Java Transferhandler中的getTransferData()无法按预期在jtree中删除多个对象
我试图将多行(不连续的)从jtable拖到jtree。我正在使用一个定制的可转移对象和一个定制的transferhandler 但是,我在import data方法中丢失了我的对象,因为它在java方法Java Transferhandler中的getTransferData()无法按预期在jtree中删除多个对象,java,swing,drag-and-drop,jtree,Java,Swing,Drag And Drop,Jtree,我试图将多行(不连续的)从jtable拖到jtree。我正在使用一个定制的可转移对象和一个定制的transferhandler 但是,我在import data方法中丢失了我的对象,因为它在java方法getTransferData(DataFlavor df)类DropTargetContext.java中丢失了 代码如下: public class cObjectList extends ArrayList<cObject> implements Transferable, Se
getTransferData(DataFlavor df)
类DropTargetContext.java
中丢失了
代码如下:
public class cObjectList extends ArrayList<cObject> implements Transferable, Serializable {
public static DataFlavor OBJECT_LIST_FLAVOR = new DataFlavor(cObjectList.class, "Object List");
private DataFlavor flavors[] = { OBJECT_LIST_FLAVOR };
@Override
public DataFlavor[] getTransferDataFlavors() { return flavors; }//end method getTransferDataFlavors
@Override
public boolean isDataFlavorSupported(DataFlavor flavor) {
return flavor.getRepresentationClass() == cObjectList .class; }//end method isDataFlavorSupported
@Override
public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
if (isDataFlavorSupported(flavor)) { return this; } else {
throw new UnsupportedFlavorException(flavor); }//end else
}//end method getTransferData
}//end class cObjectList
可转移对象t
正确地拥有数组列表中的对象,但是当我调用t.getTransferData
时,数组列表返回null
对象。例如,如果从表中选择了三行,这将调用cObjectList
中的getTransferData
方法,该方法正确返回arraylist中的这些对象,但当它到达DropTargetContext.java中的getTransferDat
a时,数组列表中的值返回为null
,即使列表/对象本身仍然显示size=3
为树选择的拖放模式为:
setTransferHandler(新的ObjectTreeTransferHandler());treeObjectStructure.setDropMode(DropMode.ON_或_INSERT)
有人能帮我找出我做错了什么吗?我也遇到了类似的问题,结果是DataFlavor构造函数的第一个参数必须是Object.class。如果是myclass.class,那么我也会从getTransferData返回null,它会抛出一个IOException。我不知道为什么会这样。我花了几个小时来确定这一点。我也遇到了类似的问题,结果证明DataFlavor构造函数的第一个参数必须是Object.class。如果是myclass.class,那么我也会从getTransferData返回null,它会抛出一个IOException。我不知道为什么会这样。我花了好几个小时才确定这一点。我对上面的答案投了赞成票。我也有同样的问题,我只是用莱尔说的话解决了它:
class TransferablePanel implements Transferable {
protected static DataFlavor PANELFLAVOR = new DataFlavor(Object.class, "A
JPanel Object");//instead JPanel.class I used Object.class ****
protected static DataFlavor[] supportedFlavors = { PANELFLAVOR };
JPanel panel;
public TransferablePanel(JPanel panel) {
this.panel = panel;
}
@Override
public DataFlavor[] getTransferDataFlavors() {
return supportedFlavors;
}
@Override
public boolean isDataFlavorSupported(DataFlavor flavor) {
if (flavor.equals(PANELFLAVOR))
return true;
return false;
}
@Override
public Object getTransferData(DataFlavor flavor) throws
UnsupportedFlavorException {
if (flavor.equals(PANELFLAVOR)){
return panel;
}
else
throw new UnsupportedFlavorException(flavor);
}
}
我赞成上面的答案。我也有同样的问题,我只是用莱尔说的话解决了它:
class TransferablePanel implements Transferable {
protected static DataFlavor PANELFLAVOR = new DataFlavor(Object.class, "A
JPanel Object");//instead JPanel.class I used Object.class ****
protected static DataFlavor[] supportedFlavors = { PANELFLAVOR };
JPanel panel;
public TransferablePanel(JPanel panel) {
this.panel = panel;
}
@Override
public DataFlavor[] getTransferDataFlavors() {
return supportedFlavors;
}
@Override
public boolean isDataFlavorSupported(DataFlavor flavor) {
if (flavor.equals(PANELFLAVOR))
return true;
return false;
}
@Override
public Object getTransferData(DataFlavor flavor) throws
UnsupportedFlavorException {
if (flavor.equals(PANELFLAVOR)){
return panel;
}
else
throw new UnsupportedFlavorException(flavor);
}
}
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