ScrollLayout.java

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/*
 * Gridarta MMORPG map editor for Crossfire, Daimonin and similar games.
 * Copyright (C) 2000-2023 The Gridarta Developers.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
package net.sf.gridarta.textedit.textarea;
 
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.util.ArrayList;
import java.util.Collection;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
 
public class ScrollLayout implements LayoutManager {
 
    public static final String CENTER = "center";
 
    public static final String RIGHT = "right";
 
    public static final String BOTTOM = "bottom";
 
    private static final String LEFT_OF_SCROLL_BAR = "los";
 
    @Nullable
    private Component center;
 
    @Nullable
    private Component right;
 
    @Nullable
    private Component bottom;
 
    @NotNull
    private final Collection<Component> leftOfScrollBar = new ArrayList<>();
 
    @NotNull
    private final Container textArea;
 
    public ScrollLayout(@NotNull final Container textArea) {
        this.textArea = textArea;
    }
 
    @Override
    public void addLayoutComponent(@NotNull final String name, @NotNull final Component comp) {
        switch (name) {
        case CENTER:
            center = comp;
            break;
 
        case RIGHT:
            right = comp;
            break;
 
        case BOTTOM:
            bottom = comp;
            break;
 
        case LEFT_OF_SCROLL_BAR:
            leftOfScrollBar.add(comp);
            break;
        }
    }
 
    @Override
    public void removeLayoutComponent(@NotNull final Component comp) {
        if (center == comp) {
            center = null;
        }
 
        if (right == comp) {
            right = null;
        }
 
        if (bottom == comp) {
            bottom = null;
        } else {
            leftOfScrollBar.remove(comp);
        }
    }
 
    @NotNull
    @Override
    public Dimension preferredLayoutSize(@NotNull final Container parent) {
        final Dimension dim = new Dimension();
        final Insets insets = textArea.getInsets();
        dim.width = insets.left + insets.right;
        dim.height = insets.top + insets.bottom;
 
        if (center != null) {
            final Dimension centerPref = center.getPreferredSize();
            dim.width += centerPref.width;
            dim.height += centerPref.height;
        }
        if (right != null) {
            final Dimension rightPref = right.getPreferredSize();
            dim.width += rightPref.width;
        }
        if (bottom != null) {
            final Dimension bottomPref = bottom.getPreferredSize();
            dim.height += bottomPref.height;
        }
 
        return dim;
    }
 
    @NotNull
    @Override
    public Dimension minimumLayoutSize(@NotNull final Container parent) {
        final Dimension dim = new Dimension();
        final Insets insets = textArea.getInsets();
        dim.width = insets.left + insets.right;
        dim.height = insets.top + insets.bottom;
 
        if (center != null) {
            final Dimension centerPref = center.getMinimumSize();
            dim.width += centerPref.width;
            dim.height += centerPref.height;
        }
        if (right != null) {
            final Dimension rightPref = right.getMinimumSize();
            dim.width += rightPref.width;
        }
        if (bottom != null) {
            final Dimension bottomPref = bottom.getMinimumSize();
            dim.height += bottomPref.height;
        }
 
        return dim;
    }
 
    @Override
    public void layoutContainer(@NotNull final Container parent) {
        final Dimension size = parent.getSize();
        final Insets insets = parent.getInsets();
        final int insetsTop = insets.top;
        int insetsLeft = insets.left;
        final int insetsBottom = insets.bottom;
        final int insetsRight = insets.right;
 
        final int rightWidth = right == null ? 0 : right.getPreferredSize().width;
        final int bottomHeight = bottom == null ? 0 : bottom.getPreferredSize().height;
        final int centerWidth = size.width - rightWidth - insetsLeft - insetsRight;
        final int centerHeight = size.height - bottomHeight - insetsTop - insetsBottom;
 
        if (center != null) {
            center.setBounds(insetsLeft, insetsTop, centerWidth, centerHeight);
        }
 
        if (right != null) {
            right.setBounds(insetsLeft + centerWidth, insetsTop, rightWidth, centerHeight);
        }
 
        // Lay out all status components, in order
        for (final Component comp : leftOfScrollBar) {
            final Dimension dim = comp.getPreferredSize();
            comp.setBounds(insetsLeft, insetsTop + centerHeight, dim.width, bottomHeight);
            insetsLeft += dim.width;
        }
 
        if (bottom != null) {
            bottom.setBounds(insetsLeft, insetsTop + centerHeight, size.width - rightWidth - insetsLeft - insetsRight, bottomHeight);
        }
    }
 
}