Handle a shift key.

- Add a symbol shift keylayout.
- Apply a shifted state (upper case) on the next key input.

Bug: 132636760
Test: test manually.
Change-Id: I7447b9df47a953dad7216977e0b75ab801d863e4

samples/MultiClientInputMethod/res/xml/symbols_shift.xml

@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2019 The Android Open Source Project
+
+     Licensed under the Apache License, Version 2.0 (the "License");
+     you may not use this file except in compliance with the License.
+     You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+     Unless required by applicable law or agreed to in writing, software
+     distributed under the License is distributed on an "AS IS" BASIS,
+     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     See the License for the specific language governing permissions and
+     limitations under the License.
+-->
+
+
+<Keyboard xmlns:android="http://schemas.android.com/apk/res/android"
+    android:keyWidth="10%p"
+    android:horizontalGap="0px"
+    android:verticalGap="0px"
+    android:keyHeight="50dip"
+    >
+
+    <Row>
+        <Key android:codes="126" android:keyLabel="~" android:keyEdgeFlags="left"/>
+        <Key android:codes="177" android:keyLabel="±"/>
+        <Key android:codes="215" android:keyLabel="×"/>
+        <Key android:codes="247" android:keyLabel="÷"/>
+        <Key android:codes="8226" android:keyLabel="•"/>
+        <Key android:codes="176" android:keyLabel="°"/>
+        <Key android:codes="96" android:keyLabel="`"/>
+        <Key android:codes="180" android:keyLabel="´"/>
+        <Key android:codes="123" android:keyLabel="{"/>
+        <Key android:codes="125" android:keyLabel="}" android:keyEdgeFlags="right"/>
+    </Row>
+
+    <Row>
+        <Key android:codes="169" android:keyLabel="©" android:keyEdgeFlags="left"/>
+        <Key android:codes="163" android:keyLabel="£"/>
+        <Key android:codes="8364" android:keyLabel="€"/>
+        <Key android:codes="94" android:keyLabel="^"/>
+        <Key android:codes="174" android:keyLabel="®"/>
+        <Key android:codes="165" android:keyLabel="¥"/>
+        <Key android:codes="95" android:keyLabel="_"/>
+        <Key android:codes="43" android:keyLabel="+"/>
+        <Key android:codes="91" android:keyLabel="["/>
+        <Key android:codes="93" android:keyLabel="]" android:keyEdgeFlags="right"/>
+    </Row>
+
+    <Row>
+        <Key android:codes="-1" android:keyIcon="@drawable/sym_keyboard_shift"
+                android:keyWidth="15%p" android:isModifier="true"
+                android:isSticky="true" android:keyEdgeFlags="left"/>
+        <Key android:codes="161" android:keyLabel="¡" />
+        <Key android:codes="60" android:keyLabel="&lt;"/>
+        <Key android:codes="62" android:keyLabel="&gt;"/>
+        <Key android:codes="162" android:keyLabel="¢"/>
+        <Key android:codes="124" android:keyLabel="|"/>
+        <Key android:codes="92" android:keyLabel="\\" />
+        <Key android:codes="191" android:keyLabel="¿"/>
+        <Key android:codes="-5" android:keyIcon="@drawable/sym_keyboard_delete"
+                android:keyWidth="15%p" android:keyEdgeFlags="right"
+                android:isRepeatable="true"/>
+    </Row>
+
+    <Row android:rowEdgeFlags="bottom">
+        <Key android:codes="-3" android:keyIcon="@drawable/sym_keyboard_done"
+                android:keyWidth="15%p" android:keyEdgeFlags="left"/>
+        <Key android:codes="-2" android:keyLabel="ABC" android:keyWidth="10%p"/>
+        <Key android:codes="32" android:keyIcon="@drawable/sym_keyboard_space"
+                android:keyWidth="40%p" android:isRepeatable="true"/>
+        <Key android:codes="46,44" android:keyLabel=". ,"
+                android:keyWidth="15%p"/>
+        <Key android:codes="10" android:keyIcon="@drawable/sym_keyboard_return"
+                android:keyWidth="20%p" android:keyEdgeFlags="right"/>
+    </Row>
+</Keyboard>

samples/MultiClientInputMethod/src/com/example/android/multiclientinputmethod/SoftInputWindow.java

@@ -40,6 +40,7 @@ final class SoftInputWindow extends Dialog {
 
     private final Keyboard mQwertygKeyboard;
     private final Keyboard mSymbolKeyboard;
+    private final Keyboard mSymbolShiftKeyboard;
 
     private int mClientId = MultiClientInputMethodServiceDelegate.INVALID_CLIENT_ID;
     private int mTargetWindowHandle = MultiClientInputMethodServiceDelegate.INVALID_WINDOW_HANDLE;
@@ -74,6 +75,7 @@ final class SoftInputWindow extends Dialog {
         mKeyboardView = (KeyboardView) getLayoutInflater().inflate(R.layout.input, null);
         mQwertygKeyboard = new Keyboard(context, R.xml.qwerty);
         mSymbolKeyboard = new Keyboard(context, R.xml.symbols);
+        mSymbolShiftKeyboard = new Keyboard(context, R.xml.symbols_shift);
         mKeyboardView.setKeyboard(mQwertygKeyboard);
         mKeyboardView.setOnKeyboardActionListener(sNoopListener);
         layout.addView(mKeyboardView);
@@ -93,10 +95,15 @@ final class SoftInputWindow extends Dialog {
         return mTargetWindowHandle;
     }
 
-    boolean isQwerty() {
+    boolean isQwertyKeyboard() {
         return mKeyboardView.getKeyboard() == mQwertygKeyboard;
     }
 
+    boolean isSymbolKeyboard() {
+        Keyboard keyboard = mKeyboardView.getKeyboard();
+        return keyboard == mSymbolKeyboard || keyboard == mSymbolShiftKeyboard;
+    }
+
     void onFinishClient() {
         mKeyboardView.setOnKeyboardActionListener(sNoopListener);
         mClientId = MultiClientInputMethodServiceDelegate.INVALID_CLIENT_ID;
@@ -127,6 +134,8 @@ final class SoftInputWindow extends Dialog {
                     Log.v(TAG, "onKey clientId=" + clientId + " primaryCode=" + primaryCode
                             + " keyCodes=" + Arrays.toString(keyCodes));
                 }
+                boolean isShifted = isShifted();  // Store the current state before resetting it.
+                resetShift();
                 switch (primaryCode) {
                     case Keyboard.KEYCODE_CANCEL:
                         hide();
@@ -140,8 +149,11 @@ final class SoftInputWindow extends Dialog {
                     case Keyboard.KEYCODE_MODE_CHANGE:
                         handleSwitchKeyboard();
                         break;
+                    case Keyboard.KEYCODE_SHIFT:
+                        handleShift(isShifted);
+                        break;
                     default:
-                        inputConnection.commitText(String.valueOf((char) primaryCode), 1);
+                        handleCharacter(inputConnection, primaryCode, isShifted);
                         break;
                 }
             }
@@ -160,11 +172,36 @@ final class SoftInputWindow extends Dialog {
     }
 
     void handleSwitchKeyboard() {
-        if (isQwerty()) {
+        if (isQwertyKeyboard()) {
             mKeyboardView.setKeyboard(mSymbolKeyboard);
         } else {
             mKeyboardView.setKeyboard(mQwertygKeyboard);
         }
 
     }
+
+    boolean isShifted() {
+        return mKeyboardView.isShifted();
+    }
+
+    void resetShift() {
+        if (isSymbolKeyboard() && isShifted()) {
+            mKeyboardView.setKeyboard(mSymbolKeyboard);
+        }
+        mKeyboardView.setShifted(false);
+    }
+
+    void handleShift(boolean isShifted) {
+        if (isSymbolKeyboard()) {
+            mKeyboardView.setKeyboard(isShifted ? mSymbolKeyboard : mSymbolShiftKeyboard);
+        }
+        mKeyboardView.setShifted(!isShifted);
+    }
+
+    void handleCharacter(InputConnection inputConnection, int primaryCode, boolean isShifted) {
+        if (isQwertyKeyboard() && isShifted) {
+            primaryCode = Character.toUpperCase(primaryCode);
+        }
+        inputConnection.commitText(String.valueOf((char) primaryCode), 1);
+    }
 }