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annotate mgallery.js @ 154:0b87e7c1675c

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Improve the JavaScript event hook functions.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 07 Nov 2017 14:40:14 +0200
parents 606b05c31d5e
children ba02d12cb4be
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 2015-2017 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 mgalAddEvent(obname, evtype, evcallback)
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28 {
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29 mgalAddEventOb(obname, document.getElementById(obname), evtype, evcallback);
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30 }
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31
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32
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33 function mgalNavigateTo(url)
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34 {
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35 if (url != "")
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36 window.location = url;
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37 }
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38
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39
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40 function mgalProcessKeyPress(ev)
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41 {
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42 ev = ev || window.event;
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43 var key = ev.keyCode ? ev.keyCode : ev.which;
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44 switch (key)
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45 {
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46 case 37:
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47 case 65:
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48 case 52:
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49 // left
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50 mgalNavigateTo(mgalPrevURL);
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51 break;
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52
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53 case 39:
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54 case 68:
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55 case 54:
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56 // right
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57 mgalNavigateTo(mgalNextURL);
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58 break;
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59
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60 case 38:
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61 case 56:
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62 // up
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63 mgalNavigateTo(mgalUpURL);
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64 break;
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65
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66 default:
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67 return true;
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68 }
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69
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70 ev.preventDefault();
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71 return false;
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72 }
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73
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74
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75 function mgalGetWindowSize()
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76 {
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77 var winW = 0, winH = 0;
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78 if (typeof(window.innerWidth) == 'number')
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79 {
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80 // Non-MSIE
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81 winW = window.innerWidth;
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82 winH = window.innerHeight;
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83 }
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84 else
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85 if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight))
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86 {
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87 // MSIE 6+ in 'standards compliant mode'
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88 winW = document.documentElement.clientWidth;
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89 winH = document.documentElement.clientHeight;
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90 }
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91 else
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92 if (document.body && (document.body.clientWidth || document.body.clientHeight))
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93 {
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94 // MSIE 4 compatible
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95 winW = document.body.clientWidth;
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96 winH = document.body.clientHeight;
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97 }
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98
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99 return [winW, winH];
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100 }
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101
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102
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103 function mgalAdjustImageDo()
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104 {
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105 var eimg = document.getElementById("imageImage");
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106 var win = mgalGetWindowSize();
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107 var madj = 0.92;
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108 if (eimg)
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109 {
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110 if (eimg.width > eimg.height)
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111 {
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112 eimg.style.width = "100%";
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113 eimg.style.height = "auto";
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114 if (eimg.height > win[1] * madj)
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115 {
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116 eimg.style.width = "auto";
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117 eimg.style.height = (win[1] * madj)+"px";
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118 }
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119 }
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120 else
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121 {
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122 eimg.style.width = "auto";
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123 if (eimg.height > win[1] * madj)
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124 eimg.style.height = (win[1] * madj)+"px";
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125 else
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126 eimg.style.height = "100%";
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127 }
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128 }
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129 adjustPID = -1;
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130 }
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131
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132
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133 function mgalAdjustImage()
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134 {
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135 if (adjustPID == -1)
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136 adjustPID = setTimeout(mgalAdjustImageDo, 50);
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137 }
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138
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139
152
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140 function mgalDisplayInfo(mvstate)
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141 {
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142 var mvbut = document.getElementById("pageInfoButton");
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143 var mvelem = document.getElementById("pageInfoHeader");
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144 mvelem.style.display = mvstate ? "block" : "none";
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145 mvbut.style.display = !mvstate ? "block" : "none";
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146 mvInfoOpen = mvstate;
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147 }
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148
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149
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150 function mgalOpenInfo()
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151 {
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152 mgalDisplayInfo(true);
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153 }
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154
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155
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156 function mgalCloseInfo()
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157 {
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158 mgalDisplayInfo(false);
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159 }