如何刪除Eclipse插件中的空白空間？

Question

我是Eclipse插件開發的初學者。

我已經開發了一些Eclipse插件使用星雲在於提供擴展視圖分量例如圖形，表格等

我想繪製在視圖中三種組分（使用MeterFigure，SWT的列表，XYGraph）。

但是，當我創建三個組件時，視圖中有空白！

所以，我檢查我的代碼，但我找不到問題在哪裏。

這是空白的捕獲（請參閱圖和文本之間的空白）。

這是創建三個組件的代碼。

@Override 
    public void createPartControl(Composite parent) { 
     ... 
     GridLayout layout = new GridLayout(1, true); 
     parent.setLayout(layout); 
     parent.setLayoutData(new GridData(GridData.GRAB_VERTICAL)); 

     merterFigure = new merterFigureClass(parent, SWT.NONE); 
     GridData gridData = new GridData(); 
     gridData.horizontalAlignment = GridData.FILL; 
     gridData.verticalAlignment = GridData.FILL; 
     gridData.grabExcessHorizontalSpace = true; 
     gridData.grabExcessVerticalSpace = true; 
     merterFigure.setLayoutData(gridData); 

     list = new ListClass(parent, SWT.NONE); 
     gridData = new GridData(); 
     gridData.horizontalAlignment = GridData.FILL; 
     gridData.verticalAlignment = GridData.FILL; 
     gridData.grabExcessHorizontalSpace = true; 
     gridData.grabExcessVerticalSpace = true; 
     list.setLayoutData(gridData); 
     list.initialize(); 

     graph = new GraphClass(parent, SWT.NONE); 
     gridData = new GridData(); 
     gridData.horizontalAlignment = GridData.FILL; 
     gridData.verticalAlignment = GridData.FILL; 
     gridData.grabExcessHorizontalSpace = true; 
     gridData.grabExcessVerticalSpace = true; 
     graph.setLayoutData(gridData); 

     list.setGraph(graph); 
    } 

這是MeterFigureClass。

public class MeterFigureClass extends Canvas { 
     private MeterFigure meterFigure; 

     public MeterFigureClass(Composite parent, int style) { 
      super(parent, style); 

      LightweightSystem lws = new LightweightSystem(this); 
      meterFigure = new MeterFigure(); 
      meterFigure.setBackgroundColor(XYGraphMediaFactory.getInstance().getColor(255, 255, 255)); 
      meterFigure.setValueLabelVisibility(true); 
      meterFigure.setRange(0, 100); 
      meterFigure.setLoLevel(35); 
      meterFigure.setLoloLevel(20); 
      meterFigure.setHiLevel(85); 
      meterFigure.setHihiLevel(70); 
      meterFigure.setMajorTickMarkStepHint(80); 

      lws.setContents(readabilityScore); 
     } 

     public void setValue(double value) { 
      this.getDisplay().asyncExec(new Runnable() { 

       @Override 
       public void run() { 
        meterFigure.setValue(value); 
       } 
      }); 
     } 
    } 

這是ListClass。

public class ListClass extends Canvas { 
     private org.eclipse.swt.widgets.List list; 
     private List<Data> dataList; 
     private GraphClass graph; 

     public ListClass(Composite parent, int style) { 
      super(parent, style); 

      list = new org.eclipse.swt.widgets.List(parent, SWT.V_SCROLL | SWT.H_SCROLL); 
      dataList = new ArrayList<Data>(); 

      ... 

      GridData gridData = new GridData(); 
      gridData.horizontalAlignment = SWT.FILL; 
      gridData.verticalAlignment = SWT.FILL; 
      list.setLayoutData(gridData); 

     } 

     .... 

     public void setGraph(GraphClass Graph) { 
      this.Graph = Graph; 
     } 

     .... 
    } 

這是GraphClass。

ublic class MatrixGraph extends Canvas { 
    private char count; 
    private XYGraph matrixGraph; 
    private LightweightSystem lws; 

    public MatrixGraph(Composite parent, int style) { 
     super(parent, style); 
     addPaintListener(new PaintListener() { 
      @Override 
      public void paintControl(org.eclipse.swt.events.PaintEvent e) { 
       MatrixGraph.this.paintControl(e); 
      } 
     }); 
    } 

    public void paintControl(PaintEvent e) { 
     if (count < 1) 
      count++; 
     else { 
      lws = new LightweightSystem(this); 

      matrixGraph = new XYGraph(); 

      setGraphProperties(); 

     } 
    } 

    ... 
} 

Answer 1

在你GridData佈局要指定：

gridData.grabExcessVerticalSpace = true; 

這是告訴佈局抓住儘可能多的垂直空間儘可能即使它可能僅僅是空白。由於您爲多個控件指定了這個值，所以額外的空間會在控件之間分配。

如果您不希望空白使用

gridData.grabExcessVerticalSpace = false; 

或只是忽略這個，因爲它是默認的。

也儘量不要使用填補垂直對齊，TOP可能會更好：

gridData.verticalAlignment = SWT.TOP;