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64 | <a href="index.html">Basics</a>
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65 | <a href="buildingObjects.html">Building Parts</a>
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66 | <a href="usingModels.html">Using Models</a>
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67 | <a href="dataBinding.html">Data Binding</a>
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68 | <a href="react.html">GoJS with React</a>
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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>Groups Without Placeholders</h1>
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137 | <p>
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138 | Although it is very common to use a <a>Placeholder</a> inside a <a>Group</a>, it is not required.
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139 | Using a <a>Shape</a>, for example, instead of a <a>Placeholder</a> permits features such as
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140 | having a group maintain a fixed size, independent of the sizes and positions of its member nodes,
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141 | and even when there are no member nodes at all.
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142 | It also may allow the user to resize the "area" if that functionality is desired.
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143 | </p>
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144 |
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145 | <h2 id="FixedSizeGroups">Fixed size Groups</h2>
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146 | <p>
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147 | Not using a <a>Placeholder</a> in a <a>Group</a> means that you have to maintain the size and position of the group,
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148 | because it cannot depend on the size and position of its member nodes.
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149 | In these examples we will explicitly set and/or bind the <a>Part.location</a> of the nodes, including the groups.
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150 | The <a>Shape</a> that replaces the Placeholder in the group's template should also get its <a>GraphObject.desiredSize</a> set or bound.
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151 | </p>
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152 | <pre class="lang-js" id="fixedSize"><code>
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153 | diagram.nodeTemplate =
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154 | $(go.Node,
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155 | new go.Binding("location", "loc", go.Point.parse),
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156 | $(go.TextBlock,
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157 | new go.Binding("text", "key"))
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158 | );
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159 |
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160 | diagram.groupTemplate =
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161 | $(go.Group, "Vertical",
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162 | { selectionObjectName: "PH",
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163 | locationObjectName: "PH" },
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164 | new go.Binding("location", "loc", go.Point.parse),
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165 | $(go.TextBlock, // group title
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166 | { font: "Bold 12pt Sans-Serif" },
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167 | new go.Binding("text", "key")),
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168 | $(go.Shape, // using a Shape instead of a Placeholder
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169 | { name: "PH",
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170 | fill: "lightyellow" },
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171 | new go.Binding("desiredSize", "size", go.Size.parse))
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172 | );
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173 |
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174 | var nodeDataArray = [
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175 | { key: "Alpha", loc: "0 0" },
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176 | { key: "Beta", group: "Omega", loc: "75 75" },
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177 | { key: "Gamma", group: "Omega", loc: "125 75" },
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178 | { key: "Omega", isGroup: true, loc: "50 50", size: "150 50" },
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179 | { key: "Delta", loc: "200 0" }
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180 | ];
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181 | var linkDataArray = [
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182 | { from: "Alpha", to: "Beta" }, // from outside the Group to inside it
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183 | { from: "Beta", to: "Gamma" }, // this link is a member of the Group
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184 | { from: "Omega", to: "Delta" } // from the Group to a Node
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185 | ];
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186 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
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187 | diagram.select(diagram.findNodeForKey("Omega"));
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188 | </code></pre>
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189 | <script>goCode("fixedSize", 600, 150)</script>
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190 | <p>
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191 | Note that moving the "Beta" or "Gamma" nodes does <i>not</i> change the size or position of the "Omega" group.
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192 | However moving or copying or deleting the group includes those member nodes in the operation.
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193 | </p>
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194 | <p>
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195 | One can control where the user may drag member nodes.
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196 | For example, the <a href="../samples/swimlanes.html" target="_blank">Swim Lanes</a> sample
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197 | demonstrates a custom <a>Part.dragComputation</a> function that limits the
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198 | motion of a member node to stay within its containing group.
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199 | </p>
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200 |
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201 | <h2 id="ResizableGroups">Resizable Groups</h2>
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202 | <p>
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203 | You can make the main shape resizable by the user.
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204 | (At the current time groups are not rotatable.)
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205 | </p>
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206 | <p>
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207 | This example also makes the <a>Part.location</a> and <a>GraphObject.desiredSize</a> data bindings TwoWay,
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208 | so that as the user moves groups or resizes their main shapes, the data in the model is updated automatically.
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209 | </p>
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210 | <pre class="lang-js" id="resizable"><code>
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211 | diagram.nodeTemplate =
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212 | $(go.Node,
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213 | new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
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214 | $(go.TextBlock,
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215 | new go.Binding("text", "key"))
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216 | );
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217 |
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218 | diagram.groupTemplate =
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219 | $(go.Group, "Vertical",
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220 | { selectionObjectName: "PH",
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221 | locationObjectName: "PH",
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222 | resizable: true,
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223 | resizeObjectName: "PH" },
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224 | new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
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225 | $(go.TextBlock, // group title
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226 | { font: "Bold 12pt Sans-Serif" },
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227 | new go.Binding("text", "key")),
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228 | $(go.Shape, // using a Shape instead of a Placeholder
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229 | { name: "PH",
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230 | fill: "lightyellow" },
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231 | new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify))
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232 | );
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233 |
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234 | var nodeDataArray = [
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235 | { key: "Alpha", loc: "0 0" },
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236 | { key: "Beta", group: "Omega", loc: "75 75" },
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237 | { key: "Gamma", group: "Omega", loc: "125 75" },
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238 | { key: "Omega", isGroup: true, loc: "50 50", size: "150 50" },
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239 | { key: "Delta", loc: "200 0" }
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240 | ];
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241 | var linkDataArray = [
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242 | { from: "Alpha", to: "Beta" }, // from outside the Group to inside it
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243 | { from: "Beta", to: "Gamma" }, // this link is a member of the Group
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244 | { from: "Omega", to: "Delta" } // from the Group to a Node
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245 | ];
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246 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
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247 | diagram.select(diagram.findNodeForKey("Omega"));
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248 | </code></pre>
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249 | <script>goCode("resizable", 600, 150)</script>
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250 | <p>
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251 | It is also possible to control how the user resizes a group.
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252 | For example, the <a href="../samples/swimlanes.html" target="_blank">Swim Lanes</a> sample
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253 | demonstrates a custom <a>ResizingTool</a> that limits how small each lane can go.
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254 | It also demonstrates a custom <a>Adornment</a> that has only two resize handles.
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255 | </p>
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256 |
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257 | <h2 id="ContainersThatAreNotGroups">Containers that are not Groups</h2>
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258 | <p>
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259 | You do not have to use <a>Group</a>s as the only mechanism by which to organize a collection of <a>Part</a>s.
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260 | For example, the <a href="../samples/swimBands.html" target="_blank">Layer Bands</a> sample demonstrates
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261 | how some <a>Layout</a>s can be customized to automatically maintain the positions and sizes of special parts
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262 | that are in the background, appearing to surround the nodes that belong to each layout layer.
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263 | </p>
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264 | <p>
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265 | Not using <a>Group</a>s also means that it becomes possible to avoid some of the restrictions inherent in Groups,
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266 | such as the limitation that each Part can have at most one <a>Part.containingGroup</a>.
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267 | The <a href="../samples/sharedStates.html" target="_blank">Shared States</a> sample demonstrates how one can make
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268 | it appear that more than one "group" can contain a node.
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269 | However, this requires some additional custom <a>Tool</a>s and custom <a>Layout</a>s,
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270 | or always explicitly setting/binding the location and size of every node and "group".
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271 | </p>
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272 |
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273 | </div>
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275 |
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385 | <script>
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386 | document.addEventListener("DOMContentLoaded", function() {
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387 | if (window.go) document.getElementById('version').textContent = "GoJS version " + go.version;
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388 | if (window.goDoc) window.goDoc();
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389 | var d = window.diagrams;
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390 | for (var i = 0; i < d.length; i++) {
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391 | var dargs = d[i];
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392 | goCodeExecute(dargs[0], dargs[1], dargs[2], dargs[3], dargs[4]);
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393 | }
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394 | if (window.extra) window.extra();
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395 | });
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396 | </script>
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397 | </html>
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