core/java/com/android/internal/widget/ScrollingTabContainerView.java - platform/frameworks/base - Gitiles

 /*
  * 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 android.animation.Animator;
 import android.animation.ObjectAnimator;
 import android.animation.TimeInterpolator;
 import android.app.ActionBar;
 import android.content.Context;
 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.animation.DecelerateInterpolator;
 import android.widget.HorizontalScrollView;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;

 public class ScrollingTabContainerView extends HorizontalScrollView {
     Runnable mTabSelector;
     private TabClickListener mTabClickListener;

     private LinearLayout mTabLayout;

     int mMaxTabWidth;

     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);
     }

     @Override
     public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
         setFillViewport(widthMode == MeasureSpec.EXACTLY);

         final int childCount = 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;
         }

         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }

     public void setTabSelected(int position) {
         if (mTabLayout == null) {
             return;
         }

         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 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(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);
     }

     public void setTabLayout(LinearLayout tabLayout) {
         if (mTabLayout != tabLayout) {
             if (mTabLayout != null) {
                 ((ViewGroup) mTabLayout.getParent()).removeView(mTabLayout);
             }
             if (tabLayout != null) {
                 addView(tabLayout);
             }
             mTabLayout = tabLayout;
         }
     }

     public LinearLayout getTabLayout() {
         return mTabLayout;
     }

     @Override
     public void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         if (mTabSelector != null) {
             removeCallbacks(mTabSelector);
         }
     }

     private TabView createTabView(ActionBar.Tab tab) {
         final TabView tabView = new TabView(getContext(), tab);
         tabView.setFocusable(true);

         if (mTabClickListener == null) {
             mTabClickListener = new TabClickListener();
         }
         tabView.setOnClickListener(mTabClickListener);
         return tabView;
     }

     public void addTab(ActionBar.Tab tab, boolean setSelected) {
         View tabView = createTabView(tab);
         mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0,
                 LayoutParams.MATCH_PARENT, 1));
         if (setSelected) {
             tabView.setSelected(true);
         }
     }

     public void addTab(ActionBar.Tab tab, int position, boolean setSelected) {
         final TabView tabView = createTabView(tab);
         mTabLayout.addView(tabView, position, new LinearLayout.LayoutParams(
                 0, LayoutParams.MATCH_PARENT, 1));
         if (setSelected) {
             tabView.setSelected(true);
         }
     }

     public void updateTab(int position) {
         ((TabView) mTabLayout.getChildAt(position)).update();
     }

     public void removeTabAt(int position) {
         if (mTabLayout != null) {
             mTabLayout.removeViewAt(position);
         }
     }

     public void removeAllTabs() {
         if (mTabLayout != null) {
             mTabLayout.removeAllViews();
         }
     }

     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) {
             super(context, null, com.android.internal.R.attr.actionBarTabStyle);
             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) {
                 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);
                 }
             }
         }

         public ActionBar.Tab getTab() {
             return mTab;
         }
     }

     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) {
         }
     }
 }
	/*
	* 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 android.animation.Animator;
	import android.animation.ObjectAnimator;
	import android.animation.TimeInterpolator;
	import android.app.ActionBar;
	import android.content.Context;
	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.animation.DecelerateInterpolator;
	import android.widget.HorizontalScrollView;
	import android.widget.ImageView;
	import android.widget.LinearLayout;
	import android.widget.TextView;

	public class ScrollingTabContainerView extends HorizontalScrollView {
	Runnable mTabSelector;
	private TabClickListener mTabClickListener;

	private LinearLayout mTabLayout;

	int mMaxTabWidth;

	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);
	}

	@Override
	public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
	setFillViewport(widthMode == MeasureSpec.EXACTLY);

	final int childCount = 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;
	}

	super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}

	public void setTabSelected(int position) {
	if (mTabLayout == null) {
	return;
	}

	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 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(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);
	}

	public void setTabLayout(LinearLayout tabLayout) {
	if (mTabLayout != tabLayout) {
	if (mTabLayout != null) {
	((ViewGroup) mTabLayout.getParent()).removeView(mTabLayout);
	}
	if (tabLayout != null) {
	addView(tabLayout);
	}
	mTabLayout = tabLayout;
	}
	}

	public LinearLayout getTabLayout() {
	return mTabLayout;
	}

	@Override
	public void onDetachedFromWindow() {
	super.onDetachedFromWindow();
	if (mTabSelector != null) {
	removeCallbacks(mTabSelector);
	}
	}

	private TabView createTabView(ActionBar.Tab tab) {
	final TabView tabView = new TabView(getContext(), tab);
	tabView.setFocusable(true);

	if (mTabClickListener == null) {
	mTabClickListener = new TabClickListener();
	}
	tabView.setOnClickListener(mTabClickListener);
	return tabView;
	}

	public void addTab(ActionBar.Tab tab, boolean setSelected) {
	View tabView = createTabView(tab);
	mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0,
	LayoutParams.MATCH_PARENT, 1));
	if (setSelected) {
	tabView.setSelected(true);
	}
	}

	public void addTab(ActionBar.Tab tab, int position, boolean setSelected) {
	final TabView tabView = createTabView(tab);
	mTabLayout.addView(tabView, position, new LinearLayout.LayoutParams(
	0, LayoutParams.MATCH_PARENT, 1));
	if (setSelected) {
	tabView.setSelected(true);
	}
	}

	public void updateTab(int position) {
	((TabView) mTabLayout.getChildAt(position)).update();
	}

	public void removeTabAt(int position) {
	if (mTabLayout != null) {
	mTabLayout.removeViewAt(position);
	}
	}

	public void removeAllTabs() {
	if (mTabLayout != null) {
	mTabLayout.removeAllViews();
	}
	}

	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) {
	super(context, null, com.android.internal.R.attr.actionBarTabStyle);
	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) {
	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);
	}
	}
	}

	public ActionBar.Tab getTab() {
	return mTab;
	}
	}

	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) {
	}
	}
	}