From 68997f260fda7994ae0f9772fdb66489e18e305c Mon Sep 17 00:00:00 2001
From: Noisyfox <timemanager.rick@gmail.com>
Date: Wed, 22 Jan 2025 10:03:53 +0800
Subject: [PATCH] Fix auto-hide taskbar overlapping issue when maximized
 (#8118)

Fix auto-hide taskbar overlapping issue when maximized (SoftFever/OrcaSlicer#8085)
---
 src/slic3r/GUI/MainFrame.cpp | 65 +++++++++++++++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 123939efb0..945e8b493e 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -66,6 +66,7 @@
 #ifdef _WIN32
 #include <dbt.h>
 #include <shlobj.h>
+#include <shellapi.h>
 #endif // _WIN32
 #include <slic3r/GUI/CreatePresetsDialog.hpp>
 
@@ -634,8 +635,64 @@ void MainFrame::bind_diff_dialog()
 
 #ifdef __WIN32__
 
+// Orca: Fix maximized window overlaps taskbar when taskbar auto hide is enabled (#8085)
+// Adopted from https://gist.github.com/MortenChristiansen/6463580
+static void AdjustWorkingAreaForAutoHide(const HWND hWnd, MINMAXINFO* mmi)
+{
+    const auto taskbarHwnd = FindWindowA("Shell_TrayWnd", nullptr);
+    if (!taskbarHwnd) {
+        return;
+    }
+    const auto monitorContainingApplication = MonitorFromWindow(hWnd, MONITOR_DEFAULTTONULL);
+    const auto monitorWithTaskbarOnIt = MonitorFromWindow(taskbarHwnd, MONITOR_DEFAULTTONULL);
+    if (monitorContainingApplication != monitorWithTaskbarOnIt) {
+        return;
+    }
+    APPBARDATA abd;
+    abd.cbSize = sizeof(APPBARDATA);
+    abd.hWnd   = taskbarHwnd;
+
+    // Find if task bar has auto-hide enabled
+    const auto uState = (UINT) SHAppBarMessage(ABM_GETSTATE, &abd);
+    if ((uState & ABS_AUTOHIDE) != ABS_AUTOHIDE) {
+        return;
+    }
+
+    RECT borderThickness;
+    SetRectEmpty(&borderThickness);
+    AdjustWindowRectEx(&borderThickness, GetWindowLongPtr(hWnd, GWL_STYLE) & ~WS_CAPTION, FALSE, 0);
+
+    // Determine taskbar position
+    SHAppBarMessage(ABM_GETTASKBARPOS, &abd);
+    const auto& rc = abd.rc;
+    if (rc.top == rc.left && rc.bottom > rc.right) {
+        // Left
+        const auto offset = borderThickness.left + 2;
+        mmi->ptMaxPosition.x += offset;
+        mmi->ptMaxTrackSize.x -= offset;
+        mmi->ptMaxSize.x -= offset;
+    } else if (rc.top == rc.left && rc.bottom < rc.right) {
+        // Top
+        const auto offset = borderThickness.top + 2;
+        mmi->ptMaxPosition.y += offset;
+        mmi->ptMaxTrackSize.y -= offset;
+        mmi->ptMaxSize.y -= offset;
+    } else if (rc.top > rc.left) {
+        // Bottom
+        const auto offset = borderThickness.bottom + 2;
+        mmi->ptMaxSize.y -= offset;
+        mmi->ptMaxTrackSize.y -= offset;
+    } else {
+        // Right
+        const auto offset = borderThickness.right + 2;
+        mmi->ptMaxSize.x -= offset;
+        mmi->ptMaxTrackSize.x -= offset;
+    }
+}
+
 WXLRESULT MainFrame::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 {
+    HWND hWnd = GetHandle();
     /* When we have a custom titlebar in the window, we don't need the non-client area of a normal window
      * to be painted. In order to achieve this, we handle the "WM_NCCALCSIZE" which is responsible for the
      * size of non-client area of a window and set the return value to 0. Also we have to tell the
@@ -654,7 +711,6 @@ WXLRESULT MainFrame::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam
     its wParam value is TRUE and the return value is 0 */
     case WM_NCCALCSIZE:
         if (wParam) {
-            HWND hWnd = GetHandle();
             /* Detect whether window is maximized or not. We don't need to change the resize border when win is
              *  maximized because all resize borders are gone automatically */
             WINDOWPLACEMENT wPos;
@@ -677,6 +733,13 @@ WXLRESULT MainFrame::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam
             }
         }
         break;
+
+    case WM_GETMINMAXINFO: {
+        auto mmi = (MINMAXINFO*) lParam;
+        HandleGetMinMaxInfo(mmi);
+        AdjustWorkingAreaForAutoHide(hWnd, mmi);
+        return 0;
+    }
     }
     return wxFrame::MSWWindowProc(nMsg, wParam, lParam);
 }