import com.sun.hotspot.igv.view.DiagramViewModel; //导入依赖的package包/类
@Override
public void performAction(DiagramViewModel model) {
    int fp = model.getFirstPosition();
    int sp = model.getSecondPosition();
    if (fp != 0) {
        int nfp = fp - 1;
        int nsp = sp - 1;
        model.setPositions(nfp, nsp);
    }
}
 

import com.sun.hotspot.igv.view.DiagramViewModel; //导入依赖的package包/类
@Override
public void update(DiagramViewModel model) {
    super.update(model);

    if (this.model != model) {
        if (this.model != null) {
            this.model.getDiagramChangedEvent().removeListener(this);
        }

        this.model = model;
        if (this.model != null) {
            this.model.getDiagramChangedEvent().addListener(this);
        }
    }
}
 

import com.sun.hotspot.igv.view.DiagramViewModel; //导入依赖的package包/类
@Override
public void performAction(DiagramViewModel model) {
    int fp = model.getFirstPosition();
    int sp = model.getSecondPosition();
    if (sp != model.getPositions().size() - 1) {
        int nfp = fp + 1;
        int nsp = sp + 1;
        model.setPositions(nfp, nsp);
    }
}
 

import com.sun.hotspot.igv.view.DiagramViewModel; //导入依赖的package包/类
@Override
public Class<DiagramViewModel> contextClass() {
    return DiagramViewModel.class;
}
 

import com.sun.hotspot.igv.view.DiagramViewModel; //导入依赖的package包/类
@Override
public boolean isEnabled(DiagramViewModel model) {
    return model.getFirstPosition() != 0;
}
 

import com.sun.hotspot.igv.view.DiagramViewModel; //导入依赖的package包/类
@Override
public void changed(DiagramViewModel source) {
    update(source);
}
 

import com.sun.hotspot.igv.view.DiagramViewModel; //导入依赖的package包/类
@Override
public boolean isEnabled(DiagramViewModel model) {
    return model.getSecondPosition() != model.getPositions().size() - 1;
}