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ElevationDrag / src / com.example.android.elevationdrag /

ElevationDragFragment.java

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/*
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 * Copyright (C) 2014 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.elevationdrag;
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import com.example.android.common.logger.Log;
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import android.graphics.Outline;
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import android.os.Bundle;
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import android.support.v4.app.Fragment;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewOutlineProvider;
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import java.util.Locale;
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public class ElevationDragFragment extends Fragment {
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    public static final String TAG = "ElevationDragFragment";
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    /* The circular outline provider */
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    private ViewOutlineProvider mOutlineProviderCircle;
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    /* The current elevation of the floating view. */
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    private float mElevation = 0;
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    /* The step in elevation when changing the Z value */
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    private int mElevationStep;
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    @Override
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    public void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        mOutlineProviderCircle = new CircleOutlineProvider();
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        mElevationStep = getResources().getDimensionPixelSize(R.dimen.elevation_step);
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    }
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    @Override
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    public View onCreateView(LayoutInflater inflater, ViewGroup container,
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            Bundle savedInstanceState) {
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        View rootView = inflater.inflate(R.layout.ztranslation, container, false);
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        /* Find the {@link View} to apply z-translation to. */
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        final View floatingShape = rootView.findViewById(R.id.circle);
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        /* Define the shape of the {@link View}'s shadow by setting one of the {@link Outline}s. */
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        floatingShape.setOutlineProvider(mOutlineProviderCircle);
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        /* Clip the {@link View} with its outline. */
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        floatingShape.setClipToOutline(true);
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        DragFrameLayout dragLayout = ((DragFrameLayout) rootView.findViewById(R.id.main_layout));
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        dragLayout.setDragFrameController(new DragFrameLayout.DragFrameLayoutController() {
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            @Override
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            public void onDragDrop(boolean captured) {
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                /* Animate the translation of the {@link View}. Note that the translation
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                 is being modified, not the elevation. */
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                floatingShape.animate()
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                        .translationZ(captured ? 50 : 0)
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                        .setDuration(100);
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                Log.d(TAG, captured ? "Drag" : "Drop");
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            }
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        });
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        dragLayout.addDragView(floatingShape);
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        /* Raise the circle in z when the "z+" button is clicked. */
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        rootView.findViewById(R.id.raise_bt).setOnClickListener(new View.OnClickListener() {
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            @Override
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            public void onClick(View v) {
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                mElevation += mElevationStep;
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                Log.d(TAG, String.format(Locale.US, "Elevation: %.1f", mElevation));
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                floatingShape.setElevation(mElevation);
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            }
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        });
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        /* Lower the circle in z when the "z-" button is clicked. */
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        rootView.findViewById(R.id.lower_bt).setOnClickListener(new View.OnClickListener() {
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            @Override
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            public void onClick(View v) {
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                mElevation -= mElevationStep;
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                // Don't allow for negative values of Z.
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                if (mElevation < 0) {
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                    mElevation = 0;
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                }
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                Log.d(TAG, String.format(Locale.US, "Elevation: %.1f", mElevation));
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                floatingShape.setElevation(mElevation);
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            }
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        });
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        return rootView;
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    }
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    /**
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     * ViewOutlineProvider which sets the outline to be an oval which fits the view bounds.
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     */
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    private class CircleOutlineProvider extends ViewOutlineProvider {
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        @Override
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        public void getOutline(View view, Outline outline) {
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            outline.setOval(0, 0, view.getWidth(), view.getHeight());
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        }
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    }
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}
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