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-rw-r--r--src/com/android/packageinstaller/CaffeinatedScrollView.java75
1 files changed, 75 insertions, 0 deletions
diff --git a/src/com/android/packageinstaller/CaffeinatedScrollView.java b/src/com/android/packageinstaller/CaffeinatedScrollView.java
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+++ b/src/com/android/packageinstaller/CaffeinatedScrollView.java
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+/*
+**
+** Copyright 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.packageinstaller;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.util.AttributeSet;
+import android.widget.ScrollView;
+
+/**
+ * It's a ScrollView that knows how to stay awake.
+ */
+class CaffeinatedScrollView extends ScrollView {
+ private Runnable mFullScrollAction;
+ private int mBottomSlop;
+
+ public CaffeinatedScrollView(Context context) {
+ super(context);
+ }
+
+ public CaffeinatedScrollView(Context context, AttributeSet attrs) {
+ super(context, attrs);
+ }
+
+ /**
+ * Make this visible so we can call it
+ */
+ @Override
+ public boolean awakenScrollBars() {
+ return super.awakenScrollBars();
+ }
+
+ public void setFullScrollAction(Runnable action) {
+ mFullScrollAction = action;
+ mBottomSlop = (int)(4 * getResources().getDisplayMetrics().density);
+ }
+
+ @Override
+ protected void onDraw(Canvas canvas) {
+ super.onDraw(canvas);
+ checkFullScrollAction();
+ }
+
+ @Override
+ protected void onScrollChanged(int l, int t, int oldl, int oldt) {
+ super.onScrollChanged(l, t, oldl, oldt);
+ checkFullScrollAction();
+ }
+
+ private void checkFullScrollAction() {
+ if (mFullScrollAction != null) {
+ int daBottom = getChildAt(0).getBottom();
+ int screenBottom = getScrollY() + getHeight() - getPaddingBottom();
+ if ((daBottom - screenBottom) < mBottomSlop) {
+ mFullScrollAction.run();
+ mFullScrollAction = null;
+ }
+ }
+ }
+}