Re: Listview size
- From: Jason Newell <nospam@xxxxxxxxxx>
- Date: Thu, 14 Apr 2005 15:34:21 -0500
JL,
There should not be any downsides that I know of. Internally, the .NET ListView is making the same API calls, you just don't know it.
I'm verse with the ListView API calls because I wrote my own .NET ListView control. So I browsed around through the LVM_'s definitions looking for one to do what you wanted.
I'm glad it worked for you. You hadn't responded to my 2nd post so I thought it wasn't what you were needing (again like in 1st post).
Jason Newell, MCAD Software Engineer
J L wrote:
Hi Jason, OMG...I did not try your suggestion and that was the one I needed!!! THANK YOU
so now here is what I do:
1. first size each column to fit the data (width = -1) (Note: width = -2 sizes the column to the header, so actually I get the header width first and then use the larger of the two widths).
2. Set the listview width to be the sum of all the column widths + 2 times the Border3DSize + the width of a vertical scrow bar (Note, if you do not include the width of the vertical scrow bar the LVM_GETCOUNTPERPAG message will return a count which allows for a horizontal scroll bar.)
3. Read the number of items that will fit using the LVM_GETCOUNTPERPAGE message.
4. If the number of actual items is less than the number items that will fit, I reset the listview width to not include the width of a vertical scroll bar since there will not be one there.
This works like a champ. I have to admit, I usually stear away from API calls but this works great. Are there any downsides to using it?
Thanks again Jason!! Great suggestion.
John
On Thu, 14 Apr 2005 14:38:11 -0500, Jason Newell <nospam@xxxxxxxxxx> wrote:
JL,
Just curiuos, did sending the LVM_GETCOUNTPERPAGE meesage work for you? The LVM_GETCOUNTPERPAGE will tell you how man ListViewItems can be displayed before the scrollbar appears.
MSDN Quote: "LVM_GETCOUNTPERPAGE calculates the number of items that can fit vertically in the visible area of a list-view control when in list or report view. Only fully visible items are counted."
Just curious.
Jason Newell, MCAD Software Engineer
J L wrote:
For those interested in this thread, here is what I have found that seems to work:
Dim r As Rectangle = theListView.Items(0).Bounds
Dim htItems As Integer
' get whole number of items that will fit
' in the listview
htItems = theListView.Height/r.Height
' allow for column headers...not sure why 2 instead of 1
If htItems < theListView.Items.Count + 2
theListView.Width = sumOfColumnWidths + _
(SystemInformation.Border3DSize.Width * 2) + _
SystemInformation.VerticalScrollBarWidth
Else
theListView.Width = sumOfColumnWidths + _
(SystemInformation.Border3DSize.Width * 2) End If
This does fail on the condition that the last row that fills the list view only partially fits. It puts the vertical scrow bar in the listview but does not increase the size. I can write code to size th e list view to an exact row count but if this is called repeatedly, I loose track of the initial design height...does that make any sense to any one...the code to size it to a whole number of rows is to add before the If...End If clause:
theListView.Height = (htItems + 1) * r.Height
(i.e. use the number of items and the height of each, allow for the headers)
If anyone has a comment, sees an error or knows a better approach, I would appreciate your inputs.
TIA, John
On Wed, 13 Apr 2005 10:47:50 -0700, J L <ystem> wrote:
When I fill a listview, I resize the columns to fit the data. I need to know if the data will fit vertically or if there will be a vertical scroll bar. I need to know this so I can allow for it on the overall size of the listview.
My question therefore is, how can I tell if the items I have added will fit in the listview at its given height?
A secondary one, just for interest sake...is there a way to determine the exact heght needed to hold the items?
TIA, John
.
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