Resizable columns for TreeTable

src/components/datatable/DataTable.vue

@@ -943,7 +943,7 @@ export default {
                     'p-datatable-hoverable-rows': (this.rowHover || this.selectionMode),
                     'p-datatable-auto-layout': this.autoLayout,
                     'p-datatable-resizable': this.resizableColumns, 
-                    'p-datatable-resizable-fit': this.resizableColumns && this.columnResizeMode === 'fit', 
+                    'p-datatable-resizable-fit': this.resizableColumns && this.columnResizeMode === 'fit'
                 }
             ];
         },

src/components/treetable/TreeTable.vue

@@ -19,11 +19,12 @@
                 <slot name="paginatorRight"></slot>
             </template>
         </TTPaginator>
-        <div class="p-treetable-wrapper">
+        <div class="p-treetable-tablewrapper">
-            <table>
+            <table ref="table">
                 <thead class="p-treetable-thead">
                     <tr>
                         <th v-for="(col,i) of columns" :key="col.columnKey||col.field||i" :style="col.headerStyle" :class="getColumnHeaderClass(col)" @click="onColumnHeaderClick($event, col)">
+                            <span class="p-column-resizer p-clickable" @mousedown="onColumnResizeStart" v-if="resizableColumns"></span>
                             <TTColumnSlot :column="col" type="header" v-if="col.$scopedSlots.header" />
                             <span class="p-column-title" v-if="col.header">{{col.header}}</span>
                             <span v-if="col.sortable" :class="getSortableColumnIcon(col)"></span>
@@ -65,6 +66,7 @@
         <div class="p-treetable-footer" v-if="$scopedSlots.footer">
             <slot name="footer"></slot>
         </div>
+        <div ref="resizeHelper" class="p-column-resizer-helper p-highlight" style="display: none"></div>
     </div>
 </template>
 
@@ -185,8 +187,20 @@ export default {
         filterMode: {
             type: String,
             default: 'lenient'
+        },
+        resizableColumns: {
+            type: Boolean,
+            default: false
+        },
+        columnResizeMode: {
+            type: String,
+            default: 'fit'
         }
     },
+    documentColumnResizeListener: null,
+    documentColumnResizeEndListener: null,
+    lastResizeHelperX: null,
+    resizeColumnElement: null,
     data() {
         return {
             allChildren: null,
@@ -341,6 +355,7 @@ export default {
 
             return [column.headerClass, 
                     {'p-sortable-column': column.sortable}, 
+                    {'p-resizable-column': this.resizableColumns},
                     {'p-highlight': sorted}
             ];
         },
@@ -604,13 +619,97 @@ export default {
         },
         isNodeLeaf(node) {
             return node.leaf === false ? false : !(node.children && node.children.length);
+        },
+        onColumnResizeStart(event) {
+            let containerLeft = DomHandler.getOffset(this.$el).left;
+            this.resizeColumnElement = event.target.parentElement;
+            this.columnResizing = true;
+            this.lastResizeHelperX = (event.pageX - containerLeft + this.$el.scrollLeft);
+
+            this.bindColumnResizeEvents();
+        },
+        onColumnResize(event) {
+            let containerLeft = DomHandler.getOffset(this.$el).left;
+            DomHandler.addClass(this.$el, 'p-unselectable-text');
+            this.$refs.resizeHelper.style.height = this.$el.offsetHeight + 'px';
+            this.$refs.resizeHelper.style.top = 0 + 'px';
+            this.$refs.resizeHelper.style.left = (event.pageX - containerLeft + this.$el.scrollLeft) + 'px';
+            
+            this.$refs.resizeHelper.style.display = 'block';
+        },
+        onColumnResizeEnd() {
+            let delta = this.$refs.resizeHelper.offsetLeft - this.lastResizeHelperX;
+            let columnWidth = this.resizeColumnElement.offsetWidth;
+            let newColumnWidth = columnWidth + delta;
+            let minWidth = this.resizeColumnElement.style.minWidth||15;
+
+            if(columnWidth + delta > parseInt(minWidth, 10)) {
+                if(this.columnResizeMode === 'fit') {
+                    let nextColumn = this.resizeColumnElement.nextElementSibling;
+                    let nextColumnWidth = nextColumn.offsetWidth - delta;
+                    
+                    if(newColumnWidth > 15 && nextColumnWidth > 15) {
+                        this.resizeColumnElement.style.width = newColumnWidth + 'px';
+                        if(nextColumn) {
+                            nextColumn.style.width = nextColumnWidth + 'px';
+                        }
+                    }
+                }
+                else if(this.columnResizeMode === 'expand') {
+                    this.$refs.table.style.width = this.$refs.table.offsetWidth + delta + 'px';
+                    this.resizeColumnElement.style.width = newColumnWidth + 'px';
+                }    
+                
+                this.$emit('column-resize-end', {
+                    element: this.resizeColumnElement,
+                    delta: delta
+                });
+            }
+                    
+            this.$refs.resizeHelper.style.display = 'none';
+            this.resizeColumn = null;
+            DomHandler.removeClass(this.$el, 'p-unselectable-text');
+
+            this.unbindColumnResizeEvents();
+        },
+        bindColumnResizeEvents() {
+            if (!this.documentColumnResizeListener) {
+                this.documentColumnResizeListener = document.addEventListener('mousemove', (event) => {
+                    if(this.columnResizing) {
+                        this.onColumnResize(event);
+                    }
+                });
+            }
+            
+            if (!this.documentColumnResizeEndListener) {
+                this.documentColumnResizeEndListener = document.addEventListener('mouseup', (event) => {
+                    if(this.columnResizing) {
+                        this.columnResizing = false;
+                        this.onColumnResizeEnd();
+                    }
+                });
+            }
+            
+        },
+        unbindColumnResizeEvents() {
+            if (this.documentColumnResizeListener) {
+                document.removeEventListener('document', this.documentColumnResizeListener);
+                this.documentColumnResizeListener = null;
+            }
+            
+            if (this.documentColumnResizeEndListener) {
+                document.removeEventListener('document', this.documentColumnResizeEndListener);
+                 this.documentColumnResizeEndListener = null;
+            }
         }
     },
     computed: {
         containerClass() {
             return ['p-treetable p-component', {
                 'p-treetable-hoverable-rows': (this.rowHover || this.rowSelectionMode),
-                'p-treetable-auto-layout': this.autoLayout
+                'p-treetable-auto-layout': this.autoLayout,
+                'p-treetable-resizable': this.resizableColumns, 
+                'p-treetable-resizable-fit': this.resizableColumns && this.columnResizeMode === 'fit', 
             }];
         },
         columns() {

src/router.js

@@ -430,6 +430,11 @@ export default new Router({
 			path: '/treetable/responsive',
 			name: 'treetableresponsive',
 			component: () => import('./views/treetable/TreeTableResponsiveDemo.vue')
+        },
+        {
+			path: '/treetable/colresize',
+			name: 'treetablecolresize',
+			component: () => import('./views/treetable/TreeTableColResizeDemo.vue')
         },
 		{
 			path: '/tristatecheckbox',

src/views/datatable/DataTableColResizeDemo.vue

@@ -6,25 +6,25 @@
 			<div class="feature-intro">
 				<h1>DataTable - Column Resize</h1>
 				<p>Columns can be resized using drag drop by setting the resizableColumns to true. There are two resize modes; "fit" and "expand". Fit is the default one and the overall table width does not change when a column is resized. 
-                    In "expand" mode, table width also changes along with the column width. onColumnResize is a callback that passes the resized column header as a parameter.</p>
+                    In "expand" mode, table width also changes along with the column width.</p>
 			</div>
 		</div>
 
 		<div class="content-section implementation">
             <h3>Fit Mode</h3>
 			<DataTable :value="cars" :resizableColumns="true" columnResizeMode="fit">
-                <Column field="vin" header="Vin" :resizable="true"></Column>
+                <Column field="vin" header="Vin"></Column>
-                <Column field="year" header="Year" :resizable="true"></Column>
+                <Column field="year" header="Year"></Column>
-                <Column field="brand" header="Brand" :resizable="true"></Column>
+                <Column field="brand" header="Brand"></Column>
-                <Column field="color" header="Color" :resizable="true"></Column>
+                <Column field="color" header="Color"></Column>
             </DataTable>
 
             <h3>Expand Mode</h3>
 			<DataTable :value="cars" :resizableColumns="true" columnResizeMode="expand">
-                <Column field="vin" header="Vin" :resizable="true"></Column>
+                <Column field="vin" header="Vin"></Column>
-                <Column field="year" header="Year" :resizable="true"></Column>
+                <Column field="year" header="Year"></Column>
-                <Column field="brand" header="Brand" :resizable="true"></Column>
+                <Column field="brand" header="Brand"></Column>
-                <Column field="color" header="Color" :resizable="true"></Column>
+                <Column field="color" header="Color"></Column>
             </DataTable>
 		</div>
 
@@ -35,18 +35,18 @@
 <template v-pre>
 &lt;h3&gt;Fit Mode&lt;/h3&gt;
 &lt;DataTable :value="cars" :resizableColumns="true" columnResizeMode="fit"&gt;
-    &lt;Column field="vin" header="Vin" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="vin" header="Vin"&gt;&lt;/Column&gt;
-    &lt;Column field="year" header="Year" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="year" header="Year"&gt;&lt;/Column&gt;
-    &lt;Column field="brand" header="Brand" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="brand" header="Brand"&gt;&lt;/Column&gt;
-    &lt;Column field="color" header="Color" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="color" header="Color"&gt;&lt;/Column&gt;
 &lt;/DataTable&gt;
 
 &lt;h3&gt;Expand Mode&lt;/h3&gt;
 &lt;DataTable :value="cars" :resizableColumns="true" columnResizeMode="expand"&gt;
-    &lt;Column field="vin" header="Vin" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="vin" header="Vin"&gt;&lt;/Column&gt;
-    &lt;Column field="year" header="Year" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="year" header="Year"&gt;&lt;/Column&gt;
-    &lt;Column field="brand" header="Brand" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="brand" header="Brand"&gt;&lt;/Column&gt;
-    &lt;Column field="color" header="Color" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="color" header="Color"&gt;&lt;/Column&gt;
 &lt;/DataTable&gt;
 </template>
 </CodeHighlight>

src/views/datatable/DataTableDoc.vue

@@ -540,10 +540,10 @@ data() {
 <CodeHighlight>
 <template v-pre>
 &lt;DataTable :value="cars" :resizableColumns="true" columnResizeMode="fit | expand"&gt;
-    &lt;Column field="vin" header="Vin" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="vin" header="Vin"&gt;&lt;/Column&gt;
-    &lt;Column field="year" header="Year" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="year" header="Year"&gt;&lt;/Column&gt;
-    &lt;Column field="brand" header="Brand" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="brand" header="Brand"&gt;&lt;/Column&gt;
-    &lt;Column field="color" header="Color" :resizable="true"&gt;&lt;/Column&gt;
+    &lt;Column field="color" header="Color"&gt;&lt;/Column&gt;
 &lt;/DataTable&gt;
 </template>
 </CodeHighlight>
@@ -552,10 +552,10 @@ data() {
 <CodeHighlight>
 <template v-pre>
 &lt;DataTable :value="cars" :resizableColumns="true" columnResizeMode="fit | expand"&gt;
-    &lt;Column field="vin" header="Vin" :resizable="true" headerStyle="width: 20%"&gt;&lt;/Column&gt;
+    &lt;Column field="vin" header="Vin" headerStyle="width: 20%"&gt;&lt;/Column&gt;
-    &lt;Column field="year" header="Year" :resizable="true" headerStyle="width: 40%"&gt;&lt;/Column&gt;
+    &lt;Column field="year" header="Year" headerStyle="width: 40%"&gt;&lt;/Column&gt;
-    &lt;Column field="brand" header="Brand" :resizable="true" headerStyle="width: 20%"&gt;&lt;/Column&gt;
+    &lt;Column field="brand" header="Brand" headerStyle="width: 20%"&gt;&lt;/Column&gt;
-    &lt;Column field="color" header="Color" :resizable="true" headerStyle="width: 20%"&gt;&lt;/Column&gt;
+    &lt;Column field="color" header="Color" headerStyle="width: 20%"&gt;&lt;/Column&gt;
 &lt;/DataTable&gt;
 </template>
 </CodeHighlight>

src/views/treetable/TreeTableColResizeDemo.vue

@@ -0,0 +1,52 @@
+<template>
+    <div>
+        <TreeTableSubMenu />
+
+        <div class="content-section introduction">
+			<div class="feature-intro">
+				<h1>TreeTable - Column Resize</h1>
+				<p>Columns can be resized using drag drop by setting the resizableColumns to true. There are two resize modes; "fit" and "expand". Fit is the default one and the overall table width does not change when a column is resized. 
+                    In "expand" mode, table width also changes along with the column width.</p>
+			</div>
+		</div>
+
+        <div class="content-section implementation">
+            <h3>Fit Mode</h3>
+            <TreeTable :value="nodes" :resizableColumns="true" columnResizeMode="fit">
+                <Column field="name" header="Name" :expander="true"></Column>
+                <Column field="size" header="Size"></Column>
+                <Column field="type" header="Type"></Column>
+            </TreeTable>
+
+            <h3>Expand Mdoe</h3>
+            <TreeTable :value="nodes" :resizableColumns="true" columnResizeMode="expand">
+                <Column field="name" header="Name" :expander="true"></Column>
+                <Column field="size" header="Size"></Column>
+                <Column field="type" header="Type"></Column>
+            </TreeTable>
+        </div>
+    </div>
+</template>
+
+<script>
+import NodeService from '../../service/NodeService';
+import TreeTableSubMenu from './TreeTableSubMenu';
+
+export default {
+    data() {
+        return {
+            nodes: null
+        }
+    },
+    nodeService: null,
+    created() {
+        this.nodeService = new NodeService();
+    },
+    mounted() {
+        this.nodeService.getTreeTableNodes().then(data => this.nodes = data);
+    },
+    components: {
+        'TreeTableSubMenu': TreeTableSubMenu
+    }
+}
+</script>

src/views/treetable/TreeTableSubMenu.vue

@@ -9,7 +9,7 @@
             <li><router-link to="/treetable/selection">&#9679; Selection</router-link></li>
             <li><router-link to="/treetable/lazy">&#9679; Lazy</router-link></li>
             <li><router-link to="/treetable/coltoggle">&#9679; ColToggle</router-link></li>
-            <li><router-link to="/treetable/resize">&#9679; Resize</router-link></li>
+            <li><router-link to="/treetable/colresize">&#9679; Resize</router-link></li>
             <li><router-link to="/treetable/responsive">&#9679; Responsive</router-link></li>
         </ul>
     </div>