SWT DragSource 和 DropTarget 托拉拽
SWT 托拉拽主要由3个部分组成
DragSource - 拖拉的来源封装在这个类当中
DropTarget - 粘贴的对象封装在这个类当中
Transfer - 他们之间传输的中介就靠这个
下面来看一下例子
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.action.StatusLineManager; import org.eclipse.jface.action.ToolBarManager; import org.eclipse.jface.window.ApplicationWindow; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.DragSource; import org.eclipse.swt.dnd.DragSourceEvent; import org.eclipse.swt.dnd.DragSourceListener; import org.eclipse.swt.dnd.DropTarget; import org.eclipse.swt.dnd.DropTargetEvent; import org.eclipse.swt.dnd.DropTargetListener; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; public class DragAndDrog extends ApplicationWindow { private Text dropText; private Text dragText; /** * Create the application window. */ public DragAndDrog() { super ( null ); createActions(); addToolBar(SWT.FLAT | SWT.WRAP); addMenuBar(); addStatusLine(); } /** * Create contents of the application window. * @param parent */ @Override protected Control createContents(Composite parent) { Composite container = new Composite(parent, SWT.NONE); dropText = new Text(container, SWT.BORDER); dropText.setBounds( 46 , 48 , 73 , 21 ); DropTarget target = new DropTarget(dropText,DND.DROP_MOVE); target.setTransfer( new Transfer[]{TextTransfer.getInstance()}); target.addDropListener( new DropTargetListener() { @Override public void dropAccept(DropTargetEvent event) { // TODO Auto-generated method stub } @Override public void drop(DropTargetEvent event) { // TODO Auto-generated method stub dropText.setText(String.valueOf(event.data)); } @Override public void dragOver(DropTargetEvent event) { // TODO Auto-generated method stub } @Override public void dragOperationChanged(DropTargetEvent event) { // TODO Auto-generated method stub } @Override public void dragLeave(DropTargetEvent event) { // TODO Auto-generated method stub } @Override public void dragEnter(DropTargetEvent event) { // TODO Auto-generated method stub } }); dragText = new Text(container, SWT.BORDER); dragText.setBounds( 198 , 48 , 73 , 21 ); DragSource dragSource = new DragSource(dragText, DND.DROP_MOVE); dragSource.setTransfer( new Transfer[]{TextTransfer.getInstance()}); dragSource.addDragListener( new DragSourceListener() { @Override public void dragStart(DragSourceEvent event) { // TODO Auto-generated method stub } @Override public void dragSetData(DragSourceEvent event) { event.data = dragText.getText(); } @Override public void dragFinished(DragSourceEvent event) { // TODO Auto-generated method stub } }); return container; } /** * Create the actions. */ private void createActions() { // Create the actions } /** * Create the menu manager. * @return the menu manager */ @Override protected MenuManager createMenuManager() { MenuManager menuManager = new MenuManager( "menu" ); return menuManager; } /** * Create the toolbar manager. * @return the toolbar manager */ @Override protected ToolBarManager createToolBarManager( int style) { ToolBarManager toolBarManager = new ToolBarManager(style); return toolBarManager; } /** * Create the status line manager. * @return the status line manager */ @Override protected StatusLineManager createStatusLineManager() { StatusLineManager statusLineManager = new StatusLineManager(); return statusLineManager; } /** * Launch the application. * @param args */ public static void main(String args[]) { try { DragAndDrog window = new DragAndDrog(); window.setBlockOnOpen( true ); window.open(); Display.getCurrent().dispose(); } catch (Exception e) { e.printStackTrace(); } } /** * Configure the shell. * @param newShell */ @Override protected void configureShell(Shell newShell) { super .configureShell(newShell); newShell.setText( "New Application" ); } /** * Return the initial size of the window. */ @Override protected Point getInitialSize() { return new Point( 450 , 300 ); } } |
在上面的代码中,主要的是,必须为DragSource添加一个监听,否则会报一下的错
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | org.eclipse.swt.SWTException: Data does not have correct format for type at org.eclipse.swt.dnd.DND.error(DND.java: 276 ) at org.eclipse.swt.dnd.DND.error(DND.java: 227 ) at org.eclipse.swt.dnd.TextTransfer.javaToNative(TextTransfer.java: 67 ) at org.eclipse.swt.dnd.DragSource.GetData(DragSource.java: 472 ) at org.eclipse.swt.dnd.DragSource.access$ 7 (DragSource.java: 436 ) at org.eclipse.swt.dnd.DragSource$ 4 .method3(DragSource.java: 259 ) at org.eclipse.swt.internal.ole.win32.COMObject.callback3(COMObject.java: 92 ) at org.eclipse.swt.internal.ole.win32.COM.VtblCall(Native Method) at org.eclipse.swt.internal.ole.win32.IDataObject.GetData(IDataObject.java: 25 ) at org.eclipse.swt.dnd.Transfer.getData(Transfer.java: 44 ) at org.eclipse.swt.dnd.TextTransfer.nativeToJava(TextTransfer.java: 127 ) at org.eclipse.swt.dnd.DropTarget.Drop(DropTarget.java: 443 ) at org.eclipse.swt.dnd.DropTarget$ 3 .method6(DropTarget.java: 258 ) at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java: 119 ) at org.eclipse.swt.internal.ole.win32.COM.DoDragDrop(Native Method) at org.eclipse.swt.dnd.DragSource.drag(DragSource.java: 363 ) at org.eclipse.swt.dnd.DragSource.access$ 0 (DragSource.java: 289 ) at org.eclipse.swt.dnd.DragSource$ 1 .handleEvent(DragSource.java: 172 ) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java: 84 ) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java: 1053 ) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java: 4169 ) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java: 3758 ) at org.eclipse.jface.window.Window.runEventLoop(Window.java: 825 ) at org.eclipse.jface.window.Window.open(Window.java: 801 ) at cccccc.DragAndDrog.main(DragAndDrog.java: 165 ) |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | dragSource.addDragListener( new DragSourceListener() { @Override public void dragStart(DragSourceEvent event) { // TODO Auto-generated method stub } @Override public void dragSetData(DragSourceEvent event) { event.data = dragText.getText(); } @Override public void dragFinished(DragSourceEvent event) { // TODO Auto-generated method stub } }); |
【推荐】编程新体验,更懂你的AI,立即体验豆包MarsCode编程助手
【推荐】凌霞软件回馈社区,博客园 & 1Panel & Halo 联合会员上线
【推荐】抖音旗下AI助手豆包,你的智能百科全书,全免费不限次数
【推荐】轻量又高性能的 SSH 工具 IShell:AI 加持,快人一步