401 lines
17 KiB
Java
401 lines
17 KiB
Java
package androidx.viewpager.widget;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.database.DataSetObserver;
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import android.graphics.drawable.Drawable;
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import android.text.TextUtils;
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import android.text.method.SingleLineTransformationMethod;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewParent;
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import android.widget.TextView;
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import androidx.annotation.ColorInt;
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import androidx.annotation.FloatRange;
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import androidx.annotation.NonNull;
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import androidx.annotation.Nullable;
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import androidx.core.widget.TextViewCompat;
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import androidx.viewpager.widget.ViewPager;
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import java.lang.ref.WeakReference;
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import java.util.Locale;
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@ViewPager.DecorView
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public class PagerTitleStrip extends ViewGroup {
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private static final int[] ATTRS = {16842804, 16842901, 16842904, 16842927};
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private static final float SIDE_ALPHA = 0.6f;
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private static final int[] TEXT_ATTRS = {16843660};
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private static final int TEXT_SPACING = 16;
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public TextView mCurrText;
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private int mGravity;
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private int mLastKnownCurrentPage;
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public float mLastKnownPositionOffset;
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public TextView mNextText;
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private int mNonPrimaryAlpha;
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private final PageListener mPageListener;
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public ViewPager mPager;
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public TextView mPrevText;
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private int mScaledTextSpacing;
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public int mTextColor;
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private boolean mUpdatingPositions;
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private boolean mUpdatingText;
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private WeakReference<PagerAdapter> mWatchingAdapter;
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public class PageListener extends DataSetObserver implements ViewPager.OnPageChangeListener, ViewPager.OnAdapterChangeListener {
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private int mScrollState;
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public PageListener() {
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}
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@Override // androidx.viewpager.widget.ViewPager.OnAdapterChangeListener
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public void onAdapterChanged(ViewPager viewPager, PagerAdapter pagerAdapter, PagerAdapter pagerAdapter2) {
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PagerTitleStrip.this.updateAdapter(pagerAdapter, pagerAdapter2);
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}
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@Override // android.database.DataSetObserver
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public void onChanged() {
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PagerTitleStrip pagerTitleStrip = PagerTitleStrip.this;
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pagerTitleStrip.updateText(pagerTitleStrip.mPager.getCurrentItem(), PagerTitleStrip.this.mPager.getAdapter());
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PagerTitleStrip pagerTitleStrip2 = PagerTitleStrip.this;
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float f = pagerTitleStrip2.mLastKnownPositionOffset;
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if (f < 0.0f) {
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f = 0.0f;
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}
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pagerTitleStrip2.updateTextPositions(pagerTitleStrip2.mPager.getCurrentItem(), f, true);
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}
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@Override // androidx.viewpager.widget.ViewPager.OnPageChangeListener
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public void onPageScrollStateChanged(int i) {
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this.mScrollState = i;
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}
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@Override // androidx.viewpager.widget.ViewPager.OnPageChangeListener
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public void onPageScrolled(int i, float f, int i2) {
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if (f > 0.5f) {
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i++;
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}
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PagerTitleStrip.this.updateTextPositions(i, f, false);
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}
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@Override // androidx.viewpager.widget.ViewPager.OnPageChangeListener
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public void onPageSelected(int i) {
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if (this.mScrollState == 0) {
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PagerTitleStrip pagerTitleStrip = PagerTitleStrip.this;
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pagerTitleStrip.updateText(pagerTitleStrip.mPager.getCurrentItem(), PagerTitleStrip.this.mPager.getAdapter());
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PagerTitleStrip pagerTitleStrip2 = PagerTitleStrip.this;
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float f = pagerTitleStrip2.mLastKnownPositionOffset;
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if (f < 0.0f) {
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f = 0.0f;
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}
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pagerTitleStrip2.updateTextPositions(pagerTitleStrip2.mPager.getCurrentItem(), f, true);
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}
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}
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}
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public static class SingleLineAllCapsTransform extends SingleLineTransformationMethod {
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private Locale mLocale;
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public SingleLineAllCapsTransform(Context context) {
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this.mLocale = context.getResources().getConfiguration().locale;
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}
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@Override // android.text.method.ReplacementTransformationMethod, android.text.method.TransformationMethod
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public CharSequence getTransformation(CharSequence charSequence, View view) {
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CharSequence transformation = super.getTransformation(charSequence, view);
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if (transformation != null) {
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return transformation.toString().toUpperCase(this.mLocale);
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}
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return null;
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}
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}
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public PagerTitleStrip(@NonNull Context context) {
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this(context, null);
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}
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public PagerTitleStrip(@NonNull Context context, @Nullable AttributeSet attributeSet) {
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super(context, attributeSet);
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this.mLastKnownCurrentPage = -1;
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this.mLastKnownPositionOffset = -1.0f;
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this.mPageListener = new PageListener();
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TextView textView = new TextView(context);
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this.mPrevText = textView;
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addView(textView);
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TextView textView2 = new TextView(context);
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this.mCurrText = textView2;
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addView(textView2);
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TextView textView3 = new TextView(context);
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this.mNextText = textView3;
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addView(textView3);
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TypedArray obtainStyledAttributes = context.obtainStyledAttributes(attributeSet, ATTRS);
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boolean z2 = false;
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int resourceId = obtainStyledAttributes.getResourceId(0, 0);
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if (resourceId != 0) {
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TextViewCompat.setTextAppearance(this.mPrevText, resourceId);
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TextViewCompat.setTextAppearance(this.mCurrText, resourceId);
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TextViewCompat.setTextAppearance(this.mNextText, resourceId);
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}
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int dimensionPixelSize = obtainStyledAttributes.getDimensionPixelSize(1, 0);
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if (dimensionPixelSize != 0) {
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setTextSize(0, (float) dimensionPixelSize);
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}
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if (obtainStyledAttributes.hasValue(2)) {
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int color = obtainStyledAttributes.getColor(2, 0);
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this.mPrevText.setTextColor(color);
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this.mCurrText.setTextColor(color);
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this.mNextText.setTextColor(color);
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}
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this.mGravity = obtainStyledAttributes.getInteger(3, 80);
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obtainStyledAttributes.recycle();
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this.mTextColor = this.mCurrText.getTextColors().getDefaultColor();
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setNonPrimaryAlpha(0.6f);
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this.mPrevText.setEllipsize(TextUtils.TruncateAt.END);
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this.mCurrText.setEllipsize(TextUtils.TruncateAt.END);
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this.mNextText.setEllipsize(TextUtils.TruncateAt.END);
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if (resourceId != 0) {
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TypedArray obtainStyledAttributes2 = context.obtainStyledAttributes(resourceId, TEXT_ATTRS);
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z2 = obtainStyledAttributes2.getBoolean(0, false);
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obtainStyledAttributes2.recycle();
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}
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if (z2) {
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setSingleLineAllCaps(this.mPrevText);
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setSingleLineAllCaps(this.mCurrText);
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setSingleLineAllCaps(this.mNextText);
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} else {
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this.mPrevText.setSingleLine();
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this.mCurrText.setSingleLine();
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this.mNextText.setSingleLine();
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}
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this.mScaledTextSpacing = (int) (context.getResources().getDisplayMetrics().density * 16.0f);
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}
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private static void setSingleLineAllCaps(TextView textView) {
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textView.setTransformationMethod(new SingleLineAllCapsTransform(textView.getContext()));
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}
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public int getMinHeight() {
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Drawable background = getBackground();
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if (background != null) {
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return background.getIntrinsicHeight();
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}
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return 0;
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}
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public int getTextSpacing() {
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return this.mScaledTextSpacing;
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}
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@Override // android.view.ViewGroup, android.view.View
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public void onAttachedToWindow() {
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super.onAttachedToWindow();
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ViewParent parent = getParent();
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if (parent instanceof ViewPager) {
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ViewPager viewPager = (ViewPager) parent;
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PagerAdapter adapter = viewPager.getAdapter();
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viewPager.setInternalPageChangeListener(this.mPageListener);
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viewPager.addOnAdapterChangeListener(this.mPageListener);
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this.mPager = viewPager;
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WeakReference<PagerAdapter> weakReference = this.mWatchingAdapter;
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updateAdapter(weakReference != null ? weakReference.get() : null, adapter);
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return;
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}
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throw new IllegalStateException("PagerTitleStrip must be a direct child of a ViewPager.");
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}
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@Override // android.view.ViewGroup, android.view.View
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public void onDetachedFromWindow() {
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super.onDetachedFromWindow();
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ViewPager viewPager = this.mPager;
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if (viewPager != null) {
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updateAdapter(viewPager.getAdapter(), null);
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this.mPager.setInternalPageChangeListener(null);
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this.mPager.removeOnAdapterChangeListener(this.mPageListener);
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this.mPager = null;
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}
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}
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@Override // android.view.ViewGroup, android.view.View
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public void onLayout(boolean z2, int i, int i2, int i3, int i4) {
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if (this.mPager != null) {
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float f = this.mLastKnownPositionOffset;
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if (f < 0.0f) {
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f = 0.0f;
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}
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updateTextPositions(this.mLastKnownCurrentPage, f, true);
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}
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}
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@Override // android.view.View
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public void onMeasure(int i, int i2) {
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int i3;
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if (View.MeasureSpec.getMode(i) == 1073741824) {
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int paddingBottom = getPaddingBottom() + getPaddingTop();
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int childMeasureSpec = ViewGroup.getChildMeasureSpec(i2, paddingBottom, -2);
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int size = View.MeasureSpec.getSize(i);
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int childMeasureSpec2 = ViewGroup.getChildMeasureSpec(i, (int) (((float) size) * 0.2f), -2);
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this.mPrevText.measure(childMeasureSpec2, childMeasureSpec);
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this.mCurrText.measure(childMeasureSpec2, childMeasureSpec);
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this.mNextText.measure(childMeasureSpec2, childMeasureSpec);
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if (View.MeasureSpec.getMode(i2) == 1073741824) {
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i3 = View.MeasureSpec.getSize(i2);
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} else {
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i3 = Math.max(getMinHeight(), this.mCurrText.getMeasuredHeight() + paddingBottom);
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}
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setMeasuredDimension(size, View.resolveSizeAndState(i3, i2, this.mCurrText.getMeasuredState() << 16));
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return;
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}
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throw new IllegalStateException("Must measure with an exact width");
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}
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@Override // android.view.ViewParent, android.view.View
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public void requestLayout() {
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if (!this.mUpdatingText) {
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super.requestLayout();
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}
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}
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public void setGravity(int i) {
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this.mGravity = i;
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requestLayout();
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}
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public void setNonPrimaryAlpha(@FloatRange(from = 0.0d, to = 1.0d) float f) {
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int i = ((int) (f * 255.0f)) & 255;
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this.mNonPrimaryAlpha = i;
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int i2 = (i << 24) | (this.mTextColor & 16777215);
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this.mPrevText.setTextColor(i2);
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this.mNextText.setTextColor(i2);
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}
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public void setTextColor(@ColorInt int i) {
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this.mTextColor = i;
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this.mCurrText.setTextColor(i);
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int i2 = (this.mNonPrimaryAlpha << 24) | (this.mTextColor & 16777215);
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this.mPrevText.setTextColor(i2);
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this.mNextText.setTextColor(i2);
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}
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public void setTextSize(int i, float f) {
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this.mPrevText.setTextSize(i, f);
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this.mCurrText.setTextSize(i, f);
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this.mNextText.setTextSize(i, f);
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}
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public void setTextSpacing(int i) {
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this.mScaledTextSpacing = i;
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requestLayout();
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}
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public void updateAdapter(PagerAdapter pagerAdapter, PagerAdapter pagerAdapter2) {
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if (pagerAdapter != null) {
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pagerAdapter.unregisterDataSetObserver(this.mPageListener);
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this.mWatchingAdapter = null;
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}
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if (pagerAdapter2 != null) {
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pagerAdapter2.registerDataSetObserver(this.mPageListener);
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this.mWatchingAdapter = new WeakReference<>(pagerAdapter2);
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}
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ViewPager viewPager = this.mPager;
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if (viewPager != null) {
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this.mLastKnownCurrentPage = -1;
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this.mLastKnownPositionOffset = -1.0f;
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updateText(viewPager.getCurrentItem(), pagerAdapter2);
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requestLayout();
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}
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}
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public void updateText(int i, PagerAdapter pagerAdapter) {
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int count = pagerAdapter != null ? pagerAdapter.getCount() : 0;
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this.mUpdatingText = true;
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CharSequence charSequence = null;
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this.mPrevText.setText((i < 1 || pagerAdapter == null) ? null : pagerAdapter.getPageTitle(i - 1));
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this.mCurrText.setText((pagerAdapter == null || i >= count) ? null : pagerAdapter.getPageTitle(i));
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int i2 = i + 1;
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if (i2 < count && pagerAdapter != null) {
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charSequence = pagerAdapter.getPageTitle(i2);
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}
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this.mNextText.setText(charSequence);
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int makeMeasureSpec = View.MeasureSpec.makeMeasureSpec(Math.max(0, (int) (((float) ((getWidth() - getPaddingLeft()) - getPaddingRight())) * 0.8f)), Integer.MIN_VALUE);
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int makeMeasureSpec2 = View.MeasureSpec.makeMeasureSpec(Math.max(0, (getHeight() - getPaddingTop()) - getPaddingBottom()), Integer.MIN_VALUE);
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this.mPrevText.measure(makeMeasureSpec, makeMeasureSpec2);
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this.mCurrText.measure(makeMeasureSpec, makeMeasureSpec2);
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this.mNextText.measure(makeMeasureSpec, makeMeasureSpec2);
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this.mLastKnownCurrentPage = i;
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if (!this.mUpdatingPositions) {
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updateTextPositions(i, this.mLastKnownPositionOffset, false);
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}
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this.mUpdatingText = false;
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}
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public void updateTextPositions(int i, float f, boolean z2) {
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int i2;
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int i3;
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int i4;
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int i5;
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if (i != this.mLastKnownCurrentPage) {
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updateText(i, this.mPager.getAdapter());
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} else if (!z2 && f == this.mLastKnownPositionOffset) {
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return;
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}
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this.mUpdatingPositions = true;
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int measuredWidth = this.mPrevText.getMeasuredWidth();
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int measuredWidth2 = this.mCurrText.getMeasuredWidth();
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int measuredWidth3 = this.mNextText.getMeasuredWidth();
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int i6 = measuredWidth2 / 2;
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int width = getWidth();
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int height = getHeight();
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int paddingLeft = getPaddingLeft();
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int paddingRight = getPaddingRight();
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int paddingTop = getPaddingTop();
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int paddingBottom = getPaddingBottom();
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int i7 = paddingRight + i6;
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int i8 = (width - (paddingLeft + i6)) - i7;
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float f2 = 0.5f + f;
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if (f2 > 1.0f) {
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f2 -= 1.0f;
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}
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int i9 = ((width - i7) - ((int) (((float) i8) * f2))) - i6;
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int i10 = measuredWidth2 + i9;
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int baseline = this.mPrevText.getBaseline();
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int baseline2 = this.mCurrText.getBaseline();
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int baseline3 = this.mNextText.getBaseline();
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int max = Math.max(Math.max(baseline, baseline2), baseline3);
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int i11 = max - baseline;
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int i12 = max - baseline2;
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int i13 = max - baseline3;
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int max2 = Math.max(Math.max(this.mPrevText.getMeasuredHeight() + i11, this.mCurrText.getMeasuredHeight() + i12), this.mNextText.getMeasuredHeight() + i13);
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int i14 = this.mGravity & 112;
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if (i14 == 16) {
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i5 = (((height - paddingTop) - paddingBottom) - max2) / 2;
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} else if (i14 != 80) {
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i4 = i11 + paddingTop;
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i2 = i12 + paddingTop;
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i3 = paddingTop + i13;
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TextView textView = this.mCurrText;
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textView.layout(i9, i2, i10, textView.getMeasuredHeight() + i2);
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int min = Math.min(paddingLeft, (i9 - this.mScaledTextSpacing) - measuredWidth);
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TextView textView2 = this.mPrevText;
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textView2.layout(min, i4, measuredWidth + min, textView2.getMeasuredHeight() + i4);
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int max3 = Math.max((width - paddingRight) - measuredWidth3, i10 + this.mScaledTextSpacing);
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TextView textView3 = this.mNextText;
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textView3.layout(max3, i3, max3 + measuredWidth3, textView3.getMeasuredHeight() + i3);
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this.mLastKnownPositionOffset = f;
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this.mUpdatingPositions = false;
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} else {
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i5 = (height - paddingBottom) - max2;
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}
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i4 = i11 + i5;
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i2 = i12 + i5;
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i3 = i5 + i13;
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TextView textView = this.mCurrText;
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textView.layout(i9, i2, i10, textView.getMeasuredHeight() + i2);
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int min = Math.min(paddingLeft, (i9 - this.mScaledTextSpacing) - measuredWidth);
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TextView textView2 = this.mPrevText;
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textView2.layout(min, i4, measuredWidth + min, textView2.getMeasuredHeight() + i4);
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int max3 = Math.max((width - paddingRight) - measuredWidth3, i10 + this.mScaledTextSpacing);
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TextView textView3 = this.mNextText;
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textView3.layout(max3, i3, max3 + measuredWidth3, textView3.getMeasuredHeight() + i3);
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this.mLastKnownPositionOffset = f;
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this.mUpdatingPositions = false;
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}
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}
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