Implement one-choice checkbox in clistctrl

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• Ajay Kalra posted on Wednesday, January 14,200 9 AM
• Asoni1 posted on Tuesday, January 13,200 9 pm
• Ian Semmel posted on Tuesday, January 13,200
• Tom serface posted on Tuesday, January 13,200 9
• Asoni1 posted on Wednesday, January 14,200 9 AM
• Sanoop das K posted on Saturday, February 28,200 9 pm

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detect changes in clistctrl control with checkboxajay Kalra posted on Wednesday, January 14,200 9 AM On Jan 13, 11: 31 = a0am, asoni12 Take A Look At listview_getcheckstate: http://msdn.microsoft.com/en-us/lib=rary/bb761250 (vs.85 ). aspxand lvn_itemchanging: http://msdn.microsoft.com/en-us/library/bb774847 (. = 85 ). aspx -- Ajay reply

detect changes in clistctrl control with checkboxasoni1 posted on Tuesday, January 13,200 9 Hi Ajay, thanks for the quick reply. we get a pointer to an nmlistview structure in case of both errors and lvn_itemchanged Event Handlers but with this structurehow can we make sure whether items â € S checked/unchecked state has beentoggled or something else has changed? I mean is there any bit in this structure member which is set/unset when thestate gets toggled? reply

In the lvn_itemchanged handler you can putint NS = pnmlistview-> unewstate & Ian Semmel posted on Tuesday, January 13,200 In the lvn_itemchanged handler you can putint NS = pnmlistview-> unewstate & lvis_stateimagemask; If (NS & 0x2000 )! = 0) // checkbox setelse if (NS & 0x1000 )! = 0) // checkbox unsetelse // something else happened Reply

Detect changes in clistctrl control with checkboxtom serface posted on Tuesday, January 13,200 9 On_policy (nm_click, idc_list, & cspanrestoredlg: onnmclicklist) // check or uncheck item. if more than one item is selected then use theone from the // hit test to determine how we are setting the others (I. E ., if it is offwe turn the other // selected ones on ). void cmydlg: onnmclicklist (nmhdr * pnmhdr, lresult * presult) {nmlistview * pnmlistview = (nm_listview *) pnmhdr; lvhittestinfo hitinfo; * presult = 0; B OOl bchecked = false; // copy click pointhitinfo.pt = pnmlistview-> ptaction; // make the hit test...int nitem = m_clist.hittest (& hitinfo); If (hitinfo. Flags! = Lvht_onitemstateicon) return; // didn't click on an iconif (m_clist.getitemstate (nitem, lvis_selected )! = Lvis_selected) {// They clicked on one that is not selected... just change it //... do something herebchecked = m_clist.getcheck (nitem); bchecked =! Bchecked; m_clist.setcheck (nitem, bchecked); * presult = 1; return;} // get the checked state from the one they clicked on, but change allthe ones that are selecteduint uselectedcount = m_clist.getselectedcount (); // update all of the selected items. if (uselectedcount> 0) {nitem =-1; m_clist.setredraw (false); For (uint I = 0; I <uselectedcount; I ++) {nitem = m_clist.getnextitem (nitem, lvni_selected); m_clist.setcheck (nitem, bchecked);} * presult = 1; m_clist.invalidate (); m_clist.setredraw ();} Tom Reply

Thanks Ian. asoni1 posted on Wednesday, January 14,200 9 AM Thanks Ian. I did it this way and it works fine for me-I just wanted to confirm, since I am using constant 0x2000 and 0x1000 here, can I be sure that these checks will not be bricked in some other environmentlike other version of Windows OS or Visual Studio? Int oldstate =-1; int newstate =-1; int changedstate =-1; int NS1 = pnmlv-> uoldstate & lvis_stateimagemask; int int32 = pnmlv-> unewstate & lvis_stateimagemask; if (NS1 & 0x2000 )! = 0) // find the previous state {// checkbox setoldstate = 1;} else if (NS1 & 0x1000 )! = 0) {// checkbox unsetoldstate = 0;} If (-1! = Oldstate) // If got the previous state then find the new State {If (NS2. 0x2000 )! = 0) {// checkbox setnewstate = 1;} else if (NS2. 0x1000 )! = 0) {// checkbox unsetnewstate = 0;} If (-1! = Newstate) & (oldstate! = Newstate) {changedstate = newstate-oldstate; if (1 = changedstate) {afxmessagebox (_ T ("item has been checked "));} else if (-1 = changedstate) {afxmessagebox (_ T ("item has been unchecked "));}}} Reply

Detect changes in clistctrl control with checkboxsanoop das K posted on Saturday, February 28,200 9 pm Http://msdn.microsoft.com/en-us/library/bb761250.aspx===========================

Through the classwizard attribute page or wizardbar, classwizard can create an on_notify message ing entity and provide a processing function body. For more information about classwizard, seeMapping messages to functions of Visual C ++ programmer's guide.

On_notify message ing macro format:

On_policy (wnotifycode, ID, memberfxn)

Wnotifycode

TheCode, Such as lvn_keydown.

ID

ID of the control that sends the reminder message

Memberfxn

Reminder Message Processing Function

The prototype of the processing function is as follows:

Afx_msg void memberfxn (nmhdr * pnotifystruct, lresult * result );

Pnotifystruct

Parameter struct described above

Result

Return code that should be set before function return

Example

To enable the onkeydownlist1 function to process the lvn_keydown message sent by clistctrl whose ID is idc_list1, you can use classwizard to add the following code to the Message ing:

On_policy (lvn_keydown, idc_list1, onkeydownlist1)

The function body provided by classwizard is:

Void cmessagereflectiondlg: onkeydownlist1 (nmhdr * pnmhdr, lresult * presult)

{

Lv_keydown * plvkeydow = (lv_keydown *) pnmhdr;

// Todo: add your control notification Handler

// Code here

* Presult = 0;

}

Note: classwizard automatically provides parameter pointers. You can directly use pnmhdr or plvkeydow to access the reminder struct.

On_policy_range
To process the same wm_notify message for a group of controls, you can use on_policy_range instead of on_policy. For example, a group of buttons can perform the same operation for a notification message.

When on_policy_range is used, you must specify a group of consecutive control IDs to specify the start ID and end ID of the control group.

Classwizard does not process on_policy_range. to use it, you need to manually add message ing.

The message ing entity and function of on_policy_range are as follows:

On_policy_range (wnotifycode, ID, idlast, memberfxn)

Wnotifycode

The code of the reminder message to be processed, such as lvn_keydown.

ID

Start ID of the control group

Idlast

End ID of the control group

Memberfxn

Reminder Message Processing Function

The prototype of the processing function is as follows:

Afx_msg void memberfxn (nmhdr * pnotifystruct, lresult * result );

Pnotifystruct

Parameter struct described above

Result

Return code that should be set before function return

On_policy_ex, on_policy_ex_range
If you want to process reminder messages by multiple objects, you can use on_policy_ex (or on_policy_ex_range) instead of on_policy (or on_policy_range ). The difference between the ex version and the conventional version is that the ex version of the processing function has a bool type return value to determine whether the message processing should continue. If false is returned, the message can be processed by multiple objects.

Classwizard does not process on_policy_ex or on_policy_ex_range. to use them, you need to manually add message ing.

The message ing entity and function prototype of on_policy_ex and on_policy_ex_range are issued. The parameter meanings are consistent with those of the general version:

On_policy_ex (ncode, ID, memberfxn)

On_policy_ex_range (wnotifycode, ID, idlast, memberfxn)

Both functions are prototype:

Afx_msg bool memberfxn (uint ID, nmhdr * pnotifystruct, lresult * result );

Id indicates the ID of the control that sends the reminder.

If the reminder message has been processed, the function should return true; otherwise, if further processing is required, the function returns false.

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