带NSTableView的箭头键 [英] Arrow keys with NSTableView

问题描述

是否可以使用箭头键导航NSTableView的NSTableView周围的可编辑单元格，并输入/ tab？例如，我想让它感觉更像一个电子表格。

Is it possible to navigate an NSTableView's editable cell around the NSTableView using arrow keys and enter/tab? For example, I want to make it feel more like a spreadsheet.

这个应用程序的用户需要编辑相当多的单元格（但不是所有的）

The users of this application are expected to edit quite a lot of cells (but not all of them), and I think it would be easier to do so if they didn't have to double-click on each cell.

推荐答案

如果不需要双击每个单元格，这样做会更容易。这不容易，但我设法做到，而不必使用RRSpreadSheet或甚至另一个控件。这里是你必须做的：

Well it isn't easy but I managed to do it without having to use RRSpreadSheet or even another control. Here's what you have to do:

1. 创建 NSTextView ，这将是字段编辑器。对于这个例子，将使用名称 MyFieldEditorClass ， myFieldEditor 将引用此类的实例。

1. Create a subclass of NSTextView, this will be the field editor. For this example the name MyFieldEditorClass will be used and myFieldEditor will refer to an instance of this class.

添加方法到 MyFieldEditorClass 调用 - （void）setLastKnownColumn：（unsigned）aCol

Add a method to MyFieldEditorClass called "- (void) setLastKnownColumn:(unsigned)aCol andRow:(unsigned) aRow" or something similar, and have it save both the input parameter values somewhere.

添加另一个方法称为setTableView：，并将NSTableView对象保存在某个地方，或者除非有其他方法从字段编辑器获取NSTableView对象。

Add another method called "setTableView:" and have it save the NSTableView object somewhere, or unless there is another way to get the NSTableView object from the field editor, use that.

添加另一个名为 - （void）keyDown：（NSEvent *）event 的方法。这实际上覆盖了 NSResponder 的 keyDown：。源代码应该是（注意StackOverflow的MarkDown正在改变< 和> 到& lt; 和& gt; ）：

Add another method called - (void) keyDown:(NSEvent *) event. This is actually overriding the NSResponder's keyDown:. The source code should be (be aware that StackOverflow's MarkDown is changing < and > to < and >):

- (void) keyDown:(NSEvent *) event
{
    unsigned newRow = row, newCol = column;
    switch ([event keyCode])
    {
        case 126: // Up
            if (row)
            newRow = row - 1;
            break;

        case 125: // Down
            if (row < [theTable numberOfRows] - 1)
                newRow = row + 1;
            break;

        case 123: // Left
            if (column > 1)
                newCol = column - 1;
            break;

        case 124: // Right
            if (column < [theTable numberOfColumns] - 1)
                newCol = column + 1;
            break;

        default:
            [super keyDown:event];
            return;
    }

    [theTable selectRow:newRow byExtendingSelection:NO];
    [theTable editColumn:newCol row:newRow withEvent:nil select:YES];
    row = newRow;
    column = newCol;
}

在您的nib中授予NSTableView一个委托，添加方法：

Give the NSTableView in your nib a delegate, and in the delegate add the method:

- (BOOL) tableView:(NSTableView *)aTableView shouldEditColumn:(NSTableColumn *) aCol row:aRow
{
    if ([aTableView isEqual:TheTableViewYouWantToChangeBehaviour])
        [myFieldEditor setLastKnownColumn:[[aTableView tableColumns] indexOfObject:aCol] andRow:aRow];
    return YES;
}

最后，给Table View的主窗口一个委托，方法：

Finally, give the Table View's main window a delegate and add the method:

- (id) windowWillReturnFieldEditor:(NSWindow *) aWindow toObject:(id) anObject
{
    if ([anObject isEqual:TheTableViewYouWantToChangeBehaviour])
    {
        if (!myFieldEditor)
        {
            myFieldEditor = [[MyFieldEditorClass alloc] init];
            [myFieldEditor setTableView:anObject];
        }
        return myFieldEditor;
    }
    else
    {
        return nil;
    }
}

运行程序，并给它一个去！

Run the program and give it a go!

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