design/designer-base/src/main/java/com/fr/design/report/fit/NewFitPreviewPane.java

package com.fr.design.report.fit;

import com.fr.base.GraphHelper;
import com.fr.general.FRFont;

import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;


public class NewFitPreviewPane extends JPanel {
    private boolean fitFont = false;
    private FitType fitType = FitType.DOUBLE_FIT;
    private static final Color DEFAULT_PAINT_COLOR = Color.decode("#419BF9");
    private static final int FIT_FONT_SIZE = 15;
    private static final int NO_FIT_FONT_SIZE = 10;
    private static final Dimension NO_FIT_CONTAINER_DIMENSION = new Dimension(230, 80);

    public NewFitPreviewPane(){

    }

    public NewFitPreviewPane(FitType fitType){
        this.fitType = fitType;
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        g.setColor(Color.GRAY);
        GraphHelper.drawRect(g, 1, 1, this.getWidth() - 2, this.getHeight() - 2);
        g.setColor(DEFAULT_PAINT_COLOR);
        FRFont textFont = FRFont.getInstance(FRFont.DEFAULT_FONTNAME, Font.PLAIN, fitFont ? FIT_FONT_SIZE : NO_FIT_FONT_SIZE);
        g.setFont(textFont);
        Dimension dimension = calculateCellDimension();
        GraphHelper.drawLine(g, 1, dimension.height, dimension.width * 2 - 1, dimension.height);
        GraphHelper.drawLine(g, dimension.width, 1, dimension.width, dimension.height * 2 - 1);
        GraphHelper.drawRect(g, 1, 1, dimension.width * 2 - 2, dimension.height * 2 - 2);
        double startX = calculateTextDrawStartX(dimension.width, this.getFontMetrics(textFont), "text1");
        double startY = calculateTextDrawStartY(dimension.height);
        GraphHelper.drawString(g, "text1", startX, startY);
        GraphHelper.drawString(g, "text2", dimension.width + startX, startY);
        GraphHelper.drawString(g, "text3", startX, dimension.height + startY);
        GraphHelper.drawString(g, "text4", dimension.width + startX, dimension.height + startY);
    }

    private Dimension calculateCellDimension() {
        if (fitType == FitType.DOUBLE_FIT) {
            return new Dimension(this.getWidth() / 2, this.getHeight() / 2);
        } else if (fitType == FitType.NOT_FIT) {
            return new Dimension(NO_FIT_CONTAINER_DIMENSION.width / 2, NO_FIT_CONTAINER_DIMENSION.height / 2);
        } else {
            return new Dimension(this.getWidth() / 2, NO_FIT_CONTAINER_DIMENSION.height / 2);
        }
    }

    private double calculateTextDrawStartX(int containerWidth, FontMetrics fontMetrics, String text) {
        return (containerWidth - fontMetrics.stringWidth(text)) / 2.0D;
    }

    private double calculateTextDrawStartY(int containerHeight) {
        return containerHeight / 2.0D;
    }

    public void refreshPreview(boolean fitFont, FitType fitType) {
        this.fitFont = fitFont;
        this.fitType = fitType;
        repaint();
    }

    public void refreshPreview(boolean fitFont) {
        this.fitFont = fitFont;
        repaint();
    }

}