From 4b30212ecfe23b92b21d0304a580a421dbd6808b Mon Sep 17 00:00:00 2001
From: Jon Schectman <joschect@microsoft.com>
Date: Tue, 23 Jan 2018 13:55:24 -0800
Subject: [PATCH] BaseAutoFill: Fix a bug where BaseAutoFill would not work
 with composed languages (#3713)

* enable the base auto fill to work with composed languages like Japanese. Also made some small improvements to structure

* adding change file

* removing unecessary import

* fix lint

* Update BasePicker Snap

* Fixing comments and minor bug in firefox

* Make onchange better and update snaps

* adding in comments

* fixing comments

* small code cleanup
---
 ...utofill-fixime-input_2018-01-12-02-56.json |  11 ++
 .../__snapshots__/ComboBox.test.tsx.snap      |   2 +
 .../pickers/AutoFill/BaseAutoFill.tsx         | 130 +++++++++++++-----
 .../__snapshots__/BasePicker.test.tsx.snap    |   4 +
 4 files changed, 114 insertions(+), 33 deletions(-)
 create mode 100644 common/changes/office-ui-fabric-react/baseautofill-fixime-input_2018-01-12-02-56.json

diff --git a/common/changes/office-ui-fabric-react/baseautofill-fixime-input_2018-01-12-02-56.json b/common/changes/office-ui-fabric-react/baseautofill-fixime-input_2018-01-12-02-56.json
new file mode 100644
index 0000000000000..33b5d94c697d8
--- /dev/null
+++ b/common/changes/office-ui-fabric-react/baseautofill-fixime-input_2018-01-12-02-56.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "office-ui-fabric-react",
+      "comment": "BaseAutoFill: Fixed a bug where baseautofill would not work with composed languages like Japanese",
+      "type": "patch"
+    }
+  ],
+  "packageName": "office-ui-fabric-react",
+  "email": "joschect@microsoft.com"
+}
\ No newline at end of file
diff --git a/packages/office-ui-fabric-react/src/components/ComboBox/__snapshots__/ComboBox.test.tsx.snap b/packages/office-ui-fabric-react/src/components/ComboBox/__snapshots__/ComboBox.test.tsx.snap
index c3fb997882aee..a9e542b214e9a 100644
--- a/packages/office-ui-fabric-react/src/components/ComboBox/__snapshots__/ComboBox.test.tsx.snap
+++ b/packages/office-ui-fabric-react/src/components/ComboBox/__snapshots__/ComboBox.test.tsx.snap
@@ -106,6 +106,8 @@ exports[`ComboBox Renders ComboBox correctly 1`] = `
       onBlur={[Function]}
       onChange={[Function]}
       onClick={[Function]}
+      onCompositionEnd={[Function]}
+      onCompositionStart={[Function]}
       onFocus={[Function]}
       onKeyDown={[Function]}
       onKeyUp={[Function]}
diff --git a/packages/office-ui-fabric-react/src/components/pickers/AutoFill/BaseAutoFill.tsx b/packages/office-ui-fabric-react/src/components/pickers/AutoFill/BaseAutoFill.tsx
index 0448b991c61f9..72e5b83f51a1e 100644
--- a/packages/office-ui-fabric-react/src/components/pickers/AutoFill/BaseAutoFill.tsx
+++ b/packages/office-ui-fabric-react/src/components/pickers/AutoFill/BaseAutoFill.tsx
@@ -73,9 +73,7 @@ export class BaseAutoFill extends BaseComponent<IBaseAutoFillProps, IBaseAutoFil
       newValue = this.props.updateValueInWillReceiveProps();
     }
 
-    if (this._autoFillEnabled && this._doesTextStartWith(nextProps.suggestedDisplayValue!, newValue ? newValue : this._value)) {
-      newValue = nextProps.suggestedDisplayValue;
-    }
+    newValue = this._getDisplayValue(newValue ? newValue : this._value, nextProps.suggestedDisplayValue);
 
     if (typeof newValue === 'string') {
       this.setState({ displayValue: newValue });
@@ -118,11 +116,13 @@ export class BaseAutoFill extends BaseComponent<IBaseAutoFillProps, IBaseAutoFil
     const nativeProps = getNativeProps(this.props, inputProperties);
     return (
       <input
-        { ...nativeProps}
+        { ...nativeProps }
         ref={ this._resolveRef('_inputElement') }
         value={ displayValue }
         autoCapitalize={ 'off' }
         autoComplete={ 'off' }
+        onCompositionStart={ this._onCompositionStart }
+        onCompositionEnd={ this._onCompositionEnd }
         onChange={ this._onChange }
         onKeyDown={ this._onKeyDown }
         onClick={ this.props.onClick ? this.props.onClick : this._onClick }
@@ -141,6 +141,25 @@ export class BaseAutoFill extends BaseComponent<IBaseAutoFillProps, IBaseAutoFil
     this._inputElement.setSelectionRange(0, 0);
   }
 
+  // Composition events are used when the character/text requires several keystrokes to be completed.
+  // Some examples of this are mobile text input and langauges like Japanese or Arabic.
+  // Find out more at https://developer.mozilla.org/en-US/docs/Web/Events/compositionstart
+  @autobind
+  private _onCompositionStart(ev: React.CompositionEvent<HTMLInputElement>) {
+    this._autoFillEnabled = false;
+  }
+
+  // Composition events are used when the character/text requires several keystrokes to be completed.
+  // Some examples of this are mobile text input and langauges like Japanese or Arabic.
+  // Find out more at https://developer.mozilla.org/en-US/docs/Web/Events/compositionstart
+  @autobind
+  private _onCompositionEnd(ev: React.CompositionEvent<HTMLInputElement>) {
+    let inputValue = this._getCurrentInputValue();
+    this._tryEnableAutofill(inputValue, this.value, false, true);
+    // Due to timing, this needs to be async, otherwise no text will be selected.
+    this._async.setTimeout(() => this._updateValue(inputValue), 0);
+  }
+
   @autobind
   private _onClick() {
     if (this._value && this._value !== '' && this._autoFillEnabled) {
@@ -154,37 +173,66 @@ export class BaseAutoFill extends BaseComponent<IBaseAutoFillProps, IBaseAutoFil
       this.props.onKeyDown(ev);
     }
 
-    switch (ev.which) {
-      case KeyCodes.backspace:
-        this._autoFillEnabled = false;
-        break;
-      case KeyCodes.left:
-        if (this._autoFillEnabled) {
+    // If the event is actively being composed, then don't alert autofill.
+    // Right now typing does not have isComposing, once that has been fixed any should be removed.
+    if (!(ev.nativeEvent as any).isComposing) {
+      switch (ev.which) {
+        case KeyCodes.backspace:
           this._autoFillEnabled = false;
-        }
-        break;
-      case KeyCodes.right:
-        if (this._autoFillEnabled) {
-          this._autoFillEnabled = false;
-        }
-        break;
-      default:
-        if (!this._autoFillEnabled) {
-          if (this.props.enableAutoFillOnKeyPress!.indexOf(ev.which) !== -1) {
-            this._autoFillEnabled = true;
+          break;
+        case KeyCodes.left:
+        case KeyCodes.right:
+          if (this._autoFillEnabled) {
+            this._value = this.state.displayValue!;
+            this._autoFillEnabled = false;
           }
-        }
-        break;
+          break;
+        default:
+          if (!this._autoFillEnabled) {
+            if (this.props.enableAutoFillOnKeyPress!.indexOf(ev.which) !== -1) {
+              this._autoFillEnabled = true;
+            }
+          }
+          break;
+      }
     }
   }
 
   @autobind
   private _onChange(ev: React.FormEvent<HTMLElement>) {
-    let value: string = (ev.target as HTMLInputElement).value;
-    if (value && (ev.target as HTMLInputElement).selectionStart === value.length && !this._autoFillEnabled && value.length > this._value.length) {
+    let value: string = this._getCurrentInputValue(ev);
+    // Right now typing does not have isComposing, once that has been fixed any should be removed.
+    this._tryEnableAutofill(value, this._value, (ev.nativeEvent as any).isComposing);
+    this._updateValue(value);
+  }
+
+  private _getCurrentInputValue(ev?: React.FormEvent<HTMLElement>): string {
+    if (ev && ev.target && (ev.target as any).value) {
+      return (ev.target as any).value;
+    } else {
+      return this._inputElement.value;
+    }
+  }
+
+  /**
+   * Attempts to enable autofill. Whether or not autofill is enabled depends on the input value,
+   * whether or not any text is selected, and only if the new input value is longer than the old input value.
+   * Autofill should never be set to true if the value is composing. Once compositionEnd is called, then
+   * it should be completed.
+   * See https://developer.mozilla.org/en-US/docs/Web/API/CompositionEvent for more information on composition.
+   * @param newValue
+   * @param oldValue
+   * @param isComposing if true then the text is actively being composed and it has not completed.
+   * @param isComposed if the text is a composed text value.
+   */
+  private _tryEnableAutofill(newValue: string, oldValue: string, isComposing?: boolean, isComposed?: boolean) {
+    if (!isComposing
+      && newValue
+      && this._inputElement.selectionStart === newValue.length
+      && !this._autoFillEnabled
+      && (newValue.length > oldValue.length || isComposed)) {
       this._autoFillEnabled = true;
     }
-    this._updateValue(value);
   }
 
   private _notifyInputChange(newValue: string) {
@@ -193,20 +241,36 @@ export class BaseAutoFill extends BaseComponent<IBaseAutoFillProps, IBaseAutoFil
     }
   }
 
+  /**
+   * Updates the current input value as well as getting a new display value.
+   * @param newValue The new value from the input
+   */
   @autobind
   private _updateValue(newValue: string) {
     this._value = this.props.onInputChange ? this.props.onInputChange(newValue) : newValue;
-    let displayValue = newValue;
-    if (this.props.suggestedDisplayValue &&
-      this._doesTextStartWith(this.props.suggestedDisplayValue, displayValue)
-      && this._autoFillEnabled) {
-      displayValue = this.props.suggestedDisplayValue;
-    }
     this.setState({
-      displayValue: newValue
+      displayValue: this._getDisplayValue(this._value, this.props.suggestedDisplayValue)
     }, () => this._notifyInputChange(this._value));
   }
 
+  /**
+   * Returns a string that should be used as the display value.
+   * It evaluates this based on whether or not the suggested value starts with the input value
+   * and whether or not autofill is enabled.
+   * @param inputValue the value that the input currently has.
+   * @param suggestedDisplayValue the possible full value
+   */
+  private _getDisplayValue(inputValue: string, suggestedDisplayValue?: string) {
+    let displayValue = inputValue;
+    if (suggestedDisplayValue
+      && inputValue
+      && this._doesTextStartWith(suggestedDisplayValue, displayValue)
+      && this._autoFillEnabled) {
+      displayValue = suggestedDisplayValue;
+    }
+    return displayValue;
+  }
+
   private _doesTextStartWith(text: string, startWith: string) {
     if (!text || !startWith) {
       return false;
diff --git a/packages/office-ui-fabric-react/src/components/pickers/__snapshots__/BasePicker.test.tsx.snap b/packages/office-ui-fabric-react/src/components/pickers/__snapshots__/BasePicker.test.tsx.snap
index f4c1a74dea981..6df55e9308d6f 100644
--- a/packages/office-ui-fabric-react/src/components/pickers/__snapshots__/BasePicker.test.tsx.snap
+++ b/packages/office-ui-fabric-react/src/components/pickers/__snapshots__/BasePicker.test.tsx.snap
@@ -54,6 +54,8 @@ exports[`Pickers BasePicker renders BasePicker correctly 1`] = `
           disabled={undefined}
           onChange={[Function]}
           onClick={[Function]}
+          onCompositionEnd={[Function]}
+          onCompositionStart={[Function]}
           onFocus={[Function]}
           onKeyDown={[Function]}
           role="combobox"
@@ -119,6 +121,8 @@ exports[`Pickers TagPicker renders TagPicker correctly 1`] = `
           disabled={undefined}
           onChange={[Function]}
           onClick={[Function]}
+          onCompositionEnd={[Function]}
+          onCompositionStart={[Function]}
           onFocus={[Function]}
           onKeyDown={[Function]}
           role="combobox"