Calculate mini keyboard key width from labels

Change-Id: I4259753bd10fdf488fcffacb6b131e30511e780f

1 files changed, 39 insertions, 7 deletions

diff --git a/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java b/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java
index 33d19602d..458a9eed4 100644
--- a/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java
+++ b/java/src/com/android/inputmethod/keyboard/MiniKeyboardBuilder.java
@@ -16,8 +16,12 @@
 
 package com.android.inputmethod.keyboard;
 
+import com.android.inputmethod.latin.R;
+
 import android.content.Context;
 import android.content.res.Resources;
+import android.graphics.Paint;
+import android.graphics.Rect;
 
 import java.util.List;
 
@@ -25,6 +29,8 @@ public class MiniKeyboardBuilder {
     private final Resources mRes;
     private final Keyboard mKeyboard;
     private final CharSequence[] mPopupCharacters;
+    private final int mMiniKeyboardKeyHorizontalPadding;
+    private final int mKeyWidth;
     private final int mMaxColumns;
     private final int mNumRows;
     private int mColPos;
@@ -32,35 +38,61 @@ public class MiniKeyboardBuilder {
     private int mX;
     private int mY;
 
-    public MiniKeyboardBuilder(Context context, int layoutTemplateResId, Key popupKey) {
+    public MiniKeyboardBuilder(KeyboardView view, int layoutTemplateResId, Key popupKey) {
+        final Context context = view.getContext();
         mRes = context.getResources();
         final Keyboard keyboard = new Keyboard(context, layoutTemplateResId, null);
         mKeyboard = keyboard;
         mPopupCharacters = popupKey.mPopupCharacters;
-        final int numKeys = mPopupCharacters.length;
+        mMiniKeyboardKeyHorizontalPadding = (int)mRes.getDimension(
+                R.dimen.mini_keyboard_key_horizontal_padding);
+        mKeyWidth = getMaxKeyWidth(view, mPopupCharacters, mKeyboard.getKeyWidth());
         final int maxColumns = popupKey.mMaxPopupColumn;
+        mMaxColumns = maxColumns;
+        final int numKeys = mPopupCharacters.length;
         int numRows = numKeys / maxColumns;
         if (numKeys % maxColumns != 0) numRows++;
-        mMaxColumns = maxColumns;
         mNumRows = numRows;
         keyboard.setHeight((keyboard.getRowHeight() + keyboard.getVerticalGap()) * numRows
                 - keyboard.getVerticalGap());
-        // TODO: To determine key width we should pay attention to key label length.
         if (numRows > 1) {
             mColPos = numKeys % maxColumns;
             if (mColPos > 0) mColPos = maxColumns - mColPos;
             // Centering top-row keys.
-            mX = mColPos * (keyboard.getKeyWidth() + keyboard.getHorizontalGap()) / 2;
+            mX = mColPos * (mKeyWidth + keyboard.getHorizontalGap()) / 2;
         }
         mKeyboard.setMinWidth(0);
     }
 
+    private int getMaxKeyWidth(KeyboardView view, CharSequence[] popupCharacters, int minKeyWidth) {
+        Paint paint = null;
+        Rect bounds = null;
+        int maxWidth = 0;
+        for (CharSequence popupSpec : popupCharacters) {
+            final CharSequence label = PopupCharactersParser.getLabel(popupSpec.toString());
+            // If the label is single letter, minKeyWidth is enough to hold the label.
+            if (label.length() > 1) {
+                if (paint == null) {
+                    paint = new Paint();
+                    paint.setAntiAlias(true);
+                }
+                final int labelSize = view.getLabelSizeAndSetPaint(label, 0, paint);
+                paint.setTextSize(labelSize);
+                if (bounds == null) bounds = new Rect();
+                paint.getTextBounds(label.toString(), 0, label.length(), bounds);
+                if (maxWidth < bounds.width())
+                    maxWidth = bounds.width();
+            }
+        }
+        return Math.max(minKeyWidth, maxWidth + mMiniKeyboardKeyHorizontalPadding);
+    }
+
     public Keyboard build() {
         final Keyboard keyboard = mKeyboard;
         final List<Key> keys = keyboard.getKeys();
         for (CharSequence label : mPopupCharacters) {
             refresh();
-            final Key key = new Key(mRes, keyboard, label, mX, mY, getRowFlags());
+            final Key key = new Key(mRes, keyboard, label, mX, mY, mKeyWidth, getRowFlags());
             keys.add(key);
             advance();
         }
@@ -89,7 +121,7 @@ public class MiniKeyboardBuilder {
     private void advance() {
         final Keyboard keyboard = mKeyboard;
         // TODO: Allocate key position depending the precedence of popup characters.
-        mX += keyboard.getKeyWidth() + keyboard.getHorizontalGap();
+        mX += mKeyWidth + keyboard.getHorizontalGap();
         if (mX > keyboard.getMinWidth())
             keyboard.setMinWidth(mX);
         mColPos++;