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A themeable Look and Feel for java swing
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/*
 * MIT License
 *
 * Copyright (c) 2020 Jannis Weis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
 * associated documentation files (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
 * NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package com.github.weisj.darklaf.ui;

import java.awt.*;

import javax.swing.*;

import com.github.weisj.darklaf.util.DarkUIUtil;

public class WidgetPopupHelper {

    public static Rectangle getPopupBounds(final JComponent parent, final JComponent popup, final Dimension popupSize) {
        return getPopupBounds(parent, popup, popupSize, true, false);
    }

    public static Rectangle getPopupBounds(final JComponent parent, final JComponent popup, final Dimension popupSize,
            final boolean useParentSizeAsMinimum, final boolean alignOpposite) {
        Insets parentIns = parent.getInsets();
        Insets popupIns = popup.getInsets();

        // reduce the width of the popup by the insets so that the popup
        // is the same width as the parent.
        if (useParentSizeAsMinimum) {
            popupSize.width = Math.max(popupSize.width, parent.getWidth() - parentIns.left - parentIns.right);
        }
        // popupSize.width -= popupIns.left + popupIns.right;

        boolean ltr = parent.getComponentOrientation().isLeftToRight();
        if (alignOpposite) ltr = !ltr;

        int x = ltr ? parentIns.left : parent.getWidth() - parentIns.right - popupSize.width;

        return computePopupBounds(parent, x, parent.getHeight() - parentIns.bottom, popupSize.width, popupSize.height);
    }

    protected static Rectangle computePopupBounds(final JComponent parent, final int px, final int py, final int pw,
            final int ph) {
        Rectangle screenBounds = DarkUIUtil.getScreenBounds(parent, null);

        Point pos = parent.getLocationOnScreen();

        Insets ins = parent.getInsets();
        Rectangle rect = new Rectangle(pos.x + px, pos.y + py, pw, ph);

        adjustYCoordinate(screenBounds, pos, ins, rect);
        adjustXCoordinate(screenBounds, rect);
        rect.x -= pos.x;
        rect.y -= pos.y;

        return rect;
    }

    private static void adjustYCoordinate(final Rectangle screenBounds, final Point pos, final Insets ins,
            final Rectangle rect) {
        if (rect.y + rect.height > screenBounds.y + screenBounds.height) {
            // Popup would be covered by bottom screen edge.
            if (pos.y - rect.height - ins.top >= screenBounds.y) {
                // popup goes above
                rect.y = pos.y - rect.height - ins.top;
            } else {
                // popup will be vertically centered on screen
                rect.y = screenBounds.y + Math.max(0, (screenBounds.height - rect.height) / 2);
                rect.height = Math.min(screenBounds.height, rect.height);
            }
        }
    }

    private static void adjustXCoordinate(final Rectangle screenBounds, final Rectangle rect) {
        if (rect.x < screenBounds.x) {
            rect.width = Math.min(screenBounds.width, rect.width);
            rect.x = screenBounds.x;
        } else if (rect.x + rect.width > screenBounds.width + screenBounds.x) {
            rect.width = Math.min(screenBounds.width, rect.width);
            rect.x = screenBounds.x + screenBounds.width - rect.width;
        }
    }

}