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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "BUTTON 1" | |
132 | .TH BUTTON 1 "2000-12-30" "perl v5.8.0" "User Contributed Perl Documentation" | |
133 | .SH "NAME" | |
134 | Tk::Button \- Create and manipulate Button widgets | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | \&\fI$button\fR = \fI$parent\fR\->\fBButton\fR(?\fIoptions\fR?); | |
138 | .SH "STANDARD OPTIONS" | |
139 | .IX Header "STANDARD OPTIONS" | |
140 | \&\fB\-activebackground\fR \fB\-cursor\fR \fB\-highlightthickness\fR \fB\-takefocus\fR | |
141 | \&\fB\-activeforeground\fR \fB\-disabledforeground\fR \fB\-image\fR \fB\-text\fR | |
142 | \&\fB\-anchor\fR \fB\-font\fR \fB\-justify\fR \fB\-textvariable\fR | |
143 | \&\fB\-background\fR \fB\-foreground\fR \fB\-padx\fR \fB\-underline\fR | |
144 | \&\fB\-bitmap\fR \fB\-highlightbackground\fR \fB\-pady\fR \fB\-wraplength\fR | |
145 | \&\fB\-borderwidth\fR \fB\-highlightcolor\fR \fB\-relief\fR | |
146 | .PP | |
147 | See Tk::options for details of the standard options. | |
148 | .SH "WIDGET-SPECIFIC OPTIONS" | |
149 | .IX Header "WIDGET-SPECIFIC OPTIONS" | |
150 | .IP "Name: \fBcommand\fR" 4 | |
151 | .IX Item "Name: command" | |
152 | .PD 0 | |
153 | .IP "Class: \fBCommand\fR" 4 | |
154 | .IX Item "Class: Command" | |
155 | .IP "Switch: \fB\-command\fR" 4 | |
156 | .IX Item "Switch: -command" | |
157 | .PD | |
158 | Specifies a perl/Tk callback to associate with the button. This command | |
159 | is typically invoked when mouse button 1 is released over the button | |
160 | window. | |
161 | .IP "Name: \fBdefault\fR" 4 | |
162 | .IX Item "Name: default" | |
163 | .PD 0 | |
164 | .IP "Class: \fBDefault\fR" 4 | |
165 | .IX Item "Class: Default" | |
166 | .IP "Switch: \fB\-default\fR" 4 | |
167 | .IX Item "Switch: -default" | |
168 | .PD | |
169 | Specifies one of three states for the default ring: \fBnormal\fR, | |
170 | \&\fBactive\fR, or \fBdisabled\fR. In active state, the button is drawn | |
171 | with the platform specific appearance for a default button. In normal | |
172 | state, the button is drawn with the platform specific appearance for a | |
173 | non-default button, leaving enough space to draw the default button | |
174 | appearance. The normal and active states will result in buttons of | |
175 | the same size. In disabled state, the button is drawn with the | |
176 | non-default button appearance without leaving space for the default | |
177 | appearance. The disabled state may result in a smaller button than | |
178 | the active state. | |
179 | ring. | |
180 | .IP "Name: \fBheight\fR" 4 | |
181 | .IX Item "Name: height" | |
182 | .PD 0 | |
183 | .IP "Class: \fBHeight\fR" 4 | |
184 | .IX Item "Class: Height" | |
185 | .IP "Switch: \fB\-height\fR" 4 | |
186 | .IX Item "Switch: -height" | |
187 | .PD | |
188 | Specifies a desired height for the button. | |
189 | If an image or bitmap is being displayed in the button then the value is in | |
190 | screen units (i.e. any of the forms acceptable to \fBTk_GetPixels\fR); | |
191 | for text it is in lines of text. | |
192 | If this option isn't specified, the button's desired height is computed | |
193 | from the size of the image or bitmap or text being displayed in it. | |
194 | .IP "Name: \fBstate\fR" 4 | |
195 | .IX Item "Name: state" | |
196 | .PD 0 | |
197 | .IP "Class: \fBState\fR" 4 | |
198 | .IX Item "Class: State" | |
199 | .IP "Switch: \fB\-state\fR" 4 | |
200 | .IX Item "Switch: -state" | |
201 | .PD | |
202 | Specifies one of three states for the button: \fBnormal\fR, \fBactive\fR, | |
203 | or \fBdisabled\fR. In normal state the button is displayed using the | |
204 | \&\fBforeground\fR and \fBbackground\fR options. The active state is | |
205 | typically used when the pointer is over the button. In active state | |
206 | the button is displayed using the \fBactiveForeground\fR and | |
207 | \&\fBactiveBackground\fR options. Disabled state means that the button | |
208 | should be insensitive: the default bindings will refuse to activate | |
209 | the widget and will ignore mouse button presses. | |
210 | In this state the \fBdisabledForeground\fR and | |
211 | \&\fBbackground\fR options determine how the button is displayed. | |
212 | .IP "Name: \fBwidth\fR" 4 | |
213 | .IX Item "Name: width" | |
214 | .PD 0 | |
215 | .IP "Class: \fBWidth\fR" 4 | |
216 | .IX Item "Class: Width" | |
217 | .IP "Switch: \fB\-width\fR" 4 | |
218 | .IX Item "Switch: -width" | |
219 | .PD | |
220 | Specifies a desired width for the button. | |
221 | If an image or bitmap is being displayed in the button then the value is in | |
222 | screen units (i.e. any of the forms acceptable to \fBTk_GetPixels\fR); | |
223 | for text it is in characters. | |
224 | If this option isn't specified, the button's desired width is computed | |
225 | from the size of the image or bitmap or text being displayed in it. | |
226 | .SH "DESCRIPTION" | |
227 | .IX Header "DESCRIPTION" | |
228 | The \fBButton\fR method creates a new window (given by the | |
229 | \&\f(CW$widget\fR argument) and makes it into a button widget. | |
230 | Additional | |
231 | options, described above, may be specified on the command line | |
232 | or in the option database | |
233 | to configure aspects of the button such as its colors, font, | |
234 | text, and initial relief. The \fBbutton\fR command returns its | |
235 | \&\f(CW$widget\fR argument. At the time this command is invoked, | |
236 | there must not exist a window named \f(CW$widget\fR, but | |
237 | \&\f(CW$widget\fR's parent must exist. | |
238 | .PP | |
239 | A button is a widget that displays a textual string, bitmap or image. | |
240 | If text is displayed, it must all be in a single font, but it | |
241 | can occupy multiple lines on the screen (if it contains newlines | |
242 | or if wrapping occurs because of the \fB\-wraplength\fR option) and | |
243 | one of the characters may optionally be underlined using the | |
244 | \&\fB\-underline\fR option. | |
245 | It can display itself in either of three different ways, according | |
246 | to | |
247 | the \fB\-state\fR option; | |
248 | it can be made to appear raised, sunken, or flat; | |
249 | and it can be made to flash. When a user invokes the | |
250 | button (by pressing mouse button 1 with the cursor over the | |
251 | button), then the perl/Tk callback specified in the \fB\-command\fR | |
252 | option is invoked. | |
253 | .SH "WIDGET METHODS" | |
254 | .IX Header "WIDGET METHODS" | |
255 | The \fBButton\fR method creates a widget object. | |
256 | This object supports the \fBconfigure\fR and \fBcget\fR methods | |
257 | described in Tk::options which can be used to enquire and | |
258 | modify the options described above. | |
259 | The widget also inherits all the methods provided by the generic | |
260 | Tk::Widget class. | |
261 | .PP | |
262 | The following additional methods are available for button widgets: | |
263 | .IP "\fI$button\fR\->\fBflash\fR" 4 | |
264 | .IX Item "$button->flash" | |
265 | Flash the button. This is accomplished by redisplaying the button | |
266 | several times, alternating between active and normal colors. At | |
267 | the end of the flash the button is left in the same normal/active | |
268 | state as when the command was invoked. | |
269 | This command is ignored if the button's state is \fBdisabled\fR. | |
270 | .IP "\fI$button\fR\->\fBinvoke\fR" 4 | |
271 | .IX Item "$button->invoke" | |
272 | Invoke the callback associated with the buttons | |
273 | \&\fB\-command\fR option, if there is one. | |
274 | The return value is the return value from the callback, or the | |
275 | undefined value if there is no callback associated with the button. | |
276 | This command is ignored if the button's state is \fBdisabled\fR. | |
277 | .SH "DEFAULT BINDINGS" | |
278 | .IX Header "DEFAULT BINDINGS" | |
279 | Tk automatically creates class bindings for buttons that give them | |
280 | default behavior: | |
281 | .IP "[1]" 4 | |
282 | .IX Item "[1]" | |
283 | A button activates whenever the mouse passes over it and deactivates | |
284 | whenever the mouse leaves the button. | |
285 | Under Windows, this binding is only active when mouse button 1 has | |
286 | been pressed over the button. | |
287 | .IP "[2]" 4 | |
288 | .IX Item "[2]" | |
289 | A button's relief is changed to sunken whenever mouse button 1 is | |
290 | pressed over the button, and the relief is restored to its original | |
291 | value when button 1 is later released. | |
292 | .IP "[3]" 4 | |
293 | .IX Item "[3]" | |
294 | If mouse button 1 is pressed over a button and later released over | |
295 | the button, the button is invoked. However, if the mouse is not | |
296 | over the button when button 1 is released, then no invocation occurs. | |
297 | .IP "[4]" 4 | |
298 | .IX Item "[4]" | |
299 | When a button has the input focus, the space key causes the button | |
300 | to be invoked. | |
301 | .Sp | |
302 | If the button's state is \fBdisabled\fR then none of the above | |
303 | actions occur: the button is completely non\-responsive. | |
304 | .Sp | |
305 | The behavior of buttons can be changed by defining new bindings for | |
306 | individual widgets or by redefining the class bindings. | |
307 | .SH "KEYWORDS" | |
308 | .IX Header "KEYWORDS" | |
309 | button, widget |