98 lines
2.9 KiB
Java
98 lines
2.9 KiB
Java
/*
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* Copyright (C) 2015 Hippo Seven
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hippo.widget;
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import android.content.Context;
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import android.content.res.TypedArray;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.support.annotation.NonNull;
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import android.util.AttributeSet;
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import android.widget.ScrollView;
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import com.hippo.ehviewer.R;
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public class IndicatingScrollView extends ScrollView {
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private int mIndicatorHeight;
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private final Paint mPaint = new Paint();
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private final Rect mTemp = new Rect();
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public IndicatingScrollView(Context context) {
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super(context);
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init(context, null);
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}
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public IndicatingScrollView(Context context, AttributeSet attrs) {
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super(context, attrs);
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init(context, attrs);
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}
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public IndicatingScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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init(context, attrs);
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}
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private void init(Context context, AttributeSet attrs) {
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TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Indicating);
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mIndicatorHeight = a.getDimensionPixelOffset(R.styleable.Indicating_indicatorHeight, 1);
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mPaint.setColor(a.getColor(R.styleable.Indicating_indicatorColor, Color.BLACK));
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mPaint.setStyle(Paint.Style.FILL);
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a.recycle();
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}
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private void fillTopIndicatorDrawRect() {
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mTemp.set(0, 0, getWidth(), mIndicatorHeight);
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}
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private void fillBottomIndicatorDrawRect() {
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mTemp.set(0, getHeight() - mIndicatorHeight, getWidth(), getHeight());
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}
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private boolean needShowTopIndicator() {
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return canScrollVertically(-1);
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}
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private boolean needShowBottomIndicator() {
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return canScrollVertically(1);
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}
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@Override
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public void draw(@NonNull Canvas canvas) {
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super.draw(canvas);
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final int restoreCount = canvas.save();
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canvas.translate(getScrollX(), getScrollY());
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// Draw top indicator
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if (needShowTopIndicator()) {
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fillTopIndicatorDrawRect();
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canvas.drawRect(mTemp, mPaint);
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}
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// Draw bottom indicator
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if (needShowBottomIndicator()) {
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fillBottomIndicatorDrawRect();
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canvas.drawRect(mTemp, mPaint);
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}
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canvas.restoreToCount(restoreCount);
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}
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}
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