objective-c - NSOutlineView : how to make parent items bold?

Question

我有一个 NSOutlineView，其中包含父项目和子项目的列表。

将父项(带有开始箭头的项)设置为粗体文本的最简单方法是什么？

谢谢

Answer 1

如果您使用基于单元格的大纲 View ，则可以使用此委托(delegate)方法将父项加粗:

// Assuming you use NSTextFieldCell
- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item {
    if ([self outlineView:outlineView numberOfChildrenOfItem:item] > 0) {
        [(NSCell *)cell setFont: [NSFont boldSystemFontOfSize: ((NSCell *)cell).font.pointSize]];
    } else {
        [(NSCell *)cell setFont: [NSFont systemFontOfSize: ((NSCell *)cell).font.pointSize]];
    }
}

否则，在基于 View 的大纲 View 中，您可以执行以下操作:

- (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item {
    NSTableCellView *cellView = [outlineView makeViewWithIdentifier:@"MyIdentifier" owner:self];
    if ([self outlineView:outlineView numberOfChildrenOfItem:item] > 0) {
        [cellView.textField setFont: [NSFont boldSystemFontOfSize: cellView.textField.font.pointSize]];
    } else {
        [cellView.textField setFont: [NSFont systemFontOfSize: cellView.textField.font.pointSize]];
    }

    // do whatever else you do
    return cellView;
}

或者，NSOutlineViewDelegate 的 -outlineView:isGroupItem: 可能就是您真正要寻找的:https://developer.apple.com/library/mac/documentation/cocoa/reference/NSOutlineViewDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/NSOutlineViewDelegate/outlineView:isGroupItem :