From f6ca714e2258f4cad433801c88264947d4c2d14c Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 20 Dec 2015 15:43:35 +0200
Subject: [PATCH] Track window positions

---
 source/graphics/window.cpp            |  2 ++
 source/graphics/window.h              |  3 ++
 source/graphics/windows/window.cpp    |  5 ++++
 source/graphics/x11/window.cpp        | 43 +++++++++++++++++++++++++++
 source/graphics/x11/window_platform.h |  3 ++
 5 files changed, 56 insertions(+)

diff --git a/source/graphics/window.cpp b/source/graphics/window.cpp
index d2fb37f..5bc9a35 100644
--- a/source/graphics/window.cpp
+++ b/source/graphics/window.cpp
@@ -9,6 +9,8 @@ namespace Msp {
 namespace Graphics {
 
 WindowOptions::WindowOptions():
+	x(0),
+	y(0),
 	width(640),
 	height(480),
 	fullscreen(false),
diff --git a/source/graphics/window.h b/source/graphics/window.h
index b2c7833..8065762 100644
--- a/source/graphics/window.h
+++ b/source/graphics/window.h
@@ -11,6 +11,8 @@ class Display;
 
 struct WindowOptions
 {
+	int x;
+	int y;
 	unsigned width;
 	unsigned height;
 	bool fullscreen;
@@ -30,6 +32,7 @@ public:
 	objects instead. */
 	sigc::signal<void, const Event &> signal_input_event;
 
+	sigc::signal<void, int, int> signal_move;
 	sigc::signal<void, unsigned, unsigned> signal_resize;
 	sigc::signal<void, unsigned, unsigned, unsigned, unsigned, const Event &> signal_expose;
 	sigc::signal<void> signal_close;
diff --git a/source/graphics/windows/window.cpp b/source/graphics/windows/window.cpp
index 68baea7..b148915 100644
--- a/source/graphics/windows/window.cpp
+++ b/source/graphics/windows/window.cpp
@@ -180,6 +180,11 @@ bool Window::event(const Event &evnt)
 		resizing = false;
 		signal_resize.emit(options.width, options.height);
 		break;
+	case WM_MOVE:
+		options.x = static_cast<short>(LOWORD(evnt.lparam));
+		options.y = static_cast<short>(HIWORD(evnt.lparam));
+		signal_move.emit(options.x, options.y);
+		break;
 	case WM_CLOSE:
 		signal_close.emit();
 		break;
diff --git a/source/graphics/x11/window.cpp b/source/graphics/x11/window.cpp
index 2c03bf7..9b46e4e 100644
--- a/source/graphics/x11/window.cpp
+++ b/source/graphics/x11/window.cpp
@@ -26,6 +26,9 @@ void Window::platform_init()
 
 	priv->wm_delete_window = XInternAtom(dpy, "WM_DELETE_WINDOW", true);
 	priv->invisible_cursor = 0;
+	priv->reparented = false;
+	priv->rel_x = 0;
+	priv->rel_y = 0;
 
 	XSetWindowAttributes attr;
 	attr.override_redirect = options.fullscreen;
@@ -185,6 +188,46 @@ bool Window::event(const Event &evnt)
 			resizing = false;
 			signal_resize.emit(options.width, options.height);
 		}
+
+		{
+			int x = ev.xconfigure.x;
+			int y = ev.xconfigure.y;
+
+			if(priv->reparented)
+			{
+				if(!ev.xconfigure.send_event)
+				{
+					/* If the window manager reparented us, the coordinates of a
+					real event are in the parent window's space. */
+					priv->rel_x = ev.xconfigure.x;
+					priv->rel_y = ev.xconfigure.y;
+
+					const Display::Private &dpy_priv = display.get_private();
+					WindowHandle dummy;
+					XTranslateCoordinates(dpy_priv.display, priv->window, dpy_priv.root_window, 0, 0, &x, &y, &dummy);
+				}
+
+				// Use the coordinates of the window manager frame
+				x -= priv->rel_x;
+				y -= priv->rel_y;
+			}
+
+			if(x!=options.x || y!=options.y)
+			{
+				options.x = x;
+				options.y = y;
+				signal_move.emit(options.x, options.y);
+			}
+		}
+
+		break;
+	case ReparentNotify:
+		priv->reparented = (ev.xreparent.parent!=display.get_private().root_window);
+		if(!priv->reparented)
+		{
+			priv->rel_x = 0;
+			priv->rel_y = 0;
+		}
 		break;
 	case ClientMessage:
 		if(ev.xclient.data.l[0]==static_cast<long>(priv->wm_delete_window))
diff --git a/source/graphics/x11/window_platform.h b/source/graphics/x11/window_platform.h
index 3c81a6e..41cdec8 100644
--- a/source/graphics/x11/window_platform.h
+++ b/source/graphics/x11/window_platform.h
@@ -12,6 +12,9 @@ struct PlatformWindowPrivate
 {
 	Atom wm_delete_window;
 	Cursor invisible_cursor;
+	bool reparented;
+	int rel_x;
+	int rel_y;
 };
 
 struct PlatformEvent
-- 
2.43.0