How can I catch a click on an item, and then change all it's subitems states?
I know I can get the selected item with GetFirstSelectedItemPosition, but how do I use the SetItemState on the given position?
EDIT: I was basically looking for this: m_ListControl.SetExtendedStyle(LVS_EX_FULLROWSELECT)
Create a notification handler for the LVN_ITEMCHANGED notification. This handler will be called whenever a new item has been selected either using the mouse or the keyboard. If you particularly need to handle mouse clicks, create a notification handler for the NM_CLICK notification instead.
Both event handlers' LPARAM parameter points to a structure that contains a member called iItem. This is the index to the item just selected or clicked. Use this iItem as the first parameter to the SetItemState method.
Related
I have a ComboBox in a window and i want to execute a function after changing selected item.
When i change the selected item of the combobox by mouse or keyboard,
the CBN_SELCHANGE event in the window message WM_COMMAND works well and my function execute.
But if i use the function ComboBox_SetCurSel for changing the selected item ,it not works.
What window message WM_**** and combox notification do i use for processing the event changing selected item.
In general, when you programmatically manipulate a control, the corresponding notification is not sent to its parent. The notification only gets sent when the user manipulates the control.
So, when you call ComboBox_SetCurSel (which is a macro that performs the same task as sending the CB_SETCURSEL message), that programmatically changes the control's current selection and therefore does not send the CBN_SELCHANGE notification. However, CBN_SELCHANGE does get sent if the user changes the combobox's selection.
This is called out explicitly in the "Remarks" section of the documentation for CBN_SELCHANGE:
The CBN_SELCHANGE notification code is not sent when the current selection is set using the CB_SETCURSEL message.
To work around this, you can do one of two things:
Call your event-handler method directly. For example, in MFC, you would have the framework attach an OnCbnSelChange member function to handle the combobox's CBN_SELCHANGE notification. After your code that called ComboBox_SetCurSel, you would simply call that OnCbnSelChange member function manually:
ComboBox_SetCurSel(hwndComboBox, 0); // select 1st item
this->OnCbnSelChange(); // invoke the change event-handler
Your GUI framework undoubtedly has something similar.
Manually send the CBN_SELCHANGE notification to the control's parent. I don't really know why you would ever do this, because the default window procedure doesn't do anything interesting upon receipt of this notification; you would be much better off just calling your own handler directly.
::PostMessage(hwndParent,
WM_COMMAND,
MAKEWPARAM(IDC_COMBOBOX, CBN_SELCHANGE),
reinterpret_cast<LPARAM>(hwndComboBox);
Or, if you were doing this from a subclass of the combobox:
HWND hwndParent = ::GetAncestor(hwndComboBox, GA_PARENT);
int ctrlID = static_cast<int>(::GetWindowLongPtr(hwndComboBox, GWLP_ID));
::PostMessage(hwndParent,
WM_COMMAND,
MAKEWPARAM(ctrlID, CBN_SELCHANGE),
reinterpret_cast<LPARAM>(hwndComboBox));
My CListCtrl (Report View, single column) ignores item selection when there's another control behind the CListCtrl. It's as if the click passes through to the control BEHIND the CListCtrl.
Selection is fine if the list item isn't on top of another dialog-box item.
It's baffling because the CListCtrl's z order is ABOVE these other controls. Can anyone suggest something I could try to make the CListCtrl accept a click even when there's another overlapped control? Thanks!
User Spy++ to check the message flow. And to check if another control is above your control! Maybe there is something wrong with you´r z-order even if you think that the control is above. Also check if you overwrote WM_NCHITTEST
Can anybody tell me, if I select an item in tree control than how I'll get that text in List control at the same time. I am getting how to do it?
Please help me out.
When a CTreeCtrl has an item selected, there is a WM_NOTIFY notification of TVN_SELCHANGED - See MSDN for details.
As it also says in MSDN :
As the user interacts with the control, it will send various
notification messages. You can specify a function to handle each of
the messages you want to handle by adding an ON_NOTIFY_REFLECT
macro in your control window's message map or by adding an
ON_NOTIFY macro to your parent window's message map.
If you do this, you will detect the clicked item, from which you can retrieve the text and add an entry to a list (or whatever else you need to do).
If I have a listview control in report mode, how could I stick a syslink control into one of the columns?
I want to have a link the user can click in one of the columns.
The listview control doesn't support this itself.
You could create a real Syslink control that's a child of the listview. You would need to sub-class the listview and reposition the Syslink control whenever the list scrolls (watch for WM_HSCROLL / WM_VSCROLL messages) or when items are added or removed, or when it's sorted. You can use LVM_GETSUBITEMRECT to find out where to position it.
Alternatively, you could handle it yourself by using NM_CUSTOMDRAW to display the "link" in a different color, and handle NM_CLICK to catch when the user clicks on the link. This would be the simplest method in my opinion. Note that if you want a hand cursor to be displayed over the link you would still need to sub-class the list and handle WM_SETCURSOR yourself.
I have a app that has items that can contain child items and so on.
Each item has a mouseDown event that i want to be able to use to click and select an item.
The problem is that when i click a child item the parents mouseDown event is also being called.
How do i stop this so the mouseDown event only gets called once or if thats not posible i actually want the function called within the mouseDown event to only get called once.
Here is a jsfiddle to very simply show this. http://jsfiddle.net/rmossuk/W9vmW/1/
If you click no the Click here its mouse down event gets called twice.
You have to return false; in the mouseDown function.
Or you can you use event.stopPropagation(). I updated your fiddle, see http://jsfiddle.net/W9vmW/2/.
There is more informations about how event bubbling in ember works here - http://emberjs.com/guides/view_layer/#toc_event-bubbling
Events will bubble up the view hierarchy until the event reaches the root view. An event handler can stop propagation using the same techniques as normal jQuery event handlers:
return false from the method
event.stopPropagation