共计 9282 个字符,预计需要花费 24 分钟才能阅读完成。
一. 组件动画
在组件上创立和运行动画的快捷方式。具体用法请参考通用办法。
获取动画对象
通过调用 animate 办法取得 animation 对象,animation 对象反对动画属性、动画办法和动画事件。
<!-- xxx.hml -->
<div class="container">
<div id="content" class="box" onclick="Show"></div>
</div>
/* xxx.css */
.container {
flex-direction: column;
justify-content: center;
align-items: center;
width: 100%;
}
.box{
width: 200px;
height: 200px;
background-color: #ff0000;
margin-top: 30px;
}
/* xxx.js */
export default {
data: {animation: '',},
onInit() {},
onShow() {
var options = {duration: 1500,};
var frames = [
{width:200,height:200,},
{width:300,height:300,}
];
this.animation = this.$element('content').animate(frames, options); // 获取动画对象
},
Show() {this.animation.play();
}
}
阐明
● 应用 animate 办法时必须传入 Keyframes 和 Options 参数。
● 屡次调用 animate 办法时,采纳 replace 策略,即最初一次调用时传入的参数失效。
设置动画参数
在获取动画对象后,通过设置参数 Keyframes 设置动画在组件上的款式。
<!-- xxx.hml -->
<div class="container">
<div id="content" class="box" onclick="Show"></div>
</div>
/* xxx.css */
.container {
flex-direction: column;
justify-content: center;
align-items: center;
width: 100%;
height: 100%;
}
.box{
width: 200px;
height: 200px;
background-color: #ff0000;
margin-top: 30px;
}
/* xxx.js */
export default {
data: {
animation: '',
keyframes:{},
options:{}},
onInit() {
this.options = {duration: 4000,}
this.keyframes = [
{
transform: {
translate: '-120px -0px',
scale: 1,
rotate: 0
},
transformOrigin: '100px 100px',
offset: 0.0,
width: 200,
height: 200
},
{
transform: {
translate: '120px 0px',
scale: 1.5,
rotate: 90
},
transformOrigin: '100px 100px',
offset: 1.0,
width: 300,
height: 300
}
]
},
Show() {this.animation = this.$element('content').animate(this.keyframes, this.options)
this.animation.play()}
}
阐明
● translate、scale 和 rtotate 的先后顺序会影响动画成果。
● transformOrigin 只对 scale 和 rtotate 起作用。
在获取动画对象后,通过设置参数 Options 来设置动画的属性。
<!-- xxx.hml -->
<div class="container">
<div id="content" class="box" onclick="Show"></div>
</div>
/* xxx.css */
.container {
flex-direction: column;
justify-content: center;
align-items: center;
width: 100%;
}
.box{
width: 200px;
height: 200px;
background-color: #ff0000;
margin-top: 30px;
}
/* xxx.js */
export default {
data: {animation: '',},
onInit() {},
onShow() {
var options = {
duration: 1500,
easing: 'ease-in',
delay: 5,
iterations: 2,
direction: 'normal',
};
var frames = [
{
transform: {translate: '-150px -0px'}
},
{
transform: {translate: '150px 0px'}
}
];
this.animation = this.$element('content').animate(frames, options);
},
Show() {this.animation.play();
}
}
阐明
direction:指定动画的播放模式。
normal:动画正向循环播放。
reverse:动画反向循环播放。
alternate:动画交替循环播放,奇数次正向播放,偶数次反向播放。
alternate-reverse:动画反向交替循环播放,奇数次反向播放,偶数次正向播放。
二. 插值器动画
动画动效
通过设置插值器来实现动画成果。(从 API Version 6 开始反对。)
创立动画对象
通过 createAnimator 创立一个动画对象,通过设置参数 options 来设置动画的属性。
<!-- xxx.hml -->
<div class="container">
<div style="width: 300px;height: 300px;margin-top: 100px;background: linear-gradient(pink, purple);transform: translate({{translateVal}});">
</div>
<div class="row">
<button type="capsule" value="play" onclick="playAnimation"></button>
</div>
</div>
/* xxx.css */
.container {
width:100%;
height:100%;
flex-direction: column;
align-items: center;
justify-content: center;
}
button{width: 200px;}
.row{
width: 65%;
height: 100px;
align-items: center;
justify-content: space-between;
margin-top: 50px;
margin-left: 260px;
}
// xxx.js
import animator from '@ohos.animator';
export default {
data: {
translateVal: 0,
animation: null
},
onInit() {},
onShow(){
var options = {
duration: 3000,
easing:"friction",
delay:"1000",
fill: 'forwards',
direction:'alternate',
iterations: 2,
begin: 0,
end: 180
};// 设置参数
this.animation = animator.createAnimator(options)// 创立动画
},
playAnimation() {
var _this = this;
this.animation.onframe = function(value) {_this.translateVal= value};
this.animation.play();}
}
阐明
● 应用 createAnimator 创立动画对象时必须传入 options 参数。
● begin 插值终点,不设置时默认为 0。
● end 插值起点,不设置时默认为 1。
增加动画事件和调用接口
animator 反对事件和接口,能够通过增加 frame、cancel、repeat、finish 事件和调用 update、play、pause、cancel、reverse、finish 接口自定义动画成果。animator 反对的事件和接口具体见动画中的 createAnimator。
<!-- xxx.hml -->
<div style="flex-direction: column;align-items: center;width: 100%;height: 100%;">
<div style="width:200px;height: 200px;margin-top: 100px;background: linear-gradient(#b30d29, #dcac1b);
transform: scale({{scaleVal}});"></div>
<div style="width: {{DivWidth}};height: {{DivHeight}};margin-top: 200px;
background: linear-gradient(pink, purple);margin-top: 200px;transform:translateY({{translateVal}});">
</div>
<div class="row">
<button type="capsule" value="play" onclick="playAnimation"></button>
<button type="capsule" value="update" onclick="updateAnimation"></button>
</div>
<div class="row1">
<button type="capsule" value="pause" onclick="pauseAnimation"></button>
<button type="capsule" value="finish" onclick="finishAnimation"></button>
</div>
<div class="row2">
<button type="capsule" value="cancel" onclick="cancelAnimation"></button>
<button type="capsule" value="reverse" onclick="reverseAnimation"></button>
</div>
</div>
/* xxx.css */
button{width: 200px;}
.row{
width: 65%;
height: 100px;
align-items: center;
justify-content: space-between;
margin-top: 150px;
position: fixed;
top: 52%;
left: 120px;
}
.row1{
width: 65%;
height: 100px;
align-items: center;
justify-content: space-between;
margin-top: 120px;
position: fixed;
top: 65%;
left: 120px;
}
.row2{
width: 65%;
height: 100px;
align-items: center;
justify-content: space-between;
margin-top: 100px;
position: fixed;
top: 75%;
left: 120px;
}
// xxx.js
import animator from '@ohos.animator';
import promptAction from '@ohos.promptAction';
export default {
data: {
scaleVal:1,
DivWidth:200,
DivHeight:200,
translateVal:0,
animation: null
},
onInit() {
var options = {
duration: 3000,
fill: 'forwards',
begin: 200,
end: 270
};
this.animation = animator.createAnimator(options);
},
onShow() {
var _this= this;
// 增加动画重放事件
this.animation.onrepeat = function() {
promptAction.showToast({message: 'repeat'});
var repeatoptions = {
duration: 2000,
iterations: 1,
direction: 'alternate',
begin: 180,
end: 240
};
_this.animation.update(repeatoptions);
_this.animation.play();};
},
playAnimation() {
var _this= this;
// 增加动画逐帧插值回调事件
this.animation.onframe = function(value) {
_this. scaleVal= value/150,
_this.DivWidth = value,
_this.DivHeight = value,
_this.translateVal = value-180
};
this.animation.play();},
updateAnimation() {
var newoptions = {
duration: 5000,
iterations: 2,
begin: 120,
end: 180
};
this.animation.update(newoptions);
this.animation.play();// 调用动画播放接口},
pauseAnimation() {this.animation.pause();// 调用动画暂停接口
},
finishAnimation() {
var _this= this;
// 增加动画实现事件
this.animation.onfinish = function() {
promptAction.showToast({message: 'finish'})
};
this.animation.finish(); // 调用动画实现接口},
cancelAnimation() {this.animation.cancel(); // 调用动画勾销接口
},
reverseAnimation() {this.animation.reverse(); // 调用动画倒放接口
}
}
阐明
在调用 update 接口的过程中能够应用这个接口更新动画参数,入参加 createAnimator 统一。
动画帧
申请动画帧
申请动画帧时通过 requestAnimationFrame 函数逐帧回调,在调用该函数时传入一个回调函数。
runframe 在调用 requestAnimationFrame 时传入带有 timestamp 参数的回调函数 step,将 step 中的 timestamp 赋予起始的 startTime。当 timestamp 与 startTime 的差值小于规定的工夫时将再次调用 requestAnimationFrame,最终动画将会进行。
<!-- xxx.hml -->
<div class="container">
<tabs onchange="changecontent">
<tab-content>
<div class="container">
<stack style="width: 300px;height: 300px;margin-top: 100px;margin-bottom: 100px;">
<canvas id="mycanvas" style="width: 100%;height: 100%;background-color: coral;">
</canvas>
<div style="width: 50px;height: 50px;border-radius: 25px;background-color: indigo;position: absolute;left: {{left}};top: {{top}};">
</div>
</stack>
<button type="capsule" value="play" onclick="runframe"></button>
</div>
</tab-content>
</tabs>
</div>
/* xxx.css */
.container {
flex-direction: column;
justify-content: center;
align-items: center;
width: 100%;
height: 100%;
}
button{width: 300px;}
// xxx.js
export default {
data: {
timer: null,
left: 0,
top: 0,
flag: true,
animation: null,
startTime: 0,
},
onShow() {var test = this.$element("mycanvas");
var ctx = test.getContext("2d");
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(300, 300);
ctx.lineWidth = 5;
ctx.strokeStyle = "red";
ctx.stroke();},
runframe() {
this.left = 0;
this.top = 0;
this.flag = true;
this.animation = requestAnimationFrame(this.step);
},
step(timestamp) {if (this.flag) {
this.left += 5;
this.top += 5;
if (this.startTime == 0) {this.startTime = timestamp;}
var elapsed = timestamp - this.startTime;
if (elapsed < 500) {console.log('callback step timestamp:' + timestamp);
this.animation = requestAnimationFrame(this.step);
}
} else {
this.left -= 5;
this.top -= 5;
this.animation = requestAnimationFrame(this.step);
}
if (this.left == 250 || this.left == 0) {this.flag = !this.flag}
},
onDestroy() {cancelAnimationFrame(this.animation);
}
}
阐明
requestAnimationFrame 函数在调用回调函数时在第一个参数地位传入 timestamp 工夫戳,示意 requestAnimationFrame 开始去执行回调函数的时刻。
勾销动画帧
通过 cancelAnimationFrame 函数勾销逐帧回调,在调用 cancelAnimationFrame 函数时勾销 requestAnimationFrame 函数的申请。
<!-- xxx.hml -->
<div class="container">
<tabs onchange="changecontent">
<tab-content>
<div class="container">
<stack style="width: 300px;height: 300px;margin-top: 100px;margin-bottom: 100px;">
<canvas id="mycanvas" style="width: 100%;height: 100%;background-color: coral;">
</canvas>
<div style="width: 50px;height: 50px;border-radius: 25px;background-color: indigo;position: absolute;left: {{left}};top: {{top}};">
</div>
</stack>
<button type="capsule" value="play" onclick="runframe"></button>
</div>
</tab-content>
</tabs>
</div>
/* xxx.css */
.container {
flex-direction: column;
justify-content: center;
align-items: center;
width: 100%;
height: 100%;
}
button{width: 300px;}
// xxx.js
export default {
data: {
timer: null,
left: 0,
top: 0,
flag: true,
animation: null
},
onShow() {var test = this.$element("mycanvas");
var ctx = test.getContext("2d");
ctx.beginPath();
ctx.moveTo(0, 0);
ctx.lineTo(300, 300);
ctx.lineWidth = 5;
ctx.strokeStyle = "red";
ctx.stroke();},
runframe() {
this.left = 0;
this.top = 0;
this.flag = true;
this.animation = requestAnimationFrame(this.step);
},
step(timestamp) {if (this.flag) {
this.left += 5;
this.top += 5;
this.animation = requestAnimationFrame(this.step);
} else {
this.left -= 5;
this.top -= 5;
this.animation = requestAnimationFrame(this.step);
}
if (this.left == 250 || this.left == 0) {this.flag = !this.flag}
},
onDestroy() {cancelAnimationFrame(this.animation);
}
}
阐明
在调用该函数时需传入一个具备标识 id 的参数。