PageView Component Reference

The PageView component is derived from ScrollView, the difference is that when scrolls it automatically snaps to next page of content.

pageview-inspector

Click the Add Component button at the bottom of the Inspector panel and select UI/PageView to add the PageView component to the node.

To use PageView, please refer to the PageView API documentation and the PageView scene of the test-cases-3d project.

PageView Properties

Properties Function Description
AutoPageTurningThreshold Auto page turning velocity threshold. When users swipe the PageView quickly, it will calculate a velocity based on the scroll distance and time, if the calculated velocity is larger than the threshold, then it will trigger page turning
Bounce Duration The elapse time of bouncing back. The value range is 0 ~ 10, and when the value is 0, it will bounce back immediately
Brake It determines how quickly the content stop moving. A value of 1 will stop the movement immediately. A value of 0 will never stop the movement until it reaches to the boundary of page view
Content It is a node reference that is used to contain the contents of the page view
Direction The page view direction
Elastic When elastic is set, the content will be bounce back when move out of boundary
Indicator The Page View Indicator, please refer to PageViewIndicator Setting below for details
Inertia When inertia is set, the content will continue to move for a little while when touch ended
PageEvents A list of the page view's events callback
PageTurningEventTiming Change the timing for sending the PAGE_TURNING event
CancelInnerEvents If it's set to true, the scroll behavior will cancel touch events on inner content nodes. It's set to true by default
ScrollThreshold This value will be multiplied by the distance between two pages, to get the threshold distance. If user scroll distance is larger than this threshold distance, the page will turn immediately
SizeMode Specify the size type of each page in PageView, including Unified and Free

PageViewIndicator Setting

PageViewIndicator is optional, the component is used to display the number of pages and mark the current page.

The association can be done by dragging a node with a PageViewIndicator component into the Indicator property of the PageView component in the Hierarchy panel.

PageView Event

pageview-event

Properties Function Description
Target Node with script component
Component Script component name
Handler Specifies a callback function that will be called when the PageView event occurs
CustomEventData The user specifies an arbitrary string as the last parameter of the event callback

The PageView event callback has two parameters, the first parameter is the PageView itself, the second parameter is the event type of the PageView.

Detailed Explanation

The PageView component must have the specified content node to work. Each child node in content is a separate page, and the size of each page is the size of the PageView node. If the node size is larger than the content size, it may result in an incomplete scroll. Under the PageView component there is a node object, which combines with ScrollThreshold to determine whether the current sliding distance is such that the page can be turned. The operation effect is divided into two kinds:

  • Slow sliding - by dragging the page in the view to reach the specified ScrollThreshold value (the value is the percentage of page size), after the release will automatically slide to the next page.
  • Fast sliding - quickly drag in one direction, automatically slide to the next page. Only slide up to one page at a time.

Add callback via script code

Method one

The event callback added by this method is the same as the event callback added by the editor, all added by code. First you need to construct a EventHandler object, and then set the corresponding target, component, handler and customEventData parameters.

import { _decorator, Component, Event, Node, PageView, EventHandler } from 'cc';
const { ccclass, property } = _decorator;

@ccclass("example")
export class example extends Component {
    onLoad(){
        const pageChangedEventHandler = new EventHandler();
        // This Node is the node to which your event processing code component belongs
        pageChangedEventHandler.target = this.node;
        // This is the script class name
        pageChangedEventHandler.component = 'example';
        pageChangedEventHandler.handler = 'callback';
        pageChangedEventHandler.customEventData = 'foobar';

        const page = this.node.getComponent(PageView);
        page.clickEvents.push(pageChangedEventHandler);
    }

    callback(event: Event, customEventData: string){
        // The event here is a Touch Event object, and you can get the send node of the event by event.target
        const node = event.target as Node;
        const pageview = node.getComponent(PageView);
        console.log(customEventData); // foobar
    }
}

Method two

By pageView.node.on('page-turning', ...) way to add.

// Suppose we add event handling callbacks to the onLoad method of a component and perform event handling in the callback function:

import { _decorator, Component, Event, Node, PageView } from 'cc';
const { ccclass, property } = _decorator;

@ccclass("example")
export class example extends Component {
    onLoad(){
        this.pageView.node.on('page-turning', this.callback, this);
    }

    callback(pageView: PageView){
        // The parameter of the callback is the PageView component. Note that events registered this way cannot pass customEventData
    }
}

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