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package se.emilsjolander.stickylistheaders;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.os.Build;
import android.view.View;
import android.widget.AbsListView;
import android.widget.ListView;
class WrapperViewList extends ListView {
interface LifeCycleListener {
void onDispatchDrawOccurred(Canvas canvas);
}
private LifeCycleListener mLifeCycleListener;
private List<View> mFooterViews;
private int mTopClippingLength;
private Rect mSelectorRect = new Rect();// for if reflection fails
private Field mSelectorPositionField;
private boolean mClippingToPadding = true;
public WrapperViewList(Context context) {
super(context);
// Use reflection to be able to change the size/position of the list
// selector so it does not come under/over the header
try {
Field selectorRectField = AbsListView.class.getDeclaredField("mSelectorRect");
selectorRectField.setAccessible(true);
mSelectorRect = (Rect) selectorRectField.get(this);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
mSelectorPositionField = AbsListView.class.getDeclaredField("mSelectorPosition");
mSelectorPositionField.setAccessible(true);
}
} catch (NoSuchFieldException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
@Override
public boolean performItemClick(View view, int position, long id) {
if (view instanceof WrapperView) {
view = ((WrapperView) view).mItem;
}
return super.performItemClick(view, position, id);
}
private void positionSelectorRect() {
if (!mSelectorRect.isEmpty()) {
int selectorPosition = getSelectorPosition();
if (selectorPosition >= 0) {
int firstVisibleItem = getFixedFirstVisibleItem();
View v = getChildAt(selectorPosition - firstVisibleItem);
if (v instanceof WrapperView) {
WrapperView wrapper = ((WrapperView) v);
mSelectorRect.top = wrapper.getTop() + wrapper.mItemTop;
}
}
}
}
private int getSelectorPosition() {
if (mSelectorPositionField == null) { // not all supported andorid
// version have this variable
for (int i = 0; i < getChildCount(); i++) {
if (getChildAt(i).getBottom() == mSelectorRect.bottom) {
return i + getFixedFirstVisibleItem();
}
}
} else {
try {
return mSelectorPositionField.getInt(this);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
return -1;
}
@Override
protected void dispatchDraw(Canvas canvas) {
positionSelectorRect();
if (mTopClippingLength != 0) {
canvas.save();
Rect clipping = canvas.getClipBounds();
clipping.top = mTopClippingLength;
canvas.clipRect(clipping);
super.dispatchDraw(canvas);
canvas.restore();
} else {
super.dispatchDraw(canvas);
}
mLifeCycleListener.onDispatchDrawOccurred(canvas);
}
void setLifeCycleListener(LifeCycleListener lifeCycleListener) {
mLifeCycleListener = lifeCycleListener;
}
@Override
public void addFooterView(View v) {
super.addFooterView(v);
if (mFooterViews == null) {
mFooterViews = new ArrayList<View>();
}
mFooterViews.add(v);
}
@Override
public boolean removeFooterView(View v) {
if (super.removeFooterView(v)) {
mFooterViews.remove(v);
return true;
}
return false;
}
boolean containsFooterView(View v) {
if (mFooterViews == null) {
return false;
}
return mFooterViews.contains(v);
}
void setTopClippingLength(int topClipping) {
mTopClippingLength = topClipping;
}
int getFixedFirstVisibleItem() {
int firstVisibleItem = getFirstVisiblePosition();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
return firstVisibleItem;
}
// first getFirstVisiblePosition() reports items
// outside the view sometimes on old versions of android
for (int i = 0; i < getChildCount(); i++) {
if (getChildAt(i).getBottom() >= 0) {
firstVisibleItem += i;
break;
}
}
// work around to fix bug with firstVisibleItem being to high
// because list view does not take clipToPadding=false into account
// on old versions of android
if (!mClippingToPadding && getPaddingTop() > 0 && firstVisibleItem > 0) {
if (getChildAt(0).getTop() > 0) {
firstVisibleItem -= 1;
}
}
return firstVisibleItem;
}
@Override
public void setClipToPadding(boolean clipToPadding) {
mClippingToPadding = clipToPadding;
super.setClipToPadding(clipToPadding);
}
}
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