dxBarDateCombo

Aleksey Schibaev

created 10 years ago (modified 10 years ago)

Hello

I need some help with TdxBar DateCombo component.
This component has no methods for validation. What way am I able to check value of this control?

For example, user clears value of the control, so dxBar DateCombo.Date will be -7000 after it. But is's necessary to prevent changing and show message for user (like this 'Invalid DateTime Value!'). Is it possible?

And the another question about incorrect value of the control. Can i check value before message 'Could not convert variant of type (UnicodeString) into type (Date)' will be shown?

Comments (1)

Aleksey Schibaev 10 years ago

19 hours late. Do somebody answer me?

Answers approved by DevExpress Support

DevExpress Support Team

created 10 years ago

Hello Aleksey,

I think that it is more convenient in your scenario to use the TcxBarEditItem item with Properties = DateEdit. This editor has the Properties.OnValidate event that you can use to validate the date value similarly to how it can be done in our standalone editors.

Show previous comments (5)

Aleksey Schibaev 10 years ago

So there are no ways to validate value of TdxBarDateCombo control, right? But it's a bit weird. The special datetime control for dxRibbon, if fact, absolutely useless.

DevExpress Support Team 10 years ago

TdxBarDateCombo is not a special control for dxRibbon. It is a very old control that is designed for standalone Office 2000 - like bars and is present in the ribbon UI mostly for backward compatibility. If its functionality is OK for your project, you may use it. However, if its features are not enough, I suggest that you use a more modern TcxBarEditItem with Properties = DateEdit.

Aleksey Schibaev 10 years ago

Ok, I see , thank you. Then another question.
Could you show me the best way to get and set value to TcxBarEditItem with Properties = DateEdit, please?
I created two functions:
// Setting value
procedure TDM.SetTimeToBarEditItem(aBarEditItem: TcxBarEditItem; aDate: TDateTime);
var
LItemControl: TcxBarEditItemControl;
LDateEdit: TcxDateEdit;
begin
aBarEditItem.SetFocus;
LItemControl := TcxBarEditItemControl(aBarEditItem.Links[0].Control);
LDateEdit := TcxDateEdit(LItemControl.Edit);
LDateEdit.Date := aDate;
end;
//Getting value
function TDM.GetTimeFromBarEditItem(aBarEditItem: TcxBarEditItem): TDateTime;
var
LItemControl: TcxBarEditItemControl;
LDateEdit: TcxDateEdit;
begin
aBarEditItem.SetFocus;
LItemControl := TcxBarEditItemControl(aBarEditItem.Links[0].Control);
LDateEdit := TcxDateEdit(LItemControl.Edit);
Result := LDateEdit.Date;
end;
It works, but i don't like it.

Aleksey Schibaev 10 years ago

I create small sample project (attached). Please explain me, why, if i clear control's value, OnValidate method works twice (so, i see my ErrorText two times)?
And why error 'Control '' has no parent window' is displayed?

dxSample.rar

Aleksey Schibaev 10 years ago

Is my question so small and trivial? (

DevExpress Support Team 10 years ago

Aleksey,

Usually we answer incoming inquiries within 24 hours (one business day), with the exception of messages received immediately before the weekend or during holidays. We appreciate your patience.

The best way to get/set the TcxBarEditItem items's value is to use the TcxBarEditItem.EditValue property. For example:

Delphi
cxBarEditItem1.EditValue := EncodeDate(2015, 1, 1);

I have reproduced the error message appearing twice and will discuss this scenario with our developers;
Would you please provide us with the step-by-step instructions on how to reproduce the 'Control '' has no parent window' error with your project?

Aleksey Schibaev 10 years ago

Ok, EditValue is good for properties = DateEdit. But what should i do with properties = CheckComboBox, for example? ) Or some other controls like CheckGroup?
Ok, thank you.
Just clear value of Control. After loosing focus there are two exceptions with my text ('Error') and then exception 'Control…' is displayed. Don't you have it?

DevExpress Support Team 10 years ago

Aleksey,

EditValue allows you to set a value for TcxBarEditItem with any properties. Please review the TcxBarEditItem with TcxCustomCheckGroupProperties ticket to see how to accomplish this task with CheckComboBox.
Thank you for your clarification. I have reproduced this error too. It seems that the OnValidate event does not work as I expected. I have created a separate ticket (dxBarDateCombo - the OnValidate event does not work as expected) and forwarded it to our developers for research.

Created: March 16, 2015 12:34 PM

Modified: March 18, 2015 2:26 PM

Platform: VCL

Product: ExpressBars Suite

Build: 14.2.3

IDE: Embarcadero Delphi XE2

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dxBarDateCombo

Answers approved by DevExpress Support

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