仿简书APP源码

/* * Copyright (C) 2011 Jake Wharton * Copyright (C) 2011 Patrik Akerfeldt * Copyright (C) 2011 Francisco Figueiredo Jr. * * 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.zanlabs.widget.infiniteviewpager.indicator; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Rect; import android.graphics.Typeface; import android.graphics.drawable.Drawable; import android.os.Parcel; import android.os.Parcelable; import android.support.v4.view.MotionEventCompat; import android.support.v4.view.ViewConfigurationCompat; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import com.zanlabs.widget.infiniteviewpager.InfiniteViewPager; import com.zanlabs.widget.infiniteviewpager.R; import java.util.ArrayList; /** * A TitlePageIndicator is a PageIndicator which displays the title of left view * (if exist), the title of the current select view (centered) and the title of * the right view (if exist). When the user scrolls the ViewPager then titles are * also scrolled. */ public class TitlePageIndicator extends View implements PageIndicator { /** * Percentage indicating what percentage of the screen width away from * center should the underline be fully faded. A value of 0.25 means that * halfway between the center of the screen and an edge. */ private static final float SELECTION_FADE_PERCENTAGE = 0.25f; /** * Percentage indicating what percentage of the screen width away from * center should the selected text bold turn off. A value of 0.05 means * that 10% between the center and an edge. */ private static final float BOLD_FADE_PERCENTAGE = 0.05f; /** * Title text used when no title is provided by the adapter. */ private static final String EMPTY_TITLE = ""; /** * Interface for a callback when the center item has been clicked. */ public interface OnCenterItemClickListener { /** * Callback when the center item has been clicked. * * @param position Position of the current center item. */ void onCenterItemClick(int position); } public enum IndicatorStyle { None(0), Triangle(1), Underline(2); public final int value; private IndicatorStyle(int value) { this.value = value; } public static IndicatorStyle fromValue(int value) { for (IndicatorStyle style : IndicatorStyle.values()) { if (style.value == value) { return style; } } return null; } } public enum LinePosition { Bottom(0), Top(1); public final int value; private LinePosition(int value) { this.value = value; } public static LinePosition fromValue(int value) { for (LinePosition position : LinePosition.values()) { if (position.value == value) { return position; } } return null; } } private ViewPager mViewPager; private ViewPager.OnPageChangeListener mListener; private int mCurrentPage = -1; private float mPageOffset; private int mScrollState; private final Paint mPaintText = new Paint(); private boolean mBoldText; private int mColorText; private int mColorSelected; private Path mPath = new Path(); private final Rect mBounds = new Rect(); private final Paint mPaintFooterLine = new Paint(); private IndicatorStyle mFooterIndicatorStyle; private LinePosition mLinePosition; private final Paint mPaintFooterIndicator = new Paint(); private float mFooterIndicatorHeight; private float mFooterIndicatorUnderlinePadding; private float mFooterPadding; private float mTitlePadding; private float mTopPadding; /** Left and right side padding for not active view titles. */ private float mClipPadding; private float mFooterLineHeight; private static final int INVALID_POINTER = -1; private int mTouchSlop; private float mLastMotionX = -1; private int mActivePointerId = INVALID_POINTER; private boolean mIsDragging; private OnCenterItemClickListener mCenterItemClickListener; public TitlePageIndicator(Context context) { this(context, null); } public TitlePageIndicator(Context context, AttributeSet attrs) { this(context, attrs, R.attr.vpiTitlePageIndicatorStyle); } public TitlePageIndicator(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); if (isInEditMode()) return; //Load defaults from resources final Resources res = getResources(); final int defaultFooterColor = res.getColor(R.color.default_title_indicator_footer_color); final float defaultFooterLineHeight = res.getDimension(R.dimen.default_title_indicator_footer_line_height); final int defaultFooterIndicatorStyle = res.getInteger(R.integer.default_title_indicator_footer_indicator_style); final float defaultFooterIndicatorHeight = res.getDimension(R.dimen.default_title_indicator_footer_indicator_height); final float defaultFooterIndicatorUnderlinePadding = res.getDimension(R.dimen.default_title_indicator_footer_indicator_underline_padding); final float defaultFooterPadding = res.getDimension(R.dimen.default_title_indicator_footer_padding); final int defaultLinePosition = res.getInteger(R.integer.default_title_indicator_line_position); final int defaultSelectedColor = res.getColor(R.color.default_title_indicator_selected_color); final boolean defaultSelectedBold = res.getBoolean(R.bool.default_title_indicator_selected_bold); final int defaultTextColor = res.getColor(R.color.default_title_indicator_text_color); final float defaultTextSize = res.getDimension(R.dimen.default_title_indicator_text_size); final float defaultTitlePadding = res.getDimension(R.dimen.default_title_indicator_title_padding); final float defaultClipPadding = res.getDimension(R.dimen.default_title_indicator_clip_padding); final float defaultTopPadding = res.getDimension(R.dimen.default_title_indicator_top_padding); //Retrieve styles attributes TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TitlePageIndicator, defStyle, 0); //Retrieve the colors to be used for this view and apply them. mFooterLineHeight = a.getDimension(R.styleable.TitlePageIndicator_footerLineHeight, defaultFooterLineHeight); mFooterIndicatorStyle = IndicatorStyle.fromValue(a.getInteger(R.styleable.TitlePageIndicator_footerIndicatorStyle, defaultFooterIndicatorStyle)); mFooterIndicatorHeight = a.getDimension(R.styleable.TitlePageIndicator_footerIndicatorHeight, defaultFooterIndicatorHeight); mFooterIndicatorUnderlinePadding = a.getDimension(R.styleable.TitlePageIndicator_footerIndicatorUnderlinePadding, defaultFooterIndicatorUnderlinePadding); mFooterPadding = a.getDimension(R.styleable.TitlePageIndicator_footerPadding, defaultFooterPadding); mLinePosition