Java Component.invalidate方法代码示例

import java.awt.Component; //导入方法依赖的package包/类
public void setText(String text) {
    if (button != null) {
        String _text = button.getText();
        button.setText(text);
        
        Component parent = getParent();
        if (!Objects.equals(text, _text) && parent != null) {
            parent.invalidate();
            parent.revalidate();
            parent.repaint();
        }
    }
}
 

import java.awt.Component; //导入方法依赖的package包/类
public void setIcon(Icon icon) {
    if (button != null) {
        Icon _icon = button.getIcon();
        button.setIcon(icon);
        
        Component parent = getParent();
        if (!Objects.equals(icon, _icon) && parent != null) {
            parent.invalidate();
            parent.revalidate();
            parent.repaint();
        }
    }
}
 

import java.awt.Component; //导入方法依赖的package包/类
/** Installs the component we will embed to display the property */
private void installDisplayerComponent() {
    //Fetch or instantiate the component we will embed to display the 
    //property.  Depending on the prefs, it may be a RendererPropertyDisplayer,
    //an EditablePropertyDisplayer or a CustomPropertyDisplayer.
    PropertyDisplayer displayer = getPropertyDisplayer();

    //Find who has focus now, so if we have focus, focus won't end up set
    //to null
    Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getPermanentFocusOwner();

    boolean hadFocus = (focusOwner == this) || isAncestorOf(focusOwner);

    if (hadFocus) {
        //If we had focus, clear the global focus owner for now, so that
        //when the existing component is removed, it does not cause
        //focus to get briefly set to a random component
        KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwner();
    }

    //Fetch the new inner component (the custom editor or Inplace editor)
    Component newInner = displayer.getComponent();

    //Set the enabled state appropriately.  For implementations of 
    //PropertyDisplayer_Editable, this will already be handled; for render-
    //only cases, it should be handled explicitly
    if (!(displayer instanceof PropertyDisplayer_Editable)) {
        //only for renderers
        newInner.setEnabled(isEnabled() && getProperty().canWrite());
    }

    newInner.setForeground(getForeground());
    newInner.setBackground(getBackground());

    //Make sure the inner component has really changed
    if (newInner != inner) {
        synchronized (getTreeLock()) {
            //remove the odl component
            if (inner != null) {
                remove(inner);
            }

            //and add the new one (if any)
            if (newInner != null) {
                add(newInner);

                //invalidate its layout so it will be re-laid out
                newInner.invalidate();
                inner = newInner;
            }
        }
    }

    //Force a re-layout immediately if visible
    if (isShowing() && !(getParent() instanceof javax.swing.CellRendererPane)) {
        validate();
    }

    //Restore focus if necessary
    if (hadFocus && isEnabled() && ((preferences & PREF_READ_ONLY) == 0)) {
        requestFocus();
    }

    //Simply adding a component to a container can sometimes cause it to be
    //given focus even though it's not focusable.  If this has happened,
    //find the next component in the focus cycle root and force focus to that.
    //Mainly a problem with JFileChooser, but we also have a few property
    //editors that force focus on addNotify which should be fixed
    if (!isEnabled() || ((preferences & PREF_READ_ONLY) != 0)) {
        Component focus = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();

        if ((focus == inner) || ((inner instanceof Container) && ((Container) inner).isAncestorOf(focus))) {
            this.transferFocusUpCycle();
        }
    }
}