Port macOS client to C++ (#1830)

* Rename all .m (Obj-C) files to .mm (Obj-C++)

* Fix build in Obj-C++ mode

* Fix Xcode build

macosx/FileOutlineView.mm

@@ -0,0 +1,135 @@
+/******************************************************************************
+ * Copyright (c) 2007-2012 Transmission authors and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *****************************************************************************/
+
+#import "InfoWindowController.h"
+#import "FileListNode.h"
+#import "FileNameCell.h"
+#import "FileOutlineView.h"
+#import "FilePriorityCell.h"
+#import "Torrent.h"
+
+@implementation FileOutlineView
+
+- (void)awakeFromNib
+{
+    FileNameCell* nameCell = [[FileNameCell alloc] init];
+    [self tableColumnWithIdentifier:@"Name"].dataCell = nameCell;
+
+    FilePriorityCell* priorityCell = [[FilePriorityCell alloc] init];
+    [self tableColumnWithIdentifier:@"Priority"].dataCell = priorityCell;
+
+    self.autoresizesOutlineColumn = NO;
+    self.indentationPerLevel = 14.0;
+
+    fMouseRow = -1;
+}
+
+- (void)mouseDown:(NSEvent*)event
+{
+    [self.window makeKeyWindow];
+    [super mouseDown:event];
+}
+
+- (NSMenu*)menuForEvent:(NSEvent*)event
+{
+    NSInteger const row = [self rowAtPoint:[self convertPoint:event.locationInWindow fromView:nil]];
+
+    if (row >= 0)
+    {
+        if (![self isRowSelected:row])
+        {
+            [self selectRowIndexes:[NSIndexSet indexSetWithIndex:row] byExtendingSelection:NO];
+        }
+    }
+    else
+    {
+        [self deselectAll:self];
+    }
+
+    return self.menu;
+}
+
+- (NSRect)iconRectForRow:(int)row
+{
+    FileNameCell* cell = (FileNameCell*)[self preparedCellAtColumn:[self columnWithIdentifier:@"Name"] row:row];
+    NSRect iconRect = [cell imageRectForBounds:[self rectOfRow:row]];
+
+    iconRect.origin.x += self.indentationPerLevel * (CGFloat)([self levelForRow:row] + 1);
+    return iconRect;
+}
+
+- (void)updateTrackingAreas
+{
+    [super updateTrackingAreas];
+
+    for (NSTrackingArea* area in self.trackingAreas)
+    {
+        if (area.owner == self && area.userInfo[@"Row"])
+        {
+            [self removeTrackingArea:area];
+        }
+    }
+
+    NSRange visibleRows = [self rowsInRect:self.visibleRect];
+    if (visibleRows.length == 0)
+    {
+        return;
+    }
+
+    NSPoint mouseLocation = [self convertPoint:self.window.mouseLocationOutsideOfEventStream fromView:nil];
+
+    for (NSInteger row = visibleRows.location, col = [self columnWithIdentifier:@"Priority"]; (NSUInteger)row < NSMaxRange(visibleRows); row++)
+    {
+        FilePriorityCell* cell = (FilePriorityCell*)[self preparedCellAtColumn:col row:row];
+
+        NSDictionary* userInfo = @{ @"Row" : @(row) };
+        [cell addTrackingAreasForView:self inRect:[self frameOfCellAtColumn:col row:row] withUserInfo:userInfo
+                        mouseLocation:mouseLocation];
+    }
+}
+
+- (NSInteger)hoveredRow
+{
+    return fMouseRow;
+}
+
+- (void)mouseEntered:(NSEvent*)event
+{
+    NSNumber* row;
+    if ((row = ((NSDictionary*)event.userData)[@"Row"]))
+    {
+        fMouseRow = row.intValue;
+        [self setNeedsDisplayInRect:[self frameOfCellAtColumn:[self columnWithIdentifier:@"Priority"] row:fMouseRow]];
+    }
+}
+
+- (void)mouseExited:(NSEvent*)event
+{
+    NSNumber* row;
+    if ((row = ((NSDictionary*)event.userData)[@"Row"]))
+    {
+        [self setNeedsDisplayInRect:[self frameOfCellAtColumn:[self columnWithIdentifier:@"Priority"] row:row.intValue]];
+        fMouseRow = -1;
+    }
+}
+
+@end