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~ Copyright 2019-present Open Networking Foundation
~
~ Licensed under the Apache License, Version 2.0 (the "License");
~ you may not use this file except in compliance with the License.
~ You may obtain a copy of the License at
~
~     http://www.apache.org/licenses/LICENSE-2.0
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~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<svg:desc xmlns:svg="http://www.w3.org/2000/svg">The force layout layer. This is
    an SVG component that displays Nodes (Devices, Hosts and SubRegions) and
    Links. Positions of each are driven by a forces computation engine</svg:desc>
<svg:g xmlns:svg="http://www.w3.org/2000/svg" class="topo2-links">
    <svg:desc>Topology links</svg:desc>
    <!-- Template explanation: Creates an SVG Group and in
        line 1) use the svg component onos-linksvg, setting it's link
         Input parameter to the link item from the next line
        line 2) Use the built in NgFor directive to iterate through the
         set of links filtered by the filteredLinks() function.
        line 3) feed the highlightPorts of this (forcesvg) component in to
         the highlightsEnabled of the link component
        line 5) when the onos-linksvg component emits the selectedEvent,
         call the updateSelected() method of this (forcesvg) component
        line 6) feed the scale of this (forcesvg) component in to the scale
         of the link
    -->
    <svg:g onos-linksvg [link]="link"
           *ngFor="let link of filteredLinks()"
           [highlightsEnabled]="highlightPorts"
           (selectedEvent)="updateSelected($event)"
           [scale]="scale">
    </svg:g>
</svg:g>
<svg:g xmlns:svg="http://www.w3.org/2000/svg" class="topo2-nodes">
    <svg:desc>Topology nodes</svg:desc>
    <!-- Template explanation - create an SVG Group and
        line 1) use the svg component onos-devicenodesvg, setting it's device
         Input parameter to the device item from the next line
        line 2) Use the built in NgFor directive to iterate through all
         of the devices in the chosen layer index. The current iteration
         is in the device variable
        line 3) Use the onosDraggable directive and pass this device in to
         its draggableNode Input parameter and setting the draggableInGraph
         Input parameter to 'graph'
        line 4) event handler of the draggable directive - causes the new location
         to be written back to the server
        line 5) when the onos-devicenodesvg component emits the selectedEvent,
         call the updateSelected() method of this (forcesvg) component
        line 6) feed the devicelabeltoggle of this (forcesvg) component in to
         the labelToggle of the device
        line 7) feed the scale of this (forcesvg) component in to the scale
         of the device
    -->
    <svg:g onos-devicenodesvg [device]="device"
           *ngFor="let device of regionData.devices[visibleLayerIdx()]"
           onosDraggableNode [draggableNode]="device" [draggableInGraph]="graph"
               (newLocation)="nodeMoved('device', device.id, $event)"
           (selectedEvent)="updateSelected($event)"
            [labelToggle]="deviceLabelToggle"
            [scale]="scale">
        <svg:desc>Device nodes</svg:desc>
    </svg:g>
    <!-- Template explanation - only display the hosts if 'showHosts' is set true -->
    <svg:g *ngIf="showHosts">
        <!-- Template explanation - create an SVG Group and
            line 1) use the svg component onos-hostnodesvg, setting it's host
             Input parameter to the host item from the next line
            line 2) Use the built in NgFor directive to iterate through all
             of the hosts in the chosen layer index. The current iteration
             is in the 'host' variable
            line 3) Use the onosDraggable directive and pass this host in to
             its draggableNode Input parameter and setting the draggableInGraph
             Input parameter to 'graph'
            line 4) event handler of the draggable directive - causes the new location
             to be written back to the server
            line 5) when the onos-hostnodesvg component emits the selectedEvent
             call the updateSelected() method of this (forcesvg) component
            line 6) feed the hostLabelToggle of this (forcesvg) component in to
             the labelToggle of the host
            line 7) feed the scale of this (forcesvg) component in to the scale
             of the host
        -->
        <svg:g onos-hostnodesvg [host]="host"
               *ngFor="let host of regionData.hosts[visibleLayerIdx()]"
               onosDraggableNode [draggableNode]="host" [draggableInGraph]="graph"
                   (newLocation)="nodeMoved('host', host.id, $event)"
               (selectedEvent)="updateSelected($event)"
               [labelToggle]="hostLabelToggle"
               [scale]="scale">
            <svg:desc>Host nodes</svg:desc>
        </svg:g>
    </svg:g>
    <svg:g onos-subregionnodesvg [subRegion]="subRegion"
           *ngFor="let subRegion of regionData.subregions"
           onosDraggableNode [draggableNode]="subRegion" [draggableInGraph]="graph">
        <svg:desc>Subregion nodes</svg:desc>
    </svg:g>
</svg:g>