| /* |
| * Copyright (C) 2011 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.internal.widget; |
| |
| import com.android.internal.R; |
| |
| import android.animation.Animator; |
| import android.animation.ObjectAnimator; |
| import android.animation.TimeInterpolator; |
| import android.app.ActionBar; |
| import android.content.Context; |
| import android.content.res.Configuration; |
| import android.content.res.TypedArray; |
| import android.graphics.drawable.Drawable; |
| import android.text.TextUtils.TruncateAt; |
| import android.view.Gravity; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.ViewParent; |
| import android.view.animation.DecelerateInterpolator; |
| import android.widget.AdapterView; |
| import android.widget.BaseAdapter; |
| import android.widget.HorizontalScrollView; |
| import android.widget.ImageView; |
| import android.widget.LinearLayout; |
| import android.widget.ListView; |
| import android.widget.Spinner; |
| import android.widget.TextView; |
| |
| /** |
| * This widget implements the dynamic action bar tab behavior that can change |
| * across different configurations or circumstances. |
| */ |
| public class ScrollingTabContainerView extends HorizontalScrollView |
| implements AdapterView.OnItemSelectedListener { |
| private static final String TAG = "ScrollingTabContainerView"; |
| Runnable mTabSelector; |
| private TabClickListener mTabClickListener; |
| |
| private LinearLayout mTabLayout; |
| private Spinner mTabSpinner; |
| private boolean mAllowCollapse; |
| |
| int mMaxTabWidth; |
| private int mContentHeight; |
| private int mSelectedTabIndex; |
| |
| protected Animator mVisibilityAnim; |
| protected final VisibilityAnimListener mVisAnimListener = new VisibilityAnimListener(); |
| |
| private static final TimeInterpolator sAlphaInterpolator = new DecelerateInterpolator(); |
| |
| private static final int FADE_DURATION = 200; |
| |
| public ScrollingTabContainerView(Context context) { |
| super(context); |
| setHorizontalScrollBarEnabled(false); |
| |
| TypedArray a = getContext().obtainStyledAttributes(null, R.styleable.ActionBar, |
| com.android.internal.R.attr.actionBarStyle, 0); |
| setContentHeight(a.getLayoutDimension(R.styleable.ActionBar_height, 0)); |
| a.recycle(); |
| |
| mTabLayout = createTabLayout(); |
| addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, |
| ViewGroup.LayoutParams.MATCH_PARENT)); |
| } |
| |
| @Override |
| public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| final int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY; |
| setFillViewport(lockedExpanded); |
| |
| final int childCount = mTabLayout.getChildCount(); |
| if (childCount > 1 && |
| (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) { |
| if (childCount > 2) { |
| mMaxTabWidth = (int) (MeasureSpec.getSize(widthMeasureSpec) * 0.4f); |
| } else { |
| mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2; |
| } |
| } else { |
| mMaxTabWidth = -1; |
| } |
| |
| heightMeasureSpec = MeasureSpec.makeMeasureSpec(mContentHeight, MeasureSpec.EXACTLY); |
| |
| final boolean canCollapse = !lockedExpanded && mAllowCollapse; |
| |
| if (canCollapse) { |
| // See if we should expand |
| mTabLayout.measure(MeasureSpec.UNSPECIFIED, heightMeasureSpec); |
| if (mTabLayout.getMeasuredWidth() > MeasureSpec.getSize(widthMeasureSpec)) { |
| performCollapse(); |
| } else { |
| performExpand(); |
| } |
| } else { |
| performExpand(); |
| } |
| |
| final int oldWidth = getMeasuredWidth(); |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| final int newWidth = getMeasuredWidth(); |
| |
| if (lockedExpanded && oldWidth != newWidth) { |
| // Recenter the tab display if we're at a new (scrollable) size. |
| setTabSelected(mSelectedTabIndex); |
| } |
| } |
| |
| /** |
| * Indicates whether this view is collapsed into a dropdown menu instead |
| * of traditional tabs. |
| * @return true if showing as a spinner |
| */ |
| private boolean isCollapsed() { |
| return mTabSpinner != null && mTabSpinner.getParent() == this; |
| } |
| |
| public void setAllowCollapse(boolean allowCollapse) { |
| mAllowCollapse = allowCollapse; |
| } |
| |
| private void performCollapse() { |
| if (isCollapsed()) return; |
| |
| if (mTabSpinner == null) { |
| mTabSpinner = createSpinner(); |
| } |
| removeView(mTabLayout); |
| addView(mTabSpinner, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, |
| ViewGroup.LayoutParams.MATCH_PARENT)); |
| if (mTabSpinner.getAdapter() == null) { |
| mTabSpinner.setAdapter(new TabAdapter()); |
| } |
| if (mTabSelector != null) { |
| removeCallbacks(mTabSelector); |
| mTabSelector = null; |
| } |
| mTabSpinner.setSelection(mSelectedTabIndex); |
| } |
| |
| private boolean performExpand() { |
| if (!isCollapsed()) return false; |
| |
| removeView(mTabSpinner); |
| addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, |
| ViewGroup.LayoutParams.MATCH_PARENT)); |
| setTabSelected(mTabSpinner.getSelectedItemPosition()); |
| return false; |
| } |
| |
| public void setTabSelected(int position) { |
| mSelectedTabIndex = position; |
| final int tabCount = mTabLayout.getChildCount(); |
| for (int i = 0; i < tabCount; i++) { |
| final View child = mTabLayout.getChildAt(i); |
| final boolean isSelected = i == position; |
| child.setSelected(isSelected); |
| if (isSelected) { |
| animateToTab(position); |
| } |
| } |
| } |
| |
| public void setContentHeight(int contentHeight) { |
| mContentHeight = contentHeight; |
| requestLayout(); |
| } |
| |
| private LinearLayout createTabLayout() { |
| final LinearLayout tabLayout = new LinearLayout(getContext(), null, |
| com.android.internal.R.attr.actionBarTabBarStyle); |
| tabLayout.setMeasureWithLargestChildEnabled(true); |
| tabLayout.setLayoutParams(new LinearLayout.LayoutParams( |
| LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT)); |
| return tabLayout; |
| } |
| |
| private Spinner createSpinner() { |
| final Spinner spinner = new Spinner(getContext(), null, |
| com.android.internal.R.attr.actionDropDownStyle); |
| spinner.setLayoutParams(new LinearLayout.LayoutParams( |
| LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT)); |
| spinner.setOnItemSelectedListener(this); |
| return spinner; |
| } |
| |
| @Override |
| protected void onConfigurationChanged(Configuration newConfig) { |
| super.onConfigurationChanged(newConfig); |
| |
| // Action bar can change size on configuration changes. |
| // Reread the desired height from the theme-specified style. |
| TypedArray a = getContext().obtainStyledAttributes(null, R.styleable.ActionBar, |
| com.android.internal.R.attr.actionBarStyle, 0); |
| setContentHeight(a.getLayoutDimension(R.styleable.ActionBar_height, 0)); |
| a.recycle(); |
| } |
| |
| public void animateToVisibility(int visibility) { |
| if (mVisibilityAnim != null) { |
| mVisibilityAnim.cancel(); |
| } |
| if (visibility == VISIBLE) { |
| if (getVisibility() != VISIBLE) { |
| setAlpha(0); |
| } |
| ObjectAnimator anim = ObjectAnimator.ofFloat(this, "alpha", 1); |
| anim.setDuration(FADE_DURATION); |
| anim.setInterpolator(sAlphaInterpolator); |
| |
| anim.addListener(mVisAnimListener.withFinalVisibility(visibility)); |
| anim.start(); |
| } else { |
| ObjectAnimator anim = ObjectAnimator.ofFloat(this, "alpha", 0); |
| anim.setDuration(FADE_DURATION); |
| anim.setInterpolator(sAlphaInterpolator); |
| |
| anim.addListener(mVisAnimListener.withFinalVisibility(visibility)); |
| anim.start(); |
| } |
| } |
| |
| public void animateToTab(final int position) { |
| final View tabView = mTabLayout.getChildAt(position); |
| if (mTabSelector != null) { |
| removeCallbacks(mTabSelector); |
| } |
| mTabSelector = new Runnable() { |
| public void run() { |
| final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2; |
| smoothScrollTo(scrollPos, 0); |
| mTabSelector = null; |
| } |
| }; |
| post(mTabSelector); |
| } |
| |
| @Override |
| public void onAttachedToWindow() { |
| super.onAttachedToWindow(); |
| if (mTabSelector != null) { |
| // Re-post the selector we saved |
| post(mTabSelector); |
| } |
| } |
| |
| @Override |
| public void onDetachedFromWindow() { |
| super.onDetachedFromWindow(); |
| if (mTabSelector != null) { |
| removeCallbacks(mTabSelector); |
| } |
| } |
| |
| private TabView createTabView(ActionBar.Tab tab, boolean forAdapter) { |
| final TabView tabView = new TabView(getContext(), tab, forAdapter); |
| if (forAdapter) { |
| tabView.setBackgroundDrawable(null); |
| tabView.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams.MATCH_PARENT, |
| mContentHeight)); |
| } else { |
| tabView.setFocusable(true); |
| |
| if (mTabClickListener == null) { |
| mTabClickListener = new TabClickListener(); |
| } |
| tabView.setOnClickListener(mTabClickListener); |
| } |
| return tabView; |
| } |
| |
| public void addTab(ActionBar.Tab tab, boolean setSelected) { |
| TabView tabView = createTabView(tab, false); |
| mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, |
| LayoutParams.MATCH_PARENT, 1)); |
| if (mTabSpinner != null) { |
| ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); |
| } |
| if (setSelected) { |
| tabView.setSelected(true); |
| } |
| if (mAllowCollapse) { |
| requestLayout(); |
| } |
| } |
| |
| public void addTab(ActionBar.Tab tab, int position, boolean setSelected) { |
| final TabView tabView = createTabView(tab, false); |
| mTabLayout.addView(tabView, position, new LinearLayout.LayoutParams( |
| 0, LayoutParams.MATCH_PARENT, 1)); |
| if (mTabSpinner != null) { |
| ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); |
| } |
| if (setSelected) { |
| tabView.setSelected(true); |
| } |
| if (mAllowCollapse) { |
| requestLayout(); |
| } |
| } |
| |
| public void updateTab(int position) { |
| ((TabView) mTabLayout.getChildAt(position)).update(); |
| if (mTabSpinner != null) { |
| ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); |
| } |
| if (mAllowCollapse) { |
| requestLayout(); |
| } |
| } |
| |
| public void removeTabAt(int position) { |
| mTabLayout.removeViewAt(position); |
| if (mTabSpinner != null) { |
| ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); |
| } |
| if (mAllowCollapse) { |
| requestLayout(); |
| } |
| } |
| |
| public void removeAllTabs() { |
| mTabLayout.removeAllViews(); |
| if (mTabSpinner != null) { |
| ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged(); |
| } |
| if (mAllowCollapse) { |
| requestLayout(); |
| } |
| } |
| |
| @Override |
| public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { |
| TabView tabView = (TabView) view; |
| tabView.getTab().select(); |
| } |
| |
| @Override |
| public void onNothingSelected(AdapterView<?> parent) { |
| } |
| |
| private class TabView extends LinearLayout { |
| private ActionBar.Tab mTab; |
| private TextView mTextView; |
| private ImageView mIconView; |
| private View mCustomView; |
| |
| public TabView(Context context, ActionBar.Tab tab, boolean forList) { |
| super(context, null, com.android.internal.R.attr.actionBarTabStyle); |
| mTab = tab; |
| |
| if (forList) { |
| setGravity(Gravity.LEFT | Gravity.CENTER_VERTICAL); |
| } |
| |
| update(); |
| } |
| |
| public void bindTab(ActionBar.Tab tab) { |
| mTab = tab; |
| update(); |
| } |
| |
| @Override |
| public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
| |
| // Re-measure if we went beyond our maximum size. |
| if (mMaxTabWidth > 0 && getMeasuredWidth() > mMaxTabWidth) { |
| super.onMeasure(MeasureSpec.makeMeasureSpec(mMaxTabWidth, MeasureSpec.EXACTLY), |
| heightMeasureSpec); |
| } |
| } |
| |
| public void update() { |
| final ActionBar.Tab tab = mTab; |
| final View custom = tab.getCustomView(); |
| if (custom != null) { |
| final ViewParent customParent = custom.getParent(); |
| if (customParent != this) { |
| if (customParent != null) ((ViewGroup) customParent).removeView(custom); |
| addView(custom); |
| } |
| mCustomView = custom; |
| if (mTextView != null) mTextView.setVisibility(GONE); |
| if (mIconView != null) { |
| mIconView.setVisibility(GONE); |
| mIconView.setImageDrawable(null); |
| } |
| } else { |
| if (mCustomView != null) { |
| removeView(mCustomView); |
| mCustomView = null; |
| } |
| |
| final Drawable icon = tab.getIcon(); |
| final CharSequence text = tab.getText(); |
| |
| if (icon != null) { |
| if (mIconView == null) { |
| ImageView iconView = new ImageView(getContext()); |
| LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, |
| LayoutParams.WRAP_CONTENT); |
| lp.gravity = Gravity.CENTER_VERTICAL; |
| iconView.setLayoutParams(lp); |
| addView(iconView, 0); |
| mIconView = iconView; |
| } |
| mIconView.setImageDrawable(icon); |
| mIconView.setVisibility(VISIBLE); |
| } else if (mIconView != null) { |
| mIconView.setVisibility(GONE); |
| mIconView.setImageDrawable(null); |
| } |
| |
| if (text != null) { |
| if (mTextView == null) { |
| TextView textView = new TextView(getContext(), null, |
| com.android.internal.R.attr.actionBarTabTextStyle); |
| textView.setEllipsize(TruncateAt.END); |
| LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, |
| LayoutParams.WRAP_CONTENT); |
| lp.gravity = Gravity.CENTER_VERTICAL; |
| textView.setLayoutParams(lp); |
| addView(textView); |
| mTextView = textView; |
| } |
| mTextView.setText(text); |
| mTextView.setVisibility(VISIBLE); |
| } else if (mTextView != null) { |
| mTextView.setVisibility(GONE); |
| mTextView.setText(null); |
| } |
| |
| if (mIconView != null) { |
| mIconView.setContentDescription(tab.getContentDescription()); |
| } |
| } |
| } |
| |
| public ActionBar.Tab getTab() { |
| return mTab; |
| } |
| } |
| |
| private class TabAdapter extends BaseAdapter { |
| @Override |
| public int getCount() { |
| return mTabLayout.getChildCount(); |
| } |
| |
| @Override |
| public Object getItem(int position) { |
| return ((TabView) mTabLayout.getChildAt(position)).getTab(); |
| } |
| |
| @Override |
| public long getItemId(int position) { |
| return position; |
| } |
| |
| @Override |
| public View getView(int position, View convertView, ViewGroup parent) { |
| if (convertView == null) { |
| convertView = createTabView((ActionBar.Tab) getItem(position), true); |
| } else { |
| ((TabView) convertView).bindTab((ActionBar.Tab) getItem(position)); |
| } |
| return convertView; |
| } |
| } |
| |
| private class TabClickListener implements OnClickListener { |
| public void onClick(View view) { |
| TabView tabView = (TabView) view; |
| tabView.getTab().select(); |
| final int tabCount = mTabLayout.getChildCount(); |
| for (int i = 0; i < tabCount; i++) { |
| final View child = mTabLayout.getChildAt(i); |
| child.setSelected(child == view); |
| } |
| } |
| } |
| |
| protected class VisibilityAnimListener implements Animator.AnimatorListener { |
| private boolean mCanceled = false; |
| private int mFinalVisibility; |
| |
| public VisibilityAnimListener withFinalVisibility(int visibility) { |
| mFinalVisibility = visibility; |
| return this; |
| } |
| |
| @Override |
| public void onAnimationStart(Animator animation) { |
| setVisibility(VISIBLE); |
| mVisibilityAnim = animation; |
| mCanceled = false; |
| } |
| |
| @Override |
| public void onAnimationEnd(Animator animation) { |
| if (mCanceled) return; |
| |
| mVisibilityAnim = null; |
| setVisibility(mFinalVisibility); |
| } |
| |
| @Override |
| public void onAnimationCancel(Animator animation) { |
| mCanceled = true; |
| } |
| |
| @Override |
| public void onAnimationRepeat(Animator animation) { |
| } |
| } |
| } |