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package com.android.launcher3.pageindicators;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Looper;
import android.support.v4.graphics.ColorUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.util.Property;
import android.view.View;
import android.view.ViewConfiguration;
import com.android.launcher3.Utilities;
import com.android.launcher3.dynamicui.ExtractedColors;
/**
* A PageIndicator that briefly shows a fraction of a line when moving between pages.
*
* The fraction is 1 / number of pages and the position is based on the progress of the page scroll.
*/
public class PageIndicatorLine extends View implements PageIndicator {
private static final String TAG = "PageIndicatorLine";
private static final int LINE_FADE_DURATION = ViewConfiguration.getScrollBarFadeDuration();
private static final int LINE_FADE_DELAY = ViewConfiguration.getScrollDefaultDelay();
public static final int WHITE_ALPHA = (int) (0.70f * 255);
public static final int BLACK_ALPHA = (int) (0.65f * 255);
private final Handler mHandler = new Handler(Looper.getMainLooper());
private ValueAnimator mLineAlphaAnimator;
private int mAlpha = 0;
private float mProgress = 0f;
private int mNumPages = 1;
private Paint mLinePaint;
private static final Property<PageIndicatorLine, Integer> PAINT_ALPHA
= new Property<PageIndicatorLine, Integer>(Integer.class, "paint_alpha") {
@Override
public Integer get(PageIndicatorLine obj) {
return obj.mLinePaint.getAlpha();
}
@Override
public void set(PageIndicatorLine obj, Integer alpha) {
obj.mLinePaint.setAlpha(alpha);
obj.invalidate();
}
};
private Runnable mHideLineRunnable = new Runnable() {
@Override
public void run() {
animateLineToAlpha(0);
}
};
public PageIndicatorLine(Context context) {
this(context, null);
}
public PageIndicatorLine(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public PageIndicatorLine(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mLinePaint = new Paint();
mLinePaint.setAlpha(0);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mNumPages == 0) {
return;
}
int availableWidth = canvas.getWidth();
int lineWidth = availableWidth / mNumPages;
int lineLeft = (int) (mProgress * (availableWidth - lineWidth));
int lineRight = lineLeft + lineWidth;
canvas.drawRect(lineLeft, 0, lineRight, canvas.getHeight(), mLinePaint);
}
@Override
public View getView() {
return this;
}
@Override
public void setScroll(int currentScroll, int totalScroll) {
if (getAlpha() == 0) {
return;
}
animateLineToAlpha(mAlpha);
mProgress = Utilities.boundToRange(((float) currentScroll) / totalScroll, 0f, 1f);;
invalidate();
// Hide after a brief period.
mHandler.removeCallbacksAndMessages(null);
mHandler.postDelayed(mHideLineRunnable, LINE_FADE_DELAY);
}
@Override
public void setActiveMarker(int activePage) {
}
@Override
public void addMarker() {
mNumPages++;
}
@Override
public void removeMarker() {
mNumPages--;
}
@Override
public void setMarkersCount(int numMarkers) {
mNumPages = numMarkers;
}
/**
* The line's color will be:
* - mostly opaque white if the hotseat is white (ignoring alpha)
* - mostly opaque black if the hotseat is black (ignoring alpha)
*/
public void updateColor(ExtractedColors extractedColors) {
int originalLineAlpha = mLinePaint.getAlpha();
int color = extractedColors.getColor(ExtractedColors.HOTSEAT_INDEX, Color.TRANSPARENT);
if (color != Color.TRANSPARENT) {
color = ColorUtils.setAlphaComponent(color, 255);
if (color == Color.BLACK) {
mAlpha = BLACK_ALPHA;
} else if (color == Color.WHITE) {
mAlpha = WHITE_ALPHA;
} else {
Log.e(TAG, "Setting workspace page indicators to an unsupported color: #"
+ Integer.toHexString(color));
}
mLinePaint.setColor(color);
mLinePaint.setAlpha(originalLineAlpha);
}
}
private void animateLineToAlpha(int alpha) {
if (mLineAlphaAnimator != null) {
// An animation is already running, so ignore the new animation request unless we are
// trying to hide the line, in which case we always allow the animation.
if (alpha != 0) {
return;
}
mLineAlphaAnimator.cancel();
}
mLineAlphaAnimator = ObjectAnimator.ofInt(this, PAINT_ALPHA, alpha);
mLineAlphaAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
mLineAlphaAnimator = null;
}
});
mLineAlphaAnimator.setDuration(LINE_FADE_DURATION);
mLineAlphaAnimator.start();
}
}
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