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/*
* Copyright (C) 2012 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.systemui;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.graphics.RectF;
import android.util.Log;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import com.android.internal.widget.SizeAdaptiveLayout;
public class ExpandHelper implements Gefingerpoken, OnClickListener {
public interface Callback {
View getChildAtPosition(MotionEvent ev);
View getChildAtPosition(float x, float y);
}
private static final String TAG = "ExpandHelper";
protected static final boolean DEBUG = false;
private static final long EXPAND_DURATION = 250;
@SuppressWarnings("unused")
private Context mContext;
private boolean mStretching;
private View mCurrView;
private float mOldHeight;
private float mNaturalHeight;
private float mInitialTouchSpan;
private Callback mCallback;
private ScaleGestureDetector mDetector;
private ViewScaler mScaler;
private ObjectAnimator mAnimation;
private int mSmallSize;
private int mLargeSize;
private class ViewScaler {
View mView;
public ViewScaler() {}
public void setView(View v) {
mView = v;
}
public void setHeight(float h) {
Log.v(TAG, "SetHeight: setting to " + h);
ViewGroup.LayoutParams lp = mView.getLayoutParams();
lp.height = (int)h;
mView.setLayoutParams(lp);
mView.requestLayout();
}
public float getHeight() {
int height = mView.getLayoutParams().height;
if (height < 0) {
height = mView.getMeasuredHeight();
}
return (float) height;
}
public int getNaturalHeight(int maximum) {
ViewGroup.LayoutParams lp = mView.getLayoutParams();
if (DEBUG) Log.v(TAG, "Inspecting a child of type: " + mView.getClass().getName());
int oldHeight = lp.height;
lp.height = ViewGroup.LayoutParams.WRAP_CONTENT;
mView.setLayoutParams(lp);
mView.measure(
View.MeasureSpec.makeMeasureSpec(mView.getMeasuredWidth(),
View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(maximum,
View.MeasureSpec.AT_MOST));
lp.height = oldHeight;
mView.setLayoutParams(lp);
return mView.getMeasuredHeight();
}
}
public ExpandHelper(Context context, Callback callback, int small, int large) {
mSmallSize = small;
mLargeSize = large;
mContext = context;
mCallback = callback;
mScaler = new ViewScaler();
mDetector =
new ScaleGestureDetector(context,
new ScaleGestureDetector.SimpleOnScaleGestureListener() {
@Override
public boolean onScaleBegin(ScaleGestureDetector detector) {
if (DEBUG) Log.v(TAG, "onscalebegin()");
View v = mCallback.getChildAtPosition(detector.getFocusX(), detector.getFocusY());
// your fingers have to be somewhat close to the bounds of the view in question
mInitialTouchSpan = Math.abs(detector.getCurrentSpanY());
if (DEBUG) Log.d(TAG, "got mInitialTouchSpan: " + mInitialTouchSpan);
mStretching = initScale(v);
return mStretching;
}
@Override
public boolean onScale(ScaleGestureDetector detector) {
if (DEBUG) Log.v(TAG, "onscale() on " + mCurrView);
float h = Math.abs(detector.getCurrentSpanY());
if (DEBUG) Log.d(TAG, "current span is: " + h);
h = h + mOldHeight - mInitialTouchSpan;
h = h<mSmallSize?mSmallSize:(h>mLargeSize?mLargeSize:h);
h = h>mNaturalHeight?mNaturalHeight:h;
if (DEBUG) Log.d(TAG, "scale continues: h=" + h);
mScaler.setHeight(h);
return true;
}
@Override
public void onScaleEnd(ScaleGestureDetector detector) {
if (DEBUG) Log.v(TAG, "onscaleend()");
// I guess we're alone now
if (DEBUG) Log.d(TAG, "scale end");
finishScale(false);
}
});
}
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (DEBUG) Log.d(TAG, "interceptTouch: act=" + (ev.getAction()) +
" stretching=" + mStretching);
mDetector.onTouchEvent(ev);
return mStretching;
}
public boolean onTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
if (DEBUG) Log.d(TAG, "touch: act=" + (action) + " stretching=" + mStretching);
if (mStretching) {
mDetector.onTouchEvent(ev);
}
switch (action) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mStretching = false;
mCurrView = null;
break;
}
return true;
}
private boolean initScale(View v) {
if (v != null) {
if (DEBUG) Log.d(TAG, "scale begins on view: " + v);
mStretching = true;
mCurrView = v;
mScaler.setView(v);
mOldHeight = mScaler.getHeight();
mNaturalHeight = mScaler.getNaturalHeight(mLargeSize);
if (DEBUG) Log.d(TAG, "got mOldHeight: " + mOldHeight +
" mNaturalHeight: " + mNaturalHeight);
v.getParent().requestDisallowInterceptTouchEvent(true);
if (DEBUG) v.setBackgroundColor(0xFFFFFF00);
}
return mStretching;
}
private void finishScale(boolean force) {
float h = mScaler.getHeight();
final boolean wasClosed = (mOldHeight == mSmallSize);
if (wasClosed) {
h = (force || h > mSmallSize) ? mNaturalHeight : mSmallSize;
} else {
h = (force || h < mNaturalHeight) ? mSmallSize : mNaturalHeight;
}
if (DEBUG) mCurrView.setBackgroundColor(0);
mAnimation = ObjectAnimator.ofFloat(mScaler, "height", h).setDuration(EXPAND_DURATION);
mAnimation.start();
mStretching = false;
mCurrView = null;
}
@Override
public void onClick(View v) {
initScale(v);
finishScale(true);
}
}
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