From 1a95169466614af21707f4928097af2d49f86403 Mon Sep 17 00:00:00 2001
From: enricoturri1966 <enricoturri@seznam.cz>
Date: Wed, 29 Sep 2021 11:56:55 +0200
Subject: [PATCH] Tech ENABLE_PREVIEW_LAYOUT - Fixed legend width when moving
 the application to another monitor

---
 src/slic3r/GUI/GCodeViewer.cpp | 14 ++++++++++++--
 src/slic3r/GUI/GCodeViewer.hpp | 17 +++++++++++++++++
 src/slic3r/GUI/GLCanvas3D.cpp  |  3 +++
 3 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index b65d401f7..0ab4f80d6 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -758,6 +758,9 @@ void GCodeViewer::reset()
 #if ENABLE_GCODE_VIEWER_STATISTICS
     m_statistics.reset_all();
 #endif // ENABLE_GCODE_VIEWER_STATISTICS
+#if ENABLE_PREVIEW_LAYOUT
+    m_legend_resizer.reset();
+#endif // ENABLE_PREVIEW_LAYOUT
 }
 
 void GCodeViewer::render()
@@ -3513,8 +3516,11 @@ void GCodeViewer::render_legend(float& legend_height)
     bool view_type_changed = false;
     int old_view_type = static_cast<int>(get_view_type());
     int view_type = old_view_type;
-    ImGuiStyle& style = ImGui::GetStyle();
-    ImGui::PushItemWidth(ImGui::GetWindowWidth() - style.ItemSpacing.x - 2.0f * style.FramePadding.x);
+
+    ImGui::SetNextItemWidth(m_legend_resizer.dirty ? 0.0f : -1.0f);
+    if (m_legend_resizer.last_width > ImGui::GetWindowWidth())
+        m_legend_resizer.dirty = false;
+
     ImGui::PushStyleColor(ImGuiCol_FrameBg, { 0.1f, 0.1f, 0.1f, 0.8f });
     ImGui::PushStyleColor(ImGuiCol_FrameBgHovered, { 0.2f, 0.2f, 0.2f, 0.8f });
     imgui.combo("", { _u8L("Feature type"),
@@ -4182,6 +4188,10 @@ void GCodeViewer::render_legend(float& legend_height)
         const float mid_x = 0.5f * (pos.x + pos.x + size);
         window.DrawList->AddRectFilled({ mid_x - 0.09375f * size, p1.y - 0.25f * size }, { mid_x + 0.09375f * size, pos.y + margin }, color);
         });
+
+    m_legend_resizer.last_width = ImGui::GetCurrentWindow()->DC.CursorPosPrevLine.x + ImGui::GetStyle().WindowPadding.x;
+    if (m_legend_resizer.last_width < ImGui::GetWindowWidth())
+        m_legend_resizer.dirty = true;
 #endif // ENABLE_PREVIEW_LAYOUT
 
     legend_height = ImGui::GetCurrentWindow()->Size.y;
diff --git a/src/slic3r/GUI/GCodeViewer.hpp b/src/slic3r/GUI/GCodeViewer.hpp
index 15b8d453c..b002826d1 100644
--- a/src/slic3r/GUI/GCodeViewer.hpp
+++ b/src/slic3r/GUI/GCodeViewer.hpp
@@ -793,6 +793,19 @@ private:
     Shells m_shells;
     EViewType m_view_type{ EViewType::FeatureType };
     bool m_legend_enabled{ true };
+#if ENABLE_PREVIEW_LAYOUT
+    struct LegendResizer
+    {
+        bool dirty{ true };
+        float last_width{ 0.0f };
+
+        void reset() {
+            dirty = true;
+            last_width = 0.0f;
+        }
+    };
+    LegendResizer m_legend_resizer;
+#endif // ENABLE_PREVIEW_LAYOUT
     PrintEstimatedStatistics m_print_statistics;
     PrintEstimatedStatistics::ETimeMode m_time_estimate_mode{ PrintEstimatedStatistics::ETimeMode::Normal };
 #if ENABLE_GCODE_VIEWER_STATISTICS
@@ -858,6 +871,10 @@ public:
     std::vector<CustomGCode::Item>& get_custom_gcode_per_print_z() { return m_custom_gcode_per_print_z; }
     size_t get_extruders_count() { return m_extruders_count; }
 
+#if ENABLE_PREVIEW_LAYOUT
+    void invalidate_legend() { m_legend_resizer.reset(); }
+#endif // ENABLE_PREVIEW_LAYOUT
+
 private:
     void load_toolpaths(const GCodeProcessor::Result& gcode_result);
     void load_shells(const Print& print, bool initialized);
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 5ebf57c6c..57d338600 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -3741,6 +3741,9 @@ void GLCanvas3D::set_cursor(ECursorType type)
 
 void GLCanvas3D::msw_rescale()
 {
+#if ENABLE_PREVIEW_LAYOUT
+    m_gcode_viewer.invalidate_legend();
+#endif // ENABLE_PREVIEW_LAYOUT
 }
 
 void GLCanvas3D::update_tooltip_for_settings_item_in_main_toolbar()