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MFC - TreeCtrl problems, clicking an item in a Tree control Posted by Rickard on 25 Oct 2000 at 10:09 AM

Hi! 
I'm sitting right here and have a problem... how 
to catch a mouse click on a TreeCtrl item?? 
 
a source code exampel would be great! 
but it's ok with words to describe how to do it. 
 
THANKS! 
 
Using VicualC++ 6.0

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Re: MFC - TreeCtrl problems, clicking an item in a Tree control Posted by KMS on 26 Oct 2000 at 7:17 AM

I cant understand what are you looking for! Sorry, but isnt NM_XXX (NM_CLICK etc) enough? Or what are you trying to do exactly? 
 
: Hi! 
: I'm sitting right here and have a problem... how 
: to catch a mouse click on a TreeCtrl item?? 
: 
: a source code exampel would be great! 
: but it's ok with words to describe how to do it. 
: 
: THANKS! 
: 
: Using VicualC++ 6.0 
:

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KMS!! KMS!! Posted by Rickard on 27 Oct 2000 at 4:00 AM

KMS 
 
I don't know how to erite the code right! 
If I click one time on TreCtrl and the choose NM_CLICK 
in a pop domn menu, then I can edit the code for 
clicking the TREE control, not the items.... how to do so it 
knows it is an item thats was clicked. 
 
hope that will work..... :)

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Rickard!! Rickard!! Posted by KMS on 27 Oct 2000 at 11:58 AM

I got it now! 
 
What you need to do is use WM_NOTIFY (Which of course is sent to the parent of the control ) and look for TVN_SELCHANGED. 
 
For example, say you have IDC_TREE1 on CMyDlg, you would do: 
 
BOOL CMyDlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) 
{ 
LPNM_TREEVIEW p = (LPNM_TREEVIEW) lParam; 
if( wParam == IDC_TREE1 && p->hdr.code == TVN_SELCHANGED ) 
{ 
// p->itemNew.hItem holds the handle of the new item to be selected. 
 
// we want to show the text in a message box, so 
CHAR szBuffer[ 1024 ]; 
 
TV_ITEM Item; 
ZeroMemory( &Item, sizeof( Item ) ); 
Item.mask = TVIF_TEXT; 
Item.hItem = p->itemNew.hItem; 
Item.pszText = szBuffer; 
Item.cchTextMax = sizeof( szBuffer ); 
m_MyTree.GetItem( &Item ); 
AfxMessageBox( szBuffer ); 
} 
 
return CDialog::OnNotify(wParam, lParam, pResult); 
} 
 
 
: KMS 
: 
: I don't know how to erite the code right! 
: If I click one time on TreCtrl and the choose NM_CLICK 
: in a pop domn menu, then I can edit the code for 
: clicking the TREE control, not the items.... how to do so it 
: knows it is an item thats was clicked. 
: 
: hope that will work..... :) 
:

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KMS!! KMS!! AGAIN :) Posted by Unknown on 27 Oct 2000 at 12:36 PM

I see, but it is a few things I don't realy 
understand: 
1. LPNM_TREEVIEW 
2. hdr (where is it declared, or is it a standard thing?) 
3. code(where is it declared, or is it a standard thing?) 
 
where did you learned this stuff?? 
 
with a book? the web?? pleas tell me! 
 
now I promise i wont send any more messages! :) 
 
 
: I got it now! 
: 
: What you need to do is use WM_NOTIFY (Which of course is sent to the parent of the control ) and look for TVN_SELCHANGED. 
: 
: For example, say you have IDC_TREE1 on CMyDlg, you would do: 
: 
: BOOL CMyDlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) 
: { 
: LPNM_TREEVIEW p = (LPNM_TREEVIEW) lParam; 
: if( wParam == IDC_TREE1 && p->hdr.code == TVN_SELCHANGED ) 
: { 
: // p->itemNew.hItem holds the handle of the new item to be selected. 
: 
: // we want to show the text in a message box, so 
: CHAR szBuffer[ 1024 ]; 
: 
: TV_ITEM Item; 
: ZeroMemory( &Item, sizeof( Item ) ); 
: Item.mask = TVIF_TEXT; 
: Item.hItem = p->itemNew.hItem; 
: Item.pszText = szBuffer; 
: Item.cchTextMax = sizeof( szBuffer ); 
: m_MyTree.GetItem( &Item ); 
: AfxMessageBox( szBuffer ); 
: } 
: 
: return CDialog::OnNotify(wParam, lParam, pResult); 
: } 
: 
: 
: : KMS 
: : 
: : I don't know how to erite the code right! 
: : If I click one time on TreCtrl and the choose NM_CLICK 
: : in a pop domn menu, then I can edit the code for 
: : clicking the TREE control, not the items.... how to do so it 
: : knows it is an item thats was clicked. 
: : 
: : hope that will work..... :) 
: : 
: 
: 
:

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KMS!! KMS!! AGAIN :) Posted by Rickard on 27 Oct 2000 at 12:36 PM

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Re: KMS!! KMS!! AGAIN :) Posted by KMS on 27 Oct 2000 at 2:38 PM

NM_TREEVIEW is in commctrl.h, hdr code etc are members of this structure. 
 
Learned from books of course! Inside Visual C++, is a good one. Also Using Visual C++ although it spends alot of time on the beginning stuff. 
 
MSDN CD's is a must also, but I'm sure you have them, I have the Sep 2000 ver on DVD, its fast! I understand that this only comes with MSDN subscription (not free), maybe you can find a friend who has it. 
 
You are welcome to send new messages! 
 
: I see, but it is a few things I don't realy 
: understand: 
: 1. LPNM_TREEVIEW 
: 2. hdr (where is it declared, or is it a standard thing?) 
: 3. code(where is it declared, or is it a standard thing?) 
: 
: where did you learned this stuff?? 
: 
: with a book? the web?? pleas tell me! 
: 
: now I promise i wont send any more messages! :) 
: 
: 
: : I got it now! 
: : 
: : What you need to do is use WM_NOTIFY (Which of course is sent to the parent of the control ) and look for TVN_SELCHANGED. 
: : 
: : For example, say you have IDC_TREE1 on CMyDlg, you would do: 
: : 
: : BOOL CMyDlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult) 
: : { 
: : LPNM_TREEVIEW p = (LPNM_TREEVIEW) lParam; 
: : if( wParam == IDC_TREE1 && p->hdr.code == TVN_SELCHANGED ) 
: : { 
: : // p->itemNew.hItem holds the handle of the new item to be selected. 
: : 
: : // we want to show the text in a message box, so 
: : CHAR szBuffer[ 1024 ]; 
: : 
: : TV_ITEM Item; 
: : ZeroMemory( &Item, sizeof( Item ) ); 
: : Item.mask = TVIF_TEXT; 
: : Item.hItem = p->itemNew.hItem; 
: : Item.pszText = szBuffer; 
: : Item.cchTextMax = sizeof( szBuffer ); 
: : m_MyTree.GetItem( &Item ); 
: : AfxMessageBox( szBuffer ); 
: : } 
: : 
: : return CDialog::OnNotify(wParam, lParam, pResult); 
: : } 
: : 
: : 
: : : KMS 
: : : 
: : : I don't know how to erite the code right! 
: : : If I click one time on TreCtrl and the choose NM_CLICK 
: : : in a pop domn menu, then I can edit the code for 
: : : clicking the TREE control, not the items.... how to do so it 
: : : knows it is an item thats was clicked. 
: : : 
: : : hope that will work..... :) 
: : : 
: : 
: : 
: : 
: 
: 
:

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