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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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 com.android.launcher3.views;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import com.android.launcher3.R;
import com.android.launcher3.util.Themes;
public class SlidingTabStrip extends LinearLayout {
private final Paint mSelectedIndicatorPaint;
private int mSelectedIndicatorHeight;
private int mIndicatorLeft = -1;
private int mIndicatorRight = -1;
private int mSelectedPosition = -1;
private float mSelectionOffset;
public SlidingTabStrip(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
setOrientation(HORIZONTAL);
setWillNotDraw(false);
mSelectedIndicatorPaint = new Paint();
mSelectedIndicatorPaint.setColor(Themes.getAttrColor(context, android.R.attr.colorAccent));
mSelectedIndicatorHeight = getResources()
.getDimensionPixelSize(R.dimen.all_apps_tabs_indicator_height);
}
public void updateIndicatorPosition(int position, float positionOffset) {
mSelectedPosition = position;
mSelectionOffset = positionOffset;
updateIndicatorPosition();
}
public void updateTabTextColor(int pos) {
for (int i=0; i < getChildCount(); i++) {
Button tab = (Button) getChildAt(i);
tab.setSelected(i == pos);
}
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
updateTabTextColor(0);
updateIndicatorPosition(0, 0);
}
private void updateIndicatorPosition() {
final View tab = getChildAt(mSelectedPosition);
int left, right;
if (tab != null && tab.getWidth() > 0) {
left = tab.getLeft();
right = tab.getRight();
if (mSelectionOffset > 0f && mSelectedPosition < getChildCount() - 1) {
// Draw the selection partway between the tabs
View nextTitle = getChildAt(mSelectedPosition + 1);
left = (int) (mSelectionOffset * nextTitle.getLeft() +
(1.0f - mSelectionOffset) * left);
right = (int) (mSelectionOffset * nextTitle.getRight() +
(1.0f - mSelectionOffset) * right);
}
} else {
left = right = -1;
}
setIndicatorPosition(left, right);
}
private void setIndicatorPosition(int left, int right) {
if (left != mIndicatorLeft || right != mIndicatorRight) {
mIndicatorLeft = left;
mIndicatorRight = right;
invalidate();
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawRect(mIndicatorLeft, getHeight() - mSelectedIndicatorHeight,
mIndicatorRight, getHeight(), mSelectedIndicatorPaint);
}
}
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