From c2fea6bd96de92b0196b1a655e95b9f7d7d8d634 Mon Sep 17 00:00:00 2001
From: Brendan Hagan <bhaganksu@gmail.com>
Date: Mon, 13 Jun 2022 23:40:26 -0400
Subject: [PATCH] ui: default image slice selection to center

---
 src/gui/image_slice_window.cpp | 12 ++++++++++++
 src/gui/image_slice_window.hpp |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/src/gui/image_slice_window.cpp b/src/gui/image_slice_window.cpp
index 33def1d1..a3ab465b 100644
--- a/src/gui/image_slice_window.cpp
+++ b/src/gui/image_slice_window.cpp
@@ -51,6 +51,16 @@ void ImageSlice::constrain(PreferedProperty prefer) {
   }
 }
 
+void ImageSlice::centerSelection() {
+    if (selection.GetWidth() < source.GetWidth()) {
+        selection.x = ((source.GetWidth() - selection.GetWidth()) / 2);
+    }
+
+    if (selection.GetHeight() < source.GetHeight()) {
+        selection.y = ((source.GetHeight() - selection.GetHeight()) / 2);
+    }
+}
+
 Image ImageSlice::getSlice() const {
   if (selection.width == target_size.GetWidth() && selection.height == target_size.GetHeight() && selection.x == 0 && selection.y == 0) {
     // exactly the right size
@@ -82,6 +92,8 @@ ImageSliceWindow::ImageSliceWindow(Window* parent, const Image& source, const wx
 {
   // init slice
   slice.constrain();
+  slice.centerSelection();
+
   // init controls
   const wxPoint defPos = wxDefaultPosition;
   const wxSize spinSize(80,-1);
diff --git a/src/gui/image_slice_window.hpp b/src/gui/image_slice_window.hpp
index 12c278c2..59af5eda 100644
--- a/src/gui/image_slice_window.hpp
+++ b/src/gui/image_slice_window.hpp
@@ -42,6 +42,8 @@ public:
   
   /// Enforce relations between values
   void constrain(PreferedProperty prefer = PREFER_NONE);
+  /// Attempt to center the current constraints
+  void centerSelection();
   /// Get the sliced image
   Image getSlice() const;