nextextent.cpp

来自「在vc环境下」· C++ 代码 · 共 50 行

#include "StdAfx.h"
#include ".\nextextent.h"

/////////////////////////////////////////////////////////////////////////////
// CNextExtent
STDMETHODIMP CNextExtent::OnClick()
{

	IActiveViewPtr cpActiveView;
	GetFocusMapActiveView(&cpActiveView);
	if (cpActiveView==0) return S_OK;

	IExtentStackPtr cpExtentStack;
	HRESULT hr = cpActiveView->get_ExtentStack(&cpExtentStack);
	if (FAILED(hr)) return hr;

	VARIANT_BOOL bCanRedo;
	hr = cpExtentStack->CanRedo(&bCanRedo);
	if (FAILED(hr)) return hr;

	if (bCanRedo == VARIANT_TRUE)
	{
		hr = cpExtentStack->Redo();
		if (FAILED(hr)) return hr;
	}

	return hr;

}


STDMETHODIMP CNextExtent::get_Enabled(VARIANT_BOOL * Enabled)
{
	// Call base class,enabled - this checks for a focus map
	HRESULT hr = CMapCommandBase::get_Enabled(Enabled);

	if (SUCCEEDED(hr) && (*Enabled))
	{
		IActiveViewPtr cpActiveView;
		GetFocusMapActiveView(&cpActiveView);
		IExtentStackPtr cpExtentStack;
		HRESULT hr = cpActiveView->get_ExtentStack(&cpExtentStack);
		if (FAILED(hr)) return hr;

		hr = cpExtentStack->CanRedo(Enabled);
	}

	return hr;
}