VersaWhiteboard/scripts/s_whiteboard.js

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//This file is only for saving the whiteboard. (Not to a file, only to RAM atm. Whiteboard is gone after server restart)
var savedBoards = {};
var savedUndos = {};
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module.exports = {
handleEventsAndData: function (content) {
var tool = content["t"]; //Tool witch is used
var wid = content["wid"]; //whiteboard ID
var username = content["username"];
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if (tool === "clear") {
//Clear the whiteboard
delete savedBoards[wid];
delete savedUndos[wid];
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} else if (tool === "undo") {
//Undo an action
if (!savedUndos[wid]) {
savedUndos[wid] = [];
}
if (savedBoards[wid]) {
for (var i = savedBoards[wid].length - 1; i >= 0; i--) {
if (savedBoards[wid][i]["username"] == username) {
var drawId = savedBoards[wid][i]["drawId"];
for (var i = savedBoards[wid].length - 1; i >= 0; i--) {
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if (
savedBoards[wid][i]["drawId"] == drawId &&
savedBoards[wid][i]["username"] == username
) {
savedUndos[wid].push(savedBoards[wid][i]);
savedBoards[wid].splice(i, 1);
}
}
break;
}
}
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if (savedUndos[wid].length > 1000) {
savedUndos[wid].splice(0, savedUndos[wid].length - 1000);
}
}
} else if (tool === "redo") {
if (!savedUndos[wid]) {
savedUndos[wid] = [];
}
if (!savedBoards[wid]) {
savedBoards[wid] = [];
}
for (var i = savedUndos[wid].length - 1; i >= 0; i--) {
if (savedUndos[wid][i]["username"] == username) {
var drawId = savedUndos[wid][i]["drawId"];
for (var i = savedUndos[wid].length - 1; i >= 0; i--) {
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if (
savedUndos[wid][i]["drawId"] == drawId &&
savedUndos[wid][i]["username"] == username
) {
savedBoards[wid].push(savedUndos[wid][i]);
savedUndos[wid].splice(i, 1);
}
}
break;
}
}
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} else if (
[
"line",
"pen",
"rect",
"circle",
"eraser",
"addImgBG",
"recSelect",
"eraseRec",
"addTextBox",
"setTextboxText",
"removeTextbox",
"setTextboxPosition",
"setTextboxFontSize",
"setTextboxFontColor",
].includes(tool)
) {
//Save all this actions
if (!savedBoards[wid]) {
savedBoards[wid] = [];
}
delete content["wid"]; //Delete id from content so we don't store it twice
if (tool === "setTextboxText") {
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for (var i = savedBoards[wid].length - 1; i >= 0; i--) {
//Remove old textbox tex -> dont store it twice
if (
savedBoards[wid][i]["t"] === "setTextboxText" &&
savedBoards[wid][i]["d"][0] === content["d"][0]
) {
savedBoards[wid].splice(i, 1);
}
}
}
savedBoards[wid].push(content);
}
},
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loadStoredData: function (wid) {
//Load saved whiteboard
return savedBoards[wid] ? savedBoards[wid] : [];
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},
};