PreBarrage

when deleting a wall, leave no basin without connection (connect to river upstream/downstream)
prevent deletion of walls that would be restored by the aforementioned mechanism
"del" hotkey to delete element on schema

src/app/components/pb-schema/pb-schema.component.ts

@@ -7,10 +7,13 @@ import {
 
 import * as mermaid from "mermaid";
 
+import { HotkeysService, Hotkey } from 'angular2-hotkeys';
+
 import { I18nService } from "../../services/internationalisation.service";
 import { PbSchema } from "../../formulaire/elements/pb-schema";
 import { DialogNewPbCloisonComponent } from "../dialog-new-pb-cloison/dialog-new-pb-cloison.component";
 import { GenericCalculatorComponent } from "../generic-calculator/calculator.component";
+import { AppComponent } from "../../app.component";
 
 /**
  * The interactive schema for calculator type "PreBarrage" (component)
@@ -63,8 +66,11 @@ export class PbSchemaComponent implements AfterViewInit, AfterContentInit, OnIni
     public constructor(
         @Inject(forwardRef(() => GenericCalculatorComponent)) private calculatorComponent: GenericCalculatorComponent,
         private i18nService: I18nService,
+        private hotkeysService: HotkeysService,
         private newPbCloisonDialog: MatDialog
-    ) { }
+    ) {
+        this.hotkeysService.add(new Hotkey("del", AppComponent.onHotkey(this.removeOnHotkey, this)));
+    }
 
     public get selectedItem(): any {
         return this._selectedItem;
@@ -413,12 +419,42 @@ export class PbSchemaComponent implements AfterViewInit, AfterContentInit, OnIni
     }
 
     public get enableRemoveButton() {
-        return (this._selectedItem !== undefined);
+        if (this._selectedItem === undefined) {
+            return false;
+        }
+        // if deleting a PbCloison would replace it by a new one at
+        // the same place (@see onRemoveClick), make it not deletable
+        if (this._selectedItem instanceof PbCloison) {
+            if ((
+                this._selectedItem.bassinAmont !== undefined
+                && this._selectedItem.bassinAmont.cloisonsAval.length === 1
+                && this._selectedItem.bassinAval === undefined
+            ) || (
+                this._selectedItem.bassinAval !== undefined
+                && this._selectedItem.bassinAval.cloisonsAmont.length === 1
+                && this._selectedItem.bassinAmont === undefined
+            )) {
+                return false;
+            }
+        }
+        return true;
     }
 
     /** Removes a basin or wall, and all related items */
     public onRemoveClick() {
         this.model.deleteChild(this._selectedItem.findPositionInParent());
+        // never let an unconnected basin ! (not done in model to prevent unwanted
+        // automatic child addition when clearing children)
+        if (this._selectedItem instanceof PbCloison) {
+            // if no downstream connections remain, connect to river downstream
+            if (this._selectedItem.bassinAmont !== undefined && this._selectedItem.bassinAmont.cloisonsAval.length === 0) {
+                this.model.addChild(new PbCloison(this._selectedItem.bassinAmont, undefined));
+            }
+            // if no upstream connections remain, connect to river upstream
+            if (this._selectedItem.bassinAval !== undefined && this._selectedItem.bassinAval.cloisonsAmont.length === 0) {
+                this.model.addChild(new PbCloison(undefined, this._selectedItem.bassinAval));
+            }
+        }
         this.unselect();
         this.refresh();
     }
@@ -427,6 +463,13 @@ export class PbSchemaComponent implements AfterViewInit, AfterContentInit, OnIni
         return this.i18nService.localizeText("INFO_FIELDSET_REMOVE");
     }
 
+    // listener for "del" hotkey
+    protected removeOnHotkey() {
+        if (this.enableRemoveButton) {
+            this.onRemoveClick();
+        }
+    }
+
     public get enableCopyButton() {
         return (this._selectedItem !== undefined && this._selectedItem instanceof PbCloison);
     }
@@ -559,7 +602,10 @@ export class PbSchemaComponent implements AfterViewInit, AfterContentInit, OnIni
     private updateValidity() {
         // check that at least 1 basin is present and a route from river
         // upstream to river downstream exists (2nd check includes 1st)
-        this._isValid = this.model.hasUpDownConnection();
+        this._isValid = (
+            this.model.hasUpDownConnection()
+            && ! this.model.hasBasinNotConnected()
+        );
         console.log("schéma valide", this._isValid);
         this.validChange.emit();
     }