[Bug 123516] Undocumented and cumbersome css.ui.dialogs.ColorPicker

[bugzilla]

https://issues.apache.org/ooo/show_bug.cgi?id=123516

--- Comment #8 from Ariel Constenla-Haile <arie...@apache.org> ---
The second draft hides the dialog's implementation details by using two
interfaces:

css::ui::dialogs::XControlInformation;
css::ui::dialogs::XControlAccess;

Showing a color picker, displaying the original color, can be done with the
following Basic code:

Sub ColorPicker_PreviousColor
Dim oWin as Object
oWin = ThisComponent.getCurrentController().getFrame().getContainerWindow()

Dim oDlg
oDlg = com.sun.star.ui.dialogs.ColorPicker.create(oWin, RGB(255,0,0))

oDlg.setTitle("Color Picker Demo")
oDlg.setControlProperty("PreviousColor","Visible",True)

Dim nResult%
nResult = oDlg.execute()
If nResult = com.sun.star.ui.dialogs.ExecutableDialogResults.OK Then
    Dim nColor as Long
    nColor = oDlg.SelectedColor
    MsgBox "Selected color:  RGB(" & _
        CStr(Red(nColor)) & "," & _
        CStr(Green(nColor)) & "," & _
        CStr(Blue(nColor)) & ")"
End If
End Sub

Instead of using strings ("PreviousColor","Visible"), it would be better to use
constants, like the FilePicker does (XFilePickerControlAccess with
CommonFilePickerElementIds, ExtendedFilePickerElementIds). But for now the
color picker only exposes one control (original color preview) with one
property (visible).

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