javascript/aspectRatioOverlay.js

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
	}

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

	if(!inImg2img){
		return;
	}

	var targetElement = null;

    var 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){

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



		var viewportOffset = targetElement.getBoundingClientRect();

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

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

		cleintRectTop    = (viewportOffset.top+window.scrollY)
		cleintRectLeft   = (viewportOffset.left+window.scrollX)
		cleintRectCentreY = cleintRectTop  + (targetElement.clientHeight/2)
		cleintRectCentreX = cleintRectLeft + (targetElement.clientWidth/2)

		viewRectTop    = cleintRectCentreY-(scaledy/2)
		viewRectLeft   = cleintRectCentreX-(scaledx/2)
		arRectWidth  = scaledx
		arRectHeight = scaledy

		arscale = Math.min(  arRectWidth/currentWidth, arRectHeight/currentHeight )
		arscaledx = currentWidth*arscale
		arscaledy = currentHeight*arscale

		arRectTop    = cleintRectCentreY-(arscaledy/2)
		arRectLeft   = cleintRectCentreX-(arscaledx/2)
		arRectWidth  = arscaledx
		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';

	}

}


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