1 files changed, 91 insertions, 0 deletions
diff --git a/src/com/android/swe/browser/WebViewTimersControl.java b/src/com/android/swe/browser/WebViewTimersControl.java
new file mode 100644
index 00000000..d6d17263
--- /dev/null
+++ b/src/com/android/swe/browser/WebViewTimersControl.java
@@ -0,0 +1,91 @@
+/*
+ * 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.browser;
+
+import android.os.Looper;
+import android.util.Log;
+import android.webkit.WebView;
+
+/**
+ * Centralised point for controlling WebView timers pausing and resuming.
+ *
+ * All methods on this class should only be called from the UI thread.
+ */
+public class WebViewTimersControl {
+
+    private static final boolean LOGD_ENABLED = com.android.browser.Browser.LOGD_ENABLED;
+    private static final String LOGTAG = "WebViewTimersControl";
+
+    private static WebViewTimersControl sInstance;
+
+    private boolean mBrowserActive;
+    private boolean mPrerenderActive;
+
+    /**
+     * Get the static instance. Must be called from UI thread.
+     */
+    public static WebViewTimersControl getInstance() {
+        if (Looper.myLooper() != Looper.getMainLooper()) {
+            throw new IllegalStateException("WebViewTimersControl.get() called on wrong thread");
+        }
+        if (sInstance == null) {
+            sInstance = new WebViewTimersControl();
+        }
+        return sInstance;
+    }
+
+    private WebViewTimersControl() {
+    }
+
+    private void resumeTimers(WebView wv) {
+        if (LOGD_ENABLED) Log.d(LOGTAG, "Resuming webview timers, view=" + wv);
+        if (wv != null) {
+            wv.resumeTimers();
+        }
+    }
+
+    private void maybePauseTimers(WebView wv) {
+        if (!mBrowserActive && !mPrerenderActive && wv != null) {
+            if (LOGD_ENABLED) Log.d(LOGTAG, "Pausing webview timers, view=" + wv);
+            wv.pauseTimers();
+        }
+    }
+
+    public void onBrowserActivityResume(WebView wv) {
+        if (LOGD_ENABLED) Log.d(LOGTAG, "onBrowserActivityResume");
+        mBrowserActive = true;
+        resumeTimers(wv);
+    }
+
+    public void onBrowserActivityPause(WebView wv) {
+        if (LOGD_ENABLED) Log.d(LOGTAG, "onBrowserActivityPause");
+        mBrowserActive = false;
+        maybePauseTimers(wv);
+    }
+
+    public void onPrerenderStart(WebView wv) {
+        if (LOGD_ENABLED) Log.d(LOGTAG, "onPrerenderStart");
+        mPrerenderActive = true;
+        resumeTimers(wv);
+    }
+
+    public void onPrerenderDone(WebView wv) {
+        if (LOGD_ENABLED) Log.d(LOGTAG, "onPrerenderDone");
+        mPrerenderActive = false;
+        maybePauseTimers(wv);
+    }
+
+}