Implement button to get application info for an app shortcut.

For now, it's just a drag target like the delete zone. Once all apps
and the home screen support a selection mode, this (and delete) will
be implemented as buttons in the Contextual Action Bar.

Change-Id: I6bf43d03eefda672ea34c583a7021137da22b184

4 files changed, 183 insertions, 14 deletions

diff --git a/src/com/android/launcher2/ApplicationInfoDropTarget.java b/src/com/android/launcher2/ApplicationInfoDropTarget.java
new file mode 100644
index 000000000..737d19841
--- /dev/null
+++ b/src/com/android/launcher2/ApplicationInfoDropTarget.java
@@ -0,0 +1,143 @@
+/*
+ * 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;
+
+import android.content.Context;
+import android.graphics.Paint;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffColorFilter;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.ImageView;
+
+/**
+ * Implements a DropTarget which allows applications to be dropped on it,
+ * in order to launch the application info for that app.
+ */
+public class ApplicationInfoDropTarget extends ImageView implements DropTarget, DragController.DragListener {
+    private Launcher mLauncher;
+    private DragController mDragController;
+    private boolean mActive = false;
+
+    private View mHandle;
+
+    private final Paint mPaint = new Paint();
+
+    public ApplicationInfoDropTarget(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public ApplicationInfoDropTarget(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+    }
+
+    /**
+     * Set the color that will be used as a filter over objects dragged over this object.
+     */
+    public void setDragColor(int color) {
+        mPaint.setColorFilter(new PorterDuffColorFilter(color, PorterDuff.Mode.SRC_ATOP));
+    }
+
+    public boolean acceptDrop(DragSource source, int x, int y, int xOffset, int yOffset,
+            DragView dragView, Object dragInfo) {
+
+        // acceptDrop is called just before onDrop. We do the work here, rather than
+        // in onDrop, because it allows us to reject the drop (by returning false)
+        // so that the object being dragged isn't removed from the home screen.
+
+        String packageName = null;
+        if (dragInfo instanceof ApplicationInfo) {
+            packageName = ((ApplicationInfo)dragInfo).componentName.getPackageName();
+        } else if (dragInfo instanceof ShortcutInfo) {
+            packageName = ((ShortcutInfo)dragInfo).intent.getComponent().getPackageName();
+        }
+        mLauncher.startApplicationDetailsActivity(packageName);
+        return false;
+    }
+
+    public Rect estimateDropLocation(DragSource source, int x, int y, int xOffset, int yOffset,
+            DragView dragView, Object dragInfo, Rect recycle) {
+        return null;
+    }
+
+    public void onDrop(DragSource source, int x, int y, int xOffset, int yOffset,
+            DragView dragView, Object dragInfo) {
+
+    }
+
+    public void onDragEnter(DragSource source, int x, int y, int xOffset, int yOffset,
+            DragView dragView, Object dragInfo) {
+        dragView.setPaint(mPaint);
+    }
+
+    public void onDragOver(DragSource source, int x, int y, int xOffset, int yOffset,
+            DragView dragView, Object dragInfo) {
+    }
+
+    public void onDragExit(DragSource source, int x, int y, int xOffset, int yOffset,
+            DragView dragView, Object dragInfo) {
+        // TODO: Animate out
+        dragView.setPaint(null);
+    }
+
+    public void onDragStart(DragSource source, Object info, int dragAction) {
+        if (info != null) {
+            mActive = true;
+
+            // TODO: Animate these in and out
+
+            // Only show the info icon when an application is selected
+            if (((ItemInfo)info).itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION) {
+                setVisibility(VISIBLE);
+            }
+            mHandle.setVisibility(INVISIBLE);
+        }
+    }
+
+    public void onDragEnd() {
+        if (mActive) {
+            mActive = false;
+            // TODO: Animate these in and out
+            setVisibility(GONE);
+            mHandle.setVisibility(VISIBLE);
+        }
+    }
+
+    void setLauncher(Launcher launcher) {
+        mLauncher = launcher;
+    }
+
+    void setDragController(DragController dragController) {
+        mDragController = dragController;
+    }
+
+    void setHandle(View view) {
+        mHandle = view;
+    }
+
+    @Override
+    public DropTarget getDropTargetDelegate(DragSource source, int x, int y, int xOffset, int yOffset,
+            DragView dragView, Object dragInfo) {
+        return null;
+    }
+}
diff --git a/src/com/android/launcher2/DragController.java b/src/com/android/launcher2/DragController.java
index 0130ba93c..651b6f0b2 100644
--- a/src/com/android/launcher2/DragController.java
+++ b/src/com/android/launcher2/DragController.java
@@ -99,7 +99,7 @@ public class DragController {
     /** Who can receive drop events */
     private ArrayList<DropTarget> mDropTargets = new ArrayList<DropTarget>();
 
-    private DragListener mListener;
+    private ArrayList<DragListener> mListeners = new ArrayList<DragListener>();
 
     /** The window token used as the parent for the DragView. */
     private IBinder mWindowToken;
@@ -213,8 +213,8 @@ public class DragController {
         }
         mInputMethodManager.hideSoftInputFromWindow(mWindowToken, 0);
 
-        if (mListener != null) {
-            mListener.onDragStart(source, dragInfo, dragAction);
+        for (DragListener listener : mListeners) {
+            listener.onDragStart(source, dragInfo, dragAction);
         }
 
         int registrationX = ((int)mMotionDownX) - screenX;
@@ -297,8 +297,8 @@ public class DragController {
             if (mOriginator != null) {
                 mOriginator.setVisibility(View.VISIBLE);
             }
-            if (mListener != null) {
-                mListener.onDragEnd();
+            for (DragListener listener : mListeners) {
+                listener.onDragEnd();
             }
             if (mDragView != null) {
                 mDragView.remove();
@@ -547,15 +547,15 @@ public class DragController {
     /**
      * Sets the drag listner which will be notified when a drag starts or ends.
      */
-    public void setDragListener(DragListener l) {
-        mListener = l;
+    public void addDragListener(DragListener l) {
+        mListeners.add(l);
     }
 
     /**
      * Remove a previously installed drag listener.
      */
     public void removeDragListener(DragListener l) {
-        mListener = null;
+        mListeners.remove(l);
     }
 
     /**
diff --git a/src/com/android/launcher2/DropTarget.java b/src/com/android/launcher2/DropTarget.java
index 7e542312c..e33ec9a63 100644
--- a/src/com/android/launcher2/DropTarget.java
+++ b/src/com/android/launcher2/DropTarget.java
@@ -72,8 +72,7 @@ public interface DropTarget {
 
     /**
      * Check if a drop action can occur at, or near, the requested location.
-     * This may be called repeatedly during a drag, so any calls should return
-     * quickly.
+     * This will be called just before onDrop.
      * 
      * @param source DragSource where the drag started
      * @param x X coordinate of the drop location
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index b5d0dbb5d..ebe9baada 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -16,6 +16,9 @@
 
 package com.android.launcher2;
 
+import com.android.common.Search;
+import com.android.launcher.R;
+
 import android.animation.Animatable;
 import android.animation.AnimatableListenerAdapter;
 import android.animation.Animator;
@@ -58,6 +61,7 @@ import android.os.Parcelable;
 import android.os.SystemClock;
 import android.os.SystemProperties;
 import android.provider.LiveFolders;
+import android.provider.Settings;
 import android.text.Selection;
 import android.text.SpannableStringBuilder;
 import android.text.TextUtils;
@@ -89,8 +93,14 @@ import android.widget.TabHost.TabContentFactory;
 import android.widget.TabWidget;
 import android.widget.TextView;
 import android.widget.Toast;
-import com.android.common.Search;
-import com.android.launcher.R;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
 
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
@@ -875,20 +885,31 @@ public final class Launcher extends Activity
         deleteZone.setDragController(dragController);
         int deleteZoneHandleId;
         if (LauncherApplication.isScreenXLarge()) {
-            deleteZoneHandleId = R.id.configure_button;
+            deleteZoneHandleId = R.id.all_apps_button;
         } else {
             deleteZoneHandleId = R.id.all_apps_button_cluster;
         }
         deleteZone.setHandle(findViewById(deleteZoneHandleId));
+        dragController.addDragListener(deleteZone);
+
+        ApplicationInfoDropTarget infoButton = (ApplicationInfoDropTarget)findViewById(R.id.info_button);
+        if (infoButton != null) {
+            infoButton.setLauncher(this);
+            infoButton.setHandle(findViewById(R.id.configure_button));
+            infoButton.setDragColor(getResources().getColor(R.color.app_info_filter));
+            dragController.addDragListener(infoButton);
+        }
 
         dragController.setDragScoller(workspace);
-        dragController.setDragListener(deleteZone);
         dragController.setScrollView(dragLayer);
         dragController.setMoveTarget(workspace);
 
         // The order here is bottom to top.
         dragController.addDropTarget(workspace);
         dragController.addDropTarget(deleteZone);
+        if (infoButton != null) {
+            dragController.addDropTarget(infoButton);
+        }
     }
 
     @SuppressWarnings({"UnusedDeclaration"})
@@ -1686,6 +1707,12 @@ public final class Launcher extends Activity
         showAllApps(true);
     }
 
+    void startApplicationDetailsActivity(String packageName) {
+        Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS,
+                Uri.fromParts("package", packageName, null));
+        startActivity(intent);
+    }
+
     void startActivitySafely(Intent intent, Object tag) {
         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         try {