Listview Questions

[Paul Dwyer]

I have been reading through some of the MDSN docs of the listview control and there are a couple of things I don't understand.

1. What is a Virtual Listview (one with LVS_OWNERDATA set) and how is it different?
2. Are the Macros mentioned usable in PB, The way they are mentioned it doesn't seem like C macros but possibly implimented in the API for the control.

Macros like:
Listview_SetExtendedListViewStyle
Listview_SetExtendedListViewStyleEx
Listview_GetExtendedListViewStyle

The rest I think I understand from the examples listed at this forum, that you all that.

Cheers



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Paul Dwyer
Network Engineer
Aussie in Tokyo

[Paul Dwyer]

hmmm... not a very popular question

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Paul Dwyer
Network Engineer
Aussie in Tokyo

[Tom Hanlin]

Not my field of expertise, but perhaps I can be of some help.

A virtual list view provides just the framework of what a regular list view
gives you. Storing, retrieving and manipulating list items is up to you,
which gives you a great deal more flexibility (and capacity) than the normal
list view, at the cost of having to do much more of the work yourself.

When MSDN says macros, it indeed means C macros. In PowerBASIC, these are
implemented as Subs or Functions. Look for them in COMMCTRL.INC.

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Tom Hanlin
PowerBASIC Staff

[Semen Matusovski]

Much easy to look MSDN and instead of subs/functions to use ordinary SendMessage.
For example
ListView_SetExtendedListViewStyle
Sets extended styles for list view controls. You can use this macro or send the LVM_SETEXTENDEDLISTVIEWSTYLE message explicitly.
Let's open LVM_SETEXTENDEDLISTVIEWSTYLE
wParam = (WPARAM)dwExMask
lParam = (LPARAM)dwExStyle
And full description of styles. What's necessary else ?



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E-MAIL: [email protected]

[Bruce Brown]

Paul,

I have some sample source code (PBDLL5 SDK style) for implementing a
virtual listview if you are interested. I use it primarily for
displaying selected record fields from databases. It is a little
slower than a LV control whose data is held in memory, but fast
for most applications. It also has the benefit of not exhibiting
the lengthy delay LV controls with thousands of items experience when
destroyed.

Email me for info
Bruce Brown
[email protected]


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