I create a custom combobox that has a custom listbox. The default listbox of combobox is replaced by using this code:
m_comboBoxInfo.cbSize = sizeof(COMBOBOXINFO);
if (::GetComboBoxInfo(m_hWnd, &m_comboBoxInfo)){
m_ListBox.SubclassWindow(m_comboBoxInfo.hwndList);
}
I want the new drop-down list of the combobox is showed always, even if it loses focus or user clicks to other controls.
I tried to capture WM_CAPTURECHANGED and WM_KILLFOCUS at WindProc() function to do nothing.
LRESULT CCustomListBox::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == WM_CAPTURECHANGED ||
message == WM_KILLFOCUS){
return TRUE;
}
return CCustomListbox::WindowProc(message, wParam, lParam);
}
However, it not work. Could you please show me how to prevent closing dropdown listbox when it loses focus on.
My combobox looks like this.
I want the new drop-down list of the combobox is showed always, even if it loses focus or user clicks to other controls.
I want to make a combobox that its dropdown list is closed when the user clicks to the combobox button.
With these requirements, I would get rid of the combobox altogether and instead just combine an edit control, a button and a listbox. You would have full control over everything without having to fight against standard combobox logic. Even if you would get a "hack" working now, it is very likely to break in future Windows versions.
Simply toggle the listbox's show state when the button is pressed. React to selection change event of the listbox to update the text in the edit control.
I would group these controls in a parent control that at least has the WS_CHILD|WS_TABSTOP and WS_EX_CONTROLPARENT window styles set. The latter is important to enable keyboard navigation into and out of the child controls as if the parent control doesn't exist. The "group" control will also encapsulate the notifications from the button and list control (as these are implementation details not intended for the parent of the group control).
You could even emulate notification messages of a regular combobox by sending WM_COMMAND messages to the parent of your "group" control.
Related
I'm working with VB6.
I have several forms and i need open a form. This form have a UserControl.
My problem is setfocus in a element of UserControl inside this form.
Sub Form_Activate()
Ctrl_User.MyTextbox.SetFocus
End Sub
but don't run
How i can do it??
Thanks
Have you tried this:
Sub Form_Activate()
Ctrl_User.Enabled = True
Ctrl_User.MyTextbox.SetFocus
End Sub
Also maybe you may need to review this here as well it may help you more:
If you're authoring a user-drawn control, there won't be any
constituent controls on your UserControl. If you don't want your
control to be able to receive the focus, set the CanGetFocus property
of the UserControl object to False. CanGetFocus is True by default.
If your user-drawn control can receive the focus, the UserControl
object will receive GotFocus and LostFocus events when your control
receives and loses the focus. A user-drawn control is responsible for
drawing its own focus rectangle when it has the focus, as described in
"User-Drawn Controls," in this chapter.
This is the only function your UserControl's GotFocus and LostFocus
events need to fulfill for a user-drawn control. You don't need to
raise GotFocus or LostFocus events for the user of your control,
because the container's extender provides these events if the
CanGetFocus property is True.
https://msdn.microsoft.com/en-us/library/aa241743(v=vs.60).aspx
In my application I have a multi step form wizard in which
the next button is disabled unless all the required fields are entered.
Some fields require extra validation such as the directory picker,
for which I have to check whether the directory exists or not.
To ease the user experience I need to show an "Invalid directory" tooltip
next to the directory text field.
I would like to show the tooltips when the user tries to click/enter the disabled
next button.
Is it possible to capture events performed on a disabled button in JavaFX?
public void nextEntered(Event event) {
Button button = (Button)event.getSource();
if(button.isDisabled()){
validate(currentTab);
}
}
I had a similar problem where I wanted to show a tooltip of a disabled field's value when the user moused over that disabled field.
I ended up putting a blank label over the disabled field and attaching a mouse event to that.
In the case of a button, you can just give the dummy label mouse transparency when the button becomes enabled so the user can click the button.
(You might even be able to bind the label's mouse transparency property to the button's enabled property but I'm not sure.)
I know this was asked a year ago but maybe it will help someone else.
Is there any notification message for WinAPI combo box controls we can use to know when the current item is changed while moving the mouse pointer over the drop-down list box?
My expectation is that the CBN_SELCHANGE notification should work for the mouse too, but unfortunately it is sent only when we change the selection using the keyboard or click an item with the mouse.
Listen for WM_DRAWITEM in your WndProc, and use the DRAWITEMSTRUCT to determine the selection.
I have a XAML ListBox, a TextBox inside the ItemTemplate. A user edits text inside the TextBox, and then presses a button in the application bar. How do I keep the focus on the TextBox after the button in the application bar was pushed?
You don't. You set it back afterwards.
You can use Focus() method to do this.
You can also use the SelectionStart and SelectionLength to highlight a specific part of the text.
I'm writing some code and I need to get the window handle of the listbox associated with a combo box. When looking in spy++, it looks like the parent of the listbox is the desktop, not the combo box. How can I programmatically find the listbox window handle?
Send CB_GETCOMBOBOXINFO to the combo box, and it fills in a COMBOBOXINFO structure, which contains the window handles to the edit control and the list box control.