Examples of java.awt.Component.invalidate()

java.awt.Component.invalidate()
Invalidates this component. This component and all parents above it are marked as needing to be laid out. This method can be called often, so it needs to execute quickly. @see #validate @see #doLayout @see LayoutManager @since JDK1.0

    Component c = new Component(){};
    f.add(c);
    f.setSize(100, 100);
    f.setVisible(true);


    c.invalidate();
    h.check(!c.isValid());
    c.validate();
    h.check(c.isValid());
  }

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  {
    h.checkPoint("notShowing");


    Component c = new Component(){};


    c.invalidate();
    h.check(!c.isValid());
    c.validate();
    h.check(!c.isValid());
  }
}

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    private void handleComponentChange(ComponentEvent e) {
        Component c = e.getComponent().getParent();
        if (c != null && !this.isAdjusting) {
          // TF:03/11/2008:Added in an invalidate, because our parent wasn't necessarily getting
          // laid out properly because it might still be valid.
          c.invalidate();
            c.validate();
            e.getComponent().validate();
        }
    }

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                // This is just clearing the value, it's like to be set again later to the real value, so do nothing here
                return;
            }
            Component c = ((JComponent)evt.getSource()).getParent();
            if (c != null) {
                c.invalidate();
                c.validate();
            }
        }
    }
}

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    private void handleComponentChange(ComponentEvent e) {
        Component c = e.getComponent().getParent();
        if (c != null && !this.isAdjusting) {
          // TF:03/11/2008:Added in an invalidate, because our parent wasn't necessarily getting
          // laid out properly because it might still be valid.
          c.invalidate();
            c.validate();
            e.getComponent().validate();
        }
    }

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                // This is just clearing the value, it's like to be set again later to the real value, so do nothing here
                return;
            }
            Component c = ((JComponent)evt.getSource()).getParent();
            if (c != null) {
                c.invalidate();
                c.validate();
            }
        }
    }
}

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            ((JComponent)comp).setMinimumSize(newSize );
        }
        else {
            comp.setSize(comp.getWidth(), this.value);
            // Force a layout
            comp.invalidate();
            comp.validate();
        }
    }
    public static void set(Component comp, int value){
        ActionMgr.addAction(new HeightInPixels(comp, value));

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            ((JComponent)comp).setMinimumSize(newSize );
        }
        else {
            comp.setSize(this.value, comp.getHeight());
            // Force a layout
            comp.invalidate();
            comp.validate();
        }
    }
    public static void set(Component comp, int value){
        ActionMgr.addAction(new WidthInPixels(comp, value));

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            ((JComponent)comp).setMinimumSize(newSize );
        }
        else {
            comp.setSize(comp.getWidth(), this.value);
            // Force a layout
            comp.invalidate();
            comp.validate();
        }
    }
    public static void set(Component comp, int value){
        ActionMgr.addAction(new HeightInPixels(comp, value));

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            ((JComponent)comp).setMinimumSize(newSize );
        }
        else {
            comp.setSize(this.value, comp.getHeight());
            // Force a layout
            comp.invalidate();
            comp.validate();
        }
    }
    public static void set(Component comp, int value){
        ActionMgr.addAction(new WidthInPixels(comp, value));

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