Dynamic Dialog
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From: Ramesh on 13 Jun 2005 07:45 I am fairly new to UI programming using VC++. I am looking for ways to modify a dialog box dynamically. In other words, I want to be able to add controls to an exisitng dialog during run time. This is a simple dialog which will be empty initially. Just before it is shown, I want to be able to add rows or columns of check boxes with static texts next to them, based on some strings read from the registry. Is this possible? How? Any code sample will be helpful. Thanks in advance
From: Scott McPhillips [MVP] on 13 Jun 2005 09:03 Ramesh wrote: > I am fairly new to UI programming using VC++. I am looking for ways to modify > a dialog box dynamically. In other words, I want to be able to add controls > to an exisitng dialog during run time. This is a simple dialog which will be > empty initially. Just before it is shown, I want to be able to add rows or > columns of check boxes with static texts next to them, based on some strings > read from the registry. Is this possible? How? Any code sample will be > helpful. Thanks in advance Yes, it is possible. Each of the control classes, such as CStatic and CButton, has a Create function. Call it in OnInitDialog to dynamically create the control. Use the ON_CONTROL_RANGE macro in your message map to dispatch messages from the dynamically created controls. You should also consider an easier way: You can put all the controls that might be needed onto the dialog template at design time. In OnInitDialog you can make each control visible or invisible by calling its ShowWindow function. -- Scott McPhillips [VC++ MVP]
From: Ramesh on 13 Jun 2005 09:01 Scott, Thanks very much for the quick reply. The reason I have to add them dynamically as opposed to during design time is because the number strings available in the registry is variable. If you can throw some light (i.e., sample code) on how to add the event handlers to the dynamically added controls that will be really helpful. I am not familiar with the ON_CONTROL_RANGE macro. Thanks again K. Ramesh "Scott McPhillips [MVP]" wrote: > Ramesh wrote: > > > I am fairly new to UI programming using VC++. I am looking for ways to modify > > a dialog box dynamically. In other words, I want to be able to add controls > > to an exisitng dialog during run time. This is a simple dialog which will be > > empty initially. Just before it is shown, I want to be able to add rows or > > columns of check boxes with static texts next to them, based on some strings > > read from the registry. Is this possible? How? Any code sample will be > > helpful. Thanks in advance > > Yes, it is possible. Each of the control classes, such as CStatic and > CButton, has a Create function. Call it in OnInitDialog to dynamically > create the control. Use the ON_CONTROL_RANGE macro in your message map > to dispatch messages from the dynamically created controls. > > You should also consider an easier way: You can put all the controls > that might be needed onto the dialog template at design time. In > OnInitDialog you can make each control visible or invisible by calling > its ShowWindow function. > > -- > Scott McPhillips [VC++ MVP] > >
From: Scott McPhillips [MVP] on 13 Jun 2005 17:54 Ramesh wrote: > Scott, > > Thanks very much for the quick reply. The reason I have to add them > dynamically as opposed to during design time is because the number strings > available in the registry is variable. > > If you can throw some light (i.e., sample code) on how to add the event > handlers to the dynamically added controls that will be really helpful. I am > not familiar with the ON_CONTROL_RANGE macro. > > Thanks again > > K. Ramesh If you know the maximum number of strings then dynamic creation is not necessary. Just put the maximum number on the resource template. The number of controls that you make visible can be dynamic (and the size of the dialog can be dynamic). To handle a message from dynamically created controls you first select an unused range of ID values to be used for the controls. Define them in resource.h: #define IDC_RADIO_0 2000 #define IDC_RADIO_4 Add to message map: .... ON_CONTROL_RANGE(BN_CLICKED, IDC_RADIO_0, IDC_RADIO_4, OnClickedRadio) END_MESSAGE_MAP() void CSomeView::OnClickedRadio(UINT nID) { } -- Scott McPhillips [VC++ MVP]
From: Ramesh on 13 Jun 2005 23:34
I will try out your suggestion Scott, thanks. But then, the resource IDs should already have been defined during design time, right? Is there no way we can define the whole thing during run time i.e., adding the control, defining the resource ID, assigning event handler, etc (I guess not)? "Scott McPhillips [MVP]" wrote: > Ramesh wrote: > > > Scott, > > > > Thanks very much for the quick reply. The reason I have to add them > > dynamically as opposed to during design time is because the number strings > > available in the registry is variable. > > > > If you can throw some light (i.e., sample code) on how to add the event > > handlers to the dynamically added controls that will be really helpful. I am > > not familiar with the ON_CONTROL_RANGE macro. > > > > Thanks again > > > > K. Ramesh > > If you know the maximum number of strings then dynamic creation is not > necessary. Just put the maximum number on the resource template. The > number of controls that you make visible can be dynamic (and the size of > the dialog can be dynamic). > > To handle a message from dynamically created controls you first select > an unused range of ID values to be used for the controls. Define them > in resource.h: > #define IDC_RADIO_0 2000 > #define IDC_RADIO_4 > > Add to message map: > .... > ON_CONTROL_RANGE(BN_CLICKED, IDC_RADIO_0, IDC_RADIO_4, OnClickedRadio) > END_MESSAGE_MAP() > > void CSomeView::OnClickedRadio(UINT nID) > { > > } > > -- > Scott McPhillips [VC++ MVP] > > |