javascript/aspectRatioOverlay.js

(function () {
    let currentWidth = null;
    let currentHeight = null;
    let arFrameTimeout = setTimeout(function () { }, 0);

    function dimensionChange(e, is_width, is_height) {

        if (is_width) {
            currentWidth = e.target.value * 1.0;
        }
        if (is_height) {
            currentHeight = e.target.value * 1.0;
        }

        let inImg2img = gradioApp().querySelector("#tab_img2img").style.display == "block";

        if (!inImg2img) {
            return;
        }

        let targetElement = null;

        let tabIndex = get_tab_index('mode_img2img');
        if (tabIndex == 0) { // img2img
            targetElement = gradioApp().querySelector('#img2img_image div[data-testid=image] img');
        } else if (tabIndex == 1) { //Sketch
            targetElement = gradioApp().querySelector('#img2img_sketch div[data-testid=image] img');
        } else if (tabIndex == 2) { // Inpaint
            targetElement = gradioApp().querySelector('#img2maskimg div[data-testid=image] img');
        } else if (tabIndex == 3) { // Inpaint sketch
            targetElement = gradioApp().querySelector('#inpaint_sketch div[data-testid=image] img');
        }

        if (targetElement) {

            let arPreviewRect = gradioApp().querySelector('#imageARPreview');
            if (!arPreviewRect) {
                arPreviewRect = document.createElement('div');
                arPreviewRect.id = "imageARPreview";
                gradioApp().appendChild(arPreviewRect);
            }

            let viewportOffset = targetElement.getBoundingClientRect();

            let viewportscale = Math.min(targetElement.clientWidth / targetElement.naturalWidth, targetElement.clientHeight / targetElement.naturalHeight);

            let scaledx = targetElement.naturalWidth * viewportscale;
            let scaledy = targetElement.naturalHeight * viewportscale;

            let clientRectTop = (viewportOffset.top + window.scrollY);
            let clientRectLeft = (viewportOffset.left + window.scrollX);
            let clientRectCentreY = clientRectTop + (targetElement.clientHeight / 2);
            let clientRectCentreX = clientRectLeft + (targetElement.clientWidth / 2);

            let arscale = Math.min(scaledx / currentWidth, scaledy / currentHeight);
            let arscaledx = currentWidth * arscale;
            let arscaledy = currentHeight * arscale;

            let arRectTop = clientRectCentreY - (arscaledy / 2);
            let arRectLeft = clientRectCentreX - (arscaledx / 2);
            let arRectWidth = arscaledx;
            let arRectHeight = arscaledy;

            arPreviewRect.style.top = arRectTop + 'px';
            arPreviewRect.style.left = arRectLeft + 'px';
            arPreviewRect.style.width = arRectWidth + 'px';
            arPreviewRect.style.height = arRectHeight + 'px';

            clearTimeout(arFrameTimeout);
            arFrameTimeout = setTimeout(function () {
                arPreviewRect.style.display = 'none';
            }, 2000);

            arPreviewRect.style.display = 'block';
        }
    }

    onAfterUiUpdate(function () {
        let arPreviewRect = gradioApp().querySelector('#imageARPreview');
        if (arPreviewRect) {
            arPreviewRect.style.display = 'none';
        }
        let tabImg2img = gradioApp().querySelector("#tab_img2img");
        if (tabImg2img) {
            let inImg2img = tabImg2img.style.display == "block";
            if (inImg2img) {
                let inputs = gradioApp().querySelectorAll('input');
                inputs.forEach(function (e) {
                    let is_width = e.parentElement.id == "img2img_width";
                    let is_height = e.parentElement.id == "img2img_height";

                    if ((is_width || is_height) && !e.classList.contains('scrollwatch')) {
                        e.addEventListener('input', function (e) {
                            dimensionChange(e, is_width, is_height);
                        });
                        e.classList.add('scrollwatch');
                    }
                    if (is_width) {
                        currentWidth = e.value * 1.0;
                    }
                    if (is_height) {
                        currentHeight = e.value * 1.0;
                    }
                });
            }
        }
    });
})();