[haiku-development] Re: A few questions about the Haiku API
- From: pulkomandy <pulkomandy@xxxxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sun, 3 Jun 2012 18:08:41 +0200
On Sun, Jun 03, 2012 at 05:49:20PM +0200, Barrett wrote:
> The first thing is about BWindow deletion, i've added a configuration
> window to People...my intention is to check if the window is already
> opened before to create a new window, and decide on what to do. My
> first solution was to just set the BWindow object to NULL and then
> check if it's NULL or not...this seems to me the more natural way to
> do it, since the bebook says that the BWindow auto delete itself...i
> assumed that closing a BWindow using the rectangle in the window tab
> will have the result of deleting the object.
> Actually this work, but unfortunately only one time...after the window
> is closed, checking the object for NULL will return false and the
> program crash since the object isn't already valid. Am i doing
> somethng bad?
Deleting an object doesn't mean all pointers are magically reset to
NULL, you have to do that yourself.
>
> The second problem is about showing a BWindow without making it the
> current focus, i've tried a lot of combinations of Show(), Hide(),
> Minimize() ecc. but still i was unable to do it. I've also tried, with
> suggestions of someone in irc, to make it MODAL and FLOATING but i had
> not success also this time...i have the suspect that it's another
> BeAPI limitation (i.e. to show a window without making it the current
> focus is not possible)...any ideas?
Use the flag B_AVOID_FOCUS maybe ? Set the flag, then raise the window,
then unset the flag so the user can focus it again ?
>
> The third problem come up because i'm trying to create a customized
> BTextControl that show a label inside the control rectangle and when a
> user click on it disappear. The first idea i had, was to use the
> BView::MakeFocus() and BView::IsFocus() functions, but then i've
> realized that it's not so simple...from the BeBook :
>
> "Note that the BTextControl itself never becomes the focus view, so
> will return false to all IsFocus() queries."
>
> The main problem in this case is that i can't check when the user
> click on the BTextView to remove such label, is this another
> limitation? I think it's the case where something similar to a
> signal/slot system could help a lot...
Are you sure you need a BTextControl ? I think what you want to do is at
the BTextView level. You can override the BTextView draw method as such
:
* If the view has focus, call the parent BTextView::Draw(),
* If not, draw your custom text instead.
While I'm at it, I noticed another bug in Caya, when I disable the
window getting focus when receiving a message, the window isn't shown at
all when a new conversation starts. So the setting is unusable both ways
: either it steals focus from other apps all the time, or the window
never opens.
--
Adrien.
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