mirror of
https://github.com/material-components/material-components-android.git
synced 2026-01-21 04:22:42 +08:00
850795da31
This removes duplication between the 2 implementations and automatically fixes font loading bug in CollapsingToolbarLayout & TextInputLayout. It has a side effect of changing font loading from sync to async but it shouldn't affect anyone since font loading wasn't really working in the first place. It may affect the UIs that were affected by the original bug though. To alleviate possible "font flickering" due to async loading, CollapsingTextHelper defers the TextPaint changes until the font is actually loaded. Another scenario the async loading would have an impact on is when the font is manually overwritten with CollapsingTextHelper.setTypeface() while async op is still ongoing. The result of async load would then overwrite the font back to the originally requested. This happens in TextInputLayout which overwrites its own font setting to this of its child whenever its added. This may happen before async op completes. To guard against that, any direct font setting automatically cancels the async load (cancels == ignores the result when it comes). PiperOrigin-RevId: 212328671
71 lines
2.2 KiB
Java
71 lines
2.2 KiB
Java
/*
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* Copyright (C) 2018 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.resources;
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import android.graphics.Typeface;
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import android.support.annotation.RestrictTo;
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import android.support.annotation.RestrictTo.Scope;
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import android.support.v4.content.res.ResourcesCompat.FontCallback;
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/**
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* {@link FontCallback} allowing cancelling of pending async font fetch, in case a different font is
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* set / requested in the meantime. On failed fetch, specified fallback font will be applied.
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*/
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@RestrictTo(Scope.LIBRARY_GROUP)
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public final class CancelableFontCallback extends FontCallback {
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/** Functional interface for method to call when font is retrieved (or fails with fallback). */
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public interface ApplyFont {
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void apply(Typeface font);
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}
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private final Typeface fallbackFont;
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private final ApplyFont applyFont;
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private boolean cancelled;
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public CancelableFontCallback(ApplyFont applyFont, Typeface fallbackFont) {
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this.fallbackFont = fallbackFont;
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this.applyFont = applyFont;
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}
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@Override
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public void onFontRetrieved(Typeface font) {
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updateIfNotCancelled(font);
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}
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@Override
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public void onFontRetrievalFailed(int reason) {
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updateIfNotCancelled(fallbackFont);
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}
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/**
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* Cancels this callback. No async operations will actually be interrupted as a result of this
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* method, but it will ignore any subsequent result of the fetch.
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*
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* <p>Callback cannot be resumed after canceling. New callback has to be created.
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*/
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public void cancel() {
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cancelled = true;
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}
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private void updateIfNotCancelled(Typeface updatedFont) {
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if (!cancelled) {
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applyFont.apply(updatedFont);
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}
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}
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}
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