javax.swing.JComponent#doLayout ( )源码实例Demo

private Image getComponentImage(JComponent component) {
    // Initial component sizing & layout
    component.setSize((getClientSize().width == 0) ? component.getPreferredSize() : getClientSize()); // try to fit the component to ComponentMorpher
    component.doLayout(); // layout component

    // Correct component sizing & layout
    component.setSize(new Dimension(getClientSize().width, component.getPreferredSize().height)); // Width of component is fixed, update height
    component.doLayout(); // layout component

    // One more iteration because of nested JTextAreas
    component.setSize(new Dimension(getClientSize().width, component.getPreferredSize().height)); // Width of component is fixed, update height
    component.doLayout(); // layout component

    // Paint component into BufferedImage
    BufferedImage componentImage = new BufferedImage(component.getSize().width, component.getSize().height,
                                                     BufferedImage.TYPE_INT_RGB);
    component.printAll(componentImage.getGraphics());

    return componentImage;
}
 

private static void checkVisibility(JComponent comp) {
    if (comp == null) return;

    comp.invalidate();
    comp.revalidate();
    comp.doLayout();
    comp.repaint();

    for (Component c : comp.getComponents())
        if (c.isVisible()) {
            comp.setVisible(true);

            return;
        }

    comp.setVisible(false);
}
 

private Image getComponentImage(JComponent component) {
    // Initial component sizing & layout
    component.setSize((getClientSize().width == 0) ? component.getPreferredSize() : getClientSize()); // try to fit the component to ComponentMorpher
    component.doLayout(); // layout component

    // Correct component sizing & layout
    component.setSize(new Dimension(getClientSize().width, component.getPreferredSize().height)); // Width of component is fixed, update height
    component.doLayout(); // layout component

    // One more iteration because of nested JTextAreas
    component.setSize(new Dimension(getClientSize().width, component.getPreferredSize().height)); // Width of component is fixed, update height
    component.doLayout(); // layout component

    // Paint component into BufferedImage
    BufferedImage componentImage = new BufferedImage(component.getSize().width, component.getSize().height,
                                                     BufferedImage.TYPE_INT_RGB);
    component.printAll(componentImage.getGraphics());

    return componentImage;
}
 

public static void setZoomingEnabled(JComponent chartUI, boolean enabled) {
    SimpleXYChart chart = (SimpleXYChart)chartUI.getClientProperty("chart"); // NOI18N
    
    if (chart.isZoomingEnabled() == enabled) return;
    else chart.setZoomingEnabled(enabled);
    
    JPanel sidePanel = (JPanel)chartUI.getClientProperty("sidePanel"); // NOI18N
    JPanel scrollerPanel = (JPanel)chartUI.getClientProperty("scrollerPanel"); // NOI18N
    
    if (enabled) {
        TransparentToolBar toolbar = new TransparentToolBar(false);
        for (Action action : chart.getActions()) toolbar.addItem(action);
        sidePanel.add(toolbar);
        
        JScrollBar scroller = chart.getScroller();
        scroller.setSize(scroller.getPreferredSize());
        scrollerPanel.add(scroller);
        chart.putClientProperty("scroller", scroller); // NOI18N
    } else {
        sidePanel.removeAll();
        scrollerPanel.removeAll();
        chart.putClientProperty("scroller", null); // NOI18N
    }
    
    sidePanel.setVisible(enabled);
    
    chartUI.doLayout();
    chartUI.repaint();
}
 

public static void setLegendVisible(JComponent chartUI, boolean visible) {
    JPanel legendPanel = (JPanel)chartUI.getClientProperty("legendPanel"); // NOI18N
    legendPanel.setVisible(visible);
    
    chartUI.doLayout();
    chartUI.repaint();
}
 

/**
 * Creates a MockComponent that resembles the argument component.
 * <P>
 * Note this method will traverse c and its subcomponents and may
 * temporarily change properties of inner components: such as the focused
 * state, the visibility, etc.
 * <P>
 * The goal is of this component is not to mirror the exact state of a
 * component, but rather to provide a sample image of this component in its
 * plain, unmodified, unused state.
 * 
 * @param c
 */
public MockComponent(JComponent c) {
	Dimension preferredSize = c.getPreferredSize();
	Dimension currentSize = c.getSize();

	Dimension d = new Dimension(Math.max(preferredSize.width,
			currentSize.width), Math.max(preferredSize.height,
			currentSize.height));

	if (currentSize.width == 0 || currentSize.height == 0) {
		// if the component isn't visible yet
		c.setSize(d);
		c.doLayout();
	}

	storeState(c);

	image = new BufferedImage(d.width, d.height,
			BufferedImage.TYPE_INT_ARGB);

	Graphics2D g = image.createGraphics();
	g.setComposite(AlphaComposite.Clear);
	g.fillRect(0, 0, d.width, d.height);
	g.setComposite(AlphaComposite.SrcOver);

	c.paint(g);
	g.dispose();
	setPreferredSize(d);
	setMinimumSize(d);
	setMaximumSize(d);
	setOpaque(c.isOpaque());
	setName(c.getName());
	setToolTipText(c.getToolTipText());

	restoreState(c);
}
 

final void resizeContainer() {
    JComponent c = ( JComponent ) container.getParent();
    c.invalidate();
    c.revalidate();
    c.doLayout();
}