Java tutorial
/* 50AH-code ========= 50 Android Hacks (http://manning.com/sessa/) book source code Copyright (c) 2012 Manning Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* * Copyright (C) 2010 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.actionbarsherlock.internal.widget; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import com.actionbarsherlock.R; import com.actionbarsherlock.app.ActionBar; import com.actionbarsherlock.internal.nineoldandroids.widget.NineFrameLayout; /** * This class acts as a container for the action bar view and action mode context views. * It applies special styles as needed to help handle animated transitions between them. * @hide */ public class ActionBarContainer extends NineFrameLayout { private boolean mIsTransitioning; private View mTabContainer; private ActionBarView mActionBarView; private Drawable mBackground; private Drawable mStackedBackground; private Drawable mSplitBackground; private boolean mIsSplit; private boolean mIsStacked; public ActionBarContainer(Context context) { this(context, null); } public ActionBarContainer(Context context, AttributeSet attrs) { super(context, attrs); setBackgroundDrawable(null); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SherlockActionBar); mBackground = a.getDrawable(R.styleable.SherlockActionBar_background); mStackedBackground = a.getDrawable(R.styleable.SherlockActionBar_backgroundStacked); if (getId() == R.id.abs__split_action_bar) { mIsSplit = true; mSplitBackground = a.getDrawable(R.styleable.SherlockActionBar_backgroundSplit); } a.recycle(); setWillNotDraw(mIsSplit ? mSplitBackground == null : mBackground == null && mStackedBackground == null); } @Override public void onFinishInflate() { super.onFinishInflate(); mActionBarView = (ActionBarView) findViewById(R.id.abs__action_bar); } public void setPrimaryBackground(Drawable bg) { mBackground = bg; invalidate(); } public void setStackedBackground(Drawable bg) { mStackedBackground = bg; invalidate(); } public void setSplitBackground(Drawable bg) { mSplitBackground = bg; invalidate(); } /** * Set the action bar into a "transitioning" state. While transitioning * the bar will block focus and touch from all of its descendants. This * prevents the user from interacting with the bar while it is animating * in or out. * * @param isTransitioning true if the bar is currently transitioning, false otherwise. */ public void setTransitioning(boolean isTransitioning) { mIsTransitioning = isTransitioning; setDescendantFocusability(isTransitioning ? FOCUS_BLOCK_DESCENDANTS : FOCUS_AFTER_DESCENDANTS); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { return mIsTransitioning || super.onInterceptTouchEvent(ev); } @Override public boolean onTouchEvent(MotionEvent ev) { super.onTouchEvent(ev); // An action bar always eats touch events. return true; } @Override public boolean onHoverEvent(MotionEvent ev) { super.onHoverEvent(ev); // An action bar always eats hover events. return true; } public void setTabContainer(ScrollingTabContainerView tabView) { if (mTabContainer != null) { removeView(mTabContainer); } mTabContainer = tabView; if (tabView != null) { addView(tabView); final ViewGroup.LayoutParams lp = tabView.getLayoutParams(); lp.width = LayoutParams.MATCH_PARENT; lp.height = LayoutParams.WRAP_CONTENT; tabView.setAllowCollapse(false); } } public View getTabContainer() { return mTabContainer; } @Override public void onDraw(Canvas canvas) { if (getWidth() == 0 || getHeight() == 0) { return; } if (mIsSplit) { if (mSplitBackground != null) mSplitBackground.draw(canvas); } else { if (mBackground != null) { mBackground.draw(canvas); } if (mStackedBackground != null && mIsStacked) { mStackedBackground.draw(canvas); } } } //This causes the animation reflection to fail on pre-HC platforms //@Override //public android.view.ActionMode startActionModeForChild(View child, android.view.ActionMode.Callback callback) { // // No starting an action mode for an action bar child! (Where would it go?) // return null; //} @Override public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if (mActionBarView == null) return; final LayoutParams lp = (LayoutParams) mActionBarView.getLayoutParams(); final int actionBarViewHeight = mActionBarView.isCollapsed() ? 0 : mActionBarView.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; if (mTabContainer != null && mTabContainer.getVisibility() != GONE) { final int mode = MeasureSpec.getMode(heightMeasureSpec); if (mode == MeasureSpec.AT_MOST) { final int maxHeight = MeasureSpec.getSize(heightMeasureSpec); setMeasuredDimension(getMeasuredWidth(), Math.min(actionBarViewHeight + mTabContainer.getMeasuredHeight(), maxHeight)); } } } @Override public void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); final boolean hasTabs = mTabContainer != null && mTabContainer.getVisibility() != GONE; if (mTabContainer != null && mTabContainer.getVisibility() != GONE) { final int containerHeight = getMeasuredHeight(); final int tabHeight = mTabContainer.getMeasuredHeight(); if ((mActionBarView.getDisplayOptions() & ActionBar.DISPLAY_SHOW_HOME) == 0) { // Not showing home, put tabs on top. final int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child == mTabContainer) continue; if (!mActionBarView.isCollapsed()) { child.offsetTopAndBottom(tabHeight); } } mTabContainer.layout(l, 0, r, tabHeight); } else { mTabContainer.layout(l, containerHeight - tabHeight, r, containerHeight); } } boolean needsInvalidate = false; if (mIsSplit) { if (mSplitBackground != null) { mSplitBackground.setBounds(0, 0, getMeasuredWidth(), getMeasuredHeight()); needsInvalidate = true; } } else { if (mBackground != null) { mBackground.setBounds(mActionBarView.getLeft(), mActionBarView.getTop(), mActionBarView.getRight(), mActionBarView.getBottom()); needsInvalidate = true; } if ((mIsStacked = hasTabs && mStackedBackground != null)) { mStackedBackground.setBounds(mTabContainer.getLeft(), mTabContainer.getTop(), mTabContainer.getRight(), mTabContainer.getBottom()); needsInvalidate = true; } } if (needsInvalidate) { invalidate(); } } }