From 51414203b96e1c52785709c1456692c74eb689d3 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Fri, 5 May 2023 02:56:52 -0500
Subject: [PATCH] GUI: allow pulling selection in sample editor

---
 src/gui/gui.cpp        |  1 +
 src/gui/gui.h          |  3 +++
 src/gui/sampleEdit.cpp | 45 +++++++++++++++++++++++++++++++++++++++---
 3 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 0f255513e..e3f4b3d54 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -6735,6 +6735,7 @@ FurnaceGUI::FurnaceGUI():
   sampleDragMode(false),
   sampleDrag16(false),
   sampleZoomAuto(true),
+  sampleSelTarget(0),
   sampleDragTarget(NULL),
   sampleDragStart(0,0),
   sampleDragAreaSize(0,0),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 833a8c1cc..92dec1e41 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1813,6 +1813,9 @@ class FurnaceGUI {
   int sampleSelStart, sampleSelEnd;
   bool sampleInfo, sampleCompatRate;
   bool sampleDragActive, sampleDragMode, sampleDrag16, sampleZoomAuto;
+  // 0: start
+  // 1: end
+  unsigned char sampleSelTarget;
   void* sampleDragTarget;
   ImVec2 sampleDragStart;
   ImVec2 sampleDragAreaSize;
diff --git a/src/gui/sampleEdit.cpp b/src/gui/sampleEdit.cpp
index cb138454c..ce56ae96e 100644
--- a/src/gui/sampleEdit.cpp
+++ b/src/gui/sampleEdit.cpp
@@ -1224,6 +1224,31 @@ void FurnaceGUI::drawSampleEdit() {
         ImVec2 rectMax=ImGui::GetItemRectMax();
         ImVec2 rectSize=ImGui::GetItemRectSize();
 
+        unsigned char selectTarget=255;
+
+        if (ImGui::IsItemHovered()) {
+          int start=sampleSelStart;
+          int end=sampleSelEnd;
+          if (start>end) {
+            start^=end;
+            end^=start;
+            start^=end;
+          }
+          ImVec2 p1=rectMin;
+          p1.x+=(start-samplePos)/sampleZoom;
+
+          ImVec2 p2=ImVec2(rectMin.x+(end-samplePos)/sampleZoom,rectMax.y);
+
+          ImVec2 mousePos=ImGui::GetMousePos();
+          if (p1.x>=rectMin.x && p1.x<=rectMax.x && fabs(mousePos.x-p1.x)<2.0*dpiScale) {
+            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeEW);
+            selectTarget=0;
+          } else if (p2.x>=rectMin.x && p2.x<=rectMax.x && fabs(mousePos.x-p2.x)<2.0*dpiScale) {
+            ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeEW);
+            selectTarget=1;
+          }
+        }
+
         if (ImGui::IsItemClicked()) {
           nextWindow=GUI_WINDOW_SAMPLE_EDIT;
           if (ImGui::IsMouseDoubleClicked(ImGuiMouseButton_Left)) {
@@ -1250,9 +1275,23 @@ void FurnaceGUI::drawSampleEdit() {
               }
               sampleDragLen=sample->samples;
               sampleDragActive=true;
-              sampleSelStart=-1;
-              sampleSelEnd=-1;
-              if (sampleDragMode) sample->prepareUndo(true);
+              if (!sampleDragMode) {
+                switch (selectTarget) {
+                  case 0:
+                    sampleSelStart^=sampleSelEnd;
+                    sampleSelEnd^=sampleSelStart;
+                    sampleSelStart^=sampleSelEnd;
+                    break;
+                  case 1:
+                    break;
+                  default:
+                    sampleSelStart=-1;
+                    sampleSelEnd=-1;
+                    break;
+                }
+              } else {
+                sample->prepareUndo(true);
+              }
               processDrags(ImGui::GetMousePos().x,ImGui::GetMousePos().y);
             }
           }