void Viewport::MouseDown(const Helium::MouseButtonInput& input)
{
// reset drag mode
m_DragMode = DragModes::None;
// are we going to allow entering select drag?
bool allowSelection = true;
// if the camera modifier key is down
if (input.AltIsDown())
{
m_Cameras[m_CameraMode].MouseDown( input );
// camera now owns the drag
m_DragMode = DragModes::Camera;
// do NOT allow selection while moving the camera
allowSelection = false;
// Save the previous view before it is updated
UpdateCameraHistory();
}
else if (m_Tool) // else if we have a tool object
{
// hit test the tool, and if we intersect or its a tool modifier mouse key
if (m_Tool->MouseDown( input ) || input.MiddleDown() || input.RightDown())
{
// the tool now owns this drag
m_DragMode = DragModes::Tool;
}
else
{
// we can still allow selection if it didn't hit he tool
allowSelection = m_Tool->AllowSelection();
}
}
// if its the left key if we are still looking for a selection
if ( (input.LeftIsDown() || input.MiddleIsDown()) && m_DragMode == DragModes::None && allowSelection )
{
// we are selecting
m_DragMode = DragModes::Select;
// reset point trackers
m_Start = Point (input.GetPosition().x, input.GetPosition().y);
m_End = Point (input.GetPosition().x, input.GetPosition().y);
// reset selection frame
m_SelectionFrame->m_Start = m_Start;
m_SelectionFrame->m_End = m_End;
m_SelectionFrame->Update();
// if we are highlighting
if ( m_Highlighting )
{
// clear the previously highlighted set
m_ClearHighlight.Raise( ClearHighlightArgs (false) );
}
}
}
