diff --git a/src/swipe-item/index.js b/src/swipe-item/index.js
index d0e7ba973..6e01fed0e 100644
--- a/src/swipe-item/index.js
+++ b/src/swipe-item/index.js
@@ -9,19 +9,22 @@ export default createComponent({
data() {
return {
offset: 0,
+ mounted: false,
};
},
+ mounted() {
+ this.$nextTick(() => {
+ this.mounted = true;
+ });
+ },
+
computed: {
style() {
const style = {};
- const { vertical, computedWidth, computedHeight } = this.parent;
+ const { size, vertical } = this.parent;
- if (vertical) {
- style.height = `${computedHeight}px`;
- } else {
- style.width = `${computedWidth}px`;
- }
+ style[vertical ? 'height' : 'width'] = `${size}px`;
if (this.offset) {
style.transform = `translate${vertical ? 'Y' : 'X'}(${this.offset}px)`;
@@ -29,12 +32,32 @@ export default createComponent({
return style;
},
+
+ shouldRender() {
+ const { index, parent, mounted } = this;
+
+ if (!parent.lazyRender) {
+ return true;
+ }
+
+ // wait for all item to mount, so we can get the exact count
+ if (!mounted) {
+ return false;
+ }
+
+ const active = parent.activeIndicator;
+ const maxActive = parent.count - 1;
+ const prevActive = active === 0 ? maxActive : active - 1;
+ const nextActive = active === maxActive ? 0 : active + 1;
+
+ return index === active || index === prevActive || index === nextActive;
+ },
},
render() {
return (
- {this.slots()}
+ {this.shouldRender && this.slots()}
);
},
diff --git a/src/swipe-item/index.less b/src/swipe-item/index.less
index 0fdb679e8..3755c3296 100644
--- a/src/swipe-item/index.less
+++ b/src/swipe-item/index.less
@@ -1,6 +1,7 @@
@import '../style/var';
.van-swipe-item {
+ position: relative;
flex-shrink: 0;
width: 100%;
height: 100%;
diff --git a/src/swipe/README.md b/src/swipe/README.md
index 2084f2d7a..1785f78cc 100644
--- a/src/swipe/README.md
+++ b/src/swipe/README.md
@@ -128,20 +128,14 @@ export default {
```
@@ -176,6 +170,7 @@ export default {
| vertical | Whether to be vertical Scrolling | *boolean* | `false` |
| touchable | Whether to allow swipe by touch gesture | *boolean* | `true` |
| stop-propagation `v2.1.0` | Whether to stop touchmove event propagation | *boolean* | `false` |
+| lazy-render `v2.6.0` | Whether to enable lazy render | *boolean* | `false` |
| indicator-color | Indicator color | *string* | `#1989fa` |
### Swipe Events
diff --git a/src/swipe/README.zh-CN.md b/src/swipe/README.zh-CN.md
index 3a7d3d5f0..a933f516c 100644
--- a/src/swipe/README.zh-CN.md
+++ b/src/swipe/README.zh-CN.md
@@ -134,20 +134,14 @@ export default {
```
@@ -182,6 +176,7 @@ export default {
| vertical | 是否为纵向滚动 | *boolean* | `false` |
| touchable | 是否可以通过手势滑动 | *boolean* | `true` |
| stop-propagation `v2.2.13` | 是否阻止滑动事件冒泡 | *boolean* | `true` |
+| lazy-render `v2.6.0` | 是否延迟渲染未展示的轮播 | *boolean* | `false` |
| indicator-color | 指示器颜色 | *string* | `#1989fa` |
### Swipe Events
diff --git a/src/swipe/index.js b/src/swipe/index.js
index d754e4a58..6a8cc2847 100644
--- a/src/swipe/index.js
+++ b/src/swipe/index.js
@@ -33,6 +33,7 @@ export default createComponent({
height: [Number, String],
autoplay: [Number, String],
vertical: Boolean,
+ lazyRender: Boolean,
indicatorColor: String,
loop: {
type: Boolean,
@@ -62,13 +63,13 @@ export default createComponent({
data() {
return {
- computedWidth: 0,
- computedHeight: 0,
offset: 0,
active: 0,
deltaX: 0,
deltaY: 0,
swiping: false,
+ computedWidth: 0,
+ computedHeight: 0,
};
},
diff --git a/src/swipe/test/index.spec.js b/src/swipe/test/index.spec.js
index 2fe219e33..acb40688f 100644
--- a/src/swipe/test/index.spec.js
+++ b/src/swipe/test/index.spec.js
@@ -171,3 +171,47 @@ test('should pause auto play when page hidden', async () => {
expect(change).toHaveBeenCalledTimes(0);
});
+
+test('lazy-render prop', async () => {
+ const wrapper = mount({
+ template: `
+
+ 1
+ 2
+ 3
+ 4
+
+ `,
+ data() {
+ return {
+ active: 0,
+ };
+ },
+ });
+
+ await later();
+ const items = wrapper.findAll('.van-swipe-item');
+
+ expect(items.at(0).contains('span')).toBeTruthy();
+ expect(items.at(1).contains('span')).toBeTruthy();
+ expect(items.at(2).contains('span')).toBeFalsy();
+ expect(items.at(3).contains('span')).toBeTruthy();
+
+ wrapper.setData({ active: 1 });
+ expect(items.at(0).contains('span')).toBeTruthy();
+ expect(items.at(1).contains('span')).toBeTruthy();
+ expect(items.at(2).contains('span')).toBeTruthy();
+ expect(items.at(3).contains('span')).toBeFalsy();
+
+ wrapper.setData({ active: 2 });
+ expect(items.at(0).contains('span')).toBeFalsy();
+ expect(items.at(1).contains('span')).toBeTruthy();
+ expect(items.at(2).contains('span')).toBeTruthy();
+ expect(items.at(3).contains('span')).toBeTruthy();
+
+ wrapper.setData({ active: 3 });
+ expect(items.at(0).contains('span')).toBeTruthy();
+ expect(items.at(1).contains('span')).toBeFalsy();
+ expect(items.at(2).contains('span')).toBeTruthy();
+ expect(items.at(3).contains('span')).toBeTruthy();
+});