From 7d3810d8337e4f030796b566a2d562fcf79b0a22 Mon Sep 17 00:00:00 2001
From: Winson Chung <winsonc@google.com>
Date: Fri, 7 Oct 2011 13:11:56 -0700
Subject: [PATCH] Changing press feedback to holographic for search buttons.
 (Bug: 5290367)

Change-Id: I50fa849abb816a98d1dbbfd9bf6611fbb87baca9
---
 res/layout-land/search_bar.xml                |  6 +-
 res/layout-port/search_bar.xml                | 10 +--
 res/layout-sw600dp/search_bar.xml             |  6 +-
 src/com/android/launcher2/BubbleTextView.java |  6 +-
 .../launcher2/HolographicImageView.java       | 50 +++++++++++++
 .../launcher2/HolographicLinearLayout.java    | 51 +++++++++++++
 .../launcher2/HolographicViewHelper.java      | 73 +++++++++++++++++++
 7 files changed, 184 insertions(+), 18 deletions(-)
 create mode 100644 src/com/android/launcher2/HolographicImageView.java
 create mode 100644 src/com/android/launcher2/HolographicLinearLayout.java
 create mode 100644 src/com/android/launcher2/HolographicViewHelper.java

diff --git a/res/layout-land/search_bar.xml b/res/layout-land/search_bar.xml
index a1c87e4b28..c606173fd6 100644
--- a/res/layout-land/search_bar.xml
+++ b/res/layout-land/search_bar.xml
@@ -20,14 +20,13 @@
     android:layout_width="@dimen/qsb_bar_height"
     android:layout_height="match_parent">
    <!-- Global search icon -->
-   <ImageView
+   <com.android.launcher2.HolographicImageView
         style="@style/SearchButton"
         android:id="@+id/search_button"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:src="@drawable/ic_home_search_normal_holo"
         android:adjustViewBounds="true"
-        android:background="?android:attr/selectableItemBackground"
         android:onClick="onClickSearchButton"
         android:focusable="true"
         android:clickable="true"
@@ -42,14 +41,13 @@
         android:clickable="true" />
 
     <!-- Voice search icon -->
-    <ImageView
+    <com.android.launcher2.HolographicImageView
         style="@style/SearchButton"
         android:id="@+id/voice_button"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:src="@drawable/ic_home_voice_search_holo"
         android:adjustViewBounds="true"
-        android:background="?android:attr/selectableItemBackground"
         android:onClick="onClickVoiceButton"
         android:focusable="true"
         android:clickable="true"
diff --git a/res/layout-port/search_bar.xml b/res/layout-port/search_bar.xml
index 6b2c827946..5c20ec08e1 100644
--- a/res/layout-port/search_bar.xml
+++ b/res/layout-port/search_bar.xml
@@ -22,7 +22,7 @@
     android:layout_gravity="bottom|center_horizontal"
     android:background="@drawable/search_frame">
    <!-- Global search icon -->
-   <LinearLayout
+   <com.android.launcher2.HolographicLinearLayout
         style="@style/SearchButton"
         android:id="@+id/search_button_container"
         android:layout_width="match_parent"
@@ -30,7 +30,6 @@
         android:layout_alignParentLeft="true"
         android:layout_alignParentTop="true"
         android:layout_toLeftOf="@+id/voice_button_container"
-        android:background="?android:attr/selectableItemBackground"
         android:onClick="onClickSearchButton"
         android:focusable="true"
         android:clickable="true"
@@ -41,10 +40,10 @@
             android:layout_height="match_parent"
             android:src="@drawable/ic_home_search_normal_holo"
             android:adjustViewBounds="true" />
-    </LinearLayout>
+    </com.android.launcher2.HolographicLinearLayout>
 
     <!-- Voice search icon -->
-    <LinearLayout
+    <com.android.launcher2.HolographicLinearLayout
         style="@style/SearchButton.Voice"
         android:id="@+id/voice_button_container"
         android:layout_width="@dimen/search_bar_height"
@@ -52,7 +51,6 @@
         android:layout_alignParentRight="true"
         android:layout_alignParentTop="true"
         android:gravity="right"
-        android:background="?android:attr/selectableItemBackground"
         android:onClick="onClickVoiceButton"
         android:focusable="true"
         android:clickable="true"
@@ -63,5 +61,5 @@
             android:layout_height="match_parent"
             android:src="@drawable/ic_home_voice_search_holo"
             android:adjustViewBounds="true" />
-    </LinearLayout>
+    </com.android.launcher2.HolographicLinearLayout>
 </RelativeLayout>
diff --git a/res/layout-sw600dp/search_bar.xml b/res/layout-sw600dp/search_bar.xml
index f8b950c59d..d8975b4403 100644
--- a/res/layout-sw600dp/search_bar.xml
+++ b/res/layout-sw600dp/search_bar.xml
@@ -20,7 +20,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
    <!-- Global search icon -->
-   <ImageView
+   <com.android.launcher2.HolographicImageView
         style="@style/SearchButton"
         android:id="@+id/search_button"
         android:layout_width="wrap_content"
@@ -28,7 +28,6 @@
         android:layout_alignParentLeft="true"
         android:layout_alignParentTop="true"
         android:src="@drawable/ic_home_search_normal_holo"
-        android:background="?android:attr/selectableItemBackground"
         android:onClick="onClickSearchButton"
         android:focusable="true"
         android:clickable="true"
@@ -44,14 +43,13 @@
         android:clickable="true" />
 
     <!-- Voice search icon -->
-    <ImageView
+    <com.android.launcher2.HolographicImageView
         style="@style/SearchButton"
         android:id="@+id/voice_button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_toRightOf="@+id/search_divider"
         android:src="@drawable/ic_home_voice_search_holo"
-        android:background="?android:attr/selectableItemBackground"
         android:onClick="onClickVoiceButton"
         android:focusable="true"
         android:clickable="true"
diff --git a/src/com/android/launcher2/BubbleTextView.java b/src/com/android/launcher2/BubbleTextView.java
index 51fdc2eb6e..49c47cef79 100644
--- a/src/com/android/launcher2/BubbleTextView.java
+++ b/src/com/android/launcher2/BubbleTextView.java
@@ -90,10 +90,8 @@ public class BubbleTextView extends TextView {
         mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
         mPaint.setColor(bubbleColor);
         mBubbleColorAlpha = Color.alpha(bubbleColor) / 255.0f;
-        mFocusedOutlineColor = res.getColor(android.R.color.holo_blue_light);
-        mFocusedGlowColor = res.getColor(android.R.color.holo_blue_light);
-        mPressedOutlineColor = res.getColor(android.R.color.holo_blue_light);
-        mPressedGlowColor = res.getColor(android.R.color.holo_blue_light);
+        mFocusedOutlineColor = mFocusedGlowColor = mPressedOutlineColor = mPressedGlowColor =
+            res.getColor(android.R.color.holo_blue_light);
 
         setShadowLayer(SHADOW_LARGE_RADIUS, 0.0f, SHADOW_Y_OFFSET, SHADOW_LARGE_COLOUR);
     }
diff --git a/src/com/android/launcher2/HolographicImageView.java b/src/com/android/launcher2/HolographicImageView.java
new file mode 100644
index 0000000000..1d34cd6ba1
--- /dev/null
+++ b/src/com/android/launcher2/HolographicImageView.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2011 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.launcher2;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+import android.widget.ImageView;
+
+public class HolographicImageView extends ImageView {
+
+    private final HolographicViewHelper mHolographicHelper;
+
+    public HolographicImageView(Context context) {
+        this(context, null);
+    }
+
+    public HolographicImageView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public HolographicImageView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        mHolographicHelper = new HolographicViewHelper(context);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        // One time call to generate the pressed/focused state -- must be called after
+        // measure/layout
+        mHolographicHelper.generatePressedFocusedStates(this);
+    }
+}
diff --git a/src/com/android/launcher2/HolographicLinearLayout.java b/src/com/android/launcher2/HolographicLinearLayout.java
new file mode 100644
index 0000000000..986a063e5c
--- /dev/null
+++ b/src/com/android/launcher2/HolographicLinearLayout.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2011 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.launcher2;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+import android.widget.LinearLayout;
+
+public class HolographicLinearLayout extends LinearLayout {
+
+    private final HolographicViewHelper mHolographicHelper;
+
+    public HolographicLinearLayout(Context context) {
+        this(context, null);
+    }
+
+    public HolographicLinearLayout(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public HolographicLinearLayout(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+
+        setWillNotDraw(false);
+        mHolographicHelper = new HolographicViewHelper(context);
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+
+        // One time call to generate the pressed/focused state -- must be called after
+        // measure/layout
+        mHolographicHelper.generatePressedFocusedStates(this);
+    }
+}
diff --git a/src/com/android/launcher2/HolographicViewHelper.java b/src/com/android/launcher2/HolographicViewHelper.java
new file mode 100644
index 0000000000..c68a5eaadc
--- /dev/null
+++ b/src/com/android/launcher2/HolographicViewHelper.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2011 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.launcher2;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.drawable.StateListDrawable;
+import android.view.View;
+
+public class HolographicViewHelper {
+
+    private final HolographicOutlineHelper mOutlineHelper = new HolographicOutlineHelper();
+    private final Canvas mTempCanvas = new Canvas();
+
+    private boolean mStatesUpdated;
+    private int mHighlightColor;
+
+    public HolographicViewHelper(Context context) {
+        Resources res = context.getResources();
+        mHighlightColor = res.getColor(android.R.color.holo_blue_light);
+    }
+
+    /**
+     * Generate the pressed/focused states if necessary.
+     */
+    void generatePressedFocusedStates(View v) {
+        if (!mStatesUpdated) {
+            mStatesUpdated = true;
+            Bitmap outline = createGlowingOutline(v, mTempCanvas, mHighlightColor, mHighlightColor);
+            FastBitmapDrawable d = new FastBitmapDrawable(outline);
+
+            StateListDrawable states = new StateListDrawable();
+            states.addState(new int[] {android.R.attr.state_pressed}, d);
+            states.addState(new int[] {android.R.attr.state_focused}, d);
+            v.setBackgroundDrawable(states);
+        }
+    }
+
+    /**
+     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
+     * Responsibility for the bitmap is transferred to the caller.
+     */
+    private Bitmap createGlowingOutline(View v, Canvas canvas, int outlineColor, int glowColor) {
+        final int padding = HolographicOutlineHelper.MAX_OUTER_BLUR_RADIUS;
+        final Bitmap b = Bitmap.createBitmap(
+                v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
+
+        canvas.setBitmap(b);
+        canvas.save();
+            v.draw(canvas);
+        canvas.restore();
+        mOutlineHelper.applyOuterBlur(b, canvas, outlineColor);
+        canvas.setBitmap(null);
+
+        return b;
+    }
+}