双击编辑NSTableView列标题

Question

是否可以通过双击列标题来更改NSTableView列的名称？有关最佳方法的任何建议.

我在尝试:

1. 设置表视图的双重操作以在双击时调用自定义方法
2. 通过调用尝试编辑NSTableHeaderCell实例editWithFrame:inView:editor:delegate:event:.

我不完全确定为什么这会扭曲文本,但是当你双击标题时它会使文本看起来像这样,没有字段编辑器出现,

在AppDelegate中

-(void)awakeFromNib
{
    ...
    [_tableView setDoubleAction:@selector(doubleClickInTableView:)];
    ...
}

-(void) doubleClickInTableView:(id)sender
{
    NSInteger row = [_tableView clickedRow];
    NSInteger column = [_tableView clickedColumn];
    if(row == -1){
        /* Want to edit the column header on double-click */
        NSTableColumn *tableColumn = [[_tableView tableColumns] objectAtIndex:column];
        NSTableHeaderView *headerView = [_tableView headerView];
        NSTableHeaderCell *headerCell = [tableColumn headerCell];
        NSRect cellFrame = [headerView headerRectOfColumn:column];
        NSText * fieldEditor = [[headerView window] fieldEditor:YES forObject:nil];
        [headerCell editWithFrame:cellFrame inView:headerView editor:fieldEditor delegate:headerCell event:nil];
    }

}

Answer 1

似乎可行
你在截图中看到了什么是窗口的字段编辑器覆盖您单元的文本字段
编辑器有一个透明背景,这样就是为什么它搞砸

所以这是交易:

您将需要拥有自己的NSTableHeaderCell子类作为字段编辑器的委托:

@interface NBETableHeaderCell () <NSTextViewDelegate>
@end

@implementation NBETableHeaderCell

- (void)textDidEndEditing:(NSNotification *)notification
{
    NSTextView *editor = notification.object;
    // Update the title, kill the focus ring, end editing
    [self setTitle:editor.string];
    [self setHighlighted:NO];
    [self endEditing:editor];
}

- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView
{
    if([self isHighlighted])
    {
        [self drawFocusRingMaskWithFrame:cellFrame inView:controlView.superview];
    }

    [super drawWithFrame:cellFrame inView:controlView];
}

- (void)drawFocusRingMaskWithFrame:(NSRect)cellFrame inView:(NSView *)controlView
{
    [controlView lockFocus];
    NSSetFocusRingStyle(NSFocusRingOnly);
    [[NSBezierPath bezierPathWithRect:cellFrame] fill];
    [controlView unlockFocus];
}

@end

在app delegate的awakeFromNib中不要忘记将NSTableHeaderCell设置为Editable!

- (void)awakeFromNib
{
    NSTableColumn *newCol = [[NSTableColumn alloc] initWithIdentifier:@"whatever"];

    NBETableHeaderCell *hc = [[NBETableHeaderCell alloc] initTextCell:@"Default header text"];
    [hc setEditable:YES];
    [hc setUsesSingleLineMode:YES];
    [hc setScrollable:NO];
    [hc setLineBreakMode:NSLineBreakByTruncatingTail];
    [newCol setHeaderCell:hc];

    [self.tableView addTableColumn:newCol];
    [self.tableView setDoubleAction:@selector(doubleClickInTableView:)];
}

其余的,你
在调用selectWithFrame 后几乎就在那里,我们自定义编辑器有一个漂亮的白色不透明背景,
所以我们没有看到它下面的文本视图
和焦点环:它是单元格的工作,
我们只是设置处于突出显示状态的单元格,因此它知道现在必须绘制环

- (void)doubleClickInTableView:(id)sender
{
    NSInteger row = [_tableView clickedRow];
    NSInteger column = [_tableView clickedColumn];

    if(row == -1&& column >= 0)
    {
        NSTableColumn *tableColumn = [[_tableView tableColumns] objectAtIndex:column];
        NSTableHeaderView *headerView = [_tableView headerView];
        NBETableHeaderCell *headerCell = [tableColumn headerCell];

        // cellEditor is basically a unique NSTextView shared by the window
        // that adjusts its style to the field calling him
        // it stands above the text field's view giving the illusion that you are editing it
        // and if it has no background you will see the editor's NSTextView overlaying the TextField
        // wich is why you have that nasty bold text effect in your screenshot
        id cellEditor = [self.window fieldEditor:YES forObject:self.tableView];

        [headerCell setHighlighted:YES];
        [headerCell selectWithFrame:[headerView headerRectOfColumn:column]
                             inView:headerView
                             editor:cellEditor
                           delegate:headerCell
                              start:0
                             length:headerCell.stringValue.length];

        [cellEditor setBackgroundColor:[NSColor whiteColor]];
        [cellEditor setDrawsBackground:YES];
    }
}

有关字段编辑器的更多信息,请访问:http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/WinPanel/Tasks/UsingWindowFieldEditor.html

现在唯一缺少的就是如果在编辑时调整单元格的大小,字段编辑器的框架将不会更新...