| /* |
| * 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.example.android.touchexample; |
| |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.drawable.Drawable; |
| import android.util.AttributeSet; |
| import android.view.MotionEvent; |
| import android.view.View; |
| |
| public class TouchExampleView extends View { |
| private Drawable mIcon; |
| private float mPosX; |
| private float mPosY; |
| |
| private VersionedGestureDetector mDetector; |
| private float mScaleFactor = 1.f; |
| |
| public TouchExampleView(Context context) { |
| this(context, null, 0); |
| } |
| |
| public TouchExampleView(Context context, AttributeSet attrs) { |
| this(context, attrs, 0); |
| } |
| |
| public TouchExampleView(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| mIcon = context.getResources().getDrawable(R.drawable.icon); |
| mIcon.setBounds(0, 0, mIcon.getIntrinsicWidth(), mIcon.getIntrinsicHeight()); |
| |
| mDetector = VersionedGestureDetector.newInstance(context, new GestureCallback()); |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent ev) { |
| mDetector.onTouchEvent(ev); |
| return true; |
| } |
| |
| @Override |
| public void onDraw(Canvas canvas) { |
| super.onDraw(canvas); |
| |
| canvas.save(); |
| canvas.translate(mPosX, mPosY); |
| canvas.scale(mScaleFactor, mScaleFactor); |
| mIcon.draw(canvas); |
| canvas.restore(); |
| } |
| |
| private class GestureCallback implements VersionedGestureDetector.OnGestureListener { |
| public void onDrag(float dx, float dy) { |
| mPosX += dx; |
| mPosY += dy; |
| invalidate(); |
| } |
| |
| public void onScale(float scaleFactor) { |
| mScaleFactor *= scaleFactor; |
| |
| // Don't let the object get too small or too large. |
| mScaleFactor = Math.max(0.1f, Math.min(mScaleFactor, 5.0f)); |
| |
| invalidate(); |
| } |
| } |
| } |