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-rw-r--r--src/com/android/launcher3/SpringLoadedDragController.java62
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diff --git a/src/com/android/launcher3/SpringLoadedDragController.java b/src/com/android/launcher3/SpringLoadedDragController.java
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+++ b/src/com/android/launcher3/SpringLoadedDragController.java
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+/*
+ * Copyright (C) 2010 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.launcher3;
+
+public class SpringLoadedDragController implements OnAlarmListener {
+ // how long the user must hover over a mini-screen before it unshrinks
+ final long ENTER_SPRING_LOAD_HOVER_TIME = 500;
+ final long ENTER_SPRING_LOAD_CANCEL_HOVER_TIME = 950;
+ final long EXIT_SPRING_LOAD_HOVER_TIME = 200;
+
+ Alarm mAlarm;
+
+ // the screen the user is currently hovering over, if any
+ private CellLayout mScreen;
+ private Launcher mLauncher;
+
+ public SpringLoadedDragController(Launcher launcher) {
+ mLauncher = launcher;
+ mAlarm = new Alarm();
+ mAlarm.setOnAlarmListener(this);
+ }
+
+ public void cancel() {
+ mAlarm.cancelAlarm();
+ }
+
+ // Set a new alarm to expire for the screen that we are hovering over now
+ public void setAlarm(CellLayout cl) {
+ mAlarm.cancelAlarm();
+ mAlarm.setAlarm((cl == null) ? ENTER_SPRING_LOAD_CANCEL_HOVER_TIME :
+ ENTER_SPRING_LOAD_HOVER_TIME);
+ mScreen = cl;
+ }
+
+ // this is called when our timer runs out
+ public void onAlarm(Alarm alarm) {
+ if (mScreen != null) {
+ // Snap to the screen that we are hovering over now
+ Workspace w = mLauncher.getWorkspace();
+ int page = w.indexOfChild(mScreen);
+ if (page != w.getCurrentPage()) {
+ w.snapToPage(page);
+ }
+ } else {
+ mLauncher.getDragController().cancelDrag();
+ }
+ }
+}