我如何做一个简单的基于视图的NSOutlineView？ [英] How do i make a simple view-based NSOutlineView?

问题描述

为了学习目的，我想将一个基于单元格的NSOutlineView转换为基于视图的

基本上我想要以下：

• 而不是正常单元格，我想要一个图像和文本表格单元格视图


• 是的股票NSApplicationIcon和文本可以只是'hello世界'：）


• 我想这样做而不使用绑定和 NSTreeController

以下是'worlds simplest NSOutlineView'示例http://www.cocoasteam.com/Cocoa_Steam/Worlds_Simplest_Demo.html

我想知道是否有人可以修改它基于视图和像我上面所说的工作:)）

我试过看苹果的例子，在互联网上的其他地方搜索，但我还是不能得到它工作 - 所以非常感谢提前：）

解决方案

确定，所以你想要一个 NSOutlineView c>使用 ImageAndTextCell 单元格，对吗？

让我们做一个最典型的例子

$ b

>

• NSOutlineView （将大纲写入您的AppDelegate，如 fileOutlineView ）


• 使用以下标识符（在Interface Builder中设置）在Outline中创建3列： NameColumn ， SizeColumn ， ModifiedColumn

，我会以编程方式做，所以你可以很好地了解发生了什么...

如何设置它 - （void）awakeFromNib ）：

  /设置数据源和代理
 [fileOutlineView setDataSource：（id< NSOutlineViewDataSource>）self]; 
 [fileOutlineView setDelegate：（id< NSOutlineViewDelegate>）self]; 
 
 //将第一列的单元格设置为`ImageAndTextCell`s 
 ImageAndTextCell * iatc = [[ImageAndTextCell alloc] init]; 
 [iatc setEditable：NO]; 
 [[[FileOutlineView tableColumns] objectAtIndex：0] setDataCell：iatc]; 
  

连接点：

  / ********************************* ******************** 
 * 
 * OUTLINE-VIEW DATASOURCE 
 * 
 ******* ************************************************ / 
 
  - （BOOL）outlineView：（NSOutlineView *）outlineView isItemExpandable：（id）item 
 {
 if（[item isFolder]）
 return YES; 
 else 
 return NO; 
} 
 
  - （NSInteger）outlineView：（NSOutlineView *）outlineView numberOfChildrenOfItem：（id）item 
 {
 if（item == nil）
 {
 // Root 
 return [[filePath folderContentsWithPathAndBackIgnoringHidden] count]; 
} 
 else 
 {
 if（[item isFolder]）
 {
 return [[item folderContentsWithPathAndBackIgnoringHidden] count]; 
} 
 else 
 {
 return 0; 
} 
} 
} 
 
  - （id）outlineView：（NSOutlineView *）outlineView child：（NSInteger）indexItem：（id）item 
 {
 if（item == nil）
 {
 // Root 
 return [[filePath folderContentsWithPathAndBackIgnoringHidden] objectAtIndex：index]; 
} 
 
 if（[item isFolder]）
 {
 return [[item folderContentsWithPathAndBackIgnoringHidden] objectAtIndex：index]; 
} 
 
 //文件
 return nil; 
} 
 
  - （id）outlineView：（NSOutlineView *）outlineView objectValueForTableColumn：（NSTableColumn *）theColumn byItem：（id）item 
 {
 if列表标识符] isEqualToString：@NameColumn]）
 {
 return [item lastPathComponent]; 
} 
 else if（[[theColumn identifier] isEqualToString：@SizeColumn]）
 {
 if（[item isFolder]）return @ - ; 
 else return [NSString stringWithFormat：@％d，[item getFileSize]]; 
} 
 else if（[[theColumn identifier] isEqualToString：@ModifiedColumn]）
 {
 if（[item isFolder]）return @; 
 else return [NSString stringWithFormat：@％@，[item getDateModified]]; 
} 
 
 //永远不会到达这里
 return nil; 
} 
 
 / ************************************ ******************* 
 * 
 * OUTLINE-VIEW DELEGATE 
 * 
 ******** *********************************************** / 
 
  - （BOOL）outlineView：（NSOutlineView *）outlineView shouldSelectItem：（id）item 
 {
 return YES; 
} 
 
  - （BOOL）outlineView：（NSOutlineView *）outlineView isGroupItem：（id）item 
 {
 return NO; 
} 
 
  - （void）outlineView：（NSOutlineView *）outlineView willDisplayCell：（id）cell forTableColumn：（NSTableColumn *）tableColumn item：（id）item {
 [cell setDrawsBackground：NO]; 
 
 if（[item isFileHidden]）[cell setTextColor：[NSColor grayColor]]; 
 else [cell setTextColor：[NSColor whiteColor]]; 
 
 if（[[tableColumn identifier] isEqualToString：@NameColumn]）
 {
 if（[item isFolder]）
 [cell setImage：[[NSWorkspace sharedWorkspace] iconForFileType：NSFileTypeForHFSTypeCode（kGenericFolderIcon）] size：15.0]; 
 else 
 [cell setImage：[[NSWorkspace sharedWorkspace] iconForFile：item] size：15.0]; 
 
 if（[item isFileHidden]）
 {
 [cell setFileHidden：YES]; 
} 
 else 
 {
 [cell setFileHidden：NO]; 
} 
 
} 
 
} 
  

< hr>

提示： ImageAndTextCell //developer.apple.com/library/mac/#samplecode/SourceView/Listings/ImageAndTextCell_m.html\">在这里。你还会注意到我使用的一些其他方法，显然不支持Cocoa（例如 isFileHidden ， isFolder 或 folderContentsWithPathAndBackIgnoringHidden ），但是自己实现并不难。）

For learning purposes i would like to convert a cell-based NSOutlineView to a view-based one,

basically i would like the following:

• instead of a normal cell, i'd like an 'image and text table cell view'
• the image can be the stock NSApplicationIcon and the text can just be 'hello world' :)
• I'd like to do this without using bindings and NSTreeController

Here is the 'worlds simplest NSOutlineView' example http://www.cocoasteam.com/Cocoa_Steam/Worlds_Simplest_Demo.html

I wonder if someone could modify it to make it view-based and work like i said above :) :)

I've tried looking at apple examples, and searching elsewhere on the internet but i still can't get it to work - so thanks very much in advance :)

解决方案

OK, so you want an NSOutlineView with ImageAndTextCell cells, right?

Let's do one of the most typical examples of this kind : a simple file explorer.

What we'll need :

• an NSOutlineView (put an outline to your AppDelegate, as fileOutlineView)
• create 3 columns in the Outline with the following Identifiers (set them up in Interface Builder) : NameColumn, SizeColumn, ModifiedColumn

Now, as for the rest, I'll do it all programmatically, so that you get a good idea of what's going on...

How to set it up (e.g. in - (void)awakeFromNib):

// set the Data Source and Delegate
[fileOutlineView setDataSource:(id<NSOutlineViewDataSource>)self];
[fileOutlineView setDelegate:(id<NSOutlineViewDelegate>)self];

// set the first column's cells as `ImageAndTextCell`s
ImageAndTextCell* iatc = [[ImageAndTextCell alloc] init];
[iatc setEditable:NO];
[[[fileOutlineView tableColumns] objectAtIndex:0] setDataCell:iatc];

Connecting the dots :

/*******************************************************
 *
 * OUTLINE-VIEW DATASOURCE
 *
 *******************************************************/

- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
{        
    if ([item isFolder])
        return YES;
    else
        return NO;
}

- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
{    
    if (item==nil)
    {
        // Root
        return [[filePath folderContentsWithPathAndBackIgnoringHidden] count];
    }
    else
    {        
        if ([item isFolder])
        {
            return [[item folderContentsWithPathAndBackIgnoringHidden] count];
        }
        else
        {
            return 0;
        }
    }
}

- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item
{
    if (item == nil)
    { 
        // Root
        return [[filePath folderContentsWithPathAndBackIgnoringHidden] objectAtIndex:index];
    }

    if ([item isFolder])
    {
        return [[item folderContentsWithPathAndBackIgnoringHidden] objectAtIndex:index];
    }

    // File
    return nil;
}

- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)theColumn byItem:(id)item
{          
    if ([[theColumn identifier] isEqualToString:@"NameColumn"])
    {
        return [item lastPathComponent];
    }
    else if ([[theColumn identifier] isEqualToString:@"SizeColumn"])
    {
        if ([item isFolder]) return @"--";
        else return [NSString stringWithFormat:@"%d",[item getFileSize]];
    }
    else if ([[theColumn identifier] isEqualToString:@"ModifiedColumn"])
    {
        if ([item isFolder]) return @"";
        else return [NSString stringWithFormat:@"%@",[item getDateModified]];
    }

    // Never reaches here
    return nil;
}

/*******************************************************
 *
 * OUTLINE-VIEW DELEGATE
 *
 *******************************************************/

- (BOOL)outlineView:(NSOutlineView *)outlineView shouldSelectItem:(id)item
{
    return YES;
}

- (BOOL)outlineView:(NSOutlineView *)outlineView isGroupItem:(id)item
{
    return NO;
}

- (void)outlineView:(NSOutlineView *)outlineView willDisplayCell:(id)cell forTableColumn:(NSTableColumn *)tableColumn item:(id)item {
    [cell setDrawsBackground:NO];

    if ([item isFileHidden]) [cell setTextColor:[NSColor grayColor]];
    else [cell setTextColor:[NSColor whiteColor]];

    if ([[tableColumn identifier] isEqualToString:@"NameColumn"])
    {
        if ([item isFolder])
            [cell setImage:[[NSWorkspace sharedWorkspace] iconForFileType:NSFileTypeForHFSTypeCode(kGenericFolderIcon)] size:15.0];
        else
            [cell setImage:[[NSWorkspace sharedWorkspace] iconForFile:item] size:15.0];

        if ([item isFileHidden])
        {
            [cell setFileHidden:YES];
        }
        else
        {
            [cell setFileHidden:NO];
        }

    }

}

---

Hint : ImageAndTextCell class can be found here. You'll also notice a few other methods I'm using, which are obviously NOT supported by Cocoa (e.g. isFileHidden, isFolder or folderContentsWithPathAndBackIgnoringHidden) but it's not that difficult to implement them yourself...)

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