src/com/android/camera/MultiToggleImageButton.java - platform/packages/apps/Camera2 - Git at Google

 /*
  * Copyright (C) 2013 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.camera;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ValueAnimator;
 import android.content.Context;
 import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Matrix;
 import android.graphics.drawable.Drawable;
 import android.os.AsyncTask;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.ImageButton;
 import android.widget.ImageView;

 import com.android.camera.util.Gusterpolator;
 import com.android.camera2.R;

 /*
  * A toggle button that supports two or more states with images rendererd on top
  * for each state.
  * The button is initialized in an XML layout file with an array reference of
  * image ids (e.g. imageIds="@array/camera_flashmode_icons").
  * Each image in the referenced array represents a single integer state.
  * Every time the user touches the button it gets set to next state in line,
  * with the corresponding image drawn onto the face of the button.
  * State wraps back to 0 on user touch when button is already at n-1 state.
  */
 public class MultiToggleImageButton extends ImageButton {
     /*
      * Listener interface for button state changes.
      */
     public interface OnStateChangeListener {
         /*
          * @param view the MultiToggleImageButton that received the touch event
          * @param state the new state the button is in
          */
         public abstract void stateChanged(View view, int state);
     }

     public static final int ANIM_DIRECTION_VERTICAL = 0;
     public static final int ANIM_DIRECTION_HORIZONTAL = 1;

     private static final int ANIM_DURATION_MS = 250;
     private static final int UNSET = -1;

     private OnStateChangeListener mOnStateChangeListener;
     private int mState = UNSET;
     private int[] mImageIds;
     private int[] mDescIds;
     private int mLevel;
     private boolean mClickEnabled = true;
     private int mParentSize;
     private int mAnimDirection;
     private Matrix mMatrix = new Matrix();
     private ValueAnimator mAnimator;

     public MultiToggleImageButton(Context context) {
         super(context);
         init();
     }

     public MultiToggleImageButton(Context context, AttributeSet attrs) {
         super(context, attrs);
         init();
         parseAttributes(context, attrs);
         setState(0);
     }

     public MultiToggleImageButton(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
         init();
         parseAttributes(context, attrs);
         setState(0);
     }

     /*
      * Set the state change listener.
      *
      * @param onStateChangeListener the listener to set
      */
     public void setOnStateChangeListener(OnStateChangeListener onStateChangeListener) {
         mOnStateChangeListener = onStateChangeListener;
     }

     /*
      * Get the current button state.
      *
      */
     public int getState() {
         return mState;
     }

     /*
      * Set the current button state, thus causing the state change listener to
      * get called.
      *
      * @param state the desired state
      */
     public void setState(int state) {
         setState(state, true);
     }

     /*
      * Set the current button state.
      *
      * @param state the desired state
      * @param callListener should the state change listener be called?
      */
     public void setState(final int state, final boolean callListener) {
         setStateAnimatedInternal(state, callListener);
     }

     /**
      * Set the current button state via an animated transition.
      *
      * @param state
      * @param callListener
      */
     private void setStateAnimatedInternal(final int state, final boolean callListener) {
         if (mState == state || mState == UNSET) {
             setStateInternal(state, callListener);
             return;
         }

         if (mImageIds == null) {
             return;
         }

         new AsyncTask<Integer, Void, Bitmap>() {
             @Override
             protected Bitmap doInBackground(Integer... params) {
                 return combine(params[0], params[1]);
             }

             @Override
             protected void onPostExecute(Bitmap bitmap) {
                 if (bitmap == null) {
                     setStateInternal(state, callListener);
                 } else {
                     setImageBitmap(bitmap);

                     int offset;
                     if (mAnimDirection == ANIM_DIRECTION_VERTICAL) {
                         offset = (mParentSize+getHeight())/2;
                     } else if (mAnimDirection == ANIM_DIRECTION_HORIZONTAL) {
                         offset = (mParentSize+getWidth())/2;
                     } else {
                         return;
                     }

                     mAnimator.setFloatValues(-offset, 0.0f);
                     AnimatorSet s = new AnimatorSet();
                     s.play(mAnimator);
                     s.addListener(new AnimatorListenerAdapter() {
                         @Override
                         public void onAnimationStart(Animator animation) {
                             setClickEnabled(false);
                         }

                         @Override
                         public void onAnimationEnd(Animator animation) {
                             setStateInternal(state, callListener);
                             setClickEnabled(true);
                         }
                     });
                     s.start();
                 }
             }
         }.execute(mState, state);
     }

     /**
      * Enable or disable click reactions for this button
      * without affecting visual state.
      * For most cases you'll want to use {@link #setEnabled(boolean)}.
      * @param enabled True if click enabled, false otherwise.
      */
     public void setClickEnabled(boolean enabled) {
         mClickEnabled = enabled;
     }

     private void setStateInternal(int state, boolean callListener) {
         mState = state;
         if (mImageIds != null) {
             setImageByState(mState);
         }

         if (mDescIds != null) {
             String oldContentDescription = String.valueOf(getContentDescription());
             String newContentDescription = getResources().getString(mDescIds[mState]);
             if (oldContentDescription != null && !oldContentDescription.isEmpty()
                     && !oldContentDescription.equals(newContentDescription)) {
                 setContentDescription(newContentDescription);
                 String announceChange = getResources().getString(
                     R.string.button_change_announcement, newContentDescription);
                 announceForAccessibility(announceChange);
             }
         }
         super.setImageLevel(mLevel);

         if (callListener && mOnStateChangeListener != null) {
             mOnStateChangeListener.stateChanged(MultiToggleImageButton.this, getState());
         }
     }

     private void nextState() {
         int state = mState + 1;
         if (state >= mImageIds.length) {
             state = 0;
         }
         setState(state);
     }

     protected void init() {
         this.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 if (mClickEnabled) {
                     nextState();
                 }
             }
         });
         setScaleType(ImageView.ScaleType.MATRIX);

         mAnimator = ValueAnimator.ofFloat(0.0f, 0.0f);
         mAnimator.setDuration(ANIM_DURATION_MS);
         mAnimator.setInterpolator(Gusterpolator.INSTANCE);
         mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
             @Override
             public void onAnimationUpdate(ValueAnimator animation) {
                 mMatrix.reset();
                 if (mAnimDirection == ANIM_DIRECTION_VERTICAL) {
                     mMatrix.setTranslate(0.0f, (Float) animation.getAnimatedValue());
                 } else if (mAnimDirection == ANIM_DIRECTION_HORIZONTAL) {
                     mMatrix.setTranslate((Float) animation.getAnimatedValue(), 0.0f);
                 }

                 setImageMatrix(mMatrix);
                 invalidate();
             }
         });
     }

     private void parseAttributes(Context context, AttributeSet attrs) {
         TypedArray a = context.getTheme().obtainStyledAttributes(
             attrs,
             R.styleable.MultiToggleImageButton,
             0, 0);
         int imageIds = a.getResourceId(R.styleable.MultiToggleImageButton_imageIds, 0);
         if (imageIds > 0) {
             overrideImageIds(imageIds);
         }
         int descIds = a.getResourceId(R.styleable.MultiToggleImageButton_contentDescriptionIds, 0);
         if (descIds > 0) {
             overrideContentDescriptions(descIds);
         }
         a.recycle();
     }

     /**
      * Override the image ids of this button.
      */
     public void overrideImageIds(int resId) {
         TypedArray ids = null;
         try {
             ids = getResources().obtainTypedArray(resId);
             mImageIds = new int[ids.length()];
             for (int i = 0; i < ids.length(); i++) {
                 mImageIds[i] = ids.getResourceId(i, 0);
             }
         } finally {
             if (ids != null) {
                 ids.recycle();
             }
         }
     }

     /**
      * Override the content descriptions of this button.
      */
     public void overrideContentDescriptions(int resId) {
         TypedArray ids = null;
         try {
             ids = getResources().obtainTypedArray(resId);
             mDescIds = new int[ids.length()];
             for (int i = 0; i < ids.length(); i++) {
                 mDescIds[i] = ids.getResourceId(i, 0);
             }
         } finally {
             if (ids != null) {
                 ids.recycle();
             }
         }
     }

     /**
      * Set size info (either width or height, as necessary) of the view containing
      * this button. Used for offset calculations during animation.
      * @param s The size.
      */
     public void setParentSize(int s) {
         mParentSize = s;
     }

     /**
      * Set the animation direction.
      * @param d Either ANIM_DIRECTION_VERTICAL or ANIM_DIRECTION_HORIZONTAL.
      */
     public void setAnimDirection(int d) {
         mAnimDirection = d;
     }

     @Override
     public void setImageLevel(int level) {
         super.setImageLevel(level);
         mLevel = level;
     }

     private void setImageByState(int state) {
         if (mImageIds != null) {
             setImageResource(mImageIds[state]);
         }
         super.setImageLevel(mLevel);
     }

     private Bitmap combine(int oldState, int newState) {
         // in some cases, a new set of image Ids are set via overrideImageIds()
         // and oldState overruns the array.
         // check here for that.
         if (oldState >= mImageIds.length) {
             return null;
         }

         int width = getWidth();
         int height = getHeight();

         if (width <= 0 || height <= 0) {
             return null;
         }

         int[] enabledState = new int[] {android.R.attr.state_enabled};

         // new state
         Drawable newDrawable = getResources().getDrawable(mImageIds[newState]).mutate();
         newDrawable.setState(enabledState);

         // old state
         Drawable oldDrawable = getResources().getDrawable(mImageIds[oldState]).mutate();
         oldDrawable.setState(enabledState);

         // combine 'em
         Bitmap bitmap = null;
         if (mAnimDirection == ANIM_DIRECTION_VERTICAL) {
             int bitmapHeight = (height*2) + ((mParentSize - height)/2);
             int oldBitmapOffset = height + ((mParentSize - height)/2);
             bitmap = Bitmap.createBitmap(width, bitmapHeight, Bitmap.Config.ARGB_8888);
             Canvas canvas = new Canvas(bitmap);
             newDrawable.setBounds(0, 0, newDrawable.getIntrinsicWidth(), newDrawable.getIntrinsicHeight());
             oldDrawable.setBounds(0, oldBitmapOffset, oldDrawable.getIntrinsicWidth(), oldDrawable.getIntrinsicHeight()+oldBitmapOffset);
             newDrawable.draw(canvas);
             oldDrawable.draw(canvas);
         } else if (mAnimDirection == ANIM_DIRECTION_HORIZONTAL) {
             int bitmapWidth = (width*2) + ((mParentSize - width)/2);
             int oldBitmapOffset = width + ((mParentSize - width)/2);
             bitmap = Bitmap.createBitmap(bitmapWidth, height, Bitmap.Config.ARGB_8888);
             Canvas canvas = new Canvas(bitmap);
             newDrawable.setBounds(0, 0, newDrawable.getIntrinsicWidth(), newDrawable.getIntrinsicHeight());
             oldDrawable.setBounds(oldBitmapOffset, 0, oldDrawable.getIntrinsicWidth()+oldBitmapOffset, oldDrawable.getIntrinsicHeight());
             newDrawable.draw(canvas);
             oldDrawable.draw(canvas);
         }

         return bitmap;
     }
 }
	/*
	* Copyright (C) 2013 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.camera;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.animation.ValueAnimator;
	import android.content.Context;
	import android.content.res.TypedArray;
	import android.graphics.Bitmap;
	import android.graphics.Canvas;
	import android.graphics.Matrix;
	import android.graphics.drawable.Drawable;
	import android.os.AsyncTask;
	import android.util.AttributeSet;
	import android.view.View;
	import android.widget.ImageButton;
	import android.widget.ImageView;

	import com.android.camera.util.Gusterpolator;
	import com.android.camera2.R;

	/*
	* A toggle button that supports two or more states with images rendererd on top
	* for each state.
	* The button is initialized in an XML layout file with an array reference of
	* image ids (e.g. imageIds="@array/camera_flashmode_icons").
	* Each image in the referenced array represents a single integer state.
	* Every time the user touches the button it gets set to next state in line,
	* with the corresponding image drawn onto the face of the button.
	* State wraps back to 0 on user touch when button is already at n-1 state.
	*/
	public class MultiToggleImageButton extends ImageButton {
	/*
	* Listener interface for button state changes.
	*/
	public interface OnStateChangeListener {
	/*
	* @param view the MultiToggleImageButton that received the touch event
	* @param state the new state the button is in
	*/
	public abstract void stateChanged(View view, int state);
	}

	public static final int ANIM_DIRECTION_VERTICAL = 0;
	public static final int ANIM_DIRECTION_HORIZONTAL = 1;

	private static final int ANIM_DURATION_MS = 250;
	private static final int UNSET = -1;

	private OnStateChangeListener mOnStateChangeListener;
	private int mState = UNSET;
	private int[] mImageIds;
	private int[] mDescIds;
	private int mLevel;
	private boolean mClickEnabled = true;
	private int mParentSize;
	private int mAnimDirection;
	private Matrix mMatrix = new Matrix();
	private ValueAnimator mAnimator;

	public MultiToggleImageButton(Context context) {
	super(context);
	init();
	}

	public MultiToggleImageButton(Context context, AttributeSet attrs) {
	super(context, attrs);
	init();
	parseAttributes(context, attrs);
	setState(0);
	}

	public MultiToggleImageButton(Context context, AttributeSet attrs, int defStyle) {
	super(context, attrs, defStyle);
	init();
	parseAttributes(context, attrs);
	setState(0);
	}

	/*
	* Set the state change listener.
	*
	* @param onStateChangeListener the listener to set
	*/
	public void setOnStateChangeListener(OnStateChangeListener onStateChangeListener) {
	mOnStateChangeListener = onStateChangeListener;
	}

	/*
	* Get the current button state.
	*
	*/
	public int getState() {
	return mState;
	}

	/*
	* Set the current button state, thus causing the state change listener to
	* get called.
	*
	* @param state the desired state
	*/
	public void setState(int state) {
	setState(state, true);
	}

	/*
	* Set the current button state.
	*
	* @param state the desired state
	* @param callListener should the state change listener be called?
	*/
	public void setState(final int state, final boolean callListener) {
	setStateAnimatedInternal(state, callListener);
	}

	/**
	* Set the current button state via an animated transition.
	*
	* @param state
	* @param callListener
	*/
	private void setStateAnimatedInternal(final int state, final boolean callListener) {
	if (mState == state \|\| mState == UNSET) {
	setStateInternal(state, callListener);
	return;
	}

	if (mImageIds == null) {
	return;
	}

	new AsyncTask<Integer, Void, Bitmap>() {
	@Override
	protected Bitmap doInBackground(Integer... params) {
	return combine(params[0], params[1]);
	}

	@Override
	protected void onPostExecute(Bitmap bitmap) {
	if (bitmap == null) {
	setStateInternal(state, callListener);
	} else {
	setImageBitmap(bitmap);

	int offset;
	if (mAnimDirection == ANIM_DIRECTION_VERTICAL) {
	offset = (mParentSize+getHeight())/2;
	} else if (mAnimDirection == ANIM_DIRECTION_HORIZONTAL) {
	offset = (mParentSize+getWidth())/2;
	} else {
	return;
	}

	mAnimator.setFloatValues(-offset, 0.0f);
	AnimatorSet s = new AnimatorSet();
	s.play(mAnimator);
	s.addListener(new AnimatorListenerAdapter() {
	@Override
	public void onAnimationStart(Animator animation) {
	setClickEnabled(false);
	}

	@Override
	public void onAnimationEnd(Animator animation) {
	setStateInternal(state, callListener);
	setClickEnabled(true);
	}
	});
	s.start();
	}
	}
	}.execute(mState, state);
	}

	/**
	* Enable or disable click reactions for this button
	* without affecting visual state.
	* For most cases you'll want to use {@link #setEnabled(boolean)}.
	* @param enabled True if click enabled, false otherwise.
	*/
	public void setClickEnabled(boolean enabled) {
	mClickEnabled = enabled;
	}

	private void setStateInternal(int state, boolean callListener) {
	mState = state;
	if (mImageIds != null) {
	setImageByState(mState);
	}

	if (mDescIds != null) {
	String oldContentDescription = String.valueOf(getContentDescription());
	String newContentDescription = getResources().getString(mDescIds[mState]);
	if (oldContentDescription != null && !oldContentDescription.isEmpty()
	&& !oldContentDescription.equals(newContentDescription)) {
	setContentDescription(newContentDescription);
	String announceChange = getResources().getString(
	R.string.button_change_announcement, newContentDescription);
	announceForAccessibility(announceChange);
	}
	}
	super.setImageLevel(mLevel);

	if (callListener && mOnStateChangeListener != null) {
	mOnStateChangeListener.stateChanged(MultiToggleImageButton.this, getState());
	}
	}

	private void nextState() {
	int state = mState + 1;
	if (state >= mImageIds.length) {
	state = 0;
	}
	setState(state);
	}

	protected void init() {
	this.setOnClickListener(new View.OnClickListener() {
	@Override
	public void onClick(View v) {
	if (mClickEnabled) {
	nextState();
	}
	}
	});
	setScaleType(ImageView.ScaleType.MATRIX);

	mAnimator = ValueAnimator.ofFloat(0.0f, 0.0f);
	mAnimator.setDuration(ANIM_DURATION_MS);
	mAnimator.setInterpolator(Gusterpolator.INSTANCE);
	mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
	@Override
	public void onAnimationUpdate(ValueAnimator animation) {
	mMatrix.reset();
	if (mAnimDirection == ANIM_DIRECTION_VERTICAL) {
	mMatrix.setTranslate(0.0f, (Float) animation.getAnimatedValue());
	} else if (mAnimDirection == ANIM_DIRECTION_HORIZONTAL) {
	mMatrix.setTranslate((Float) animation.getAnimatedValue(), 0.0f);
	}

	setImageMatrix(mMatrix);
	invalidate();
	}
	});
	}

	private void parseAttributes(Context context, AttributeSet attrs) {
	TypedArray a = context.getTheme().obtainStyledAttributes(
	attrs,
	R.styleable.MultiToggleImageButton,
	0, 0);
	int imageIds = a.getResourceId(R.styleable.MultiToggleImageButton_imageIds, 0);
	if (imageIds > 0) {
	overrideImageIds(imageIds);
	}
	int descIds = a.getResourceId(R.styleable.MultiToggleImageButton_contentDescriptionIds, 0);
	if (descIds > 0) {
	overrideContentDescriptions(descIds);
	}
	a.recycle();
	}

	/**
	* Override the image ids of this button.
	*/
	public void overrideImageIds(int resId) {
	TypedArray ids = null;
	try {
	ids = getResources().obtainTypedArray(resId);
	mImageIds = new int[ids.length()];
	for (int i = 0; i < ids.length(); i++) {
	mImageIds[i] = ids.getResourceId(i, 0);
	}
	} finally {
	if (ids != null) {
	ids.recycle();
	}
	}
	}

	/**
	* Override the content descriptions of this button.
	*/
	public void overrideContentDescriptions(int resId) {
	TypedArray ids = null;
	try {
	ids = getResources().obtainTypedArray(resId);
	mDescIds = new int[ids.length()];
	for (int i = 0; i < ids.length(); i++) {
	mDescIds[i] = ids.getResourceId(i, 0);
	}
	} finally {
	if (ids != null) {
	ids.recycle();
	}
	}
	}

	/**
	* Set size info (either width or height, as necessary) of the view containing
	* this button. Used for offset calculations during animation.
	* @param s The size.
	*/
	public void setParentSize(int s) {
	mParentSize = s;
	}

	/**
	* Set the animation direction.
	* @param d Either ANIM_DIRECTION_VERTICAL or ANIM_DIRECTION_HORIZONTAL.
	*/
	public void setAnimDirection(int d) {
	mAnimDirection = d;
	}

	@Override
	public void setImageLevel(int level) {
	super.setImageLevel(level);
	mLevel = level;
	}

	private void setImageByState(int state) {
	if (mImageIds != null) {
	setImageResource(mImageIds[state]);
	}
	super.setImageLevel(mLevel);
	}

	private Bitmap combine(int oldState, int newState) {
	// in some cases, a new set of image Ids are set via overrideImageIds()
	// and oldState overruns the array.
	// check here for that.
	if (oldState >= mImageIds.length) {
	return null;
	}

	int width = getWidth();
	int height = getHeight();

	if (width <= 0 \|\| height <= 0) {
	return null;
	}

	int[] enabledState = new int[] {android.R.attr.state_enabled};

	// new state
	Drawable newDrawable = getResources().getDrawable(mImageIds[newState]).mutate();
	newDrawable.setState(enabledState);

	// old state
	Drawable oldDrawable = getResources().getDrawable(mImageIds[oldState]).mutate();
	oldDrawable.setState(enabledState);

	// combine 'em
	Bitmap bitmap = null;
	if (mAnimDirection == ANIM_DIRECTION_VERTICAL) {
	int bitmapHeight = (height*2) + ((mParentSize - height)/2);
	int oldBitmapOffset = height + ((mParentSize - height)/2);
	bitmap = Bitmap.createBitmap(width, bitmapHeight, Bitmap.Config.ARGB_8888);
	Canvas canvas = new Canvas(bitmap);
	newDrawable.setBounds(0, 0, newDrawable.getIntrinsicWidth(), newDrawable.getIntrinsicHeight());
	oldDrawable.setBounds(0, oldBitmapOffset, oldDrawable.getIntrinsicWidth(), oldDrawable.getIntrinsicHeight()+oldBitmapOffset);
	newDrawable.draw(canvas);
	oldDrawable.draw(canvas);
	} else if (mAnimDirection == ANIM_DIRECTION_HORIZONTAL) {
	int bitmapWidth = (width*2) + ((mParentSize - width)/2);
	int oldBitmapOffset = width + ((mParentSize - width)/2);
	bitmap = Bitmap.createBitmap(bitmapWidth, height, Bitmap.Config.ARGB_8888);
	Canvas canvas = new Canvas(bitmap);
	newDrawable.setBounds(0, 0, newDrawable.getIntrinsicWidth(), newDrawable.getIntrinsicHeight());
	oldDrawable.setBounds(oldBitmapOffset, 0, oldDrawable.getIntrinsicWidth()+oldBitmapOffset, oldDrawable.getIntrinsicHeight());
	newDrawable.draw(canvas);
	oldDrawable.draw(canvas);
	}

	return bitmap;
	}
	}