiB
Plaintext
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.tr ~
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.SA 0
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.TL
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X11 INPUT SYNTHESIS EXTENSION PROPOSAL
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.AF "Hewlett Packard"
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.ds ZZ Corvallis~Workstation~Operation
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.AU "Larry Woestman" "" ZZ
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.AT "Member of Technical Staff"
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.AS
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This is a proposal for an extension to the X11 server and Xlib.
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It provides two capabilities:
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.BL
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.LI
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It allows a client to generate user input actions in the server without
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requiring a user to be present.
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.LI
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It also allows a client to control the
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handling of user input actions by the server.
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.LE
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.P
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The capability
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to allow a client to generate user input actions in the server
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will be used by some of the X Testing Consortium Xlib tests.
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Both capabilities will be used by the X Testing Consortium client exerciser
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program.
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These capabilities may also be useful in other programs.
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.P
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This extension requires modification to device-dependent code in the
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server. Therefore it is not a `portable' extension as defined by the
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X11 Server Extensions document. However, the majority of the code
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and functionality of this extension will be implementation-independent.
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.AE
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.MT 4
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.nr Cl 4
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.PH "'X11 Input Synthesis Extension Proposal''Page \\\\nP'"
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.PF "''\\\\*(DT''"
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.SK 1
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.H 1 Conventions~Used~In~This~Document
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The naming conventions used in the Xlib documentation are followed
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with these additions:
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.BL
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.LI
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The names of all functions defined in this extension begin with `XTest',
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with the first letter of each additional word capitalized.
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.LI
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The names of the protocol request structures follow the Xlib convention
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of `x<name>Req'.
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.LI
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The names of the protocol request minor type codes follow the Xlib convention
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of `X_<name>'.
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.LI
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The names of all other constants defined in this extension begin with `XTest',
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with the rest of the name in upper case letters.
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.LI
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All constants and structures defined in this extension will have their
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values specified in the `xtestext1.h' file (listed in section 5).
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.LE
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.H 1 Definition~Of~Terms
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.H 2 Input~Actions
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Input actions are pointer movements, button presses and releases,
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and key presses and releases. They can be generated by a user or by a client
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(using functions in this extension).
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.H 2 User~Input~Actions
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User input actions are input actions that are generated by the user
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moving a pointing device (typically a mouse), pressing and releasing buttons on
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the pointing device, and pressing and releasing keys on the keyboard.
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.SK
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.H 1 What~Does~This~Extension~Do?
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Without this extension, user input actions are processed by the server,
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and are converted into normal X events that are sent to the
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appropriate client or clients.
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.P
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This extension adds the following capabilities:
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.BL
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.LI
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Input actions may be sent from a client to the server to be
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processed just as if the user had physically performed them.
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The input actions are provided to the server in the form of X protocol
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requests defined by this extension.
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The information provided to the server includes what action should be
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performed, and how long to delay before processing the action in the server.
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.LI
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User input actions may be diverted to a client before being processed by the
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server.
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The effect on the server is as if the user had performed no input action.
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The user input actions are provided to the client in the form of X events
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defined by this extension.
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The information provided to the client includes what user input action
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occurred and the delay between this user input action and the previous user
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input action.
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The client may then do anything it wishes with this information.
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.LI
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User input actions may be copied, with one copy going to the server in the
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normal way, and the other copy being sent to a client as described above.
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.LE
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.SK
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.H 1 Functions~In~This~Extension
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.H 2 High~Level~Functions
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These functions are built on top of the low level functions described later.
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.H 3 XTestMovePointer
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.DS
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int
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XTestMovePointer(\fIdisplay\fR, \fIdevice_id\fR, \fIdelay\fR, \fIx\fR, \fIy\fR, \fIcount\fR)
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Display \(**\fIdisplay\fR;
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int \fIdevice_id\fR;
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unsigned long \fIdelay\fR[];
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int \fIx\fR[];
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int \fIy\fR[];
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unsigned int \fIcount\fR;
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.DE
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.VL 11 "" 1
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.LI ~
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.LI \fIdisplay\fR
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Specifies the connection to the X server.
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.LI ~
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.LI \fIdevice_id\fR
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Specifies which pointer device was supposed to have caused the input action.
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This is a provision for future support of multiple (distinguishable) pointer
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devices, and should always be set to 0 for now.
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.LI ~
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.LI \fIdelay\fR
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Specifies the time (in milliseconds) to wait before each movement
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of the pointer.
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.LI ~
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.LI \fIx\fR
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.LI \fIy\fR
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Specifies the x and y coordinates to move the pointer to relative to the
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root window for the specified display.
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.LI ~
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.LI \fIcount\fR
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Specifies the number of `delay, x, y' triplets contained in the \fIdelay\fR,
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\fIx\fR and \fIy\fR arrays.
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.LE
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.P
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The
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.I XTestMovePointer
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function creates input actions to be sent to the the server.
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The input actions will be accumulated in a request defined by this extension
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until the request is full or the XTestFlush function is called.
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They will then be sent to the server.
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When the input actions are sent to the server, the input actions will cause
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the server to think that the pointer was moved to the specified position(s),
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with the specified delay before each input action.
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.P
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The
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.I XTestMovePointer
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function will return -1 if there is an error, and 0 otherwise.
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.SK
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.H 3 XTestPressButton
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.DS
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int
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XTestPressButton(\fIdisplay\fR, \fIdevice_id\fR, \fIdelay\fR, \fIbutton_number\fR,
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\fIbutton_action\fR)
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Display \(**\fIdisplay\fR;
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int \fIdevice_id\fR;
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unsigned long \fIdelay\fR;
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unsigned int \fIbutton_number\fR;
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unsigned int \fIbutton_action\fR;
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.DE
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.VL 15
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.LI \fIdisplay\fR
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Specifies the connection to the X server.
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.LI \fIdevice_id\fR
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Specifies which button device was supposed to have caused the input action.
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This is a provision for future support of multiple (distinguishable) button
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devices, and should always be set to 0 for now.
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.LI \fIdelay\fR
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Specifies the time (in milliseconds) to wait before the input action.
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.LI \fIbutton_number\fR
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Specifies which button is being acted upon.
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.LI \fIbutton_action\fR
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Specifies the action to be performed (one of
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\fIXTestPRESS\fR, \fIXTestRELEASE\fR, or \fIXTestSTROKE\fR).
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.LE
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.P
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The
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.I XTestPressButton
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function creates input actions to be sent to the the server.
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The input actions will be accumulated in a request defined by this extension
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until the request is full or the XTestFlush function is called.
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They will then be sent to the server.
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When the input actions are sent to the server, the input actions will cause
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the server to think that the specified button was moved as specified.
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.P
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The
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.I XTestPressButton
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function will return -1 if there is an error, and 0 otherwise.
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.SK
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.H 3 XTestPressKey
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.DS
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int
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XTestPressKey(\fIdisplay\fR, \fIdevice_id\fR, \fIdelay\fR, \fIkeycode\fR, \fIkey_action\fR)
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Display \(**\fIdisplay\fR;
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int \fIdevice_id\fR;
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unsigned long \fIdelay\fR;
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unsigned int \fIkeycode\fR;
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unsigned int \fIkey_action\fR;
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.DE
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.VL 12
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.LI \fIdisplay\fR
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Specifies the connection to the X server.
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.LI \fIdevice_id\fR
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Specifies which keyboard device was supposed to have caused the input action.
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This is a provision for future support of multiple (distinguishable) keyboard
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devices, and should always be set to 0 for now.
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.LI \fIdelay\fR
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Specifies the time (in milliseconds) to wait before the input action.
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.LI \fIkeycode\fR
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Specifies which keycode is being acted upon.
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.LI \fIkey_action\fR
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Specifies the action to be performed (one of
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\fIXTestPRESS\fR, \fIXTestRELEASE\fR, or \fIXTestSTROKE\fR).
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.LE
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.P
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The
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.I XTestPressKey
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function creates input actions to be sent to the the server.
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The input actions will be accumulated in a request defined by this extension
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until the request is full or the XTestFlush function is called.
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They will then be sent to the server.
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When the input actions are sent to the server, the input actions will cause
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the server to think that the specified key on the keyboard was moved as
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specified.
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.P
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The
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.I XTestPressKey
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function will return -1 if there is an error, and 0 otherwise.
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.SK
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.H 3 XTestFlush
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.DS
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int
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XTestFlush(\fIdisplay\fR)
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Display \(**\fIdisplay\fR;
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.DE
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.VL 9
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.LI \fIdisplay\fR
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Specifies the connection to the X server.
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.LE
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.P
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The
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.I XTestFlush
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will send any remaining input actions to the server.
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.P
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The
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.I XTestFlush
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function will return -1 if there is an error, and 0 otherwise.
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.SK
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.H 2 Low~Level~Functions
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.H 3 XTestGetInput
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.DS
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int
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XTestGetInput(\fIdisplay\fR, \fIaction_handling\fR)
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Display \(**\fIdisplay\fR;
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int \fIaction_handling\fR;
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.DE
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.VL 17
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.LI \fIdisplay\fR
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Specifies the connection to the X server.
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.LI \fIaction_handling\fR
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Specifies to the server what to do with the user input actions. (one of
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0, \fIXTestPACKED_MOTION\fR or \fIXTestPACKED_ACTIONS\fR; optionally `or'ed
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with \fIXTestEXCLUSIVE\fR).
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.LE
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.P
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The
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.I XTestGetInput
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function tells the server to begin putting information about user input actions
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into events to be sent to the client that called this function. These events
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can be read via the Xlib \fIXNextEvent\fR function.
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.P
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The server assigns an event type of \fIXTestInputActionType\fR to these events
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to distinguish them from other events.
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Since the actual value of the event type may vary depending on how many
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extensions are included with an X11 implementation,
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\fIXTestInputActionType\fR is a variable that will be contained in the Xlib
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part of this extension. It may be referenced as follows:
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.DS
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extern int XTestInputActionType;
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.DE
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.P
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An \fIaction_handling\fR value of 0 causes the server
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to send one user input action in each \fIXTestInputActionType\fR event.
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This can sometimes cause performance problems.
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.P
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An \fIaction_handling\fR value of \fIXTestPACKED_ACTIONS\fR causes the server
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to pack as many user input actions as possible into a
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\fIXTestInputActionType\fR event.
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This is needed if user input actions are happening rapidly (such as
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when the user moves the pointer) to keep performance at a reasonable level.
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.P
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An \fIaction_handling\fR value of \fIXTestPACKED_MOTION\fR causes the server
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to pack only user input actions associated with moving the pointer.
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This allows the
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client to receive button and key motions as they happen without waiting for the
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event to fill up, while still keeping performance at a reasonable level.
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.P
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An \fIaction_handling\fR value with \fIXTestEXCLUSIVE\fR `or'ed in
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causes the server to send user input actions only to the client.
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The effect on the server is as if the user had performed no input actions.
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.P
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An \fIaction_handling\fR value without \fIXTestEXCLUSIVE\fR
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causes the server to copy user input actions, sending one copy to the
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client, and handling the other copy normally (as it would if this extension
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were not installed).
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.P
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There are four types of input actions that are passed from the server
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to the client. They are:
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.VL 25
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.LI key/button~state~change
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This type of input action contains the keycode of the key or button that
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changed state;
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whether the key or button is up or down,
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and the time delay between this input action and the previous input action.
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.LI pointer~motions
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This type of input action contains information about the motion of the
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pointer when the pointer has only moved a short distance.
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If the pointer has moved a long distance,
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the pointer jump input action is used.
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.LI pointer~jumps
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This type of input action contains information about the motion of the
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pointer when the pointer has moved a long distance.
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.LI delays
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This type of input action is used when the delay between input actions is too
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large to be held in the other input actions.
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.LE
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.P
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The
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.I XTestGetInput
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function will return -1 if there is an error, and 0 otherwise.
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.P
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An error code of \fIBadAccess\fR means that another client has already
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requested that user input actions be sent to it.
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.SK
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.H 3 XTestStopInput
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.DS
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int
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XTestStopInput(\fIdisplay\fR)
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Display \(**\fIdisplay\fR;
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.DE
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.VL 9
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.LI \fIdisplay\fR
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Specifies the connection to the X server.
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.LE
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.P
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The
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.I XTestStopInput
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function tells the server to stop putting information about user input actions
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into events.
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The server will process user input actions normally (as it would
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if this extension were not in the server).
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.P
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The
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.I XTestStopInput
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function will return -1 if there is an error, and 0 otherwise.
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.P
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An error code of \fIBadAccess\fR means that a request was made to stop input
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when input has never been started.
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.SK
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||
|
|
.H 3 XTestFakeInput
|
||
|
|
.DS
|
||
|
|
int
|
||
|
|
XTestFakeInput(\fIdisplay\fR, \fIaction_list_addr\fR, \fIaction_list_size\fR,
|
||
|
|
\fIack_flag\fR)
|
||
|
|
Display \(**\fIdisplay\fR;
|
||
|
|
char \(**\fIaction_list_addr\fR;
|
||
|
|
int \fIaction_list_size\fR;
|
||
|
|
int \fIack_flag\fR;
|
||
|
|
.DE
|
||
|
|
.VL 18
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||
|
|
.LI \fIdisplay\fR
|
||
|
|
Specifies the connection to the X server.
|
||
|
|
.LI \fIaction_list_addr\fR
|
||
|
|
Specifies the address of an list of input actions to be sent to the server.
|
||
|
|
.LI \fIaction_list_size\fR
|
||
|
|
Specifies the size (in bytes) of the list of input actions.
|
||
|
|
It may be no larger than \fIXTestMAX_ACTION_LIST_SIZE\fR bytes.
|
||
|
|
.LI \fIack_flag\fR
|
||
|
|
Specifies whether the server needs to send an event to indicate that its
|
||
|
|
input action buffer is empty (one of
|
||
|
|
\fIXTestFAKE_ACK_NOT_NEEDED\fR or \fIXTestFAKE_ACK_REQUEST\fR).
|
||
|
|
.LE
|
||
|
|
.P
|
||
|
|
The
|
||
|
|
.I XTestFakeInput
|
||
|
|
function tells the server to take the specified user input actions and process
|
||
|
|
them as if the user had physically performed them.
|
||
|
|
.P
|
||
|
|
The server can only accept a limited number of input actions at one
|
||
|
|
time. This limit can be determined by the \fIXTestQueryInputSize\fR function
|
||
|
|
in this extension.
|
||
|
|
.P
|
||
|
|
The client should set \fIack_flag\fR to \fIXTestFAKE_ACK_NOT_NEEDED\fR
|
||
|
|
on calls to \fIXTestFakeInput\fR that do not reach this limit.
|
||
|
|
.P
|
||
|
|
The client should set \fIack_flag\fR to \fIXTestFAKE_ACK_REQUEST\fR
|
||
|
|
on the call to \fIXTestFakeInput\fR that reaches this limit.
|
||
|
|
.P
|
||
|
|
When the server sees an \fIack_flag\fR value of \fIXTestFAKE_ACK_REQUEST\fR
|
||
|
|
it finishes processing its input action buffer, then sends an event with
|
||
|
|
type \fIXTestFakeAckType\fR to the client.
|
||
|
|
When the client reads this event, it knows that it is safe to resume
|
||
|
|
sending input actions to the server.
|
||
|
|
.P
|
||
|
|
Since the actual value of the event type may vary depending on how many
|
||
|
|
extensions are included with an X11 implementation,
|
||
|
|
\fIXTestFakeAckType\fR is a variable that is contained in the Xlib part of
|
||
|
|
this extension. It may be referenced as follows:
|
||
|
|
.DS
|
||
|
|
extern int XTestFakeAckType;
|
||
|
|
.DE
|
||
|
|
.P
|
||
|
|
There are four types of input actions that are passed from the client
|
||
|
|
to the server. They are:
|
||
|
|
.VL 25
|
||
|
|
.LI key/button~state~change
|
||
|
|
This type of input action contains the keycode of the key or button that
|
||
|
|
is to change state;
|
||
|
|
whether the key or button is to be up or down,
|
||
|
|
and the time to delay before changing the state of the key or button.
|
||
|
|
.LI pointer~motions
|
||
|
|
This type of input action contains information about the motion of the
|
||
|
|
pointer when the pointer is to be moved a short distance,
|
||
|
|
and the time to delay before moving the pointer.
|
||
|
|
If the pointer is to be moved a long distance,
|
||
|
|
the pointer jump input action must be used.
|
||
|
|
.LI pointer~jumps
|
||
|
|
This type of input action contains information about the motion of the
|
||
|
|
pointer when the pointer is to be moved a long distance,
|
||
|
|
and the time to delay before moving the pointer.
|
||
|
|
.LI delays
|
||
|
|
This type of input action is used when the delay between input actions is too
|
||
|
|
large to be held in the other input actions.
|
||
|
|
.LE
|
||
|
|
.P
|
||
|
|
The
|
||
|
|
.I XTestFakeInput
|
||
|
|
function will return -1 if there is an error, and 0 otherwise.
|
||
|
|
.P
|
||
|
|
An error code of \fIBadAccess\fR means that another client has already
|
||
|
|
sent user input actions to the server, and the server has not finished
|
||
|
|
processing the user input actions.
|
||
|
|
.SK
|
||
|
|
.H 3 XTestQueryInputSize
|
||
|
|
.DS
|
||
|
|
int
|
||
|
|
XTestQueryInputSize(\fIdisplay\fR, \fIsize_return\fR)
|
||
|
|
Display \(**\fIdisplay\fR;
|
||
|
|
unsigned long \(**\fIsize_return\fR;
|
||
|
|
.DE
|
||
|
|
.VL 13
|
||
|
|
.LI \fIdisplay\fR
|
||
|
|
Specifies the connection to the X server.
|
||
|
|
.LI \fIsize_return\fR
|
||
|
|
Returns the number of input actions that the server's input action buffer can
|
||
|
|
hold.
|
||
|
|
.LE
|
||
|
|
.P
|
||
|
|
The
|
||
|
|
.I XTestQueryInputSize
|
||
|
|
function asks the server to return the number of input actions that it can hold
|
||
|
|
in its input action buffer in the unsigned long pointed to by \fIsize_return\fR.
|
||
|
|
.P
|
||
|
|
The
|
||
|
|
.I XTestQueryInputSize
|
||
|
|
function will return -1 if there is an error, and 0 otherwise.
|
||
|
|
.SK
|
||
|
|
.H 3 XTestReset
|
||
|
|
.DS
|
||
|
|
int
|
||
|
|
XTestReset(\fIdisplay\fR)
|
||
|
|
Display \(**\fIdisplay\fR;
|
||
|
|
.DE
|
||
|
|
.VL 9
|
||
|
|
.LI \fIdisplay\fR
|
||
|
|
Specifies the connection to the X server.
|
||
|
|
.LE
|
||
|
|
.P
|
||
|
|
The
|
||
|
|
.I XTestReset
|
||
|
|
function tells the server to set everything having to do with this extension
|
||
|
|
back to its initial state. After this call the server will act as if this
|
||
|
|
extension were not installed until one of the extension functions is called by
|
||
|
|
a client. This function is not normally needed, but is included in case a
|
||
|
|
client wishes to clean up the server state, such as after a serious error.
|
||
|
|
.P
|
||
|
|
The
|
||
|
|
.I XTestReset
|
||
|
|
function will return -1 if there is an error, and 0 otherwise.
|
||
|
|
.SK
|
||
|
|
.H 1 `xtestext1.h'~File~Listing
|
||
|
|
.DS
|
||
|
|
.so xtestext1.h
|
||
|
|
.DE
|
||
|
|
.TC 1 1 4
|