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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.launcher2;
     18 
     19 import android.content.Context;
     20 import android.content.res.Resources;
     21 import android.graphics.Paint;
     22 import android.util.AttributeSet;
     23 import android.widget.TextView;
     24 
     25 import com.android.launcher.R;
     26 
     27 
     28 /**
     29  * Implements a DropTarget.
     30  */
     31 public class ButtonDropTarget extends TextView implements DropTarget, DragController.DragListener {
     32 
     33     protected final int mTransitionDuration;
     34 
     35     protected Launcher mLauncher;
     36     private int mBottomDragPadding;
     37     protected TextView mText;
     38     protected SearchDropTargetBar mSearchDropTargetBar;
     39 
     40     /** Whether this drop target is active for the current drag */
     41     protected boolean mActive;
     42 
     43     /** The paint applied to the drag view on hover */
     44     protected final Paint mHoverPaint = new Paint();
     45 
     46     public ButtonDropTarget(Context context, AttributeSet attrs) {
     47         this(context, attrs, 0);
     48     }
     49 
     50     public ButtonDropTarget(Context context, AttributeSet attrs, int defStyle) {
     51         super(context, attrs, defStyle);
     52 
     53         Resources r = getResources();
     54         mTransitionDuration = r.getInteger(R.integer.config_dropTargetBgTransitionDuration);
     55         mBottomDragPadding = r.getDimensionPixelSize(R.dimen.drop_target_drag_padding);
     56     }
     57 
     58     void setLauncher(Launcher launcher) {
     59         mLauncher = launcher;
     60     }
     61 
     62     public boolean acceptDrop(DragObject d) {
     63         return false;
     64     }
     65 
     66     public void setSearchDropTargetBar(SearchDropTargetBar searchDropTargetBar) {
     67         mSearchDropTargetBar = searchDropTargetBar;
     68     }
     69 
     70     public void onDrop(DragObject d) {
     71     }
     72 
     73     public void onDragEnter(DragObject d) {
     74         d.dragView.setPaint(mHoverPaint);
     75     }
     76 
     77     public void onDragOver(DragObject d) {
     78         // Do nothing
     79     }
     80 
     81     public void onDragExit(DragObject d) {
     82         d.dragView.setPaint(null);
     83     }
     84 
     85     public void onDragStart(DragSource source, Object info, int dragAction) {
     86         // Do nothing
     87     }
     88 
     89     public boolean isDropEnabled() {
     90         return mActive;
     91     }
     92 
     93     public void onDragEnd() {
     94         // Do nothing
     95     }
     96 
     97     @Override
     98     public void getHitRect(android.graphics.Rect outRect) {
     99         super.getHitRect(outRect);
    100         outRect.bottom += mBottomDragPadding;
    101     }
    102 
    103     @Override
    104     public DropTarget getDropTargetDelegate(DragObject d) {
    105         return null;
    106     }
    107 
    108     public void getLocationInDragLayer(int[] loc) {
    109         mLauncher.getDragLayer().getLocationInDragLayer(this, loc);
    110     }
    111 }
    112