New GRID in views to perrorm MousePointer snap to GRID

For this new MousePointer to snap to grid, a Grid specific for each view is necessary. Grid for moving is orthographic (with an aspect ratio), and grid for mixing or rotation is in polar coordinates. Rendering is done with new Primitives. The entire calculation of grab coordinates is changed to be able to snap to grid coordinates in all circumstances.

src/UserInterfaceManager.cpp

@@ -505,7 +505,6 @@ void UserInterface::handleMouse()
                 // initiate Mouse pointer from position at mouse down event
                 MousePointer::manager().setActiveMode( (Pointer::Mode) Settings::application.mouse_pointer );
                 MousePointer::manager().active()->setStrength( Settings::application.mouse_pointer_strength[Settings::application.mouse_pointer] );
-                MousePointer::manager().active()->initiate(mousepos);
 
                 // ask the view what was picked
                 picked = Mixer::manager().view()->pick(mousepos);
@@ -517,6 +516,9 @@ void UserInterface::handleMouse()
                 }
                 // something was picked
                 else {
+                    // initiate the pointer effect
+                    MousePointer::manager().active()->initiate(mousepos);
+
                     // get if a source was picked
                     Source *s = Mixer::manager().findSource(picked.first);
                     if (s != nullptr)
@@ -585,42 +587,37 @@ void UserInterface::handleMouse()
             if (view_drag == Mixer::manager().view()) {
 
                 if ( picked.first != nullptr ) {
+
                     // Apply Mouse pointer filter
+                    // + scrollwheel changes strength
+                    if ( io.MouseWheel != 0) {
+                        MousePointer::manager().active()->incrementStrength(0.1 * io.MouseWheel);
+                        Settings::application.mouse_pointer_strength[Settings::application.mouse_pointer] = MousePointer::manager().active()->strength();
+                    }
                     MousePointer::manager().active()->update(mousepos, 1.f / ( MAX(io.Framerate, 1.f) ));
 
                     // action on current source
+                    View::Cursor c;
                     Source *current = Mixer::manager().currentSource();
                     if (current)
                     {
-                        if (!shift_modifier_active) {
-                            // grab others from selection
-                            for (auto it = Mixer::selection().begin(); it != Mixer::selection().end(); ++it) {
-                                if ( *it != current && !(*it)->locked() )
-                                    Mixer::manager().view()->grab(*it, mouseclic[ImGuiMouseButton_Left],
-                                                                  MousePointer::manager().active()->pos(), picked);
-                            }
-                        }
                         // grab current sources
-                        View::Cursor c = Mixer::manager().view()->grab(current, mouseclic[ImGuiMouseButton_Left],
-                                                                       MousePointer::manager().active()->pos(), picked);
-                        SetMouseCursor(io.MousePos, c);
-
-                        // scrollwheel changes strength of Mouse Pointer
-                        if ( io.MouseWheel != 0) {
-                            MousePointer::manager().active()->setStrength( MousePointer::manager().active()->strength() + 0.1 * io.MouseWheel);
-                            Settings::application.mouse_pointer_strength[Settings::application.mouse_pointer] = MousePointer::manager().active()->strength();
-                        }
-
-                        // Draw Mouse pointer effect
-                        MousePointer::manager().active()->draw();
+                        c = Mixer::manager().view()->grab(current, mouseclic[ImGuiMouseButton_Left],
+                                                          MousePointer::manager().active()->pos(), picked);
                     }
                     // action on other (non-source) elements in the view
                     else
                     {
-                        View::Cursor c = Mixer::manager().view()->grab(nullptr, mouseclic[ImGuiMouseButton_Left], mousepos, picked);
-                        SetMouseCursor(io.MousePos, c);
+                        // grab picked object
+                        c = Mixer::manager().view()->grab(nullptr, mouseclic[ImGuiMouseButton_Left],
+                                                          MousePointer::manager().active()->pos(), picked);
                     }
 
+                    // Set cursor appearance
+                    SetMouseCursor(io.MousePos, c);
+
+                    // Draw Mouse pointer effect
+                    MousePointer::manager().active()->draw();
 
                 }
                 // Selection area
@@ -650,6 +647,7 @@ void UserInterface::handleMouse()
         if (mousedown || view_drag)
             Mixer::manager().view()->terminate();
 
+
         view_drag = nullptr;
         mousedown = false;
     }
@@ -667,6 +665,7 @@ void UserInterface::handleMouse()
         mousedown = false;
         picked = { nullptr, glm::vec2(0.f) };
         Mixer::manager().view()->terminate();
+        MousePointer::manager().active()->terminate();
         SetMouseCursor(io.MousePos);
     }
 }
@@ -4622,7 +4621,7 @@ void Navigator::RenderMousePointerSelector(const ImVec2 &size)
 {
     ImGuiContext& g = *GImGui;
     ImVec2 top = ImGui::GetCursorPos();
-
+    bool enabled = Settings::application.current_view < View::TRANSITION;
     ///
     /// interactive button of the given size: show menu if clic or mouse over
     ///
@@ -4630,13 +4629,17 @@ void Navigator::RenderMousePointerSelector(const ImVec2 &size)
     if ( ImGui::InvisibleButton("##MenuMousePointerButton", size) || ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup) ) {
 
         counter_menu_timeout=0;
-        ImGui::OpenPopup( "MenuMousePointer" );
+        if (enabled)
+            ImGui::OpenPopup( "MenuMousePointer" );
     }
     ImVec2 bottom = ImGui::GetCursorScreenPos();
 
     // Change color of icons depending on context menu status
     const ImVec4* colors = ImGui::GetStyle().Colors;
-    ImGui::PushStyleColor( ImGuiCol_Text, ImGui::IsPopupOpen("MenuMousePointer") ? colors[ImGuiCol_DragDropTarget] : colors[ImGuiCol_Text] );
+    if (enabled)
+        ImGui::PushStyleColor( ImGuiCol_Text, ImGui::IsPopupOpen("MenuMousePointer") ? colors[ImGuiCol_DragDropTarget] : colors[ImGuiCol_Text] );
+    else
+        ImGui::PushStyleColor( ImGuiCol_Text, colors[ImGuiCol_TextDisabled] );
 
     // Draw centered icon of Mouse pointer
     ImVec2 margin = (size - ImVec2(g.FontSize, g.FontSize)) * 0.42f;
@@ -4709,6 +4712,8 @@ void Navigator::RenderMainPannelSettings()
         if (ImGui::RadioButton("##Color", &v, v)){
             Settings::application.accent_color = (v+1)%3;
             ImGuiToolkit::SetAccentColor(static_cast<ImGuiToolkit::accent_color>(Settings::application.accent_color));
+            // ask Views to update
+            View::need_deep_update_++;
         }
         if (ImGui::IsItemHovered())
             ImGuiToolkit::ToolTip("Change accent color");
@@ -4719,6 +4724,9 @@ void Navigator::RenderMainPannelSettings()
             Settings::application.scale = CLAMP(Settings::application.scale, 0.5f, 2.f);
             ImGui::GetIO().FontGlobalScale = Settings::application.scale;
         }
+        ImGuiToolkit::Indication("Scale the mouse pointer guiding grid to match aspect ratio.", ICON_FA_BORDER_NONE);
+        ImGui::SameLine();
+        ImGuiToolkit::ButtonSwitch( "Scaled grid", &Settings::application.proportional_grid);
 
         //
         // Recording preferences