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Victor Shcherb 2015-05-03 16:58:58 +02:00
parent 630c5016ac
commit 354bebde18
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150
OsmAnd/src/com/github/ksoichiro/android/observablescrollview/CacheFragmentStatePagerAdapter.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.util.SparseArray;
import android.view.ViewGroup;
/**
* FragmentStatePagerAdapter that caches each pages.
* FragmentStatePagerAdapter is also originally caches pages,
* but its keys are not public nor documented, so depending
* on how it create cache key is dangerous.
* This adapter caches pages by itself and provide getter method to the cache.
*/
public abstract class CacheFragmentStatePagerAdapter extends FragmentStatePagerAdapter {
private static final String STATE_SUPER_STATE = "superState";
private static final String STATE_PAGES = "pages";
private static final String STATE_PAGE_INDEX_PREFIX = "pageIndex:";
private static final String STATE_PAGE_KEY_PREFIX = "page:";
private FragmentManager mFm;
private SparseArray<Fragment> mPages;
public CacheFragmentStatePagerAdapter(FragmentManager fm) {
super(fm);
mPages = new SparseArray<Fragment>();
mFm = fm;
}
@Override
public Parcelable saveState() {
Parcelable p = super.saveState();
Bundle bundle = new Bundle();
bundle.putParcelable(STATE_SUPER_STATE, p);
bundle.putInt(STATE_PAGES, mPages.size());
if (0 < mPages.size()) {
for (int i = 0; i < mPages.size(); i++) {
int position = mPages.keyAt(i);
bundle.putInt(createCacheIndex(i), position);
Fragment f = mPages.get(position);
mFm.putFragment(bundle, createCacheKey(position), f);
}
}
return bundle;
}
@Override
public void restoreState(Parcelable state, ClassLoader loader) {
Bundle bundle = (Bundle) state;
int pages = bundle.getInt(STATE_PAGES);
if (0 < pages) {
for (int i = 0; i < pages; i++) {
int position = bundle.getInt(createCacheIndex(i));
Fragment f = mFm.getFragment(bundle, createCacheKey(position));
mPages.put(position, f);
}
}
Parcelable p = bundle.getParcelable(STATE_SUPER_STATE);
super.restoreState(p, loader);
}
/**
* Get a new Fragment instance.
* Each fragments are automatically cached in this method,
* so you don't have to do it by yourself.
* If you want to implement instantiation of Fragments,
* you should override {@link #createItem(int)} instead.
*
* {@inheritDoc}
*
* @param position position of the item in the adapter
* @return fragment instance
*/
@Override
public Fragment getItem(int position) {
Fragment f = createItem(position);
// We should cache fragments manually to access to them later
mPages.put(position, f);
return f;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
if (0 <= mPages.indexOfKey(position)) {
mPages.remove(position);
}
super.destroyItem(container, position, object);
}
/**
* Get the item at the specified position in the adapter.
*
* @param position position of the item in the adapter
* @return fragment instance
*/
public Fragment getItemAt(int position) {
return mPages.get(position);
}
/**
* Create a new Fragment instance.
* This is called inside {@link #getItem(int)}.
*
* @param position position of the item in the adapter
* @return fragment instance
*/
protected abstract Fragment createItem(int position);
/**
* Create an index string for caching Fragment pages.
*
* @param index index of the item in the adapter
* @return key string for caching Fragment pages
*/
protected String createCacheIndex(int index) {
return STATE_PAGE_INDEX_PREFIX + index;
}
/**
* Create a key string for caching Fragment pages.
*
* @param position position of the item in the adapter
* @return key string for caching Fragment pages
*/
protected String createCacheKey(int position) {
return STATE_PAGE_KEY_PREFIX + position;
}
}

384
OsmAnd/src/com/github/ksoichiro/android/observablescrollview/ObservableGridView.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.content.Context;
import android.os.Build;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.SparseIntArray;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.GridView;
/**
* GridView that its scroll position can be observed.
*/
public class ObservableGridView extends GridView implements Scrollable {
// Fields that should be saved onSaveInstanceState
private int mPrevFirstVisiblePosition;
private int mPrevFirstVisibleChildHeight = -1;
private int mPrevScrolledChildrenHeight;
private int mPrevScrollY;
private int mScrollY;
private SparseIntArray mChildrenHeights;
// Fields that don't need to be saved onSaveInstanceState
private ObservableScrollViewCallbacks mCallbacks;
private ScrollState mScrollState;
private boolean mFirstScroll;
private boolean mDragging;
private boolean mIntercepted;
private MotionEvent mPrevMoveEvent;
private ViewGroup mTouchInterceptionViewGroup;
private OnScrollListener mOriginalScrollListener;
private OnScrollListener mScrollListener = new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (mOriginalScrollListener != null) {
mOriginalScrollListener.onScrollStateChanged(view, scrollState);
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (mOriginalScrollListener != null) {
mOriginalScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
// AbsListView#invokeOnItemScrollListener calls onScrollChanged(0, 0, 0, 0)
// on Android 4.0+, but Android 2.3 is not. (Android 3.0 is unknown)
// So call it with onScrollListener.
onScrollChanged();
}
};
public ObservableGridView(Context context) {
super(context);
init();
}
public ObservableGridView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public ObservableGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
mPrevFirstVisiblePosition = ss.prevFirstVisiblePosition;
mPrevFirstVisibleChildHeight = ss.prevFirstVisibleChildHeight;
mPrevScrolledChildrenHeight = ss.prevScrolledChildrenHeight;
mPrevScrollY = ss.prevScrollY;
mScrollY = ss.scrollY;
mChildrenHeights = ss.childrenHeights;
super.onRestoreInstanceState(ss.getSuperState());
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.prevFirstVisiblePosition = mPrevFirstVisiblePosition;
ss.prevFirstVisibleChildHeight = mPrevFirstVisibleChildHeight;
ss.prevScrolledChildrenHeight = mPrevScrolledChildrenHeight;
ss.prevScrollY = mPrevScrollY;
ss.scrollY = mScrollY;
ss.childrenHeights = mChildrenHeights;
return ss;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
// Whether or not motion events are consumed by children,
// flag initializations which are related to ACTION_DOWN events should be executed.
// Because if the ACTION_DOWN is consumed by children and only ACTION_MOVEs are
// passed to parent (this view), the flags will be invalid.
// Also, applications might implement initialization codes to onDownMotionEvent,
// so call it here.
mFirstScroll = mDragging = true;
mCallbacks.onDownMotionEvent();
break;
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mIntercepted = false;
mDragging = false;
mCallbacks.onUpOrCancelMotionEvent(mScrollState);
break;
case MotionEvent.ACTION_MOVE:
if (mPrevMoveEvent == null) {
mPrevMoveEvent = ev;
}
float diffY = ev.getY() - mPrevMoveEvent.getY();
mPrevMoveEvent = MotionEvent.obtainNoHistory(ev);
if (getCurrentScrollY() - diffY <= 0) {
// Can't scroll anymore.
if (mIntercepted) {
// Already dispatched ACTION_DOWN event to parents, so stop here.
return false;
}
// Apps can set the interception target other than the direct parent.
final ViewGroup parent;
if (mTouchInterceptionViewGroup == null) {
parent = (ViewGroup) getParent();
} else {
parent = mTouchInterceptionViewGroup;
}
// Get offset to parents. If the parent is not the direct parent,
// we should aggregate offsets from all of the parents.
float offsetX = 0;
float offsetY = 0;
for (View v = this; v != null && v != parent; v = (View) v.getParent()) {
offsetX += v.getLeft() - v.getScrollX();
offsetY += v.getTop() - v.getScrollY();
}
final MotionEvent event = MotionEvent.obtainNoHistory(ev);
event.offsetLocation(offsetX, offsetY);
if (parent.onInterceptTouchEvent(event)) {
mIntercepted = true;
// If the parent wants to intercept ACTION_MOVE events,
// we pass ACTION_DOWN event to the parent
// as if these touch events just have began now.
event.setAction(MotionEvent.ACTION_DOWN);
// Return this onTouchEvent() first and set ACTION_DOWN event for parent
// to the queue, to keep events sequence.
post(new Runnable() {
@Override
public void run() {
parent.dispatchTouchEvent(event);
}
});
return false;
}
// Even when this can't be scrolled anymore,
// simply returning false here may cause subView's click,
// so delegate it to super.
return super.onTouchEvent(ev);
}
break;
}
}
return super.onTouchEvent(ev);
}
@Override
public void setOnScrollListener(OnScrollListener l) {
// Don't set l to super.setOnScrollListener().
// l receives all events through mScrollListener.
mOriginalScrollListener = l;
}
@Override
public void setScrollViewCallbacks(ObservableScrollViewCallbacks listener) {
mCallbacks = listener;
}
@Override
public void setTouchInterceptionViewGroup(ViewGroup viewGroup) {
mTouchInterceptionViewGroup = viewGroup;
}
@Override
public void scrollVerticallyTo(int y) {
scrollTo(0, y);
}
@Override
public int getCurrentScrollY() {
return mScrollY;
}
private void init() {
mChildrenHeights = new SparseIntArray();
super.setOnScrollListener(mScrollListener);
}
private int getNumColumnsCompat() {
if (Build.VERSION.SDK_INT >= 11) {
return getNumColumns();
} else {
int columns = 0;
if (getChildCount() > 0) {
int width = getChildAt(0).getMeasuredWidth();
if (width > 0) {
columns = getWidth() / width;
}
}
return columns > 0 ? columns : AUTO_FIT;
}
}
private void onScrollChanged() {
if (mCallbacks != null) {
if (getChildCount() > 0) {
int firstVisiblePosition = getFirstVisiblePosition();
for (int i = getFirstVisiblePosition(), j = 0; i <= getLastVisiblePosition(); i++, j++) {
if (mChildrenHeights.indexOfKey(i) < 0 || getChildAt(j).getHeight() != mChildrenHeights.get(i)) {
if (i % getNumColumnsCompat() == 0) {
mChildrenHeights.put(i, getChildAt(j).getHeight());
}
}
}
View firstVisibleChild = getChildAt(0);
if (firstVisibleChild != null) {
if (mPrevFirstVisiblePosition < firstVisiblePosition) {
// scroll down
int skippedChildrenHeight = 0;
if (firstVisiblePosition - mPrevFirstVisiblePosition != 1) {
for (int i = firstVisiblePosition - 1; i > mPrevFirstVisiblePosition; i--) {
if (0 < mChildrenHeights.indexOfKey(i)) {
skippedChildrenHeight += mChildrenHeights.get(i);
}
}
}
mPrevScrolledChildrenHeight += mPrevFirstVisibleChildHeight + skippedChildrenHeight;
mPrevFirstVisibleChildHeight = firstVisibleChild.getHeight();
} else if (firstVisiblePosition < mPrevFirstVisiblePosition) {
// scroll up
int skippedChildrenHeight = 0;
if (mPrevFirstVisiblePosition - firstVisiblePosition != 1) {
for (int i = mPrevFirstVisiblePosition - 1; i > firstVisiblePosition; i--) {
if (0 < mChildrenHeights.indexOfKey(i)) {
skippedChildrenHeight += mChildrenHeights.get(i);
}
}
}
mPrevScrolledChildrenHeight -= firstVisibleChild.getHeight() + skippedChildrenHeight;
mPrevFirstVisibleChildHeight = firstVisibleChild.getHeight();
} else if (firstVisiblePosition == 0) {
mPrevFirstVisibleChildHeight = firstVisibleChild.getHeight();
}
if (mPrevFirstVisibleChildHeight < 0) {
mPrevFirstVisibleChildHeight = 0;
}
mScrollY = mPrevScrolledChildrenHeight - firstVisibleChild.getTop();
mPrevFirstVisiblePosition = firstVisiblePosition;
mCallbacks.onScrollChanged(mScrollY, mFirstScroll, mDragging);
if (mFirstScroll) {
mFirstScroll = false;
}
if (mPrevScrollY < mScrollY) {
mScrollState = ScrollState.UP;
} else if (mScrollY < mPrevScrollY) {
mScrollState = ScrollState.DOWN;
} else {
mScrollState = ScrollState.STOP;
}
mPrevScrollY = mScrollY;
}
}
}
}
static class SavedState extends BaseSavedState {
int prevFirstVisiblePosition;
int prevFirstVisibleChildHeight = -1;
int prevScrolledChildrenHeight;
int prevScrollY;
int scrollY;
SparseIntArray childrenHeights;
/**
* Called by onSaveInstanceState.
*/
SavedState(Parcelable superState) {
super(superState);
}
/**
* Called by CREATOR.
*/
private SavedState(Parcel in) {
super(in);
prevFirstVisiblePosition = in.readInt();
prevFirstVisibleChildHeight = in.readInt();
prevScrolledChildrenHeight = in.readInt();
prevScrollY = in.readInt();
scrollY = in.readInt();
childrenHeights = new SparseIntArray();
final int numOfChildren = in.readInt();
if (0 < numOfChildren) {
for (int i = 0; i < numOfChildren; i++) {
final int key = in.readInt();
final int value = in.readInt();
childrenHeights.put(key, value);
}
}
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(prevFirstVisiblePosition);
out.writeInt(prevFirstVisibleChildHeight);
out.writeInt(prevScrolledChildrenHeight);
out.writeInt(prevScrollY);
out.writeInt(scrollY);
final int numOfChildren = childrenHeights == null ? 0 : childrenHeights.size();
out.writeInt(numOfChildren);
if (0 < numOfChildren) {
for (int i = 0; i < numOfChildren; i++) {
out.writeInt(childrenHeights.keyAt(i));
out.writeInt(childrenHeights.valueAt(i));
}
}
}
public static final Parcelable.Creator<SavedState> CREATOR
= new Parcelable.Creator<SavedState>() {
@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
@Override
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}

381
OsmAnd/src/com/github/ksoichiro/android/observablescrollview/ObservableListView.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.SparseIntArray;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ListView;
/**
* ListView that its scroll position can be observed.
*/
public class ObservableListView extends ListView implements Scrollable {
// Fields that should be saved onSaveInstanceState
private int mPrevFirstVisiblePosition;
private int mPrevFirstVisibleChildHeight = -1;
private int mPrevScrolledChildrenHeight;
private int mPrevScrollY;
private int mScrollY;
private SparseIntArray mChildrenHeights;
// Fields that don't need to be saved onSaveInstanceState
private ObservableScrollViewCallbacks mCallbacks;
private ScrollState mScrollState;
private boolean mFirstScroll;
private boolean mDragging;
private boolean mIntercepted;
private MotionEvent mPrevMoveEvent;
private ViewGroup mTouchInterceptionViewGroup;
private OnScrollListener mOriginalScrollListener;
private OnScrollListener mScrollListener = new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (mOriginalScrollListener != null) {
mOriginalScrollListener.onScrollStateChanged(view, scrollState);
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (mOriginalScrollListener != null) {
mOriginalScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
// AbsListView#invokeOnItemScrollListener calls onScrollChanged(0, 0, 0, 0)
// on Android 4.0+, but Android 2.3 is not. (Android 3.0 is unknown)
// So call it with onScrollListener.
onScrollChanged();
}
};
public ObservableListView(Context context) {
super(context);
init();
}
public ObservableListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public ObservableListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
mPrevFirstVisiblePosition = ss.prevFirstVisiblePosition;
mPrevFirstVisibleChildHeight = ss.prevFirstVisibleChildHeight;
mPrevScrolledChildrenHeight = ss.prevScrolledChildrenHeight;
mPrevScrollY = ss.prevScrollY;
mScrollY = ss.scrollY;
mChildrenHeights = ss.childrenHeights;
super.onRestoreInstanceState(ss.getSuperState());
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.prevFirstVisiblePosition = mPrevFirstVisiblePosition;
ss.prevFirstVisibleChildHeight = mPrevFirstVisibleChildHeight;
ss.prevScrolledChildrenHeight = mPrevScrolledChildrenHeight;
ss.prevScrollY = mPrevScrollY;
ss.scrollY = mScrollY;
ss.childrenHeights = mChildrenHeights;
return ss;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
// Whether or not motion events are consumed by children,
// flag initializations which are related to ACTION_DOWN events should be executed.
// Because if the ACTION_DOWN is consumed by children and only ACTION_MOVEs are
// passed to parent (this view), the flags will be invalid.
// Also, applications might implement initialization codes to onDownMotionEvent,
// so call it here.
mFirstScroll = mDragging = true;
mCallbacks.onDownMotionEvent();
break;
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mIntercepted = false;
mDragging = false;
mCallbacks.onUpOrCancelMotionEvent(mScrollState);
break;
case MotionEvent.ACTION_MOVE:
if (mPrevMoveEvent == null) {
mPrevMoveEvent = ev;
}
float diffY = ev.getY() - mPrevMoveEvent.getY();
mPrevMoveEvent = MotionEvent.obtainNoHistory(ev);
if (getCurrentScrollY() - diffY <= 0) {
// Can't scroll anymore.
if (mIntercepted) {
// Already dispatched ACTION_DOWN event to parents, so stop here.
return false;
}
// Apps can set the interception target other than the direct parent.
final ViewGroup parent;
if (mTouchInterceptionViewGroup == null) {
parent = (ViewGroup) getParent();
} else {
parent = mTouchInterceptionViewGroup;
}
// Get offset to parents. If the parent is not the direct parent,
// we should aggregate offsets from all of the parents.
float offsetX = 0;
float offsetY = 0;
for (View v = this; v != null && v != parent; v = (View) v.getParent()) {
offsetX += v.getLeft() - v.getScrollX();
offsetY += v.getTop() - v.getScrollY();
}
final MotionEvent event = MotionEvent.obtainNoHistory(ev);
event.offsetLocation(offsetX, offsetY);
if (parent.onInterceptTouchEvent(event)) {
mIntercepted = true;
// If the parent wants to intercept ACTION_MOVE events,
// we pass ACTION_DOWN event to the parent
// as if these touch events just have began now.
event.setAction(MotionEvent.ACTION_DOWN);
// Return this onTouchEvent() first and set ACTION_DOWN event for parent
// to the queue, to keep events sequence.
post(new Runnable() {
@Override
public void run() {
parent.dispatchTouchEvent(event);
}
});
return false;
}
// Even when this can't be scrolled anymore,
// simply returning false here may cause subView's click,
// so delegate it to super.
return super.onTouchEvent(ev);
}
break;
}
}
return super.onTouchEvent(ev);
}
@Override
public void setOnScrollListener(OnScrollListener l) {
// Don't set l to super.setOnScrollListener().
// l receives all events through mScrollListener.
mOriginalScrollListener = l;
}
@Override
public void setScrollViewCallbacks(ObservableScrollViewCallbacks listener) {
mCallbacks = listener;
}
@Override
public void setTouchInterceptionViewGroup(ViewGroup viewGroup) {
mTouchInterceptionViewGroup = viewGroup;
}
@Override
public void scrollVerticallyTo(int y) {
View firstVisibleChild = getChildAt(0);
if (firstVisibleChild != null) {
int baseHeight = firstVisibleChild.getHeight();
int position = y / baseHeight;
setSelection(position);
}
}
@Override
public int getCurrentScrollY() {
return mScrollY;
}
private void init() {
mChildrenHeights = new SparseIntArray();
super.setOnScrollListener(mScrollListener);
}
private void onScrollChanged() {
if (mCallbacks != null) {
if (getChildCount() > 0) {
int firstVisiblePosition = getFirstVisiblePosition();
for (int i = getFirstVisiblePosition(), j = 0; i <= getLastVisiblePosition(); i++, j++) {
if (mChildrenHeights.indexOfKey(i) < 0 || getChildAt(j).getHeight() != mChildrenHeights.get(i)) {
mChildrenHeights.put(i, getChildAt(j).getHeight());
}
}
View firstVisibleChild = getChildAt(0);
if (firstVisibleChild != null) {
if (mPrevFirstVisiblePosition < firstVisiblePosition) {
// scroll down
int skippedChildrenHeight = 0;
if (firstVisiblePosition - mPrevFirstVisiblePosition != 1) {
for (int i = firstVisiblePosition - 1; i > mPrevFirstVisiblePosition; i--) {
if (0 < mChildrenHeights.indexOfKey(i)) {
skippedChildrenHeight += mChildrenHeights.get(i);
} else {
// Approximate each item's height to the first visible child.
// It may be incorrect, but without this, scrollY will be broken
// when scrolling from the bottom.
skippedChildrenHeight += firstVisibleChild.getHeight();
}
}
}
mPrevScrolledChildrenHeight += mPrevFirstVisibleChildHeight + skippedChildrenHeight;
mPrevFirstVisibleChildHeight = firstVisibleChild.getHeight();
} else if (firstVisiblePosition < mPrevFirstVisiblePosition) {
// scroll up
int skippedChildrenHeight = 0;
if (mPrevFirstVisiblePosition - firstVisiblePosition != 1) {
for (int i = mPrevFirstVisiblePosition - 1; i > firstVisiblePosition; i--) {
if (0 < mChildrenHeights.indexOfKey(i)) {
skippedChildrenHeight += mChildrenHeights.get(i);
} else {
// Approximate each item's height to the first visible child.
// It may be incorrect, but without this, scrollY will be broken
// when scrolling from the bottom.
skippedChildrenHeight += firstVisibleChild.getHeight();
}
}
}
mPrevScrolledChildrenHeight -= firstVisibleChild.getHeight() + skippedChildrenHeight;
mPrevFirstVisibleChildHeight = firstVisibleChild.getHeight();
} else if (firstVisiblePosition == 0) {
mPrevFirstVisibleChildHeight = firstVisibleChild.getHeight();
}
if (mPrevFirstVisibleChildHeight < 0) {
mPrevFirstVisibleChildHeight = 0;
}
mScrollY = mPrevScrolledChildrenHeight - firstVisibleChild.getTop();
mPrevFirstVisiblePosition = firstVisiblePosition;
mCallbacks.onScrollChanged(mScrollY, mFirstScroll, mDragging);
if (mFirstScroll) {
mFirstScroll = false;
}
if (mPrevScrollY < mScrollY) {
mScrollState = ScrollState.UP;
} else if (mScrollY < mPrevScrollY) {
mScrollState = ScrollState.DOWN;
} else {
mScrollState = ScrollState.STOP;
}
mPrevScrollY = mScrollY;
}
}
}
}
static class SavedState extends BaseSavedState {
int prevFirstVisiblePosition;
int prevFirstVisibleChildHeight = -1;
int prevScrolledChildrenHeight;
int prevScrollY;
int scrollY;
SparseIntArray childrenHeights;
/**
* Called by onSaveInstanceState.
*/
SavedState(Parcelable superState) {
super(superState);
}
/**
* Called by CREATOR.
*/
private SavedState(Parcel in) {
super(in);
prevFirstVisiblePosition = in.readInt();
prevFirstVisibleChildHeight = in.readInt();
prevScrolledChildrenHeight = in.readInt();
prevScrollY = in.readInt();
scrollY = in.readInt();
childrenHeights = new SparseIntArray();
final int numOfChildren = in.readInt();
if (0 < numOfChildren) {
for (int i = 0; i < numOfChildren; i++) {
final int key = in.readInt();
final int value = in.readInt();
childrenHeights.put(key, value);
}
}
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(prevFirstVisiblePosition);
out.writeInt(prevFirstVisibleChildHeight);
out.writeInt(prevScrolledChildrenHeight);
out.writeInt(prevScrollY);
out.writeInt(scrollY);
final int numOfChildren = childrenHeights == null ? 0 : childrenHeights.size();
out.writeInt(numOfChildren);
if (0 < numOfChildren) {
for (int i = 0; i < numOfChildren; i++) {
out.writeInt(childrenHeights.keyAt(i));
out.writeInt(childrenHeights.valueAt(i));
}
}
}
public static final Parcelable.Creator<SavedState> CREATOR
= new Parcelable.Creator<SavedState>() {
@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
@Override
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}

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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ScrollView;
/**
* ScrollView that its scroll position can be observed.
*/
public class ObservableScrollView extends ScrollView implements Scrollable {
// Fields that should be saved onSaveInstanceState
private int mPrevScrollY;
private int mScrollY;
// Fields that don't need to be saved onSaveInstanceState
private ObservableScrollViewCallbacks mCallbacks;
private ScrollState mScrollState;
private boolean mFirstScroll;
private boolean mDragging;
private boolean mIntercepted;
private MotionEvent mPrevMoveEvent;
private ViewGroup mTouchInterceptionViewGroup;
public ObservableScrollView(Context context) {
super(context);
}
public ObservableScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ObservableScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
mPrevScrollY = ss.prevScrollY;
mScrollY = ss.scrollY;
super.onRestoreInstanceState(ss.getSuperState());
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.prevScrollY = mPrevScrollY;
ss.scrollY = mScrollY;
return ss;
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (mCallbacks != null) {
mScrollY = t;
mCallbacks.onScrollChanged(t, mFirstScroll, mDragging);
if (mFirstScroll) {
mFirstScroll = false;
}
if (mPrevScrollY < t) {
mScrollState = ScrollState.UP;
} else if (t < mPrevScrollY) {
mScrollState = ScrollState.DOWN;
//} else {
// Keep previous state while dragging.
// Never makes it STOP even if scrollY not changed.
// Before Android 4.4, onTouchEvent calls onScrollChanged directly for ACTION_MOVE,
// which makes mScrollState always STOP when onUpOrCancelMotionEvent is called.
// STOP state is now meaningless for ScrollView.
}
mPrevScrollY = t;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
// Whether or not motion events are consumed by children,
// flag initializations which are related to ACTION_DOWN events should be executed.
// Because if the ACTION_DOWN is consumed by children and only ACTION_MOVEs are
// passed to parent (this view), the flags will be invalid.
// Also, applications might implement initialization codes to onDownMotionEvent,
// so call it here.
mFirstScroll = mDragging = true;
mCallbacks.onDownMotionEvent();
break;
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mIntercepted = false;
mDragging = false;
mCallbacks.onUpOrCancelMotionEvent(mScrollState);
break;
case MotionEvent.ACTION_MOVE:
if (mPrevMoveEvent == null) {
mPrevMoveEvent = ev;
}
float diffY = ev.getY() - mPrevMoveEvent.getY();
mPrevMoveEvent = MotionEvent.obtainNoHistory(ev);
if (getCurrentScrollY() - diffY <= 0) {
// Can't scroll anymore.
if (mIntercepted) {
// Already dispatched ACTION_DOWN event to parents, so stop here.
return false;
}
// Apps can set the interception target other than the direct parent.
final ViewGroup parent;
if (mTouchInterceptionViewGroup == null) {
parent = (ViewGroup) getParent();
} else {
parent = mTouchInterceptionViewGroup;
}
// Get offset to parents. If the parent is not the direct parent,
// we should aggregate offsets from all of the parents.
float offsetX = 0;
float offsetY = 0;
for (View v = this; v != null && v != parent; v = (View) v.getParent()) {
offsetX += v.getLeft() - v.getScrollX();
offsetY += v.getTop() - v.getScrollY();
}
final MotionEvent event = MotionEvent.obtainNoHistory(ev);
event.offsetLocation(offsetX, offsetY);
if (parent.onInterceptTouchEvent(event)) {
mIntercepted = true;
// If the parent wants to intercept ACTION_MOVE events,
// we pass ACTION_DOWN event to the parent
// as if these touch events just have began now.
event.setAction(MotionEvent.ACTION_DOWN);
// Return this onTouchEvent() first and set ACTION_DOWN event for parent
// to the queue, to keep events sequence.
post(new Runnable() {
@Override
public void run() {
parent.dispatchTouchEvent(event);
}
});
return false;
}
// Even when this can't be scrolled anymore,
// simply returning false here may cause subView's click,
// so delegate it to super.
return super.onTouchEvent(ev);
}
break;
}
}
return super.onTouchEvent(ev);
}
@Override
public void setScrollViewCallbacks(ObservableScrollViewCallbacks listener) {
mCallbacks = listener;
}
@Override
public void setTouchInterceptionViewGroup(ViewGroup viewGroup) {
mTouchInterceptionViewGroup = viewGroup;
}
@Override
public void scrollVerticallyTo(int y) {
scrollTo(0, y);
}
@Override
public int getCurrentScrollY() {
return mScrollY;
}
static class SavedState extends BaseSavedState {
int prevScrollY;
int scrollY;
/**
* Called by onSaveInstanceState.
*/
SavedState(Parcelable superState) {
super(superState);
}
/**
* Called by CREATOR.
*/
private SavedState(Parcel in) {
super(in);
prevScrollY = in.readInt();
scrollY = in.readInt();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(prevScrollY);
out.writeInt(scrollY);
}
public static final Parcelable.Creator<SavedState> CREATOR
= new Parcelable.Creator<SavedState>() {
@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
@Override
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}

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OsmAnd/src/com/github/ksoichiro/android/observablescrollview/ObservableScrollViewCallbacks.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
/**
* Callbacks for Scrollable widgets.
*/
public interface ObservableScrollViewCallbacks {
/**
* Called when the scroll change events occurred.
* This won't be called just after the view is laid out, so if you'd like to
* initialize the position of your views with this method, you should call this manually
* or invoke scroll as appropriate.
*
* @param scrollY scroll position in Y axis
* @param firstScroll true when this is called for the first time in the consecutive motion events
* @param dragging true when the view is dragged and false when the view is scrolled in the inertia
*/
public void onScrollChanged(int scrollY, boolean firstScroll, boolean dragging);
/**
* Called when the down motion event occurred.
*/
public void onDownMotionEvent();
/**
* Called when the dragging ended or canceled.
*
* @param scrollState state to indicate the scroll direction
*/
public void onUpOrCancelMotionEvent(ScrollState scrollState);
}

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OsmAnd/src/com/github/ksoichiro/android/observablescrollview/ObservableWebView.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;
/**
* WebView that its scroll position can be observed.
*/
public class ObservableWebView extends WebView implements Scrollable {
// Fields that should be saved onSaveInstanceState
private int mPrevScrollY;
private int mScrollY;
// Fields that don't need to be saved onSaveInstanceState
private ObservableScrollViewCallbacks mCallbacks;
private ScrollState mScrollState;
private boolean mFirstScroll;
private boolean mDragging;
private boolean mIntercepted;
private MotionEvent mPrevMoveEvent;
private ViewGroup mTouchInterceptionViewGroup;
public ObservableWebView(Context context) {
super(context);
}
public ObservableWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public ObservableWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void onRestoreInstanceState(Parcelable state) {
SavedState ss = (SavedState) state;
mPrevScrollY = ss.prevScrollY;
mScrollY = ss.scrollY;
super.onRestoreInstanceState(ss.getSuperState());
}
@Override
public Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState ss = new SavedState(superState);
ss.prevScrollY = mPrevScrollY;
ss.scrollY = mScrollY;
return ss;
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
if (mCallbacks != null) {
mScrollY = t;
mCallbacks.onScrollChanged(t, mFirstScroll, mDragging);
if (mFirstScroll) {
mFirstScroll = false;
}
if (mPrevScrollY < t) {
mScrollState = ScrollState.UP;
} else if (t < mPrevScrollY) {
mScrollState = ScrollState.DOWN;
} else {
mScrollState = ScrollState.STOP;
}
mPrevScrollY = t;
}
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
// Whether or not motion events are consumed by children,
// flag initializations which are related to ACTION_DOWN events should be executed.
// Because if the ACTION_DOWN is consumed by children and only ACTION_MOVEs are
// passed to parent (this view), the flags will be invalid.
// Also, applications might implement initialization codes to onDownMotionEvent,
// so call it here.
mFirstScroll = mDragging = true;
mCallbacks.onDownMotionEvent();
break;
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mCallbacks != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mIntercepted = false;
mDragging = false;
mCallbacks.onUpOrCancelMotionEvent(mScrollState);
break;
case MotionEvent.ACTION_MOVE:
if (mPrevMoveEvent == null) {
mPrevMoveEvent = ev;
}
float diffY = ev.getY() - mPrevMoveEvent.getY();
mPrevMoveEvent = MotionEvent.obtainNoHistory(ev);
if (getCurrentScrollY() - diffY <= 0) {
// Can't scroll anymore.
if (mIntercepted) {
// Already dispatched ACTION_DOWN event to parents, so stop here.
return false;
}
// Apps can set the interception target other than the direct parent.
final ViewGroup parent;
if (mTouchInterceptionViewGroup == null) {
parent = (ViewGroup) getParent();
} else {
parent = mTouchInterceptionViewGroup;
}
// Get offset to parents. If the parent is not the direct parent,
// we should aggregate offsets from all of the parents.
float offsetX = 0;
float offsetY = 0;
for (View v = this; v != null && v != parent; v = (View) v.getParent()) {
offsetX += v.getLeft() - v.getScrollX();
offsetY += v.getTop() - v.getScrollY();
}
final MotionEvent event = MotionEvent.obtainNoHistory(ev);
event.offsetLocation(offsetX, offsetY);
if (parent.onInterceptTouchEvent(event)) {
mIntercepted = true;
// If the parent wants to intercept ACTION_MOVE events,
// we pass ACTION_DOWN event to the parent
// as if these touch events just have began now.
event.setAction(MotionEvent.ACTION_DOWN);
// Return this onTouchEvent() first and set ACTION_DOWN event for parent
// to the queue, to keep events sequence.
post(new Runnable() {
@Override
public void run() {
parent.dispatchTouchEvent(event);
}
});
return false;
}
// Even when this can't be scrolled anymore,
// simply returning false here may cause subView's click,
// so delegate it to super.
return super.onTouchEvent(ev);
}
break;
}
}
return super.onTouchEvent(ev);
}
@Override
public void setScrollViewCallbacks(ObservableScrollViewCallbacks listener) {
mCallbacks = listener;
}
@Override
public void setTouchInterceptionViewGroup(ViewGroup viewGroup) {
mTouchInterceptionViewGroup = viewGroup;
}
@Override
public void scrollVerticallyTo(int y) {
scrollTo(0, y);
}
@Override
public int getCurrentScrollY() {
return mScrollY;
}
static class SavedState extends BaseSavedState {
int prevScrollY;
int scrollY;
/**
* Called by onSaveInstanceState.
*/
SavedState(Parcelable superState) {
super(superState);
}
/**
* Called by CREATOR.
*/
private SavedState(Parcel in) {
super(in);
prevScrollY = in.readInt();
scrollY = in.readInt();
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeInt(prevScrollY);
out.writeInt(scrollY);
}
public static final Parcelable.Creator<SavedState> CREATOR
= new Parcelable.Creator<SavedState>() {
@Override
public SavedState createFromParcel(Parcel in) {
return new SavedState(in);
}
@Override
public SavedState[] newArray(int size) {
return new SavedState[size];
}
};
}
}

38
OsmAnd/src/com/github/ksoichiro/android/observablescrollview/ScrollState.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
/**
* Constants that indicates the scroll state of the Scrollable widgets.
*/
public enum ScrollState {
/**
* Widget is stopped.
* This state does not always mean that this widget have never been scrolled.
*/
STOP,
/**
* Widget is scrolled up by swiping it down.
*/
UP,
/**
* Widget is scrolled down by swiping it up.
*/
DOWN,
}

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OsmAnd/src/com/github/ksoichiro/android/observablescrollview/ScrollUtils.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.os.Build;
import android.view.View;
import android.view.ViewTreeObserver;
/**
* Utilities for creating scrolling effects.
*/
public final class ScrollUtils {
private ScrollUtils() {
}
/**
* Return a float value within the range.
* This is just a wrapper for Math.min() and Math.max().
* This may be useful if you feel it confusing ("Which is min and which is max?").
*
* @param value the target value
* @param minValue minimum value. If value is less than this, minValue will be returned
* @param maxValue maximum value. If value is greater than this, maxValue will be returned
* @return float value limited to the range
*/
public static float getFloat(final float value, final float minValue, final float maxValue) {
return Math.min(maxValue, Math.max(minValue, value));
}
/**
* Create a color integer value with specified alpha.
* This may be useful to change alpha value of background color.
*
* @param alpha alpha value from 0.0f to 1.0f.
* @param baseColor base color. alpha value will be ignored.
* @return a color with alpha made from base color
*/
public static int getColorWithAlpha(float alpha, int baseColor) {
int a = Math.min(255, Math.max(0, (int) (alpha * 255))) << 24;
int rgb = 0x00ffffff & baseColor;
return a + rgb;
}
/**
* Add an OnGlobalLayoutListener for the view.
* This is just a convenience method for using {@code ViewTreeObserver.OnGlobalLayoutListener()}.
* This also handles removing listener when onGlobalLayout is called.
*
* @param view the target view to add global layout listener
* @param runnable runnable to be executed after the view is laid out
*/
public static void addOnGlobalLayoutListener(final View view, final Runnable runnable) {
ViewTreeObserver vto = view.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
view.getViewTreeObserver().removeGlobalOnLayoutListener(this);
} else {
view.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
runnable.run();
}
});
}
/**
* Mix two colors.
* {@code toColor} will be {@code toAlpha/1} percent,
* and {@code fromColor} will be {@code (1-toAlpha)/1} percent.
*
* @param fromColor first color to be mixed
* @param toColor second color to be mixed
* @param toAlpha alpha value of toColor, 0.0f to 1.0f.
* @return mixed color value in ARGB. Alpha is fixed value (255).
*/
public static int mixColors(int fromColor, int toColor, float toAlpha) {
float[] fromCmyk = ScrollUtils.cmykFromRgb(fromColor);
float[] toCmyk = ScrollUtils.cmykFromRgb(toColor);
float[] result = new float[4];
for (int i = 0; i < 4; i++) {
result[i] = Math.min(1, fromCmyk[i] * (1 - toAlpha) + toCmyk[i] * toAlpha);
}
return 0xff000000 + (0x00ffffff & ScrollUtils.rgbFromCmyk(result));
}
/**
* Convert RGB color to CMYK color.
*
* @param rgbColor target color
* @return CMYK array
*/
public static float[] cmykFromRgb(int rgbColor) {
int red = (0xff0000 & rgbColor) >> 16;
int green = (0xff00 & rgbColor) >> 8;
int blue = (0xff & rgbColor);
float black = Math.min(1.0f - red / 255.0f, Math.min(1.0f - green / 255.0f, 1.0f - blue / 255.0f));
float cyan = 1.0f;
float magenta = 1.0f;
float yellow = 1.0f;
if (black != 1.0f) {
// black 1.0 causes zero divide
cyan = (1.0f - (red / 255.0f) - black) / (1.0f - black);
magenta = (1.0f - (green / 255.0f) - black) / (1.0f - black);
yellow = (1.0f - (blue / 255.0f) - black) / (1.0f - black);
}
return new float[]{cyan, magenta, yellow, black};
}
/**
* Convert CYMK color to RGB color.
* This method doesn't check f cmyk is not null or have 4 elements in array.
*
* @param cmyk target CYMK color. Each value should be between 0.0f to 1.0f,
* and should be set in this order: cyan, magenta, yellow, black.
* @return ARGB color. Alpha is fixed value (255).
*/
public static int rgbFromCmyk(float[] cmyk) {
float cyan = cmyk[0];
float magenta = cmyk[1];
float yellow = cmyk[2];
float black = cmyk[3];
int red = (int) ((1.0f - Math.min(1.0f, cyan * (1.0f - black) + black)) * 255);
int green = (int) ((1.0f - Math.min(1.0f, magenta * (1.0f - black) + black)) * 255);
int blue = (int) ((1.0f - Math.min(1.0f, yellow * (1.0f - black) + black)) * 255);
return ((0xff & red) << 16) + ((0xff & green) << 8) + (0xff & blue);
}
}

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OsmAnd/src/com/github/ksoichiro/android/observablescrollview/Scrollable.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.view.ViewGroup;
/**
* Provides common API for observable and scrollable widgets.
*/
public interface Scrollable {
/**
* Sets a callback listener.
*
* @param listener listener to set
*/
void setScrollViewCallbacks(ObservableScrollViewCallbacks listener);
/**
* Scrolls vertically to the absolute Y.
* Implemented classes are expected to scroll to the exact Y pixels from the top,
* but it depends on the type of the widget.
*
* @param y vertical position to scroll to
*/
void scrollVerticallyTo(int y);
/**
* Returns the current Y of the scrollable view.
*
* @return current Y pixel
*/
int getCurrentScrollY();
/**
* Sets a touch motion event delegation ViewGroup.
* This is used to pass motion events back to parent view.
* It's up to the implementation classes whether or not it works.
*
* @param viewGroup ViewGroup object to dispatch motion events
*/
void setTouchInterceptionViewGroup(ViewGroup viewGroup);
}

286
OsmAnd/src/com/github/ksoichiro/android/observablescrollview/TouchInterceptionFrameLayout.java Executable file
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/*
* Copyright 2014 Soichiro Kashima
*
* 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.github.ksoichiro.android.observablescrollview;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.PointF;
import android.graphics.Rect;
import android.os.Build;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.FrameLayout;
/**
* A layout that delegates interception of touch motion events.
* This layout is provided to move the container of Scrollable views using scroll position.
* Please note that this class overrides or uses touch events API such as onTouchEvent,
* onInterceptTouchEvent and dispatchTouchEvent,
* so be careful when you handle touches with this layout.
*/
public class TouchInterceptionFrameLayout extends FrameLayout {
/**
* Callbacks for TouchInterceptionFrameLayout.
*/
public interface TouchInterceptionListener {
/**
* Determines whether the layout should intercept this event.
*
* @param ev motion event
* @param moving true if this event is ACTION_MOVE type
* @param diffX difference between previous X and current X, if moving is true
* @param diffY difference between previous Y and current Y, if moving is true
* @return true if the layout should intercept
*/
boolean shouldInterceptTouchEvent(MotionEvent ev, boolean moving, float diffX, float diffY);
/**
* Called if the down motion event is intercepted by this layout.
*
* @param ev motion event
*/
void onDownMotionEvent(MotionEvent ev);
/**
* Called if the move motion event is intercepted by this layout.
*
* @param ev motion event
* @param diffX difference between previous X and current X
* @param diffY difference between previous Y and current Y
*/
void onMoveMotionEvent(MotionEvent ev, float diffX, float diffY);
/**
* Called if the up (or cancel) motion event is intercepted by this layout.
*
* @param ev motion event
*/
void onUpOrCancelMotionEvent(MotionEvent ev);
}
private boolean mIntercepting;
private boolean mDownMotionEventPended;
private boolean mBeganFromDownMotionEvent;
private boolean mChildrenEventsCanceled;
private PointF mInitialPoint;
private MotionEvent mPendingDownMotionEvent;
private TouchInterceptionListener mTouchInterceptionListener;
public TouchInterceptionFrameLayout(Context context) {
super(context);
}
public TouchInterceptionFrameLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public TouchInterceptionFrameLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public TouchInterceptionFrameLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
public void setScrollInterceptionListener(TouchInterceptionListener listener) {
mTouchInterceptionListener = listener;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (mTouchInterceptionListener == null) {
return false;
}
// In here, we must initialize touch state variables
// and ask if we should intercept this event.
// Whether we should intercept or not is kept for the later event handling.
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mInitialPoint = new PointF(ev.getX(), ev.getY());
mPendingDownMotionEvent = MotionEvent.obtainNoHistory(ev);
mDownMotionEventPended = true;
mIntercepting = mTouchInterceptionListener.shouldInterceptTouchEvent(ev, false, 0, 0);
mBeganFromDownMotionEvent = mIntercepting;
mChildrenEventsCanceled = false;
return mIntercepting;
case MotionEvent.ACTION_MOVE:
// ACTION_MOVE will be passed suddenly, so initialize to avoid exception.
if (mInitialPoint == null) {
mInitialPoint = new PointF(ev.getX(), ev.getY());
}
// diffX and diffY are the origin of the motion, and should be difference
// from the position of the ACTION_DOWN event occurred.
float diffX = ev.getX() - mInitialPoint.x;
float diffY = ev.getY() - mInitialPoint.y;
mIntercepting = mTouchInterceptionListener.shouldInterceptTouchEvent(ev, true, diffX, diffY);
return mIntercepting;
}
return false;
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (mTouchInterceptionListener != null) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
if (mIntercepting) {
mTouchInterceptionListener.onDownMotionEvent(ev);
duplicateTouchEventForChildren(ev);
return true;
}
break;
case MotionEvent.ACTION_MOVE:
// ACTION_MOVE will be passed suddenly, so initialize to avoid exception.
if (mInitialPoint == null) {
mInitialPoint = new PointF(ev.getX(), ev.getY());
}
// diffX and diffY are the origin of the motion, and should be difference
// from the position of the ACTION_DOWN event occurred.
float diffX = ev.getX() - mInitialPoint.x;
float diffY = ev.getY() - mInitialPoint.y;
mIntercepting = mTouchInterceptionListener.shouldInterceptTouchEvent(ev, true, diffX, diffY);
if (mIntercepting) {
// If this layout didn't receive ACTION_DOWN motion event,
// we should generate ACTION_DOWN event with current position.
if (!mBeganFromDownMotionEvent) {
mBeganFromDownMotionEvent = true;
MotionEvent event = MotionEvent.obtainNoHistory(mPendingDownMotionEvent);
event.setLocation(ev.getX(), ev.getY());
mTouchInterceptionListener.onDownMotionEvent(event);
mInitialPoint = new PointF(ev.getX(), ev.getY());
diffX = diffY = 0;
}
// Children's touches should be canceled
if (!mChildrenEventsCanceled) {
mChildrenEventsCanceled = true;
duplicateTouchEventForChildren(obtainMotionEvent(ev, MotionEvent.ACTION_CANCEL));
}
mTouchInterceptionListener.onMoveMotionEvent(ev, diffX, diffY);
// If next mIntercepting become false,
// then we should generate fake ACTION_DOWN event.
// Therefore we set pending flag to true as if this is a down motion event.
mDownMotionEventPended = true;
// Whether or not this event is consumed by the listener,
// assume it consumed because we declared to intercept the event.
return true;
} else {
if (mDownMotionEventPended) {
mDownMotionEventPended = false;
MotionEvent event = MotionEvent.obtainNoHistory(mPendingDownMotionEvent);
event.setLocation(ev.getX(), ev.getY());
duplicateTouchEventForChildren(ev, event);
} else {
duplicateTouchEventForChildren(ev);
}
// If next mIntercepting become true,
// then we should generate fake ACTION_DOWN event.
// Therefore we set beganFromDownMotionEvent flag to false
// as if we haven't received a down motion event.
mBeganFromDownMotionEvent = false;
// Reserve children's click cancellation here if they've already canceled
mChildrenEventsCanceled = false;
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mBeganFromDownMotionEvent = false;
if (mIntercepting) {
mTouchInterceptionListener.onUpOrCancelMotionEvent(ev);
}
// Children's touches should be canceled regardless of
// whether or not this layout intercepted the consecutive motion events.
if (!mChildrenEventsCanceled) {
mChildrenEventsCanceled = true;
if (mDownMotionEventPended) {
mDownMotionEventPended = false;
MotionEvent event = MotionEvent.obtainNoHistory(mPendingDownMotionEvent);
event.setLocation(ev.getX(), ev.getY());
duplicateTouchEventForChildren(ev, event);
} else {
duplicateTouchEventForChildren(ev);
}
}
return true;
}
}
return super.onTouchEvent(ev);
}
private MotionEvent obtainMotionEvent(MotionEvent base, int action) {
MotionEvent ev = MotionEvent.obtainNoHistory(base);
ev.setAction(action);
return ev;
}
/**
* Duplicate touch events to child views.
* We want to dispatch a down motion event and the move events to
* child views, but calling dispatchTouchEvent() causes StackOverflowError.
* Therefore we do it manually.
*
* @param ev motion event to be passed to children
* @param pendingEvents pending events like ACTION_DOWN. This will be passed to the children before ev
*/
private void duplicateTouchEventForChildren(MotionEvent ev, MotionEvent... pendingEvents) {
if (ev == null) {
return;
}
for (int i = getChildCount() - 1; 0 <= i; i--) {
View childView = getChildAt(i);
if (childView != null) {
Rect childRect = new Rect();
childView.getHitRect(childRect);
MotionEvent event = MotionEvent.obtainNoHistory(ev);
if (!childRect.contains((int) event.getX(), (int) event.getY())) {
continue;
}
float offsetX = -childView.getLeft();
float offsetY = -childView.getTop();
boolean consumed = false;
if (pendingEvents != null) {
for (MotionEvent pe : pendingEvents) {
if (pe != null) {
MotionEvent peAdjusted = MotionEvent.obtainNoHistory(pe);
peAdjusted.offsetLocation(offsetX, offsetY);
consumed |= childView.dispatchTouchEvent(peAdjusted);
}
}
}
event.offsetLocation(offsetX, offsetY);
consumed |= childView.dispatchTouchEvent(event);
if (consumed) {
break;
}
}
}
}
}