UI : add List

1 files changed, 82 insertions, 0 deletions

diff --git a/core/src/ch/asynk/gdx/boardgame/ui/List.java b/core/src/ch/asynk/gdx/boardgame/ui/List.java
new file mode 100644
index 0000000..19f08f2
--- /dev/null
+++ b/core/src/ch/asynk/gdx/boardgame/ui/List.java
@@ -0,0 +1,82 @@
+package ch.asynk.gdx.boardgame.ui;
+
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.g2d.GlyphLayout;
+import com.badlogic.gdx.graphics.g2d.TextureRegion;
+
+import ch.asynk.gdx.boardgame.utils.Collection;
+
+public class List extends Element
+{
+    public interface Item
+    {
+        public String s();
+    }
+
+    private BitmapFont font;
+    private GlyphLayout layout;
+    private float spacing;
+    private float itemHeight;
+    private Integer idx;
+    private Bg selected;
+    private Collection<Item> items;
+
+    public List(BitmapFont font, TextureRegion selected, float padding, float spacing)
+    {
+        this.font = font;
+        this.padding = padding;
+        this.spacing = spacing;
+        this.layout = new GlyphLayout();
+        this.idx = null;
+        this.selected = new Bg(selected);
+        this.selected.visible = false;
+    }
+
+    public void unselect() { idx = null; }
+    public Integer getIdx() { return idx; }
+    public Item getSelected() { return ((idx == null) ? null : items.get(idx)); }
+
+    @Override public boolean touch(float x, float y)
+    {
+        if (super.touch(x, y)) {
+            idx = (int) Math.floor((getInnerTop() - y) / itemHeight);
+            if ((idx >= 0) && (idx < items.size())) {
+                selected.setPosition(getX(), getInnerTop() - ((idx + 1) * itemHeight) + spacing / 2f, getWidth(), itemHeight);
+                selected.visible = true;
+                return true;
+            }
+        }
+        idx = null;
+        selected.visible = false;
+        return false;
+    }
+
+    public void setItems(Collection<Item> items)
+    {
+        unselect();
+        this.items = items;
+        float w = 0f;
+        for (Item e: items) {
+            layout.setText(font, e.s());
+            if (layout.width > w) w = layout.width;
+        }
+        itemHeight = (layout.height + spacing);
+
+        rect.width = w + (2 * padding);
+        rect.height = (itemHeight * items.size()) + (2 * padding) - spacing;
+    }
+
+    @Override public void draw(Batch batch)
+    {
+        if (!visible) return;
+
+        float x = getInnerX();
+        float y = getInnerTop();
+        for (Item e : items) {
+            font.draw(batch, e.s(), x, y);
+            y -= itemHeight;
+        }
+        selected.draw(batch);
+    }
+}