diff options
Diffstat (limited to 'vdrmanager/src/com/viewpagerindicator/TitlePageIndicator.java')
| -rw-r--r-- | vdrmanager/src/com/viewpagerindicator/TitlePageIndicator.java | 672 |
1 files changed, 672 insertions, 0 deletions
diff --git a/vdrmanager/src/com/viewpagerindicator/TitlePageIndicator.java b/vdrmanager/src/com/viewpagerindicator/TitlePageIndicator.java new file mode 100644 index 0000000..c04f5ed --- /dev/null +++ b/vdrmanager/src/com/viewpagerindicator/TitlePageIndicator.java @@ -0,0 +1,672 @@ +/* + * Copyright (C) 2011 Patrik Akerfeldt + * Copyright (C) 2011 Francisco Figueiredo Jr. + * Copyright (C) 2011 Jake Wharton + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package com.viewpagerindicator; + +import java.util.ArrayList; + +import de.bjusystems.vdrmanager.R; +import android.content.Context; +import android.content.res.Resources; +import android.content.res.TypedArray; +import android.graphics.Canvas; +import android.graphics.Paint; +import android.graphics.Path; +import android.graphics.RectF; +import android.os.Parcel; +import android.os.Parcelable; +import android.support.v4.view.ViewPager; +import android.util.AttributeSet; +import android.view.MotionEvent; +import android.view.View; + +/** + * A TitlePageIndicator is a PageIndicator which displays the title of left view + * (if exist), the title of the current select view (centered) and the title of + * the right view (if exist). When the user scrolls the ViewPager then titles are + * also scrolled. + */ +public class TitlePageIndicator extends View implements PageIndicator { + /** + * Percentage indicating what percentage of the screen width away from + * center should the underline be fully faded. A value of 0.25 means that + * halfway between the center of the screen and an edge. + */ + private static final float SELECTION_FADE_PERCENTAGE = 0.25f; + + /** + * Percentage indicating what percentage of the screen width away from + * center should the selected text bold turn off. A value of 0.05 means + * that 10% between the center and an edge. + */ + private static final float BOLD_FADE_PERCENTAGE = 0.05f; + + public enum IndicatorStyle { + None(0), Triangle(1), Underline(2); + + public final int value; + + private IndicatorStyle(int value) { + this.value = value; + } + + public static IndicatorStyle fromValue(int value) { + for (IndicatorStyle style : IndicatorStyle.values()) { + if (style.value == value) { + return style; + } + } + return null; + } + } + + private ViewPager mViewPager; + private ViewPager.OnPageChangeListener mListener; + private TitleProvider mTitleProvider; + private int mCurrentPage; + private int mCurrentOffset; + private int mScrollState; + private final Paint mPaintText; + private boolean mBoldText; + private int mColorText; + private int mColorSelected; + private Path mPath; + private final Paint mPaintFooterLine; + private IndicatorStyle mFooterIndicatorStyle; + private final Paint mPaintFooterIndicator; + private float mFooterIndicatorHeight; + private float mFooterIndicatorUnderlinePadding; + private float mFooterPadding; + private float mTitlePadding; + private float mTopPadding; + /** Left and right side padding for not active view titles. */ + private float mClipPadding; + private float mFooterLineHeight; + + + public TitlePageIndicator(Context context) { + this(context, null); + } + + public TitlePageIndicator(Context context, AttributeSet attrs) { + this(context, attrs, R.attr.titlePageIndicatorStyle); + } + + public TitlePageIndicator(Context context, AttributeSet attrs, int defStyle) { + super(context, attrs, defStyle); + + //Load defaults from resources + final Resources res = getResources(); + final int defaultFooterColor = res.getColor(R.color.default_title_indicator_footer_color); + final float defaultFooterLineHeight = res.getDimension(R.dimen.default_title_indicator_footer_line_height); + final int defaultFooterIndicatorStyle = res.getInteger(R.integer.default_title_indicator_footer_indicator_style); + final float defaultFooterIndicatorHeight = res.getDimension(R.dimen.default_title_indicator_footer_indicator_height); + final float defaultFooterIndicatorUnderlinePadding = res.getDimension(R.dimen.default_title_indicator_footer_indicator_underline_padding); + final float defaultFooterPadding = res.getDimension(R.dimen.default_title_indicator_footer_padding); + final int defaultSelectedColor = res.getColor(R.color.default_title_indicator_selected_color); + final boolean defaultSelectedBold = res.getBoolean(R.bool.default_title_indicator_selected_bold); + final int defaultTextColor = res.getColor(R.color.default_title_indicator_text_color); + final float defaultTextSize = res.getDimension(R.dimen.default_title_indicator_text_size); + final float defaultTitlePadding = res.getDimension(R.dimen.default_title_indicator_title_padding); + final float defaultClipPadding = res.getDimension(R.dimen.default_title_indicator_clip_padding); + final float defaultTopPadding = res.getDimension(R.dimen.default_title_indicator_top_padding); + + //Retrieve styles attributes + TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TitlePageIndicator, defStyle, R.style.Widget_TitlePageIndicator); + + //Retrieve the colors to be used for this view and apply them. + mFooterLineHeight = a.getDimension(R.styleable.TitlePageIndicator_footerLineHeight, defaultFooterLineHeight); + mFooterIndicatorStyle = IndicatorStyle.fromValue(a.getInteger(R.styleable.TitlePageIndicator_footerIndicatorStyle, defaultFooterIndicatorStyle)); + mFooterIndicatorHeight = a.getDimension(R.styleable.TitlePageIndicator_footerIndicatorHeight, defaultFooterIndicatorHeight); + mFooterIndicatorUnderlinePadding = a.getDimension(R.styleable.TitlePageIndicator_footerIndicatorUnderlinePadding, defaultFooterIndicatorUnderlinePadding); + mFooterPadding = a.getDimension(R.styleable.TitlePageIndicator_footerPadding, defaultFooterPadding); + mTopPadding = a.getDimension(R.styleable.TitlePageIndicator_topPadding, defaultTopPadding); + mTitlePadding = a.getDimension(R.styleable.TitlePageIndicator_titlePadding, defaultTitlePadding); + mClipPadding = a.getDimension(R.styleable.TitlePageIndicator_clipPadding, defaultClipPadding); + mColorSelected = a.getColor(R.styleable.TitlePageIndicator_selectedColor, defaultSelectedColor); + mColorText = a.getColor(R.styleable.TitlePageIndicator_textColor, defaultTextColor); + mBoldText = a.getBoolean(R.styleable.TitlePageIndicator_selectedBold, defaultSelectedBold); + + final float textSize = a.getDimension(R.styleable.TitlePageIndicator_textSize, defaultTextSize); + final int footerColor = a.getColor(R.styleable.TitlePageIndicator_footerColor, defaultFooterColor); + mPaintText = new Paint(); + mPaintText.setTextSize(textSize); + mPaintText.setAntiAlias(true); + mPaintFooterLine = new Paint(); + mPaintFooterLine.setStyle(Paint.Style.FILL_AND_STROKE); + mPaintFooterLine.setStrokeWidth(mFooterLineHeight); + mPaintFooterLine.setColor(footerColor); + mPaintFooterIndicator = new Paint(); + mPaintFooterIndicator.setStyle(Paint.Style.FILL_AND_STROKE); + mPaintFooterIndicator.setColor(footerColor); + + a.recycle(); + } + + + public int getFooterColor() { + return mPaintFooterLine.getColor(); + } + + public void setFooterColor(int footerColor) { + mPaintFooterLine.setColor(footerColor); + mPaintFooterIndicator.setColor(footerColor); + invalidate(); + } + + public float getFooterLineHeight() { + return mFooterLineHeight; + } + + public void setFooterLineHeight(float footerLineHeight) { + mFooterLineHeight = footerLineHeight; + mPaintFooterLine.setStrokeWidth(mFooterLineHeight); + invalidate(); + } + + public float getFooterIndicatorHeight() { + return mFooterIndicatorHeight; + } + + public void setFooterIndicatorHeight(float footerTriangleHeight) { + mFooterIndicatorHeight = footerTriangleHeight; + invalidate(); + } + + public float getFooterIndicatorPadding() { + return mFooterPadding; + } + + public void setFooterIndicatorPadding(float footerIndicatorPadding) { + mFooterPadding = footerIndicatorPadding; + invalidate(); + } + + public IndicatorStyle getFooterIndicatorStyle() { + return mFooterIndicatorStyle; + } + + public void setFooterIndicatorStyle(IndicatorStyle indicatorStyle) { + mFooterIndicatorStyle = indicatorStyle; + invalidate(); + } + + public int getSelectedColor() { + return mColorSelected; + } + + public void setSelectedColor(int selectedColor) { + mColorSelected = selectedColor; + invalidate(); + } + + public boolean isSelectedBold() { + return mBoldText; + } + + public void setSelectedBold(boolean selectedBold) { + mBoldText = selectedBold; + invalidate(); + } + + public int getTextColor() { + return mColorText; + } + + public void setTextColor(int textColor) { + mPaintText.setColor(textColor); + mColorText = textColor; + invalidate(); + } + + public float getTextSize() { + return mPaintText.getTextSize(); + } + + public void setTextSize(float textSize) { + mPaintText.setTextSize(textSize); + invalidate(); + } + + public float getTitlePadding() { + return this.mTitlePadding; + } + + public void setTitlePadding(float titlePadding) { + mTitlePadding = titlePadding; + invalidate(); + } + + public float getTopPadding() { + return this.mTopPadding; + } + + public void setTopPadding(float topPadding) { + mTopPadding = topPadding; + invalidate(); + } + + public float getClipPadding() { + return this.mClipPadding; + } + + public void setClipPadding(float clipPadding) { + mClipPadding = clipPadding; + invalidate(); + } + + /* + * (non-Javadoc) + * + * @see android.view.View#onDraw(android.graphics.Canvas) + */ + @Override + protected void onDraw(Canvas canvas) { + super.onDraw(canvas); + + //Calculate views bounds + ArrayList<RectF> bounds = calculateAllBounds(mPaintText); + + final int count = mViewPager.getAdapter().getCount(); + final int countMinusOne = count - 1; + final float halfWidth = getWidth() / 2f; + final int left = getLeft(); + final float leftClip = left + mClipPadding; + final int width = getWidth(); + final int height = getHeight(); + final int right = left + width; + final float rightClip = right - mClipPadding; + + int page = mCurrentPage; + float offsetPercent; + if (mCurrentOffset <= halfWidth) { + offsetPercent = 1.0f * mCurrentOffset / width; + } else { + page += 1; + offsetPercent = 1.0f * (width - mCurrentOffset) / width; + } + final boolean currentSelected = (offsetPercent <= SELECTION_FADE_PERCENTAGE); + final boolean currentBold = (offsetPercent <= BOLD_FADE_PERCENTAGE); + final float selectedPercent = (SELECTION_FADE_PERCENTAGE - offsetPercent) / SELECTION_FADE_PERCENTAGE; + + //Verify if the current view must be clipped to the screen + RectF curPageBound = bounds.get(mCurrentPage); + float curPageWidth = curPageBound.right - curPageBound.left; + if (curPageBound.left < leftClip) { + //Try to clip to the screen (left side) + clipViewOnTheLeft(curPageBound, curPageWidth, left); + } + if (curPageBound.right > rightClip) { + //Try to clip to the screen (right side) + clipViewOnTheRight(curPageBound, curPageWidth, right); + } + + //Left views starting from the current position + if (mCurrentPage > 0) { + for (int i = mCurrentPage - 1; i >= 0; i--) { + RectF bound = bounds.get(i); + //Is left side is outside the screen + if (bound.left < leftClip) { + float w = bound.right - bound.left; + //Try to clip to the screen (left side) + clipViewOnTheLeft(bound, w, left); + //Except if there's an intersection with the right view + RectF rightBound = bounds.get(i + 1); + //Intersection + if (bound.right + mTitlePadding > rightBound.left) { + bound.left = rightBound.left - w - mTitlePadding; + bound.right = bound.left + w; + } + } + } + } + //Right views starting from the current position + if (mCurrentPage < countMinusOne) { + for (int i = mCurrentPage + 1 ; i < count; i++) { + RectF bound = bounds.get(i); + //If right side is outside the screen + if (bound.right > rightClip) { + float w = bound.right - bound.left; + //Try to clip to the screen (right side) + clipViewOnTheRight(bound, w, right); + //Except if there's an intersection with the left view + RectF leftBound = bounds.get(i - 1); + //Intersection + if (bound.left - mTitlePadding < leftBound.right) { + bound.left = leftBound.right + mTitlePadding; + bound.right = bound.left + w; + } + } + } + } + + //Now draw views + for (int i = 0; i < count; i++) { + //Get the title + RectF bound = bounds.get(i); + //Only if one side is visible + if ((bound.left > left && bound.left < right) || (bound.right > left && bound.right < right)) { + final boolean currentPage = (i == page); + //Only set bold if we are within bounds + mPaintText.setFakeBoldText(currentPage && currentBold && mBoldText); + + //Draw text as unselected + mPaintText.setColor(mColorText); + canvas.drawText(mTitleProvider.getTitle(i), bound.left, bound.bottom + mTopPadding, mPaintText); + + //If we are within the selected bounds draw the selected text + if (currentPage && currentSelected) { + mPaintText.setColor(mColorSelected); + mPaintText.setAlpha((int)((mColorSelected >>> 24) * selectedPercent)); + canvas.drawText(mTitleProvider.getTitle(i), bound.left, bound.bottom + mTopPadding, mPaintText); + } + } + } + + //Draw the footer line + mPath = new Path(); + mPath.moveTo(0, height - mFooterLineHeight / 2f); + mPath.lineTo(width, height - mFooterLineHeight / 2f); + mPath.close(); + canvas.drawPath(mPath, mPaintFooterLine); + + switch (mFooterIndicatorStyle) { + case Triangle: + mPath = new Path(); + mPath.moveTo(halfWidth, height - mFooterLineHeight - mFooterIndicatorHeight); + mPath.lineTo(halfWidth + mFooterIndicatorHeight, height - mFooterLineHeight); + mPath.lineTo(halfWidth - mFooterIndicatorHeight, height - mFooterLineHeight); + mPath.close(); + canvas.drawPath(mPath, mPaintFooterIndicator); + break; + + case Underline: + if (!currentSelected) { + break; + } + + RectF underlineBounds = bounds.get(page); + mPath = new Path(); + mPath.moveTo(underlineBounds.left - mFooterIndicatorUnderlinePadding, height - mFooterLineHeight); + mPath.lineTo(underlineBounds.right + mFooterIndicatorUnderlinePadding, height - mFooterLineHeight); + mPath.lineTo(underlineBounds.right + mFooterIndicatorUnderlinePadding, height - mFooterLineHeight - mFooterIndicatorHeight); + mPath.lineTo(underlineBounds.left - mFooterIndicatorUnderlinePadding, height - mFooterLineHeight - mFooterIndicatorHeight); + mPath.close(); + + mPaintFooterIndicator.setAlpha((int)(0xFF * selectedPercent)); + canvas.drawPath(mPath, mPaintFooterIndicator); + mPaintFooterIndicator.setAlpha(0xFF); + break; + } + } + + @Override + public boolean onTouchEvent(MotionEvent event) { + if (event.getAction() == MotionEvent.ACTION_DOWN) { + final int count = mViewPager.getAdapter().getCount(); + final int width = getWidth(); + final float halfWidth = width / 2f; + final float sixthWidth = width / 6f; + + if ((mCurrentPage > 0) && (event.getX() < halfWidth - sixthWidth)) { + mViewPager.setCurrentItem(mCurrentPage - 1); + return true; + } else if ((mCurrentPage < count - 1) && (event.getX() > halfWidth + sixthWidth)) { + mViewPager.setCurrentItem(mCurrentPage + 1); + return true; + } + } + + return super.onTouchEvent(event); + } + + /** + * Set bounds for the right textView including clip padding. + * + * @param curViewBound + * current bounds. + * @param curViewWidth + * width of the view. + */ + private void clipViewOnTheRight(RectF curViewBound, float curViewWidth, int right) { + curViewBound.right = right - mClipPadding; + curViewBound.left = curViewBound.right - curViewWidth; + } + + /** + * Set bounds for the left textView including clip padding. + * + * @param curViewBound + * current bounds. + * @param curViewWidth + * width of the view. + */ + private void clipViewOnTheLeft(RectF curViewBound, float curViewWidth, int left) { + curViewBound.left = left + mClipPadding; + curViewBound.right = mClipPadding + curViewWidth; + } + + /** + * Calculate views bounds and scroll them according to the current index + * + * @param paint + * @param currentIndex + * @return + */ + private ArrayList<RectF> calculateAllBounds(Paint paint) { + ArrayList<RectF> list = new ArrayList<RectF>(); + //For each views (If no values then add a fake one) + final int count = mViewPager.getAdapter().getCount(); + final int width = getWidth(); + final int halfWidth = width / 2; + for (int i = 0; i < count; i++) { + RectF bounds = calcBounds(i, paint); + float w = (bounds.right - bounds.left); + float h = (bounds.bottom - bounds.top); + bounds.left = (halfWidth) - (w / 2) - mCurrentOffset + ((i - mCurrentPage) * width); + bounds.right = bounds.left + w; + bounds.top = 0; + bounds.bottom = h; + list.add(bounds); + } + + return list; + } + + /** + * Calculate the bounds for a view's title + * + * @param index + * @param paint + * @return + */ + private RectF calcBounds(int index, Paint paint) { + //Calculate the text bounds + RectF bounds = new RectF(); + bounds.right = paint.measureText(mTitleProvider.getTitle(index)); + bounds.bottom = paint.descent() - paint.ascent(); + return bounds; + } + + + public void setViewPager(ViewPager view) { + if (view.getAdapter() == null) { + throw new IllegalStateException("ViewPager does not have adapter instance."); + } + if (!(view.getAdapter() instanceof TitleProvider)) { + throw new IllegalStateException("ViewPager adapter must implement TitleProvider to be used with TitlePageIndicator."); + } + mViewPager = view; + mViewPager.setOnPageChangeListener(this); + mTitleProvider = (TitleProvider)mViewPager.getAdapter(); + invalidate(); + } + + + public void setViewPager(ViewPager view, int initialPosition) { + setViewPager(view); + setCurrentItem(initialPosition); + } + + + public void setCurrentItem(int item) { + if (mViewPager == null) { + throw new IllegalStateException("ViewPager has not been bound."); + } + mViewPager.setCurrentItem(item); + mCurrentPage = item; + invalidate(); + } + + public void onPageScrollStateChanged(int state) { + mScrollState = state; + + if (mListener != null) { + mListener.onPageScrollStateChanged(state); + } + } + + + public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { + mCurrentPage = position; + mCurrentOffset = positionOffsetPixels; + invalidate(); + + if (mListener != null) { + mListener.onPageScrolled(position, positionOffset, positionOffsetPixels); + } + } + + + public void onPageSelected(int position) { + if (mScrollState == ViewPager.SCROLL_STATE_IDLE) { + mCurrentPage = position; + invalidate(); + } + + if (mListener != null) { + mListener.onPageSelected(position); + } + } + + public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) { + mListener = listener; + } + + /* + * (non-Javadoc) + * + * @see android.view.View#onMeasure(int, int) + */ + @Override + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { + setMeasuredDimension(measureWidth(widthMeasureSpec), measureHeight(heightMeasureSpec)); + } + + /** + * Determines the width of this view + * + * @param measureSpec + * A measureSpec packed into an int + * @return The width of the view, honoring constraints from measureSpec + */ + private int measureWidth(int measureSpec) { + int result = 0; + int specMode = MeasureSpec.getMode(measureSpec); + int specSize = MeasureSpec.getSize(measureSpec); + + if (specMode != MeasureSpec.EXACTLY) { + throw new IllegalStateException(getClass().getSimpleName() + " can only be used in EXACTLY mode."); + } + result = specSize; + return result; + } + + /** + * Determines the height of this view + * + * @param measureSpec + * A measureSpec packed into an int + * @return The height of the view, honoring constraints from measureSpec + */ + private int measureHeight(int measureSpec) { + float result = 0; + int specMode = MeasureSpec.getMode(measureSpec); + int specSize = MeasureSpec.getSize(measureSpec); + + if (specMode == MeasureSpec.EXACTLY) { + //We were told how big to be + result = specSize; + } else { + //Calculate the text bounds + RectF bounds = new RectF(); + bounds.bottom = mPaintText.descent()-mPaintText.ascent(); + result = bounds.bottom - bounds.top + mFooterLineHeight + mFooterPadding + mTopPadding; + if (mFooterIndicatorStyle != IndicatorStyle.None) { + result += mFooterIndicatorHeight; + } + } + return (int)result; + } + + @Override + public void onRestoreInstanceState(Parcelable state) { + SavedState savedState = (SavedState)state; + super.onRestoreInstanceState(savedState.getSuperState()); + mCurrentPage = savedState.currentPage; + requestLayout(); + } + + @Override + public Parcelable onSaveInstanceState() { + Parcelable superState = super.onSaveInstanceState(); + SavedState savedState = new SavedState(superState); + savedState.currentPage = mCurrentPage; + return savedState; + } + + 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); + } + + public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() { + + public SavedState createFromParcel(Parcel in) { + return new SavedState(in); + } + + + public SavedState[] newArray(int size) { + return new SavedState[size]; + } + }; + } +} |