CellRenderer.java

/*******************************************************************************
 * Copyright 2014 Rafael Garcia Moreno.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.bladecoder.engineeditor.ui.panels;

import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.scenes.scene2d.utils.Drawable;
import com.bladecoder.engineeditor.ui.panels.CustomList.CustomListStyle;

public class CellRenderer<T> {
	private static final float MARGIN = 10;

	private CustomListStyle style;
	private float itemHeight;
	private float textOffsetX, textOffsetY;

	public CellRenderer() {
	}

	public void draw(Batch batch, float parentAlpha, T item, boolean selected, float x, float y, float width,
			float height) {
		BitmapFont font = style.font;
		Drawable selectedDrawable = style.selection;
		Color fontColorSelected = style.fontColorSelected;
		Color fontColorUnselected = style.fontColorUnselected;

		if (selected) {
			selectedDrawable.draw(batch, x, y - height, width, height);
			font.setColor(fontColorSelected.r, fontColorSelected.g, fontColorSelected.b,
					fontColorSelected.a * parentAlpha);
		} else {
			font.setColor(fontColorUnselected.r, fontColorUnselected.g, fontColorUnselected.b,
					fontColorUnselected.a * parentAlpha);
		}

		if (hasImage()) {
			TextureRegion r = getCellImage(item);

			float ih = r.getRegionHeight();
			float iw = r.getRegionWidth();

			if (ih > getItemHeight() - MARGIN) {
				ih = getItemHeight() - MARGIN;
				iw *= ih / r.getRegionHeight();
			}

			batch.draw(r, x, y - ih - MARGIN / 2, iw, ih);
			x += iw;
		}

		font.draw(batch, getCellTitle(item), x + textOffsetX, y - textOffsetY);

		if (hasSubtitle()) {
			String sub = getCellSubTitle(item);

			if (sub != null) {
				if (selected) {
					style.subtitleFont.setColor(fontColorSelected.r, fontColorSelected.g, fontColorSelected.b,
							fontColorSelected.a * parentAlpha * 0.5f);
				} else {
					style.subtitleFont.setColor(fontColorUnselected.r, fontColorUnselected.g, fontColorUnselected.b,
							fontColorUnselected.a * parentAlpha * 0.5f);
				}

				style.subtitleFont.draw(batch, sub, x + textOffsetX,
						y - textOffsetY - (font.getCapHeight() - font.getDescent() * 2));
			}
		}
	}

	protected boolean hasSubtitle() {
		return false;
	}

	protected boolean hasImage() {
		return false;
	}

	public void layout(CustomListStyle style) {
		this.style = style;

		BitmapFont font = style.font;
		Drawable selectedDrawable = style.selection;

		textOffsetX = selectedDrawable.getLeftWidth();
		textOffsetY = selectedDrawable.getTopHeight() - font.getDescent();

		itemHeight = font.getCapHeight() - font.getDescent() * 2;

		if (hasSubtitle()) {
			itemHeight += style.subtitleFont.getCapHeight() - style.subtitleFont.getDescent() * 2;
			;
		}

		itemHeight += selectedDrawable.getTopHeight() + selectedDrawable.getBottomHeight();
	}

	public float getItemHeight() {
		return itemHeight;
	}

	protected String getCellTitle(T item) {
		return item.toString();
	}

	protected String getCellSubTitle(T item) {
		return null;
	}

	protected TextureRegion getCellImage(T item) {
		return null;
	}
}