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• Component.java

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com.googlecode.lanterna.gui2.Component Maven / Gradle / Ivy

/*
 * This file is part of lanterna (http://code.google.com/p/lanterna/).
 * 
 * lanterna is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 * 
 * Copyright (C) 2010-2017 Martin Berglund
 */
package com.googlecode.lanterna.gui2;

import com.googlecode.lanterna.TerminalPosition;
import com.googlecode.lanterna.TerminalSize;
import com.googlecode.lanterna.graphics.Theme;
import com.googlecode.lanterna.graphics.ThemeDefinition;

/**
 * This is the main interface defining a component in Lanterna, although you will probably not implement this directly
 * but rather extend the {@code AbstractComponent} or another one of the sub-classes instead to avoid implementing most
 * of the methods in this interface.
 * @author Martin
 */
public interface Component extends TextGUIElement {
    /**
     * Returns the top-left corner of this component, measured from its parent.
     * @return Position of this component
     */
    TerminalPosition getPosition();

    /**
     * This method will be called by the layout manager when it has decided where the component is to be located. If you
     * call this method yourself, prepare for unexpected results.
     * @param position Top-left position of the component, relative to its parent
     * @return Itself
     */
    Component setPosition(TerminalPosition position);

    /**
     * Returns how large this component is. If the layout manager has not yet laid this component out, it will return
     * an empty size (0x0)
     * @return How large this component is
     */
    TerminalSize getSize();

    /**
     * This method will be called by the layout manager when it has decided how large the component will be. If you call
     * this method yourself, prepare for unexpected results.
     * @param size Current size of the component
     * @return Itself
     */
    Component setSize(TerminalSize size);

    /**
     * Returns the ideal size this component would like to have, in order to draw itself properly. There are no
     * guarantees the GUI system will decide to give it this size though.
     * @return Size we would like to be
     */
    TerminalSize getPreferredSize();


    /**
     * Overrides the components preferred size calculation and makes the {@code getPreferredSize()} always return the
     * value passed in here. If you call this will {@code null}, it will re-enable the preferred size calculation again.
     * Please note that using this method on components that are not designed to work with arbitrary sizes make have
     * unexpected behaviour.
     * @param explicitPreferredSize Preferred size we want to use for this component
     * @return Itself
     */
    Component setPreferredSize(TerminalSize explicitPreferredSize);

    /**
     * Sets optional layout data associated with this component. This meaning of this data is up to the layout manager
     * to figure out, see each layout manager for examples of how to use it.
     * @param data Layout data associated with this component
     * @return Itself
     */
    Component setLayoutData(LayoutData data);

    /**
     * Returns the layout data associated with this component. This data will optionally be used by the layout manager,
     * see the documentation for each layout manager for more details on valid values and their meaning.
     * @return This component's layout data
     */
    LayoutData getLayoutData();
    
    /**
     * Returns the container which is holding this container, or {@code null} if it's not assigned to anything.
     * @return Parent container or null
     */
    Container getParent();

    /**
     * Returns {@code true} if the supplied Container is either the direct or indirect Parent of this component.
     * @param parent Container to test if it's the parent or grand-parent of this component
     * @return {@code true} if the container is either the direct or indirect parent of this component, otherwise {@code false}
     */
    boolean hasParent(Container parent);
    
    /**
     * Returns the TextGUI that this component is currently part of. If the component hasn't been added to any container
     * or in any other way placed into a GUI system, this method will return null.
     * @return The TextGUI that this component belongs to, or null if none
     */
    TextGUI getTextGUI();

    /**
     * Returns the {@link Theme} this component should be rendered using. The default implementation through
     * {@link AbstractComponent} will retrieve this from the {@link Window} the component belongs to, or return the
     * default theme if the component has not been added to a window yet. You can override the theme this component is
     * assigned to by calling {@link #setTheme(Theme)}.
     * @return The currently active {@link Theme} for this component
     */
    Theme getTheme();

    /**
     * Returns the {@link ThemeDefinition} defined in the current {@link Theme} for this component class. The is the
     * same as calling:
     * 
     *     component.getTheme().getThemeDefinition(ComponentClassType.class);
     *     // i.e button.getTheme().getThemeDefinition(Button.class);
     * 
     * @return {@link ThemeDefinition} defined in the current {@link Theme} for this component class
     */
    ThemeDefinition getThemeDefinition();

    /**
     * Overrides the {@link Theme} this component will use so rather than deriving the theme from either the window or
     * the GUI system, it will always return this theme. If you call this with {@code null}, it remove the override and
     * the next call to {@link #getTheme()} will again try to derive the theme by looking at the window or the GUI
     * system.
     * @param theme {@link Theme} to assign to this component, or {@code null} to use whatever the window uses
     * @return Itself
     */
    Component setTheme(Theme theme);
    
    /**
     * Returns true if this component is inside of the specified Container. It might be a direct child or not, this 
     * method makes no difference. If {@code getParent()} is not the same instance as {@code container}, but if this 
     * method returns true, you can be sure that this component is not a direct child.
     * @param container Container to test if this component is inside
     * @return True if this component is contained in some way within the {@code container}
     */
    boolean isInside(Container container);

    /**
     * Returns the renderer used to draw this component and measure its preferred size. You probably won't need to call
     * this method unless you know exactly which ComponentRenderer implementation is used and you need to customize it.
     * @return Renderer this component is using
     */
    ComponentRenderer getRenderer();

    /**
     * Marks the component as invalid and requiring to be re-drawn at next opportunity. Container components should take
     * this as a hint to layout the child components again.
     */
    void invalidate();
    
    /**
     * Takes a border object and moves this component inside it and then returns it again. This makes it easy to quickly
     * wrap a component on creation, like this:
     * 
     * container.addComponent(new Button("Test").withBorder(Borders.singleLine()));
     * 
     * @param border Border to wrap the component with
     * @return The border with this component wrapped
     */
    Border withBorder(Border border);
    
    /**
     * Translates a position local to the container to the base pane's coordinate space. For a window-based GUI, this 
     * be a coordinate in the window's coordinate space. If the component belongs to no base pane, it will return
     * {@code null}.
     * @param position Position to translate (relative to the container's top-left corner)
     * @return Position in base pane space, or {@code null} if the component is an orphan
     */
    TerminalPosition toBasePane(TerminalPosition position);

    /**
     * Translates a position local to the container to global coordinate space. This should be the absolute coordinate
     * in the terminal screen, taking no windows or containers into account. If the component belongs to no base pane,
     * it will return {@code null}.
     * @param position Position to translate (relative to the container's top-left corner)
     * @return Position in global (or absolute) coordinates, or {@code null} if the component is an orphan
     */
    TerminalPosition toGlobal(TerminalPosition position);

    /**
     * Returns the BasePane that this container belongs to. In a window-based GUI system, this will be a Window.
     * @return The base pane this component is placed on, or {@code null} if none
     */
    BasePane getBasePane();

    /**
     * Same as calling {@code panel.addComponent(thisComponent)}
     * @param panel Panel to add this component to
     * @return Itself
     */
    Component addTo(Panel panel);
    
    /**
     * Called by the GUI system when you add a component to a container; DO NOT CALL THIS YOURSELF! 
     * @param container Container that this component was just added to
     */
    void onAdded(Container container);
    
    /**
     * Called by the GUI system when you remove a component from a container; DO NOT CALL THIS YOURSELF! 
     * @param container Container that this component was just removed from
     */
    void onRemoved(Container container);
}