Entry No.
671
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VCL - Win32 - ComCtrls - TDateTimePicker
If you enable checkboxes (by setting ShowCheckbox := True),
and then try to change the date value either by the up/down keyboard
arrow keys, or using up/down buttons (if DateMode = dmUpDown),
the date will be changed one step but focus will then be transferred to
the checkbox.
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| 1.02 |
2.01 |
3.0 |
3.01 |
3.02 |
4.0 |
4.01 |
4.02 |
4.03 |
5.0 |
5.01 |
6.0 |
6.01 |
6.02 |
Kylix 1.0 |
| N/A | N/A | Unknown | Unknown | Exists | Exists | Exists | Exists | Exists | Exists | Exists | Exists | Unknown | Unknown | N/A |
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Description | |
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Reported by Björn Lindell; checked by Jordan Russell
If you enable checkboxes (by setting ShowCheckbox := True),
and then try to change the date value either by the up/down keyboard
arrow keys, or using up/down buttons (if DateMode = dmUpDown),
the date will be changed one step but focus will then be transferred to
the checkbox. After that if you press up/down (either through keys or
button),
the date will not change. You need to click in the datetimepicker-control
again to give it focus again, but then you still can only change one step
before
losing focus again.
I compared this with the behaviour in the Find Message function in Outlook
Express 5.x (which exposes checkboxes for date ranges), there is no problem
there.
The offending code seems to be in "comctrls.pas" in
procedure TDateTimePicker.CNNotify(var Message: TWMNotify);
probably something of the code under the case-clause DTN_DATETIMECHANGE: |
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Solution / workaround | |
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I managed to create a workaround by making a subclass and reimplementing a
stripped down version of CNNotify (basically copying the code and removing
stuff),
but since it uses a lot of private variables, I mainly had to remove code,
so I am not
sure what possible side effects this may have. The best course would be to
modify the
ComCtrls.pas code itself, but since I don't want to use a recompiled version
of this
unit (since I fear that the precompiled version may not be in synch) I have
not tried this.
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User-contributed comments | |
M. Biedermann
30 Jul 2002 01:33 PM GMT |
Bug still exists in Delphi 6.02
Furthermore, with ShowCheckbox = False, the control will no longer get a visible focus when you once used the DropDown Calendar (even if you ESC out of it).
It seems the now invisible Checkbox gets the focus. You can bring it back to the date area by using CursorLeft/Cursor Right.
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