基于视图的NSTableView选择突出显示 [英] View based NSTableView selection highlighting

问题描述

我正在尝试将iOS应用程序移植到Mac上，在过渡期间遇到了两个问题.其中之一是NSTableView的自定义. NSCell，NSTableRowView和基于自定义NSView的NSTableview之间到底有什么区别?我最初从基于NSTableView的视图开始，但是很快我注意到我必须自己处理选择.我无法做到这一点，所以我继续使用NSTableRowView，奇怪的是，它没有调用自定义NSTableRowView的初始化程序.

I am trying to port an iOS application onto the Mac and I came across a couple of issues during the transition. One of them is the customization of NSTableView. What exactly is the difference between NSCell, NSTableRowView and custom NSView based NSTableview ? I initially started out with a view based NSTableView, but I soon noticed that I would have to handle the selection myself. I could not pull that off, so I went on to use NSTableRowView, which, strangely, does not call the initialiser of my custom NSTableRowView.

我基本上只是想要一个带有自定义内容的自定义表格视图单元格，该单元格是可选的.最好的方法是什么?

I basically just want a custom table view cell with custom contents, which is selectable. What is the best way to do it ?

在iOS上，我只是将UITableViewCell子类化并设置其selectedView属性.在Mac上，这似乎要复杂得多.

On iOS, I would just subclass UITableViewCell and set its selectedView property. On Mac this seems to be more complicated than that.

推荐答案

我实际上刚刚发现(在边栏中)这个问题，建议将NSTableRowView子类化.我之前已经做过，但是没有用.我已经再次尝试过，并且非常令人惊讶的是它现在可以工作了……

I have actually just found (in the sidebar) this question, which advises to subclass NSTableRowView. I had already done that before, but it did not work. I have tried it again and quite surprisingly it works now...

在基于视图的NSTableView中处理自定义选择样式

但是，此答案不是很有帮助，因此我将尝试涵盖为完成这项工作而所做的工作.

However, this answer is not very informative, so I will try to cover what I have done in order to make this work.

首先，我实现了以下NSTableView委托方法，并返回nil！:

First of all, I implemented the following NSTableView delegate method and return nil!:

- (NSView *)tableView:(NSTableView *)tableView viewForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row{

    return nil;

}

为了使用基于视图的表(我想NSTableViewRow也被认为是基于视图的表...)，您必须实现此方法.我不太确定自己做错了什么，但是如果没有这种方法，我的单元格将不会显示！

In order to use a view based (I guess NSTableViewRow is regarded a view based table as well...) table you HAVE TO implement this method. I am not quite sure what I might have done wrong, but without this method, my cells are not displayed!

通过设置以下属性，确保不让NSTableView处理任何选择:

Make sure to not let the NSTableView handle any selection by setting this property:

yourNSTableView.selectionHighlightStyle = NSTableViewSelectionHighlightStyleNone;

好的，现在我们要使用以下委托方法设置单元:

Okay, so now we want to set up our cells with the following delegate method:

-(NSTableRowView *)tableView:(NSTableView *)tableView rowViewForRow:(NSInteger)row{

    static NSString *cellID = @"cell_identifier";

    //use this if you want to reuse the cells
    CustomTableRowView *result = [tableView makeViewWithIdentifier:cellID owner:self];

    if (result == nil) {

        result = [[CustomTableRowView alloc] initWithFrame:NSMakeRect(0, 0, self.frame.size.width, 80)];
        result.identifier = cellID;

    }

    result.data = [tableData objectAtIndex:row];

    // Return the result
    return result;

}

好的，现在子类NSTableRowView并实现/重写以下两个方法:

Okay so now subclass NSTableRowView and implement/override the following two methods:

首先，我们必须重写setSelected:，以使单元格在被选择时重绘其背景.所以这里是:

First we have to override setSelected: in order to make the cell redraw its background when it is selected. So here it is:

-(void)setSelected:(BOOL)selected{

    [super setSelected:selected];
    [self setNeedsDisplay:YES];

}

如前所述，我们调用setNeedsDisplay:以便单元格重绘其背景.

As mentioned earlier, we call setNeedsDisplay: in order for the cell to redraw its background.

最后，绘制代码.像这样覆盖方法drawBackgroundInRect::

Finally, the drawing code. Override the method drawBackgroundInRect: like this:

-(void)drawBackgroundInRect:(NSRect)dirtyRect{
    if (!self.selected) {
        [[NSColor clearColor] set];
    } else {
        [someColor set];
    }
    NSRectFill(dirtyRect);
}

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