Make KeyDrawParams and KeyPreviewDrawParams to top level class

This is a follow up of Ide48c361.

Bug: 6509415
Change-Id: Ib45c476924bc4b6b2ca65e0cae91d719109a9cb1

1 files changed, 106 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyPreviewDrawParams.java b/java/src/com/android/inputmethod/keyboard/internal/KeyPreviewDrawParams.java
new file mode 100644
index 000000000..0d5590ec8
--- /dev/null
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyPreviewDrawParams.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2012 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.
+ */
+
+package com.android.inputmethod.keyboard.internal;
+
+import android.content.res.TypedArray;
+import android.graphics.Typeface;
+import android.graphics.drawable.Drawable;
+
+import com.android.inputmethod.latin.R;
+
+public class KeyPreviewDrawParams {
+    // XML attributes.
+    public final Drawable mPreviewBackground;
+    public final Drawable mPreviewLeftBackground;
+    public final Drawable mPreviewRightBackground;
+    public final int mPreviewTextColor;
+    public final int mPreviewOffset;
+    public final int mPreviewHeight;
+    public final Typeface mKeyTextStyle;
+    public final int mLingerTimeout;
+
+    private final float mPreviewTextRatio;
+    private final float mKeyLetterRatio;
+
+    // The graphical geometry of the key preview.
+    // <-width->
+    // +-------+   ^
+    // |       |   |
+    // |preview| height (visible)
+    // |       |   |
+    // +       + ^ v
+    //  \     /  |offset
+    // +-\   /-+ v
+    // |  +-+  |
+    // |parent |
+    // |    key|
+    // +-------+
+    // The background of a {@link TextView} being used for a key preview may have invisible
+    // paddings. To align the more keys keyboard panel's visible part with the visible part of
+    // the background, we need to record the width and height of key preview that don't include
+    // invisible paddings.
+    public int mPreviewVisibleWidth;
+    public int mPreviewVisibleHeight;
+    // The key preview may have an arbitrary offset and its background that may have a bottom
+    // padding. To align the more keys keyboard and the key preview we also need to record the
+    // offset between the top edge of parent key and the bottom of the visible part of key
+    // preview background.
+    public int mPreviewVisibleOffset;
+
+    public int mPreviewTextSize;
+    public int mKeyLetterSize;
+    public final int[] mCoordinates = new int[2];
+
+    private static final int PREVIEW_ALPHA = 240;
+
+    public KeyPreviewDrawParams(TypedArray a, KeyDrawParams keyDrawParams) {
+        mPreviewBackground = a.getDrawable(R.styleable.KeyboardView_keyPreviewBackground);
+        mPreviewLeftBackground = a.getDrawable(
+                R.styleable.KeyboardView_keyPreviewLeftBackground);
+        mPreviewRightBackground = a.getDrawable(
+                R.styleable.KeyboardView_keyPreviewRightBackground);
+        setAlpha(mPreviewBackground, PREVIEW_ALPHA);
+        setAlpha(mPreviewLeftBackground, PREVIEW_ALPHA);
+        setAlpha(mPreviewRightBackground, PREVIEW_ALPHA);
+        mPreviewOffset = a.getDimensionPixelOffset(
+                R.styleable.KeyboardView_keyPreviewOffset, 0);
+        mPreviewHeight = a.getDimensionPixelSize(
+                R.styleable.KeyboardView_keyPreviewHeight, 80);
+        mPreviewTextRatio = getRatio(a, R.styleable.KeyboardView_keyPreviewTextRatio);
+        mPreviewTextColor = a.getColor(R.styleable.KeyboardView_keyPreviewTextColor, 0);
+        mLingerTimeout = a.getInt(R.styleable.KeyboardView_keyPreviewLingerTimeout, 0);
+
+        mKeyLetterRatio = keyDrawParams.mKeyLetterRatio;
+        mKeyTextStyle = keyDrawParams.mKeyTextStyle;
+    }
+
+    public void updateKeyHeight(int keyHeight) {
+        mPreviewTextSize = (int)(keyHeight * mPreviewTextRatio);
+        mKeyLetterSize = (int)(keyHeight * mKeyLetterRatio);
+    }
+
+    private static void setAlpha(Drawable drawable, int alpha) {
+        if (drawable == null)
+            return;
+        drawable.setAlpha(alpha);
+    }
+
+    // Read fraction value in TypedArray as float.
+    private static float getRatio(TypedArray a, int index) {
+        return a.getFraction(index, 1000, 1000, 1) / 1000.0f;
+    }
+}
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