pan.cpp

在vc环境下

#include "StdAfx.h"
#include ".\pan.h"

/////////////////////////////////////////////////////////////////////////////
// CPan

STDMETHODIMP CPan::OnMouseDown(LONG Button, LONG Shift, LONG X, LONG Y)
{
	if (MouseDown(X,Y))
	{
		// Start the feedback
		IScreenDisplayPtr cpScreenDisplay;
		GetFocusMapScreenDisplay(&cpScreenDisplay);

		IPointPtr cpPoint;
		ToFocusMapPoint(X,Y, &cpPoint);
		cpScreenDisplay->PanStart(cpPoint);
	}

	return S_OK;
}

STDMETHODIMP CPan::OnMouseMove(LONG Button, LONG Shift, LONG X, LONG Y)
{

	if (CMapToolBase::IsMouseDown())
	{
		// Move the pan
		IScreenDisplayPtr cpScreenDisplay;
		GetFocusMapScreenDisplay(&cpScreenDisplay);

		IPointPtr cpPoint;
		ToFocusMapPoint(X,Y, &cpPoint);
		cpScreenDisplay->PanMoveTo(cpPoint);
	}

	return S_OK;

}

STDMETHODIMP CPan::OnMouseUp(LONG Button, LONG Shift, LONG X, LONG Y)
{
	if (CMapToolBase::IsMouseDown())
	{
		// Finish the Pan
		IScreenDisplayPtr cpScreenDisplay;
		IActiveViewPtr cpActiveView;
		GetFocusMapActiveView(&cpActiveView);
		cpActiveView->get_ScreenDisplay(&cpScreenDisplay);

		IPointPtr cpPoint;
		ToFocusMapPoint(X,Y, &cpPoint);
		IEnvelopePtr cpNewEnvelope;
		cpScreenDisplay->PanStop(&cpNewEnvelope);

		// Update new maps extent
		cpActiveView->put_Extent(cpNewEnvelope);
		cpActiveView->Refresh();

	}

	// release mouse capture in base class
	CMapToolBase::MouseUp();

	return S_OK;
}


STDMETHODIMP CPan::OnKeyDown(LONG keyCode, LONG Shift)
{
	if (keyCode == VK_ESCAPE)
	{
		// Abort the Pan as escape is pressed
		IScreenDisplayPtr cpScreenDisplay;
		IActiveViewPtr cpActiveView;
		GetFocusMapActiveView(&cpActiveView);
		cpActiveView->get_ScreenDisplay(&cpScreenDisplay);

		IEnvelopePtr cpNewEnvelope;
		cpScreenDisplay->PanStop(&cpNewEnvelope);

		// Cause a repaint of the window to clear the pan effect
		HWND hWnd;
		m_hookHelper.get_hWnd(&hWnd);
		::InvalidateRect(hWnd, 0, FALSE);

		CMapToolBase::MouseUp();
	}

	return S_OK;
}