src/com/android/launcher2/ButtonDropTarget.java

/*
 * 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.content.res.Resources;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.FrameLayout;

import com.android.launcher.R;


/**
 * Implements a DropTarget.
 */
public class ButtonDropTarget extends FrameLayout implements DropTarget, DragController.DragListener {

    protected final int mTransitionDuration;

    protected Launcher mLauncher;
    private int mBottomDragPadding;

    /** Whether this drop target is active for the current drag */
    protected boolean mActive;

    /** The paint applied to the drag view on hover */
    protected final Paint mHoverPaint = new Paint();

    public ButtonDropTarget(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public ButtonDropTarget(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        Resources r = getResources();
        mTransitionDuration = r.getInteger(R.integer.config_dropTargetBgTransitionDuration);
        mBottomDragPadding = r.getDimensionPixelSize(R.dimen.drop_target_drag_padding);
    }

    void setLauncher(Launcher launcher) {
        mLauncher = launcher;
    }

    public boolean acceptDrop(DragObject d) {
        return false;
    }

    public void onDrop(DragObject d) {
        // Do nothing
    }

    public void onDragEnter(DragObject d) {
        d.dragView.setPaint(mHoverPaint);
    }

    public void onDragOver(DragObject d) {
        // Do nothing
    }

    public void onDragExit(DragObject d) {
        d.dragView.setPaint(null);
    }

    public void onDragStart(DragSource source, Object info, int dragAction) {
        // Do nothing
    }

    public boolean isDropEnabled() {
        return mActive;
    }

    public void onDragEnd() {
        // Do nothing
    }

    @Override
    public void getHitRect(android.graphics.Rect outRect) {
        super.getHitRect(outRect);
        outRect.bottom += mBottomDragPadding;
    }

    @Override
    public DropTarget getDropTargetDelegate(DragObject d) {
        return null;
    }

    public void getLocationInDragLayer(int[] loc) {
        mLauncher.getDragLayer().getLocationInDragLayer(this, loc);
    }
}