SWT拖动到资源管理器（Windows）或Finder（OS X） [英] SWT Drag to Explorer (Windows) or Finder (OS X)
问题描述
我不认为我可以使用 FileTransfer ，因为没有源文件。有一个源对象可以创建一个文件，但只有一旦它知道放在哪里。
下面是一个简单的例子，我正在尝试实现，有一个带有标签拖动的文本框。如果用户拖动到某个文件夹或文件，我想获取它们拖到的路径。如果他们拖到一个文件，我想用文本框中的任何内容替换该文件的内容。如果他们拖动到一个文件夹，我想创建一个名为TestFile的文件，其中包含文本框中的任何内容。
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd。*;
import org.eclipse.swt.layout。*;
import org.eclipse.swt.widgets。*;
public class DesktopDragExample {
public static void main（String [] args）{
//将SWT主循环放在一起
final显示显示= Display.getDefault（）;
display.syncExec（new Runnable（）{
@Override
public void run（）{
Shell shell = new Shell（display，SWT.SHELL_TRIM）;
initializeGui（shell）;
//打开shell
shell.open（）;
//运行事件循环
while（！shell .isDisposed（））{
if（！display.readAndDispatch（））{
display.sleep（）;
}
}
}
} ）;
}
//创建gui
private static void initializeGui（Composite parent）{
GridLayout layout = new GridLayout（2，false）;
parent.setLayout（layout）;
//指示标签
标签infoLbl =新标签（父，SWT.WRAP）;
GridData gd = new GridData（）;
gd.grabExcessHorizontalSpace = true;
gd.horizontalAlignment = SWT.FILL;
gd.horizontalSpan = 2;
infoLbl.setLayoutData（gd）;
infoLbl.setText（
你应该可以拖动到桌面，Windows资源管理器或OS X Finder.\
如果拖动到一个文件，它将用文本框的内容替换该文件的内容。\
如果拖动到一个文件夹，它将创建一个名为TestFile的文件，其内容是文本框中的任何内容。 ）;
//使文本元素
final text text = new Text（parent，SWT.SINGLE | SWT.BORDER）;
gd = new GridData（）;
gd.grabExcessHorizontalSpace = true;
gd.horizontalAlignment = SWT.FILL;
text.setLayoutData（gd）;
//使标签元素
Label label = new Label（parent，SWT.NONE）;
label.setText（拖我）;
//拖动器的监听器
DragSourceListener dragListener = new DragSourceListener（）{
@Override
public void dragStart（DragSourceEvent e）{
e.detail = DND.DROP_COPY;
}
@Override
public void dragFinished（DragSourceEvent e）{
System.out.println（ - dragFinished--）;
System.out.println（e.data =+ e.data）;
}
@Override
public void dragSetData（DragSourceEvent e）{
System.out.println（ - dragSetData--）;
System.out.println（e.data =+ e.data）;
}
};
// DragSource
DragSource dragSource = new DragSource（label，DND.DROP_COPY）;
dragSource.setTransfer（new Transfer [] {FileTransfer.getInstance（）}）;
dragSource.addDragListener（dragListener）;
}
private static void draggedTo（String path，String textBoxContents）{
System.out.println（Draged the contents+ textBoxContents +'to'+ path +'）;
}
}
这里有一些其他人同样的问题，但是至今没有解决方案：
从SWT拖到桌面， ..想要目的地路径为String
做它是通过创建一个临时文件，然后使用FileTransfer。我怀疑这是你本来必须做的本地代码。我会看看我有足够的时间来绘制样品...
I've got an SWT application with a bunch of graphical elements. I'd like for the user to be able to drag an element to their Desktop / Windows Explorer / OS X Finder. When they drop the element, I need the path that they dropped it to, so that I can create a file in that location which represents the element.
I don't think I can use a FileTransfer, because there is no source file. There is a source object which can create a file, but only once it knows where to put it.
Inlined below is a simple example of what I'm trying to achieve, there is a text box with a label to drag from. If the user drags to some folder or file, I'd like to get the path that they dragged to. If they dragged to a file, I'd like to replace the contents of that file with whatever is in the text box. If they dragged to a folder, I'd like to create a file called "TestFile" with the contents of whatever is in the text box.
import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class DesktopDragExample {
public static void main(String[] args) {
// put together the SWT main loop
final Display display = Display.getDefault();
display.syncExec(new Runnable() {
@Override
public void run() {
Shell shell = new Shell(display, SWT.SHELL_TRIM);
initializeGui(shell);
//open the shell
shell.open();
//run the event loop
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
}
});
}
// create the gui
private static void initializeGui(Composite parent) {
GridLayout layout = new GridLayout(2, false);
parent.setLayout(layout);
// make the instructions label
Label infoLbl = new Label(parent, SWT.WRAP);
GridData gd = new GridData();
gd.grabExcessHorizontalSpace = true;
gd.horizontalAlignment = SWT.FILL;
gd.horizontalSpan = 2;
infoLbl.setLayoutData(gd);
infoLbl.setText(
"You should be able to drag to the desktop, Windows Explorer, or OS X Finder.\n" +
"If you drag to a file, it will replace the contents of that file with the contents of the text box.\n" +
"If you drag to a folder, it will create a file named 'TestFile' whose contents are whatever is in the text box.");
// make the text element
final Text text = new Text(parent, SWT.SINGLE | SWT.BORDER);
gd = new GridData();
gd.grabExcessHorizontalSpace = true;
gd.horizontalAlignment = SWT.FILL;
text.setLayoutData(gd);
// make the label element
Label label = new Label(parent, SWT.NONE);
label.setText("Drag me");
// listener for drags
DragSourceListener dragListener = new DragSourceListener() {
@Override
public void dragStart(DragSourceEvent e) {
e.detail = DND.DROP_COPY;
}
@Override
public void dragFinished(DragSourceEvent e) {
System.out.println("--dragFinished--");
System.out.println("e.data=" + e.data);
}
@Override
public void dragSetData(DragSourceEvent e) {
System.out.println("--dragSetData--");
System.out.println("e.data=" + e.data);
}
};
// the DragSource
DragSource dragSource = new DragSource(label, DND.DROP_COPY);
dragSource.setTransfer(new Transfer[]{FileTransfer.getInstance()});
dragSource.addDragListener(dragListener);
}
private static void draggedTo(String path, String textBoxContents) {
System.out.println("Dragged the contents '" + textBoxContents + "' to '" + path + "'");
}
}
Here are some other people with the same problem, but looks like no solution so far: Drag from SWT to Desktop, ..want destination path as String
The only way to do it is by creating a temporary file and then using the FileTransfer. I suspect that's what you'd have to do in native code anyways. I'll see if I have enough time to sketch the sample...
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