Adding more implementations and fixes

src/main/java/org/saturnclient/ui/Element.java

@@ -0,0 +1,89 @@
+package org.saturnclient.ui;
+
+import org.saturnclient.ui.anim.Animation;
+
+public class Element {
+    public int x;
+    public int y;
+    public int width;
+    public int height;
+    public float opacity = 1.0f;
+    public boolean focused;
+    public Animation animation;
+    public float scale = 1.0f;
+    public Integer duration = null; // Element duration, will fade out if not null
+
+    public void render(RenderScope renderScope, ElementContext ctx) {
+    }
+
+    public void click(int mouseX, int mouseY) {
+    }
+
+    public void scroll(int mouseX, int mouseY, double horizontalAmount, double verticalAmount) {
+    }
+
+    public void keyPressed(int keyCode, int scanCode, int modifiers) {
+    }
+
+    public void charTyped(char typedChar) {
+    }
+
+    public void mouseClicked(double mouseX, double mouseY, int button) {
+    }
+
+    public void mouseDragged(double mouseX, double mouseY, int button, double deltaX, double deltaY) {
+    }
+
+    public void mouseReleased(double mouseX, double mouseY, int button) {
+    }
+
+    public void playAnimationFrame(long elapsed) {
+        if (this.animation != null && elapsed >= this.animation.delay) {
+            this.animation.tick(this.animation.curve
+                    .apply(Math.min(1.0, (double) (elapsed - this.animation.delay) / this.animation.duration)), this);
+        }
+    }
+
+    public Element dimensions(int width, int height) {
+        this.width = width;
+        this.height = height;
+
+        return this;
+    }
+
+    public Element position(int x, int y) {
+        this.x = x;
+        this.y = y;
+
+        return this;
+    }
+
+    public Element centerHorizontal(int w, int h, int offsetX, int offsetY) {
+        this.x = (w - (int) (width * scale)) / 2 + offsetX;
+        this.y = offsetY;
+
+        return this;
+    }
+
+    public Element center(int w, int h) {
+        this.centerOffset(w, h, 0, 0);
+        return this;
+    }
+
+    public Element centerOffset(int w, int h, int offsetX, int offsetY) {
+        this.x = (w - (int) (width * scale)) / 2 + offsetX;
+        this.y = (h - (int) (height * scale)) / 2 + offsetY;
+
+        return this;
+    }
+
+    public Element animation(Animation animation) {
+        this.animation = animation;
+        return this;
+    }
+
+    public Element scale(float scale) {
+        this.scale = scale;
+        return this;
+    }
+}