projects / OpenSPARC-T2-DV / blame
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| 129 | .\" ======================================================================== | |
| 130 | .\" | |
| 131 | .IX Title "SCALE 1" | |
| 132 | .TH SCALE 1 "2000-12-30" "perl v5.8.0" "User Contributed Perl Documentation" | |
| 133 | .SH "NAME" | |
| 134 | Tk::Scale \- Create and manipulate Scale widgets | |
| 135 | .SH "SYNOPSIS" | |
| 136 | .IX Header "SYNOPSIS" | |
| 137 | \&\fI$scale\fR = \fI$parent\fR\->\fBScale\fR(?\fIoptions\fR?); | |
| 138 | .SH "STANDARD OPTIONS" | |
| 139 | .IX Header "STANDARD OPTIONS" | |
| 140 | \&\fB\-activebackground\fR \fB\-font\fR \fB\-highlightthickness\fR \fB\-repeatinterval\fR | |
| 141 | \&\fB\-background\fR \fB\-foreground\fR \fB\-orient\fR \fB\-takefocus\fR | |
| 142 | \&\fB\-borderwidth\fR \fB\-highlightbackground\fR \fB\-relief\fR \fB\-troughcolor\fR | |
| 143 | \&\fB\-cursor\fR \fB\-highlightcolor\fR \fB\-repeatdelay\fR | |
| 144 | .PP | |
| 145 | See Tk::options for details of the standard options. | |
| 146 | .SH "WIDGET-SPECIFIC OPTIONS" | |
| 147 | .IX Header "WIDGET-SPECIFIC OPTIONS" | |
| 148 | .IP "Name: \fBbigIncrement\fR" 4 | |
| 149 | .IX Item "Name: bigIncrement" | |
| 150 | .PD 0 | |
| 151 | .IP "Class: \fBBigIncrement\fR" 4 | |
| 152 | .IX Item "Class: BigIncrement" | |
| 153 | .IP "Switch: \fB\-bigincrement\fR" 4 | |
| 154 | .IX Item "Switch: -bigincrement" | |
| 155 | .PD | |
| 156 | Some interactions with the scale cause its value to change by | |
| 157 | ``large'' increments; this option specifies the size of the | |
| 158 | large increments. If specified as 0, the large increments default | |
| 159 | to 1/10 the range of the scale. | |
| 160 | .IP "Name: \fBcommand\fR" 4 | |
| 161 | .IX Item "Name: command" | |
| 162 | .PD 0 | |
| 163 | .IP "Class: \fBCommand\fR" 4 | |
| 164 | .IX Item "Class: Command" | |
| 165 | .IP "Switch: \fB\-command\fR" 4 | |
| 166 | .IX Item "Switch: -command" | |
| 167 | .PD | |
| 168 | Specifies the prefix of a perl/Tk callback to invoke whenever the scale's | |
| 169 | value is changed via a method. | |
| 170 | The actual command consists | |
| 171 | of this option followed by a space and a real number indicating the | |
| 172 | new value of the scale. | |
| 173 | .IP "Name: \fBdigits\fR" 4 | |
| 174 | .IX Item "Name: digits" | |
| 175 | .PD 0 | |
| 176 | .IP "Class: \fBDigits\fR" 4 | |
| 177 | .IX Item "Class: Digits" | |
| 178 | .IP "Switch: \fB\-digits\fR" 4 | |
| 179 | .IX Item "Switch: -digits" | |
| 180 | .PD | |
| 181 | An integer specifying how many significant digits should be retained | |
| 182 | when converting the value of the scale to a string. | |
| 183 | If the number is less than or equal to zero, then the scale picks | |
| 184 | the smallest value that guarantees that every possible slider | |
| 185 | position prints as a different string. | |
| 186 | .IP "Name: \fBfrom\fR" 4 | |
| 187 | .IX Item "Name: from" | |
| 188 | .PD 0 | |
| 189 | .IP "Class: \fBFrom\fR" 4 | |
| 190 | .IX Item "Class: From" | |
| 191 | .IP "Switch: \fB\-from\fR" 4 | |
| 192 | .IX Item "Switch: -from" | |
| 193 | .PD | |
| 194 | A real value corresponding to the left or top end of the scale. | |
| 195 | .IP "Name: \fBlabel\fR" 4 | |
| 196 | .IX Item "Name: label" | |
| 197 | .PD 0 | |
| 198 | .IP "Class: \fBLabel\fR" 4 | |
| 199 | .IX Item "Class: Label" | |
| 200 | .IP "Switch: \fB\-label\fR" 4 | |
| 201 | .IX Item "Switch: -label" | |
| 202 | .PD | |
| 203 | A string to display as a label for the scale. For | |
| 204 | vertical scales the label is displayed just to the right of the | |
| 205 | top end of the scale. For horizontal scales the label is displayed | |
| 206 | just above the left end of the scale. If the option is specified | |
| 207 | as an empty string, no label is displayed. | |
| 208 | .IP "Name: \fBlength\fR" 4 | |
| 209 | .IX Item "Name: length" | |
| 210 | .PD 0 | |
| 211 | .IP "Class: \fBLength\fR" 4 | |
| 212 | .IX Item "Class: Length" | |
| 213 | .IP "Switch: \fB\-length\fR" 4 | |
| 214 | .IX Item "Switch: -length" | |
| 215 | .PD | |
| 216 | Specifies the desired long dimension of the scale in screen units | |
| 217 | (i.e. any of the forms acceptable to \fBTk_GetPixels\fR). | |
| 218 | For vertical scales this is the scale's height; for horizontal scales | |
| 219 | it is the scale's width. | |
| 220 | .IP "Name: \fBresolution\fR" 4 | |
| 221 | .IX Item "Name: resolution" | |
| 222 | .PD 0 | |
| 223 | .IP "Class: \fBResolution\fR" 4 | |
| 224 | .IX Item "Class: Resolution" | |
| 225 | .IP "Switch: \fB\-resolution\fR" 4 | |
| 226 | .IX Item "Switch: -resolution" | |
| 227 | .PD | |
| 228 | A real value specifying the resolution for the scale. | |
| 229 | If this value is greater than zero then the scale's value will always be | |
| 230 | rounded to an even multiple of this value, as will tick marks and | |
| 231 | the endpoints of the scale. If the value is less than zero then no | |
| 232 | rounding occurs. Defaults to 1 (i.e., the value will be integral). | |
| 233 | .IP "Name: \fBshowValue\fR" 4 | |
| 234 | .IX Item "Name: showValue" | |
| 235 | .PD 0 | |
| 236 | .IP "Class: \fBShowValue\fR" 4 | |
| 237 | .IX Item "Class: ShowValue" | |
| 238 | .IP "Switch: \fB\-showvalue\fR" 4 | |
| 239 | .IX Item "Switch: -showvalue" | |
| 240 | .PD | |
| 241 | Specifies a boolean value indicating whether or not the current | |
| 242 | value of the scale is to be displayed. | |
| 243 | .IP "Name: \fBsliderLength\fR" 4 | |
| 244 | .IX Item "Name: sliderLength" | |
| 245 | .PD 0 | |
| 246 | .IP "Class: \fBSliderLength\fR" 4 | |
| 247 | .IX Item "Class: SliderLength" | |
| 248 | .IP "Switch: \fB\-sliderlength\fR" 4 | |
| 249 | .IX Item "Switch: -sliderlength" | |
| 250 | .PD | |
| 251 | Specfies the size of the slider, measured in screen units along the slider's | |
| 252 | long dimension. The value may be specified in any of the forms acceptable | |
| 253 | to \fBTk_GetPixels\fR. | |
| 254 | .IP "Name: \fBsliderRelief\fR" 4 | |
| 255 | .IX Item "Name: sliderRelief" | |
| 256 | .PD 0 | |
| 257 | .IP "Class: \fBSliderRelief\fR" 4 | |
| 258 | .IX Item "Class: SliderRelief" | |
| 259 | .IP "Switch: \fB\-sliderrelief\fR" 4 | |
| 260 | .IX Item "Switch: -sliderrelief" | |
| 261 | .PD | |
| 262 | Specifies the relief to use when drawing the slider, such as \fBraised\fR | |
| 263 | or \fBsunken\fR. | |
| 264 | .IP "Name: \fBstate\fR" 4 | |
| 265 | .IX Item "Name: state" | |
| 266 | .PD 0 | |
| 267 | .IP "Class: \fBState\fR" 4 | |
| 268 | .IX Item "Class: State" | |
| 269 | .IP "Switch: \fB\-state\fR" 4 | |
| 270 | .IX Item "Switch: -state" | |
| 271 | .PD | |
| 272 | Specifies one of three states for the scale: \fBnormal\fR, | |
| 273 | \&\fBactive\fR, or \fBdisabled\fR. | |
| 274 | If the scale is disabled then the value may not be changed and the scale | |
| 275 | won't activate. | |
| 276 | If the scale is active, the slider is displayed using the color | |
| 277 | specified by the \fBactiveBackground\fR option. | |
| 278 | .IP "Name: \fBtickInterval\fR" 4 | |
| 279 | .IX Item "Name: tickInterval" | |
| 280 | .PD 0 | |
| 281 | .IP "Class: \fBTickInterval\fR" 4 | |
| 282 | .IX Item "Class: TickInterval" | |
| 283 | .IP "Switch: \fB\-tickinterval\fR" 4 | |
| 284 | .IX Item "Switch: -tickinterval" | |
| 285 | .PD | |
| 286 | Must be a real value. | |
| 287 | Determines the spacing between numerical | |
| 288 | tick marks displayed below or to the left of the slider. | |
| 289 | If 0, no tick marks will be displayed. | |
| 290 | .IP "Name: \fBto\fR" 4 | |
| 291 | .IX Item "Name: to" | |
| 292 | .PD 0 | |
| 293 | .IP "Class: \fBTo\fR" 4 | |
| 294 | .IX Item "Class: To" | |
| 295 | .IP "Switch: \fB\-to\fR" 4 | |
| 296 | .IX Item "Switch: -to" | |
| 297 | .PD | |
| 298 | Specifies a real value corresponding | |
| 299 | to the right or bottom end of the scale. | |
| 300 | This value may be either less than or greater than the \fBfrom\fR option. | |
| 301 | .IP "Name: \fBvariable\fR" 4 | |
| 302 | .IX Item "Name: variable" | |
| 303 | .PD 0 | |
| 304 | .IP "Class: \fBVariable\fR" 4 | |
| 305 | .IX Item "Class: Variable" | |
| 306 | .IP "Switch: \fB\-variable\fR" 4 | |
| 307 | .IX Item "Switch: -variable" | |
| 308 | .PD | |
| 309 | Specifies the name of a global variable to link to the scale. Whenever the | |
| 310 | value of the variable changes, the scale will update to reflect this | |
| 311 | value. | |
| 312 | Whenever the scale is manipulated interactively, the variable | |
| 313 | will be modified to reflect the scale's new value. | |
| 314 | .IP "Name: \fBwidth\fR" 4 | |
| 315 | .IX Item "Name: width" | |
| 316 | .PD 0 | |
| 317 | .IP "Class: \fBWidth\fR" 4 | |
| 318 | .IX Item "Class: Width" | |
| 319 | .IP "Switch: \fB\-width\fR" 4 | |
| 320 | .IX Item "Switch: -width" | |
| 321 | .PD | |
| 322 | Specifies the desired narrow dimension of the trough in screen units | |
| 323 | (i.e. any of the forms acceptable to \fBTk_GetPixels\fR). | |
| 324 | For vertical scales this is the trough's width; for horizontal scales | |
| 325 | this is the trough's height. | |
| 326 | .SH "DESCRIPTION" | |
| 327 | .IX Header "DESCRIPTION" | |
| 328 | The \fBScale\fR method creates a new window (given by the | |
| 329 | \&\f(CW$widget\fR argument) and makes it into a scale widget. | |
| 330 | Additional | |
| 331 | options, described above, may be specified on the command line | |
| 332 | or in the option database | |
| 333 | to configure aspects of the scale such as its colors, orientation, | |
| 334 | and relief. The \fBscale\fR command returns its | |
| 335 | \&\f(CW$widget\fR argument. At the time this command is invoked, | |
| 336 | there must not exist a window named \f(CW$widget\fR, but | |
| 337 | \&\f(CW$widget\fR's parent must exist. | |
| 338 | .PP | |
| 339 | A scale is a widget that displays a rectangular \fItrough\fR and a | |
| 340 | small \fIslider\fR. The trough corresponds to a range | |
| 341 | of real values (determined by the \fBfrom\fR, \fBto\fR, and | |
| 342 | \&\fBresolution\fR options), | |
| 343 | and the position of the slider selects a particular real value. | |
| 344 | The slider's position (and hence the scale's value) may be adjusted | |
| 345 | with the mouse or keyboard as described in | |
| 346 | the \*(L"\s-1BINDINGS\s0\*(R" section below. Whenever the scale's value is changed, a Tcl | |
| 347 | command is invoked (using the \fBcommand\fR option) to notify | |
| 348 | other interested widgets of the change. | |
| 349 | In addition, the value | |
| 350 | of the scale can be linked to a Tcl variable (using the \fBvariable\fR | |
| 351 | option), so that changes in either are reflected in the other. | |
| 352 | .PP | |
| 353 | Three annotations may be displayed in a scale widget: a label | |
| 354 | appearing at the top right of the widget (top left for horizontal | |
| 355 | scales), a number displayed just to the left of the slider | |
| 356 | (just above the slider for horizontal scales), and a collection | |
| 357 | of numerical tick marks just to the left of the current value | |
| 358 | (just below the trough for horizontal scales). Each of these three | |
| 359 | annotations may be enabled or disabled using the | |
| 360 | configuration options. | |
| 361 | .SH "WIDGET METHODS" | |
| 362 | .IX Header "WIDGET METHODS" | |
| 363 | The \fBScale\fR method creates a widget object. | |
| 364 | This object supports the \fBconfigure\fR and \fBcget\fR methods | |
| 365 | described in Tk::options which can be used to enquire and | |
| 366 | modify the options described above. | |
| 367 | The widget also inherits all the methods provided by the generic | |
| 368 | Tk::Widget class. | |
| 369 | .PP | |
| 370 | The following additional methods are available for scale widgets: | |
| 371 | .IP "\fI$scale\fR\->\fBcoords\fR(?\fIvalue\fR?)" 4 | |
| 372 | .IX Item "$scale->coords(?value?)" | |
| 373 | Returns a list whose elements are the x and y coordinates of | |
| 374 | the point along the centerline of the trough that corresponds | |
| 375 | to \fIvalue\fR. | |
| 376 | If \fIvalue\fR is omitted then the scale's current value is used. | |
| 377 | .IP "\fI$scale\fR\->\fBget\fR(?\fIx, y\fR?)" 4 | |
| 378 | .IX Item "$scale->get(?x, y?)" | |
| 379 | If \fIx\fR and \fIy\fR are omitted, returns the current value | |
| 380 | of the scale. If \fIx\fR and \fIy\fR are specified, they give | |
| 381 | pixel coordinates within the widget; the command returns | |
| 382 | the scale value corresponding to the given pixel. | |
| 383 | Only one of \fIx\fR or \fIy\fR is used: for horizontal scales | |
| 384 | \&\fIy\fR is ignored, and for vertical scales \fIx\fR is ignored. | |
| 385 | .IP "\fI$scale\fR\->\fBidentify\fR(\fIx, y\fR)" 4 | |
| 386 | .IX Item "$scale->identify(x, y)" | |
| 387 | Returns a string indicating what part of the scale lies under | |
| 388 | the coordinates given by \fIx\fR and \fIy\fR. | |
| 389 | A return value of \fBslider\fR means that the point is over | |
| 390 | the slider; \fBtrough1\fR means that the point is over the | |
| 391 | portion of the slider above or to the left of the slider; | |
| 392 | and \fBtrough2\fR means that the point is over the portion | |
| 393 | of the slider below or to the right of the slider. | |
| 394 | If the point isn't over one of these elements, an empty string | |
| 395 | is returned. | |
| 396 | .IP "\fI$scale\fR\->\fBset\fR(\fIvalue\fR)" 4 | |
| 397 | .IX Item "$scale->set(value)" | |
| 398 | This command is invoked to change the current value of the scale, | |
| 399 | and hence the position at which the slider is displayed. \fIValue\fR | |
| 400 | gives the new value for the scale. | |
| 401 | The command has no effect if the scale is disabled. | |
| 402 | .SH "BINDINGS" | |
| 403 | .IX Header "BINDINGS" | |
| 404 | Tk automatically creates class bindings for scales that give them | |
| 405 | the following default behavior. | |
| 406 | Where the behavior is different for vertical and horizontal scales, | |
| 407 | the horizontal behavior is described in parentheses. | |
| 408 | .IP "[1]" 4 | |
| 409 | .IX Item "[1]" | |
| 410 | If button 1 is pressed in the trough, the scale's value will | |
| 411 | be incremented or decremented by the value of the \fBresolution\fR | |
| 412 | option so that the slider moves in the direction of the cursor. | |
| 413 | If the button is held down, the action auto\-repeats. | |
| 414 | .IP "[2]" 4 | |
| 415 | .IX Item "[2]" | |
| 416 | If button 1 is pressed over the slider, the slider can be dragged | |
| 417 | with the mouse. | |
| 418 | .IP "[3]" 4 | |
| 419 | .IX Item "[3]" | |
| 420 | If button 1 is pressed in the trough with the Control key down, | |
| 421 | the slider moves all the way to the end of its range, in the | |
| 422 | direction towards the mouse cursor. | |
| 423 | .IP "[4]" 4 | |
| 424 | .IX Item "[4]" | |
| 425 | If button 2 is pressed, the scale's value is set to the mouse | |
| 426 | position. If the mouse is dragged with button 2 down, the scale's | |
| 427 | value changes with the drag. | |
| 428 | .IP "[5]" 4 | |
| 429 | .IX Item "[5]" | |
| 430 | The Up and Left keys move the slider up (left) by the value | |
| 431 | of the \fBresolution\fR option. | |
| 432 | .IP "[6]" 4 | |
| 433 | .IX Item "[6]" | |
| 434 | The Down and Right keys move the slider down (right) by the value | |
| 435 | of the \fBresolution\fR option. | |
| 436 | .IP "[7]" 4 | |
| 437 | .IX Item "[7]" | |
| 438 | Control-Up and Control-Left move the slider up (left) by the | |
| 439 | value of the \fBbigIncrement\fR option. | |
| 440 | .IP "[8]" 4 | |
| 441 | .IX Item "[8]" | |
| 442 | Control-Down and Control-Right move the slider down (right) by the | |
| 443 | value of the \fBbigIncrement\fR option. | |
| 444 | .IP "[9]" 4 | |
| 445 | .IX Item "[9]" | |
| 446 | Home moves the slider to the top (left) end of its range. | |
| 447 | .IP "[10]" 4 | |
| 448 | .IX Item "[10]" | |
| 449 | End moves the slider to the bottom (right) end of its range. | |
| 450 | .Sp | |
| 451 | If the scale is disabled using the \fBstate\fR option then | |
| 452 | none of the above bindings have any effect. | |
| 453 | .Sp | |
| 454 | The behavior of scales can be changed by defining new bindings for | |
| 455 | individual widgets or by redefining the class bindings. | |
| 456 | .SH "KEYWORDS" | |
| 457 | .IX Header "KEYWORDS" | |
| 458 | scale, slider, trough, widget |