Updated ImGui.

3rdparty/dear-imgui/imgui.cpp

@@ -893,8 +893,12 @@ CODE
 #endif
 
 // When using CTRL+TAB (or Gamepad Square+L/R) we delay the visual a little in order to reduce visual noise doing a fast switch.
-static const float NAV_WINDOWING_HIGHLIGHT_DELAY   = 0.20f; // Time before the highlight and screen dimming starts fading in
-static const float NAV_WINDOWING_LIST_APPEAR_DELAY = 0.15f; // Time before the window list starts to appear
+static const float NAV_WINDOWING_HIGHLIGHT_DELAY            = 0.20f;    // Time before the highlight and screen dimming starts fading in
+static const float NAV_WINDOWING_LIST_APPEAR_DELAY          = 0.15f;    // Time before the window list starts to appear
+
+// Window resizing from edges (when io.ConfigResizeWindowsFromEdges = true)
+static const float RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS = 4.0f;     // Extend outside and inside windows. Affect FindHoveredWindow().
+static const float RESIZE_WINDOWS_FROM_EDGES_FEEDBACK_TIMER = 0.04f;    // Reduce visual noise by only highlighting the border after a certain time.
 
 //-------------------------------------------------------------------------
 // [SECTION] FORWARD DECLARATIONS
@@ -2933,6 +2937,10 @@ static void ImGui::UpdateMouseInputs()
 {
     ImGuiContext& g = *GImGui;
 
+    // Round mouse position to avoid spreading non-rounded position (e.g. UpdateManualResize doesn't support them well)
+    if (IsMousePosValid(&g.IO.MousePos))
+        g.IO.MousePos = ImFloor(g.IO.MousePos);
+
     // If mouse just appeared or disappeared (usually denoted by -FLT_MAX components) we cancel out movement in MouseDelta
     if (IsMousePosValid(&g.IO.MousePos) && IsMousePosValid(&g.IO.MousePosPrev))
         g.IO.MouseDelta = g.IO.MousePos - g.IO.MousePosPrev;
@@ -3702,6 +3710,8 @@ static void FindHoveredWindow()
     if (g.MovingWindow && !(g.MovingWindow->Flags & ImGuiWindowFlags_NoInputs))
         hovered_window = g.MovingWindow;
 
+    ImVec2 padding_regular = g.Style.TouchExtraPadding;
+    ImVec2 padding_for_resize_from_edges = g.IO.ConfigResizeWindowsFromEdges ? ImMax(g.Style.TouchExtraPadding, ImVec2(RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS, RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS)) : padding_regular;
     for (int i = g.Windows.Size - 1; i >= 0 && hovered_window == NULL; i--)
     {
         ImGuiWindow* window = g.Windows[i];
@@ -3711,14 +3721,19 @@ static void FindHoveredWindow()
             continue;
 
         // Using the clipped AABB, a child window will typically be clipped by its parent (not always)
-        ImRect bb(window->OuterRectClipped.Min - g.Style.TouchExtraPadding, window->OuterRectClipped.Max + g.Style.TouchExtraPadding);
-        if (bb.Contains(g.IO.MousePos))
-        {
-            if (hovered_window == NULL)
-                hovered_window = window;
-            if (hovered_window)
-                break;
-        }
+        ImRect bb(window->OuterRectClipped);
+        if ((window->Flags & ImGuiWindowFlags_ChildWindow) || (window->Flags & ImGuiWindowFlags_NoResize))
+            bb.Expand(padding_regular);
+        else
+            bb.Expand(padding_for_resize_from_edges);
+        if (!bb.Contains(g.IO.MousePos))
+            continue;
+
+        // Those seemingly unnecessary extra tests are because the code here is a little different in viewport/docking branches.
+        if (hovered_window == NULL)
+            hovered_window = window;
+        if (hovered_window)
+            break;
     }
 
     g.HoveredWindow = hovered_window;
@@ -4371,10 +4386,10 @@ static ImRect GetResizeBorderRect(ImGuiWindow* window, int border_n, float perp_
 {
     ImRect rect = window->Rect();
     if (thickness == 0.0f) rect.Max -= ImVec2(1,1);
-    if (border_n == 0) return ImRect(rect.Min.x + perp_padding, rect.Min.y,                rect.Max.x - perp_padding, rect.Min.y + thickness);
-    if (border_n == 1) return ImRect(rect.Max.x - thickness,    rect.Min.y + perp_padding, rect.Max.x,                rect.Max.y - perp_padding);
-    if (border_n == 2) return ImRect(rect.Min.x + perp_padding, rect.Max.y - thickness,    rect.Max.x - perp_padding, rect.Max.y);
-    if (border_n == 3) return ImRect(rect.Min.x,                rect.Min.y + perp_padding, rect.Min.x + thickness,    rect.Max.y - perp_padding);
+    if (border_n == 0) return ImRect(rect.Min.x + perp_padding, rect.Min.y - thickness,    rect.Max.x - perp_padding, rect.Min.y + thickness);
+    if (border_n == 1) return ImRect(rect.Max.x - thickness,    rect.Min.y + perp_padding, rect.Max.x + thickness,    rect.Max.y - perp_padding);
+    if (border_n == 2) return ImRect(rect.Min.x + perp_padding, rect.Max.y - thickness,    rect.Max.x - perp_padding, rect.Max.y + thickness);
+    if (border_n == 3) return ImRect(rect.Min.x - thickness,    rect.Min.y + perp_padding, rect.Min.x + thickness,    rect.Max.y - perp_padding);
     IM_ASSERT(0);
     return ImRect();
 }
@@ -4386,10 +4401,13 @@ static void ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
     ImGuiWindowFlags flags = window->Flags;
     if ((flags & ImGuiWindowFlags_NoResize) || (flags & ImGuiWindowFlags_AlwaysAutoResize) || window->AutoFitFramesX > 0 || window->AutoFitFramesY > 0)
         return;
+    if (window->WasActive == false) // Early out to avoid running this code for e.g. an hidden implicit Debug window.
+        return;
 
     const int resize_border_count = g.IO.ConfigResizeWindowsFromEdges ? 4 : 0;
     const float grip_draw_size = (float)(int)ImMax(g.FontSize * 1.35f, window->WindowRounding + 1.0f + g.FontSize * 0.2f);
-    const float grip_hover_size = (float)(int)(grip_draw_size * 0.75f);
+    const float grip_hover_inner_size = (float)(int)(grip_draw_size * 0.75f);
+    const float grip_hover_outer_size = g.IO.ConfigResizeWindowsFromEdges ? RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS : 0.0f;
 
     ImVec2 pos_target(FLT_MAX, FLT_MAX);
     ImVec2 size_target(FLT_MAX, FLT_MAX);
@@ -4402,11 +4420,12 @@ static void ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
         const ImVec2 corner = ImLerp(window->Pos, window->Pos + window->Size, grip.CornerPos);
 
         // Using the FlattenChilds button flag we make the resize button accessible even if we are hovering over a child window
-        ImRect resize_rect(corner, corner + grip.InnerDir * grip_hover_size);
+        ImRect resize_rect(corner - grip.InnerDir * grip_hover_outer_size, corner + grip.InnerDir * grip_hover_inner_size);
         if (resize_rect.Min.x > resize_rect.Max.x) ImSwap(resize_rect.Min.x, resize_rect.Max.x);
         if (resize_rect.Min.y > resize_rect.Max.y) ImSwap(resize_rect.Min.y, resize_rect.Max.y);
         bool hovered, held;
         ButtonBehavior(resize_rect, window->GetID((void*)(intptr_t)resize_grip_n), &hovered, &held, ImGuiButtonFlags_FlattenChildren | ImGuiButtonFlags_NoNavFocus);
+        //GetOverlayDrawList()->AddRect(resize_rect.Min, resize_rect.Max, IM_COL32(255, 255, 0, 255));
         if (hovered || held)
             g.MouseCursor = (resize_grip_n & 1) ? ImGuiMouseCursor_ResizeNESW : ImGuiMouseCursor_ResizeNWSE;
 
@@ -4420,7 +4439,7 @@ static void ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
         {
             // Resize from any of the four corners
             // We don't use an incremental MouseDelta but rather compute an absolute target size based on mouse position
-            ImVec2 corner_target = g.IO.MousePos - g.ActiveIdClickOffset + resize_rect.GetSize() * grip.CornerPos; // Corner of the window corresponding to our corner grip
+            ImVec2 corner_target = g.IO.MousePos - g.ActiveIdClickOffset + ImLerp(grip.InnerDir * grip_hover_outer_size, grip.InnerDir * -grip_hover_inner_size, 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)
@@ -4428,12 +4447,11 @@ static void ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
     }
     for (int border_n = 0; border_n < resize_border_count; border_n++)
     {
-        const float BORDER_SIZE = 5.0f;          // FIXME: Only works _inside_ window because of HoveredWindow check.
-        const float BORDER_APPEAR_TIMER = 0.05f; // Reduce visual noise
         bool hovered, held;
-        ImRect border_rect = GetResizeBorderRect(window, border_n, grip_hover_size, BORDER_SIZE);
+        ImRect border_rect = GetResizeBorderRect(window, border_n, grip_hover_inner_size, RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS);
         ButtonBehavior(border_rect, window->GetID((void*)(intptr_t)(border_n + 4)), &hovered, &held, ImGuiButtonFlags_FlattenChildren);
-        if ((hovered && g.HoveredIdTimer > BORDER_APPEAR_TIMER) || held)
+        //GetOverlayDrawList()->AddRect(border_rect.Min, border_rect.Max, IM_COL32(255, 255, 0, 255));
+        if ((hovered && g.HoveredIdTimer > RESIZE_WINDOWS_FROM_EDGES_FEEDBACK_TIMER) || held)
         {
             g.MouseCursor = (border_n & 1) ? ImGuiMouseCursor_ResizeEW : ImGuiMouseCursor_ResizeNS;
             if (held) *border_held = border_n;
@@ -4442,10 +4460,10 @@ static void ImGui::UpdateManualResize(ImGuiWindow* window, const ImVec2& size_au
         {
             ImVec2 border_target = window->Pos;
             ImVec2 border_posn;
-            if (border_n == 0) { border_posn = ImVec2(0, 0); border_target.y = (g.IO.MousePos.y - g.ActiveIdClickOffset.y); }
-            if (border_n == 1) { border_posn = ImVec2(1, 0); border_target.x = (g.IO.MousePos.x - g.ActiveIdClickOffset.x + BORDER_SIZE); }
-            if (border_n == 2) { border_posn = ImVec2(0, 1); border_target.y = (g.IO.MousePos.y - g.ActiveIdClickOffset.y + BORDER_SIZE); }
-            if (border_n == 3) { border_posn = ImVec2(0, 0); border_target.x = (g.IO.MousePos.x - g.ActiveIdClickOffset.x); }
+            if (border_n == 0) { border_posn = ImVec2(0, 0); border_target.y = (g.IO.MousePos.y - g.ActiveIdClickOffset.y + RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS); }
+            if (border_n == 1) { border_posn = ImVec2(1, 0); border_target.x = (g.IO.MousePos.x - g.ActiveIdClickOffset.x + RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS); }
+            if (border_n == 2) { border_posn = ImVec2(0, 1); border_target.y = (g.IO.MousePos.y - g.ActiveIdClickOffset.y + RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS); }
+            if (border_n == 3) { border_posn = ImVec2(0, 0); border_target.x = (g.IO.MousePos.x - g.ActiveIdClickOffset.x + RESIZE_WINDOWS_FROM_EDGES_HALF_THICKNESS); }
             CalcResizePosSizeFromAnyCorner(window, border_target, border_posn, &pos_target, &size_target);
         }
     }