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initial prototype of drag reorder complete, can drag elements in spec…
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140 changes: 140 additions & 0 deletions
140
gentest/src/miniventure/gentest/util/ListItemTransferHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| package miniventure.gentest.util; | ||
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| import javax.swing.DefaultListModel; | ||
| import javax.swing.JComponent; | ||
| import javax.swing.JList; | ||
| import javax.swing.TransferHandler; | ||
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| import java.awt.Component; | ||
| import java.awt.datatransfer.DataFlavor; | ||
| import java.awt.datatransfer.Transferable; | ||
| import java.awt.datatransfer.UnsupportedFlavorException; | ||
| import java.awt.dnd.DragSource; | ||
| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Objects; | ||
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| @SuppressWarnings("serial") | ||
| class ListItemTransferHandler extends TransferHandler { | ||
| protected final DataFlavor localObjectFlavor; | ||
| protected int[] indices; | ||
| protected int addIndex = -1; // Location where items were added | ||
| protected int addCount; // Number of items added. | ||
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| @FunctionalInterface | ||
| public interface TransferListener { | ||
| void orderChanged(); | ||
| } | ||
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| private final ArrayList<TransferListener> listeners = new ArrayList<>(); | ||
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| public ListItemTransferHandler() { | ||
| super(); | ||
| // localObjectFlavor = new ActivationDataFlavor( | ||
| // Object[].class, DataFlavor.javaJVMLocalObjectMimeType, "Array of items"); | ||
| localObjectFlavor = new DataFlavor(Object.class, "single item"); | ||
| } | ||
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| public void addTransferListener(TransferListener l) { listeners.add(l); } | ||
| public void removeTransferListener(TransferListener l) { listeners.remove(l); } | ||
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| @Override | ||
| protected Transferable createTransferable(JComponent c) { | ||
| JList<?> source = (JList<?>) c; | ||
| c.getRootPane().getGlassPane().setVisible(true); | ||
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| indices = new int[] {source.getSelectedIndex()}; | ||
| Object selectedValue = source.getSelectedValue(); | ||
| // return new DataHandler(transferedObjects, localObjectFlavor.getMimeType()); | ||
| return new Transferable() { | ||
| @Override public DataFlavor[] getTransferDataFlavors() { | ||
| return new DataFlavor[] {localObjectFlavor}; | ||
| } | ||
| @Override public boolean isDataFlavorSupported(DataFlavor flavor) { | ||
| return Objects.equals(localObjectFlavor, flavor); | ||
| } | ||
| @Override public Object getTransferData(DataFlavor flavor) | ||
| throws UnsupportedFlavorException, IOException { | ||
| if (isDataFlavorSupported(flavor)) { | ||
| return selectedValue; | ||
| } else { | ||
| throw new UnsupportedFlavorException(flavor); | ||
| } | ||
| } | ||
| }; | ||
| } | ||
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| @Override | ||
| public boolean canImport(TransferSupport info) { | ||
| return info.isDrop() && info.isDataFlavorSupported(localObjectFlavor); | ||
| } | ||
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| @Override | ||
| public int getSourceActions(JComponent c) { | ||
| Component glassPane = c.getRootPane().getGlassPane(); | ||
| glassPane.setCursor(DragSource.DefaultMoveDrop); | ||
| return MOVE; // COPY_OR_MOVE; | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| @Override | ||
| public boolean importData(TransferSupport info) { | ||
| DropLocation tdl = info.getDropLocation(); | ||
| if (!canImport(info) || !(tdl instanceof JList.DropLocation)) { | ||
| return false; | ||
| } | ||
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| JList.DropLocation dl = (JList.DropLocation) tdl; | ||
| JList target = (JList) info.getComponent(); | ||
| DefaultListModel listModel = (DefaultListModel) target.getModel(); | ||
| int max = listModel.getSize(); | ||
| int index = dl.getIndex(); | ||
| index = index < 0 ? max : index; // If it is out of range, it is appended to the end | ||
| index = Math.min(index, max); | ||
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| addIndex = index; | ||
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| try { | ||
| Object value = info.getTransferable().getTransferData(localObjectFlavor); | ||
| listModel.add(index, value); | ||
| target.addSelectionInterval(index, index); | ||
| addCount = 1; | ||
| return true; | ||
| } catch (UnsupportedFlavorException | IOException ex) { | ||
| ex.printStackTrace(); | ||
| } | ||
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| return false; | ||
| } | ||
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| @Override | ||
| protected void exportDone(JComponent c, Transferable data, int action) { | ||
| c.getRootPane().getGlassPane().setVisible(false); | ||
| cleanup(c, action == MOVE); | ||
| } | ||
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| private void cleanup(JComponent c, boolean remove) { | ||
| if (remove && Objects.nonNull(indices)) { | ||
| if (addCount > 0) { | ||
| // https://github.com/aterai/java-swing-tips/blob/master/DragSelectDropReordering/src/java/example/MainPanel.java | ||
| for (int i = 0; i < indices.length; i++) { | ||
| if (indices[i] >= addIndex) { | ||
| indices[i] += addCount; | ||
| } | ||
| } | ||
| } | ||
| JList source = (JList) c; | ||
| DefaultListModel model = (DefaultListModel) source.getModel(); | ||
| for (int i = indices.length - 1; i >= 0; i--) { | ||
| model.remove(indices[i]); | ||
| } | ||
| } | ||
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| indices = null; | ||
| addCount = 0; | ||
| addIndex = -1; | ||
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| for(TransferListener l: listeners) | ||
| l.orderChanged(); | ||
| } | ||
| } |
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