add ui/Scrollable

1 files changed, 87 insertions, 0 deletions

diff --git a/core/src/ch/asynk/rustanddust/ui/Scrollable.java b/core/src/ch/asynk/rustanddust/ui/Scrollable.java
new file mode 100644
index 0000000..7548239
--- /dev/null
+++ b/core/src/ch/asynk/rustanddust/ui/Scrollable.java
@@ -0,0 +1,87 @@
+package ch.asynk.rustanddust.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 Widget
+{
+    private float offset;
+    private Widget child;
+    private NinePatch patch;
+    private Rectangle clip;
+
+    public Scrollable(Widget child)
+    {
+        this(child, null);
+    }
+
+    public Scrollable(Widget child, NinePatch patch)
+    {
+        super();
+        this.offset = 0f;
+        this.padding = 10f;
+        this.child = child;
+        this.patch = patch;
+        this.clip = new Rectangle();
+        if (patch != null)
+            setPosition(0, 0, patch.getTotalWidth(), patch.getTotalHeight());
+    }
+
+    public Widget getChild() { return child; }
+
+    @Override
+    public boolean hit(float x, float y)
+    {
+        if (!super.hit(x, y)) return false;
+        child.hit(x, y);
+        return true;
+    }
+
+    public float getBestWidth()
+    {
+        return (child.getWidth() + (2 * padding));
+    }
+
+    public boolean drag(float x, float y, int dx, int dy)
+    {
+        child.translate(0, dy);
+        if (child.getY() > (getY() + padding))
+            child.rect.y = (getY() + padding);
+        if (child.getTop() < (getTop() - padding))
+            child.rect.y = (getTop() - padding - child.getHeight());
+        return true;
+    }
+
+    @Override
+    public void dispose()
+    {
+        child.dispose();
+    }
+
+    @Override
+    public void setPosition(float x, float y, float w, float h)
+    {
+        rect.set(x, y, w, h);
+        child.setPosition((x + padding), (getTop() - padding - child.getHeight()));
+        clip.set((getX() + padding), (getY() + padding), (getWidth() - (2 * padding)), (getHeight() - (2 * padding)));
+    }
+
+    @Override
+    public void draw(Batch batch)
+    {
+        if (!visible) return;
+
+        if (patch != null)
+            patch.draw(batch, rect.x, rect.y, rect.width, rect.height);
+        batch.flush();
+        HdpiUtils.glScissor((int) clip.x, (int) clip.y, (int) clip.width, (int) clip.height);
+        Gdx.gl.glEnable(GL20.GL_SCISSOR_TEST);
+        child.draw(batch);
+        batch.flush();
+        Gdx.gl.glDisable(GL20.GL_SCISSOR_TEST);
+    }
+}