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Tk Library Procedures Tk_CreateWindow(3TK)

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NAME

Tk_CreateWindow, Tk_CreateWindowFromPath, Tk_DestroyWindow,

Tk_MakeWindowExist - create or delete window

SYNOPSIS

#include

Tk_Window

Tk_CreateWindow(interp, parent, name, topLevScreen)

Tk_Window

Tk_CreateAnonymousWindow(interp, parent, topLevScreen)

Tk_Window

Tk_CreateWindowFromPath(interp, tkwin, pathName, topLevScreen)

Tk_DestroyWindow(tkwin)

Tk_MakeWindowExist(tkwin)

ARGUMENTS

Tcl_Interp *interp (out) Tcl interpreter to

use for error report-

ing. If no error occurs, then *interp isn't modified.

Tk_Window parent (in) Token for the window

that is to serve as the logical parent of the new window. CONST char *name (in) Name to use for this window. Must be unique among all children of the same parent. CONST char *topLevScreen (in) Has same format as screenName. If NULL, then new window is

created as an inter-

nal window. If non-

NULL, new window is

created as a top-

level window on screen topLevScreen. If topLevScreen is an empty string (``'') then new window is Tk Last change: 4.2 1

Tk Library Procedures Tk_CreateWindow(3TK)

created as top-level

window of parent's screen.

Tk_Window tkwin (in) Token for window.

CONST char *pathName (in) Name of new window, specified as path

name within applica-

tion (e.g. .a.b.c).

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DESCRIPTION

The procedures Tk_CreateWindow, Tk_CreateAnonymousWindow, |

and Tk_CreateWindowFromPath are used to create new windows |

for use in Tk-based applications. Each of the procedures |

returns a token that can be used to manipulate the window in | other calls to the Tk library. If the window couldn't be |

created successfully, then NULL is returned and interp- |

>result is modified to hold an error message. |

Tk supports two different kinds of windows: internal win- |

dows and top-level windows. An internal window is an inte-

rior window of a Tk application, such as a scrollbar or menu

bar or button. A top-level window is one that is created as

a child of a screen's root window, rather than as an inte-

rior window, but which is logically part of some existing

main window. Examples of top-level windows are pop-up menus

and dialog boxes.

New windows may be created by calling Tk_CreateWindow. If

the topLevScreen argument is NULL, then the new window will

be an internal window. If topLevScreen is non-NULL, then

the new window will be a top-level window: topLevScreen

indicates the name of a screen and the new window will be created as a child of the root window of topLevScreen. In

either case Tk will consider the new window to be the logi-

cal child of parent: the new window's path name will

reflect this fact, options may be specified for the new win-

dow under this assumption, and so on. The only difference

is that new X window for a top-level window will not be a

child of parent's X window. For example, a pull-down menu's

parent would be the button-like window used to invoke it,

which would in turn be a child of the menu bar window. A dialog box might have the application's main window as its parent.

Tk_CreateAnonymousWindow differs from Tk_CreateWindow in

that it creates an unnamed window. This window will be manipulable only using C interfaces, and will not be visible

to Tcl scripts. Both interior windows and top-level windows

Tk Last change: 4.2 2

Tk Library Procedures Tk_CreateWindow(3TK)

may be created with Tk_CreateAnonymousWindow.

Tk_CreateWindowFromPath offers an alternate way of specify-

ing new windows. In Tk_CreateWindowFromPath the new window

is specified with a token for any window in the target application (tkwin), plus a path name for the new window.

It produces the same effect as Tk_CreateWindow and allows

both top-level and internal windows to be created, depending

on the value of topLevScreen. In calls to

Tk_CreateWindowFromPath, as in calls to Tk_CreateWindow, the

parent of the new window must exist at the time of the call, but the new window must not already exist.

The window creation procedures don't actually issue the com-

mand to X to create a window. Instead, they create a local data structure associated with the window and defer the creation of the X window. The window will actually be

created by the first call to Tk_MapWindow. Deferred window

creation allows various aspects of the window (such as its

size, background color, etc.) to be modified after its crea-

tion without incurring any overhead in the X server. When the window is finally mapped all of the window attributes can be set while creating the window.

The value returned by a window-creation procedure is not the

X token for the window (it can't be, since X hasn't been asked to create the window yet). Instead, it is a token for Tk's local data structure for the window. Most of the Tk

library procedures take Tk_Window tokens, rather than X

identifiers. The actual X window identifier can be retrieved from the local data structure using the

Tk_WindowId macro; see the manual entry for Tk_WindowId for

details.

Tk_DestroyWindow deletes a window and all the data struc-

tures associated with it, including any event handlers

created with Tk_CreateEventHandler. In addition,

Tk_DestroyWindow will delete any children of tkwin recur-

sively (where children are defined in the Tk sense, consist-

ing of all windows that were created with the given window as parent). If tkwin is an internal window, then event

handlers interested in destroy events are invoked immedi-

ately. If tkwin is a top-level or main window, then the

event handlers will be invoked later, after X has seen the request and returned an event for it. If a window has been created but hasn't been mapped, so no X window exists, it is possible to force the creation of the X

window by calling Tk_MakeWindowExist. This procedure issues

the X commands to instantiate the window given by tkwin. Tk Last change: 4.2 3

Tk Library Procedures Tk_CreateWindow(3TK)

KEYWORDS

create, deferred creation, destroy, display, internal win-

dow, screen, top-level window, window

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes:

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| ATTRIBUTE TYPE | ATTRIBUTE VALUE|

|____________________|__________________|_

| Availability | runtime/tk-8 |

|____________________|__________________|_

| Interface Stability| Uncommitted |

|____________________|_________________|

NOTES Source for Tk is available on http://opensolaris.org. Tk Last change: 4.2 4