The Model-View-Controller Architecture - Essentials of Interactive Computer Graphics - page 124

class CDrawAndMouseHandler : public UWBD3D _ WindowHandler {

Source file.
DrawAndMouseHandler.h in
the WindowHandler folder of
the D3D _ MouseInput project.

Identical to CDrawOnlyHandler from Tutorial 5.1
bool Initialize(CDialog& parent _ dlg, int control _ id);
void DrawGraphics();
UWBMFC _ UIWindow m _ window;
Override from UWB_WindowHandler to implement Listing 5.13
void OnMouseButton( bool down, unsigned int nFlags, int hwX, int hwY);
void OnMouseMove( unsigned int nFlags, int hwX, int hwY);
// down - TRUE (mouse button when down) or FALSE (mouse button went up)
// nFlags - Which buttons (e.g. left, right, center, etc.)
// hwX / hwY - Mouse Position (in hardware coordinate where upper-left is origin)

};

Listing 5.14. CDrawAndMouseHandler class (Tutorial 5.2).

void CDrawAndMouseHandler::OnMouseButton( bool down, unsigned int nFlags, int hwX, int hwY)
Transforms origin from the upper left to the lower left corner
HardwareToDevice(hwX, hwY, deviceX, deviceY); // hardware to device coordinate
Left Mouse Button Down: this is condition A: of Listing 5.13.
if (nFlags & MK _ LBUTTON)
if (down) theApp.GetModel().CreateCircleAt(deviceX, deviceY);
.
Right Mouse Button Down: this is condition C: of Listing 5.13.

Source file.
DrawAndMouseHandler.cpp
in the WindowHandler folder
of

if (nFlags & MK _ RBUTTON)
if (down) theApp.GetModel().MoveCirceTo(deviceX, deviceY);
.
void CDrawAndMouseHandler::OnMouseMove( unsigned int nFlags, int hwX, int hwY)
HardwareToDevice(hwX, hwY, deviceX, deviceY); // hardware to device coordinate
.
Left Mouse Button Down: this is condition B: of Listing 5.13.
if (nFlags & MK _ LBUTTON)
theApp.GetModel().ResizeCircle(deviceX, deviceY);
.
Left Mouse Button Down: this is condition D: of Listing 5.13.
if (nFlags & MK _ RBUTTON)
theApp.GetModel().MoveCirceTo(deviceX, deviceY);

D3D _ MouseInput the

project.

Listing 5.15. CDrawAndMouseHandler mouse event services (Tutorial 5.2).