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package org.eclipse.swt.dnd;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved
*/
import org.eclipse.swt.*;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.gtk.GtkSelectionData;
import org.eclipse.swt.internal.gtk.GtkTargetEntry;
import org.eclipse.swt.internal.gtk.OS;
import org.eclipse.swt.widgets.*;
/**
* IMPORTANT: This class is <em>not</em> intended to be subclassed.
*/
public class Clipboard {
Display display;
Callback getFunc;
Callback clearFunc;
int pGtkClipboard;
/* Data is not flushed to the clipboard immediately.
* This class will remember the data and provide it when requested. */
Object[] data;
Transfer[] dataTypes;
public Clipboard(Display display) {
checkSubclass ();
if (display == null) {
display = Display.getCurrent();
if (display == null) {
display = Display.getDefault();
}
}
if (display.getThread() != Thread.currentThread()) {
SWT.error(SWT.ERROR_THREAD_INVALID_ACCESS);
}
this.display = display;
getFunc = new Callback( this, "getFunc", 4);
clearFunc = new Callback( this, "clearFunc", 2);
pGtkClipboard = OS.gtk_clipboard_get(OS.GDK_NONE);
}
int clearFunc(int clipboard,int user_data_or_owner){
data = null;
dataTypes = null;
return 1;
}
protected void checkSubclass () {
String name = getClass().getName ();
String validName = Clipboard.class.getName();
if (!validName.equals(name)) {
DND.error (SWT.ERROR_INVALID_SUBCLASS);
}
}
public void dispose () {
if (pGtkClipboard == 0) return;
if (data != null) OS.gtk_clipboard_clear(pGtkClipboard);
OS.g_free(pGtkClipboard);
pGtkClipboard = 0;
display = null;
if (getFunc != null ) getFunc.dispose();
getFunc = null;
if (clearFunc != null) clearFunc.dispose();
clearFunc = null;
}
public Object getContents(Transfer transfer) {
if (transfer == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
int selection_data = 0;
int[] typeIds = transfer.getTypeIds();
for (int i = 0; i < typeIds.length; i++) {
selection_data = OS.gtk_clipboard_wait_for_contents(pGtkClipboard, typeIds[i]);
if( selection_data != 0) break;
};
if (selection_data == 0) return null; // No data available for this transfer
GtkSelectionData gtkSelectionData = new GtkSelectionData();
OS.memmove(gtkSelectionData, selection_data, GtkSelectionData.sizeof);
TransferData tdata = new TransferData();
tdata.type = gtkSelectionData.target;
tdata.pValue = gtkSelectionData.data;
tdata.length = gtkSelectionData.length;
tdata.format = gtkSelectionData.format;
Object result = transfer.nativeToJava(tdata);
OS.gtk_selection_data_free(selection_data);
return result;
}
/**
* This function provides the data to the clipboard on request.
* When this clipboard is disposed, the data will no longer be available.
*/
int getFunc( int clipboard, int selection_data, int info, int user_data_or_owner){
if (selection_data == 0) return 0;
GtkSelectionData selectionData = new GtkSelectionData();
OS.memmove(selectionData, selection_data, GtkSelectionData.sizeof);
TransferData tdata = new TransferData();
tdata.type = selectionData.target;
int index = -1;
for (int i = 0; i < dataTypes.length; i++) {
if (dataTypes[i].isSupportedType(tdata)) {
index = i;
break;
}
}
if (index == -1) return 0;
dataTypes[index].javaToNative(data[index], tdata);
OS.gtk_selection_data_set(selection_data, tdata.type, tdata.format, tdata.pValue, tdata.length);
return 1;
}
public void setContents(Object[] data, Transfer[] dataTypes){
if (data == null || dataTypes == null || data.length != dataTypes.length) {
DND.error(SWT.ERROR_INVALID_ARGUMENT);
}
if (display.isDisposed() ) DND.error(DND.ERROR_CANNOT_SET_CLIPBOARD);
if (dataTypes.length == 0) return;
if (this.data != null) {
OS.gtk_clipboard_clear(pGtkClipboard);
}
GtkTargetEntry[] entries = new GtkTargetEntry [0];
for (int i = 0; i < dataTypes.length; i++) {
Transfer transfer = dataTypes[i];
int[] typeIds = transfer.getTypeIds();
String[] typeNames = transfer.getTypeNames();
for (int j = 0; j < typeIds.length; j++) {
GtkTargetEntry entry = new GtkTargetEntry();
entry.info = typeIds[j];
byte[] buffer = Converter.wcsToMbcs(null, typeNames[j], true);
int pName = OS.g_malloc(buffer.length);
OS.memmove(pName, buffer, buffer.length);
entry.target = pName;
GtkTargetEntry[] tmp = new GtkTargetEntry [entries.length + 1];
System.arraycopy(entries, 0, tmp, 0, entries.length);
tmp[entries.length] = entry;
entries = tmp;
}
}
int pTargetsList = OS.g_malloc(GtkTargetEntry.sizeof * entries.length);
int offset = 0;
for (int i = 0; i < entries.length; i++) {
OS.memmove(pTargetsList + offset, entries[i], GtkTargetEntry.sizeof);
offset += GtkTargetEntry.sizeof;
}
this.data = data;
this.dataTypes = dataTypes;
boolean result = OS.gtk_clipboard_set_with_data(pGtkClipboard, pTargetsList, entries.length, getFunc.getAddress(), clearFunc.getAddress(), 0);
for (int i = 0; i < entries.length; i++) {
GtkTargetEntry entry = entries[i];
if( entry.target != 0) OS.g_free(entry.target);
}
if (pTargetsList != 0) OS.g_free(pTargetsList);
if (!result) DND.error(DND.ERROR_CANNOT_SET_CLIPBOARD);
}
/*
* Note: getAvailableTypeNames is a tool for writing a Transfer sub-class only. It should
* NOT be used within an application because it provides platform specfic
* information.
*/
public String[] getAvailableTypeNames() {
return new String[0];
}
}
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