Android Open Source - subsampling-scale-image-view Advanced Event Handling Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
Copyright 2014 David Morrissey/*  w w w  .j a va  2 s . c  o  m*/

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.davemorrissey.labs.subscaleview.sample.eventhandlingadvanced;

import android.app.Activity;
import android.graphics.PointF;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.TextView;
import android.widget.Toast;
import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView;
import com.davemorrissey.labs.subscaleview.sample.R.id;
import com.davemorrissey.labs.subscaleview.sample.R.layout;

import java.util.Arrays;
import java.util.List;

public class AdvancedEventHandlingActivity extends Activity implements OnClickListener {

    private static final String BUNDLE_POSITION = "position";

    private int position;

    private List<Note> notes;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(layout.notes_activity);
        getActionBar().setTitle("Advanced event handling");
        getActionBar().setDisplayHomeAsUpEnabled(true);
        findViewById(id.next).setOnClickListener(this);
        findViewById(id.previous).setOnClickListener(this);
        if (savedInstanceState != null && savedInstanceState.containsKey(BUNDLE_POSITION)) {
            position = savedInstanceState.getInt(BUNDLE_POSITION);
        }
        notes = Arrays.asList(
                new Note("Overriding gestures", "Some gestures can be overridden with your own GestureDetector without affecting the image view. This allows you to get the coordinates of the event."),
                new Note("onSingleTapConfirmed", "onSingleTapConfirmed has been overridden. Tap the image to see coordinates."),
                new Note("onDoubleTap", "onDoubleTap has been overridden. Tap the image to see coordinates. This overrides the default zoom in behaviour."),
                new Note("onLongPress", "onLongPress has been overridden. Press and hold the image to see coordinates."),
                new Note("Other events", "You can override any event you want, but customising swipe, fling and zoom gestures will stop the view working normally.")
        );

        initialiseImage();
        updateNotes();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(BUNDLE_POSITION, position);
    }

    @Override
    public void onClick(View view) {
        if (view.getId() == id.next) {
            position++;
            updateNotes();
        } else if (view.getId() == id.previous) {
            position--;
            updateNotes();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        finish();
        return true;
    }

    private void initialiseImage() {
        final SubsamplingScaleImageView imageView = (SubsamplingScaleImageView)findViewById(id.imageView);
        final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onSingleTapConfirmed(MotionEvent e) {
                if (imageView.isImageReady()) {
                    PointF sCoord = imageView.viewToSourceCoord(e.getX(), e.getY());
                    Toast.makeText(getApplicationContext(), "Single tap: " + ((int)sCoord.x) + ", " + ((int)sCoord.y), Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getApplicationContext(), "Single tap: Image not ready", Toast.LENGTH_SHORT).show();
                }
                return true;
            }
            @Override
            public void onLongPress(MotionEvent e) {
                if (imageView.isImageReady()) {
                    PointF sCoord = imageView.viewToSourceCoord(e.getX(), e.getY());
                    Toast.makeText(getApplicationContext(), "Long press: " + ((int)sCoord.x) + ", " + ((int)sCoord.y), Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getApplicationContext(), "Long press: Image not ready", Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public boolean onDoubleTap(MotionEvent e) {
                if (imageView.isImageReady()) {
                    PointF sCoord = imageView.viewToSourceCoord(e.getX(), e.getY());
                    Toast.makeText(getApplicationContext(), "Double tap: " + ((int)sCoord.x) + ", " + ((int)sCoord.y), Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(getApplicationContext(), "Double tap: Image not ready", Toast.LENGTH_SHORT).show();
                }
                return true;
            }
        });

        imageView.setImageAsset("squirrel.jpg");
        imageView.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                return gestureDetector.onTouchEvent(motionEvent);
            }
        });
    }

    private void updateNotes() {
        if (position > notes.size() - 1) {
            return;
        }
        getActionBar().setSubtitle(notes.get(position).subtitle);
        ((TextView)findViewById(id.note)).setText(notes.get(position).text);
        findViewById(id.next).setVisibility(position >= notes.size() - 1 ? View.INVISIBLE : View.VISIBLE);
        findViewById(id.previous).setVisibility(position <= 0 ? View.INVISIBLE : View.VISIBLE);
    }

    private static final class Note {
        private final String text;
        private final String subtitle;
        private Note(String subtitle, String text) {
            this.subtitle = subtitle;
            this.text = text;
        }
    }

}

Java Source Code List

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