1 files changed, 100 insertions, 0 deletions
diff --git a/Sources/Data/OwlSelection.m b/Sources/Data/OwlSelection.m
new file mode 100644
index 0000000..a69a659
--- /dev/null
+++ b/Sources/Data/OwlSelection.m
@@ -0,0 +1,100 @@
+/* This file is part of Owl.
+ *
+ * Copyright © 2019-2021 Sergey Bugaev <bugaevc@gmail.com>
+ *
+ * Owl is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Owl is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Owl.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#import "OwlSelection.h"
+#import "OwlDataSource.h"
+#import "OwlDataDevice.h"
+#import "OwlFeatures.h"
+
+
+@implementation OwlSelection
+
+- (id) init {
+    _dataDevices = [NSMutableArray new];
+    return self;
+}
+
+- (void) dealloc {
+    [_dataDevices release];
+    [_dataSource removeHolder: self];
+    [_dataSource release];
+    [super dealloc];
+}
+
++ (OwlSelection *) clipboard {
+    static OwlSelection *clipboard;
+    if (clipboard == nil) {
+        clipboard = [[OwlSelection alloc] init];
+    }
+    return clipboard;
+}
+
+#ifdef OWL_PLATFORM_GNUSTEP
++ (OwlSelection *) primary {
+    static OwlSelection *primary;
+    if (primary == nil) {
+        primary = [[OwlSelection alloc] init];
+    }
+    return primary;
+}
+#endif
+
+// Get the current data source.
+- (OwlDataSource *) dataSource {
+    return _dataSource;
+}
+
+- (void) setDataSource: (OwlDataSource *) source {
+    if (source == _dataSource) {
+        return;
+    }
+
+    // Clean up the old data source.
+    [_dataSource sendCancelled];
+    [_dataSource removeHolder: self];
+    [_dataSource release];
+
+    // Set up the new one.
+    _dataSource = [source retain];
+    [_dataSource addHolder: self];
+
+    // Broadcast it to the data devices that we have a new data source.
+    for (NSValue *value in _dataDevices) {
+        OwlDataDevice *dataDevice = [value nonretainedObjectValue];
+        [dataDevice selectionChanged: self];
+    }
+}
+
+- (void) addDataDevice: (OwlDataDevice *) dataDevice {
+    NSValue *value = [NSValue valueWithNonretainedObject: dataDevice];
+    [_dataDevices addObject: value];
+}
+
+- (void) removeDataDevice: (OwlDataDevice *) dataDevice {
+    NSValue *value = [NSValue valueWithNonretainedObject: dataDevice];
+    [_dataDevices removeObject: value];
+}
+
+- (void) releaseDataSource: (OwlDataSource *) source {
+    if (_dataSource == source) {
+       [_dataSource release];
+       _dataSource = nil;
+    }
+}
+
+@end