Merge branch 'master' into navigation

# Conflicts:
#	imgui.cpp
#	imgui.h

README.md

@@ -77,6 +77,7 @@ Frameworks:
 - Cinder: https://github.com/simongeilfus/Cinder-ImGui
 - cocos2d-x: https://github.com/c0i/imguix https://github.com/ocornut/imgui/issues/551
 - Flexium/SFML (FlexGUI): https://github.com/DXsmiley/FlexGUI
+- GML/GameMakerStudio2 (ImGuiGML): https://marketplace.yoyogames.com/assets/6221/imguigml
 - Irrlicht (IrrIMGUI): https://github.com/ZahlGraf/IrrIMGUI
 - Ogre: https://bitbucket.org/LMCrashy/ogreimgui/src
 - openFrameworks (ofxImGui): https://github.com/jvcleave/ofxImGui

imgui.cpp

@@ -4970,12 +4970,8 @@ static ImGuiWindow* CreateNewWindow(const char* name, ImVec2 size, ImGuiWindowFl
     window->Flags = flags;
     g.WindowsById.SetVoidPtr(window->ID, window);
 
-    if (flags & ImGuiWindowFlags_NoSavedSettings)
+    // User can disable loading and saving of settings. Tooltip and child windows also don't store settings.
-    {
+    if (!(flags & ImGuiWindowFlags_NoSavedSettings))
-        // User can disable loading and saving of settings. Tooltip and child windows also don't store settings.
-        window->Size = window->SizeFull = size;
-    }
-    else
     {
         // Retrieve settings from .ini file
         // Use SetWindowPos() or SetNextWindowPos() with the appropriate condition flag to change the initial position of a window.
@@ -4991,8 +4987,8 @@ static ImGuiWindow* CreateNewWindow(const char* name, ImVec2 size, ImGuiWindowFl
             if (ImLengthSqr(settings->Size) > 0.00001f)
                 size = settings->Size;
         }
-        window->Size = window->SizeFull = size;
     }
+    window->Size = window->SizeFull = window->SizeFullAtLastBegin = size;
 
     if ((flags & ImGuiWindowFlags_AlwaysAutoResize) != 0)
     {
@@ -5183,6 +5179,20 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
     else
         flags = window->Flags;
 
+    // Update the Appearing flag
+    bool window_just_activated_by_user = (window->LastFrameActive < current_frame - 1);   // Not using !WasActive because the implicit "Debug" window would always toggle off->on
+    const bool window_just_appearing_after_hidden_for_resize = (window->HiddenFrames == 1);
+    if (flags & ImGuiWindowFlags_Popup)
+    {
+        ImGuiPopupRef& popup_ref = g.OpenPopupStack[g.CurrentPopupStack.Size];
+        window_just_activated_by_user |= (window->PopupId != popup_ref.PopupId); // We recycle popups so treat window as activated if popup id changed
+        window_just_activated_by_user |= (window != popup_ref.Window);
+    }
+    window->Appearing = (window_just_activated_by_user || window_just_appearing_after_hidden_for_resize);
+    window->CloseButton = (p_open != NULL);
+    if (window->Appearing)
+        SetWindowConditionAllowFlags(window, ImGuiCond_Appearing, true);
+
     // Parent window is latched only on the first call to Begin() of the frame, so further append-calls can be done from a different window stack
     ImGuiWindow* parent_window = first_begin_of_the_frame ? (!g.CurrentWindowStack.empty() ? g.CurrentWindowStack.back() : NULL) : window->ParentWindow;
     IM_ASSERT(parent_window != NULL || !(flags & ImGuiWindowFlags_ChildWindow));
@@ -5191,27 +5201,18 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
     g.CurrentWindowStack.push_back(window);
     SetCurrentWindow(window);
     CheckStacksSize(window, true);
-
-    bool window_just_activated_by_user = (window->LastFrameActive < current_frame - 1);   // Not using !WasActive because the implicit "Debug" window would always toggle off->on
     if (flags & ImGuiWindowFlags_Popup)
     {
         ImGuiPopupRef& popup_ref = g.OpenPopupStack[g.CurrentPopupStack.Size];
-        window_just_activated_by_user |= (window->PopupId != popup_ref.PopupId); // We recycle popups so treat window as activated if popup id changed
-        window_just_activated_by_user |= (window != popup_ref.Window);
         popup_ref.Window = window;
         g.CurrentPopupStack.push_back(popup_ref);
         window->PopupId = popup_ref.PopupId;
     }
 
-    const bool window_just_appearing_after_hidden_for_resize = (window->HiddenFrames == 1);
     if (window_just_appearing_after_hidden_for_resize && !(flags & ImGuiWindowFlags_ChildWindow))
         window->NavLastIds[0] = 0;
-    window->Appearing = (window_just_activated_by_user || window_just_appearing_after_hidden_for_resize);
-    window->CloseButton = (p_open != NULL);
 
     // Process SetNextWindow***() calls
-    if (window->Appearing)
-        SetWindowConditionAllowFlags(window, ImGuiCond_Appearing, true);
     bool window_pos_set_by_api = false, window_size_set_by_api = false;
     if (g.SetNextWindowPosCond)
     {
@@ -5380,13 +5381,13 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
 
         // SCROLLBAR STATUS
 
-        // Update scrollbar status (based on the Size that was effective during last frame or the auto-resized Size). We need to do this before manual resize (below) is effective.
+        // Update scrollbar status (based on the Size that was effective during last frame or the auto-resized Size). 
         if (!window->Collapsed)
         {
-            window->ScrollbarY = (flags & ImGuiWindowFlags_AlwaysVerticalScrollbar) || ((window->SizeContents.y > window->SizeFull.y) && !(flags & ImGuiWindowFlags_NoScrollbar));
+            window->ScrollbarY = (flags & ImGuiWindowFlags_AlwaysVerticalScrollbar) || ((window->SizeContents.y > window->SizeFullAtLastBegin.y) && !(flags & ImGuiWindowFlags_NoScrollbar));
-            window->ScrollbarX = (flags & ImGuiWindowFlags_AlwaysHorizontalScrollbar) || ((window->SizeContents.x > window->SizeFull.x - (window->ScrollbarY ? style.ScrollbarSize : 0.0f) - window->WindowPadding.x) && !(flags & ImGuiWindowFlags_NoScrollbar) && (flags & ImGuiWindowFlags_HorizontalScrollbar));
+            window->ScrollbarX = (flags & ImGuiWindowFlags_AlwaysHorizontalScrollbar) || ((window->SizeContents.x > window->SizeFullAtLastBegin.x - (window->ScrollbarY ? style.ScrollbarSize : 0.0f) - window->WindowPadding.x) && !(flags & ImGuiWindowFlags_NoScrollbar) && (flags & ImGuiWindowFlags_HorizontalScrollbar));
             if (window->ScrollbarX && !window->ScrollbarY)
-                window->ScrollbarY = (window->SizeContents.y > window->SizeFull.y + style.ScrollbarSize) && !(flags & ImGuiWindowFlags_NoScrollbar);
+                window->ScrollbarY = (window->SizeContents.y > window->SizeFullAtLastBegin.y + style.ScrollbarSize) && !(flags & ImGuiWindowFlags_NoScrollbar);
             window->ScrollbarSizes = ImVec2(window->ScrollbarY ? style.ScrollbarSize : 0.0f, window->ScrollbarX ? style.ScrollbarSize : 0.0f);
         }
 
@@ -5520,11 +5521,11 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
                     ImRect resize_rect(corner, corner + grip.InnerDir * grip_hover_size);
                     resize_rect.FixInverted();
                     bool hovered, held;
-                    ButtonBehavior(resize_rect, window->GetID((void*)resize_grip_n), &hovered, &held, ImGuiButtonFlags_FlattenChilds|ImGuiButtonFlags_NoNavFocus);
+                    ButtonBehavior(resize_rect, window->GetID((void*)resize_grip_n), &hovered, &held, ImGuiButtonFlags_FlattenChilds);
                     if (hovered || held)
                         g.MouseCursor = (resize_grip_n & 1) ? ImGuiMouseCursor_ResizeNESW : ImGuiMouseCursor_ResizeNWSE;
 
-                    if (g.HoveredWindow == window && held && g.IO.MouseDoubleClicked[0])
+                    if (g.HoveredWindow == window && held && g.IO.MouseDoubleClicked[0] && resize_grip_n == 0)
                     {
                         // Manual auto-fit when double-clicking
                         size_target = CalcSizeFullWithConstraint(window, size_auto_fit);
@@ -5537,6 +5538,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
                         ImVec2 corner_target = g.IO.MousePos - g.ActiveIdClickOffset + resize_rect.GetSize() * grip.CornerPos; // Corner of the window corresponding to our corner grip
                         CalcResizePosSizeFromAnyCorner(window, corner_target, grip.CornerPos, &pos_target, &size_target);
                     }
+                if (resize_grip_n == 0 || held || hovered)
                     resize_grip_col[resize_grip_n] = GetColorU32(held ? ImGuiCol_ResizeGripActive : hovered ? ImGuiCol_ResizeGripHovered : ImGuiCol_ResizeGrip);
                 }
                 for (int border_n = 0; border_n < resize_border_count; border_n++)
@@ -5582,6 +5584,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
                         }
                     }
                 }
+                PopID();
 
                 // Apply back modified position/size to window
                 if (size_target.x != FLT_MAX)
@@ -5594,6 +5597,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
                     window->Pos = window->PosFloat = ImVec2((float)(int)pos_target.x, (float)(int)pos_target.y);
                     MarkIniSettingsDirty(window);
                 }
+
                 window->Size = window->SizeFull;
                 title_bar_rect = window->TitleBarRect();
             }
@@ -5648,6 +5652,9 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
                 window->DrawList->AddLine(title_bar_rect.GetBL()+ImVec2(1,-1), title_bar_rect.GetBR()+ImVec2(-1,-1), GetColorU32(ImGuiCol_Border), style.FrameBorderSize);
         }
 
+        // Store a backup of SizeFull which we will use next frame to decide if we need scrollbars. 
+        window->SizeFullAtLastBegin = window->SizeFull;
+
         // Update ContentsRegionMax. All the variable it depends on are set above in this function.
         window->ContentsRegionRect.Min.x = -window->Scroll.x + window->WindowPadding.x;
         window->ContentsRegionRect.Min.y = -window->Scroll.y + window->WindowPadding.y + window->TitleBarHeight() + window->MenuBarHeight();

imgui_internal.h

@@ -794,6 +794,7 @@ struct IMGUI_API ImGuiWindow
     ImVec2                  Pos;                                // Position rounded-up to nearest pixel
     ImVec2                  Size;                               // Current size (==SizeFull or collapsed title bar size)
     ImVec2                  SizeFull;                           // Size when non collapsed
+    ImVec2                  SizeFullAtLastBegin;                // Copy of SizeFull at the end of Begin. This is the reference value we'll use on the next frame to decide if we need scrollbars.
     ImVec2                  SizeContents;                       // Size of contents (== extents reach of the drawing cursor) from previous frame
     ImVec2                  SizeContentsExplicit;               // Size of contents explicitly set by the user via SetNextWindowContentSize()
     ImRect                  ContentsRegionRect;                 // Maximum visible content position in window coordinates. ~~ (SizeContentsExplicit ? SizeContentsExplicit : Size - ScrollbarSizes) - CursorStartPos, per axis