First part of migrating Topo2 to GUI2

Change-Id: I316dd34cba161688e01dfb7b340bff5f2c3c57d4
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.css b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.css
new file mode 100644
index 0000000..fca0dc7
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.css
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2018-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
+ *
+ * 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.
+ */
+
+/**
+ * ONOS GUI -- Topology Zoom Layer -- CSS file
+ */
\ No newline at end of file
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.html b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.html
new file mode 100644
index 0000000..6f1bb4b
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.html
@@ -0,0 +1,19 @@
+<!--
+~ Copyright 2018-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
+~
+~ 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:g id="topo-zoomlayer">
+    <svg:g onos-backgroundsvg/>
+    <svg:g onos-forcesvg/>
+</svg:g>
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.spec.ts b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.spec.ts
new file mode 100644
index 0000000..60a1997
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.spec.ts
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2018-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
+ *
+ * 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.
+ */
+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { ActivatedRoute, Params } from '@angular/router';
+import { of } from 'rxjs';
+
+import { ZoomLayerSvgComponent } from './zoomlayersvg.component';
+import {
+    FnService,
+    LogService,
+    ZoomService
+} from 'gui2-fw-lib';
+
+class MockActivatedRoute extends ActivatedRoute {
+    constructor(params: Params) {
+        super();
+        this.queryParams = of(params);
+    }
+}
+
+class MockZoomService {}
+
+/**
+ * ONOS GUI -- Topology View Zoom Layer -- Unit Tests
+ */
+describe('ZoomLayerSvgComponent', () => {
+    let fs: FnService;
+    let ar: MockActivatedRoute;
+    let windowMock: Window;
+    let logServiceSpy: jasmine.SpyObj<LogService>;
+    let component: ZoomLayerSvgComponent;
+    let fixture: ComponentFixture<ZoomLayerSvgComponent>;
+
+    beforeEach(async(() => {
+        const logSpy = jasmine.createSpyObj('LogService', ['info', 'debug', 'warn', 'error']);
+        ar = new MockActivatedRoute({ 'debug': 'txrx' });
+
+        windowMock = <any>{
+            location: <any>{
+                hostname: 'foo',
+                host: 'foo',
+                port: '80',
+                protocol: 'http',
+                search: { debug: 'true' },
+                href: 'ws://foo:123/onos/ui/websock/path',
+                absUrl: 'ws://foo:123/onos/ui/websock/path'
+            }
+        };
+        fs = new FnService(ar, logSpy, windowMock);
+
+        TestBed.configureTestingModule({
+            declarations: [ ZoomLayerSvgComponent ],
+            providers: [
+                { provide: FnService, useValue: fs },
+                { provide: LogService, useValue: logSpy },
+                { provide: 'Window', useValue: windowMock },
+                { provide: ZoomService, useClass: MockZoomService }
+            ]
+        })
+        .compileComponents();
+        logServiceSpy = TestBed.get(LogService);
+    }));
+
+    beforeEach(() => {
+        fixture = TestBed.createComponent(ZoomLayerSvgComponent);
+        component = fixture.componentInstance;
+        fixture.detectChanges();
+    });
+
+    it('should create', () => {
+        expect(component).toBeTruthy();
+    });
+});
diff --git a/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.ts b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.ts
new file mode 100644
index 0000000..e0c85ed
--- /dev/null
+++ b/web/gui2/src/main/webapp/app/view/topology/layer/zoomlayersvg/zoomlayersvg.component.ts
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2018-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
+ *
+ * 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.
+ */
+import { Component, OnInit } from '@angular/core';
+import {
+    FnService,
+    LogService,
+    ZoomService, Zoomer, ZoomOpts
+} from 'gui2-fw-lib';
+
+/**
+ * ONOS GUI -- Topology Zoom Layer View.
+ * View that contains the 'Force graph' message
+ *
+ * This component is an SVG snippet that expects to be in an SVG element with a view box of 1000x1000
+ *
+ * It should be added to a template with a tag like <svg:g onos-zoomlayer />
+ */
+@Component({
+  selector: '[onos-zoomlayer]',
+  templateUrl: './zoomlayersvg.component.html',
+  styleUrls: ['./zoomlayersvg.component.css']
+})
+export class ZoomLayerSvgComponent implements OnInit {
+    zoomer: Zoomer;
+    zoomEventListeners: any[];
+
+    constructor(
+        protected fs: FnService,
+        protected log: LogService,
+        protected zs: ZoomService
+    ) {
+        this.log.debug('ZoomLayerSvgComponent constructed');
+    }
+
+    ngOnInit() {
+
+    }
+
+    createZoomer(options: ZoomOpts) {
+        // need to wrap the original zoom callback to extend its behavior
+        const origCallback = this.fs.isF(options.zoomCallback) ? options.zoomCallback : () => {};
+
+        options.zoomCallback = () => {
+            origCallback([0, 0], 1);
+
+            this.zoomEventListeners.forEach((ev) => ev(this.zoomer));
+        };
+
+        this.zoomer = this.zs.createZoomer(options);
+        return this.zoomer;
+    }
+
+    getZoomer() {
+        return this.zoomer;
+    }
+
+    findZoomEventListener(ev) {
+        for (let i = 0, len = this.zoomEventListeners.length; i < len; i++) {
+            if (this.zoomEventListeners[i] === ev) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    addZoomEventListener(callback) {
+        this.zoomEventListeners.push(callback);
+    }
+
+    removeZoomEventListener(callback) {
+        const evIndex = this.findZoomEventListener(callback);
+
+        if (evIndex !== -1) {
+            this.zoomEventListeners.splice(evIndex);
+        }
+    }
+
+    adjustmentScale(min: number, max: number): number {
+        let _scale = 1;
+        const size = (min + max) / 2;
+
+        if (size * this.scale() < max) {
+            _scale = min / (size * this.scale());
+        } else if (size * this.scale() > max) {
+            _scale = min / (size * this.scale());
+        }
+
+        return _scale;
+    }
+
+    scale(): number {
+        return this.zoomer.scale();
+    }
+
+    panAndZoom(translate: number[], scale: number, transition?: number) {
+        this.zoomer.panZoom(translate, scale, transition);
+    }
+
+}