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annotate mgallery.js @ 209:671b7cfebf87

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Various fixes and adjustments to style.
author Matti Hamalainen <ccr@tnsp.org>
date Thu, 22 Mar 2018 13:41:36 +0200
parents cdccda315a0f
children 0a0a2936d779
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1 //
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2 // Yet Another Image Gallery
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3 // -- Main Javascript utility functions file
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4 // Programmed and designed by Matti 'ccr' Hamalainen <ccr@tnsp.org>
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5 // (C) Copyright 2015-2018 Tecnic Software productions (TNSP)
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6 //
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7
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8
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9 function mgalAddEventOb(obname, evobj, evtype, evcallback)
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10 {
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11 if (evobj == null || typeof(evobj) == 'undefined')
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12 {
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13 console.log("Event object '"+ obname +"' == null.");
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14 return;
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15 }
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16
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17 if (evobj.addEventListener)
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18 evobj.addEventListener(evtype, evcallback, false);
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19 else
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20 if (evobj.attachEvent)
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21 evobj.attachEvent("on"+evtype, evcallback);
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22 else
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23 evobj["on"+evtype] = evcallback;
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24 }
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25
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26
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27 function mgalAddEventsToClass(clname, evtype, evcallback)
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28 {
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29 var elist = document.getElementsByClassName(clname);
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30 for (var index = 0; index < elist.length; index++)
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31 {
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32 mgalAddEventOb(clname, elist[index], evtype, evcallback);
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33 }
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34 }
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35
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36
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37 function mgalAddEvent(obname, evtype, evcallback)
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38 {
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39 mgalAddEventOb(obname, document.getElementById(obname), evtype, evcallback);
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40 }
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41
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42
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43 function mgalNavigateTo(url)
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44 {
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45 if (url != "")
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46 window.location = url;
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47 }
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48
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49
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50 function mgalProcessKeyPress(ev)
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51 {
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52 ev = ev || window.event;
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53 var key = ev.keyCode ? ev.keyCode : ev.which;
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54 switch (key)
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55 {
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56 case 37:
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57 case 65:
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58 case 52:
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59 // left
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60 mgalNavigateTo(mgalPrevURL);
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61 break;
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62
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63 case 39:
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64 case 68:
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65 case 54:
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66 // right
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67 mgalNavigateTo(mgalNextURL);
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68 break;
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69
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70 case 38:
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71 case 56:
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72 // up
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73 mgalNavigateTo(mgalUpURL);
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74 break;
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75
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76 default:
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77 return true;
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78 }
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79
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80 ev.preventDefault();
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81 return false;
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82 }
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83
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84
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85 function mgalGetElementOrWindowSize(nelem)
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86 {
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87 if (nelem)
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88 {
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89 var elem = document.getElementById(nelem);
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90 if (elem)
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91 return [elem.clientWidth, elem.clientHeight];
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92 }
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93
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94 if (typeof(window.innerWidth) == 'number')
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95 {
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96 // Non-MSIE
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97 return [window.innerWidth, window.innerHeight];
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98 }
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99
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100 if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight))
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101 {
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102 // MSIE 6+ in 'standards compliant mode'
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103 return [document.documentElement.clientWidth, document.documentElement.clientHeight];
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104 }
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105
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106 if (document.body && (document.body.clientWidth || document.body.clientHeight))
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107 {
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108 // MSIE 4 compatible
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109 return [document.body.clientWidth, document.body.clientHeight];
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110 }
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111
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112 return null;
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113 }
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114
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115
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116 function mgalAdjustImageDo()
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117 {
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118 var eimg = document.getElementById("imageImage");
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119 var win = mgalGetElementOrWindowSize("pageImageBox");
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120 var madj = 0.99;
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121 if (eimg && win != null)
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122 {
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123 if (eimg.width > eimg.height)
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124 {
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125 eimg.style.width = "100%";
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126 eimg.style.height = "auto";
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127 if (eimg.height > win[1] * madj)
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128 {
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129 eimg.style.width = "auto";
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130 eimg.style.height = (win[1] * madj)+"px";
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131 }
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132 }
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133 else
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134 {
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135 eimg.style.width = "auto";
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136 eimg.style.height = "100%";
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137 if (eimg.height > win[1] * madj)
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138 eimg.style.height = (win[1] * madj)+"px";
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139 }
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140 }
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141 adjustPID = -1;
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142 }
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143
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144
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145 function mgalAdjustImage()
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146 {
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147 if (adjustPID == -1)
174
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148 adjustPID = setTimeout(mgalAdjustImageDo, 10);
149
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149 }
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150
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151
152
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152 function mgalDisplayInfo(mvstate)
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153 {
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154 var mvbut = document.getElementById("pageInfoButton");
168
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155 var mvnbut = document.getElementById("pageUpNaviButton");
152
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156 var mvelem = document.getElementById("pageInfoHeader");
168
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157 mvelem.style.display = mvstate ? "block" : "none";
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158 mvbut.style.display = !mvstate ? "block" : "none";
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159 mvnbut.style.display = !mvstate ? "block" : "none";
152
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160 mvInfoOpen = mvstate;
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161 }
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162
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163
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164 function mgalOpenInfo()
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165 {
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166 mgalDisplayInfo(true);
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167 }
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168
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169
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170 function mgalCloseInfo()
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171 {
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172 mgalDisplayInfo(false);
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173 }
196
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174
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175
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176 function mgalPreventDefault(ev)
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177 {
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178 ev.preventDefault();
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179 ev.target.click();
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180 }