Is there any way we can set the combo box not focusable? Because every time I select an item from combo box (drop down list), the keyboard shows up and the text from drop down list can be edited. I can't find any property from property inspector to disable this up. Or maybe we can disable this one programmatically in which I don't know.
Consider using an Option Menu (unlike a Combo Box an Option Menu has no field which a user can type into - and therefore no unwanted appearance of the keyboard)
Dave
The default script for a combo box is a menuPick handler. Whether or not you use the functionality of that handler or not, you would add this line at the end of that handler:
Related
In delphi:
How can you respond to a key press when the current focus is on a radiogroup which does not have an onkeypress event. I was hoping to use the forms onkeypress event but it doesnt see to fire.
You can make this possible by setting the form's KeyPreview property to True.
However, I'm not sure you are actually doing things right, since this is a fairly uncommon problem.
You didn't write what keyboard shortcut you want to respond to. But please remember that
Letters are used to navigate the GUI. For instance, pressing A might select the &All radio button or click the &Add push button. Similarly, Alt+A does the same if the current control allows character input, allows you to open the &Add-ons menu item, etc.
If you want to add a proper shortcut like Ctrl+O, it is much better to use a TActionList with an action having this shortcut. This action can be mapped to menu items, buttons, etc., or simply exist in the background not being attached to any visual control. In very simple applications, you might want to use a stand-alone menu item with such a shortcut instead.
I created a form in Delphi.
Say I have a Form with a speedbutton with label "&Add" (underline A, as a keyboard shortcut), and a dbgrid (read-only state) (or other control like TButton).
Then I changed the focus to Dbgrid (dbgrid got a focus) (or to TButton).
Every time I press the a key on the dbgrid, the onClick method on the speedbutton triggers.
Sometime I need to disable it for a while for a reason, and then i enable it again.
How to disable the speedbutton shortcut?
And then how to enable it again?
The form is pressing the button when you press A because the button has expressed interest in that key, and nothing else on your form is accepting keystrokes. If you had an edit box on your form, and it had the input focus, then the button would not be triggered.
You can make a control indicate that it wants to receive keystrokes when it has the focus, but that generally happens when writing a custom control, where you have some idea of what the new control class should do when it receives keyboard input.
If you don't want the button to be triggered, you can disable it. Another option is to alter the OnClick event handler to check other conditions (such as whether the grid has focus) before performing the usual click-handling code.
You could disable the shortcut by changing the speed button's label from &Add to Add. Change it back when you need to enable the shortcut again.
Please note that specifying an accelerator character like that enables two shortcuts, one is just the key prefaced with the & and the other the same key with Alt. So, in your case they would be A and Alt+A. In the same way, eliminating the accelerator disables both shortcuts. So, keep in mind that with this method of disabling the shortcut you would be unable to trigger the button neither with A nor with Alt+A.
I have a Delphi 6 application that has a TJvListView control. I have a popup menu tied to that control via the control's PopupMenu property. What I would like to do is show a different popup menu based on which column the user had the mouse over when they right clicked, with the additional option to not show a popup menu at all if the current column does not need one. How can I do this?
Thanks to this detailed sample by Remy Lebeau on in-place editing in a TListView I know what row and column the mouse is over except for one wrinkle. The mouse down event where I determine the current row and column occurs after the popup menu is exited.
I now need to know two things. First, how can I get some event to fire before the popup menu shows after a right mouse click so I can record the current list view row and column and suppress the popup menu if I want to, and second, how I can show a different popup based on the current column. I am hoping to avoid having to write a bunch of mini-forms instead of using the TListView PopupMenu property and supporting code. Is there a simple solution, perhaps some fancy footwork in a sub-class I should create around TJvListView?
You could perform the detection in mousemove instead of mousedown/Click and change the popupmenu depending.
You also could remove any popupmenu and call the wished via p.pupup in mousedown as you desire.
Is there some easy way to customize a ComboBox from Delphi to make the dropdown button with the arrow invisible? I mean without a lot of custom-draw code.. Maybe there is some control specific windows flag to set.
If I understand you correctly, you want all the functionality of the cxDBLookupComboBox, just not the button.
Try this in the FormCreate:
cxDBLookupComboBox1.Properties.Buttons.Clear;
You can access other combo box buttons properties via non-published Buttons property just like that.
how can i make a TRibbonComboBox act like a TCombobox with Style of csDropDownList? we don't want the user to be able to edit the choices in the list.
we need to use TRibbonComboBox because we want the current selection to be visible.
Microsoft word shows a combobox where you can select an item but cannot edit the item itself.
should i consider trying a TCombobox in the ribbon? i'd expect it won't look or not work correctly.
thank you for you comments!
You can just use TRibbonComboBox.ReadOnly:
Determines whether the user can change the text of the edit control.
And furthermore:
Setting ReadOnly to true ensures that the text is not altered, while still allowing the user to select text. The selected text can then be manipulated by the application, or copied to the Clipboard.
(see documentation)