draft TextDropdown 11/152019-11-15

package powerlessri.harmonics.gui.widget;

import com.google.common.base.Preconditions;
import powerlessri.harmonics.gui.ITexture;
import powerlessri.harmonics.gui.Texture;
import powerlessri.harmonics.gui.widget.button.ColoredTextButton;
import powerlessri.harmonics.gui.widget.button.SimpleIconButton;
import powerlessri.harmonics.gui.widget.button.TextButton;
import powerlessri.harmonics.gui.widget.panel.Panel;
import powerlessri.harmonics.gui.widget.panel.VerticalList;

public class TextDropdown extends Dropdown<IWidget, Panel<IWidget>, VerticalList<ColoredTextButton>> {

    public static final ITexture TOGGLE_TO_EXPAND = Texture.portion();
    public static final ITexture TOGGLE_TO_EXPAND_HOVERED = Texture.portion();
    public static final ITexture TOGGLE_TO_COLLAPSE = Texture.portion();
    public static final ITexture TOGGLE_TO_COLLAPSE_HOVERED = Texture.portion();

    private TextField textField;

    public TextDropdown(int width, int height) {
        this(width, height, height * 8);
    }

    public TextDropdown(int width, int height, int listHeight) {
        super(new Panel<IWidget>() {
            {
                this.setDimensions(width, height);
            }

            @Override
            public void onInitialAttach() {
                TextDropdown parent = (TextDropdown) this.getParent();
                Preconditions.checkState(parent != null);

                this.addChildren(new TextField(width, height));

                SimpleIconButton toggle = new SimpleIconButton(TOGGLE_TO_EXPAND, TOGGLE_TO_EXPAND_HOVERED);
                toggle.setClickAction(b -> {
                    parent.toggle();
                    if (parent.isExpanded()) {
                        toggle.setTextures(TOGGLE_TO_COLLAPSE, TOGGLE_TO_COLLAPSE_HOVERED);
                    } else {
                        toggle.setTextures(TOGGLE_TO_EXPAND, TOGGLE_TO_EXPAND_HOVERED);
                    }
                });
                toggle.alignRight(getXRight());
                this.addChildren(toggle);
            }
        }, new VerticalList<>(width, listHeight));
        this.setBackgroundRenderer(0, IBackgroundRenderer.NOTHING);
        textField = (TextField) getLabel().getPanels().get(0);
    }

    public void addOption(String option) {
        getPanel().addChildren(ColoredTextButton.ofText(option, b -> {
            textField.setText(option);
            toggle();
        }));
    }

    public TextField getTextField() {
        return textField;
    }
}