tabset - create and manipulate tabs as as set

tabset pathName ?options?

itk::Widget <- tabset

background	font	selectBackground	cursor
foreground	selectForeground	disabledForeground	height
width

See the "options" manual entry for details on the standard options.

Name:	angle
Class:	Angle
Command-Line Switch:	-angle

Specifes the angle of slope from the inner edge to the outer edge of the tab. An angle of 0 specifies square tabs. Valid ranges are 0 to 45 degrees inclusive. Default is 15 degrees. If tabPos is e or w, this option is ignored.

Name:	backdrop
Class:	Backdrop
Command-Line Switch:	-backdrop

Specifies a background color to use when filling in the area behind the tabs.

Name:	bevelAmount
Class:	BevelAmount
Command-Line Switch:	-bevelamount

Specifes the size of tab corners. A value of 0 with angle set to 0 results in square tabs. A bevelAmount of 4, means that the tab will be drawn with angled corners that cut in 4 pixels from the edge of the tab. The default is 0.

Name:	command
Class:	Command
Command-Line Switch:	-command
Specifes the prefix of a Tcl command to invoke to change the view in the 
widget associated with the tabset. When a user selects a tab, a Tcl command 
is invoked. The actual command consists of this option followed by a space 
and a number. The number is the numerical index of the tab that has been 
selected.

Name:	equalTabs
Class:	EqualTabs
Command-Line Switch:	-equaltabs


Specifies whether to force tabs to be equal sized or not. A value 
of true means constrain tabs to be equal sized. A value 
of false allows each tab to size based on the text label size. The 
value may have any of the forms accepted by the Tcl_GetBoolean, such 
as true, false, 0, 1, yes, or no.

For horizontally positioned tabs (tabPos is either s 
or n), true forces all tabs to be equal width (the width being 
equal to the longest label plus any padX specified). Horizontal tabs are 
always equal in height. 

For vertically positioned tabs (tabPos is either w or e), 
true forces all tabs to be equal height (the height being equal to 
the height of the label with the largest font). Vertically oriented tabs are 
always equal in width.

Name:	gap
Class:	Gap
Command-Line Switch:	-gap


Specifies the amount of pixel space to place between each tab. Value may 
be any pixel offset value. In addition, a special keyword overlap 
can be used as the value to achieve a standard overlap of tabs. This value 
may have any of the forms acceptable to Tk_GetPixels.

Name:	margin
Class:	Margin
Command-Line Switch:	-margin


Specifies the amount of space to place between the outside edge of the 
tabset and the outside edge of its tabs. If tabPos is s, this 
is the amount of space between the bottom edge of the tabset and the 
bottom edge of the set of tabs. If tabPos is n, this is the 
amount of space between the top edge of the tabset and the top edge of the 
set of tabs. If tabPos is e, this is the amount of space between 
the right edge of the tabset and the right edge of the set of tabs. 
If tabPos is w, this is the amount of space between the left 
edge of the tabset and the left edge of the set of tabs. This value may 
have any of the forms acceptable to Tk_GetPixels.

Name:	padX
Class:	PadX
Command-Line Switch:	-padx


Specifies a non-negative value indicating how much extra space to request for 
a tab around its label in the X-direction. When computing how large a 
window it needs, the tab will add this amount to the width it would normally 
need The tab will end up with extra internal space to the left and right of 
its text label. This value may have any of the forms acceptable 
to Tk_GetPixels.

Name:	padY
Class:	PadY
Command-Line Switch:	-pady


Specifies a non-negative value indicating how much extra space to request 
for a tab around its label in the Y-direction. When computing how large a 
window it needs, the tab will add this amount to the height it would 
normally need The tab will end up with extra internal space to the top and 
bottom of its text label. This value may have any of the forms acceptable 
to Tk_GetPixels.

Name:	raiseSelect
Class:	RaiseSelect
Command-Line Switch:	-raiseselect


Specifes whether to slightly raise the selected tab from the rest of the 
tabs. The selected tab is drawn 2 pixels closer to the outside edge of the 
tabset than the unselected tabs. A value of true says to raise selected 
tabs, a value of false turns this off. The default is false. The value may 
have any of the forms accepted by the Tcl_GetBoolean, such 
as true, false, 0, 1, yes, or no.

Name:	start
Class:	Start
Command-Line Switch:	-start


Specifies the amount of space to place between the left or top edge of the 
tabset and the starting edge of its tabs. For horizontally positioned tabs, 
this is the amount of space between the left edge of the tabset and the left 
edge of the first tab. For vertically positioned tabs, this is the amount 
of space between the top of the tabset and the top of the first tab. This 
value may change if the user performs a MButton-2 scroll on the tabs. This 
value may have any of the forms acceptable to Tk_GetPixels.

Name:	state
Class:	State
Command-Line Switch:	-state


Sets the active state of the tabset. Specifying normal allows all 
tabs to be selectable. Specifying disabled disables the tabset 
causing all tabs to be drawn in the disabledForeground color.

Name:	tabBorders
Class:	TabBorders
Command-Line Switch:	-tabborders


Specifies whether to draw the borders of tabs that are not selected. 
Specifying true (the default) draws these borders, specifying false 
draws only the border around the selected tab. The value may have any 
of the forms accepted by the Tcl_GetBoolean, such 
as true, false, 0, 1, yes, or no.

Name:	tabPos
Class:	TabPos
Command-Line Switch:	-tabpos


Specifies the location of the set of tabs in relation to another widget. Must 
be n, s, e, or w. Defaults to s. North tabs 
open downward, South tabs open upward. West tabs open to the right, east 
tabs open to the left.

The tabset command creates a new window (given by the pathName argument) and makes it into a tabset widget. Additional options, described above may be specified on the command line or in the option database to configure aspects of the tabset such as its colors, font, and text. The tabset command returns its pathName argument. At the time this command is invoked, there must not exist a window named pathName, but pathName's parent must exist.

A tabset is a widget that contains a set of Tab buttons. It displays these tabs in a row or column depending on it tabpos. When a tab is clicked on, it becomes the only tab in the tab set that is selected. All other tabs are deselected. The Tcl command prefix associated with this tab (through the command tab configure option) is invoked with the tab index number appended to its argument list. This allows the tabset to control another widget such as a Notebook.

Tabs are drawn to appear attached to another widget. The tabset draws an edge boundary along one of its edges. This edge is known as the attachment edge. This edge location is dependent on the value of tabPos. For example, if tabPos is s, the attachment edge wil be on the top side of the tabset (in order to attach to the bottom or south side of its attached widget). The selected tab is draw with a 3d relief to appear above the other tabs. This selected tab "opens" toward attachment edge.

Tabs can be controlled in their location along the edges, the angle that tab sides are drawn with, gap between tabs, starting margin of tabs, internal padding around labels in a tab, the font, and its text or bitmap.

The tabset command creates a new Tcl command whose name is pathName. This command may be used to invoke various operations on the widget. It has the following general form: pathName option ?arg arg ...? option and the args determine the exact behavior of the command.

Many of the widget commands for a tabset take as one argument an indicator of which tab of the tabset to operate on. These indicators are called indexes and may be specified in any of the following forms:

number

Specifies the tab numerically, where 0 corresponds to the first tab in the tab set, 1 to the second, and so on.

select

Specifies the currently selected tab's index. If no tab is currently selected, the value -1 is returned.

end

Specifes the last tab in the tabset's index. If the tabset is empty this will return -1.

pattern

If the index doesn't satisfy any of the above forms, then this form is used. Pattern is pattern-matched against the label of each tab in the tabset, in order from the first to the last tab, until a matching entry is found. The rules of Tcl_StringMatch are used.

The following commands are possible for tabset widgets:

pathName add ?option value option value ...?

Add a new tab at the end of the tabset. Returns the child site pathName. If additional arguments are present, they specify any of the following options:

-angle value

Specifes the angle of slope from the inner edge to the outer edge of the tab. An angle of 0 specifies square tabs. Valid ranges are 0 to 45 degrees inclusive. Default is 15 degrees. If this option is specified as an empty string (the default), then the angle option for the overall tabset is used.

-background value

Specifies a background color to use for displaying tabs when they are in their normal state (unselected). If this option is specified as an empty string (the default), then the background option for the overall tabset is used.

-bevelamount value

Specifes the size of tab corners. A value of 0 with angle set to 0 results in square tabs. A bevelAmount of 4, means that the tab will be drawn with angled corners that cut in 4 pixels from the edge of the tab. The default is 0. This is generally only set at the tabset configuration level. Tabs normally will want to share the same bevelAmount.

-bitmap value

If label is a non-empty string, specifies a bitmap to display in the tab. Bitmap may be of any of the forms accepted by Tk_GetBitmap.

-disabledforeground value

Specifies a foreground color to use for displaying tab labels when tabs are in their disable state. If this option is specified as an empty string (the default), then the disabledforeground option for the overall tabset is used.

-font value

Specifies the font to use when drawing the label on a tab. If this option is specified as an empty string then the font option for the overall tabset is used.

-foreground value

Specifies a foreground color to use for displaying tab labels when tabs are in their normal unselected state. If this option is specified as an empty string (the default), then the foreground option for the overall tabset is used.

-image value

If label is a non-empty string, specifies an image to display in the tab. Image must have been created with the image create command. Typically, if the image option is specified then it overrides other options that specify a bitmap or textual value to display in the widget; the image option may be reset to an empty string to re-enable a bitmap or text display.

-label value

Specifies a text string to be placed in the tabs label. If this value is set, the bitmap option is overridden and this option is used instead. This label serves as an additional identifier used to reference the tab. This label may be used for the index value in widget commands.

-selectbackground value

Specifies a background color to use for displaying the selected tab. If this option is specified as an empty string (the default), then the selectBackground option for the overall tabset is used.

-selectforeground value

Specifies a foreground color to use for displaying the selected tab. If this option is specified as an empty string (the default), then the selectForeground option for the overall tabset is used.

-padx value

Specifies a non-negative value indicating how much extra space to request for a tab around its label in the X-direction. When computing how large a window it needs, the tab will add this amount to the width it would normally need The tab will end up with extra internal space to the left and right of its text label. This value may have any of the forms acceptable to Tk_GetPixels. If this option is specified as an empty string (the default), then the padX option for the overall tabset is used

-pady value

Specifies a non-negative value indicating how much extra space to request for a tab around its label in the Y-direction. When computing how large a window it needs, the tab will add this amount to the height it would normally need The tab will end up with extra internal space to the top and bottom of its text label. This value may have any of the forms acceptable to Tk_GetPixels. If this option is specified as an empty string (the default), then the padY option for the overall tabset is used

-state value

Sets the state of the tab. Specifying normal allows this tab to be selectable. Specifying disabled disables the this tab causing its tab label to be drawn in the disabledForeground color. The tab will not respond to events until the state is set back to normal.

pathName configure ?option? ?value option value ...?

Query or modify the configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command returns a list describing the one named option (this list will be identical to the corresponding sublist of the value returned if no option is specified). If one or more option-value pairs are specified, then the command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option may have any of the values accepted by the tabset command.

pathName delete index1 ?index2?

Delete all of the tabs between index1 and index2 inclusive. If index2 is omitted then it defaults to index1. Returns an empty string.

pathName index index

Returns the numerical index corresponding to index.

pathName insert index ?option value option value ...?

Insert a new tab in the tabset before the tab specified by index. The additional arguments are the same as for the add command. Returns the tab's pathName.

pathName next

Advances the selected tab to the next tab (order is determined by insertion order). If the currently selected tab is the last tab in the tabset, the selection wraps around to the first tab. It behaves as if the user selected the next tab.

pathName tabconfigure index ?option? ?value?

This command is similar to the configure command, except that it applies to the options for an individual tab, whereas configure applies to the options for the tabset as a whole. Options may have any of the values accepted by the add widget command. If options are specified, options are modified as indicated in the command and the command returns an empty string. If no options are specified, returns a list describing the current options for tab index (see Tk_ConfigureInfo for information on the format of this list).

pathName prev

Moves the selected tab to the previous tab (order is determined by insertion order). If the currently selected tab is the first tab in the tabset, the selection wraps around to the last tab in the tabset. It behaves as if the user selected the previous tab.

pathName select index

Selects the tab specified by index as the currently selected tab. It behaves as if the user selected the new tab.

Following is an example that creates a tabset with two tabs and a list box that the tabset controls. In addition selecting an item from the list also selects the corresponding tab.

# Define a proc that knows how to select an item 
# from a list given an index from the tabset -command callback.
  proc selectItem { item } {
    .l selection clear [.l curselection]
    .l selection set $item
    .l see $item
}

# Define a proc that knows how to select a tab 
# given a y pixel coordinate from the list..
  proc selectTab { y } {
    set whichItem [.l nearest $y]
    .ts select $whichItem
}

# Create a listbox with two items (one and two) 
# and bind button 1 press to the selectTab procedure.
  listbox .l -selectmode single -exportselection false
  .l insert end one
  .l insert end two
  .l selection set 0
  pack .l
  bind .l <ButtonPress-1> { selectTab %y }

# Create a tabset, set its -command to call selectItem
# Add two labels to the tabset (one and two).
  tabset .ts -command selectItem
  .ts add -label 1
  .ts add -label 2
  .ts select 0
  pack .ts -fill x -expand no

Bill W. Scott

tab tabset notebook tabnotebook