This is a helper for simplified mouse tracking modeled after the XNA C# Mouse class.
For exception safety, it is recommended you make use of the C++ RAII pattern and use a std::unique_ptr.
For universal Windows apps or Windows Store apps, you need to call SetWindow and SetDpi in the appropriate places.
When resuming from a pause or suspend, be sure to call Reset on the tracker object to clear the state history.
Header
#include <Mouse.h>
Initialization
Mouse is a singleton.
std::unique_ptr<Mouse> mouse( new Mouse );Integration
For Windows desktop applications, the application needs to make the appropriate calls during the main WndProc message processing:
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_MOUSEMOVE:
case WM_LBUTTONDOWN:
case WM_LBUTTONUP:
case WM_RBUTTONDOWN:
case WM_RBUTTONUP:
case WM_MBUTTONDOWN:
case WM_MBUTTONUP:
case WM_MOUSEWHEEL:
case WM_XBUTTONDOWN:
case WM_XBUTTONUP:
Mouse::ProcessMessage(message, wParam, lParam);
break;
}
return DefWindowProc(hWnd, message, wParam, lParam);
}For universal Windows apps or Windows Store apps, you need to call SetWindow and SetDpi in the appropriate places.
void App::SetWindow(CoreWindow^ window) { mouse->SetWindow(window); } void App::OnDpiChanged(DisplayInformation^ sender, Object^ args) { mouse->SetDpi(sender->LogicalDpi); }
Basic use
GetState queries the current state of the mouse.auto m = mouse->GetState(); if ( m.leftButton ) // Left button is down XMFLOAT2 mousePosInPixels( float(m.x), float(m.y) ); // This is the absolute position of the mouse relative// to the upper-left corner of the window
Button state tracker
A common pattern is to trigger an action when a mouse button is pressed or released, but you don't want to trigger the action every single frame if the button is held down for more than a single frame. This helper class simplifies this.std::unique_ptr<Mouse::ButtonStateTracker> tracker( new Mouse::ButtonStateTracker ); ... auto state = mouse->GetState(); tracker->Update( state ); if ( tracker->rightButton == GamePad::ButtonStateTracker::PRESSED ) // Take an action when Right mouse button is first pressed, but don't do it again until// the button is released and then pressed again
When resuming from a pause or suspend, be sure to call Reset on the tracker object to clear the state history.