CodeGuru Staff

In the previous section, we defined an overloaded version of GetNextItem() which returns the next item in the outline as if the outline were completely expanded. We now define its counterpart: GetPrevItem(). This function uses the GetLastItem() defined in an earlier section.   // GetNextItem  – Get previous item as if outline was completely expanded […]

FindItemData is another tree control searching function very similar to the FindItem function. Instead of matching a substring of the label, it compares the item’s associated data. If an exact data match is found, the matching item is returned, otherwise NULL. This function uses the functions GetNextItem, GetPrevItem, and GetLastItem seen previously. In order to […]

I’ve been playing around with the new common controls that are distributed with IE 4.0 and one of the neat features is the new style TVS_TRACKSELECT. Basically what it does is underline the current item and then select it if you leave it there long enough. Now to me this is annoying. I don’t mind […]

Everyone knows the new menu-like left pane view’s in IE4. But did you know that this is only a extended TreeView? You can do this by using CUSTONDRAW notification in the new from CTreeCtrl derived class. I called it CTreeMenu. To do this is quite easy. See an code extract below. But note: This works […]

Submitted by Christopher A. Snyder. The CTreeView class does not handle the right mouse button click in a manner like the Explorer window. Actions like highlighting, setting the active item, and where the right mouse menu pops up require some additional code to obtain the appropriate functionality. This article is intented to illustrate what functions […]

You can check items in a treeview control by using either an overlay image or a couple of state images. Both the techniques are fairly simple, but using a state image allows us to show a checkbox and makes it obvious to the user. In this section we allow an item to have only two […]

The tree view control does not support an owner drawn control – not yet. This makes it somewhat difficult to display an image as a background. However, it can be done and we will discuss how. The basic approach is to let the control draw in a memory device context, draw this transparently over the […]

Like any other window, you can set the font of the tree view control. This font is applied to all the item labels. Similarly, all the labels are of the same color. Although the next version of the tree view control will allow the ownerdraw style, for now you have to implement it yourself. Since […]

.   Most user interface oriented applications need a container of some kind (for example, list) and a visual representation of this container in a tree or list control. When a programmer modifies an item in a container, it must also update this specific item in a tree/list control. Vice versa, if a user of […]

In the previous topic we covered how to implement a simple checkbox for each item in the tree control. In this topic we cover a slightly different implementation. The checkbox for each item will indicate whether the item is checked or not and it will also indicate whether any of its descendant is checked or […]

The tree view control has very limited support for multiple selection. It provides a message to set and retrieve the selection state of an item. On the other hand it does not allow setting focus to a particular item without also selecting it. The side effect of this is that previous item is deselected. This […]

One thing Ive never seen ( other than in my applications ) is tooltips for the item images. I am not saying that none of the commercial application use tooltips for the item images, but Ive not seen one yet. In fact, in some of the applications searching through the help file was also fruitless. […]