# Modal Transition

You can bind a full-screen modal to a component through the **bindContentCover** attribute. Better yet, with the **ModalTransition** parameter, you can apply a transition effect for when the component is inserted or deleted.

>  **NOTE**
>
>  The APIs of this module are supported since API version 10. Updates will be marked with a superscript to indicate their earliest API version.
>
>  Switching between landscape and portrait modes is not supported.
>
>  Route hopping is not supported.

## bindContentCover

bindContentCover(isShow: boolean, builder: CustomBuilder, options?: ContentCoverOptions)

Binds a modal to the component, which can be displayed when the component is touched. The content of the modal is customizable. The transition type can be set to none, slide-up and slide-down animation, and opacity gradient animation.

**System capability**: SystemCapability.ArkUI.ArkUI.Full

**Parameters**

| Name | Type                                       | Mandatory| Description                                                        |
| ------- | ------------------------------------------- | ---- | ------------------------------------------------------------ |
| isShow  | boolean                                     | Yes  | Whether to display the modal.<br>Since API version 10, this parameter supports two-way binding through [$$](../../quick-start/arkts-two-way-sync.md).|
| builder | [CustomBuilder](ts-types.md#custombuilder8) | Yes  | Content of the modal.                                      |
| options | [ContentCoverOptions](#contentcoveroptions) | No  | Optional attributes of the modal.                                |

## ContentCoverOptions
Inherited from [BindOptions](ts-universal-attributes-sheet-transition.md#bindoptions).
| Name             | Type                                      | Mandatory  | Description           |
| --------------- | ---------------------------------------- | ---- | ------------- |
| modalTransition | [ModalTransition](ts-types.md#modaltransition10) | No   | Transition mode of the modal. |

## Example

### Example 1

This example applies a custom animation to two modals whose transition type is none.

```ts
// xxx.ets
@Entry
@Component
struct ModalTransitionExample {
  @State isShow:boolean = false
  @State isShow2:boolean = false

  @Builder myBuilder2() {
    Column() {
      Button("close modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = false;
        })
    }
    .width('100%')
    .height('100%')
  }

  @Builder myBuilder() {
    Column() {
      Button("transition modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = true;
        }).bindContentCover(this.isShow2, this.myBuilder2(), {modalTransition: ModalTransition.NONE, backgroundColor: Color.Orange, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})

      Button("close modal 1")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow = false;
        })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }

  build() {
    Column() {
      Button("transition modal 1")
        .onClick(() => {
          this.isShow = true
        })
        .fontSize(20)
        .margin(10)
        .bindContentCover(this.isShow, this.myBuilder(), {modalTransition: ModalTransition.NONE, backgroundColor: Color.Pink, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})
    }
    .justifyContent(FlexAlign.Center)
    .backgroundColor("#ff49c8ab")
    .width('100%')
    .height('100%')
  }
}
```

![en-us_full_screen_modal_none_1](figures/en-us_full_screen_modal_none_1.gif)

### Example 2

This example applies a custom animation to two modals whose transition type is none.

```ts
// xxx.ets
import curves from '@ohos.curves';
@Entry
@Component
struct ModalTransitionExample {
  @State  @Watch("isShow1Change") isShow:boolean = false
  @State  @Watch("isShow2Change") isShow2:boolean = false
  @State isScale1:number = 1;
  @State isScale2:number = 1;

  isShow1Change() {
    this.isShow ? this.isScale1 = 0.95 : this.isScale1 = 1
  }
  isShow2Change() {
    this.isShow2 ? this.isScale2 = 0.95 : this.isScale2 = 1
  }
  @Builder myBuilder2() {
    Column() {
      Button("close modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = false;
        })
    }
    .width('100%')
    .height('100%')
  }


  @Builder myBuilder() {
    Column() {
      Button("transition modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = true;
        }).bindContentCover(this.isShow2, this.myBuilder2(), {modalTransition: ModalTransition.NONE, backgroundColor: Color.Orange, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})

      Button("close modal 1")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow = false;
        })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
    .scale({x: this.isScale2, y: this.isScale2})
    .animation({curve:curves.springMotion()})
  }

  build() {
    Column() {
      Button("transition modal 1")
        .onClick(() => {
          this.isShow = true
        })
        .fontSize(20)
        .margin(10)
        .bindContentCover(this.isShow, this.myBuilder(), {modalTransition: ModalTransition.NONE, backgroundColor: Color.Pink, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})
    }
    .justifyContent(FlexAlign.Center)
    .backgroundColor("#ff49c8ab")
    .width('100%')
    .height('100%')
    .scale({ x: this.isScale1, y: this.isScale1 })
    .animation({ curve: curves.springMotion() })
  }
}
```

![en-us_full_screen_modal_none_2](figures/en-us_full_screen_modal_none_2.gif)

### Example 3

This example shows two modals whose transition type is slide-up and slide-down animation.

```ts
// xxx.ets
@Entry
@Component
struct ModalTransitionExample {
  @State isShow:boolean = false
  @State isShow2:boolean = false

  @Builder myBuilder2() {
    Column() {
      Button("close modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = false;
        })
    }
    .width('100%')
    .height('100%')
  }

  @Builder myBuilder() {
    Column() {
      Button("transition modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = true;
        }).bindContentCover(this.isShow2, this.myBuilder2(), {modalTransition: ModalTransition.DEFAULT, backgroundColor: Color.Gray, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})

      Button("close modal 1")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow = false;
        })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }

  build() {
    Column() {
      Button("transition modal 1")
        .onClick(() => {
          this.isShow = true
        })
        .fontSize(20)
        .margin(10)
        .bindContentCover(this.isShow, this.myBuilder(), {modalTransition: ModalTransition.DEFAULT, backgroundColor: Color.Pink, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})
    }
    .justifyContent(FlexAlign.Center)
    .backgroundColor(Color.White)
    .width('100%')
    .height('100%')
  }
}
```

![en-us_full_screen_modal_default](figures/en-us_full_screen_modal_default.gif)

### Example 4

This example shows two modals whose transition type is opacity gradient animation.

```ts
// xxx.ets
@Entry
@Component
struct ModalTransitionExample {
  @State isShow:boolean = false
  @State isShow2:boolean = false

  @Builder myBuilder2() {
    Column() {
      Button("close modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = false;
        })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }


  @Builder myBuilder() {
    Column() {
      Button("transition modal 2")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow2 = true;
        }).bindContentCover(this.isShow2, this.myBuilder2(), {modalTransition: ModalTransition.ALPHA, backgroundColor: Color.Gray, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})

      Button("close modal 1")
        .margin(10)
        .fontSize(20)
        .onClick(()=>{
          this.isShow = false;
        })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }

  build() {
    Column() {
      Button("transition modal 1")
        .onClick(() => {
          this.isShow = true
        })
        .fontSize(20)
        .margin(10)
        .bindContentCover(this.isShow, this.myBuilder(), {modalTransition: ModalTransition.ALPHA, backgroundColor: Color.Pink, onAppear: () => {console.log("BindContentCover onAppear.")}, onDisappear: () => {console.log("BindContentCover onDisappear.")}})
    }
    .justifyContent(FlexAlign.Center)
    .backgroundColor(Color.White)
    .width('100%')
    .height('100%')
  }
}
```

![en-us_full_screen_modal_alpha](figures/en-us_full_screen_modal_alpha.gif)