[37] | 1 | # scale.tcl -- |
---|
| 2 | # |
---|
| 3 | # This file defines the default bindings for Tk scale widgets and provides |
---|
| 4 | # procedures that help in implementing the bindings. |
---|
| 5 | # |
---|
| 6 | # RCS: @(#) $Id: scale.tcl,v 1.7 2000/04/14 08:33:31 hobbs Exp $ |
---|
| 7 | # |
---|
| 8 | # Copyright (c) 1994 The Regents of the University of California. |
---|
| 9 | # Copyright (c) 1994-1995 Sun Microsystems, Inc. |
---|
| 10 | # |
---|
| 11 | # See the file "license.terms" for information on usage and redistribution |
---|
| 12 | # of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
---|
| 13 | # |
---|
| 14 | |
---|
| 15 | #------------------------------------------------------------------------- |
---|
| 16 | # The code below creates the default class bindings for entries. |
---|
| 17 | #------------------------------------------------------------------------- |
---|
| 18 | |
---|
| 19 | # Standard Motif bindings: |
---|
| 20 | |
---|
| 21 | bind Scale <Enter> { |
---|
| 22 | if {$tk_strictMotif} { |
---|
| 23 | set tkPriv(activeBg) [%W cget -activebackground] |
---|
| 24 | %W config -activebackground [%W cget -background] |
---|
| 25 | } |
---|
| 26 | tkScaleActivate %W %x %y |
---|
| 27 | } |
---|
| 28 | bind Scale <Motion> { |
---|
| 29 | tkScaleActivate %W %x %y |
---|
| 30 | } |
---|
| 31 | bind Scale <Leave> { |
---|
| 32 | if {$tk_strictMotif} { |
---|
| 33 | %W config -activebackground $tkPriv(activeBg) |
---|
| 34 | } |
---|
| 35 | if {[string equal [%W cget -state] "active"]} { |
---|
| 36 | %W configure -state normal |
---|
| 37 | } |
---|
| 38 | } |
---|
| 39 | bind Scale <1> { |
---|
| 40 | tkScaleButtonDown %W %x %y |
---|
| 41 | } |
---|
| 42 | bind Scale <B1-Motion> { |
---|
| 43 | tkScaleDrag %W %x %y |
---|
| 44 | } |
---|
| 45 | bind Scale <B1-Leave> { } |
---|
| 46 | bind Scale <B1-Enter> { } |
---|
| 47 | bind Scale <ButtonRelease-1> { |
---|
| 48 | tkCancelRepeat |
---|
| 49 | tkScaleEndDrag %W |
---|
| 50 | tkScaleActivate %W %x %y |
---|
| 51 | } |
---|
| 52 | bind Scale <2> { |
---|
| 53 | tkScaleButton2Down %W %x %y |
---|
| 54 | } |
---|
| 55 | bind Scale <B2-Motion> { |
---|
| 56 | tkScaleDrag %W %x %y |
---|
| 57 | } |
---|
| 58 | bind Scale <B2-Leave> { } |
---|
| 59 | bind Scale <B2-Enter> { } |
---|
| 60 | bind Scale <ButtonRelease-2> { |
---|
| 61 | tkCancelRepeat |
---|
| 62 | tkScaleEndDrag %W |
---|
| 63 | tkScaleActivate %W %x %y |
---|
| 64 | } |
---|
| 65 | bind Scale <Control-1> { |
---|
| 66 | tkScaleControlPress %W %x %y |
---|
| 67 | } |
---|
| 68 | bind Scale <Up> { |
---|
| 69 | tkScaleIncrement %W up little noRepeat |
---|
| 70 | } |
---|
| 71 | bind Scale <Down> { |
---|
| 72 | tkScaleIncrement %W down little noRepeat |
---|
| 73 | } |
---|
| 74 | bind Scale <Left> { |
---|
| 75 | tkScaleIncrement %W up little noRepeat |
---|
| 76 | } |
---|
| 77 | bind Scale <Right> { |
---|
| 78 | tkScaleIncrement %W down little noRepeat |
---|
| 79 | } |
---|
| 80 | bind Scale <Control-Up> { |
---|
| 81 | tkScaleIncrement %W up big noRepeat |
---|
| 82 | } |
---|
| 83 | bind Scale <Control-Down> { |
---|
| 84 | tkScaleIncrement %W down big noRepeat |
---|
| 85 | } |
---|
| 86 | bind Scale <Control-Left> { |
---|
| 87 | tkScaleIncrement %W up big noRepeat |
---|
| 88 | } |
---|
| 89 | bind Scale <Control-Right> { |
---|
| 90 | tkScaleIncrement %W down big noRepeat |
---|
| 91 | } |
---|
| 92 | bind Scale <Home> { |
---|
| 93 | %W set [%W cget -from] |
---|
| 94 | } |
---|
| 95 | bind Scale <End> { |
---|
| 96 | %W set [%W cget -to] |
---|
| 97 | } |
---|
| 98 | |
---|
| 99 | # tkScaleActivate -- |
---|
| 100 | # This procedure is invoked to check a given x-y position in the |
---|
| 101 | # scale and activate the slider if the x-y position falls within |
---|
| 102 | # the slider. |
---|
| 103 | # |
---|
| 104 | # Arguments: |
---|
| 105 | # w - The scale widget. |
---|
| 106 | # x, y - Mouse coordinates. |
---|
| 107 | |
---|
| 108 | proc tkScaleActivate {w x y} { |
---|
| 109 | if {[string equal [$w cget -state] "disabled"]} { |
---|
| 110 | return |
---|
| 111 | } |
---|
| 112 | if {[string equal [$w identify $x $y] "slider"]} { |
---|
| 113 | set state active |
---|
| 114 | } else { |
---|
| 115 | set state normal |
---|
| 116 | } |
---|
| 117 | if {[string compare [$w cget -state] $state]} { |
---|
| 118 | $w configure -state $state |
---|
| 119 | } |
---|
| 120 | } |
---|
| 121 | |
---|
| 122 | # tkScaleButtonDown -- |
---|
| 123 | # This procedure is invoked when a button is pressed in a scale. It |
---|
| 124 | # takes different actions depending on where the button was pressed. |
---|
| 125 | # |
---|
| 126 | # Arguments: |
---|
| 127 | # w - The scale widget. |
---|
| 128 | # x, y - Mouse coordinates of button press. |
---|
| 129 | |
---|
| 130 | proc tkScaleButtonDown {w x y} { |
---|
| 131 | global tkPriv |
---|
| 132 | set tkPriv(dragging) 0 |
---|
| 133 | set el [$w identify $x $y] |
---|
| 134 | if {[string equal $el "trough1"]} { |
---|
| 135 | tkScaleIncrement $w up little initial |
---|
| 136 | } elseif {[string equal $el "trough2"]} { |
---|
| 137 | tkScaleIncrement $w down little initial |
---|
| 138 | } elseif {[string equal $el "slider"]} { |
---|
| 139 | set tkPriv(dragging) 1 |
---|
| 140 | set tkPriv(initValue) [$w get] |
---|
| 141 | set coords [$w coords] |
---|
| 142 | set tkPriv(deltaX) [expr {$x - [lindex $coords 0]}] |
---|
| 143 | set tkPriv(deltaY) [expr {$y - [lindex $coords 1]}] |
---|
| 144 | $w configure -sliderrelief sunken |
---|
| 145 | } |
---|
| 146 | } |
---|
| 147 | |
---|
| 148 | # tkScaleDrag -- |
---|
| 149 | # This procedure is called when the mouse is dragged with |
---|
| 150 | # mouse button 1 down. If the drag started inside the slider |
---|
| 151 | # (i.e. the scale is active) then the scale's value is adjusted |
---|
| 152 | # to reflect the mouse's position. |
---|
| 153 | # |
---|
| 154 | # Arguments: |
---|
| 155 | # w - The scale widget. |
---|
| 156 | # x, y - Mouse coordinates. |
---|
| 157 | |
---|
| 158 | proc tkScaleDrag {w x y} { |
---|
| 159 | global tkPriv |
---|
| 160 | if {!$tkPriv(dragging)} { |
---|
| 161 | return |
---|
| 162 | } |
---|
| 163 | $w set [$w get [expr {$x-$tkPriv(deltaX)}] [expr {$y-$tkPriv(deltaY)}]] |
---|
| 164 | } |
---|
| 165 | |
---|
| 166 | # tkScaleEndDrag -- |
---|
| 167 | # This procedure is called to end an interactive drag of the |
---|
| 168 | # slider. It just marks the drag as over. |
---|
| 169 | # |
---|
| 170 | # Arguments: |
---|
| 171 | # w - The scale widget. |
---|
| 172 | |
---|
| 173 | proc tkScaleEndDrag {w} { |
---|
| 174 | global tkPriv |
---|
| 175 | set tkPriv(dragging) 0 |
---|
| 176 | $w configure -sliderrelief raised |
---|
| 177 | } |
---|
| 178 | |
---|
| 179 | # tkScaleIncrement -- |
---|
| 180 | # This procedure is invoked to increment the value of a scale and |
---|
| 181 | # to set up auto-repeating of the action if that is desired. The |
---|
| 182 | # way the value is incremented depends on the "dir" and "big" |
---|
| 183 | # arguments. |
---|
| 184 | # |
---|
| 185 | # Arguments: |
---|
| 186 | # w - The scale widget. |
---|
| 187 | # dir - "up" means move value towards -from, "down" means |
---|
| 188 | # move towards -to. |
---|
| 189 | # big - Size of increments: "big" or "little". |
---|
| 190 | # repeat - Whether and how to auto-repeat the action: "noRepeat" |
---|
| 191 | # means don't auto-repeat, "initial" means this is the |
---|
| 192 | # first action in an auto-repeat sequence, and "again" |
---|
| 193 | # means this is the second repetition or later. |
---|
| 194 | |
---|
| 195 | proc tkScaleIncrement {w dir big repeat} { |
---|
| 196 | global tkPriv |
---|
| 197 | if {![winfo exists $w]} return |
---|
| 198 | if {[string equal $big "big"]} { |
---|
| 199 | set inc [$w cget -bigincrement] |
---|
| 200 | if {$inc == 0} { |
---|
| 201 | set inc [expr {abs([$w cget -to] - [$w cget -from])/10.0}] |
---|
| 202 | } |
---|
| 203 | if {$inc < [$w cget -resolution]} { |
---|
| 204 | set inc [$w cget -resolution] |
---|
| 205 | } |
---|
| 206 | } else { |
---|
| 207 | set inc [$w cget -resolution] |
---|
| 208 | } |
---|
| 209 | if {([$w cget -from] > [$w cget -to]) ^ [string equal $dir "up"]} { |
---|
| 210 | set inc [expr {-$inc}] |
---|
| 211 | } |
---|
| 212 | $w set [expr {[$w get] + $inc}] |
---|
| 213 | |
---|
| 214 | if {[string equal $repeat "again"]} { |
---|
| 215 | set tkPriv(afterId) [after [$w cget -repeatinterval] \ |
---|
| 216 | [list tkScaleIncrement $w $dir $big again]] |
---|
| 217 | } elseif {[string equal $repeat "initial"]} { |
---|
| 218 | set delay [$w cget -repeatdelay] |
---|
| 219 | if {$delay > 0} { |
---|
| 220 | set tkPriv(afterId) [after $delay \ |
---|
| 221 | [list tkScaleIncrement $w $dir $big again]] |
---|
| 222 | } |
---|
| 223 | } |
---|
| 224 | } |
---|
| 225 | |
---|
| 226 | # tkScaleControlPress -- |
---|
| 227 | # This procedure handles button presses that are made with the Control |
---|
| 228 | # key down. Depending on the mouse position, it adjusts the scale |
---|
| 229 | # value to one end of the range or the other. |
---|
| 230 | # |
---|
| 231 | # Arguments: |
---|
| 232 | # w - The scale widget. |
---|
| 233 | # x, y - Mouse coordinates where the button was pressed. |
---|
| 234 | |
---|
| 235 | proc tkScaleControlPress {w x y} { |
---|
| 236 | set el [$w identify $x $y] |
---|
| 237 | if {[string equal $el "trough1"]} { |
---|
| 238 | $w set [$w cget -from] |
---|
| 239 | } elseif {[string equal $el "trough2"]} { |
---|
| 240 | $w set [$w cget -to] |
---|
| 241 | } |
---|
| 242 | } |
---|
| 243 | |
---|
| 244 | # tkScaleButton2Down |
---|
| 245 | # This procedure is invoked when button 2 is pressed over a scale. |
---|
| 246 | # It sets the value to correspond to the mouse position and starts |
---|
| 247 | # a slider drag. |
---|
| 248 | # |
---|
| 249 | # Arguments: |
---|
| 250 | # w - The scrollbar widget. |
---|
| 251 | # x, y - Mouse coordinates within the widget. |
---|
| 252 | |
---|
| 253 | proc tkScaleButton2Down {w x y} { |
---|
| 254 | global tkPriv |
---|
| 255 | |
---|
| 256 | if {[string equal [$w cget -state] "disabled"]} { |
---|
| 257 | return |
---|
| 258 | } |
---|
| 259 | $w configure -state active |
---|
| 260 | $w set [$w get $x $y] |
---|
| 261 | set tkPriv(dragging) 1 |
---|
| 262 | set tkPriv(initValue) [$w get] |
---|
| 263 | set coords "$x $y" |
---|
| 264 | set tkPriv(deltaX) 0 |
---|
| 265 | set tkPriv(deltaY) 0 |
---|
| 266 | } |
---|