UX: Fix empty space in select (#19713)

packages/grafana-ui/src/components/Select/Select.story.tsx

+import React from 'react';
+import { storiesOf } from '@storybook/react';
+import { action } from '@storybook/addon-actions';
+import { withKnobs, object } from '@storybook/addon-knobs';
+import { withCenteredStory } from '../../utils/storybook/withCenteredStory';
+import { UseState } from '../../utils/storybook/UseState';
+import { SelectableValue } from '@grafana/data';
+import { Select } from './Select';
+
+const SelectStories = storiesOf('UI/Select/Select', module);
+
+SelectStories.addDecorator(withCenteredStory).addDecorator(withKnobs);
+
+SelectStories.add('default', () => {
+  const intialState: SelectableValue<string> = { label: 'A label', value: 'A value' };
+  const value = object<SelectableValue<string>>('Selected Value:', intialState);
+  const options = object<Array<SelectableValue<string>>>('Options:', [
+    intialState,
+    { label: 'Another label', value: 'Another value' },
+  ]);
+
+  return (
+    <UseState initialState={value}>
+      {(value, updateValue) => {
+        return (
+          <Select
+            value={value}
+            options={options}
+            onChange={value => {
+              action('onChanged fired')(value);
+              updateValue(value);
+            }}
+          />
+        );
+      }}
+    </UseState>
+  );
+});

packages/grafana-ui/src/components/Select/SingleValue.tsx

@@ -7,6 +7,7 @@ import { components } from '@torkelo/react-select';
 import { FadeTransition, Spinner } from '..';
 import { useDelayedSwitch } from '../../utils/useDelayedSwitch';
 import { stylesFactory } from '../../themes';
+import { SlideOutTransition } from '../transitions/SlideOutTransition';
 
 const getStyles = stylesFactory(() => {
   const container = css`
@@ -16,6 +17,7 @@ const getStyles = stylesFactory(() => {
     margin-right: 10px;
     position: relative;
     vertical-align: middle;
+    overflow: hidden;
   `;
 
   const item = css`
@@ -44,18 +46,32 @@ export const SingleValue = (props: Props) => {
   return (
     <components.SingleValue {...props}>
       <div className={cx('gf-form-select-box__img-value')}>
+        {data.imgUrl ? (
+          <FadeWithImage loading={loading} imgUrl={data.imgUrl} />
+        ) : (
+          <SlideOutTransition horizontal size={16} visible={loading} duration={150}>
             <div className={styles.container}>
-          <FadeTransition duration={150} visible={loading}>
               <Spinner className={styles.item} inline />
-          </FadeTransition>
-          {data.imgUrl && (
-            <FadeTransition duration={150} visible={!loading}>
-              <img className={styles.item} src={data.imgUrl} />
-            </FadeTransition>
-          )}
             </div>
+          </SlideOutTransition>
+        )}
         {children}
       </div>
     </components.SingleValue>
   );
 };
+
+const FadeWithImage = (props: { loading: boolean; imgUrl: string }) => {
+  const styles = getStyles();
+
+  return (
+    <div className={styles.container}>
+      <FadeTransition duration={150} visible={props.loading}>
+        <Spinner className={styles.item} inline />
+      </FadeTransition>
+      <FadeTransition duration={150} visible={!props.loading}>
+        <img className={styles.item} src={props.imgUrl} />
+      </FadeTransition>
+    </div>
+  );
+};

packages/grafana-ui/src/components/index.ts

@@ -89,6 +89,6 @@ export { ErrorBoundary, ErrorBoundaryAlert } from './ErrorBoundary/ErrorBoundary
 export { AlphaNotice } from './AlphaNotice/AlphaNotice';
 export { Spinner } from './Spinner/Spinner';
 export { FadeTransition } from './transitions/FadeTransition';
-
+export { SlideOutTransition } from './transitions/SlideOutTransition';
 // Segment
 export { Segment, SegmentAsync, SegmentSelect } from './Segment/';

packages/grafana-ui/src/components/transitions/SlideOutTransition.tsx

+import React from 'react';
+import { css } from 'emotion';
+import { CSSTransition } from 'react-transition-group';
+import { stylesFactory } from '../../themes';
+
+const getStyles = stylesFactory((duration: number, measurement: 'width' | 'height', size: number) => {
+  return {
+    enter: css`
+      label: enter;
+      ${measurement}: 0;
+      opacity: 0;
+    `,
+    enterActive: css`
+      label: enterActive;
+      ${measurement}: ${size}px;
+      opacity: 1;
+      transition: opacity ${duration}ms ease-out, ${measurement} ${duration}ms ease-out;
+    `,
+    exit: css`
+      label: exit;
+      ${measurement}: ${size}px;
+      opacity: 1;
+    `,
+    exitActive: css`
+      label: exitActive;
+      opacity: 0;
+      ${measurement}: 0;
+      transition: opacity ${duration}ms ease-out, ${measurement} ${duration}ms ease-out;
+    `,
+  };
+});
+
+type Props = {
+  children: React.ReactNode;
+  visible: boolean;
+  size: number;
+
+  duration?: number;
+  horizontal?: boolean;
+};
+
+export function SlideOutTransition(props: Props) {
+  const { visible, children, duration = 250, horizontal, size } = props;
+  const styles = getStyles(duration, horizontal ? 'width' : 'height', size);
+  return (
+    <CSSTransition in={visible} mountOnEnter={true} unmountOnExit={true} timeout={duration} classNames={styles}>
+      {children}
+    </CSSTransition>
+  );
+}

public/app/plugins/datasource/stackdriver/components/__snapshots__/QueryEditor.test.tsx.snap

@@ -318,9 +318,6 @@ Array [
                 <div
                   className="gf-form-select-box__img-value"
                 >
-                  <div
-                    className="css-zyq2zu"
-                  />
                   stackdriver auto
                 </div>
               </div>