Wip / borderless resizable

pthom · Jan 1, 2024 · 5bb0421 · 5bb0421
1 parent 440ae7e
commit 5bb0421
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diff --git a/src/hello_imgui/internal/backend_impls/abstract_runner.cpp b/src/hello_imgui/internal/backend_impls/abstract_runner.cpp
@@ -6,6 +6,7 @@
 #include "hello_imgui/internal/clock_seconds.h"
 #include "hello_imgui/internal/platform/ini_folder_locations.h"
 #include "imgui.h"
+#include "hello_imgui/internal/borderless_resizable.h"
 
 #include "hello_imgui/internal/imgui_global_context.h" // must be included before imgui_internal.h
 #include "imgui_internal.h"
@@ -504,6 +505,9 @@ void AbstractRunner::RenderGui()
     if (params.imGuiWindowParams.showMenuBar)
         Menu_StatusBar::ShowMenu(params);
 
+    if (params.appWindowParams.borderless) // Need to add params.appWindowParams.borderlessResizable
+        HandleBorderlessResizable(mWindow, mBackendWindowHelper.get());
+
     if (params.callbacks.ShowGui)
     {
         bool wantAutoSize = WantAutoSize();

diff --git a/src/hello_imgui/internal/borderless_resizable.cpp b/src/hello_imgui/internal/borderless_resizable.cpp
@@ -0,0 +1,88 @@
+#define IMGUI_DEFINE_MATH_OPERATORS
+#include "hello_imgui/internal/borderless_resizable.h"
+#include "hello_imgui/hello_imgui.h"
+#include "imgui_internal.h"
+
+
+namespace HelloImGui
+{
+    void HandleBorderlessResizable(
+        BackendApi::WindowPointer window,
+        BackendApi::IBackendWindowHelper * backendWindowHelper)
+    {
+        ImVec2 winSize = ImGui::GetWindowSize();
+        auto highlightColor = ImGui::GetColorU32(ImGuiCol_FrameBgHovered, 0.8f);
+
+        // Drag zone at the top of the window
+        {
+            ImVec2 topLeftCorner = ImGui::GetMainViewport()->Pos;
+            ImVec2 bottomRightCorner = topLeftCorner + ImVec2(winSize.x, HelloImGui::EmSize(1.5f));
+            ImRect dragRect = ImRect(topLeftCorner, bottomRightCorner);
+
+            ImVec2 mousePos = ImGui::GetIO().MousePos;
+            bool isMouseInDragZone = dragRect.Contains(mousePos);
+
+            // highlight drag zone if hovering
+            if (isMouseInDragZone)
+            {
+                ImGui::GetForegroundDrawList()->AddRectFilled(
+                    dragRect.Min,
+                    dragRect.Max,
+                    highlightColor
+                );
+            }
+
+            static bool isDragging = false;
+            if (ImGui::IsMouseDragging(0) && isMouseInDragZone)
+                isDragging = true;
+            if (ImGui::IsMouseReleased(0))
+                isDragging = false;
+
+            if (isDragging)
+            {
+                ImVec2 dragDelta = ImGui::GetMouseDragDelta(0);
+                ImGui::ResetMouseDragDelta(0);
+
+                // move window
+                {
+                    auto windowBounds = backendWindowHelper->GetWindowBounds(window);
+                    windowBounds.position[0] += (int)dragDelta.x;
+                    windowBounds.position[1] += (int)dragDelta.y;
+                    backendWindowHelper->SetWindowBounds(window, windowBounds);
+                }
+            }
+        }
+
+        // Drag zone at the bottom-right of the window
+        // This is still a draft, which needs to be completed
+        // and probably refactored: there is too much repetition between the two blocks of code
+        {
+            ImVec2 bottomRightCorner = ImGui::GetMainViewport()->Pos + ImGui::GetMainViewport()->Size;
+            ImVec2 topLeftCorner = bottomRightCorner - HelloImGui::EmToVec2(1.5f, 1.5f);
+
+            // Small triangle in the bottom-right corner
+            ImVec2 t1 = bottomRightCorner;
+            ImVec2 t2 = bottomRightCorner - HelloImGui::EmToVec2(1.5f, 0.f);
+            ImVec2 t3 = bottomRightCorner - HelloImGui::EmToVec2(0.f, 1.5f);
+
+            ImRect dragRect = ImRect(topLeftCorner, bottomRightCorner);
+
+            ImVec2 mousePos = ImGui::GetIO().MousePos;
+            bool isMouseInDragZone = dragRect.Contains(mousePos);
+
+            // highlight drag zone if hovering
+            if (isMouseInDragZone)
+            {
+                ImGui::GetForegroundDrawList()->AddTriangleFilled(
+                    t1, t2, t3,
+                    highlightColor
+                );
+            }
+
+            // To be completed...
+
+        }
+    }
+}
+
+
diff --git a/src/hello_imgui/internal/borderless_resizable.h b/src/hello_imgui/internal/borderless_resizable.h
@@ -0,0 +1,10 @@
+#pragma once
+#include "hello_imgui/runner_params.h"
+#include "hello_imgui/internal/backend_impls/backend_window_helper/backend_window_helper.h"
+
+namespace HelloImGui
+{
+    void HandleBorderlessResizable(
+        BackendApi::WindowPointer window,
+        BackendApi::IBackendWindowHelper * backendWindowHelper);
+}
diff --git a/src/hello_imgui_demos/hello_imgui_demodocking/hello_imgui_demodocking.main.cpp b/src/hello_imgui_demos/hello_imgui_demodocking/hello_imgui_demodocking.main.cpp
@@ -498,6 +498,7 @@ int main(int, char**)
     runnerParams.imGuiWindowParams.menuAppTitle = "Docking Demo";
     runnerParams.appWindowParams.windowGeometry.size = {1000, 900};
     runnerParams.appWindowParams.restorePreviousGeometry = true;
+    runnerParams.appWindowParams.borderless = true;
 
     // Load additional font
     runnerParams.callbacks.LoadAdditionalFonts = LoadFonts;