I'm using lineInitialize and lineopen to do things like query signal strength, but I was wondering what four of the parameters to the Callback are. I'm talking about the Callback made in LineInitialize.
The parameters I would like to get more info on are:
Msg, Param1, Param2, Param3
I believe Param2 is the Line Register Status, with values like LINEREGSTATUS_HOME but what are the others? The help on the function is extremely vague? Are the values device dependent? If so, does anyone know what the values are for the XDA/XDA2?
Ahh forget it...
The Param1, Param2, Param3 change depending on the MsgType, and the message type is defined in tapi.h
Hi all,
I am using eVC++ 4.0, and i've dynamically created a CListView like this:
Code:
lv.Create(0,_T(""),WS_CHILD|WS_VISIBLE,r,this,5);
but I dont know how to handle the events of this control... any ideas??
Mohammad
To get events from a listview (win32) I normally subclass it. I use the subclassing routine to post a message back to the parent when the user is doing something like tapping on it, then the windows routine can check whats selected etc and act on it. Is subclassing possible in mfc ?( I don't use it).
Thank u
but can anybody post some code??
thnx
Ok, I am a bit lazy to look up code at the moment, but here's something:
Yes, subclassing is possible in MFC. You just derive your class from the basic class provided like this:
Code:
class MyListView : pubic CListView
Then you add message handlers in the normal matter.
EDIT: The following passage is incorrect:
But I think subclassing may not be necessary in you case. List box controls send WM_COMMAND messages with notifications of major events like selection change to the parent window. All you have to do is to create a WM_COMMAND handler in your parent class.
Sorry I was thinking of ListBox not list view when I wrote it.
To manually add message handlers you need to put macros like ON_MESAGE or ON_COMMAND in the DECLARE_MESSAGE_MAP section of the class cpp file. All the detaisl are available on MSDN.
Are you saying that a listview will send the same WM_COMMAND as a list box in mfc? Dose this also happen in win32 made listviews. I have always thought it was a bit too tedious to find out when the user taps an item in the listview.
After reading your post levenum I had a quick look and it says that a WM_NOTIFY gets sent to the parent with a LVN_ITEMCHANGED for example. I had not used the LVN_**** because when I looked at them there was none that seem to deal with selections. I would guess that LVN_ITEMACTIVATE or LVN_ODSTATECHANGED would be usefull for this but then a second tap would not be picked up still leaving me wanting subclassing in many situations to get the users tap.
Ok, I have read what u wrote guys and my problem is almost solved, I used the OnNotify() method to handle messages sent from child controls like this:
Code:
BOOL CTest2Dlg::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
// TODO: Add your specialized code here and/or call the base class
if(wParam ==5 ) //5 is control ID
{
NMHDR *ph =(NMHDR*)lParam;
if(ph->code==NM_CLICK)
MessageBox("Click");
else if(ph->code==HDN_ITEMCLICK)
MessageBox("Item Click");
else
{
CString str;
str.Format("%d",ph->code);
MessageBox(str);
}
}
return CDialog::OnNotify(wParam, lParam, pResult);
}
Now there still a very small prolem: what messages should I handle for 'Selected Item Changed' event ?? I know its easy but I couldnt find it
Regards
mohgdeisat: I am sorry, I made a mistake about WM_COMMAND.
OdeeanRDeathshead is right, I was thinking of a list box not list view.
To make up for this, here is some sample code from a win32 dialog app that uses list view control. I hope it will be of some help:
Code:
//this is from the dialog window function:
case WM_NOTIFY: //handle events:
nmhdr = (LPNMHDR)lParam;
switch (nmhdr->idFrom)
{
case IDC_LEDLIST: //list control ID.
return OnLEDListEvent(hwndDlg, (LPNMLISTVIEW)lParam);
break;
}
break;
BOOL OnLEDListEvent(HWND hwndDlg, LPNMLISTVIEW nmlv)
{
/////
// Handles list view control notification messages
switch (nmlv->hdr.code)
{
case LVN_ITEMCHANGED:
return OnLEDListItemChanged(hwndDlg, nmlv);
break;
}
return 0;
}
BOOL OnLEDListItemChanged(HWND hwndDlg, LPNMLISTVIEW nmlv)
{
if (ListView_GetSelectionMark(nmlv->hdr.hwndFrom) != nmlv->iItem) return 0;
/* do what you need here */
return 0;
}
Don't mind the fact that I used 3 different functions. This is part of a bigger program and I am trying to keep things well organized without resorting to classes.
As I understand it, LVN_ITEMCHANGE is received for different reasons so I try to handle only the one coming from selected item. LVN_ITEMACTIVATE is only sent when you double click the item so if you just want to catch selection change you need to use LVN_ITEMCHANGE.
Once again, sorry for confusing you before.
thanx pals, good job!!!
I think my problem is now solved with ur help :wink:
Mohammad
Ok guys, I said that my problem was solved, yet, another problem arises...
When the list view is in the report mode, how can I determine when a header button is clicked, and determine which one was clicked???????
thanx in advance
To identify a header column click, you need to handle the WM_NOTIFY/HDN_ITEMCLICK message. Normally this message will be received by the header's parent control (i.e. the listview) -- some frameworks may redirect the message to the header control itself. I haven't worked with MFC in 10 years so I can't really if it reflects notification messages back to the control.
If you're trying to implement column sort, do yourself a favor and check out the Windows Template Library (WTL) at sourceforge.net. It's a set of C++ template classes that provide a thin yet useful wrapper around the standard Windows UI components. One of the classes is a sortable listview control. I've been using WTL with big Windows for more than 5 years -- you couldn't pay me to go back to MFC.
hi,
I have seen the WTL library and it seems very useful and time-saver, but I have a couple of questions about it:
1. can WTL 8.0 be installed with VC++ 6.0, specifically the appwizard stuff??how?? I see only javascript files of vc7.0 and 7.1 and 8.0!!
2. is there a good documentation about those classes??
Mohammad
I don't know about WTL 8; I'm still using WTL 7.5 with VS .Net 2003 for all my Win32 development. My guess is that it wouldn't work too well, as WTL is based on ATL, which has substantially changed between VC 6 and 7.
Good references for WTL include www.codeproject.com/wtl, and the WTL group over at Yahoo groups (reflected at www.gmane.org).
Hi!
I have an alphabetically sorted list of strings for the AutoCompleteTextView,
some strings have 2 words,
when I type a letter, I would that the autocomplete list that appear shows the strings sorted by the letter typed
for example:
I have this list alphabetically sorted: New Orleans, Omaha, Portland, Rome
now, if I type 'O', the first string in the autocomplete list, is New Orleans, the second Omaha,
but I would that Omaha is the first string because it start with 'O' and after New Orleans that doesn't
You should probably use a custom adapter and filter which sorts the results before returning them. Implement Filterable in your custom adapter, subclass http://developer.android.com/reference/android/widget/Filter.html, which does the filtering and calls Comparator.sort before returning any results. When getFilter() is called on your adapter, return an instance of your Filter subclass.
thank you for the answer,
I have solved the problem modifying the code of ArrayAdapter
can you please post a sample source for the filter part?
i have a custom adapter in the list and i need to implement filter on it.
Can you please let me know how this is achieved? I am having the same issue and could not be able to find the solution
I'm developing a simple android application using the TabActivity.
This Activity adds 3 tabs, each one with its own activity.
The problem is: when I tap each tab, the system calls onDestroy of the current activity. So, when I tap the first activity again, all the state of private fields are gone, its like it has created a new instance every time I change tabs.
I was searching around about this, and looking on the samples, but I guess that the default behavior is to keep the activity instances paused when the tab is not current.
Anyone have an idea of what I'm missing?
Thanks.
That is by design. You need to override onSaveInstanceState() and onRestoreInstanceState() in your activity class. You can store/retrieve state data there, or retrieve it int the Bundle passed into OnCreate(). See:
http://developer.android.com/reference/android/app/Activity.html#onCreate(android.os.Bundle)
The app I'm developing has a number of master-detail scenarios using the standard design-pattern. In a detail activity I need to indicate to the listview activity that an update/delete has occurred. This so that I can update the list using the adapter's setNotifyChange method. The list activity uses a callback to its parent activity where a decision is made about type of device ie; Is it a 'twoPane' scenario? This activity then calls the Fragment passing a reference to the selected row to the detail activity so it can be updated/deleted. I've tried creating a callback from this detail activity to the listview activity but this doesn't work. I assume that is because the detail activity was not invoked directly from the list activity, but from the activity containing the device decision. Maybe I'm missing something obvious. but does anyone have any suggestions for a solution.
Thanks for any help.
javabiker said:
The app I'm developing has a number of master-detail scenarios using the standard design-pattern. In a detail activity I need to indicate to the listview activity that an update/delete has occurred. This so that I can update the list using the adapter's setNotifyChange method. The list activity uses a callback to its parent activity where a decision is made about type of device ie; Is it a 'twoPane' scenario? This activity then calls the Fragment passing a reference to the selected row to the detail activity so it can be updated/deleted. I've tried creating a callback from this detail activity to the listview activity but this doesn't work. I assume that is because the detail activity was not invoked directly from the list activity, but from the activity containing the device decision. Maybe I'm missing something obvious. but does anyone have any suggestions for a solution.
Thanks for any help.
Click to expand...
Click to collapse
After thinking more about this problem I came to the idea that creating a callback path thru the various classes involved was worth trying. Will publish the results.
Have you ever used an EventBus? Like Otto from Square? https://square.github.io/otto/
There's also, https://github.com/greenrobot/EventBus. I prefer Otto.
You just register your Fragments/Activities on onResume and unregister on onPause.
Thanks for the suggestion. Coincidently, I'd been looking at Otto without realizing its applicability to this issue. Will give it a try.
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