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package ch.asynk.gdx.boardgame.ui;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.math.Rectangle;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.glutils.HdpiUtils;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.NinePatch;
public class Scrollable extends Element
{
private Element child;
private int scissorIdx;
public boolean vScroll;
public boolean hScroll;
public Scrollable(Element child)
{
super();
this.vScroll = true;
this.hScroll = false;
this.scissorIdx = -1;
this.child = child;
child.setParent(this);
}
public Element getChild() { return child; }
public float getBestWidth()
{
return (child.getWidth() + (2 * padding));
}
public float getBestHeight()
{
return (child.getHeight() + (2 * padding));
}
public void computeDimensions()
{
child.computeDimensions();
}
@Override public void computeGeometry(Rectangle area, boolean resized)
{
if (resized || scissorIdx == -1)
setPosition(area.x, area.y, area.width, area.height);
child.computeGeometry(innerRect, resized);
clear();
}
@Override public Element touch(float x, float y)
{
if (innerRect.contains(x, y)) {
final Element touched = child.touch(x, y);
if (touched == child)
return this;
return touched;
}
return null;
}
@Override public boolean drag(float x, float y, int dx, int dy)
{
if (touch(x, y) == null) return false;
float tx = 0;
float ty = 0;
if (vScroll) {
if (dy < 0 && child.rect.y < innerRect.y) {
ty = Math.min(-dy, innerRect.y - child.rect.y);
} else if (dy > 0) {
float cly = innerRect.y + innerRect.height;
float chy = child.rect.y + child.rect.height;
if (chy > cly)
ty = -Math.min(dy, chy - cly);
}
}
if (hScroll) {
if (dx > 0 && child.rect.x < innerRect.x) {
tx = Math.min(dx, innerRect.x - child.rect.x);
}
else if (dx < 0) {
float clx = innerRect.x + innerRect.width;
float chx = child.rect.x + child.rect.width;
if (chx > clx)
tx = Math.max(dx, clx - chx);
}
}
child.translate(tx, ty);
return true;
}
@Override public void setPosition(float x, float y, float w, float h)
{
rect.set(x, y, w, h);
innerRect.set((x + padding), (y + padding), (w - 2 * padding), (h - 2 * padding));
scissorIdx = Scissors.compute(scissorIdx, innerRect);
child.setPositionClear(0, - (child.rect.height - innerRect.height), innerRect);
}
@Override public void drawReal(Batch batch)
{
batch.flush();
Rectangle scissor = Scissors.get(scissorIdx, innerRect);
HdpiUtils.glScissor((int)scissor.x, (int)scissor.y, (int)scissor.width, (int)scissor.height);
Gdx.gl.glEnable(GL20.GL_SCISSOR_TEST);
child.draw(batch);
batch.flush();
Gdx.gl.glDisable(GL20.GL_SCISSOR_TEST);
}
}
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