Java JFrame calculateMaxMenuItems(JFrame window)

Description

calculate Max Menu Items

License

Apache License

Declaration

public static int calculateMaxMenuItems(JFrame window) 

Method Source Code

//package com.java2s;
/*//  w  w w .  ja v a 2  s.  c om
 * WbSwingUtilities.java
 *
 * This file is part of SQL Workbench/J, http://www.sql-workbench.net
 *
 * Copyright 2002-2017, Thomas Kellerer
 *
 * Licensed under a modified Apache License, Version 2.0
 * that restricts the use for certain governments.
 * You may not use this file except in compliance with the License.
 * You may obtain a copy of the License at.
 *
 *     http://sql-workbench.net/manual/license.html
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * To contact the author please send an email to: support@sql-workbench.net
 *
 */

import java.awt.Dimension;

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.GraphicsConfiguration;

import java.awt.GraphicsEnvironment;

import java.awt.Insets;

import java.awt.Toolkit;

import javax.swing.JFrame;

import javax.swing.UIDefaults;
import javax.swing.UIManager;

public class Main {
    public static int calculateMaxMenuItems(JFrame window) {
        UIDefaults def = UIManager.getDefaults();
        Font itemFont = def.getFont("MenuItem.font");
        Font barFont = def.getFont("MenuBar.font");

        int itemHeight = 16;
        int barHeight = 24;

        FontMetrics fm = itemFont == null ? null : window
                .getFontMetrics(itemFont);
        if (fm != null) {
            itemHeight = fm.getHeight();
        } else if (itemFont != null) {
            itemHeight = convertPointSizeToPixel(itemFont.getSize());
        }
        FontMetrics barMetrics = barFont == null ? null : window
                .getFontMetrics(barFont);
        if (barMetrics != null) {
            barHeight = fm.getHeight();
        } else if (barFont != null) {
            barHeight = convertPointSizeToPixel(barFont.getSize());
        }

        Insets itemInsets = def.getInsets("MenuItem.margin");
        if (itemInsets != null) {
            itemHeight += itemInsets.top + itemInsets.bottom;
        }

        Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
        int screenHeight = (int) screen.getHeight();
        int usableHeight = screenHeight - barHeight * 3;
        int numItems = usableHeight / itemHeight;
        return numItems;
    }

    public static int convertPointSizeToPixel(int points) {
        int dpi = Toolkit.getDefaultToolkit().getScreenResolution();
        int pixel = points * dpi / 72;
        return pixel;
    }

    public static Dimension getScreenSize() {
        return getScreenSize(getScreenOffset());
    }

    public static Dimension getScreenSize(Insets insets) {
        Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();

        screen.width -= (insets.left + insets.right);
        screen.height -= (insets.bottom + insets.top);
        return screen;
    }

    public static Insets getScreenOffset() {
        GraphicsEnvironment ge = GraphicsEnvironment
                .getLocalGraphicsEnvironment();
        GraphicsConfiguration conf = ge.getDefaultScreenDevice()
                .getDefaultConfiguration();

        Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(conf);
        return insets;
    }
}

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