wx.treecontrol.GetSelection question?

wxPython Users
1

Hello again,

I am trying to determine if a user has selected anything in a wxtreecontrol. I’m using GetSelection - I read in the documentation that it will return an “invalid item” if nothing is selected. What is an “invalid item.” I want to execute a piece of code depending upon if something is selected in the tree. although I’m not sure how to handle an “invalid item.” Perhaps there is a better way to do this?

As always, thanks for the help!

Jeff

2

Hi Jeff,

Jeff Peery wrote:

Hello again,
I am trying to determine if a user has selected anything in a wxtreecontrol. I'm using GetSelection - I read in the documentation that it will return an "invalid item" if nothing is selected. What is an "invalid item."

I am not sure but I would guess "-1"

I want to execute a piece of code depending upon if something is selected in the tree. although I'm not sure how to handle an "invalid item." Perhaps there is a better way to do this?

Check if GetSelection returns "-1" then you do nothing otherwise you do whatever.

As always, thanks for the help!
Jeff

See you
Werner

3

Sex, 2005-06-24 às 18:25 +0200, Werner F. Bruhin escreveu:

Hi Jeff,

Jeff Peery wrote:

> Hello again,
>
> I am trying to determine if a user has selected anything in a
> wxtreecontrol. I'm using GetSelection - I read in the documentation
> that it will return an "invalid item" if nothing is selected. What is
> an "invalid item."

I am not sure but I would guess "-1"

From docs:

"You can test whether an item is valid by calling wxTreeItemId::IsOk."

So you could do something like this:
item.IsOk()

See the TreeCtrl demo. It's using the IsOk.

Ricardo

4

that will work! thanks.

···

Ricardo Pedroso ricardo.pedroso@netvisao.pt wrote:

Sex, 2005-06-24 às 18:25 +0200, Werner F. Bruhin escreveu:

Hi Jeff,

Jeff Peery wrote:

Hello again,

I am trying to determine if a user has selected anything in a
wxtreecontrol. I’m using GetSelection - I read in the documentation
that it will return an “invalid item” if nothing is selected. What is
an “invalid item.”

I am not sure but I would guess “-1”

From docs:
“You can test whether an item is valid by calling wxTreeItemId::IsOk.”

So you could do something like this:
item.IsOk()

See the TreeCtrl demo. It’s using the IsOk.

Ricardo

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5

I did do this, I used: print treectrl.getselection(), it returns some instance, something other than -1. the documentation says invalid item. Is there anything

···

“Werner F. Bruhin” werner.bruhin@free.fr wrote:

Hi Jeff,

Jeff Peery wrote:

Hello again,

I am trying to determine if a user has selected anything in a
wxtreecontrol. I’m using GetSelection - I read in the documentation
that it will return an “invalid item” if nothing is selected. What is
an “invalid item.”

I am not sure but I would guess “-1”

I want to execute a piece of code depending upon if something is
selected in the tree. although I’m not sure how to handle an “invalid
item.” Perhaps there is a better way to do this?

Check if GetSelection returns “-1” then you do nothing otherwise you do
whatever.

As always, thanks for the help!

Jeff

See you
Werner

To unsubscribe, e-mail:
wxPython-users-unsubscribe@lists.wxwidgets.org
For additional commands, e-mail: wxPython-users-help@lists.wxwidgets.org

6

I did do this, I used: print treectrl.getselection(), it returns some instance, something other than -1. the documentation says invalid item. Is there anything

···

“Werner F. Bruhin” werner.bruhin@free.fr wrote:

Hi Jeff,

Jeff Peery wrote:

Hello again,

I am trying to determine if a user has selected anything in a
wxtreecontrol. I’m using GetSelection - I read in the documentation
that it will return an “invalid item” if nothing is selected. What is
an “invalid item.”

I am not sure but I would guess “-1”

I want to execute a piece of code depending upon if something is
selected in the tree. although I’m not sure how to handle an “invalid
item.” Perhaps there is a better way to do this?

Check if GetSelection returns “-1” then you do nothing otherwise you do
whatever.

As always, thanks for the help!

Jeff

See you
Werner

To unsubscribe, e-mail:
wxPython-users-unsubscribe@lists.wxwidgets.org
For additional commands, e-mail: wxPython-users-help@lists.wxwidgets.org

7

I did do this, I used: print treectrl.getselection(), it returns some instance, something other than -1. the documentation says invalid item. Is there anything

···

“Werner F. Bruhin” werner.bruhin@free.fr wrote:

Hi Jeff,

Jeff Peery wrote:

Hello again,

I am trying to determine if a user has selected anything in a
wxtreecontrol. I’m using GetSelection - I read in the documentation
that it will return an “invalid item” if nothing is selected. What is
an “invalid item.”

I am not sure but I would guess “-1”

I want to execute a piece of code depending upon if something is
selected in the tree. although I’m not sure how to handle an “invalid
item.” Perhaps there is a better way to do this?

Check if GetSelection returns “-1” then you do nothing otherwise you do
whatever.

As always, thanks for the help!

Jeff

See you
Werner

To unsubscribe, e-mail:
wxPython-users-unsubscribe@lists.wxwidgets.org
For additional commands, e-mail: wxPython-users-help@lists.wxwidgets.org