I want to know that whether I can add a textbox or label by changing the options in combo box. For example, I have 2 options in Combobox. If I choose the #1, it must show me 2 textboxes, but if I choose #2 it must show 3 textboxes.Can I do something like this in Visual Studio C++?
This can be done in two ways:
Dynamically create and destroy the edit controls using CreateWindowEx and DestroyWindow.
Statically create your GUI with 3 edit controls and set the visibility of the controls based on the selection using ShowWindow.
Have as many text-boxes you want. But hide them.
Handle CBN_SELCHANGE (ON_CBN_SEL_CHANGE in MFC).
In the handler, show (or hide) the text boxes depending on selection.
Showing/hiding text boxes aren't good from UI perspective. You better enable/disable them appropriately. You may put alternate text when they are disabled, and bring back original change when they have to be enabled.
Creating textboxes at runtime, and then deleting them isn't' good approach. You will need to keep track of Win32 UI handle and/or MFC object. This approach will also need more of UI resource creation/deletion, parent-child relationship handling et. al.
Related
I'm writing a GUI using QT for embedded system with linux. This device has no mouse. Only display and specific keyboard with keys: up, down, return and 7 number keys.
The software will be used to set some parameters of device and read them (some charts also).
Example of how menu could look:
after OPTION 1 selected
After SUBOPTION 1 selected some table with data is loaded.
Sometimes after selecting option i need to load specific widget and sometimes just another set of options.
I think it is possible to implement custom labels and kind of list widget that aligns them.
I guess it is also possible to use Qt's MVC classes for it. They are highly customizable, but i never made custom views and delegates.
Maybe i just need to create QtListView with stringlist model and apply stylesheet to it so it gets look more like buttons. And based on selection in list load next widget.
Which way is better and why?
Is there any easier ways to accomplish this?
Any ideas would be appreciated.
I would like to disable an item in a combobox in my Win32 application (C++). I'm not quite sure how to do this. I'm trying to achieve something that looks like this:
Notice how CollectionItem2 and 3 are greyed-out.
Any help would be very much appreciated!
If you truly need a combobox for this, then (as #IInspectable said) you'll need to do a custom drawn control. Basically, you'll have to store some information saying which items are disabled/grayed, and draw the items appropriately based on whether they're enabled or not.
There may be a somewhat easier way though. This is normally done with a Split Button. This is button with the BS_SPLITBUTTON style set. When the drop-down part of the button is clicked, it sends a BCN_DROPDOWN notification.
You normally respond to that by displaying a menu, typically using TrackPopupMenu to display it immediately below the button (or immediately to its right, if you prefer). This is a normal menu, so it can have items enabled, disabled, grayed, have check boxes, etc., as you see fit.
If you're using MFC, it has a CSplitButton class that wraps the Split Button, simplifying the code a little bit--you can pass an identifier of a menu and sub-menu when you create the CSplitButton object, and it handles things from there.
A sample result probably looks pretty familiar:
Note: MFC also has a CMfcMenuButton class. This has roughly similar functionality, but is somewhat clumsier to use. If memory serves, it is compatible with older versions of Windows (but the split button goes back to Vista, so it's fine unless you really need to support XP).
Does CheckedListBox::Enable() to enable/disable items should behave like GetDlgItem(checkedbox)->EnableWindow(False), for a simple checkedbox, I mean for the last one, the item has the aspect of a disabled item, but for checkedlistbox the item has a normal aspect but I can't select it.
So is this normal for disable items from a CheckedListBox to not have a gray aspect?
Try to avoid using GetDlgItem
CCheckedListBox::Enable() is used to enable and disabled the individual checkbox in the list based on the index you pass into it.
EnableWindow is intended to enable or disable the entire control. In the case of a checkbox I would expect these to be similar however the CCheckedListBox may handle how it manages it's check box list items differently than how an independent checkbox control would behave.
You can probably override DrawItem and use owner drawn style if you want to do something different than the default behavior when updating visual aspects.
Developing using Visual Studio 2010 C++ and MFC. I want to create an options (preferences/settings) dialog box that can display several options. After considering many different options dialog box UIs I think I like the listbox-with-multiple-pages-style similar to visual studio's option dialog box (but I don't need the treeview, a list box is fine).
What's a good way to implement this? Do I use a CListBox and then handle the selection event to load up the individual pages? I'm new to MFC, what would the individual pages even be? Something like a panel? Ideally I would design them in the resource editor and then be able to load them up.
Take a look at http://www.codeproject.com/KB/dialog/embedded_dialog.aspx for one possible way of doing this.
The individual property pages can be designed as dialogs in the resource editor, and then the relevant page can be displayed in your main dialog depending on the selection in the list box, by handling the LVN_ITEMCHANGED message.
See CPropertySheet and CPropertyPage classes. This allows you to easily manage a properties window with several views.
I have a CListCtrl with checkboxes. I want to be able to disable one of the items so that the user cannot click the checkbox. Is this possible? If so, how?
Edit:
Found the specifics on how to hide a checkbox in another question
Need only some rows in a CListCtrl control to have check boxes
Shortly: Not easily possible.
You'll need to sub-class the CListCtrl and implement this behavior on your own or download for example the MFC Grid Control that allows you to do that.
As for the removing check-boxes idea, yes, that might be possible, MSDN:
Version 4.70. Enables check boxes for items in a list-view control. When
set to this style, the control creates
and sets a state image list with two
images using DrawFrameControl. State
image 1 is the unchecked box, and
state image 2 is the checked box.
Setting the state image to zero
removes the check box.