git.gag.com Git - debian/openrocket/blob - android-libraries/ActionBarSherlock/src/com/actionbarsherlock/internal/widget/ScrollingTabContainerView.java

   1 /*
   2  * Copyright (C) 2011 The Android Open Source Project
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.actionbarsherlock.internal.widget;
  17
  18 import android.content.Context;
  19 import android.content.res.Configuration;
  20 import android.content.res.TypedArray;
  21 import android.graphics.drawable.Drawable;
  22 import android.text.TextUtils.TruncateAt;
  23 import android.util.AttributeSet;
  24 import android.view.Gravity;
  25 import android.view.LayoutInflater;
  26 import android.view.View;
  27 import android.view.ViewGroup;
  28 import android.view.ViewParent;
  29 import android.view.animation.DecelerateInterpolator;
  30 import android.view.animation.Interpolator;
  31 import android.widget.BaseAdapter;
  32 import android.widget.ImageView;
  33 import android.widget.LinearLayout;
  34 import android.widget.ListView;
  35 import com.actionbarsherlock.R;
  36 import com.actionbarsherlock.app.ActionBar;
  37 import com.actionbarsherlock.internal.nineoldandroids.animation.Animator;
  38 import com.actionbarsherlock.internal.nineoldandroids.animation.ObjectAnimator;
  39 import com.actionbarsherlock.internal.nineoldandroids.widget.NineHorizontalScrollView;
  40
  41 /**
  42  * This widget implements the dynamic action bar tab behavior that can change
  43  * across different configurations or circumstances.
  44  */
  45 public class ScrollingTabContainerView extends NineHorizontalScrollView
  46         implements IcsAdapterView.OnItemSelectedListener {
  47     //UNUSED private static final String TAG = "ScrollingTabContainerView";
  48     Runnable mTabSelector;
  49     private TabClickListener mTabClickListener;
  50
  51     private IcsLinearLayout mTabLayout;
  52     private IcsSpinner mTabSpinner;
  53     private boolean mAllowCollapse;
  54
  55     private LayoutInflater mInflater;
  56
  57     int mMaxTabWidth;
  58     private int mContentHeight;
  59     private int mSelectedTabIndex;
  60
  61     protected Animator mVisibilityAnim;
  62     protected final VisibilityAnimListener mVisAnimListener = new VisibilityAnimListener();
  63
  64     private static final /*Time*/Interpolator sAlphaInterpolator = new DecelerateInterpolator();
  65
  66     private static final int FADE_DURATION = 200;
  67
  68     public ScrollingTabContainerView(Context context) {
  69         super(context);
  70         setHorizontalScrollBarEnabled(false);
  71
  72         TypedArray a = getContext().obtainStyledAttributes(null, R.styleable.SherlockActionBar,
  73                 R.attr.actionBarStyle, 0);
  74         setContentHeight(a.getLayoutDimension(R.styleable.SherlockActionBar_height, 0));
  75         a.recycle();
  76
  77         mInflater = LayoutInflater.from(context);
  78
  79         mTabLayout = createTabLayout();
  80         addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
  81                 ViewGroup.LayoutParams.MATCH_PARENT));
  82     }
  83
  84     @Override
  85     public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  86         final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
  87         final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY;
  88         setFillViewport(lockedExpanded);
  89
  90         final int childCount = mTabLayout.getChildCount();
  91         if (childCount > 1 &&
  92                 (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) {
  93             if (childCount > 2) {
  94                 mMaxTabWidth = (int) (MeasureSpec.getSize(widthMeasureSpec) * 0.4f);
  95             } else {
  96                 mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2;
  97             }
  98         } else {
  99             mMaxTabWidth = -1;
 100         }
 101
 102         heightMeasureSpec = MeasureSpec.makeMeasureSpec(mContentHeight, MeasureSpec.EXACTLY);
 103
 104         final boolean canCollapse = !lockedExpanded && mAllowCollapse;
 105
 106         if (canCollapse) {
 107             // See if we should expand
 108             mTabLayout.measure(MeasureSpec.UNSPECIFIED, heightMeasureSpec);
 109             if (mTabLayout.getMeasuredWidth() > MeasureSpec.getSize(widthMeasureSpec)) {
 110                 performCollapse();
 111             } else {
 112                 performExpand();
 113             }
 114         } else {
 115             performExpand();
 116         }
 117
 118         final int oldWidth = getMeasuredWidth();
 119         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 120         final int newWidth = getMeasuredWidth();
 121
 122         if (lockedExpanded && oldWidth != newWidth) {
 123             // Recenter the tab display if we're at a new (scrollable) size.
 124             setTabSelected(mSelectedTabIndex);
 125         }
 126     }
 127
 128     /**
 129      * Indicates whether this view is collapsed into a dropdown menu instead
 130      * of traditional tabs.
 131      * @return true if showing as a spinner
 132      */
 133     private boolean isCollapsed() {
 134         return mTabSpinner != null && mTabSpinner.getParent() == this;
 135     }
 136
 137     public void setAllowCollapse(boolean allowCollapse) {
 138         mAllowCollapse = allowCollapse;
 139     }
 140
 141     private void performCollapse() {
 142         if (isCollapsed()) return;
 143
 144         if (mTabSpinner == null) {
 145             mTabSpinner = createSpinner();
 146         }
 147         removeView(mTabLayout);
 148         addView(mTabSpinner, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
 149                 ViewGroup.LayoutParams.MATCH_PARENT));
 150         if (mTabSpinner.getAdapter() == null) {
 151             mTabSpinner.setAdapter(new TabAdapter());
 152         }
 153         if (mTabSelector != null) {
 154             removeCallbacks(mTabSelector);
 155             mTabSelector = null;
 156         }
 157         mTabSpinner.setSelection(mSelectedTabIndex);
 158     }
 159
 160     private boolean performExpand() {
 161         if (!isCollapsed()) return false;
 162
 163         removeView(mTabSpinner);
 164         addView(mTabLayout, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
 165                 ViewGroup.LayoutParams.MATCH_PARENT));
 166         setTabSelected(mTabSpinner.getSelectedItemPosition());
 167         return false;
 168     }
 169
 170     public void setTabSelected(int position) {
 171         mSelectedTabIndex = position;
 172         final int tabCount = mTabLayout.getChildCount();
 173         for (int i = 0; i < tabCount; i++) {
 174             final View child = mTabLayout.getChildAt(i);
 175             final boolean isSelected = i == position;
 176             child.setSelected(isSelected);
 177             if (isSelected) {
 178                 animateToTab(position);
 179             }
 180         }
 181     }
 182
 183     public void setContentHeight(int contentHeight) {
 184         mContentHeight = contentHeight;
 185         requestLayout();
 186     }
 187
 188     private IcsLinearLayout createTabLayout() {
 189         final IcsLinearLayout tabLayout = (IcsLinearLayout) LayoutInflater.from(getContext())
 190                 .inflate(R.layout.abs__action_bar_tab_bar_view, null);
 191         tabLayout.setLayoutParams(new LinearLayout.LayoutParams(
 192                 LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT));
 193         return tabLayout;
 194     }
 195
 196     private IcsSpinner createSpinner() {
 197         final IcsSpinner spinner = new IcsSpinner(getContext(), null,
 198                 R.attr.actionDropDownStyle);
 199         spinner.setLayoutParams(new LinearLayout.LayoutParams(
 200                 LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.MATCH_PARENT));
 201         spinner.setOnItemSelectedListener(this);
 202         return spinner;
 203     }
 204
 205     @Override
 206     protected void onConfigurationChanged(Configuration newConfig) {
 207         super.onConfigurationChanged(newConfig);
 208
 209         // Action bar can change size on configuration changes.
 210         // Reread the desired height from the theme-specified style.
 211         TypedArray a = getContext().obtainStyledAttributes(null, R.styleable.SherlockActionBar,
 212                 R.attr.actionBarStyle, 0);
 213         setContentHeight(a.getLayoutDimension(R.styleable.SherlockActionBar_height, 0));
 214         a.recycle();
 215     }
 216
 217     public void animateToVisibility(int visibility) {
 218         if (mVisibilityAnim != null) {
 219             mVisibilityAnim.cancel();
 220         }
 221         if (visibility == VISIBLE) {
 222             if (getVisibility() != VISIBLE) {
 223                 setAlpha(0);
 224             }
 225             ObjectAnimator anim = ObjectAnimator.ofFloat(this, "alpha", 1);
 226             anim.setDuration(FADE_DURATION);
 227             anim.setInterpolator(sAlphaInterpolator);
 228
 229             anim.addListener(mVisAnimListener.withFinalVisibility(visibility));
 230             anim.start();
 231         } else {
 232             ObjectAnimator anim = ObjectAnimator.ofFloat(this, "alpha", 0);
 233             anim.setDuration(FADE_DURATION);
 234             anim.setInterpolator(sAlphaInterpolator);
 235
 236             anim.addListener(mVisAnimListener.withFinalVisibility(visibility));
 237             anim.start();
 238         }
 239     }
 240
 241     public void animateToTab(final int position) {
 242         final View tabView = mTabLayout.getChildAt(position);
 243         if (mTabSelector != null) {
 244             removeCallbacks(mTabSelector);
 245         }
 246         mTabSelector = new Runnable() {
 247             public void run() {
 248                 final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2;
 249                 smoothScrollTo(scrollPos, 0);
 250                 mTabSelector = null;
 251             }
 252         };
 253         post(mTabSelector);
 254     }
 255
 256     @Override
 257     public void onAttachedToWindow() {
 258         super.onAttachedToWindow();
 259         if (mTabSelector != null) {
 260             // Re-post the selector we saved
 261             post(mTabSelector);
 262         }
 263     }
 264
 265     @Override
 266     public void onDetachedFromWindow() {
 267         super.onDetachedFromWindow();
 268         if (mTabSelector != null) {
 269             removeCallbacks(mTabSelector);
 270         }
 271     }
 272
 273     private TabView createTabView(ActionBar.Tab tab, boolean forAdapter) {
 274         //Workaround for not being able to pass a defStyle on pre-3.0
 275         final TabView tabView = (TabView)mInflater.inflate(R.layout.abs__action_bar_tab, null);
 276         tabView.init(this, tab, forAdapter);
 277
 278         if (forAdapter) {
 279             tabView.setBackgroundDrawable(null);
 280             tabView.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams.MATCH_PARENT,
 281                     mContentHeight));
 282         } else {
 283             tabView.setFocusable(true);
 284
 285             if (mTabClickListener == null) {
 286                 mTabClickListener = new TabClickListener();
 287             }
 288             tabView.setOnClickListener(mTabClickListener);
 289         }
 290         return tabView;
 291     }
 292
 293     public void addTab(ActionBar.Tab tab, boolean setSelected) {
 294         TabView tabView = createTabView(tab, false);
 295         mTabLayout.addView(tabView, new IcsLinearLayout.LayoutParams(0,
 296                 LayoutParams.MATCH_PARENT, 1));
 297         if (mTabSpinner != null) {
 298             ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged();
 299         }
 300         if (setSelected) {
 301             tabView.setSelected(true);
 302         }
 303         if (mAllowCollapse) {
 304             requestLayout();
 305         }
 306     }
 307
 308     public void addTab(ActionBar.Tab tab, int position, boolean setSelected) {
 309         final TabView tabView = createTabView(tab, false);
 310         mTabLayout.addView(tabView, position, new IcsLinearLayout.LayoutParams(
 311                 0, LayoutParams.MATCH_PARENT, 1));
 312         if (mTabSpinner != null) {
 313             ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged();
 314         }
 315         if (setSelected) {
 316             tabView.setSelected(true);
 317         }
 318         if (mAllowCollapse) {
 319             requestLayout();
 320         }
 321     }
 322
 323     public void updateTab(int position) {
 324         ((TabView) mTabLayout.getChildAt(position)).update();
 325         if (mTabSpinner != null) {
 326             ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged();
 327         }
 328         if (mAllowCollapse) {
 329             requestLayout();
 330         }
 331     }
 332
 333     public void removeTabAt(int position) {
 334         mTabLayout.removeViewAt(position);
 335         if (mTabSpinner != null) {
 336             ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged();
 337         }
 338         if (mAllowCollapse) {
 339             requestLayout();
 340         }
 341     }
 342
 343     public void removeAllTabs() {
 344         mTabLayout.removeAllViews();
 345         if (mTabSpinner != null) {
 346             ((TabAdapter) mTabSpinner.getAdapter()).notifyDataSetChanged();
 347         }
 348         if (mAllowCollapse) {
 349             requestLayout();
 350         }
 351     }
 352
 353     @Override
 354     public void onItemSelected(IcsAdapterView<?> parent, View view, int position, long id) {
 355         TabView tabView = (TabView) view;
 356         tabView.getTab().select();
 357     }
 358
 359     @Override
 360     public void onNothingSelected(IcsAdapterView<?> parent) {
 361     }
 362
 363     public static class TabView extends LinearLayout {
 364         private ScrollingTabContainerView mParent;
 365         private ActionBar.Tab mTab;
 366         private CapitalizingTextView mTextView;
 367         private ImageView mIconView;
 368         private View mCustomView;
 369
 370         public TabView(Context context, AttributeSet attrs) {
 371             //TODO super(context, null, R.attr.actionBarTabStyle);
 372             super(context, attrs);
 373         }
 374
 375         public void init(ScrollingTabContainerView parent, ActionBar.Tab tab, boolean forList) {
 376             mParent = parent;
 377             mTab = tab;
 378
 379             if (forList) {
 380                 setGravity(Gravity.LEFT | Gravity.CENTER_VERTICAL);
 381             }
 382
 383             update();
 384         }
 385
 386         public void bindTab(ActionBar.Tab tab) {
 387             mTab = tab;
 388             update();
 389         }
 390
 391         @Override
 392         public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 393             super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 394
 395             // Re-measure if we went beyond our maximum size.
 396             if (mParent.mMaxTabWidth > 0 && getMeasuredWidth() > mParent.mMaxTabWidth) {
 397                 super.onMeasure(MeasureSpec.makeMeasureSpec(mParent.mMaxTabWidth, MeasureSpec.EXACTLY),
 398                         heightMeasureSpec);
 399             }
 400         }
 401
 402         public void update() {
 403             final ActionBar.Tab tab = mTab;
 404             final View custom = tab.getCustomView();
 405             if (custom != null) {
 406                 final ViewParent customParent = custom.getParent();
 407                 if (customParent != this) {
 408                     if (customParent != null) ((ViewGroup) customParent).removeView(custom);
 409                     addView(custom);
 410                 }
 411                 mCustomView = custom;
 412                 if (mTextView != null) mTextView.setVisibility(GONE);
 413                 if (mIconView != null) {
 414                     mIconView.setVisibility(GONE);
 415                     mIconView.setImageDrawable(null);
 416                 }
 417             } else {
 418                 if (mCustomView != null) {
 419                     removeView(mCustomView);
 420                     mCustomView = null;
 421                 }
 422
 423                 final Drawable icon = tab.getIcon();
 424                 final CharSequence text = tab.getText();
 425
 426                 if (icon != null) {
 427                     if (mIconView == null) {
 428                         ImageView iconView = new ImageView(getContext());
 429                         LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT,
 430                                 LayoutParams.WRAP_CONTENT);
 431                         lp.gravity = Gravity.CENTER_VERTICAL;
 432                         iconView.setLayoutParams(lp);
 433                         addView(iconView, 0);
 434                         mIconView = iconView;
 435                     }
 436                     mIconView.setImageDrawable(icon);
 437                     mIconView.setVisibility(VISIBLE);
 438                 } else if (mIconView != null) {
 439                     mIconView.setVisibility(GONE);
 440                     mIconView.setImageDrawable(null);
 441                 }
 442
 443                 if (text != null) {
 444                     if (mTextView == null) {
 445                         CapitalizingTextView textView = new CapitalizingTextView(getContext(), null,
 446                                 R.attr.actionBarTabTextStyle);
 447                         textView.setEllipsize(TruncateAt.END);
 448                         LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT,
 449                                 LayoutParams.WRAP_CONTENT);
 450                         lp.gravity = Gravity.CENTER_VERTICAL;
 451                         textView.setLayoutParams(lp);
 452                         addView(textView);
 453                         mTextView = textView;
 454                     }
 455                     mTextView.setTextCompat(text);
 456                     mTextView.setVisibility(VISIBLE);
 457                 } else if (mTextView != null) {
 458                     mTextView.setVisibility(GONE);
 459                     mTextView.setText(null);
 460                 }
 461
 462                 if (mIconView != null) {
 463                     mIconView.setContentDescription(tab.getContentDescription());
 464                 }
 465             }
 466         }
 467
 468         public ActionBar.Tab getTab() {
 469             return mTab;
 470         }
 471     }
 472
 473     private class TabAdapter extends BaseAdapter {
 474         @Override
 475         public int getCount() {
 476             return mTabLayout.getChildCount();
 477         }
 478
 479         @Override
 480         public Object getItem(int position) {
 481             return ((TabView) mTabLayout.getChildAt(position)).getTab();
 482         }
 483
 484         @Override
 485         public long getItemId(int position) {
 486             return position;
 487         }
 488
 489         @Override
 490         public View getView(int position, View convertView, ViewGroup parent) {
 491             if (convertView == null) {
 492                 convertView = createTabView((ActionBar.Tab) getItem(position), true);
 493             } else {
 494                 ((TabView) convertView).bindTab((ActionBar.Tab) getItem(position));
 495             }
 496             return convertView;
 497         }
 498     }
 499
 500     private class TabClickListener implements OnClickListener {
 501         public void onClick(View view) {
 502             TabView tabView = (TabView) view;
 503             tabView.getTab().select();
 504             final int tabCount = mTabLayout.getChildCount();
 505             for (int i = 0; i < tabCount; i++) {
 506                 final View child = mTabLayout.getChildAt(i);
 507                 child.setSelected(child == view);
 508             }
 509         }
 510     }
 511
 512     protected class VisibilityAnimListener implements Animator.AnimatorListener {
 513         private boolean mCanceled = false;
 514         private int mFinalVisibility;
 515
 516         public VisibilityAnimListener withFinalVisibility(int visibility) {
 517             mFinalVisibility = visibility;
 518             return this;
 519         }
 520
 521         @Override
 522         public void onAnimationStart(Animator animation) {
 523             setVisibility(VISIBLE);
 524             mVisibilityAnim = animation;
 525             mCanceled = false;
 526         }
 527
 528         @Override
 529         public void onAnimationEnd(Animator animation) {
 530             if (mCanceled) return;
 531
 532             mVisibilityAnim = null;
 533             setVisibility(mFinalVisibility);
 534         }
 535
 536         @Override
 537         public void onAnimationCancel(Animator animation) {
 538             mCanceled = true;
 539         }
 540
 541         @Override
 542         public void onAnimationRepeat(Animator animation) {
 543         }
 544     }
 545 }