Function keepSI

Picviewer CE+/Picviewer CE+.user.js:22427–22479

(obj,offsetDirection,defaultValue, out)

                var windowSize=getWindowSize();

                function keepSI(obj,offsetDirection,defaultValue, out){
                    var objRect=obj.getBoundingClientRect();
                    var objStyle=obj.style;
                    var insert=false;

                    while(offsetDirection.length){
                        var oD=offsetDirection[0];
                        var oDV=defaultValue[0];
                        var outV=0;
                        if(out)outV=out.shift();
                        offsetDirection.shift();
                        defaultValue.shift();
                        var oValue=parseFloat(objStyle[oD]);
                        var newValue;
                        switch(oD){
                            case 'top':
                                newValue=oValue - objRect.top - outV;
                                if(objRect.top-outV<=0){
                                    newValue=Math.min(newValue,imgWindowFullSize.h);
                                }else{
                                    newValue=Math.max(newValue,oDV);
                                };
                                break;
                            case 'right':
                                newValue=oValue + (objRect.right - windowSize.w) + outV;
                                if(objRect.right+outV >= windowSize.w){//屏幕外
                                    newValue=Math.min(newValue,imgWindowFullSize.w);
                                }else{
                                    newValue=Math.max(newValue,oDV);
                                };
                                break;
                            case 'bottom':
                                newValue=oValue + (objRect.bottom - windowSize.h) + outV;
                                if(objRect.bottom+outV >= windowSize.h){//屏幕外
                                    newValue=Math.min(newValue,imgWindowFullSize.h);
                                }else{
                                    newValue=Math.max(newValue,oDV);
                                };
                                break;
                            case 'left':
                                newValue=oValue - objRect.left - outV;
                                if(objRect.left-outV<=0){
                                    newValue=Math.min(newValue,imgWindowFullSize.w);
                                }else{
                                    newValue=Math.max(newValue,oDV);
                                }
                                break;
                        }
                        insert=insert||newValue!==oDV;
                        objStyle[oD]=newValue + 'px';
                    }
                    insert ? obj.classList.add("insert") : obj.classList.remove("insert");
                }

                keepSI(this.closeButton,['top','right'],[-22,0]);
                keepSI(this.maxButton,['top','right'],[-22,46],[0,46]);