added spring loaded mode for adding items to workspace

Change-Id: Ie92294fe2b1d6697d84756a2fcea91a09f72825b

1 files changed, 58 insertions, 0 deletions

diff --git a/src/com/android/launcher2/SpringLoadedDragController.java b/src/com/android/launcher2/SpringLoadedDragController.java
new file mode 100644
index 000000000..a734258f9
--- /dev/null
+++ b/src/com/android/launcher2/SpringLoadedDragController.java
@@ -0,0 +1,58 @@
+/*
+ * 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.launcher2;
+
+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 = 1000;
+    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 onDragEnter(CellLayout cl) {
+        mScreen = cl;
+        mAlarm.setAlarm(ENTER_SPRING_LOAD_HOVER_TIME);
+    }
+
+    public void onDragExit() {
+        if (mScreen != null) {
+            mScreen.onDragExit();
+        }
+        mScreen = null;
+        mAlarm.setAlarm(EXIT_SPRING_LOAD_HOVER_TIME);
+    }
+
+    // this is called when our timer runs out
+    public void onAlarm(Alarm alarm) {
+        if (mScreen != null) {
+            // we're currently hovering over a screen
+            mLauncher.enterSpringLoadedDragMode(mScreen);
+        } else {
+            mLauncher.exitSpringLoadedDragMode();
+        }
+    }
+}