mirror of
https://github.com/MatomoCamp/matomocamp-companion-android.git
synced 2024-09-20 17:23:46 +02:00
403 lines
No EOL
13 KiB
Java
403 lines
No EOL
13 KiB
Java
/*
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* Copyright (C) 2012 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 com.viewpagerindicator;
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import be.digitalia.fosdem.R;
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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.drawable.Drawable;
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import android.os.Parcel;
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import android.os.Parcelable;
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import android.support.v4.view.MotionEventCompat;
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import android.support.v4.view.ViewConfigurationCompat;
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import android.support.v4.view.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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/**
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* Draws a line for each page. The current page line is colored differently
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* than the unselected page lines.
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*/
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public class UnderlinePageIndicator extends View implements PageIndicator {
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private static final int INVALID_POINTER = -1;
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private static final int FADE_FRAME_MS = 30;
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private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
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private boolean mFades;
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private int mFadeDelay;
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private int mFadeLength;
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private int mFadeBy;
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private ViewPager mViewPager;
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private ViewPager.OnPageChangeListener mListener;
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private int mScrollState;
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private int mCurrentPage;
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private float mPositionOffset;
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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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private final Runnable mFadeRunnable = new Runnable() {
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@Override public void run() {
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if (!mFades) return;
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final int alpha = Math.max(mPaint.getAlpha() - mFadeBy, 0);
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mPaint.setAlpha(alpha);
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invalidate();
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if (alpha > 0) {
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postDelayed(this, FADE_FRAME_MS);
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}
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}
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};
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public UnderlinePageIndicator(Context context) {
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this(context, null);
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}
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public UnderlinePageIndicator(Context context, AttributeSet attrs) {
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this(context, attrs, R.attr.vpiUnderlinePageIndicatorStyle);
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}
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public UnderlinePageIndicator(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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final Resources res = getResources();
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//Load defaults from resources
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final boolean defaultFades = res.getBoolean(R.bool.default_underline_indicator_fades);
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final int defaultFadeDelay = res.getInteger(R.integer.default_underline_indicator_fade_delay);
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final int defaultFadeLength = res.getInteger(R.integer.default_underline_indicator_fade_length);
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final int defaultSelectedColor = res.getColor(R.color.default_underline_indicator_selected_color);
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//Retrieve styles attributes
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.UnderlinePageIndicator, defStyle, 0);
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setFades(a.getBoolean(R.styleable.UnderlinePageIndicator_fades, defaultFades));
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setSelectedColor(a.getColor(R.styleable.UnderlinePageIndicator_selectedColor, defaultSelectedColor));
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setFadeDelay(a.getInteger(R.styleable.UnderlinePageIndicator_fadeDelay, defaultFadeDelay));
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setFadeLength(a.getInteger(R.styleable.UnderlinePageIndicator_fadeLength, defaultFadeLength));
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Drawable background = a.getDrawable(R.styleable.UnderlinePageIndicator_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 boolean getFades() {
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return mFades;
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}
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public void setFades(boolean fades) {
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if (fades != mFades) {
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mFades = fades;
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if (fades) {
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post(mFadeRunnable);
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} else {
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removeCallbacks(mFadeRunnable);
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mPaint.setAlpha(0xFF);
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invalidate();
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}
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}
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}
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public int getFadeDelay() {
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return mFadeDelay;
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}
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public void setFadeDelay(int fadeDelay) {
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mFadeDelay = fadeDelay;
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}
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public int getFadeLength() {
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return mFadeLength;
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}
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public void setFadeLength(int fadeLength) {
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mFadeLength = fadeLength;
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mFadeBy = 0xFF / (mFadeLength / FADE_FRAME_MS);
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}
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public int getSelectedColor() {
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return mPaint.getColor();
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}
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public void setSelectedColor(int selectedColor) {
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mPaint.setColor(selectedColor);
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invalidate();
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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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final int paddingLeft = getPaddingLeft();
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final float pageWidth = (getWidth() - paddingLeft - getPaddingRight()) / (1f * count);
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final float left = paddingLeft + pageWidth * (mCurrentPage + mPositionOffset);
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final float right = left + pageWidth;
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final float top = getPaddingTop();
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final float bottom = getHeight() - getPaddingBottom();
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canvas.drawRect(left, top, right, bottom, mPaint);
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}
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public boolean onTouchEvent(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 viewPager) {
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if (mViewPager == viewPager) {
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return;
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}
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if (mViewPager != null) {
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//Clear us from the old pager.
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mViewPager.setOnPageChangeListener(null);
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}
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if (viewPager.getAdapter() == null) {
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throw new IllegalStateException("ViewPager does not have adapter instance.");
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}
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mViewPager = viewPager;
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mViewPager.setOnPageChangeListener(this);
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invalidate();
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post(new Runnable() {
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@Override public void run() {
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if (mFades) {
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post(mFadeRunnable);
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}
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}
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});
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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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mPositionOffset = positionOffset;
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if (mFades) {
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if (positionOffsetPixels > 0) {
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removeCallbacks(mFadeRunnable);
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mPaint.setAlpha(0xFF);
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} else if (mScrollState != ViewPager.SCROLL_STATE_DRAGGING) {
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postDelayed(mFadeRunnable, mFadeDelay);
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}
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}
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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 (mScrollState == ViewPager.SCROLL_STATE_IDLE) {
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mCurrentPage = position;
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mPositionOffset = 0;
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invalidate();
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mFadeRunnable.run();
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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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@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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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 {
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int currentPage;
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public SavedState(Parcelable superState) {
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super(superState);
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}
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private SavedState(Parcel in) {
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super(in);
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currentPage = in.readInt();
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}
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@Override
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public void writeToParcel(Parcel dest, int flags) {
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super.writeToParcel(dest, flags);
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dest.writeInt(currentPage);
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}
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@SuppressWarnings("UnusedDeclaration")
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public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
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@Override
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public SavedState createFromParcel(Parcel in) {
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return new SavedState(in);
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}
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@Override
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public SavedState[] newArray(int size) {
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return new SavedState[size];
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}
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};
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}
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} |