From 92c4f33f3757ad8682f4ac9fb042fd974181f8c2 Mon Sep 17 00:00:00 2001
From: Kieran Millar <kieranmccleanmillar@gmail.com>
Date: Mon, 20 Nov 2017 21:42:46 +0000
Subject: [PATCH] Shift scroll bar by clicking and holding in empty scroll bar
 area

---
 src/Editor/editor.cpp |  1 +
 src/Editor/editor.hpp |  2 ++
 src/Editor/input.cpp  | 42 ++++++++++++++++++++++++++++++------------
 src/Editor/input.hpp  |  3 ++-
 4 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/src/Editor/editor.cpp b/src/Editor/editor.cpp
index f3af33b..1fddb04 100644
--- a/src/Editor/editor.cpp
+++ b/src/Editor/editor.cpp
@@ -50,6 +50,7 @@ bool Editor::load( int n, Window * w )
 	bar.load();
 	canvas.load();
 	editor_input.load();
+	gameFrameCount = 0;
 	
 	return canvas.redraw = true;
 }
diff --git a/src/Editor/editor.hpp b/src/Editor/editor.hpp
index 91d0533..db4f49b 100644
--- a/src/Editor/editor.hpp
+++ b/src/Editor/editor.hpp
@@ -53,6 +53,8 @@ class Editor
 	
 	typedef std::vector< std::pair<Level::Object::Index, Level::Object> > Clipboard;
 	Clipboard clipboard;
+
+	Uint32 gameFrameCount;
 	
 	void resize(int w, int h);
 
diff --git a/src/Editor/input.cpp b/src/Editor/input.cpp
index fb94967..64b2b14 100644
--- a/src/Editor/input.cpp
+++ b/src/Editor/input.cpp
@@ -50,6 +50,7 @@ void Editor_input::load(void)
 	rightScrollButtonHolding = false;
 	scrollBarHolding = false;
 	scrollBarHoldingOffset = 0;
+	scrollBarShifting = false;
 	holdingID = -1;
 	holdingType = -1;
 }
@@ -167,7 +168,7 @@ void Editor_input::handleEvents(SDL_Event event)
 			else
 				// piece browser scroll bar area
 			{
-
+				scrollBarShifting = true;
 			}
 		}
 		break;
@@ -183,6 +184,7 @@ void Editor_input::handleEvents(SDL_Event event)
 			leftScrollButtonHolding = false;
 			rightScrollButtonHolding = false;
 			scrollBarHolding = false;
+			scrollBarShifting = false;
 		}
 		break;
 	}
@@ -304,18 +306,32 @@ void Editor_input::handleEvents(SDL_Event event)
 
 			if (mouse_state & SDL_BUTTON(SDL_BUTTON_LEFT))
 			{
-				if (leftScrollButtonHolding
-					&& mouse_x_window > BAR_HEIGHT
-					&& mouse_x_window < BAR_HEIGHT + 16
-					&& mouse_y_window > window_ptr->height - 16)
-				{
-					bar_ptr->scroll(-50);
-				}
-				if (rightScrollButtonHolding
-					&& mouse_x_window > window_ptr->width - 16
-					&& mouse_y_window > window_ptr->height - 16)
+				if (mouse_y_window > window_ptr->height - 16) // scroll bar area
 				{
-					bar_ptr->scroll(50);
+					if (leftScrollButtonHolding
+						&& mouse_x_window > BAR_HEIGHT
+						&& mouse_x_window < BAR_HEIGHT + 16)
+					{
+						bar_ptr->scroll(-50);
+					}
+					if (rightScrollButtonHolding
+						&& mouse_x_window > window_ptr->width - 16)
+					{
+						bar_ptr->scroll(50);
+					}
+					if (scrollBarShifting
+						&& mouse_x_window < window_ptr->width - 16
+						&& mouse_x_window > BAR_HEIGHT + 16)
+					{
+						if (bar_ptr->barScrollRect.x > mouse_x_window)
+						{
+							bar_ptr->moveScrollBar(bar_ptr->barScrollRect.x - (bar_ptr->barScrollRect.w / 2));
+						}
+						else if (bar_ptr->barScrollRect.x + bar_ptr->barScrollRect.w < mouse_x_window)
+						{
+							bar_ptr->moveScrollBar(bar_ptr->barScrollRect.x + (bar_ptr->barScrollRect.w / 2));
+						}
+					}
 				}
 			}		
 		}
@@ -326,6 +342,8 @@ void Editor_input::handleEvents(SDL_Event event)
 
 		SDL_RenderPresent(window_ptr->screen_renderer);
 
+		editor_ptr->gameFrameCount++;
+
 		break;
 	}
 	default:
diff --git a/src/Editor/input.hpp b/src/Editor/input.hpp
index f4e265e..487c7f9 100644
--- a/src/Editor/input.hpp
+++ b/src/Editor/input.hpp
@@ -44,7 +44,8 @@ class Editor_input
 	bool redraw;
 
 	Sint32 mouse_prev_x, mouse_prev_y;
-	bool dragging, leftScrollButtonHolding, rightScrollButtonHolding, scrollBarHolding;
+	bool dragging, leftScrollButtonHolding, rightScrollButtonHolding;
+	bool scrollBarHolding, scrollBarShifting;
 	int scrollBarHoldingOffset;
 
 	int holdingID, holdingType;