GUI Library/GUI

public class GUI {

    //LAYER VARIABLES
    Layer[] layers;
    boolean[] layerVisibility; // -NOT USED YET-
    boolean isFirstLocked, isLastLocked; // -NOT USED YET- For locking the position of a layer
    boolean isScrolling = false; // -NOT USED YET- Activates scroll bar

    //EVENT VARIABLES
    int lastEvent; // -NOT USED YET- Last event triggered by an element in any layer
    int mouseX, mouseY, deltaX, deltaY; // Mouse input

    public GUI(Layer[] layers){
        this.layers = layers;

    }

    // Updates UI positioning and events
    public void update(){
        int clickedLayer = computeClickedLayer();

        if(clickedLayer<layers.length){
            orderLayers(clickedLayer);

            System.out.println(layers[0].ID+" "+layers[0].vMax);

            int clickedElement = layers[0].computeClickedElement(mouseX, mouseY);

            if(clickedElement<layers[0].elements.length)
                layers[0].elements[clickedElement].triggerEvent();
            else if((clickedElement == layers[0].elements.length+1)||(clickedElement == layers[0].elements.length+2)){
                layers[0].scroll(deltaX, deltaY, clickedElement-layers[0].elements.length);
            }else if(clickedElement == layers[0].elements.length+3){
                layers[0].resize(deltaX, deltaY);
            }else{
                layers[0].translate(deltaX, deltaY);
            }
        }
        System.out.println(mouseX+" "+mouseY+" "+deltaX+" "+deltaY);
    }

    public int computeClickedLayer(){
        int clickedLayer = layers.length;

        for(int i=0; i<layers.length; i++){
            if(layers[i].geomVisible.x1 < mouseX){
                if(layers[i].geomVisible.x2 > mouseX){
                    if(layers[i].geomVisible.y1 < mouseY){
                        if(layers[i].geomVisible.y2 > mouseY){
                            clickedLayer = i;
                            i = layers.length;
                        }
                    }
                }
            }
        }

        return clickedLayer;
    }

    public void orderLayers(int clickedLayer){
        Layer tempA = layers[clickedLayer];

        for(int i=clickedLayer; i>0; i--){
            layers[i] = layers[i-1];
        }
        layers[0] = tempA;
    }

}