package org.holoeverywhere.preference; import org.holoeverywhere.LayoutInflater; import org.holoeverywhere.widget.LinearLayout; import android.animation.LayoutTransition; import android.annotation.SuppressLint; import android.content.Context; import android.os.Build.VERSION; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentManager.BackStackEntry; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class FragmentBreadCrumbs extends ViewGroup implements FragmentManager.OnBackStackChangedListener { public interface OnBreadCrumbClickListener { public boolean onBreadCrumbClick(BackStackEntry backStack, int flags); } FragmentActivity mActivity; LinearLayout mContainer; LayoutInflater mInflater; int mMaxVisible = -1; private OnBreadCrumbClickListener mOnBreadCrumbClickListener; private OnClickListener mOnClickListener = new OnClickListener() { @Override public void onClick(View v) { if (v.getTag() instanceof BackStackEntry) { BackStackEntry bse = (BackStackEntry) v.getTag(); if (bse == mParentEntry) { if (mParentClickListener != null) { mParentClickListener.onClick(v); } } else { if (mOnBreadCrumbClickListener != null) { if (mOnBreadCrumbClickListener.onBreadCrumbClick( bse == mTopEntry ? null : bse, 0)) { return; } } if (bse == mTopEntry) { mActivity.getSupportFragmentManager().popBackStack(); } else { mActivity.getSupportFragmentManager().popBackStack( bse.getId(), 0); } } } } }; private OnClickListener mParentClickListener; BackStackEntry mParentEntry; BackStackEntry mTopEntry; public FragmentBreadCrumbs(Context context) { this(context, null); } public FragmentBreadCrumbs(Context context, AttributeSet attrs) { this(context, attrs, android.R.style.Widget_FragmentBreadCrumbs); } public FragmentBreadCrumbs(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } private BackStackEntry createBackStackEntry(final CharSequence title, final CharSequence shortTitle) { if (title == null) { return null; } return new BackStackEntry() { @Override public CharSequence getBreadCrumbShortTitle() { return shortTitle; } @Override public int getBreadCrumbShortTitleRes() { return 0; } @Override public CharSequence getBreadCrumbTitle() { return title; } @Override public int getBreadCrumbTitleRes() { return 0; } @Override public int getId() { return 2837452; } @Override public String getName() { return "backstackentry"; } }; } private BackStackEntry getPreEntry(int index) { if (mParentEntry != null) { return index == 0 ? mParentEntry : mTopEntry; } else { return mTopEntry; } } private int getPreEntryCount() { return (mTopEntry != null ? 1 : 0) + (mParentEntry != null ? 1 : 0); } @Override public void onBackStackChanged() { updateCrumbs(); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { final int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { final View child = getChildAt(i); int childRight = getPaddingLeft() + child.getMeasuredWidth() - getPaddingRight(); int childBottom = getPaddingTop() + child.getMeasuredHeight() - getPaddingBottom(); child.layout(getPaddingLeft(), getPaddingTop(), childRight, childBottom); } } @SuppressLint("NewApi") @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { final int count = getChildCount(); int maxHeight = 0; int maxWidth = 0; int measuredChildState = 0; for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.getVisibility() != View.GONE) { measureChild(child, widthMeasureSpec, heightMeasureSpec); maxWidth = Math.max(maxWidth, child.getMeasuredWidth()); maxHeight = Math.max(maxHeight, child.getMeasuredHeight()); if (VERSION.SDK_INT >= 11) { measuredChildState = View.combineMeasuredStates( measuredChildState, child.getMeasuredState()); } else { measuredChildState = View.combineMeasuredStates( measuredChildState, 0); } } } maxWidth += getPaddingLeft() + getPaddingRight(); maxHeight += getPaddingTop() + getPaddingBottom(); maxHeight = Math.max(maxHeight, getSuggestedMinimumHeight()); maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth()); setMeasuredDimension(View.resolveSizeAndState(maxWidth, widthMeasureSpec, measuredChildState), View.resolveSizeAndState(maxHeight, heightMeasureSpec, measuredChildState << View.MEASURED_HEIGHT_STATE_SHIFT)); } @SuppressLint("NewApi") public void setActivity(FragmentActivity a) { mActivity = a; mInflater = LayoutInflater.from(a); mContainer = (LinearLayout) mInflater.inflate( R.layout.fragment_bread_crumbs, this, false); addView(mContainer); a.getSupportFragmentManager().addOnBackStackChangedListener(this); updateCrumbs(); if (VERSION.SDK_INT >= 11) { setLayoutTransition(new LayoutTransition()); } } public void setMaxVisible(int visibleCrumbs) { if (visibleCrumbs < 1) { throw new IllegalArgumentException( "visibleCrumbs must be greater than zero"); } mMaxVisible = visibleCrumbs; } public void setOnBreadCrumbClickListener(OnBreadCrumbClickListener listener) { mOnBreadCrumbClickListener = listener; } public void setParentTitle(CharSequence title, CharSequence shortTitle, OnClickListener listener) { mParentEntry = createBackStackEntry(title, shortTitle); mParentClickListener = listener; updateCrumbs(); } public void setTitle(CharSequence title, CharSequence shortTitle) { mTopEntry = createBackStackEntry(title, shortTitle); updateCrumbs(); } void updateCrumbs() { FragmentManager fm = mActivity.getSupportFragmentManager(); int numEntries = fm.getBackStackEntryCount(); int numPreEntries = getPreEntryCount(); int numViews = mContainer.getChildCount(); for (int i = 0; i < numEntries + numPreEntries; i++) { BackStackEntry bse = i < numPreEntries ? getPreEntry(i) : fm .getBackStackEntryAt(i - numPreEntries); if (i < numViews) { View v = mContainer.getChildAt(i); Object tag = v.getTag(); if (tag != bse) { for (int j = i; j < numViews; j++) { mContainer.removeViewAt(i); } numViews = i; } } if (i >= numViews) { final View item = mInflater.inflate( R.layout.fragment_bread_crumb_item, this, false); final TextView text = (TextView) item.findViewById(R.id.title); text.setText(bse.getBreadCrumbTitle()); text.setTag(bse); if (i == 0) { item.findViewById(R.id.left_icon).setVisibility(View.GONE); } mContainer.addView(item); text.setOnClickListener(mOnClickListener); } } int viewI = numEntries + numPreEntries; numViews = mContainer.getChildCount(); while (numViews > viewI) { mContainer.removeViewAt(numViews - 1); numViews--; } for (int i = 0; i < numViews; i++) { final View child = mContainer.getChildAt(i); child.findViewById(R.id.title).setEnabled(i < numViews - 1); if (mMaxVisible > 0) { child.setVisibility(i < numViews - mMaxVisible ? View.GONE : View.VISIBLE); final View leftIcon = child.findViewById(R.id.left_icon); leftIcon.setVisibility(i > numViews - mMaxVisible && i != 0 ? View.VISIBLE : View.GONE); } } } }