mirror of
https://github.com/material-components/material-components-android.git
synced 2026-01-17 02:11:43 +08:00
349 lines
12 KiB
Java
349 lines
12 KiB
Java
/*
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* Copyright (C) 2016 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.google.android.material.bottomnavigation;
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import com.google.android.material.R;
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import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
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import android.content.Context;
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import android.content.res.ColorStateList;
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import android.content.res.Resources;
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import android.graphics.drawable.Drawable;
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import android.support.annotation.NonNull;
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import android.support.annotation.Nullable;
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import android.support.annotation.RestrictTo;
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import android.support.annotation.StyleRes;
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import android.support.v4.content.ContextCompat;
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import android.support.v4.graphics.drawable.DrawableCompat;
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import android.support.v4.view.PointerIconCompat;
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import android.support.v4.view.ViewCompat;
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import android.support.v4.widget.TextViewCompat;
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import android.support.v7.view.menu.MenuItemImpl;
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import android.support.v7.view.menu.MenuView;
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import android.support.v7.widget.TooltipCompat;
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import android.text.TextUtils;
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import android.util.AttributeSet;
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import android.view.Gravity;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.widget.FrameLayout;
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import android.widget.ImageView;
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import android.widget.TextView;
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/** @hide */
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@RestrictTo(LIBRARY_GROUP)
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public class BottomNavigationItemView extends FrameLayout implements MenuView.ItemView {
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public static final int INVALID_ITEM_POSITION = -1;
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private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
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private final int defaultMargin;
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private float shiftAmount;
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private float scaleUpFactor;
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private float scaleDownFactor;
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private int labelVisibilityMode;
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private boolean isShifting;
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private ImageView icon;
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private final TextView smallLabel;
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private final TextView largeLabel;
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private int itemPosition = INVALID_ITEM_POSITION;
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private MenuItemImpl itemData;
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private ColorStateList iconTint;
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public BottomNavigationItemView(@NonNull Context context) {
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this(context, null);
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}
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public BottomNavigationItemView(@NonNull Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public BottomNavigationItemView(Context context, AttributeSet attrs, int defStyleAttr) {
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super(context, attrs, defStyleAttr);
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final Resources res = getResources();
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LayoutInflater.from(context).inflate(R.layout.design_bottom_navigation_item, this, true);
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setBackgroundResource(R.drawable.design_bottom_navigation_item_background);
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defaultMargin = res.getDimensionPixelSize(R.dimen.design_bottom_navigation_margin);
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icon = findViewById(R.id.icon);
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smallLabel = findViewById(R.id.smallLabel);
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largeLabel = findViewById(R.id.largeLabel);
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// The labels used aren't always visible, so they are unreliable for accessibility. Instead,
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// the content description of the BottomNavigationItemView should be used for accessibility.
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ViewCompat.setImportantForAccessibility(smallLabel, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO);
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ViewCompat.setImportantForAccessibility(largeLabel, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO);
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setFocusable(true);
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calculateTextScaleFactors(smallLabel.getTextSize(), largeLabel.getTextSize());
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}
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@Override
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public void initialize(MenuItemImpl itemData, int menuType) {
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this.itemData = itemData;
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setCheckable(itemData.isCheckable());
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setChecked(itemData.isChecked());
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setEnabled(itemData.isEnabled());
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setIcon(itemData.getIcon());
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setTitle(itemData.getTitle());
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setId(itemData.getItemId());
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if (!TextUtils.isEmpty(itemData.getContentDescription())) {
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setContentDescription(itemData.getContentDescription());
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}
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TooltipCompat.setTooltipText(this, itemData.getTooltipText());
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setVisibility(itemData.isVisible() ? View.VISIBLE : View.GONE);
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}
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public void setItemPosition(int position) {
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itemPosition = position;
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}
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public int getItemPosition() {
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return itemPosition;
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}
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public void setShifting(boolean shifting) {
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if (isShifting != shifting) {
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isShifting = shifting;
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boolean initialized = itemData != null;
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if (initialized) {
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setChecked(itemData.isChecked());
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}
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}
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}
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public void setLabelVisibilityMode(@LabelVisibilityMode int mode) {
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if (labelVisibilityMode != mode) {
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labelVisibilityMode = mode;
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boolean initialized = itemData != null;
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if (initialized) {
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setChecked(itemData.isChecked());
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}
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}
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}
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@Override
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public MenuItemImpl getItemData() {
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return itemData;
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}
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@Override
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public void setTitle(CharSequence title) {
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smallLabel.setText(title);
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largeLabel.setText(title);
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if (itemData == null || TextUtils.isEmpty(itemData.getContentDescription())) {
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setContentDescription(title);
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}
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}
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@Override
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public void setCheckable(boolean checkable) {
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refreshDrawableState();
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}
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@Override
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public void setChecked(boolean checked) {
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largeLabel.setPivotX(largeLabel.getWidth() / 2);
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largeLabel.setPivotY(largeLabel.getBaseline());
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smallLabel.setPivotX(smallLabel.getWidth() / 2);
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smallLabel.setPivotY(smallLabel.getBaseline());
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switch (labelVisibilityMode) {
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case LabelVisibilityMode.LABEL_VISIBILITY_AUTO:
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if (isShifting) {
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if (checked) {
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setViewLayoutParams(icon, defaultMargin, Gravity.CENTER_HORIZONTAL | Gravity.TOP);
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setViewValues(largeLabel, 1f, 1f, VISIBLE);
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} else {
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setViewLayoutParams(icon, defaultMargin, Gravity.CENTER);
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setViewValues(largeLabel, 0.5f, 0.5f, INVISIBLE);
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}
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smallLabel.setVisibility(INVISIBLE);
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} else {
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if (checked) {
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setViewLayoutParams(
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icon, (int) (defaultMargin + shiftAmount), Gravity.CENTER_HORIZONTAL | Gravity.TOP);
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setViewValues(largeLabel, 1f, 1f, VISIBLE);
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setViewValues(smallLabel, scaleUpFactor, scaleUpFactor, INVISIBLE);
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} else {
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setViewLayoutParams(icon, defaultMargin, Gravity.CENTER_HORIZONTAL | Gravity.TOP);
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setViewValues(largeLabel, scaleDownFactor, scaleDownFactor, INVISIBLE);
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setViewValues(smallLabel, 1f, 1f, VISIBLE);
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}
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}
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break;
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case LabelVisibilityMode.LABEL_VISIBILITY_SELECTED:
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if (checked) {
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setViewLayoutParams(icon, defaultMargin, Gravity.CENTER_HORIZONTAL | Gravity.TOP);
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setViewValues(largeLabel, 1f, 1f, VISIBLE);
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} else {
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setViewLayoutParams(icon, defaultMargin, Gravity.CENTER);
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setViewValues(largeLabel, 0.5f, 0.5f, INVISIBLE);
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}
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smallLabel.setVisibility(INVISIBLE);
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break;
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case LabelVisibilityMode.LABEL_VISIBILITY_LABELED:
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if (checked) {
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setViewLayoutParams(
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icon, (int) (defaultMargin + shiftAmount), Gravity.CENTER_HORIZONTAL | Gravity.TOP);
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setViewValues(largeLabel, 1f, 1f, VISIBLE);
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setViewValues(smallLabel, scaleUpFactor, scaleUpFactor, INVISIBLE);
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} else {
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setViewLayoutParams(icon, defaultMargin, Gravity.CENTER_HORIZONTAL | Gravity.TOP);
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setViewValues(largeLabel, scaleDownFactor, scaleDownFactor, INVISIBLE);
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setViewValues(smallLabel, 1f, 1f, VISIBLE);
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}
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break;
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case LabelVisibilityMode.LABEL_VISIBILITY_UNLABELED:
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setViewLayoutParams(icon, defaultMargin, Gravity.CENTER);
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largeLabel.setVisibility(GONE);
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smallLabel.setVisibility(GONE);
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break;
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default:
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break;
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}
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refreshDrawableState();
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// Set the item as selected to send an AccessibilityEvent.TYPE_VIEW_SELECTED from View, so that
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// the item is read out as selected.
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setSelected(checked);
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}
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private void setViewLayoutParams(@NonNull View view, int topMargin, int gravity) {
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LayoutParams viewParams = (LayoutParams) view.getLayoutParams();
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viewParams.topMargin = topMargin;
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viewParams.gravity = gravity;
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view.setLayoutParams(viewParams);
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}
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private void setViewValues(@NonNull View view, float scaleX, float scaleY, int visibility) {
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view.setScaleX(scaleX);
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view.setScaleY(scaleY);
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view.setVisibility(visibility);
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}
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@Override
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public void setEnabled(boolean enabled) {
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super.setEnabled(enabled);
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smallLabel.setEnabled(enabled);
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largeLabel.setEnabled(enabled);
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icon.setEnabled(enabled);
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if (enabled) {
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ViewCompat.setPointerIcon(
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this, PointerIconCompat.getSystemIcon(getContext(), PointerIconCompat.TYPE_HAND));
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} else {
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ViewCompat.setPointerIcon(this, null);
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}
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}
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@Override
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public int[] onCreateDrawableState(final int extraSpace) {
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final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
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if (itemData != null && itemData.isCheckable() && itemData.isChecked()) {
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mergeDrawableStates(drawableState, CHECKED_STATE_SET);
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}
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return drawableState;
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}
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@Override
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public void setShortcut(boolean showShortcut, char shortcutKey) {}
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@Override
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public void setIcon(Drawable iconDrawable) {
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if (iconDrawable != null) {
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Drawable.ConstantState state = iconDrawable.getConstantState();
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iconDrawable =
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DrawableCompat.wrap(state == null ? iconDrawable : state.newDrawable()).mutate();
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DrawableCompat.setTintList(iconDrawable, iconTint);
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}
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this.icon.setImageDrawable(iconDrawable);
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}
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@Override
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public boolean prefersCondensedTitle() {
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return false;
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}
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@Override
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public boolean showsIcon() {
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return true;
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}
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public void setIconTintList(ColorStateList tint) {
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iconTint = tint;
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if (itemData != null) {
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// Update the icon so that the tint takes effect
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setIcon(itemData.getIcon());
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}
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}
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public void setIconSize(int iconSize) {
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LayoutParams iconParams = (LayoutParams) icon.getLayoutParams();
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iconParams.width = iconSize;
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iconParams.height = iconSize;
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icon.setLayoutParams(iconParams);
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}
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public void setTextAppearanceInactive(@StyleRes int inactiveTextAppearance) {
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TextViewCompat.setTextAppearance(smallLabel, inactiveTextAppearance);
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calculateTextScaleFactors(smallLabel.getTextSize(), largeLabel.getTextSize());
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}
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public void setTextAppearanceActive(@StyleRes int activeTextAppearance) {
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TextViewCompat.setTextAppearance(largeLabel, activeTextAppearance);
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calculateTextScaleFactors(smallLabel.getTextSize(), largeLabel.getTextSize());
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}
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public void setTextColor(@Nullable ColorStateList color) {
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if (color != null) {
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smallLabel.setTextColor(color);
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largeLabel.setTextColor(color);
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}
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}
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private void calculateTextScaleFactors(float smallLabelSize, float largeLabelSize) {
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shiftAmount = smallLabelSize - largeLabelSize;
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scaleUpFactor = 1f * largeLabelSize / smallLabelSize;
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scaleDownFactor = 1f * smallLabelSize / largeLabelSize;
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}
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public void setItemBackground(int background) {
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Drawable backgroundDrawable =
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background == 0 ? null : ContextCompat.getDrawable(getContext(), background);
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setItemBackground(backgroundDrawable);
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}
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public void setItemBackground(@Nullable Drawable background) {
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if (background != null && background.getConstantState() != null) {
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background = background.getConstantState().newDrawable().mutate();
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}
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ViewCompat.setBackground(this, background);
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}
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}
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