com.viaoa.jfc.print.view.PreviewPanel Maven / Gradle / Ivy

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/*  Copyright 1999-2015 Vince Via [email protected]
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
    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.
*/
package com.viaoa.jfc.print.view;

import java.awt.Component;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.Rectangle;

import javax.swing.JPanel;
import javax.swing.JViewport;
import javax.swing.Scrollable;
import javax.swing.SwingConstants;


/**
 * Used to display PagePanels for the PrintPreviewDialog.
 * @author vincevia
 */
public class PreviewPanel extends JPanel implements Scrollable {
	protected int H_GAP = 16;
	protected int V_GAP = 10;
    protected int incScrollAmountX=30, incScrollAmountY=40;

	public Dimension getPreferredSize() {
		int n = getComponentCount();
		if (n == 0) return new Dimension(H_GAP, V_GAP);

		Component comp = getComponent(0);
		Dimension dc = comp.getPreferredSize();
		int w = dc.width;
		int h = dc.height;

		Dimension dp = getParent().getSize();
		int nCol = Math.max((dp.width-H_GAP)/(w+H_GAP), 1);
		int nRow = n/nCol;
		if (nRow*nCol < n) nRow++;

		int ww = nCol*(w+H_GAP) + H_GAP;
		int hh = nRow*(h+V_GAP) + V_GAP;
		Insets ins = getInsets();
		return new Dimension(ww+ins.left+ins.right,hh+ins.top+ins.bottom);
	}

	public Dimension getMaximumSize() {
		return getPreferredSize();
	}

	public Dimension getMinimumSize() {
		return getPreferredSize();
	}

	public void doLayout() {
		Insets ins = getInsets();
		int x = ins.left + H_GAP;
		int y = ins.top + V_GAP;

		int n = getComponentCount();
		if (n == 0)
			return;
		Component comp = getComponent(0);
		Dimension dc = comp.getPreferredSize();
		int w = dc.width;
		int h = dc.height;

		Dimension dp = getParent().getSize();
		int nCol = Math.max((dp.width-H_GAP)/(w+H_GAP), 1);
		int nRow = n/nCol;
		if (nRow*nCol < n)
			nRow++;

		int index = 0;
		for (int k = 0; k= n)
					return;
				comp = getComponent(index++);
				comp.setBounds(x, y, w, h);
				x += w+H_GAP;
			}
			y += h+V_GAP;
			x = ins.left + H_GAP;
		}
	}

    public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
        if (orientation == SwingConstants.HORIZONTAL) return (incScrollAmountX);
        return incScrollAmountY;
    }

    public Dimension getPreferredScrollableViewportSize() {
        return getPreferredSize();
    }

    public int getScrollableBlockIncrement(Rectangle visibleRect,int orientation,int direction) {
        JViewport vp = (JViewport) this.getParent();
        Dimension d2 = vp.getExtentSize();

        if (orientation == SwingConstants.HORIZONTAL) return d2.width;
        return d2.height;
    }

    public boolean getScrollableTracksViewportHeight() {
        return false;
    }

    public boolean getScrollableTracksViewportWidth() {
        return false;
    }
}