name.martingeisse.stackd.client.gui.element.TextLine.java Source code

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Here is the source code for name.martingeisse.stackd.client.gui.element.TextLine.java

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/**
 * Copyright (c) 2010 Martin Geisse
 *
 * This file is distributed under the terms of the MIT license.
 */

package name.martingeisse.stackd.client.gui.element;

import static org.lwjgl.opengl.GL14.glWindowPos2i;
import name.martingeisse.common.util.ParameterUtil;
import name.martingeisse.stackd.client.gui.Gui;
import name.martingeisse.stackd.client.gui.GuiElement;
import name.martingeisse.stackd.client.gui.GuiEvent;
import name.martingeisse.stackd.client.gui.util.Color;
import name.martingeisse.stackd.client.system.Font;
import org.lwjgl.opengl.GL11;

/**
 * This element draws a line of text. Its size depends solely on the
 * text and is not affected during layout.
 */
public final class TextLine extends GuiElement {

    /**
     * the font
     */
    private Font font;

    /**
     * the color
     */
    private Color color;

    /**
     * the text
     */
    private String text;

    /**
     * Constructor.
     */
    public TextLine() {
        this.font = null;
        this.color = Color.WHITE;
        this.text = "";
    }

    /**
     * Getter method for the font.
     * @return the font
     */
    public Font getFont() {
        return font;
    }

    /**
     * Setter method for the font.
     * @param font the font to set
     * @return this for chaining
     */
    public TextLine setFont(final Font font) {
        ParameterUtil.ensureNotNull(font, "font");
        this.font = font;
        requestLayout();
        return this;
    }

    /**
     * Getter method for the color.
     * @return the color
     */
    public Color getColor() {
        return color;
    }

    /**
     * Setter method for the color.
     * @param color the color to set
     * @return this for chaining
     */
    public TextLine setColor(Color color) {
        ParameterUtil.ensureNotNull(color, "color");
        this.color = color;
        return this;
    }

    /**
     * Getter method for the text.
     * @return the text
     */
    public String getText() {
        return text;
    }

    /**
     * Setter method for the text.
     * @param text the text to set
     * @return this for chaining
     */
    public TextLine setText(final String text) {
        ParameterUtil.ensureNotNull(text, "text");
        this.text = text;
        requestLayout();
        return this;
    }

    /**
     * 
     */
    public Font getEffectiveFont() {
        if (font == null) {
            final Gui gui = getGuiOrNull();
            return (gui == null ? null : gui.getDefaultFont());
        } else {
            return font;
        }
    }

    /**
     * 
     */
    private void computeSize() {
        final Font effectiveFont = getEffectiveFont();
        if (effectiveFont == null || text == null) {
            setSize(0, 0);
        } else {
            Gui gui = getGui();
            int textWidth = gui.pixelsToUnitsInt(effectiveFont.getStringWidth(text));
            int textHeight = gui.pixelsToUnitsInt(effectiveFont.getCharacterHeight());
            setSize(textWidth, textHeight);
        }
    }

    /* (non-Javadoc)
     * @see name.martingeisse.stackd.client.gui.GuiElement#handleEvent(name.martingeisse.stackd.client.gui.GuiEvent)
     */
    @Override
    public void handleEvent(final GuiEvent event) {
        if (event == GuiEvent.DRAW) {
            final Font effectiveFont = getEffectiveFont();
            GL11.glDisable(GL11.GL_TEXTURE_2D);
            GL11.glEnable(GL11.GL_BLEND);
            GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
            GL11.glPixelTransferf(GL11.GL_RED_SCALE, 0.0f);
            GL11.glPixelTransferf(GL11.GL_GREEN_SCALE, 0.0f);
            GL11.glPixelTransferf(GL11.GL_BLUE_SCALE, 0.0f);
            GL11.glPixelTransferf(GL11.GL_ALPHA_SCALE, 1.0f);
            GL11.glPixelTransferf(GL11.GL_RED_BIAS, color.getRed() / 255.0f);
            GL11.glPixelTransferf(GL11.GL_GREEN_BIAS, color.getGreen() / 255.0f);
            GL11.glPixelTransferf(GL11.GL_BLUE_BIAS, color.getBlue() / 255.0f);
            GL11.glPixelTransferf(GL11.GL_ALPHA_BIAS, 0.0f);

            // TODO scale font so text doesn't become smaller with higher resolution
            Gui gui = getGui();
            int x = gui.unitsToPixelsInt(getAbsoluteX());
            int y = getGui().getHeightPixels() - gui.unitsToPixelsInt(getAbsoluteY());
            glWindowPos2i(x, y);

            effectiveFont.drawText(text, 1.0f, Font.ALIGN_LEFT, Font.ALIGN_TOP);
        }
    }

    /* (non-Javadoc)
     * @see name.martingeisse.stackd.client.gui.GuiElement#finishLayoutSize(int, int)
     */
    @Override
    public void requestSize(final int width, final int height) {
        computeSize();
    }

}