From c596830d10c48f45025a56edd4bec11e78532237 Mon Sep 17 00:00:00 2001
From: Clark Scheff <clark@cyngn.com>
Date: Tue, 10 Jun 2014 15:01:34 -0700
Subject: Handle theme changes

Change-Id: I85208f3d6b572fb7a161db79cd3b74c1102dbba2
(cherry picked from commit 50f78e36b079bbe14bcb50064d28940358d42544)
---
 AndroidManifest.xml                                |  6 ++
 .../android/launcher3/ThemeChangedReceiver.java    | 78 ++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 src/com/android/launcher3/ThemeChangedReceiver.java

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 4965c0c8e..40ee2e11c 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -219,6 +219,12 @@
             </intent-filter>
         </receiver>
 
+        <receiver android:name="com.android.launcher3.ThemeChangedReceiver" >
+            <intent-filter>
+                <action android:name="org.cyanogenmod.intent.action.THEME_CHANGED"/>
+            </intent-filter>
+        </receiver>
+
         <!-- The settings provider contains Home's data, like the workspace favorites -->
         <provider
             android:name="com.android.launcher3.LauncherProvider"
diff --git a/src/com/android/launcher3/ThemeChangedReceiver.java b/src/com/android/launcher3/ThemeChangedReceiver.java
new file mode 100644
index 000000000..12c9ef755
--- /dev/null
+++ b/src/com/android/launcher3/ThemeChangedReceiver.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2015 The CyanogenMod 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.launcher3;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+
+import static com.android.launcher3.WidgetPreviewLoader.CacheDb.DB_NAME;
+
+import java.io.File;
+import java.util.ArrayList;
+
+public class ThemeChangedReceiver extends BroadcastReceiver {
+    private static final String EXTRA_COMPONENTS = "components";
+
+    public static final String MODIFIES_ICONS = "mods_icons";
+    public static final String MODIFIES_FONTS = "mods_fonts";
+    public static final String MODIFIES_OVERLAYS = "mods_overlays";
+
+    public void onReceive(Context context, Intent intent) {
+        // components is a string array of the components that changed
+        ArrayList<String> components = intent.getStringArrayListExtra(EXTRA_COMPONENTS);
+        if (isInterestingThemeChange(components)) {
+            LauncherAppState app = LauncherAppState.getInstance();
+            app.getIconCache().flush();
+            clearWidgetPreviewCache(context);
+            app.recreateWidgetPreviewDb();
+            app.getModel().forceReload();
+        }
+    }
+
+    /**
+     * We consider this an "interesting" theme change if it modifies icons, overlays, or fonts.
+     * @param components
+     * @return
+     */
+    private boolean isInterestingThemeChange(ArrayList<String> components) {
+        if (components != null) {
+            for (String component : components) {
+                if (component.equals(MODIFIES_ICONS) ||
+                        component.equals(MODIFIES_FONTS) ||
+                        component.equals(MODIFIES_OVERLAYS)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Normally we could use context.deleteDatabase() but this db is in cache/ so we'll
+     * manually delete it and the journal ourselves.
+     *
+     * @param context
+     */
+    private void clearWidgetPreviewCache(Context context) {
+        File[] files = context.getCacheDir().listFiles();
+        if (files != null) {
+            for (File f : files) {
+                if (!f.isDirectory() && f.getName().startsWith(DB_NAME)) f.delete();
+            }
+        }
+    }
+}
-- 
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