Поиск на сайте
Главная Журнал Форум Wiki DRKB Страны мира


Owner draw CListCtrl row height

Rob Warner -- rhwarner@southeast.net
Monday, January 20, 1997

Environment: VC++ 4.2b, Win95, Win NT 4.0

I have a CListCtrl-derived class (always in Report view) in which I need to
display two different fonts, which are user-configurable at run time.  So,
I make it owner draw, override DrawItem(), and do my drawing.  When the
user changes one or the other font, I calculate which font is taller, so I
know how tall my row height needs to be to properly display the row. 
Unfortunately, I can't figure out how to set the row height.

I tried the obvious and created the appropriate font (with the proper
scope), and used SetFont().  This works like a champ in a non-owner draw
CListCtrl.  In my owner draw, however, it sets the height of the Header
Cntrl, but doesn't change the height of the rect I'm passed in DrawItem().

Any ideas, before I give up and rewrite it as a CListBox with a CHeaderCtrl
and have to handle all the column resizing myself?
<<<<<>>>>>
Rob Warner
rhwarner@southeast.net
http://users.southeast.net/~rhwarner




Lubimov Alexey -- Lubimov@softlab.r-style.ru
Wednesday, January 22, 1997

[Mini-digest: 2 responses]

One of the ways to dynamically change listview's item height, provided
that the listview has LVS_OWNERDRAWFIXED style, is as follows:

You have to provoke system to send WM_MEASUREITEM to the control.
Normally, this message is sent only when the control is created. To
force system to re-send this message, you have to change the window's
size (this is probably undocumented method, but it works, 'cause I use
it for the same reason):

---cut here---

     CRect rect;
     GetWindowRect( &rect );
     if ( GetParent() )
        {
         // Adjust coordinates to client area

         GetParent()->ScreenToClient( &rect.TopLeft() );
         GetParent()->ScreenToClient( &rect.BottomRight() );
        
         // Change window size - this will provoke WM_MEASUREITEM

         SetWindowPos( NULL, 
                       rect.left, rect.top, rect.Width()+1,
rect.Height(),
                       SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOOWNERZORDER|
                       SWP_NOREDRAW|SWP_NOZORDER );

         // Restore window size - this will provoke WM_MEASUREITEM too

         SetWindowPos( NULL, 
                       rect.left, rect.top, rect.Width(), rect.Height(),
                       SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOOWNERZORDER|
                       SWP_NOREDRAW|SWP_NOZORDER );
        }

---cut here---

The only drawback of this method is that WM_MEASUREITEM message is sent
_twice_; otherwise it's quite acceptable (to my taste).

Hope this helps,
Alex


>-----Original Message-----
>From:	Rob Warner [SMTP:rhwarner@southeast.net]
>Sent:	Monday, January 20, 1997 7:19 PM
>To:	MFC List
>Subject:	Owner draw CListCtrl row height
>
>Environment: VC++ 4.2b, Win95, Win NT 4.0
>
>I have a CListCtrl-derived class (always in Report view) in which I need to
>display two different fonts, which are user-configurable at run time.  So,
>I make it owner draw, override DrawItem(), and do my drawing.  When the
>user changes one or the other font, I calculate which font is taller, so I
>know how tall my row height needs to be to properly display the row. 
>Unfortunately, I can't figure out how to set the row height.
>
>I tried the obvious and created the appropriate font (with the proper
>scope), and used SetFont().  This works like a champ in a non-owner draw
>CListCtrl.  In my owner draw, however, it sets the height of the Header
>Cntrl, but doesn't change the height of the rect I'm passed in DrawItem().
>
>Any ideas, before I give up and rewrite it as a CListBox with a CHeaderCtrl
>and have to handle all the column resizing myself?
><<<<<>>>>>
>Rob Warner
>rhwarner@southeast.net
>http://users.southeast.net/~rhwarner
>
-----From: Amir Shoval 

Try overriding MeasureItem.

--------------------------------------------------
Amir Shoval          N.C.C. ISRAEL
                amirs@ncc.co.il
--------------------------------------------------

>----------
>From: 	Rob Warner[SMTP:rhwarner@southeast.net]
>Sent: 	=E9=E5=ED =F9=F0=E9 20 =E9=F0=E5=E0=F8 1997 18:19
>To: 	MFC List
>Subject: 	Owner draw CListCtrl row height
>
>Environment: VC++ 4.2b, Win95, Win NT 4.0
>
>I have a CListCtrl-derived class (always in Report view) in which I =
need to
>display two different fonts, which are user-configurable at run time.  =
So,
>I make it owner draw, override DrawItem(), and do my drawing.  When the
>user changes one or the other font, I calculate which font is taller, =
so I
>know how tall my row height needs to be to properly display the row.=20
>Unfortunately, I can't figure out how to set the row height.
>
>I tried the obvious and created the appropriate font (with the proper
>scope), and used SetFont().  This works like a champ in a non-owner =
draw
>CListCtrl.  In my owner draw, however, it sets the height of the Header
>Cntrl, but doesn't change the height of the rect I'm passed in =
DrawItem().
>
>Any ideas, before I give up and rewrite it as a CListBox with a =
CHeaderCtrl
>and have to handle all the column resizing myself?
><<<<<>>>>>
>Rob Warner
>rhwarner@southeast.net
>http://users.southeast.net/~rhwarner
>
>



Rob Warner -- rhwarner@southeast.net
Thursday, January 23, 1997

[Mini-digest: 2 responses]

I had tried the MeasureItem() route, but unless I'm sadly mistaken,
WM_MEASUREITEM is never sent for a CListCtrl.  Perhaps the suggestions
listed below were based on CListBox?  I tried using ClassWizard to add a
handler for WM_MEASUREITEM, then set a breakpoint in OnMeasureItem(), and
never hit it.  I also tried overriding MeasureItem(), set a breakpoint, and
never hit that.  In both functions I tried setting the
LPMEASUREITEMSTRUCT->itemHeight to various values, but no discernible
effect occurred.
BTW, I also tried resizing the list control, as suggested below, to force
the WM_MEASUREITEM, but no dice.
I'm still open for suggestions.
<<<<<>>>>>
Rob Warner
rhwarner@southeast.net
http://users.southeast.net/~rhwarner


----------
> From: Lubimov Alexey 
> To: 'mfc-l@netcom.com'
> Subject: RE: Owner draw CListCtrl row height
> Date: Wednesday, January 22, 1997 9:06 AM
> 
> [Mini-digest: 2 responses]
> 
> One of the ways to dynamically change listview's item height, provided
> that the listview has LVS_OWNERDRAWFIXED style, is as follows:
> 
> You have to provoke system to send WM_MEASUREITEM to the control.
> Normally, this message is sent only when the control is created. To
> force system to re-send this message, you have to change the window's
> size (this is probably undocumented method, but it works, 'cause I use
> it for the same reason):
> 
> ---cut here---
> 
>      CRect rect;
>      GetWindowRect( &rect );
>      if ( GetParent() )
>         {
>          // Adjust coordinates to client area
> 
>          GetParent()->ScreenToClient( &rect.TopLeft() );
>          GetParent()->ScreenToClient( &rect.BottomRight() );
>         
>          // Change window size - this will provoke WM_MEASUREITEM
> 
>          SetWindowPos( NULL, 
>                        rect.left, rect.top, rect.Width()+1,
> rect.Height(),
>                        SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOOWNERZORDER|
>                        SWP_NOREDRAW|SWP_NOZORDER );
> 
>          // Restore window size - this will provoke WM_MEASUREITEM too
> 
>          SetWindowPos( NULL, 
>                        rect.left, rect.top, rect.Width(), rect.Height(),
>                        SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOOWNERZORDER|
>                        SWP_NOREDRAW|SWP_NOZORDER );
>         }
> 
> ---cut here---
> 
> The only drawback of this method is that WM_MEASUREITEM message is sent
> _twice_; otherwise it's quite acceptable (to my taste).
> 
> Hope this helps,
> Alex
> 
> 
> >-----Original Message-----
> >From:	Rob Warner [SMTP:rhwarner@southeast.net]
> >Sent:	Monday, January 20, 1997 7:19 PM
> >To:	MFC List
> >Subject:	Owner draw CListCtrl row height
> >
> >Environment: VC++ 4.2b, Win95, Win NT 4.0
> >
> >I have a CListCtrl-derived class (always in Report view) in which I need
to
> >display two different fonts, which are user-configurable at run time. 
So,
> >I make it owner draw, override DrawItem(), and do my drawing.  When the
> >user changes one or the other font, I calculate which font is taller, so
I
> >know how tall my row height needs to be to properly display the row. 
> >Unfortunately, I can't figure out how to set the row height.
> >
> >I tried the obvious and created the appropriate font (with the proper
> >scope), and used SetFont().  This works like a champ in a non-owner draw
> >CListCtrl.  In my owner draw, however, it sets the height of the Header
> >Cntrl, but doesn't change the height of the rect I'm passed in
DrawItem().
> >
> >Any ideas, before I give up and rewrite it as a CListBox with a
CHeaderCtrl
> >and have to handle all the column resizing myself?
> ><<<<<>>>>>
> >Rob Warner
> >rhwarner@southeast.net
> >http://users.southeast.net/~rhwarner
> >
> -----From: Amir Shoval 
> 
> Try overriding MeasureItem.
> 
> --------------------------------------------------
> Amir Shoval          N.C.C. ISRAEL
>                 amirs@ncc.co.il
> --------------------------------------------------
> 
> >----------
> >From: 	Rob Warner[SMTP:rhwarner@southeast.net]
> >Sent: 	=E9=E5=ED =F9=F0=E9 20 =E9=F0=E5=E0=F8 1997 18:19
> >To: 	MFC List
> >Subject: 	Owner draw CListCtrl row height
> >
> >Environment: VC++ 4.2b, Win95, Win NT 4.0
> >
> >I have a CListCtrl-derived class (always in Report view) in which I =
> need to
> >display two different fonts, which are user-configurable at run time.  =
> So,
> >I make it owner draw, override DrawItem(), and do my drawing.  When the
> >user changes one or the other font, I calculate which font is taller, =
> so I
> >know how tall my row height needs to be to properly display the row.=20
> >Unfortunately, I can't figure out how to set the row height.
> >
> >I tried the obvious and created the appropriate font (with the proper
> >scope), and used SetFont().  This works like a champ in a non-owner =
> draw
> >CListCtrl.  In my owner draw, however, it sets the height of the Header
> >Cntrl, but doesn't change the height of the rect I'm passed in =
> DrawItem().
> >
> >Any ideas, before I give up and rewrite it as a CListBox with a =
> CHeaderCtrl
> >and have to handle all the column resizing myself?
> ><<<<<>>>>>
> >Rob Warner
> >rhwarner@southeast.net
> >http://users.southeast.net/~rhwarner
> >
> >
-----From: "Rob Warner" 

I stand corrected.  I looked at the MFC code a little closer, and realized
that CListCtrl::OnChildNotify() doesn't call MeasureItem for a
WM_MEASUREITEM as CListBox does.  Why is that?  Anyway, I added a handler
for WM_MEASUREITEM in my dialog class and called CMyListCtrl::MeasureItem()
myself and everything works.  Thanks for the help!
<<<<<>>>>>
Rob Warner
rhwarner@southeast.net
http://users.southeast.net/~rhwarner


----------
> From: Lubimov Alexey 
> To: 'mfc-l@netcom.com'
> Subject: RE: Owner draw CListCtrl row height
> Date: Wednesday, January 22, 1997 9:06 AM
> 
> [Mini-digest: 2 responses]
> 
> One of the ways to dynamically change listview's item height, provided
> that the listview has LVS_OWNERDRAWFIXED style, is as follows:
> 
> You have to provoke system to send WM_MEASUREITEM to the control.
> Normally, this message is sent only when the control is created. To
> force system to re-send this message, you have to change the window's
> size (this is probably undocumented method, but it works, 'cause I use
> it for the same reason):
> 
> ---cut here---
> 
>      CRect rect;
>      GetWindowRect( &rect );
>      if ( GetParent() )
>         {
>          // Adjust coordinates to client area
> 
>          GetParent()->ScreenToClient( &rect.TopLeft() );
>          GetParent()->ScreenToClient( &rect.BottomRight() );
>         
>          // Change window size - this will provoke WM_MEASUREITEM
> 
>          SetWindowPos( NULL, 
>                        rect.left, rect.top, rect.Width()+1,
> rect.Height(),
>                        SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOOWNERZORDER|
>                        SWP_NOREDRAW|SWP_NOZORDER );
> 
>          // Restore window size - this will provoke WM_MEASUREITEM too
> 
>          SetWindowPos( NULL, 
>                        rect.left, rect.top, rect.Width(), rect.Height(),
>                        SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOOWNERZORDER|
>                        SWP_NOREDRAW|SWP_NOZORDER );
>         }
> 
> ---cut here---
> 
> The only drawback of this method is that WM_MEASUREITEM message is sent
> _twice_; otherwise it's quite acceptable (to my taste).
> 
> Hope this helps,
> Alex
> 
> 
> >-----Original Message-----
> >From:	Rob Warner [SMTP:rhwarner@southeast.net]
> >Sent:	Monday, January 20, 1997 7:19 PM
> >To:	MFC List
> >Subject:	Owner draw CListCtrl row height
> >
> >Environment: VC++ 4.2b, Win95, Win NT 4.0
> >
> >I have a CListCtrl-derived class (always in Report view) in which I need
to
> >display two different fonts, which are user-configurable at run time. 
So,
> >I make it owner draw, override DrawItem(), and do my drawing.  When the
> >user changes one or the other font, I calculate which font is taller, so
I
> >know how tall my row height needs to be to properly display the row. 
> >Unfortunately, I can't figure out how to set the row height.
> >
> >I tried the obvious and created the appropriate font (with the proper
> >scope), and used SetFont().  This works like a champ in a non-owner draw
> >CListCtrl.  In my owner draw, however, it sets the height of the Header
> >Cntrl, but doesn't change the height of the rect I'm passed in
DrawItem().
> >
> >Any ideas, before I give up and rewrite it as a CListBox with a
CHeaderCtrl
> >and have to handle all the column resizing myself?
> ><<<<<>>>>>
> >Rob Warner
> >rhwarner@southeast.net
> >http://users.southeast.net/~rhwarner
> >
> -----From: Amir Shoval 
> 
> Try overriding MeasureItem.
> 
> --------------------------------------------------
> Amir Shoval          N.C.C. ISRAEL
>                 amirs@ncc.co.il
> --------------------------------------------------
> 
> >----------
> >From: 	Rob Warner[SMTP:rhwarner@southeast.net]
> >Sent: 	=E9=E5=ED =F9=F0=E9 20 =E9=F0=E5=E0=F8 1997 18:19
> >To: 	MFC List
> >Subject: 	Owner draw CListCtrl row height
> >
> >Environment: VC++ 4.2b, Win95, Win NT 4.0
> >
> >I have a CListCtrl-derived class (always in Report view) in which I =
> need to
> >display two different fonts, which are user-configurable at run time.  =
> So,
> >I make it owner draw, override DrawItem(), and do my drawing.  When the
> >user changes one or the other font, I calculate which font is taller, =
> so I
> >know how tall my row height needs to be to properly display the row.=20
> >Unfortunately, I can't figure out how to set the row height.
> >
> >I tried the obvious and created the appropriate font (with the proper
> >scope), and used SetFont().  This works like a champ in a non-owner =
> draw
> >CListCtrl.  In my owner draw, however, it sets the height of the Header
> >Cntrl, but doesn't change the height of the rect I'm passed in =
> DrawItem().
> >
> >Any ideas, before I give up and rewrite it as a CListBox with a =
> CHeaderCtrl
> >and have to handle all the column resizing myself?
> ><<<<<>>>>>
> >Rob Warner
> >rhwarner@southeast.net
> >http://users.southeast.net/~rhwarner
> >
> >



Lubimov Alexey -- Lubimov@softlab.r-style.ru
Monday, January 27, 1997

Rob,

Make sure that your listview control has LVS_OWNERDRAWFIXED style when
the window is created. If necessary, overload PreCreateWindow function
to force this style.

You don't have to add WM_MEASUREITEM handler to your class, because
you'd better use virtual method MeasureItem.


>-----Original Message-----
>From:	Rob Warner [SMTP:rhwarner@southeast.net]
>Sent:	Friday, January 24, 1997 5:57 AM
>To:	mfc-l@netcom.com
>Subject:	Re: Owner draw CListCtrl row height
>
>[Mini-digest: 2 responses]
>
>I had tried the MeasureItem() route, but unless I'm sadly mistaken,
>WM_MEASUREITEM is never sent for a CListCtrl.  Perhaps the suggestions
>listed below were based on CListBox?  I tried using ClassWizard to add a
>handler for WM_MEASUREITEM, then set a breakpoint in OnMeasureItem(), and
>never hit it.  I also tried overriding MeasureItem(), set a breakpoint, and
>never hit that.  In both functions I tried setting the
>LPMEASUREITEMSTRUCT->itemHeight to various values, but no discernible
>effect occurred.
>BTW, I also tried resizing the list control, as suggested below, to force
>the WM_MEASUREITEM, but no dice.
>I'm still open for suggestions.
><<<<<>>>>>
>Rob Warner
>rhwarner@southeast.net
>http://users.southeast.net/~rhwarner
>
>[ skipped ]




| Вернуться в корень Архива |

Основные разделы сайта


 

Реклама