dorkbox.util.swing.NullRepaintManager Maven / Gradle / Ivy

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package dorkbox.util.swing;

import javax.swing.JComponent;
import javax.swing.RepaintManager;
import javax.swing.SwingUtilities;

/**
 * The NullRepaintManager is a RepaintManager that doesn't do any repainting. Useful when all of the rendering is done manually by the
 * application.
 */
public
class NullRepaintManager extends RepaintManager {
    /**
     * Installs the NullRepaintManager onto the EDT (WARNING: This disables painting/rendering by the EDT, for the entire JVM)
     */
    public static
    void install() {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public
            void run() {
                RepaintManager repaintManager = new NullRepaintManager();
                repaintManager.setDoubleBufferingEnabled(false);
                RepaintManager.setCurrentManager(repaintManager);
            }
        });
    }

    public
    void addInvalidComponent(JComponent c) {
        // do nothing
    }

    public
    void addDirtyRegion(JComponent c, int x, int y, int w, int h) {
        // do nothing
    }

    public
    void markCompletelyDirty(JComponent c) {
        // do nothing
    }

    public
    void paintDirtyRegions() {
        // do nothing
    }
}