fix(Dropdown): fix handling of "Space" key (#4041)

* fix(Dropdown): fix handling of "Space" key

* fix UTs, add a test

Author: layershifter

.babel-preset.js

@@ -17,6 +17,7 @@ const browsers = [
 
 const plugins = [
   ['@babel/plugin-proposal-class-properties', { loose: true }],
+  ['@babel/plugin-proposal-optional-chaining', { loose: true }],
   '@babel/plugin-proposal-export-default-from',
   '@babel/plugin-proposal-export-namespace-from',
   '@babel/plugin-syntax-dynamic-import',

src/modules/Dropdown/Dropdown.js

@@ -239,10 +239,20 @@ export default class Dropdown extends Component {
   openOnSpace = (e) => {
     debug('openOnSpace()')
 
-    if (keyboardKey.getCode(e) !== keyboardKey.Spacebar) return
+    const shouldHandleEvent =
+      this.state.focus && !this.state.open && keyboardKey.getCode(e) === keyboardKey.Spacebar
+    const shouldPreventDefault =
+      e.target?.tagName !== 'INPUT' &&
+      e.target?.tagName !== 'TEXTAREA' &&
+      e.target?.isContentEditable !== true
+
+    if (shouldHandleEvent) {
+      if (shouldPreventDefault) {
+        e.preventDefault()
+      }
 
-    e.preventDefault()
-    this.open(e)
+      this.open(e)
+    }
   }
 
   openOnArrow = (e) => {
@@ -549,6 +559,7 @@ export default class Dropdown extends Component {
   handleKeyDown = (e) => {
     this.moveSelectionOnKeyDown(e)
     this.openOnArrow(e)
+    this.openOnSpace(e)
     this.selectItemOnEnter(e)
 
     _.invoke(this.props, 'onKeyDown', e)
@@ -1089,7 +1100,6 @@ export default class Dropdown extends Component {
           {open && <EventStack name='click' on={this.closeOnDocumentClick} />}
 
           {focus && <EventStack name='keydown' on={this.removeItemOnBackspace} />}
-          {focus && !open && <EventStack name='keydown' on={this.openOnSpace} />}
         </ElementType>
       </Ref>
     )

test/specs/modules/Dropdown/Dropdown-test.js

@@ -530,7 +530,7 @@ describe('Dropdown', () => {
       document.activeElement.blur()
 
       // doesn't open on space
-      domEvent.keyDown(document, { key: ' ' })
+      wrapper.simulate('keydown', { key: 'Spacebar' })
       wrapper.update()
       dropdownMenuIsClosed()
     })
@@ -1263,6 +1263,7 @@ describe('Dropdown', () => {
     })
 
     it('opens on space when focused', () => {
+      const preventDefault = sandbox.spy()
       wrapperMount(<Dropdown options={options} selection />)
 
       // Note: This mousedown is necessary to get the Dropdown focused
@@ -1271,8 +1272,24 @@ describe('Dropdown', () => {
       wrapper.simulate('focus')
       dropdownMenuIsClosed()
 
-      domEvent.keyDown(document, { key: ' ' })
+      wrapper.simulate('keydown', { key: 'Spacebar', preventDefault })
       dropdownMenuIsOpen()
+      preventDefault.should.have.been.calledOnce()
+    })
+
+    it('opens on space in search input when focused', () => {
+      const preventDefault = sandbox.spy()
+      wrapperMount(<Dropdown options={options} selection search />)
+
+      // Note: This mousedown is necessary to get the Dropdown focused
+      // without it being open.
+      wrapper.simulate('mousedown')
+      wrapper.simulate('focus')
+      dropdownMenuIsClosed()
+
+      wrapper.find('input.search').simulate('keydown', { key: 'Spacebar', preventDefault })
+      dropdownMenuIsOpen()
+      preventDefault.should.have.not.been.called()
     })
 
     it('does not open on arrow down when not focused', () => {
@@ -1287,7 +1304,7 @@ describe('Dropdown', () => {
       wrapperMount(<Dropdown options={options} selection />)
       dropdownMenuIsClosed()
 
-      domEvent.keyDown(document, { key: ' ' })
+      wrapper.simulate('keydown', { key: 'Spacebar' })
       dropdownMenuIsClosed()
     })