DashNav: refactor action buttons and custom content (#23868)

* DashNav: refactor action buttons and custom content

* DashNav: remove code duplication

* DashNav: fix custom element display

* DashNav: fix strictNullChecks

public/app/features/dashboard/components/DashNav/DashNav.tsx

 // Libaries
-import React, { FC, PureComponent } from 'react';
+import React, { PureComponent, FC, ReactNode } from 'react';
 import { connect } from 'react-redux';
 import { css } from 'emotion';
 // Utils & Services
@@ -27,10 +27,21 @@ export interface OwnProps {
   onAddPanel: () => void;
 }
 
-const customNavbarContent: Array<FC<Partial<OwnProps>>> = [];
+interface DashNavButtonModel {
+  show: (props: Props) => boolean;
+  component: FC<Partial<Props>>;
+  index?: number | 'end';
+}
+
+const customLeftActions: DashNavButtonModel[] = [];
+const customRightActions: DashNavButtonModel[] = [];
+
+export function addCustomLeftAction(content: DashNavButtonModel) {
+  customLeftActions.push(content);
+}
 
-export function addNavbarContent(content: FC<Partial<OwnProps>>) {
-  customNavbarContent.push(content);
+export function addCustomRightAction(content: DashNavButtonModel) {
+  customRightActions.push(content);
 }
 
 export interface StateProps {
@@ -102,6 +113,60 @@ class DashNav extends PureComponent<Props> {
     this.forceUpdate();
   };
 
+  addCustomContent(actions: DashNavButtonModel[], buttons: ReactNode[]) {
+    actions.map((action, index) => {
+      const Component = action.component;
+      const element = <Component {...this.props} key={`button-custom-${index}`} />;
+      typeof action.index === 'number' ? buttons.splice(action.index, 0, element) : buttons.push(element);
+    });
+  }
+
+  renderLeftActionsButton() {
+    const { dashboard } = this.props;
+    const { canStar, canShare, isStarred } = dashboard.meta;
+
+    const buttons: ReactNode[] = [];
+    if (canStar) {
+      buttons.push(
+        <DashNavButton
+          tooltip="Mark as favorite"
+          classSuffix="star"
+          icon={isStarred ? 'favorite' : 'star'}
+          iconType={isStarred ? 'mono' : 'default'}
+          iconSize="lg"
+          noBorder={true}
+          onClick={this.onStarDashboard}
+          key="button-star"
+        />
+      );
+    }
+
+    if (canShare) {
+      buttons.push(
+        <ModalsController key="button-share">
+          {({ showModal, hideModal }) => (
+            <DashNavButton
+              tooltip="Share dashboard"
+              classSuffix="share"
+              icon="share-alt"
+              iconSize="lg"
+              noBorder={true}
+              onClick={() => {
+                showModal(ShareModal, {
+                  dashboard,
+                  onDismiss: hideModal,
+                });
+              }}
+            />
+          )}
+        </ModalsController>
+      );
+    }
+
+    this.addCustomContent(customLeftActions, buttons);
+    return buttons;
+  }
+
   renderDashboardTitleSearchButton() {
     const { dashboard, isFullscreen } = this.props;
     /* Hard-coded value so we don't have to wrap whole component in withTheme because of 1 variable */
@@ -135,6 +200,7 @@ class DashNav extends PureComponent<Props> {
             </a>
           </div>
         </div>
+        <div className="navbar-buttons navbar-buttons--actions">{this.renderLeftActionsButton()}</div>
         <div className="navbar__spacer" />
       </>
     );
@@ -148,12 +214,75 @@ class DashNav extends PureComponent<Props> {
     );
   }
 
-  render() {
-    const { dashboard, onAddPanel, location, isFullscreen } = this.props;
-    const { canStar, canSave, canShare, showSettings, isStarred } = dashboard.meta;
+  renderRightActionsButton() {
+    const { dashboard, onAddPanel } = this.props;
+    const { canSave, showSettings } = dashboard.meta;
     const { snapshot } = dashboard;
     const snapshotUrl = snapshot && snapshot.originalUrl;
 
+    const buttons: ReactNode[] = [];
+    if (canSave) {
+      buttons.push(
+        <DashNavButton
+          classSuffix="save"
+          tooltip="Add panel"
+          icon="panel-add"
+          onClick={onAddPanel}
+          iconType="mono"
+          iconSize="xl"
+          key="button-panel-add"
+        />
+      );
+      buttons.push(
+        <ModalsController key="button-save">
+          {({ showModal, hideModal }) => (
+            <DashNavButton
+              tooltip="Save dashboard"
+              classSuffix="save"
+              icon="save"
+              onClick={() => {
+                showModal(SaveDashboardModalProxy, {
+                  dashboard,
+                  onDismiss: hideModal,
+                });
+              }}
+            />
+          )}
+        </ModalsController>
+      );
+    }
+
+    if (snapshotUrl) {
+      buttons.push(
+        <DashNavButton
+          tooltip="Open original dashboard"
+          classSuffix="snapshot-origin"
+          href={textUtil.sanitizeUrl(snapshotUrl)}
+          icon="link"
+          key="button-snapshot"
+        />
+      );
+    }
+
+    if (showSettings) {
+      buttons.push(
+        <DashNavButton
+          tooltip="Dashboard settings"
+          classSuffix="settings"
+          icon="cog"
+          onClick={this.onOpenSettings}
+          key="button-settings"
+        />
+      );
+    }
+
+    this.addCustomContent(customRightActions, buttons);
+    return buttons;
+  }
+
+  render() {
+    const { dashboard, location, isFullscreen } = this.props;
+
     return (
       <div className="navbar">
         {isFullscreen && this.renderBackButton()}
@@ -182,86 +311,7 @@ class DashNav extends PureComponent<Props> {
           </div>
         )}
 
-        {customNavbarContent.map((Component, index) => (
-          <Component {...this.props} key={`navbar-custom-content-${index}`} />
-        ))}
-
-        <div className="navbar-buttons navbar-buttons--actions">
-          {canSave && (
-            <DashNavButton
-              classSuffix="save"
-              tooltip="Add panel"
-              icon="panel-add"
-              onClick={onAddPanel}
-              iconType="mono"
-              iconSize="xl"
-            />
-          )}
-
-          {canStar && (
-            <DashNavButton
-              tooltip="Mark as favorite"
-              classSuffix="star"
-              icon={isStarred ? 'favorite' : 'star'}
-              iconType={isStarred ? 'mono' : 'default'}
-              onClick={this.onStarDashboard}
-            />
-          )}
-
-          {canShare && (
-            <ModalsController>
-              {({ showModal, hideModal }) => (
-                <DashNavButton
-                  tooltip="Share dashboard"
-                  classSuffix="share"
-                  icon="share-alt"
-                  onClick={() => {
-                    showModal(ShareModal, {
-                      dashboard,
-                      onDismiss: hideModal,
-                    });
-                  }}
-                />
-              )}
-            </ModalsController>
-          )}
-
-          {canSave && (
-            <ModalsController>
-              {({ showModal, hideModal }) => (
-                <DashNavButton
-                  tooltip="Save dashboard"
-                  classSuffix="save"
-                  icon="save"
-                  onClick={() => {
-                    showModal(SaveDashboardModalProxy, {
-                      dashboard,
-                      onDismiss: hideModal,
-                    });
-                  }}
-                />
-              )}
-            </ModalsController>
-          )}
-
-          {snapshotUrl && (
-            <DashNavButton
-              tooltip="Open original dashboard"
-              classSuffix="snapshot-origin"
-              href={textUtil.sanitizeUrl(snapshotUrl)}
-              icon="link"
-            />
-          )}
-
-          {showSettings && (
-            <DashNavButton
-              tooltip="Dashboard settings"
-              classSuffix="settings"
-              icon="cog"
-              onClick={this.onOpenSettings}
-            />
-          )}
-        </div>
+        <div className="navbar-buttons navbar-buttons--actions">{this.renderRightActionsButton()}</div>
 
         <div className="navbar-buttons navbar-buttons--tv">
           <DashNavButton tooltip="Cycle view mode" classSuffix="tv" icon="monitor" onClick={this.onToggleTVMode} />

public/app/features/dashboard/components/DashNav/DashNavButton.tsx

 // Libraries
 import React, { FunctionComponent } from 'react';
+import { css } from 'emotion';
 // Components
-import { Icon, IconName, IconSize, IconType, Tooltip } from '@grafana/ui';
+import { Tooltip, Icon, IconName, IconType, IconSize, IconButton, useTheme, stylesFactory } from '@grafana/ui';
 import { selectors } from '@grafana/e2e-selectors';
+import { GrafanaTheme } from '@grafana/data';
 
 interface Props {
   icon?: IconName;
@@ -13,8 +15,16 @@ interface Props {
   children?: React.ReactNode;
   iconType?: IconType;
   iconSize?: IconSize;
+  noBorder?: boolean;
 }
 
+const getStyles = stylesFactory((theme: GrafanaTheme) => ({
+  noBorderContainer: css`
+    padding: 0 ${theme.spacing.xs};
+    display: flex;
+  `,
+}));
+
 export const DashNavButton: FunctionComponent<Props> = ({
   icon,
   iconType,
@@ -24,10 +34,31 @@ export const DashNavButton: FunctionComponent<Props> = ({
   onClick,
   href,
   children,
+  noBorder,
 }) => {
-  if (onClick) {
+  const theme = useTheme();
+  const styles = getStyles(theme);
+
+  if (noBorder) {
     return (
-      <Tooltip content={tooltip} placement="bottom">
+      <div className={styles.noBorderContainer}>
+        {icon && (
+          <IconButton
+            name={icon}
+            size={iconSize}
+            iconType={iconType}
+            tooltip={tooltip}
+            tooltipPlacement="bottom"
+            onClick={onClick}
+          />
+        )}
+        {children}
+      </div>
+    );
+  }
+  return (
+    <Tooltip content={tooltip} placement="bottom">
+      {onClick ? (
         <button
           className={`btn navbar-button navbar-button--${classSuffix}`}
           onClick={onClick}
@@ -36,16 +67,12 @@ export const DashNavButton: FunctionComponent<Props> = ({
           {icon && <Icon name={icon} type={iconType} size={iconSize || 'lg'} />}
           {children}
         </button>
-      </Tooltip>
-    );
-  }
-
-  return (
-    <Tooltip content={tooltip} placement="bottom">
-      <a className={`btn navbar-button navbar-button--${classSuffix}`} href={href}>
-        {icon && <Icon name={icon} type={iconType} size="lg" />}
-        {children}
-      </a>
+      ) : (
+        <a className={`btn navbar-button navbar-button--${classSuffix}`} href={href}>
+          {icon && <Icon name={icon} type={iconType} size="lg" />}
+          {children}
+        </a>
+      )}
     </Tooltip>
   );
 };