572 lines
19 KiB
Java
572 lines
19 KiB
Java
/*
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* Copyright (C) 2011 Patrik Akerfeldt
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* Copyright (C) 2011 Jake Wharton
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.xbmc.kore.ui.views;
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import android.content.Context;
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import android.content.res.Resources;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.Paint.Style;
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import android.graphics.drawable.Drawable;
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import android.os.Parcel;
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import android.os.Parcelable;
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import androidx.core.view.MotionEventCompat;
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import androidx.core.view.ViewConfigurationCompat;
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import androidx.viewpager.widget.ViewPager;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.ViewConfiguration;
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import org.xbmc.kore.R;
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import static android.graphics.Paint.ANTI_ALIAS_FLAG;
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import static android.widget.LinearLayout.HORIZONTAL;
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import static android.widget.LinearLayout.VERTICAL;
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/**
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* Draws circles (one for each view). The current view position is filled and
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* others are only stroked.
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*/
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public class CirclePageIndicator extends View implements PageIndicator {
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private static final int INVALID_POINTER = -1;
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private float mGapWidth;
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private float mRadius;
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private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);
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private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);
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private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);
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private ViewPager mViewPager;
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private ViewPager.OnPageChangeListener mListener;
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private int mCurrentPage;
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private int mSnapPage;
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private float mPageOffset;
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private int mScrollState;
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private int mOrientation;
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private boolean mCentered;
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private boolean mSnap;
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private int mTouchSlop;
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private float mLastMotionX = -1;
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private int mActivePointerId = INVALID_POINTER;
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private boolean mIsDragging;
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public CirclePageIndicator(Context context) {
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this(context, null);
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}
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public CirclePageIndicator(Context context, AttributeSet attrs) {
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this(context, attrs, R.attr.vpiCirclePageIndicatorStyle);
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}
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public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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if (isInEditMode()) return;
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//Load defaults from resources
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final Resources res = getResources();
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final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color);
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final int defaultFillColor = res.getColor(R.color.default_circle_indicator_fill_color);
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final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation);
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final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color);
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final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width);
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final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius);
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final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered);
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final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap);
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final float defaultGapWidth = res.getDimension(R.dimen.default_circle_indicator_gap_width);
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//Retrieve styles attributes
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0);
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mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered);
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mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation);
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mPaintPageFill.setStyle(Style.FILL);
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mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor));
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mPaintStroke.setStyle(Style.STROKE);
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mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor));
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mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth));
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mPaintFill.setStyle(Style.FILL);
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mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor));
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mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius);
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mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap);
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mGapWidth = a.getDimension(R.styleable.CirclePageIndicator_circleGapWidth, defaultGapWidth);
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Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background);
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if (background != null) {
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setBackgroundDrawable(background);
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}
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a.recycle();
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final ViewConfiguration configuration = ViewConfiguration.get(context);
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mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
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}
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public void setCentered(boolean centered) {
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mCentered = centered;
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invalidate();
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}
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public boolean isCentered() {
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return mCentered;
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}
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public void setPageColor(int pageColor) {
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mPaintPageFill.setColor(pageColor);
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invalidate();
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}
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public int getPageColor() {
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return mPaintPageFill.getColor();
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}
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public void setFillColor(int fillColor) {
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mPaintFill.setColor(fillColor);
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invalidate();
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}
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public int getFillColor() {
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return mPaintFill.getColor();
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}
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public void setOrientation(int orientation) {
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switch (orientation) {
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case HORIZONTAL:
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case VERTICAL:
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mOrientation = orientation;
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requestLayout();
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break;
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default:
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throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL.");
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}
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}
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public int getOrientation() {
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return mOrientation;
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}
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public void setStrokeColor(int strokeColor) {
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mPaintStroke.setColor(strokeColor);
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invalidate();
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}
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public int getStrokeColor() {
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return mPaintStroke.getColor();
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}
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public void setStrokeWidth(float strokeWidth) {
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mPaintStroke.setStrokeWidth(strokeWidth);
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invalidate();
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}
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public float getStrokeWidth() {
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return mPaintStroke.getStrokeWidth();
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}
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public void setRadius(float radius) {
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mRadius = radius;
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invalidate();
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}
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public float getRadius() {
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return mRadius;
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}
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public void setGapWidth(float gapWidth) {
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mGapWidth = gapWidth;
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invalidate();
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}
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public float getGapWidth() {
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return mGapWidth;
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}
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public void setSnap(boolean snap) {
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mSnap = snap;
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invalidate();
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}
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public boolean isSnap() {
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return mSnap;
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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if (mViewPager == null) {
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return;
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}
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final int count = mViewPager.getAdapter().getCount();
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if (count == 0) {
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return;
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}
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if (mCurrentPage >= count) {
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setCurrentItem(count - 1);
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return;
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}
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int longSize;
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int longPaddingBefore;
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int longPaddingAfter;
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int shortPaddingBefore;
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if (mOrientation == HORIZONTAL) {
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longSize = getWidth();
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longPaddingBefore = getPaddingLeft();
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longPaddingAfter = getPaddingRight();
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shortPaddingBefore = getPaddingTop();
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} else {
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longSize = getHeight();
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longPaddingBefore = getPaddingTop();
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longPaddingAfter = getPaddingBottom();
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shortPaddingBefore = getPaddingLeft();
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}
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final float centerToCenter = mRadius * 2 + mGapWidth;
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final float shortOffset = shortPaddingBefore + mRadius;
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float longOffset = longPaddingBefore + mRadius;
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if (mCentered) {
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longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - ((count * centerToCenter) / 2.0f);
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}
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float dX;
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float dY;
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float pageFillRadius = mRadius;
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if (mPaintStroke.getStrokeWidth() > 0) {
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pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f;
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}
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//Draw stroked circles
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for (int iLoop = 0; iLoop < count; iLoop++) {
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float drawLong = longOffset + (iLoop * centerToCenter);
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if (mOrientation == HORIZONTAL) {
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dX = drawLong;
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dY = shortOffset;
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} else {
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dX = shortOffset;
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dY = drawLong;
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}
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// Only paint fill if not completely transparent
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if (mPaintPageFill.getAlpha() > 0) {
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canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill);
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}
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// Only paint stroke if a stroke width was non-zero
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if (pageFillRadius != mRadius) {
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canvas.drawCircle(dX, dY, mRadius, mPaintStroke);
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}
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}
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//Draw the filled circle according to the current scroll
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float cx = (mSnap ? mSnapPage : mCurrentPage) * centerToCenter;
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if (!mSnap) {
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cx += mPageOffset * centerToCenter;
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}
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if (mOrientation == HORIZONTAL) {
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dX = longOffset + cx;
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dY = shortOffset;
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} else {
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dX = shortOffset;
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dY = longOffset + cx;
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}
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canvas.drawCircle(dX, dY, mRadius, mPaintFill);
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}
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public boolean onTouchEvent(android.view.MotionEvent ev) {
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if (super.onTouchEvent(ev)) {
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return true;
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}
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if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0)) {
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return false;
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}
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final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
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switch (action) {
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case MotionEvent.ACTION_DOWN:
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mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
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mLastMotionX = ev.getX();
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break;
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case MotionEvent.ACTION_MOVE: {
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final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
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final float x = MotionEventCompat.getX(ev, activePointerIndex);
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final float deltaX = x - mLastMotionX;
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if (!mIsDragging) {
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if (Math.abs(deltaX) > mTouchSlop) {
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mIsDragging = true;
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}
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}
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if (mIsDragging) {
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mLastMotionX = x;
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if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) {
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mViewPager.fakeDragBy(deltaX);
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}
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}
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break;
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}
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case MotionEvent.ACTION_CANCEL:
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case MotionEvent.ACTION_UP:
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if (!mIsDragging) {
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final int count = mViewPager.getAdapter().getCount();
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final int width = getWidth();
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final float halfWidth = width / 2f;
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final float sixthWidth = width / 6f;
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if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) {
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if (action != MotionEvent.ACTION_CANCEL) {
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mViewPager.setCurrentItem(mCurrentPage - 1);
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}
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return true;
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} else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) {
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if (action != MotionEvent.ACTION_CANCEL) {
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mViewPager.setCurrentItem(mCurrentPage + 1);
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}
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return true;
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}
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}
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mIsDragging = false;
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mActivePointerId = INVALID_POINTER;
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if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag();
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break;
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case MotionEventCompat.ACTION_POINTER_DOWN: {
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final int index = MotionEventCompat.getActionIndex(ev);
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mLastMotionX = MotionEventCompat.getX(ev, index);
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mActivePointerId = MotionEventCompat.getPointerId(ev, index);
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break;
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}
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case MotionEventCompat.ACTION_POINTER_UP:
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final int pointerIndex = MotionEventCompat.getActionIndex(ev);
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final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
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if (pointerId == mActivePointerId) {
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final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
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mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
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}
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mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
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break;
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}
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return true;
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}
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@Override
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public void setViewPager(ViewPager view) {
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if (mViewPager == view) {
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return;
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}
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if (mViewPager != null) {
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mViewPager.setOnPageChangeListener(null);
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}
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if (view.getAdapter() == null) {
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throw new IllegalStateException("ViewPager does not have adapter instance.");
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}
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mViewPager = view;
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mViewPager.setOnPageChangeListener(this);
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invalidate();
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}
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@Override
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public void setViewPager(ViewPager view, int initialPosition) {
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setViewPager(view);
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setCurrentItem(initialPosition);
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}
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@Override
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public void setCurrentItem(int item) {
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if (mViewPager == null) {
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throw new IllegalStateException("ViewPager has not been bound.");
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}
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mViewPager.setCurrentItem(item);
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mCurrentPage = item;
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invalidate();
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}
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@Override
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public void notifyDataSetChanged() {
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invalidate();
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}
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@Override
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public void onPageScrollStateChanged(int state) {
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mScrollState = state;
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if (mListener != null) {
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mListener.onPageScrollStateChanged(state);
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}
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}
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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mCurrentPage = position;
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mPageOffset = positionOffset;
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invalidate();
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if (mListener != null) {
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mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
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}
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}
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@Override
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public void onPageSelected(int position) {
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if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) {
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mCurrentPage = position;
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mSnapPage = position;
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invalidate();
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}
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if (mListener != null) {
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mListener.onPageSelected(position);
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}
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}
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@Override
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public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
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mListener = listener;
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}
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/*
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* (non-Javadoc)
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*
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* @see android.view.View#onMeasure(int, int)
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*/
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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if (mOrientation == HORIZONTAL) {
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setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec));
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} else {
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setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(heightMeasureSpec));
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}
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}
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/**
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* Determines the width of this view
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*
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* @param measureSpec
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* A measureSpec packed into an int
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* @return The width of the view, honoring constraints from measureSpec
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*/
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private int measureLong(int measureSpec) {
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int result;
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int specMode = MeasureSpec.getMode(measureSpec);
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int specSize = MeasureSpec.getSize(measureSpec);
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if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) {
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//We were told how big to be
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result = specSize;
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} else {
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//Calculate the width according the views count
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final int count = mViewPager.getAdapter().getCount();
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result = (int)(getPaddingLeft() + getPaddingRight()
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+ (count * 2 * mRadius) + (count - 1) * mRadius + 1);
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//Respect AT_MOST value if that was what is called for by measureSpec
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if (specMode == MeasureSpec.AT_MOST) {
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result = Math.min(result, specSize);
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}
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}
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return result;
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}
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/**
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* Determines the height of this view
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*
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* @param measureSpec
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* A measureSpec packed into an int
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* @return The height of the view, honoring constraints from measureSpec
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*/
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private int measureShort(int measureSpec) {
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int result;
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int specMode = MeasureSpec.getMode(measureSpec);
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int specSize = MeasureSpec.getSize(measureSpec);
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if (specMode == MeasureSpec.EXACTLY) {
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//We were told how big to be
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result = specSize;
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} else {
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//Measure the height
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result = (int)(2 * mRadius + getPaddingTop() + getPaddingBottom() + 1);
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//Respect AT_MOST value if that was what is called for by measureSpec
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if (specMode == MeasureSpec.AT_MOST) {
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result = Math.min(result, specSize);
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}
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}
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return result;
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}
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@Override
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public void onRestoreInstanceState(Parcelable state) {
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SavedState savedState = (SavedState)state;
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super.onRestoreInstanceState(savedState.getSuperState());
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mCurrentPage = savedState.currentPage;
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mSnapPage = savedState.currentPage;
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requestLayout();
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}
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@Override
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public Parcelable onSaveInstanceState() {
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Parcelable superState = super.onSaveInstanceState();
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SavedState savedState = new SavedState(superState);
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savedState.currentPage = mCurrentPage;
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return savedState;
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}
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|
|
|
static class SavedState extends BaseSavedState {
|
|
int currentPage;
|
|
|
|
public SavedState(Parcelable superState) {
|
|
super(superState);
|
|
}
|
|
|
|
private SavedState(Parcel in) {
|
|
super(in);
|
|
currentPage = in.readInt();
|
|
}
|
|
|
|
@Override
|
|
public void writeToParcel(Parcel dest, int flags) {
|
|
super.writeToParcel(dest, flags);
|
|
dest.writeInt(currentPage);
|
|
}
|
|
|
|
@SuppressWarnings("UnusedDeclaration")
|
|
public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
|
|
@Override
|
|
public SavedState createFromParcel(Parcel in) {
|
|
return new SavedState(in);
|
|
}
|
|
|
|
@Override
|
|
public SavedState[] newArray(int size) {
|
|
return new SavedState[size];
|
|
}
|
|
};
|
|
}
|
|
}
|