From dd8a4a0583a8bea515d14f148c18e685c1d4e41a Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik.hautakoski@gmail.com>
Date: Fri, 16 Oct 2020 19:35:32 +0200
Subject: [PATCH] Platform/Unix/X11Mouse: adding a basic implementation to get
 things going.

---
 source/Platform/Unix/X11Mouse.cpp | 76 ++++++++++++++++++++++++++++++-
 source/Platform/Unix/X11Mouse.h   | 12 +++++
 2 files changed, 87 insertions(+), 1 deletion(-)

diff --git a/source/Platform/Unix/X11Mouse.cpp b/source/Platform/Unix/X11Mouse.cpp
index 48ef3bc..35bf945 100644
--- a/source/Platform/Unix/X11Mouse.cpp
+++ b/source/Platform/Unix/X11Mouse.cpp
@@ -1,15 +1,33 @@
 
+#include <Spectre/System/Event.h>
+#include <Spectre/System/Log.h>
 #include "X11Mouse.h"
 
+#include "X11SharedDisplay.h"
+
 namespace sp {
 
+X11Mouse::X11Mouse() :
+m_disp(NULL),
+m_btn_state(0)
+{
+}
+
+X11Mouse::~X11Mouse()
+{
+	if (m_disp) {
+		XReleaseDisplay();
+	}
+}
+
 void X11Mouse::init()
 {
-
+	m_disp = XGetDisplay();
 }
 
 Vector2f X11Mouse::getPosition() const
 {
+	// TODO: Translate to window.
 	return m_position;
 }
 
@@ -20,12 +38,68 @@ Vector2f X11Mouse::getAbsPosition() const
 
 bool X11Mouse::isButtonDown(Mouse::Button button) const
 {
+	// TODO: Button1 and 2 is defined in x11 and
+	// therefore clashes with Mouse::Button::Button1 and 2.
+	switch(button) {
+	case Mouse::Button::Left :
+		return m_btn_state & Button1Mask;
+	case Mouse::Button::Right :
+		return m_btn_state & Button3Mask;
+    case Mouse::Button::Middle :
+		return m_btn_state & Button2Mask;
+	default :
+		return false;
+	}
 	return false;
 }
 
 void X11Mouse::update(InputModule *input)
 {
+	::Window root, child;
+	int rx, ry, x = 0, y = 0;
 
+	// Query position and button state.
+	XQueryPointer(m_disp, ::XDefaultRootWindow(m_disp),
+		&root, &child,
+		&rx, &ry,
+		&x, &y, &m_btn_state);
+
+	// Update position
+	m_position.x = x;
+	m_position.y = y;
+}
+
+bool X11Mouse::handleMessage(XEvent* xevent, Event& event)
+{
+	if (xevent->type == MotionNotify) {
+		event.type = Event::MouseMove;
+		event.mouseMove.x = xevent->xmotion.x;
+		event.mouseMove.y = xevent->xmotion.y;
+		return true;
+	}
+
+	if (xevent->type == ButtonPress || xevent->type == ButtonRelease) {
+
+		Mouse::Button trans = Mouse::Button::Unknown;
+
+		switch(xevent->xbutton.button) {
+		case Button1 : trans = Mouse::Button::Left; break;
+		case Button2 : trans = Mouse::Button::Middle; break;
+		case Button3 : trans = Mouse::Button::Right; break;
+		// TODO: name clash, need to rename Mouse::Button enums.
+		// case Button4 : trans = Mouse::Button::Button1; break; // clashes with X11's "Button1" define.
+		// case Button5 : trans = Mouse::Button::Button2; break; // clashes with X11's "Button2" define.
+		}
+
+		if (trans != Mouse::Button::Unknown) {
+			event.type = Event::MouseButton;
+			event.mouseButton.pressed = xevent->type == ButtonPress;
+			event.mouseButton.button = trans;
+			return true;
+		}
+	}
+
+	return false;
 }
 
 } // namespace sp
diff --git a/source/Platform/Unix/X11Mouse.h b/source/Platform/Unix/X11Mouse.h
index 55c044e..84c326c 100644
--- a/source/Platform/Unix/X11Mouse.h
+++ b/source/Platform/Unix/X11Mouse.h
@@ -3,12 +3,16 @@
 #define PLATFORM_UNIX_X11MOUSE_H
 
 #include <Spectre/Input/Mouse.h>
+#include <X11/Xlib.h>
 
 namespace sp {
 
 class X11Mouse : public Mouse
 {
 public :
+	X11Mouse();
+	~X11Mouse();
+
 	virtual void init();
 
 	// Get mouse position
@@ -18,12 +22,20 @@ public :
 
 	virtual bool isButtonDown(Mouse::Button button) const;
 
+	// Translate a XEvent to sp::Event, Called from X11EventQueue
+	static bool handleMessage(XEvent* xevent, Event& event);
+
 protected :
 
 	virtual void update(InputModule *input);
 
 protected :
+	::Display* m_disp;
+	::Window m_win;
+
 	Vector2f m_position;
+
+	unsigned int m_btn_state;
 };
 
 } // namespace sp