Docking: removed io.ConfigDockingWithShift option. (#2109)

docs/CHANGELOG.txt

@@ -128,6 +128,8 @@ Other Changes:
 
 Docking Branch:
 
+- [Breaking] Removed io.ConfigDockingWithShift config option. Behavior always equivalent to having the
+  option set to false (dock/undock by default, hold shift to avoid docking). (#2109)
 - Docking: DockSpace() returns its node ID.
 - Docking: Dockspace() never draws a background. (#3924)
 - Docking: undocking nodes/windows covering most of the monitor max their size down to 90% to ease further manipulations.

imgui.cpp

@@ -1101,7 +1101,6 @@ ImGuiIO::ImGuiIO()
 
     // Docking options (when ImGuiConfigFlags_DockingEnable is set)
     ConfigDockingNoSplit = false;
-    ConfigDockingWithShift = false;
     ConfigDockingAlwaysTabBar = false;
     ConfigDockingTransparentPayload = false;
 
@@ -6784,7 +6783,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         {
             // Docking: Dragging a dockable window (or any of its child) turns it into a drag and drop source.
             // We need to do this _before_ we overwrite window->DC.LastItemId below because BeginDockableDragDropSource() also overwrites it.
-            if ((g.MovingWindow == window) && (g.IO.ConfigDockingWithShift == g.IO.KeyShift))
+            if (g.MovingWindow == window && g.IO.KeyShift == false)
                 if ((window->RootWindowDockTree->Flags & ImGuiWindowFlags_NoDocking) == 0)
                     BeginDockableDragDropSource(window);
 
@@ -14200,9 +14199,9 @@ static void ImGui::DockNodePreviewDockSetup(ImGuiWindow* host_window, ImGuiDockN
             }
         }
 
-    // When docking without holding Shift, we only allow and preview docking when hovering over a drop rect or over the title bar
+    // We only allow and preview docking when hovering over a drop rect or over the title bar
     data->IsDropAllowed = (data->SplitDir != ImGuiDir_None) || (data->IsCenterAvailable);
-    if (!is_explicit_target && !data->IsSplitDirExplicit && !g.IO.ConfigDockingWithShift)
+    if (!is_explicit_target && !data->IsSplitDirExplicit)
         data->IsDropAllowed = false;
 
     // Calculate split area
@@ -15472,7 +15471,7 @@ void ImGui::BeginDockableDragDropSource(ImGuiWindow* window)
     window->DC.LastItemId = window->MoveId;
     window = window->RootWindowDockTree;
     IM_ASSERT((window->Flags & ImGuiWindowFlags_NoDocking) == 0);
-    bool is_drag_docking = (g.IO.ConfigDockingWithShift) || ImRect(0, 0, window->SizeFull.x, GetFrameHeight()).Contains(g.ActiveIdClickOffset);
+    bool is_drag_docking = ImRect(0, 0, window->SizeFull.x, GetFrameHeight()).Contains(g.ActiveIdClickOffset); // FIXME-DOCKING: Need to make this stateful and explicit
     if (is_drag_docking && BeginDragDropSource(ImGuiDragDropFlags_SourceNoPreviewTooltip | ImGuiDragDropFlags_SourceNoHoldToOpenOthers | ImGuiDragDropFlags_SourceAutoExpirePayload))
     {
         SetDragDropPayload(IMGUI_PAYLOAD_TYPE_WINDOW, &window, sizeof(window));
@@ -15533,7 +15532,7 @@ void ImGui::BeginDockableDragDropTarget(ImGuiWindow* window)
         }
 
         const ImRect explicit_target_rect = (node && node->TabBar && !node->IsHiddenTabBar() && !node->IsNoTabBar()) ? node->TabBar->BarRect : ImRect(window->Pos, window->Pos + ImVec2(window->Size.x, GetFrameHeight()));
-        const bool is_explicit_target = g.IO.ConfigDockingWithShift || IsMouseHoveringRect(explicit_target_rect.Min, explicit_target_rect.Max);
+        const bool is_explicit_target = IsMouseHoveringRect(explicit_target_rect.Min, explicit_target_rect.Max);
 
         // Preview docking request and find out split direction/ratio
         //const bool do_preview = true;     // Ignore testing for payload->IsPreview() which removes one frame of delay, but breaks overlapping drop targets within the same window.

imgui.h

@@ -759,8 +759,8 @@ namespace ImGui
     // Docking
     // [BETA API] Enable with io.ConfigFlags |= ImGuiConfigFlags_DockingEnable.
     // Note: You can use most Docking facilities without calling any API. You DO NOT need to call DockSpace() to use Docking!
-    // - To dock windows: if io.ConfigDockingWithShift == false (default) drag window from their title bar.
+    // - Drag from window title bar or their tab to dock/undock. Hold SHIFT to disable docking.
-    // - To dock windows: if io.ConfigDockingWithShift == true: hold SHIFT anywhere while moving windows.
+    // - Drag from window menu button (upper-left button) to undock an entire node (all windows).
     // About DockSpace:
     // - Use DockSpace() to create an explicit dock node _within_ an existing window. See Docking demo for details.
     // - DockSpace() needs to be submitted _before_ any window they can host. If you use a dockspace, submit it early in your app.
@@ -1854,7 +1854,6 @@ struct ImGuiIO
 
     // Docking options (when ImGuiConfigFlags_DockingEnable is set)
     bool        ConfigDockingNoSplit;           // = false          // Simplified docking mode: disable window splitting, so docking is limited to merging multiple windows together into tab-bars.
-    bool        ConfigDockingWithShift;         // = false          // Enable docking with holding Shift key (reduce visual noise, allows dropping in wider space)
     bool        ConfigDockingAlwaysTabBar;      // = false          // [BETA] [FIXME: This currently creates regression with auto-sizing and general overhead] Make every single floating window display within a docking node.
     bool        ConfigDockingTransparentPayload;// = false          // [BETA] Make window or viewport transparent when docking and only display docking boxes on the target viewport. Useful if rendering of multiple viewport cannot be synced. Best used with ConfigViewportsNoAutoMerge.
 

imgui_demo.cpp

@@ -456,14 +456,12 @@ void ImGui::ShowDemoWindow(bool* p_open)
             ImGui::SameLine(); HelpMarker("Instruct backend to not alter mouse cursor shape and visibility.");
 
             ImGui::CheckboxFlags("io.ConfigFlags: DockingEnable", &io.ConfigFlags, ImGuiConfigFlags_DockingEnable);
-            ImGui::SameLine(); HelpMarker(io.ConfigDockingWithShift ? "[beta] Use SHIFT to dock window into each others." : "[beta] Drag from title bar to dock windows into each others.");
+            ImGui::SameLine(); HelpMarker("Drag from window title bar or their tab to dock/undock. Hold SHIFT to disable docking.\n\nDrag from window menu button (upper-left button) to undock an entire node (all windows).");
             if (io.ConfigFlags & ImGuiConfigFlags_DockingEnable)
             {
                 ImGui::Indent();
                 ImGui::Checkbox("io.ConfigDockingNoSplit", &io.ConfigDockingNoSplit);
                 ImGui::SameLine(); HelpMarker("Simplified docking mode: disable window splitting, so docking is limited to merging multiple windows together into tab-bars.");
-                ImGui::Checkbox("io.ConfigDockingWithShift", &io.ConfigDockingWithShift);
-                ImGui::SameLine(); HelpMarker("Enable docking when holding Shift only (allows to drop in wider space, reduce visual noise)");
                 ImGui::Checkbox("io.ConfigDockingAlwaysTabBar", &io.ConfigDockingAlwaysTabBar);
                 ImGui::SameLine(); HelpMarker("Create a docking node and tab-bar on single floating windows.");
                 ImGui::Checkbox("io.ConfigDockingTransparentPayload", &io.ConfigDockingTransparentPayload);
@@ -5741,7 +5739,6 @@ void ImGui::ShowAboutWindow(bool* p_open)
         if (io.ConfigViewportsNoDecoration)                             ImGui::Text("io.ConfigViewportsNoDecoration");
         if (io.ConfigViewportsNoDefaultParent)                          ImGui::Text("io.ConfigViewportsNoDefaultParent");
         if (io.ConfigDockingNoSplit)                                    ImGui::Text("io.ConfigDockingNoSplit");
-        if (io.ConfigDockingWithShift)                                  ImGui::Text("io.ConfigDockingWithShift");
         if (io.ConfigDockingAlwaysTabBar)                               ImGui::Text("io.ConfigDockingAlwaysTabBar");
         if (io.ConfigDockingTransparentPayload)                         ImGui::Text("io.ConfigDockingTransparentPayload");
         if (io.ConfigMacOSXBehaviors)                                   ImGui::Text("io.ConfigMacOSXBehaviors");
@@ -7463,7 +7460,7 @@ static void ShowExampleAppCustomRendering(bool* p_open)
 
 // Demonstrate using DockSpace() to create an explicit docking node within an existing window.
 // Note that you dock windows into each others _without_ a dockspace, by just clicking on
-// a window title bar and moving it (+ hold SHIFT if io.ConfigDockingWithShift is set).
+// a window title bar or tab and moving it.
 // DockSpace() and DockSpaceOverViewport() are only useful to construct a central docking
 // location for your application.
 void ShowExampleAppDockSpace(bool* p_open)
@@ -7556,11 +7553,10 @@ void ShowExampleAppDockSpace(bool* p_open)
             ImGui::EndMenu();
         }
         HelpMarker(
-            "When docking is enabled, you can ALWAYS dock MOST window into another! Try it now!" "\n\n"
+            "When docking is enabled, you can ALWAYS dock MOST window into another! Try it now!" "\n"
-            " > if io.ConfigDockingWithShift==false (default):" "\n"
+            "- Drag from window title bar or their tab to dock/undock." "\n"
-            "   drag windows from title bar to dock" "\n"
+            "- Drag from window menu button (upper-left button) to undock an entire node (all windows)." "\n"
-            " > if io.ConfigDockingWithShift==true:" "\n"
+            "- Hold SHIFT to disable docking." "\n"
-            "   drag windows from anywhere and hold Shift to dock" "\n\n"
             "This demo app has nothing to do with it!" "\n\n"
             "This demo app only demonstrate the use of ImGui::DockSpace() which allows you to manually create a docking node _within_ another window. This is useful so you can decorate your main application window (e.g. with a menu bar)." "\n\n"
             "ImGui::DockSpace() comes with one hard constraint: it needs to be submitted _before_ any window which may be docked into it. Therefore, if you use a dock spot as the central point of your application, you'll probably want it to be part of the very first window you are submitting to imgui every frame." "\n\n"

imgui_widgets.cpp

@@ -7920,20 +7920,17 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
     else if (held && !tab_appearing && IsMouseDragging(0))
     {
         // Drag and drop: re-order tabs
-        int drag_dir = 0;
         float drag_distance_from_edge_x = 0.0f;
         if (!g.DragDropActive && ((tab_bar->Flags & ImGuiTabBarFlags_Reorderable) || (docked_window != NULL)))
         {
             // While moving a tab it will jump on the other side of the mouse, so we also test for MouseDelta.x
             if (g.IO.MouseDelta.x < 0.0f && g.IO.MousePos.x < bb.Min.x)
             {
-                drag_dir = -1;
                 drag_distance_from_edge_x = bb.Min.x - g.IO.MousePos.x;
                 TabBarQueueReorderFromMousePos(tab_bar, tab, g.IO.MousePos);
             }
             else if (g.IO.MouseDelta.x > 0.0f && g.IO.MousePos.x > bb.Max.x)
             {
-                drag_dir = +1;
                 drag_distance_from_edge_x = g.IO.MousePos.x - bb.Max.x;
                 TabBarQueueReorderFromMousePos(tab_bar, tab, g.IO.MousePos);
             }
@@ -7955,7 +7952,7 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
                 if (distance_from_edge_y >= threshold_y)
                     undocking_tab = true;
                 if (drag_distance_from_edge_x > threshold_x)
-                    if ((drag_dir < 0 && tab_bar->GetTabOrder(tab) == 0) || (drag_dir > 0 && tab_bar->GetTabOrder(tab) == tab_bar->Tabs.Size - 1))
+                    if ((tab_bar->GetTabOrder(tab) == 0) || (tab_bar->GetTabOrder(tab) == tab_bar->Tabs.Size - 1))
                         undocking_tab = true;
             }