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132 |
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133 |
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134 |
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135 |
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136 | <h1>Commands</h1>
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137 | <p>
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138 | Commands such as <b>Delete</b> or <b>Paste</b> or <b>Undo</b> are implemented by the <a>CommandHandler</a> class.
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139 | </p>
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140 | <p>
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141 | Keyboard events, like mouse and touch events, always go to the <a>Diagram.currentTool</a>.
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142 | The current tool, when the user is not performing some gesture, is the same as the <a>Diagram.defaultTool</a>,
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143 | which normally is the <a>Diagram.toolManager</a>.
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144 | The <a>ToolManager</a> handles keyboard events by delegating them to the <a>Diagram.commandHandler</a>.
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145 | </p>
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146 | <p>
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147 | Basically, the diagram handles a keyboard event, creates an <a>InputEvent</a> describing it,
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148 | and then calls <a>ToolManager.doKeyDown</a>. That in turn just calls <a>CommandHandler.doKeyDown</a>.
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149 | The same sequence happens for key-up events.
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150 | </p>
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151 | <p>
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152 | Please note that the handling of keyboard commands depends on the diagram getting focus and then getting keyboard events.
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153 | Do not apply any styling such as <pre class="lang-css"><code>canvas:focus { display: none; }</code></pre>.
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154 | </p>
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155 |
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156 | <h2 id="KeyboardCommandBindings">Keyboard command bindings</h2>
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157 | <p>
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158 | The <a>CommandHandler</a> implements the following command bindings for keyboard input:
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159 | </p>
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160 | <ul>
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161 | <li>Del & Backspace invoke <a>CommandHandler.deleteSelection</a></li>
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162 | <li>Ctrl-X & Shift-Del invoke <a>CommandHandler.cutSelection</a></li>
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163 | <li>Ctrl-C & Ctrl-Insert invoke <a>CommandHandler.copySelection</a></li>
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164 | <li>Ctrl-V & Shift-Insert invoke <a>CommandHandler.pasteSelection</a></li>
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165 | <li>Ctrl-A invokes <a>CommandHandler.selectAll</a></li>
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166 | <li>Ctrl-Z & Alt-Backspace invoke <a>CommandHandler.undo</a></li>
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167 | <li>Ctrl-Y & Alt-Shift-Backspace invoke <a>CommandHandler.redo</a></li>
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168 | <li>Up & Down & Left & Right (arrow keys) call <a>Diagram.scroll</a></li>
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169 | <li>PageUp & PageDown call <a>Diagram.scroll</a></li>
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170 | <li>Home & End call <a>Diagram.scroll</a></li>
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171 | <li>Space invokes <a>CommandHandler.scrollToPart</a></li>
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172 | <li>Keypad-- (minus) invokes <a>CommandHandler.decreaseZoom</a></li>
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173 | <li>Keypad-+ (plus) invokes <a>CommandHandler.increaseZoom</a></li>
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174 | <li>Ctrl-0 invokes <a>CommandHandler.resetZoom</a></li>
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175 | <li>Shift-Z invokes <a>CommandHandler.zoomToFit</a>; repeat to return to the original scale and position</li>
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176 | <li>Ctrl-G invokes <a>CommandHandler.groupSelection</a></li>
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177 | <li>Ctrl-Shift-G invokes <a>CommandHandler.ungroupSelection</a></li>
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178 | <li>F2 invokes <a>CommandHandler.editTextBlock</a></li>
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179 | <li>Menu Key invokes <a>CommandHandler.showContextMenu</a></li>
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180 | <li>Esc invokes <a>CommandHandler.stopCommand</a></li>
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181 | </ul>
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182 | <p>
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183 | On a Mac the Command key is used as the modifier instead of the Control key.
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184 | </p>
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185 | <p>
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186 | At the current time there are no keyboard bindings for commands such as <a>CommandHandler.collapseSubGraph</a>,
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187 | <a>CommandHandler.collapseTree</a>, <a>CommandHandler.expandSubGraph</a>, or <a>CommandHandler.expandTree</a>.
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188 | </p>
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189 | <p>
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190 | If you want to have a different behavior for the arrow keys, consider using the sample class extended from <a>CommandHandler</a>:
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191 | <a href="../extensions/DrawCommandHandler.js">DrawCommandHandler</a>, which implements options for having
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192 | the arrow keys move the selection or change the selection.
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193 | </p>
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194 | <p>
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195 | That DrawCommandHandler extension also demonstrates a customization of the <b>Copy</b> and <b>Paste</b> commands
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196 | to automatically shift the location of pasted copies.
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197 | </p>
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198 |
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199 | <h2 id="CommandHandler">CommandHandler</h2>
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200 | <p>
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201 | The <a>CommandHandler</a> class implements pairs of methods:
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202 | a method to execute a command and a predicate that is true when the command may be executed.
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203 | For example, for the <b>Copy</b> command, there is a <a>CommandHandler.copySelection</a> method
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204 | and a <a>CommandHandler.canCopySelection</a> method.
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205 | </p>
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206 | <p>
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207 | Keyboard event handling always calls the "can..." predicate first.
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208 | Only if that returns true does it actually call the method to execute the command.
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209 | </p>
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210 | <p>
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211 | There are a number of properties that you can set to affect the CommandHandler's standard behavior.
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212 | For example, if you want to allow the user to group selected parts together with the <a>CommandHandler.groupSelection</a>,
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213 | you will need to set <a>CommandHandler.archetypeGroupData</a> to a group node data object:
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214 | </p>
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215 | <pre class="lang-js"><code>
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216 | diagram.commandHandler.archetypeGroupData =
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217 | { key: "Group", isGroup: true, color: "blue" };
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218 | </code></pre>
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219 | <p>
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220 | That data object is copied and added to the model as the new group data object by <a>CommandHandler.groupSelection</a>.
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221 | </p>
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222 | <p>
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223 | If you want to add your own keyboard bindings, you can override the <a>CommandHandler.doKeyDown</a> method.
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224 | For example, to support using the "T" key to collapse or expand the currently selected <a>Group</a>:
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225 | </p>
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226 | <pre class="lang-js"><code>
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227 | myDiagram.commandHandler.doKeyDown = function() {
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228 | var e = myDiagram.lastInput;
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229 | var cmd = myDiagram.commandHandler;
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230 | if (e.key === "T") { // could also check for e.control or e.shift
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231 | if (cmd.canCollapseSubGraph()) {
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232 | cmd.collapseSubGraph();
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233 | } else if (cmd.canExpandSubGraph()) {
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234 | cmd.expandSubGraph();
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235 | }
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236 | } else {
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237 | // call base method with no arguments
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238 | go.CommandHandler.prototype.doKeyDown.call(cmd);
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239 | }
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240 | };
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241 | </code></pre>
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242 | <p>
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243 | Do not forget to call the base method in order to handle all of the keys that your method does not handle.
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244 | </p>
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245 | <p class="box bg-info">
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246 | Note that calling the base method involves getting the base class's prototype's method.
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247 | If the base method takes arguments, be sure to pass arguments to the call to the base method.
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248 | </p>
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249 |
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250 | <h2 id="UpdatingCommandUI">Updating command UI</h2>
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251 | <p>
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252 | It is common to have HTML elements outside of the diagram that invoke commands.
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253 | You can use the <a>CommandHandler</a>'s "can..." predicates to enable or disable UI that would invoke the command.
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254 | </p>
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255 | <pre class="lang-js" id="commands"><code>
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256 | // allow the group command to execute
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257 | diagram.commandHandler.archetypeGroupData =
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258 | { key: "Group", isGroup: true, color: "blue" };
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259 | // modify the default group template to allow ungrouping
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260 | diagram.groupTemplate.ungroupable = true;
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261 |
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262 | var nodeDataArray = [
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263 | { key: "Alpha" },
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264 | { key: "Beta" },
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265 | { key: "Delta", group: "Epsilon" },
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266 | { key: "Gamma", group: "Epsilon" },
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267 | { key: "Epsilon", isGroup: true }
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268 | ];
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269 | var linkDataArray = [
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270 | { from: "Alpha", to: "Beta" },
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271 | { from: "Beta", to: "Beta" },
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272 | { from: "Gamma", to: "Delta" },
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273 | { from: "Delta", to: "Alpha" }
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274 | ];
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275 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
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276 |
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277 | // enable or disable a particular button
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278 | function enable(name, ok) {
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279 | var button = document.getElementById(name);
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280 | if (button) button.disabled = !ok;
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281 | }
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282 | // enable or disable all command buttons
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283 | function enableAll() {
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284 | var cmdhnd = diagram.commandHandler;
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285 | enable("SelectAll", cmdhnd.canSelectAll());
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286 | enable("Cut", cmdhnd.canCutSelection());
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287 | enable("Copy", cmdhnd.canCopySelection());
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288 | enable("Paste", cmdhnd.canPasteSelection());
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289 | enable("Delete", cmdhnd.canDeleteSelection());
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290 | enable("Group", cmdhnd.canGroupSelection());
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291 | enable("Ungroup", cmdhnd.canUngroupSelection());
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292 | enable("Undo", cmdhnd.canUndo());
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293 | enable("Redo", cmdhnd.canRedo());
|
294 | }
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295 | // notice whenever the selection may have changed
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296 | diagram.addDiagramListener("ChangedSelection", function(e) {
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297 | enableAll();
|
298 | });
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299 | // notice when the Paste command may need to be reenabled
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300 | diagram.addDiagramListener("ClipboardChanged", function(e) {
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301 | enableAll();
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302 | });
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303 | // notice whenever a transaction or undo/redo has occurred
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304 | diagram.addModelChangedListener(function(e) {
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305 | if (e.isTransactionFinished) enableAll();
|
306 | });
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307 | // perform initial enablements after everything has settled down
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308 | setTimeout(enableAll, 100);
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309 | // make the diagram accessible to button onclick handlers
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310 | myDiagram = diagram;
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311 | // calls enableAll() due to Model Changed listener
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312 | myDiagram.undoManager.isEnabled = true;
|
313 | </code></pre>
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314 | <script>goCode("commands", 600, 150)</script>
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315 | <input id="SelectAll" type="button" onclick="myDiagram.commandHandler.selectAll()" value="Select All" />
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316 | <input id="Cut" type="button" onclick="myDiagram.commandHandler.cutSelection()" value="Cut" />
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317 | <input id="Copy" type="button" onclick="myDiagram.commandHandler.copySelection()" value="Copy" />
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318 | <input id="Paste" type="button" onclick="myDiagram.commandHandler.pasteSelection()" value="Paste" />
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319 | <input id="Delete" type="button" onclick="myDiagram.commandHandler.deleteSelection()" value="Delete" />
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320 | <input id="Group" type="button" onclick="myDiagram.commandHandler.groupSelection()" value="Group" />
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321 | <input id="Ungroup" type="button" onclick="myDiagram.commandHandler.ungroupSelection()" value="Ungroup" />
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322 | <input id="Undo" type="button" onclick="myDiagram.commandHandler.undo()" value="Undo" />
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323 | <input id="Redo" type="button" onclick="myDiagram.commandHandler.redo()" value="Redo" />
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324 |
|
325 | <p>
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326 | Each button is implemented in the following fashion:
|
327 | </p>
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328 | <pre class="lang-html"><code>
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329 | <input id="SelectAll" type="button"
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330 | onclick="myDiagram.commandHandler.selectAll()" value="Select All" />
|
331 | </code></pre>
|
332 | <p>
|
333 | Whenever the selection changes or whenever a transaction or undo or redo occurs,
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334 | the enableAll function is called to update the "disabled" property of each of the buttons.
|
335 | </p>
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336 |
|
337 | <h2 id="Accessibility">Accessibility</h2>
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338 | <p>
|
339 | Since <b>GoJS</b> is based on the HTML Canvas element,
|
340 | making an app that is accessible to screen-readers or other accessibility devices
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341 | is a matter of generating fallback content outside of GoJS,
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342 | just as you would generate fallback content separate from any HTML Canvas application.
|
343 | </p>
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344 | <p>
|
345 | Although much of the predefined functionality of the <a>CommandHandler</a> is accessible
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346 | with keyboard commands or the default context menu, not all of it is,
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347 | and the functionality of the <a>Tool</a>s mostly depends on mouse or touch events.
|
348 | We recommend that you implement alternative mechanisms specific to your application
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349 | for those tools that you want your users to access without a pointing device.
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350 | </p>
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351 |
|
352 | <h2 id="MoreCommandHandlerOverrideExamples">More CommandHandler override examples</h2>
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353 |
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354 | <p>
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355 | Stop CTRL+Z/CTRL+Y from doing an undo/redo, but still allow <a>CommandHandler.undo</a> and <a>CommandHandler.redo</a> to be called programatically:
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356 | </p>
|
357 | <pre class="lang-js"><code>
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358 | myDiagram.commandHandler.doKeyDown = function() {
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359 | var e = myDiagram.lastInput;
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360 | // The meta (Command) key substitutes for "control" for Mac commands
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361 | var control = e.control || e.meta;
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362 | var key = e.key;
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363 | // Quit on any undo/redo key combination:
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364 | if (control && (key === 'Z' || key === 'Y')) return;
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365 |
|
366 | // call base method with no arguments (default functionality)
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367 | go.CommandHandler.prototype.doKeyDown.call(this);
|
368 | };
|
369 | </code></pre>
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370 |
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371 | </div>
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372 | </div>
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373 |
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374 | <div class="bg-nwoods-primary">
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375 | <section class="max-w-screen-lg text-white container mx-auto py-2 px-12">
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376 | <p id="version" class="leading-none mb-2 my-4">GoJS</p>
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377 | </section>
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378 | </div><footer class="bg-nwoods-primary text-white">
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379 | <div class="container max-w-screen-lg mx-auto px-8">
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380 | <div class="w-full py-6">
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381 |
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382 | <div class="max-w-screen-lg xl:max-w-screen-xl mx-auto px-4 sm:px-6 md:px-8">
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383 | <ul class="text-sm font-medium pb-14 sm:pb-20 grid grid-cols-1 sm:grid-cols-3 gap-y-10">
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384 | <li class="list-none row-span-2">
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385 | <h2 class="text-base font-semibold tracking-wide">GoJS</h2>
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386 | <ul class="list-none space-y-4 md:space-y-1 px-0">
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387 | <li>
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388 | <a href="../samples/index.html">Samples</a>
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389 | </li>
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390 | <li>
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391 | <a href="../learn/index.html">Learn</a>
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392 | </li>
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393 | <li>
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394 | <a href="../intro/index.html">Intro</a>
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395 | </li>
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396 | <li>
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397 | <a href="../api/index.html">API</a>
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398 | </li>
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399 | <li>
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400 | <a href="../changelog.html">Changelog</a>
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401 | </li>
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402 | <li>
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403 | <a href="https://github.com/NorthwoodsSoftware/GoJS">GitHub</a>
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404 | </li>
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405 | </ul>
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406 | </li>
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407 | <li class="list-none row-span-2">
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408 | <h2 class="text-base font-semibold tracking-wide">Support</h2>
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409 | <ul class="list-none space-y-4 md:space-y-1 px-0">
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410 | <li>
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411 | <a href="https://www.nwoods.com/contact.html"
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412 | target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/contact.html', 'contact');">Contact</a>
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413 | </li>
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414 | <li>
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415 | <a href="https://forum.nwoods.com/c/gojs">Forum</a>
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416 | </li>
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417 | <li>
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418 | <a href="https://www.nwoods.com/app/activate.aspx?sku=gojs">Activate</a>
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419 | </li>
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420 | <li>
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421 | <a href="https://www.nwoods.com/sales/index.html"
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422 | target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/sales/index.html', 'buy');">Buy</a>
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423 | </li>
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424 | <li>
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425 | <a href="https://www.youtube.com/channel/UC9We8EoX596-6XFjJDtZIDg">Videos</a>
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426 | </li>
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427 | </ul>
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428 | </li>
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429 | <li class="list-none row-span-2">
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430 | <h2 class="text-base font-semibold tracking-wide">Company</h2>
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431 | <ul class="list-none space-y-4 md:space-y-1 px-0">
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432 | <li>
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433 | <a href="https://www.nwoods.com">Northwoods</a>
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434 | </li>
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435 | <li>
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436 | <a href="https://www.nwoods.com/about.html">About Us</a>
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437 | </li>
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438 | <li>
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439 | <a href="https://www.nwoods.com/contact.html">Contact Us</a>
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440 | </li>
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441 | <li>
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442 | <a href="https://twitter.com/northwoodsgo">Twitter</a>
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443 | </li>
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444 |
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445 | </ul>
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446 | </li>
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447 | </ul>
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448 |
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449 |
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450 | <p class="text-sm text-gray-100 md:mb-6">
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451 | Copyright 1998-2021 <a class="text-white" href="https://www.nwoods.com">Northwoods Software</a>
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452 | </p>
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453 | </div>
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454 | </div>
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455 | </footer> </body>
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456 |
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457 | <script async src="https://www.googletagmanager.com/gtag/js?id=UA-1506307-5"></script>
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458 | <script>
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459 | window.dataLayer = window.dataLayer || [];
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460 | function gtag(){dataLayer.push(arguments);}
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461 | gtag('js', new Date()); gtag('config', 'UA-1506307-5');
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462 | var getOutboundLink = function(url, label) {
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463 | gtag('event', 'click', {
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464 | 'event_category': 'outbound',
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465 | 'event_label': label,
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466 | 'transport_type': 'beacon'
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467 | });
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468 | }
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469 |
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470 |
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471 | var topButton = document.getElementById("topnavButton");
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472 | var topnavList = document.getElementById("topnavList");
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473 | topButton.addEventListener("click", function() {
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474 | this.classList.toggle("active");
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475 | topnavList.classList.toggle("hidden");
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476 | document.getElementById("topnavOpen").classList.toggle("hidden");
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477 | document.getElementById("topnavClosed").classList.toggle("hidden");
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478 | });
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479 | </script>
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480 | <script src="../assets/js/prism.js"></script>
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481 | <script src="../release/go.js"></script>
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482 | <script src="../assets/js/goDoc.js"></script>
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483 | <script>
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484 | document.addEventListener("DOMContentLoaded", function() {
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485 | if (window.go) document.getElementById('version').textContent = "GoJS version " + go.version;
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486 | if (window.goDoc) window.goDoc();
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487 | var d = window.diagrams;
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488 | for (var i = 0; i < d.length; i++) {
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489 | var dargs = d[i];
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490 | goCodeExecute(dargs[0], dargs[1], dargs[2], dargs[3], dargs[4]);
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491 | }
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492 | if (window.extra) window.extra();
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493 | });
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494 | </script>
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495 | </html>
|