radare/radare2-webui

import {NavigatorDirection} from '../core/NavigatorDirection';
import {InfiniteScrolling} from '../helpers/InfiniteScrolling';

/**  How many screen we want to retrieve in one round-trip with r2 */
export const defaultHeightProvisioning = 3;

export class RadareInfiniteBlock {

    constructor(heightProvisioning = defaultHeightProvisioning) {
        this.heightProvisioning = heightProvisioning
    }

    /**
     * Helper to delay drawing
     */
    getCurChunk() {
        return this.curChunk;
    }

    /**
     * Helper for dynamic callback at first drawing
     * Allows to place the scroll on current chunk.
     */
    getFirstElement() {
        return this.firstElement;
    }

    /**
     * Load the *new* initial offset from the "s" value
     */
    refreshInitialOffset() {
        r2.cmd('s', (offset) => {
            this.initialOffset = parseInt(offset, 16);
        });
    }

    /**
     * Gather data and set event to configure infinite scrolling
     */
    defineInfiniteParams(trigger) {
        var height = (this.container.getBody().offsetHeight === 0) ? 800 : this.container.getBody().offsetHeight;
        this.howManyLines = Math.floor(height / this.lineHeight * this.heightProvisioning);

        var infiniteScrolling = new InfiniteScrolling(
            this.container.getBody(),
            3, /* before, current, after */
            (typeof trigger !== 'undefined') ? trigger : 0.20 /* when there less than 1/5 visible */
        );

        infiniteScrolling.setTopEvent((pos, endCallback) => {
            this.nav.go(NavigatorDirection.BEFORE);
            this.infiniteDrawingContent(NavigatorDirection.BEFORE, pos, endCallback);
        });

        infiniteScrolling.setBottomEvent((pos, endCallback) => {
            this.nav.go(NavigatorDirection.AFTER);
            this.infiniteDrawingContent(NavigatorDirection.AFTER, pos, endCallback);
        });
    }

}