Spinner

The Spinner is a composite control that consists of an increment button, a decrement button, and an edit control, all of which are used to provide decimal values to the application.

• Details
• Spinner Properties
• Remarks
• Related topics

Details

The following screen shot illustrates the Ribbon Spinner.

Spinner Properties

The Ribbon framework defines a collection of property keys for the Spinner control.

Typically, a Spinner property is updated in the ribbon UI by invalidating the Command associated with the control through a call to the IUIFramework::InvalidateUICommand method. The invalidation event is handled, and the property updates defined, by the IUICommandHandler::UpdateProperty callback method.

The IUICommandHandler::UpdateProperty callback method is not executed, and the application queried for an updated property value, until the property is required by the framework. For example, when a tab is activated and a control revealed in the ribbon UI, or when a tooltip is displayed.

The following table lists the property keys that are associated with the Spinner control.

The following section of code demonstrates how various properties of the Spinner control are updated in the IUICommandHandler::UpdateProperty method.

//
//  FUNCTION:    UpdateProperty()
//
//  PURPOSE:    Called by the Ribbon framework when a command property needs 
//                to be updated.
//
//  COMMENTS:    This function is used to provide new command property values for 
//                the spinner when requested by the Ribbon framework.  
//    
STDMETHODIMP CCommandHandler::UpdateProperty(
    UINT nCmdID,
    REFPROPERTYKEY key,
    const PROPVARIANT* ppropvarCurrentValue,
    PROPVARIANT* ppropvarNewValue)
{
    UNREFERENCED_PARAMETER(ppropvarCurrentValue);

    HRESULT hr = E_NOTIMPL;

    if (nCmdID == IDR_CMD_SPINNER_RESIZE)
    {
        // Set the minimum value
        if (IsEqualPropertyKey(key, UI_PKEY_MinValue))
        {
            ZeroMemory(ppropvarNewValue, sizeof(*ppropvarNewValue));
            ppropvarNewValue->vt = VT_DECIMAL;
            VarDecFromR8(-10.0, &ppropvarNewValue->decVal);
            hr = S_OK;
        }

        // Set the maximum value
        else if (IsEqualPropertyKey(key, UI_PKEY_MaxValue))
        {
            ZeroMemory(ppropvarNewValue, sizeof(*ppropvarNewValue));
            ppropvarNewValue->vt = VT_DECIMAL;
            VarDecFromR8(10.0, &ppropvarNewValue->decVal);
            hr = S_OK;
        }

        // Set the increment
        else if (IsEqualPropertyKey(key, UI_PKEY_Increment))
        {
            ZeroMemory(ppropvarNewValue, sizeof(*ppropvarNewValue));
            ppropvarNewValue->vt = VT_DECIMAL;
            VarDecFromR8(2.0, &ppropvarNewValue->decVal);
            hr = S_OK;
        }

        // Set the number of decimal places
        else if (IsEqualPropertyKey(key, UI_PKEY_DecimalPlaces))
        {
            hr = InitPropVariantFromUInt32(1, ppropvarNewValue);
            hr = S_OK;
        }

        // Set the format string
        else if (IsEqualPropertyKey(key, UI_PKEY_FormatString))
        {
            hr = InitPropVariantFromString(L"px", ppropvarNewValue);
            hr = S_OK;
        }

        // Set the representative string
        else if (IsEqualPropertyKey(key, UI_PKEY_RepresentativeString))
        {
            hr = InitPropVariantFromString(L"AAAAAAA", ppropvarNewValue);
            hr = S_OK;
        }
    }
    return hr;
}

Remarks

If the minimum value (UI_PKEY_MinValue) of a Spinner is initialized to 0.0, the application should ensure that any subsequent value supplied by the control does not equal -0.0 (negative zero). If the Spinner supplies a value of -0.0, the application should reset this value to 0.0 (positive zero) using the IUIFramework::SetUICommandProperty method as shown in the following example of an IUICommandHandler::Execute method for a Spinner control.

//
//  FUNCTION:    Execute()
//
//  PURPOSE:    Called by the Ribbon framework when a command is executed by the user.  
//                For this sample, when an increment or decrement button is pressed or
//                a new value is entered in the Spinner edit field.
//
STDMETHODIMP CCommandHandler::Execute(
      UINT nCmdID,
      UI_EXECUTIONVERB verb,
      const PROPERTYKEY* key,
      const PROPVARIANT* ppropvarValue,
      IUISimplePropertySet* pCommandExecutionProperties)
{
    UNREFERENCED_PARAMETER(pCommandExecutionProperties);

    HRESULT hr = E_NOTIMPL;

    if (verb == UI_EXECUTIONVERB_EXECUTE)
    {
        RenderParam param;
        g_renderer.GetRenderParam(&param);

        if (nCmdID == IDR_CMD_SPINNER_RESIZE)
        {
            // Spinner value is negative.
            if (!(ppropvarValue->decVal.sign == 0))
            {
                // Check if the value supplied by the Spinner is -0
                // and correct the value if necessary.
                // If this value is left uncorrected, the edit field 
                // of the control will display the string "Auto" when 
                // UI_PKEY_MinValue is set to 0.
                if (ppropvarValue->decVal.Lo64 == 0)
                {
                    // Initialize a new PROPVARIANT structure.
                    PROPVARIANT m_varNewVal;
                    PropVariantInit(&m_varNewVal);

                    // The replacement DECIMAL value.
                    DECIMAL m_dVal;
                    hr = VarDecFromI4(0, &m_dVal);
                    if (FAILED(hr))
                    {
                        return hr;
                    }
                    
                    // Initialize the new DECIMAL value.
                    UIInitPropertyFromDecimal(UI_PKEY_DecimalValue, m_dVal, &m_varNewVal);

                    // Set the UI_PKEY_DecimalValue to the new DECIMAL value.
                    hr = g_pFramework->SetUICommandProperty(nCmdID, UI_PKEY_DecimalValue, m_varNewVal);
                    if (FAILED(hr))
                    {
                        return hr;
                    }
                }
                // Decrease size of shape in document space.
                param.iShapeSizeIncrement = -ppropvarValue->intVal;
            }
            // Spinner value is positive.
            else
            {
                // Increase size of shape in document space.
                param.iShapeSizeIncrement = ppropvarValue->intVal;
            }
        }
        g_renderer.UpdateRenderParam(param);
    }

    return hr;
}

Related topics

Windows Ribbon Framework Control Library

Spinner markup element