Tony Mak
41bccc244e
To reproduce the issue: 1. Swipe to work tab 2. Tap Home 3. Swipe up to show all apps, you can see the personal tab is highlighted while the view pager is showing work apps. We cleared the state whenever onLayout is called, we should make use of mSelectedPosition. Change-Id: I621b3c9ada0eb608280fe5e4ea8715f3a341820d
107 lines
3.7 KiB
Java
107 lines
3.7 KiB
Java
/*
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* Copyright (C) 2017 The Android Open Source Project
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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.android.launcher3.views;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import android.util.AttributeSet;
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import android.view.View;
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import android.widget.Button;
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import android.widget.LinearLayout;
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import com.android.launcher3.R;
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import com.android.launcher3.util.Themes;
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public class SlidingTabStrip extends LinearLayout {
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private final Paint mSelectedIndicatorPaint;
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private int mSelectedIndicatorHeight;
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private int mIndicatorLeft = -1;
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private int mIndicatorRight = -1;
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private int mSelectedPosition = 0;
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private float mSelectionOffset;
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public SlidingTabStrip(@NonNull Context context, @Nullable AttributeSet attrs) {
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super(context, attrs);
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setOrientation(HORIZONTAL);
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setWillNotDraw(false);
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mSelectedIndicatorPaint = new Paint();
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mSelectedIndicatorPaint.setColor(Themes.getAttrColor(context, android.R.attr.colorAccent));
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mSelectedIndicatorHeight = getResources()
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.getDimensionPixelSize(R.dimen.all_apps_tabs_indicator_height);
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}
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public void updateIndicatorPosition(int position, float positionOffset) {
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mSelectedPosition = position;
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mSelectionOffset = positionOffset;
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updateIndicatorPosition();
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}
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public void updateTabTextColor(int pos) {
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for (int i=0; i < getChildCount(); i++) {
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Button tab = (Button) getChildAt(i);
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tab.setSelected(i == pos);
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}
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}
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@Override
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protected void onLayout(boolean changed, int l, int t, int r, int b) {
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super.onLayout(changed, l, t, r, b);
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updateTabTextColor(mSelectedPosition);
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updateIndicatorPosition(mSelectedPosition, 0);
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}
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private void updateIndicatorPosition() {
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final View tab = getChildAt(mSelectedPosition);
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int left, right;
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if (tab != null && tab.getWidth() > 0) {
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left = tab.getLeft();
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right = tab.getRight();
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if (mSelectionOffset > 0f && mSelectedPosition < getChildCount() - 1) {
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// Draw the selection partway between the tabs
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View nextTitle = getChildAt(mSelectedPosition + 1);
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left = (int) (mSelectionOffset * nextTitle.getLeft() +
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(1.0f - mSelectionOffset) * left);
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right = (int) (mSelectionOffset * nextTitle.getRight() +
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(1.0f - mSelectionOffset) * right);
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}
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} else {
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left = right = -1;
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}
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setIndicatorPosition(left, right);
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}
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private void setIndicatorPosition(int left, int right) {
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if (left != mIndicatorLeft || right != mIndicatorRight) {
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mIndicatorLeft = left;
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mIndicatorRight = right;
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invalidate();
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}
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}
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@Override
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protected void onDraw(Canvas canvas) {
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super.onDraw(canvas);
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canvas.drawRect(mIndicatorLeft, getHeight() - mSelectedIndicatorHeight,
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mIndicatorRight, getHeight(), mSelectedIndicatorPaint);
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}
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} |