102 lines
3.7 KiB
Java
102 lines
3.7 KiB
Java
/*
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* Copyright (C) 2015 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.messaging.ui;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.util.AttributeSet;
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import android.view.View;
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import android.widget.LinearLayout;
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import com.android.messaging.R;
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import com.android.messaging.util.OsUtil;
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public class ViewPagerTabStrip extends LinearLayout {
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private int mSelectedUnderlineThickness;
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private final Paint mSelectedUnderlinePaint;
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private int mIndexForSelection;
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private float mSelectionOffset;
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public ViewPagerTabStrip(Context context) {
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this(context, null);
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}
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public ViewPagerTabStrip(Context context, AttributeSet attrs) {
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super(context, attrs);
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final Resources res = context.getResources();
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mSelectedUnderlineThickness =
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res.getDimensionPixelSize(R.dimen.pager_tab_underline_selected);
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int underlineColor = res.getColor(R.color.contact_picker_tab_underline);
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int backgroundColor = res.getColor(R.color.action_bar_background_color);
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mSelectedUnderlinePaint = new Paint();
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mSelectedUnderlinePaint.setColor(underlineColor);
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setBackgroundColor(backgroundColor);
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setWillNotDraw(false);
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}
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/**
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* Notifies this view that view pager has been scrolled. We save the tab index
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* and selection offset for interpolating the position and width of selection
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* underline.
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*/
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void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
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mIndexForSelection = position;
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mSelectionOffset = positionOffset;
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invalidate();
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}
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@Override
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protected void onDraw(Canvas canvas) {
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int childCount = getChildCount();
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// Thick colored underline below the current selection
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if (childCount > 0) {
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View selectedTitle = getChildAt(mIndexForSelection);
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int selectedLeft = selectedTitle.getLeft();
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int selectedRight = selectedTitle.getRight();
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final boolean isRtl = isRtl();
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final boolean hasNextTab = isRtl ? mIndexForSelection > 0
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: (mIndexForSelection < (getChildCount() - 1));
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if ((mSelectionOffset > 0.0f) && hasNextTab) {
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// Draw the selection partway between the tabs
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View nextTitle = getChildAt(mIndexForSelection + (isRtl ? -1 : 1));
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int nextLeft = nextTitle.getLeft();
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int nextRight = nextTitle.getRight();
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selectedLeft = (int) (mSelectionOffset * nextLeft +
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(1.0f - mSelectionOffset) * selectedLeft);
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selectedRight = (int) (mSelectionOffset * nextRight +
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(1.0f - mSelectionOffset) * selectedRight);
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}
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int height = getHeight();
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canvas.drawRect(selectedLeft, height - mSelectedUnderlineThickness,
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selectedRight, height, mSelectedUnderlinePaint);
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}
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}
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private boolean isRtl() {
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return OsUtil.isAtLeastJB_MR2() ? getLayoutDirection() == View.LAYOUT_DIRECTION_RTL : false;
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}
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} |