From 2e15f60ef6f9025916611fc8495f95df4ed04a27 Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Mon, 6 Feb 2017 15:09:09 +0000
Subject: [PATCH] Win32: implement support for full-screen graphics window.

---
 CHANGELOG.md             |  1 +
 src/graphicswin.cpp      |  4 ----
 src/platform/w32main.cpp | 28 +++++++++++++++++++++++++---
 3 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4cfd461e..1b194fdd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -61,6 +61,7 @@ Other new features:
   * In expressions, numbers can contain the digit group separator, "_".
   * The "=" key is bound to "Zoom In", like "+" key.
   * The numpad decimal separator key is bound to "." regardless of locale.
+  * On Windows, full-screen mode is implemented.
 
 Bugs fixed:
   * A point in 3d constrained to any line whose length is free no longer
diff --git a/src/graphicswin.cpp b/src/graphicswin.cpp
index 7f15bd88..076c5d39 100644
--- a/src/graphicswin.cpp
+++ b/src/graphicswin.cpp
@@ -81,10 +81,8 @@ const GraphicsWindow::MenuEntry GraphicsWindow::menu[] = {
 { 1,  NULL,                             Command::NONE,             0,       TN, NULL  },
 { 1, N_("Dimensions in &Inches"),       Command::UNITS_INCHES,     0,       TR, mView },
 { 1, N_("Dimensions in &Millimeters"),  Command::UNITS_MM,         0,       TR, mView },
-#if defined(__unix__) || defined(__APPLE__)
 { 1,  NULL,                             Command::NONE,             0,       TN, NULL  },
 { 1, N_("&Full Screen"),                Command::FULL_SCREEN,      C|F(11), TC, mView },
-#endif
 
 { 0, N_("&New Group"),                  Command::NONE,             0,       TN, NULL  },
 { 1, N_("Sketch In &3d"),               Command::GROUP_3D,         S|'3',   TN, mGrp  },
@@ -685,9 +683,7 @@ void GraphicsWindow::EnsureValidActives() {
     CheckMenuByCmd(Command::SHOW_TOOLBAR, /*checked=*/SS.showToolbar);
     CheckMenuByCmd(Command::PERSPECTIVE_PROJ, /*checked=*/SS.usePerspectiveProj);
     CheckMenuByCmd(Command::SHOW_GRID,/*checked=*/SS.GW.showSnapGrid);
-#if defined(__unix__) || defined(__APPLE__)
     CheckMenuByCmd(Command::FULL_SCREEN, /*checked=*/FullScreenIsActive());
-#endif
 
     if(change) SS.ScheduleShowTW();
 }
diff --git a/src/platform/w32main.cpp b/src/platform/w32main.cpp
index 63080cf3..5960f0e8 100644
--- a/src/platform/w32main.cpp
+++ b/src/platform/w32main.cpp
@@ -850,12 +850,34 @@ void SolveSpace::InvalidateGraphics()
 
 void SolveSpace::ToggleFullScreen()
 {
-    // Implement me
+    static WINDOWPLACEMENT wp;
+    wp.length = sizeof(wp);
+
+    DWORD dwStyle = GetWindowLong(GraphicsWnd, GWL_STYLE);
+    if(dwStyle & WS_OVERLAPPEDWINDOW) {
+        MONITORINFO mi;
+        mi.cbSize = sizeof(mi);
+
+        if(GetWindowPlacement(GraphicsWnd, &wp) &&
+                GetMonitorInfo(MonitorFromWindow(GraphicsWnd, MONITOR_DEFAULTTOPRIMARY), &mi)) {
+            SetWindowLong(GraphicsWnd, GWL_STYLE, dwStyle & ~WS_OVERLAPPEDWINDOW);
+            SetWindowPos(GraphicsWnd, HWND_TOP,
+                         mi.rcMonitor.left, mi.rcMonitor.top,
+                         mi.rcMonitor.right - mi.rcMonitor.left,
+                         mi.rcMonitor.bottom - mi.rcMonitor.top,
+                         SWP_NOOWNERZORDER | SWP_FRAMECHANGED);
+        }
+    } else {
+        SetWindowLong(GraphicsWnd, GWL_STYLE, dwStyle | WS_OVERLAPPEDWINDOW);
+        SetWindowPlacement(GraphicsWnd, &wp);
+        SetWindowPos(GraphicsWnd, NULL, 0, 0, 0, 0,
+                     SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER |
+                     SWP_NOOWNERZORDER | SWP_FRAMECHANGED);
+    }
 }
 bool SolveSpace::FullScreenIsActive()
 {
-    // Implement me
-    return false;
+    return GetWindowLong(GraphicsWnd, GWL_STYLE) & WS_OVERLAPPEDWINDOW;
 }
 
 void SolveSpace::InvalidateText()