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1 // CodeMirror, copyright (c) by Marijn Haverbeke and others
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2 // Distributed under an MIT license: https://codemirror.net/5/LICENSE
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3
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4 (function(mod) {
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5 if (typeof exports == "object" && typeof module == "object") // CommonJS
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6 mod(require("../../lib/codemirror"));
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7 else if (typeof define == "function" && define.amd) // AMD
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8 define(["../../lib/codemirror"], mod);
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9 else // Plain browser env
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10 mod(CodeMirror);
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11 })(function(CodeMirror) {
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12 "use strict";
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13
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14 CodeMirror.defineOption("scrollPastEnd", false, function(cm, val, old) {
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15 if (old && old != CodeMirror.Init) {
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16 cm.off("change", onChange);
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17 cm.off("refresh", updateBottomMargin);
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18 cm.display.lineSpace.parentNode.style.paddingBottom = "";
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19 cm.state.scrollPastEndPadding = null;
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20 }
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21 if (val) {
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22 cm.on("change", onChange);
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23 cm.on("refresh", updateBottomMargin);
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24 updateBottomMargin(cm);
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25 }
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26 });
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27
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28 function onChange(cm, change) {
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29 if (CodeMirror.changeEnd(change).line == cm.lastLine())
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30 updateBottomMargin(cm);
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31 }
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32
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33 function updateBottomMargin(cm) {
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34 var padding = "";
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35 if (cm.lineCount() > 1) {
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36 var totalH = cm.display.scroller.clientHeight - 30,
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37 lastLineH = cm.getLineHandle(cm.lastLine()).height;
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38 padding = (totalH - lastLineH) + "px";
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39 }
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40 if (cm.state.scrollPastEndPadding != padding) {
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41 cm.state.scrollPastEndPadding = padding;
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42 cm.display.lineSpace.parentNode.style.paddingBottom = padding;
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43 cm.off("refresh", updateBottomMargin);
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44 cm.setSize();
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45 cm.on("refresh", updateBottomMargin);
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46 }
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47 }
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48 });
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