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/*
* Copyright © 2018 The Android Open Source Project
* Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.widget;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.annotation.TargetApi;
import android.content.res.ColorStateList;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Path.Direction;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff.Mode;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Region;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.ColorInt;
import android.support.annotation.IntRange;
import android.support.annotation.Nullable;
import android.util.FloatProperty;
@TargetApi(Build.VERSION_CODES.N)
public class SlashDrawable extends Drawable {
private static final float CORNER_RADIUS = Build.VERSION.SDK_INT < Build.VERSION_CODES.O ? 0f : 1f;
private static final long QS_ANIM_LENGTH = 350;
private final Path mPath = new Path();
private final Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
// These values are derived in un-rotated (vertical) orientation
private static final float SLASH_WIDTH = 1.8384776f;
private static final float SLASH_HEIGHT = 28f;
private static final float CENTER_X = 10.65f;
private static final float CENTER_Y = 11.869239f;
private static final float SCALE = 24f;
// Bottom is derived during animation
private static final float LEFT = (CENTER_X - (SLASH_WIDTH / 2)) / SCALE;
private static final float TOP = (CENTER_Y - (SLASH_HEIGHT / 2)) / SCALE;
private static final float RIGHT = (CENTER_X + (SLASH_WIDTH / 2)) / SCALE;
// Draw the slash washington-monument style; rotate to no-u-turn style
private static final float DEFAULT_ROTATION = -45f;
private final Drawable mDrawable;
private final RectF mSlashRect = new RectF(0, 0, 0, 0);
private float mRotation;
private boolean mSlashed;
private boolean mAnimationEnabled = true;
public SlashDrawable(final Drawable d) {
mDrawable = d;
}
@Override
public int getIntrinsicHeight() {
return mDrawable.getIntrinsicHeight();
}
@Override
public int getIntrinsicWidth() {
return mDrawable.getIntrinsicWidth();
}
@Override
protected void onBoundsChange(final Rect bounds) {
super.onBoundsChange(bounds);
mDrawable.setBounds(bounds);
}
public void setRotation(final float rotation) {
if (mRotation == rotation)
return;
mRotation = rotation;
invalidateSelf();
}
public void setAnimationEnabled(final boolean enabled) {
mAnimationEnabled = enabled;
}
// Animate this value on change
private float mCurrentSlashLength;
private static final FloatProperty mSlashLengthProp = new FloatProperty<SlashDrawable>("slashLength") {
@Override
public void setValue(final SlashDrawable object, final float value) {
object.mCurrentSlashLength = value;
}
@Override
public Float get(final SlashDrawable object) {
return object.mCurrentSlashLength;
}
};
@SuppressWarnings("unchecked")
public void setSlashed(final boolean slashed) {
if (mSlashed == slashed) return;
mSlashed = slashed;
final float end = mSlashed ? SLASH_HEIGHT / SCALE : 0f;
final float start = mSlashed ? 0f : SLASH_HEIGHT / SCALE;
if (mAnimationEnabled) {
final ObjectAnimator anim = ObjectAnimator.ofFloat(this, mSlashLengthProp, start, end);
anim.addUpdateListener((ValueAnimator valueAnimator) -> invalidateSelf());
anim.setDuration(QS_ANIM_LENGTH);
anim.start();
} else {
mCurrentSlashLength = end;
invalidateSelf();
}
}
@SuppressWarnings("deprecation")
@Override
public void draw(final Canvas canvas) {
canvas.save();
final Matrix m = new Matrix();
final int width = getBounds().width();
final int height = getBounds().height();
final float radiusX = scale(CORNER_RADIUS, width);
final float radiusY = scale(CORNER_RADIUS, height);
updateRect(
scale(LEFT, width),
scale(TOP, height),
scale(RIGHT, width),
scale(TOP + mCurrentSlashLength, height)
);
mPath.reset();
// Draw the slash vertically
mPath.addRoundRect(mSlashRect, radiusX, radiusY, Direction.CW);
// Rotate -45 + desired rotation
m.setRotate(mRotation + DEFAULT_ROTATION, width / 2, height / 2);
mPath.transform(m);
canvas.drawPath(mPath, mPaint);
// Rotate back to vertical
m.setRotate(-mRotation - DEFAULT_ROTATION, width / 2, height / 2);
mPath.transform(m);
// Draw another rect right next to the first, for clipping
m.setTranslate(mSlashRect.width(), 0);
mPath.transform(m);
mPath.addRoundRect(mSlashRect, 1.0f * width, 1.0f * height, Direction.CW);
m.setRotate(mRotation + DEFAULT_ROTATION, width / 2, height / 2);
mPath.transform(m);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
canvas.clipPath(mPath, Region.Op.DIFFERENCE);
else
canvas.clipOutPath(mPath);
mDrawable.draw(canvas);
canvas.restore();
}
private float scale(final float frac, final int width) {
return frac * width;
}
private void updateRect(final float left, final float top, final float right, final float bottom) {
mSlashRect.left = left;
mSlashRect.top = top;
mSlashRect.right = right;
mSlashRect.bottom = bottom;
}
@Override
public void setTint(@ColorInt final int tintColor) {
super.setTint(tintColor);
mDrawable.setTint(tintColor);
mPaint.setColor(tintColor);
}
@Override
public void setTintList(@Nullable final ColorStateList tint) {
super.setTintList(tint);
setDrawableTintList(tint);
mPaint.setColor(tint == null ? 0 : tint.getDefaultColor());
invalidateSelf();
}
private void setDrawableTintList(@Nullable final ColorStateList tint) {
mDrawable.setTintList(tint);
}
@Override
public void setTintMode(final Mode tintMode) {
super.setTintMode(tintMode);
mDrawable.setTintMode(tintMode);
}
@Override
public void setAlpha(@IntRange(from = 0, to = 255) final int alpha) {
mDrawable.setAlpha(alpha);
mPaint.setAlpha(alpha);
}
@Override
public void setColorFilter(@Nullable final ColorFilter colorFilter) {
mDrawable.setColorFilter(colorFilter);
mPaint.setColorFilter(colorFilter);
}
@Override
public int getOpacity() {
return PixelFormat.OPAQUE;
}
}
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