diff options
author | Andrew Mast <andy@cyngn.com> | 2014-05-13 21:58:33 -0700 |
---|---|---|
committer | Andy Mast <andy@cyngn.com> | 2014-05-15 14:43:41 +0000 |
commit | 472bd3327394eb0db591c626e216712c0f9f58b0 (patch) | |
tree | d5685794f6172dae05c8716823822c67255517d6 /src/com/viewpagerindicator/CirclePageIndicator.java | |
parent | cf8f5e7f8c7195ae14827caa71e291d52d3e236e (diff) | |
download | packages_apps_ThemeChooser-472bd3327394eb0db591c626e216712c0f9f58b0.zip packages_apps_ThemeChooser-472bd3327394eb0db591c626e216712c0f9f58b0.tar.gz packages_apps_ThemeChooser-472bd3327394eb0db591c626e216712c0f9f58b0.tar.bz2 |
Add a page indicator to the theme preview screen
Leverages Jake Wharton's ViewPagerIndicator
Change-Id: I17c5ff60a7a2d62fa8fcf652382dcfcd807d0397
Diffstat (limited to 'src/com/viewpagerindicator/CirclePageIndicator.java')
-rw-r--r-- | src/com/viewpagerindicator/CirclePageIndicator.java | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/src/com/viewpagerindicator/CirclePageIndicator.java b/src/com/viewpagerindicator/CirclePageIndicator.java new file mode 100644 index 0000000..8310d58 --- /dev/null +++ b/src/com/viewpagerindicator/CirclePageIndicator.java @@ -0,0 +1,556 @@ +/* + * Copyright (C) 2011 Patrik Akerfeldt + * 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 android.content.Context; +import android.content.res.Resources; +import android.content.res.TypedArray; +import android.graphics.Canvas; +import android.graphics.Paint; +import android.graphics.Paint.Style; +import android.graphics.drawable.Drawable; +import android.os.Parcel; +import android.os.Parcelable; +import android.support.v4.view.MotionEventCompat; +import android.support.v4.view.ViewConfigurationCompat; +import android.support.v4.view.ViewPager; +import android.util.AttributeSet; +import android.view.MotionEvent; +import android.view.View; +import android.view.ViewConfiguration; + +import static android.graphics.Paint.ANTI_ALIAS_FLAG; +import static android.widget.LinearLayout.HORIZONTAL; +import static android.widget.LinearLayout.VERTICAL; +import org.cyanogenmod.theme.chooser.R; + +/** + * Draws circles (one for each view). The current view position is filled and + * others are only stroked. + */ +public class CirclePageIndicator extends View implements PageIndicator { + private static final int INVALID_POINTER = -1; + + private float mRadius; + private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG); + private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG); + private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG); + private ViewPager mViewPager; + private ViewPager.OnPageChangeListener mListener; + private int mCurrentPage; + private int mSnapPage; + private float mPageOffset; + private int mScrollState; + private int mOrientation; + private boolean mCentered; + private boolean mSnap; + + private int mTouchSlop; + private float mLastMotionX = -1; + private int mActivePointerId = INVALID_POINTER; + private boolean mIsDragging; + + + public CirclePageIndicator(Context context) { + this(context, null); + } + + public CirclePageIndicator(Context context, AttributeSet attrs) { + this(context, attrs, R.attr.vpiCirclePageIndicatorStyle); + } + + public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle) { + super(context, attrs, defStyle); + if (isInEditMode()) return; + + //Load defaults from resources + final Resources res = getResources(); + final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color); + final int defaultFillColor = res.getColor(R.color.default_circle_indicator_fill_color); + final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation); + final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color); + final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width); + final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius); + final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered); + final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap); + + //Retrieve styles attributes + TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0); + + mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered); + mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation); + mPaintPageFill.setStyle(Style.FILL); + mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor)); + mPaintStroke.setStyle(Style.STROKE); + mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor)); + mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth)); + mPaintFill.setStyle(Style.FILL); + mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor)); + mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius); + mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap); + + Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background); + if (background != null) { + setBackgroundDrawable(background); + } + + a.recycle(); + + final ViewConfiguration configuration = ViewConfiguration.get(context); + mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration); + } + + + public void setCentered(boolean centered) { + mCentered = centered; + invalidate(); + } + + public boolean isCentered() { + return mCentered; + } + + public void setPageColor(int pageColor) { + mPaintPageFill.setColor(pageColor); + invalidate(); + } + + public int getPageColor() { + return mPaintPageFill.getColor(); + } + + public void setFillColor(int fillColor) { + mPaintFill.setColor(fillColor); + invalidate(); + } + + public int getFillColor() { + return mPaintFill.getColor(); + } + + public void setOrientation(int orientation) { + switch (orientation) { + case HORIZONTAL: + case VERTICAL: + mOrientation = orientation; + requestLayout(); + break; + + default: + throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL."); + } + } + + public int getOrientation() { + return mOrientation; + } + + public void setStrokeColor(int strokeColor) { + mPaintStroke.setColor(strokeColor); + invalidate(); + } + + public int getStrokeColor() { + return mPaintStroke.getColor(); + } + + public void setStrokeWidth(float strokeWidth) { + mPaintStroke.setStrokeWidth(strokeWidth); + invalidate(); + } + + public float getStrokeWidth() { + return mPaintStroke.getStrokeWidth(); + } + + public void setRadius(float radius) { + mRadius = radius; + invalidate(); + } + + public float getRadius() { + return mRadius; + } + + public void setSnap(boolean snap) { + mSnap = snap; + invalidate(); + } + + public boolean isSnap() { + return mSnap; + } + + @Override + protected void onDraw(Canvas canvas) { + super.onDraw(canvas); + + if (mViewPager == null) { + return; + } + final int count = mViewPager.getAdapter().getCount(); + if (count == 0) { + return; + } + + if (mCurrentPage >= count) { + setCurrentItem(count - 1); + return; + } + + int longSize; + int longPaddingBefore; + int longPaddingAfter; + int shortPaddingBefore; + if (mOrientation == HORIZONTAL) { + longSize = getWidth(); + longPaddingBefore = getPaddingLeft(); + longPaddingAfter = getPaddingRight(); + shortPaddingBefore = getPaddingTop(); + } else { + longSize = getHeight(); + longPaddingBefore = getPaddingTop(); + longPaddingAfter = getPaddingBottom(); + shortPaddingBefore = getPaddingLeft(); + } + + final float threeRadius = mRadius * 3; + final float shortOffset = shortPaddingBefore + mRadius; + float longOffset = longPaddingBefore + mRadius; + if (mCentered) { + longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - ((count * threeRadius) / 2.0f); + } + + float dX; + float dY; + + float pageFillRadius = mRadius; + if (mPaintStroke.getStrokeWidth() > 0) { + pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f; + } + + //Draw stroked circles + for (int iLoop = 0; iLoop < count; iLoop++) { + float drawLong = longOffset + (iLoop * threeRadius); + if (mOrientation == HORIZONTAL) { + dX = drawLong; + dY = shortOffset; + } else { + dX = shortOffset; + dY = drawLong; + } + // Only paint fill if not completely transparent + if (mPaintPageFill.getAlpha() > 0) { + canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill); + } + + // Only paint stroke if a stroke width was non-zero + if (pageFillRadius != mRadius) { + canvas.drawCircle(dX, dY, mRadius, mPaintStroke); + } + } + + //Draw the filled circle according to the current scroll + float cx = (mSnap ? mSnapPage : mCurrentPage) * threeRadius; + if (!mSnap) { + cx += mPageOffset * threeRadius; + } + if (mOrientation == HORIZONTAL) { + dX = longOffset + cx; + dY = shortOffset; + } else { + dX = shortOffset; + dY = longOffset + cx; + } + canvas.drawCircle(dX, dY, mRadius, mPaintFill); + } + + public boolean onTouchEvent(android.view.MotionEvent ev) { + if (super.onTouchEvent(ev)) { + return true; + } + if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0)) { + return false; + } + + final int action = ev.getAction() & MotionEventCompat.ACTION_MASK; + switch (action) { + case MotionEvent.ACTION_DOWN: + mActivePointerId = MotionEventCompat.getPointerId(ev, 0); + mLastMotionX = ev.getX(); + break; + + case MotionEvent.ACTION_MOVE: { + final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId); + final float x = MotionEventCompat.getX(ev, activePointerIndex); + final float deltaX = x - mLastMotionX; + + if (!mIsDragging) { + if (Math.abs(deltaX) > mTouchSlop) { + mIsDragging = true; + } + } + + if (mIsDragging) { + mLastMotionX = x; + if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) { + mViewPager.fakeDragBy(deltaX); + } + } + + break; + } + + case MotionEvent.ACTION_CANCEL: + case MotionEvent.ACTION_UP: + if (!mIsDragging) { + final int count = mViewPager.getAdapter().getCount(); + final int width = getWidth(); + final float halfWidth = width / 2f; + final float sixthWidth = width / 6f; + + if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) { + if (action != MotionEvent.ACTION_CANCEL) { + mViewPager.setCurrentItem(mCurrentPage - 1); + } + return true; + } else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) { + if (action != MotionEvent.ACTION_CANCEL) { + mViewPager.setCurrentItem(mCurrentPage + 1); + } + return true; + } + } + + mIsDragging = false; + mActivePointerId = INVALID_POINTER; + if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag(); + break; + + case MotionEventCompat.ACTION_POINTER_DOWN: { + final int index = MotionEventCompat.getActionIndex(ev); + mLastMotionX = MotionEventCompat.getX(ev, index); + mActivePointerId = MotionEventCompat.getPointerId(ev, index); + break; + } + + case MotionEventCompat.ACTION_POINTER_UP: + final int pointerIndex = MotionEventCompat.getActionIndex(ev); + final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex); + if (pointerId == mActivePointerId) { + final int newPointerIndex = pointerIndex == 0 ? 1 : 0; + mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex); + } + mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId)); + break; + } + + return true; + } + + @Override + public void setViewPager(ViewPager view) { + if (mViewPager == view) { + return; + } + if (mViewPager != null) { + mViewPager.setOnPageChangeListener(null); + } + if (view.getAdapter() == null) { + throw new IllegalStateException("ViewPager does not have adapter instance."); + } + mViewPager = view; + mViewPager.setOnPageChangeListener(this); + invalidate(); + } + + @Override + public void setViewPager(ViewPager view, int initialPosition) { + setViewPager(view); + setCurrentItem(initialPosition); + } + + @Override + public void setCurrentItem(int item) { + if (mViewPager == null) { + throw new IllegalStateException("ViewPager has not been bound."); + } + mViewPager.setCurrentItem(item); + mCurrentPage = item; + invalidate(); + } + + @Override + public void notifyDataSetChanged() { + invalidate(); + } + + @Override + public void onPageScrollStateChanged(int state) { + mScrollState = state; + + if (mListener != null) { + mListener.onPageScrollStateChanged(state); + } + } + + @Override + public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { + mCurrentPage = position; + mPageOffset = positionOffset; + invalidate(); + + if (mListener != null) { + mListener.onPageScrolled(position, positionOffset, positionOffsetPixels); + } + } + + @Override + public void onPageSelected(int position) { + if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) { + mCurrentPage = position; + mSnapPage = position; + invalidate(); + } + + if (mListener != null) { + mListener.onPageSelected(position); + } + } + + @Override + 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) { + if (mOrientation == HORIZONTAL) { + setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec)); + } else { + setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(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 measureLong(int measureSpec) { + int result; + int specMode = MeasureSpec.getMode(measureSpec); + int specSize = MeasureSpec.getSize(measureSpec); + + if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) { + //We were told how big to be + result = specSize; + } else { + //Calculate the width according the views count + final int count = mViewPager.getAdapter().getCount(); + result = (int)(getPaddingLeft() + getPaddingRight() + + (count * 2 * mRadius) + (count - 1) * mRadius + 1); + //Respect AT_MOST value if that was what is called for by measureSpec + if (specMode == MeasureSpec.AT_MOST) { + result = Math.min(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 measureShort(int measureSpec) { + int result; + int specMode = MeasureSpec.getMode(measureSpec); + int specSize = MeasureSpec.getSize(measureSpec); + + if (specMode == MeasureSpec.EXACTLY) { + //We were told how big to be + result = specSize; + } else { + //Measure the height + result = (int)(2 * mRadius + getPaddingTop() + getPaddingBottom() + 1); + //Respect AT_MOST value if that was what is called for by measureSpec + if (specMode == MeasureSpec.AT_MOST) { + result = Math.min(result, specSize); + } + } + return result; + } + + @Override + public void onRestoreInstanceState(Parcelable state) { + SavedState savedState = (SavedState)state; + super.onRestoreInstanceState(savedState.getSuperState()); + mCurrentPage = savedState.currentPage; + mSnapPage = 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); + } + + @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]; + } + }; + } +} |