从NSOutlineView中削减几个级别的缩进 [英] Shaving a couple levels of indentation off of an NSOutlineView

问题描述

我有一个大纲视图，其中我不想缩进顶部几个水​​平（他们有一个独特的外观反正），但我做想缩进后续水平。

I have an outline view where I don't want to indent the top couple levels (they have a distinctive appearance anyway), but I do want to indent subsequent levels. How can I do this?

我尝试覆盖 -levelForRow：和 levelForItem：从返回值中减去2，但这没有帮助。我也尝试重写 -frameOfOutlineCellAtRow：从框架的宽度减去2 * indentationPerLevel，但是没有帮助，可能是因为我不显示公开三角形。关于我如何解决这个问题的任何想法？

I've tried overriding -levelForRow: and -levelForItem: to subtract 2 from the return values, but this didn't help. I also tried overriding -frameOfOutlineCellAtRow: to subtract 2 * indentationPerLevel from the frame's width, but that didn't help either, possibly because I'm not showing disclosure triangles. Any thoughts about how I can fix this issue?

大纲视图绑定到 NSTreeController 难以平整底层数据结构，但我确实有一个大纲视图委托设置。

The outline view is bound to an NSTreeController, which makes it difficult to flatten the underlying data structure, but I do have an outline view delegate set up.

推荐答案

解决方案是使用 frameOfCellAtColumn：row：这是一个 NSTableView 方法。

The solution is to use frameOfCellAtColumn:row: which is an NSTableView method.

- (NSRect)frameOfCellAtColumn:(NSInteger)column row:(NSInteger)row;
{
    NSRect frame = [super frameOfCellAtColumn:column row:row];

    if (column == (NSInteger)[self.tableColumns indexOfObjectIdenticalTo:self.outlineTableColumn]) {
        if (this-item-or-row-matches-your-conditions) {
            frame.origin.x -= self.indentationPerLevel;
            frame.size.width += self.indentationPerLevel;
        }
    }

    return frame;
}

此方法控制基于单元格和基于视图的表视图和大纲视图。

This method controls the layout in both cell-based and view-based table views and outline views.

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