From 9a2bbf680e3b5b98051b9f2913ab6bd31b77f79a Mon Sep 17 00:00:00 2001
From: Jeff Brown <jeffbrown@google.com>
Date: Wed, 18 Apr 2012 14:09:10 -0700
Subject: Improve handling of certain keyboard layout properties.

Automatically choose a default value for the 'number' property
based on the characters that the key can generate.

Don't generate any character when ctrl, alt or meta is
pressed unless the behavior exactly matches the modifier keys
that are pressed.

Simplified the basic keyboard layouts taking into account the
new features.

Bug: 6110399
Change-Id: Ibc0f0b50c2dcf3f962a33ac77c24d2993b77637d
---
 libs/androidfw/KeyCharacterMap.cpp | 70 +++++++++++++++++++++++++++++++++-----
 1 file changed, 62 insertions(+), 8 deletions(-)

(limited to 'libs/androidfw/KeyCharacterMap.cpp')

diff --git a/libs/androidfw/KeyCharacterMap.cpp b/libs/androidfw/KeyCharacterMap.cpp
index c8f94390e4bf..2dc7507f352d 100644
--- a/libs/androidfw/KeyCharacterMap.cpp
+++ b/libs/androidfw/KeyCharacterMap.cpp
@@ -372,7 +372,7 @@ bool KeyCharacterMap::getKeyBehavior(int32_t keyCode, int32_t metaState,
     if (getKey(keyCode, &key)) {
         const Behavior* behavior = key->firstBehavior;
         while (behavior) {
-            if ((behavior->metaState & metaState) == behavior->metaState) {
+            if (matchesMetaState(metaState, behavior->metaState)) {
                 *outKey = key;
                 *outBehavior = behavior;
                 return true;
@@ -383,6 +383,37 @@ bool KeyCharacterMap::getKeyBehavior(int32_t keyCode, int32_t metaState,
     return false;
 }
 
+bool KeyCharacterMap::matchesMetaState(int32_t eventMetaState, int32_t behaviorMetaState) {
+    // Behavior must have at least the set of meta states specified.
+    // And if the key event has CTRL, ALT or META then the behavior must exactly
+    // match those, taking into account that a behavior can specify that it handles
+    // one, both or either of a left/right modifier pair.
+    if ((eventMetaState & behaviorMetaState) == behaviorMetaState) {
+        const int32_t EXACT_META_STATES =
+                AMETA_CTRL_ON | AMETA_CTRL_LEFT_ON | AMETA_CTRL_RIGHT_ON
+                | AMETA_ALT_ON | AMETA_ALT_LEFT_ON | AMETA_ALT_RIGHT_ON
+                | AMETA_META_ON | AMETA_META_LEFT_ON | AMETA_META_RIGHT_ON;
+        int32_t unmatchedMetaState = eventMetaState & ~behaviorMetaState & EXACT_META_STATES;
+        if (behaviorMetaState & AMETA_CTRL_ON) {
+            unmatchedMetaState &= ~(AMETA_CTRL_LEFT_ON | AMETA_CTRL_RIGHT_ON);
+        } else if (behaviorMetaState & (AMETA_CTRL_LEFT_ON | AMETA_CTRL_RIGHT_ON)) {
+            unmatchedMetaState &= ~AMETA_CTRL_ON;
+        }
+        if (behaviorMetaState & AMETA_ALT_ON) {
+            unmatchedMetaState &= ~(AMETA_ALT_LEFT_ON | AMETA_ALT_RIGHT_ON);
+        } else if (behaviorMetaState & (AMETA_ALT_LEFT_ON | AMETA_ALT_RIGHT_ON)) {
+            unmatchedMetaState &= ~AMETA_ALT_ON;
+        }
+        if (behaviorMetaState & AMETA_META_ON) {
+            unmatchedMetaState &= ~(AMETA_META_LEFT_ON | AMETA_META_RIGHT_ON);
+        } else if (behaviorMetaState & (AMETA_META_LEFT_ON | AMETA_META_RIGHT_ON)) {
+            unmatchedMetaState &= ~AMETA_META_ON;
+        }
+        return !unmatchedMetaState;
+    }
+    return false;
+}
+
 bool KeyCharacterMap::findKey(char16_t ch, int32_t* outKeyCode, int32_t* outMetaState) const {
     if (!ch) {
         return false;
@@ -699,12 +730,13 @@ status_t KeyCharacterMap::Parser::parse() {
         return BAD_VALUE;
     }
 
+    if (mMap->mType == KEYBOARD_TYPE_UNKNOWN) {
+        ALOGE("%s: Keyboard layout missing required keyboard 'type' declaration.",
+                mTokenizer->getLocation().string());
+        return BAD_VALUE;
+    }
+
     if (mFormat == FORMAT_BASE) {
-        if (mMap->mType == KEYBOARD_TYPE_UNKNOWN) {
-            ALOGE("%s: Base keyboard layout missing required keyboard 'type' declaration.",
-                    mTokenizer->getLocation().string());
-            return BAD_VALUE;
-        }
         if (mMap->mType == KEYBOARD_TYPE_OVERLAY) {
             ALOGE("%s: Base keyboard layout must specify a keyboard 'type' other than 'OVERLAY'.",
                     mTokenizer->getLocation().string());
@@ -840,10 +872,11 @@ status_t KeyCharacterMap::Parser::parseKey() {
 }
 
 status_t KeyCharacterMap::Parser::parseKeyProperty() {
+    Key* key = mMap->mKeys.valueFor(mKeyCode);
     String8 token = mTokenizer->nextToken(WHITESPACE_OR_PROPERTY_DELIMITER);
     if (token == "}") {
         mState = STATE_TOP;
-        return NO_ERROR;
+        return finishKey(key);
     }
 
     Vector<Property> properties;
@@ -943,7 +976,6 @@ status_t KeyCharacterMap::Parser::parseKeyProperty() {
     } while (!mTokenizer->isEol());
 
     // Add the behavior.
-    Key* key = mMap->mKeys.valueFor(mKeyCode);
     for (size_t i = 0; i < properties.size(); i++) {
         const Property& property = properties.itemAt(i);
         switch (property.property) {
@@ -992,6 +1024,28 @@ status_t KeyCharacterMap::Parser::parseKeyProperty() {
     return NO_ERROR;
 }
 
+status_t KeyCharacterMap::Parser::finishKey(Key* key) {
+    // Fill in default number property.
+    if (!key->number) {
+        char16_t digit = 0;
+        char16_t symbol = 0;
+        for (Behavior* b = key->firstBehavior; b; b = b->next) {
+            char16_t ch = b->character;
+            if (ch) {
+                if (ch >= '0' && ch <= '9') {
+                    digit = ch;
+                } else if (ch == '(' || ch == ')' || ch == '#' || ch == '*'
+                        || ch == '-' || ch == '+' || ch == ',' || ch == '.'
+                        || ch == '\'' || ch == ':' || ch == ';' || ch == '/') {
+                    symbol = ch;
+                }
+            }
+        }
+        key->number = digit ? digit : symbol;
+    }
+    return NO_ERROR;
+}
+
 status_t KeyCharacterMap::Parser::parseModifier(const String8& token, int32_t* outMetaState) {
     if (token == "base") {
         *outMetaState = 0;
-- 
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