need help on stateImageManager

Hi...

currentl yI am stuck teaching my tree view to use a different icon when
selected. I already managed to use my own icon for display, but it still
does not change.
here is what I did:
First, I have overridden onViewAvailable in MyShell presenter to set the
appropriate ImageManagers:

MyShell>>onViewAvailable
    super onViewAvailable.
    ((self presenterNamed: 'projectTree') view)
        imageManager: self imageManager;
        stateImageManager: self stateImageManager.
    ((self presenterNamed: 'fileList') view)
        imageManager: self imageManager;
        stateImageManager: self stateImageManager

The imageManager and stateImageManager objects I have checked with an
inspect on
imageManager imageAt: 1 and stateImageManager imageAt: 1
They return different images.

The getImageBlock: property of the 'projectTree' view is [ : item | 1].

Now, the 1st icon of imageManager is always shown, regardless whether a tree
item is seleced or not.

Unfortunately I found no docu on stateImageManager, but I thought its
purpose is probably to show different icons when items get selected?!

Thanks for any help!

Ciao

...Jochen

fixed the problem with an getImageBlock that compares the node against the
current selection.

Still, I wonder what the stateImageManager is good for?! Any idea?

Ciao

...Jochen

Jochen,

> Still, I wonder what the stateImageManager is good for?! Any idea?

I had a mooch around MSDN and found the following which _sort_ of explains
it.  Can't say I've ever used them though.

Regards
    Ian

Tree-View Image Lists
Each item in a tree-view control can have four bitmapped images associated
with it.

  a.. An image, such as an open folder, displayed when the item is selected.
  b.. An image, such as a closed folder, displayed when the item is not
selected.
  c.. An overlay image that is drawn transparently over the selected or
nonselected image.
  d.. A state image, which is an additional image displayed to the left of
the selected or nonselected image. You can use state images, such as checked
and cleared check boxes, to indicate application-defined item states.
By default, a tree-view control does not display item images. To display
item images, you must create image lists and associate them with the
control. For more information about image lists, see Image Lists.

A tree-view control can have two image lists: a normal image list and a
state image list. A normal image list stores the selected, nonselected, and
overlay images. A state image list stores state images. Use the
ImageList_Create function to create an image list, and use other image list
functions to add bitmaps to the image list. Then, to associate the image
list with the tree-view control, use the TVM_SETIMAGELIST message. The
TVM_GETIMAGELIST message retrieves a handle to one of a tree-view control's
image lists. This message is useful if you need to add more images to the
list.

In addition to the selected and nonselected images, a tree-view control's
normal image list can contain up to four overlay images. Overlay images are
identified by a one-based index and are designed to be drawn transparently
over the selected and nonselected images. To assign an overlay mask index to
an image in the normal image list, call the ImageList_SetOverlayImage
function.

By default, all items display the first image in the normal image list for
both the selected and nonselected states. Also, by default, items do not
display overlay images or state images. You can change these default
behaviors for an item by sending the TVM_INSERTITEM or TVM_SETITEM message.
These messages use the TVITEM structure to specify image list indexes for an
item.

To specify an item's selected and nonselected images, set the
TVIF_SELECTEDIMAGE and TVIF_IMAGE bits in the mask member of the TVITEM
structure and specify indexes from the control's normal image list in the
iSelectImage and iImage members. Alternatively, you can specify the
I_IMAGECALLBACK value in iSelectImage and iImage instead of specifying
indexes. This causes the control to query its parent window for an image
list index each time the item is about to be redrawn. The control sends the
TVN_GETDISPINFO notification message to retrieve the index.

To associate an overlay image with an item, use the INDEXTOOVERLAYMASK macro
to specify an overlay mask index in the state member of the item's TVITEM
structure. You must also set the TVIS_OVERLAYMASK bits in the stateMask
member. Overlay mask indexes are one-based; an index of zero indicates that
no overlay image was specified.

State images are stored in a separate state image list and identified by
their index. To specify the state image list, send a TVM_SETIMAGELIST
message. Unlike the list-view control, which uses a one-based index to
identify state images, tree-view control state images are identified by a
zero-based index. However, an index of zero indicates that the item does not
have a state image. Consequently, image zero cannot be used as a state
image. For further discussion of item states and state images, see Tree-View
Item States Overview