435 lines
16 KiB
Java
435 lines
16 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 org.mariotaku.twidere.view;
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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.annotation.NonNull;
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import android.support.v4.content.ContextCompat;
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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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import org.mariotaku.twidere.R;
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import org.mariotaku.twidere.util.support.ViewSupport;
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import org.mariotaku.twidere.view.iface.PagerIndicator;
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/**
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* Draws a line for each page. The current page line is colored differently than
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* the unselected page lines.
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*/
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public class LinePageIndicator extends View implements PagerIndicator {
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private static final int INVALID_POINTER = -1;
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private int mActivePointerId = INVALID_POINTER;
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private final Paint mPaintUnselected = new Paint(Paint.ANTI_ALIAS_FLAG);
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private final Paint mPaintSelected = new Paint(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 boolean mCentered;
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private float mLineWidth;
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private float mGapWidth;
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private int mTouchSlop;
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private float mLastMotionX = -1;
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private boolean mIsDragging;
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public LinePageIndicator(final Context context) {
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this(context, null);
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}
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public LinePageIndicator(final Context context, final AttributeSet attrs) {
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super(context, attrs, 0);
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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 int defaultSelectedColor = ContextCompat.getColor(context, R.color.default_line_indicator_selected_color);
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final int defaultUnselectedColor = ContextCompat.getColor(context, R.color.default_line_indicator_unselected_color);
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final float defaultLineWidth = res.getDimension(R.dimen.default_line_indicator_line_width);
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final float defaultGapWidth = res.getDimension(R.dimen.default_line_indicator_gap_width);
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final float defaultStrokeWidth = res.getDimension(R.dimen.default_line_indicator_stroke_width);
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final boolean defaultCentered = res.getBoolean(R.bool.default_line_indicator_centered);
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// Retrieve styles attributes
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final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LinePageIndicator, 0, 0);
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mCentered = a.getBoolean(R.styleable.LinePageIndicator_centered, defaultCentered);
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mLineWidth = a.getDimension(R.styleable.LinePageIndicator_lineWidth, defaultLineWidth);
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mGapWidth = a.getDimension(R.styleable.LinePageIndicator_gapWidth, defaultGapWidth);
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setStrokeWidth(a.getDimension(R.styleable.LinePageIndicator_strokeWidth, defaultStrokeWidth));
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mPaintUnselected.setColor(a.getColor(R.styleable.LinePageIndicator_unselectedColor, defaultUnselectedColor));
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mPaintSelected.setColor(a.getColor(R.styleable.LinePageIndicator_selectedColor, defaultSelectedColor));
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final Drawable background = a.getDrawable(R.styleable.LinePageIndicator_android_background);
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if (background != null) {
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ViewSupport.setBackground(this, 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 float getGapWidth() {
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return mGapWidth;
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}
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public void setGapWidth(final float gapWidth) {
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mGapWidth = gapWidth;
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invalidate();
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}
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public float getLineWidth() {
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return mLineWidth;
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}
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public void setLineWidth(final float lineWidth) {
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mLineWidth = lineWidth;
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invalidate();
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}
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public int getSelectedColor() {
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return mPaintSelected.getColor();
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}
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public void setSelectedColor(final int selectedColor) {
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mPaintSelected.setColor(selectedColor);
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invalidate();
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}
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public float getStrokeWidth() {
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return mPaintSelected.getStrokeWidth();
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}
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@SuppressWarnings("SuspiciousNameCombination")
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public void setStrokeWidth(final float lineHeight) {
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mPaintSelected.setStrokeWidth(lineHeight);
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mPaintUnselected.setStrokeWidth(lineHeight);
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invalidate();
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}
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public int getUnselectedColor() {
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return mPaintUnselected.getColor();
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}
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public void setUnselectedColor(final int unselectedColor) {
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mPaintUnselected.setColor(unselectedColor);
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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 setCentered(final boolean centered) {
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mCentered = centered;
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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 setCurrentItem(final int item) {
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if (mViewPager == null) throw new IllegalStateException("ViewPager has not been bound.");
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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 setOnPageChangeListener(final ViewPager.OnPageChangeListener listener) {
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mListener = listener;
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}
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@Override
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public void setViewPager(final ViewPager viewPager) {
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if (mViewPager == viewPager) return;
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if (mViewPager != null) {
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// Clear us from the old pager.
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mViewPager.removeOnPageChangeListener(this);
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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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mViewPager = viewPager;
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mViewPager.addOnPageChangeListener(this);
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invalidate();
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}
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@Override
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public void setViewPager(final ViewPager view, final 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 onPageScrolled(final int position, final float positionOffset, final int positionOffsetPixels) {
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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(final int position) {
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mCurrentPage = position;
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invalidate();
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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 onPageScrollStateChanged(final int 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 boolean onTouchEvent(@NonNull final android.view.MotionEvent ev) {
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if (super.onTouchEvent(ev)) return true;
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if (mViewPager == null || mViewPager.getAdapter().getCount() == 0) return false;
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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()) {
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mViewPager.endFakeDrag();
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}
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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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protected void onDraw(final Canvas canvas) {
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super.onDraw(canvas);
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if (mViewPager == null) return;
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final int count = mViewPager.getAdapter().getCount();
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if (count == 0) return;
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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 float lineWidthAndGap = mLineWidth + mGapWidth;
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final float indicatorWidth = count * lineWidthAndGap - mGapWidth;
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final float paddingTop = getPaddingTop();
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final float paddingLeft = getPaddingLeft();
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final float paddingRight = getPaddingRight();
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final float verticalOffset = paddingTop + (getHeight() - paddingTop - getPaddingBottom()) / 2.0f;
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float horizontalOffset = paddingLeft;
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if (mCentered) {
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horizontalOffset += (getWidth() - paddingLeft - paddingRight) / 2.0f - indicatorWidth / 2.0f;
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}
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// Draw stroked circles
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for (int i = 0; i < count; i++) {
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final float dx1 = horizontalOffset + i * lineWidthAndGap;
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final float dx2 = dx1 + mLineWidth;
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canvas.drawLine(dx1, verticalOffset, dx2, verticalOffset, i == mCurrentPage ? mPaintSelected
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: mPaintUnselected);
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}
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}
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@Override
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public Parcelable onSaveInstanceState() {
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final Parcelable superState = super.onSaveInstanceState();
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final 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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@Override
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public void onRestoreInstanceState(final Parcelable state) {
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final 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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protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
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setMeasuredDimension(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec));
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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 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 measureHeight(final int measureSpec) {
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float result;
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final int specMode = MeasureSpec.getMode(measureSpec);
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final 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 = mPaintSelected.getStrokeWidth() + getPaddingTop() + getPaddingBottom();
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// Respect AT_MOST value if that was what is called for by
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// 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 (int) Math.ceil(result);
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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 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 measureWidth(final int measureSpec) {
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float result;
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final int specMode = MeasureSpec.getMode(measureSpec);
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final 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 = getPaddingLeft() + getPaddingRight() + count * mLineWidth + (count - 1) * mGapWidth;
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// Respect AT_MOST value if that was what is called for by
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// 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 (int) Math.ceil(result);
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}
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static class SavedState extends BaseSavedState {
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public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
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@Override
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public SavedState createFromParcel(final 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(final int size) {
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return new SavedState[size];
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}
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};
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int currentPage;
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public SavedState(final Parcelable superState) {
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super(superState);
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}
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private SavedState(final 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(@NonNull final Parcel dest, final 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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}
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} |