133 lines
4.5 KiB
Plaintext
133 lines
4.5 KiB
Plaintext
/*
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* Copyright (C) 2024 Huawei Device Co., Ltd.
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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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import { ImageKnifeComponent, ImageKnifeOption } from '@ohos/libraryimageknife'
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@Entry
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@Component
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struct testImageKnifeNetPlaceholder {
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@State imageKnifeOption: ImageKnifeOption =
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{
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loadSrc: $r('app.media.icon'),
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placeholderSrc: $r('app.media.icon_loading'),
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errorholderSrc: $r('app.media.icon_failed'),
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};
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@State imageKnifeOption1: ImageKnifeOption =
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{
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loadSrc: $r('app.media.icon'),
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placeholderSrc: $r('app.media.icon_loading'),
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errorholderSrc: $r('app.media.icon_failed'),
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};
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@State imageKnifeOption2: ImageKnifeOption =
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{
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loadSrc: $r('app.media.icon'),
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placeholderSrc: $r('app.media.icon_loading'),
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errorholderSrc: $r('app.media.icon_failed'),
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};
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build() {
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Scroll() {
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Column() {
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Text('string类型占位图支持内存和磁盘读取').fontSize(30);
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Text('验证磁盘有无图片可以先主图缓存一张图片，再退出应用').fontSize(15);
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Text('仅第一次打开应用加载主图可以看到效果，因主图第二次加载速度很快').fontSize(15);
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Row() {
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Button('缓存一张图片作为占位图 图一')
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.onClick(() => {
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this.imageKnifeOption =
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{
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loadSrc: 'https://img-blog.csdn.net/20140514114029140',
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placeholderSrc: $r('app.media.icon_loading'),
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errorholderSrc: $r('app.media.icon_failed'),
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}
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})
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}
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Text('当图一没有展示，会从磁盘中拿占位图').fontSize(15);
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Text('当图一展示时，会从内存中拿占位图，不会走磁盘逻辑').fontSize(15);
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Text('下图展示的为后备回调符的图片').fontSize(15);
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ImageKnifeComponent({ imageKnifeOption: {loadSrc:$r('app.media.mask_starfish')} })
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.width(200)
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.height(200)
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.backgroundColor(Color.Orange)
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Text('下图展示的主图为图二string类型的占位图').fontSize(15);
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Text('图一:').fontSize(20);
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ImageKnifeComponent({ imageKnifeOption: this.imageKnifeOption })
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.width(200)
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.height(200)
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.backgroundColor(Color.Orange)
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Row() {
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Button('展示已缓存的占位图')
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.onClick(() => {
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this.imageKnifeOption1 =
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{
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loadSrc : $r('app.media.pngSample'),
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placeholderSrc: 'https://img-blog.csdn.net/20140514114029140',
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fallbackSrc: $r('app.media.mask_starfish'),
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errorholderSrc: $r('app.media.icon_failed'),
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}
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})
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Button('当占位图未缓存时展示后备回调符')
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.onClick(() => {
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this.imageKnifeOption2 =
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{
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loadSrc : $r('app.media.gifSample'),
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placeholderSrc: 'https://img0.baidu.com/it/u=2794536113,2700219306&fm=253&fmt=auto&app=120&f=JPEG?w=500&h=500',
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fallbackSrc: $r('app.media.mask_starfish'),
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errorholderSrc: $r('app.media.icon_failed'),
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}
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})
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}
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Text('展示已缓存的占位图，如图一未加载过则会显示后备回调符').fontSize(15);
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Text('图二:').fontSize(20);
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ImageKnifeComponent({ imageKnifeOption: this.imageKnifeOption1 })
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.width(200)
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.height(200)
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.backgroundColor(Color.Orange)
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Text('占位图未缓存展示后备回调符，如图三').fontSize(15);
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Text('图三:').fontSize(20);
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ImageKnifeComponent({ imageKnifeOption: this.imageKnifeOption2 })
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.width(200)
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.height(200)
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.backgroundColor(Color.Orange)
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}
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.alignItems(HorizontalAlign.Center)
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.width('100%')
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}
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.width('100%')
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.height('100%')
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}
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aboutToAppear() {
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}
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aboutToDisappear() {
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}
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onBackPress() {
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}
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} |