/*
* Copyright (c) 2016 Tim Malseed
*
* 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 io.hefuyi.listener.widget.fastscroller;
import android.animation.ObjectAnimator;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.text.TextUtils;
import io.hefuyi.listener.util.DensityUtil;
import io.hefuyi.listener.util.ListenerUtil;
class FastScrollPopup {
private FastScrollRecyclerView mRecyclerView;
private Resources mRes;
private int mBackgroundSize;
private int mCornerRadius;
private Path mBackgroundPath = new Path();
private RectF mBackgroundRect = new RectF();
private Paint mBackgroundPaint;
private Rect mInvalidateRect = new Rect();
private Rect mTmpRect = new Rect();
// The absolute bounds of the fast scroller bg
private Rect mBgBounds = new Rect();
private String mSectionName;
private Paint mTextPaint;
private Rect mTextBounds = new Rect();
private float mAlpha = 1;
private ObjectAnimator mAlphaAnimator;
private boolean mVisible;
public FastScrollPopup(Resources resources, FastScrollRecyclerView recyclerView) {
mRes = resources;
mRecyclerView = recyclerView;
mBackgroundPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mTextPaint.setAlpha(0);
setTextSize(DensityUtil.dip2sp(recyclerView.getContext(),56));
setBackgroundSize(DensityUtil.dip2px(recyclerView.getContext(),88));
}
public void setBgColor(int color) {
mBackgroundPaint.setColor(color);
mRecyclerView.invalidate(mBgBounds);
}
public void setTextColor(int color) {
mTextPaint.setColor(color);
mRecyclerView.invalidate(mBgBounds);
}
public void setTextSize(int size) {
mTextPaint.setTextSize(size);
mRecyclerView.invalidate(mBgBounds);
}
public void setBackgroundSize(int size) {
mBackgroundSize = size;
mCornerRadius = mBackgroundSize / 2;
mRecyclerView.invalidate(mBgBounds);
}
public void setTypeface(Typeface typeface) {
mTextPaint.setTypeface(typeface);
mRecyclerView.invalidate(mBgBounds);
}
/**
* Animates the visibility of the fast scroller popup.
*/
public void animateVisibility(boolean visible) {
if (mVisible != visible) {
mVisible = visible;
if (mAlphaAnimator != null) {
mAlphaAnimator.cancel();
}
mAlphaAnimator = ObjectAnimator.ofFloat(this, "alpha", visible ? 1f : 0f);
mAlphaAnimator.setDuration(visible ? 200 : 150);
mAlphaAnimator.start();
}
}
// Setter/getter for the popup alpha for animations
public void setAlpha(float alpha) {
mAlpha = alpha;
mRecyclerView.invalidate(mBgBounds);
}
public float getAlpha() {
return mAlpha;
}
public void draw(Canvas canvas) {
if (isVisible()) {
// Draw the fast scroller popup
int restoreCount = canvas.save(Canvas.MATRIX_SAVE_FLAG);
canvas.translate(mBgBounds.left, mBgBounds.top);
mTmpRect.set(mBgBounds);
mTmpRect.offsetTo(0, 0);
mBackgroundPath.reset();
mBackgroundRect.set(mTmpRect);
float[] radii;
if (ListenerUtil.isRtl(mRes)) {
radii = new float[]{mCornerRadius, mCornerRadius, mCornerRadius, mCornerRadius, mCornerRadius, mCornerRadius, 0, 0};
} else {
radii = new float[]{mCornerRadius, mCornerRadius, mCornerRadius, mCornerRadius, 0, 0, mCornerRadius, mCornerRadius};
}
mBackgroundPath.addRoundRect(mBackgroundRect, radii, Path.Direction.CW);
mBackgroundPaint.setAlpha((int) (mAlpha * 255));
mTextPaint.setAlpha((int) (mAlpha * 255));
canvas.drawPath(mBackgroundPath, mBackgroundPaint);
canvas.drawText(mSectionName, (mBgBounds.width() - mTextBounds.width()) / 2,
mBgBounds.height() - (mBgBounds.height() - mTextBounds.height()) / 2,
mTextPaint);
canvas.restoreToCount(restoreCount);
}
}
public void setSectionName(String sectionName) {
if (!sectionName.equals(mSectionName)) {
mSectionName = sectionName;
mTextPaint.getTextBounds(sectionName, 0, sectionName.length(), mTextBounds);
// Update the width to use measureText since that is more accurate
mTextBounds.right = (int) (mTextBounds.left + mTextPaint.measureText(sectionName));
}
}
/**
* Updates the bounds for the fast scroller.
*
* @return the invalidation rect for this update.
*/
public Rect updateFastScrollerBounds(FastScrollRecyclerView recyclerView, int thumbOffsetY) {
mInvalidateRect.set(mBgBounds);
if (isVisible()) {
// Calculate the dimensions and position of the fast scroller popup
int edgePadding = recyclerView.getScrollBarWidth();
int bgPadding = (mBackgroundSize - mTextBounds.height()) / 2;
int bgHeight = mBackgroundSize;
int bgWidth = Math.max(mBackgroundSize, mTextBounds.width() + (2 * bgPadding));
if (ListenerUtil.isRtl(mRes)) {
mBgBounds.left = (2 * recyclerView.getScrollBarWidth());
mBgBounds.right = mBgBounds.left + bgWidth;
} else {
mBgBounds.right = recyclerView.getWidth() - (2 * recyclerView.getScrollBarWidth());
mBgBounds.left = mBgBounds.right - bgWidth;
}
mBgBounds.top = thumbOffsetY - bgHeight + recyclerView.getScrollBarThumbHeight() / 2;
mBgBounds.top = Math.max(edgePadding, Math.min(mBgBounds.top, recyclerView.getHeight() - edgePadding - bgHeight));
mBgBounds.bottom = mBgBounds.top + bgHeight;
} else {
mBgBounds.setEmpty();
}
// Combine the old and new fast scroller bounds to create the full invalidate rect
mInvalidateRect.union(mBgBounds);
return mInvalidateRect;
}
private boolean isVisible() {
return (mAlpha > 0f) && (!TextUtils.isEmpty(mSectionName));
}
}