1 | # ruler.tcl -- |
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2 | # |
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3 | # This demonstration script creates a canvas widget that displays a ruler |
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4 | # with tab stops that can be set, moved, and deleted. |
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5 | # |
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6 | # RCS: @(#) $Id: ruler.tcl,v 1.3 2001/06/14 10:56:58 dkf Exp $ |
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7 | |
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8 | if {![info exists widgetDemo]} { |
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9 | error "This script should be run from the \"widget\" demo." |
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10 | } |
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11 | |
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12 | # rulerMkTab -- |
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13 | # This procedure creates a new triangular polygon in a canvas to |
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14 | # represent a tab stop. |
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15 | # |
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16 | # Arguments: |
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17 | # c - The canvas window. |
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18 | # x, y - Coordinates at which to create the tab stop. |
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19 | |
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20 | proc rulerMkTab {c x y} { |
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21 | upvar #0 demo_rulerInfo v |
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22 | $c create polygon $x $y [expr {$x+$v(size)}] [expr {$y+$v(size)}] \ |
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23 | [expr {$x-$v(size)}] [expr {$y+$v(size)}] |
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24 | } |
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25 | |
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26 | set w .ruler |
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27 | global tk_library |
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28 | catch {destroy $w} |
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29 | toplevel $w |
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30 | wm title $w "Ruler Demonstration" |
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31 | wm iconname $w "ruler" |
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32 | positionWindow $w |
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33 | set c $w.c |
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34 | |
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35 | label $w.msg -font $font -wraplength 5i -justify left -text "This canvas widget shows a mock-up of a ruler. You can create tab stops by dragging them out of the well to the right of the ruler. You can also drag existing tab stops. If you drag a tab stop far enough up or down so that it turns dim, it will be deleted when you release the mouse button." |
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36 | pack $w.msg -side top |
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37 | |
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38 | frame $w.buttons |
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39 | pack $w.buttons -side bottom -fill x -pady 2m |
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40 | button $w.buttons.dismiss -text Dismiss -command "destroy $w" |
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41 | button $w.buttons.code -text "See Code" -command "showCode $w" |
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42 | pack $w.buttons.dismiss $w.buttons.code -side left -expand 1 |
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43 | |
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44 | canvas $c -width 14.8c -height 2.5c |
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45 | pack $w.c -side top -fill x |
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46 | |
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47 | set demo_rulerInfo(grid) .25c |
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48 | set demo_rulerInfo(left) [winfo fpixels $c 1c] |
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49 | set demo_rulerInfo(right) [winfo fpixels $c 13c] |
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50 | set demo_rulerInfo(top) [winfo fpixels $c 1c] |
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51 | set demo_rulerInfo(bottom) [winfo fpixels $c 1.5c] |
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52 | set demo_rulerInfo(size) [winfo fpixels $c .2c] |
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53 | set demo_rulerInfo(normalStyle) "-fill black" |
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54 | if {[winfo depth $c] > 1} { |
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55 | set demo_rulerInfo(activeStyle) "-fill red -stipple {}" |
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56 | set demo_rulerInfo(deleteStyle) [list -fill red \ |
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57 | -stipple @[file join $tk_library demos images gray25.bmp]] |
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58 | } else { |
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59 | set demo_rulerInfo(activeStyle) "-fill black -stipple {}" |
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60 | set demo_rulerInfo(deleteStyle) [list -fill black \ |
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61 | -stipple @[file join $tk_library demos images gray25.bmp]] |
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62 | } |
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63 | |
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64 | $c create line 1c 0.5c 1c 1c 13c 1c 13c 0.5c -width 1 |
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65 | for {set i 0} {$i < 12} {incr i} { |
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66 | set x [expr {$i+1}] |
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67 | $c create line ${x}c 1c ${x}c 0.6c -width 1 |
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68 | $c create line $x.25c 1c $x.25c 0.8c -width 1 |
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69 | $c create line $x.5c 1c $x.5c 0.7c -width 1 |
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70 | $c create line $x.75c 1c $x.75c 0.8c -width 1 |
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71 | $c create text $x.15c .75c -text $i -anchor sw |
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72 | } |
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73 | $c addtag well withtag [$c create rect 13.2c 1c 13.8c 0.5c \ |
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74 | -outline black -fill [lindex [$c config -bg] 4]] |
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75 | $c addtag well withtag [rulerMkTab $c [winfo pixels $c 13.5c] \ |
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76 | [winfo pixels $c .65c]] |
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77 | |
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78 | $c bind well <1> "rulerNewTab $c %x %y" |
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79 | $c bind tab <1> "rulerSelectTab $c %x %y" |
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80 | bind $c <B1-Motion> "rulerMoveTab $c %x %y" |
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81 | bind $c <Any-ButtonRelease-1> "rulerReleaseTab $c" |
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82 | |
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83 | # rulerNewTab -- |
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84 | # Does all the work of creating a tab stop, including creating the |
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85 | # triangle object and adding tags to it to give it tab behavior. |
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86 | # |
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87 | # Arguments: |
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88 | # c - The canvas window. |
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89 | # x, y - The coordinates of the tab stop. |
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90 | |
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91 | proc rulerNewTab {c x y} { |
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92 | upvar #0 demo_rulerInfo v |
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93 | $c addtag active withtag [rulerMkTab $c $x $y] |
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94 | $c addtag tab withtag active |
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95 | set v(x) $x |
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96 | set v(y) $y |
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97 | rulerMoveTab $c $x $y |
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98 | } |
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99 | |
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100 | # rulerSelectTab -- |
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101 | # This procedure is invoked when mouse button 1 is pressed over |
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102 | # a tab. It remembers information about the tab so that it can |
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103 | # be dragged interactively. |
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104 | # |
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105 | # Arguments: |
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106 | # c - The canvas widget. |
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107 | # x, y - The coordinates of the mouse (identifies the point by |
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108 | # which the tab was picked up for dragging). |
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109 | |
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110 | proc rulerSelectTab {c x y} { |
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111 | upvar #0 demo_rulerInfo v |
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112 | set v(x) [$c canvasx $x $v(grid)] |
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113 | set v(y) [expr {$v(top)+2}] |
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114 | $c addtag active withtag current |
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115 | eval "$c itemconf active $v(activeStyle)" |
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116 | $c raise active |
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117 | } |
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118 | |
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119 | # rulerMoveTab -- |
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120 | # This procedure is invoked during mouse motion events to drag a tab. |
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121 | # It adjusts the position of the tab, and changes its appearance if |
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122 | # it is about to be dragged out of the ruler. |
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123 | # |
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124 | # Arguments: |
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125 | # c - The canvas widget. |
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126 | # x, y - The coordinates of the mouse. |
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127 | |
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128 | proc rulerMoveTab {c x y} { |
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129 | upvar #0 demo_rulerInfo v |
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130 | if {[$c find withtag active] == ""} { |
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131 | return |
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132 | } |
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133 | set cx [$c canvasx $x $v(grid)] |
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134 | set cy [$c canvasy $y] |
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135 | if {$cx < $v(left)} { |
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136 | set cx $v(left) |
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137 | } |
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138 | if {$cx > $v(right)} { |
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139 | set cx $v(right) |
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140 | } |
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141 | if {($cy >= $v(top)) && ($cy <= $v(bottom))} { |
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142 | set cy [expr {$v(top)+2}] |
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143 | eval "$c itemconf active $v(activeStyle)" |
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144 | } else { |
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145 | set cy [expr {$cy-$v(size)-2}] |
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146 | eval "$c itemconf active $v(deleteStyle)" |
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147 | } |
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148 | $c move active [expr {$cx-$v(x)}] [expr {$cy-$v(y)}] |
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149 | set v(x) $cx |
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150 | set v(y) $cy |
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151 | } |
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152 | |
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153 | # rulerReleaseTab -- |
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154 | # This procedure is invoked during button release events that end |
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155 | # a tab drag operation. It deselects the tab and deletes the tab if |
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156 | # it was dragged out of the ruler. |
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157 | # |
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158 | # Arguments: |
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159 | # c - The canvas widget. |
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160 | # x, y - The coordinates of the mouse. |
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161 | |
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162 | proc rulerReleaseTab c { |
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163 | upvar #0 demo_rulerInfo v |
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164 | if {[$c find withtag active] == {}} { |
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165 | return |
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166 | } |
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167 | if {$v(y) != $v(top)+2} { |
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168 | $c delete active |
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169 | } else { |
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170 | eval "$c itemconf active $v(normalStyle)" |
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171 | $c dtag active |
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172 | } |
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173 | } |
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