scrollbar(3tk)

omg bestie 💖 welcome to the scrollbar(3tk) manual page glow-up! this is part 1, and we're keeping every single detail, no cap. let's get into it. ✨

🌸 NAME 🌸

scrollbar — create and manipulate 'scrollbar' scrolling control and indicator widgets 🎀

✨ SYNOPSIS ✨

scrollbar pathName ?options?

💅 STANDARD OPTIONS 💅

okay so these are the standard options, bestie. all of them, periodt:

• -activebackground
• -highlightcolor
• -repeatdelay
• -background
• -highlightthickness
• -repeatinterval
• -borderwidth
• -jump
• -takefocus
• -cursor
• -orient
• -troughcolor
• -highlightbackground
• -relief

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

🎀 WIDGET-SPECIFIC OPTIONS 🎀

-activerelief

Database Name: activeRelief Database Class: ActiveRelief

Specifies the relief to use when displaying the element that is active, if any. Elements other than the active element are always displayed with a raised relief. so like, the active one gets its own vibe, the rest stay raised. 💅

-command

Database Name: command Database Class: Command

Specifies the prefix of a Tcl command to invoke to change the view in the widget associated with the scrollbar. When a user requests a view change by manipulating the scrollbar, a Tcl command is invoked. The actual command consists of this option followed by additional information as described later. This option almost always has a value such as .t xview or .t yview, consisting of the name of a widget and either xview (if the scrollbar is for horizontal scrolling) or yview (for vertical scrolling). All scrollable widgets have xview and yview commands that take exactly the additional arguments appended by the scrollbar as described in SCROLLING COMMANDS below. iykyk 👑

-elementborderwidth

Database Name: elementBorderWidth Database Class: BorderWidth

Specifies the width of borders drawn around the internal elements of the scrollbar (the two arrows and the slider). The value may have any of the forms acceptable to Tk_GetPixels. If this value is the empty string (the default), the value of the -borderwidth option is used in its place. so if you leave it blank, it copies -borderwidth, periodt.

-width

Database Name: width Database Class: Width

Specifies the desired narrow dimension of the scrollbar window, not including 3-D border, if any. For vertical scrollbars this will be the width and for horizontal scrollbars this will be the height. The value may have any of the forms acceptable to Tk_GetPixels. it's giving narrow dimension energy 🦋

🌈 DESCRIPTION 🌈

The scrollbar command creates a new window (given by the pathName argument) and makes it into a scrollbar widget. Additional options, described above, may be specified on the command line or in the option database to configure aspects of the scrollbar such as its colors, orientation, and relief. The scrollbar 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. so no duplicate names, bestie, and your parent window better be there. 💖

A scrollbar is a widget that displays two arrows, one at each end of the scrollbar, and a slider in the middle portion of the scrollbar. It provides information about what is visible in an associated window that displays a document of some sort (such as a file being edited or a drawing). The position and size of the slider indicate which portion of the document is visible in the associated window. For example, if the slider in a vertical scrollbar covers the top third of the area between the two arrows, it means that the associated window displays the top third of its document. lowkey genius, right? 🧚

Scrollbars can be used to adjust the view in the associated window by clicking or dragging with the mouse. See the BINDINGS section below for details. 👀

🦋 ELEMENTS 🦋

A scrollbar displays five elements, which are referred to in the widget commands for the scrollbar:

• arrow1 — The top or left arrow in the scrollbar.
• trough1 — The region between the slider and arrow1.
• slider — The rectangle that indicates what is visible in the associated widget.
• trough2 — The region between the slider and arrow2.
• arrow2 — The bottom or right arrow in the scrollbar.

👑 WIDGET COMMAND 👑

The scrollbar 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 ...?

Option and the args determine the exact behavior of the command. The following commands are possible for scrollbar widgets:

pathName activate ?element?

Marks the element indicated by element as active, which causes it to be displayed as specified by the -activebackground and -activerelief options. The only element values understood by this command are arrow1, slider, or arrow2. If any other value is specified then no element of the scrollbar will be active. If element is not specified, the command returns the name of the element that is currently active, or an empty string if no element is active. so like, you can ask who's active, or set who's active. 💅

pathName cget option

Returns the current value of the configuration option given by option. Option may have any of the values accepted by the scrollbar command. it's giving query energy ✨

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 scrollbar command. so you can peek, or you can change, your choice bestie 🎀

pathName delta deltaX deltaY

Returns a real number indicating the fractional change in the scrollbar setting that corresponds to a given change in slider position. For example, if the scrollbar is horizontal, the result indicates how much the scrollbar setting must change to move the slider deltaX pixels to the right (deltaY is ignored in this case). If the scrollbar is vertical, the result indicates how much the scrollbar setting must change to move the slider deltaY pixels down. The arguments and the result may be zero or negative. math queen behavior 📐✨

pathName fraction x y

Returns a real number between 0 and 1 indicating where the point given by x and y lies in the trough area of the scrollbar. The value 0 corresponds to the top or left of the trough, the value 1 corresponds to the bottom or right, 0.5 corresponds to the middle, and so on. X and y must be pixel coordinates relative to the scrollbar widget. If x and y refer to a point outside the trough, the closest point in the trough is used. so like, where in the trough are you? 0 to 1, no cap. 🌈

pathName get

Returns the scrollbar settings in the form of a list whose elements are the arguments to the most recent set widget command. it's giving receipts of the last set 💖

pathName identify x y

Returns the name of the element under the point given by x and y (such as arrow1), or an empty string if the point does not lie in any element of the scrollbar. X and y must be pixel coordinates relative to the scrollbar widget. who dis? 👀

pathName set first last

This command is invoked by the scrollbar's associated widget to tell the scrollbar about the current view in the widget. The command takes two arguments, each of which is a real fraction between 0 and 1. The fractions describe the range of the document that is visible in the associated widget. For example, if first is 0.2 and last is 0.4, it means that the first part of the document visible in the window is 20% of the way through the document, and the last visible part is 40% of the way through. so 0.2 to 0.4 means you're seeing that slice. periodt. 🍓

🔥 SCROLLING COMMANDS 🔥

When the user interacts with the scrollbar, for example by dragging the slider, the scrollbar notifies the associated widget that it must change its view. The scrollbar makes the notification by evaluating a Tcl command generated from the scrollbar's -command option. The command may take any of the following forms. In each case, prefix is the contents of the -command option, which usually has a form like .t yview. so prefix is the vibe, and the rest is the action. 💅

prefix moveto fraction

Fraction is a real number between 0 and 1. The widget should adjust its view so that the point given by fraction appears at the beginning of the widget. If fraction is 0 it refers to the beginning of the document. 1.0 refers to the end of the document, 0.333 refers to a point one-third of the way through the document, and so on. so 0 = start, 1.0 = end, 0.333 = one-third, you get it. ✨

prefix scroll number pages

The widget should adjust its view by number pages. It is up to the widget to define the meaning of a page; typically it is slightly less than what fits in the window, so that there is a slight overlap between the old and new views. Number is either 1, which means the next page should become visible, or -1, which means that the previous page should become visible. Fractional numbers are rounded away from 0, so scrolling 0.001 pages has the same effect as scrolling 1 page. so 1 = next, -1 = previous, and 0.001 = 1 because rounding away from 0. math is mathing. 🔢

prefix scroll number units

The widget should adjust its view by number units. The units are defined in whatever way makes sense for the widget, such as characters or lines in a text widget. Number is either 1, which means one unit should scroll off the top or left of the window, or -1, which means that one unit should scroll off the bottom or right of the window. Fractional numbers are rounded away from 0, so scrolling 0.001 units has the same effect as scrolling 1 unit. same energy as pages but with units. slay. 💅

🎀 BINDINGS 🎀

Tk is out here automatically creating class bindings for scrollbars so they just do the thing, no setup required. Here's the default behavior, bestie. When vertical and horizontal scrollbars act differently, the horizontal tea is in the parentheses. 🫶

1. Pressing button 1 over arrow1 makes the view in the associated widget shift up (left) by one unit, so the document appears to move down (right) one unit. Hold that button down and the action auto-repeats. 💫
2. Pressing button 1 over trough1 makes the view in the associated widget shift up (left) by one screenful, so the document appears to move down (right) one screenful. Hold the button and yes, auto-repeat. 🔁
3. Pressing button 1 over the slider and dragging makes the view drag right along with the slider. But — if the jump option is true, the view does not drag along with the slider; it only changes when you release the mouse button. 🎯
4. Pressing button 1 over trough2 makes the view in the associated widget shift down (right) by one screenful, so the document appears to move up (left) one screenful. Held down? Auto-repeats. 🔁
5. Pressing button 1 over arrow2 makes the view in the associated widget shift down (right) by one unit, so the document appears to move up (left) one unit. Held down? You already know — auto-repeats. ✨
6. If button 2 is pressed over the trough or the slider, it sets the view to match wherever the mouse is; dragging the mouse with button 2 down makes the view drag with the mouse. If button 2 is pressed over one of the arrows, it behaves exactly like pressing button 1. 🖱️
7. Button 1 with the Control key down is giving shortcut energy: if the mouse is over arrow1 or trough1, the view jumps to the very top (left) of the document; if the mouse is over arrow2 or trough2, the view goes to the very bottom (right) of the document; anywhere else and the button press does literally nothing. 💀
8. In vertical scrollbars, the Up and Down keys act just like mouse clicks over arrow1 and arrow2. In horizontal scrollbars these keys have no effect. ⌨️
9. In vertical scrollbars, Control-Up and Control-Down act just like mouse clicks over trough1 and trough2. In horizontal scrollbars these keys have no effect. ⌨️
10. In horizontal scrollbars, the Up and Down keys act just like mouse clicks over arrow1 and arrow2. In vertical scrollbars these keys have no effect. ⌨️
11. In horizontal scrollbars, Control-Up and Control-Down act just like mouse clicks over trough1 and trough2. In vertical scrollbars these keys have no effect. ⌨️
12. The Prior and Next keys act just like mouse clicks over trough1 and trough2. 🔥
13. The Home key adjusts the view to the top (left edge) of the document. 🏠
14. The End key adjusts the view to the bottom (right edge) of the document. 🏁

---

🌈 EXAMPLE 🌈

Wanna create a window with a scrollable text widget? Say less, here's the whole vibe:

toplevel .tl
text .tl.t -yscrollcommand {.tl.s set}
scrollbar .tl.s -command {.tl.t yview}
grid .tl.t .tl.s -sticky nsew
grid columnconfigure .tl 0 -weight 1
grid rowconfigure .tl 0 -weight 1

Look at that. Text widget, scrollbar, grid doing its thing, weights all set so it actually resizes like a main character. 👑

---

👀 SEE ALSO 👀

• ttk::scrollbar(3tk)

---

🔑 KEYWORDS 🔑

scrollbar, widget

---

and that's a wrap on the whole page, bestie!! 🎀✨ This little masterpiece lives in the Tk manual, version 4.1, filed under scrollbar(3tk) — go forth and scroll responsibly. 💖🦋🌸