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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| #define IMGUI_DEFINE_MATH_OPERATORS | ||
| #include "hello_imgui/internal/borderless_movable.h" | ||
| #include "hello_imgui/hello_imgui.h" | ||
| #include "imgui_internal.h" | ||
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| namespace HelloImGui | ||
| { | ||
| void HandleBorderlessMovable( | ||
| BackendApi::WindowPointer window, | ||
| BackendApi::IBackendWindowHelper * backendWindowHelper, | ||
| bool borderlessMovable, | ||
| bool borderlessResizable, | ||
| ImVec4 borderlessHighlightColor) | ||
| { | ||
| ImU32 highlightColorU32 = ImGui::GetColorU32(borderlessHighlightColor); | ||
| if (borderlessHighlightColor.w == 0.f) | ||
| highlightColorU32 = ImGui::GetColorU32(ImGuiCol_TitleBg, 0.6f); | ||
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| // Drag zone at the top of the window | ||
| if (borderlessMovable) | ||
| { | ||
| ImVec2 dragSize(ImGui::GetMainViewport()->Size.x, ImGui::GetFontSize() * 1.5f); | ||
| ImRect dragArea(ImGui::GetMainViewport()->Pos, ImGui::GetMainViewport()->Pos + dragSize); | ||
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| // Update dragging state | ||
| ImVec2 mousePos = ImGui::GetMousePos(); | ||
| static bool isDragging = false; | ||
| if (dragArea.Contains(mousePos) && !isDragging && ImGui::IsMouseDragging(ImGuiMouseButton_Left)) | ||
| { | ||
| isDragging = true; | ||
| } | ||
| if (!ImGui::IsMouseDragging(ImGuiMouseButton_Left) && isDragging) | ||
| isDragging = false; | ||
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| // Draw drag zone | ||
| if (dragArea.Contains(mousePos) || isDragging) | ||
| { | ||
| ImGui::GetForegroundDrawList()->AddRectFilled( | ||
| dragArea.Min, | ||
| dragArea.Max, | ||
| highlightColorU32 | ||
| ); | ||
| } | ||
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| // Move window if dragging | ||
| if (isDragging) | ||
| { | ||
| ImVec2 dragDelta = ImGui::GetMouseDragDelta(0); | ||
| ImGui::ResetMouseDragDelta(0); | ||
| auto windowBounds = backendWindowHelper->GetWindowBounds(window); | ||
| windowBounds.position[0] += (int)dragDelta.x; | ||
| windowBounds.position[1] += (int)dragDelta.y; | ||
| backendWindowHelper->SetWindowBounds(window, windowBounds); | ||
| ImGui::ResetMouseDragDelta(ImGuiMouseButton_Left); | ||
| } | ||
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| // Set mouse cursor: probably not visible for moving (the cursor will be the classic arrow) | ||
| if (dragArea.Contains(mousePos) || isDragging) | ||
| ImGui::SetMouseCursor(ImGuiMouseCursor_Arrow); | ||
| } | ||
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| // Drag zone at the bottom-right of the window | ||
| if (borderlessResizable) | ||
| { | ||
| ImVec2 bottomRightCorner = ImGui::GetMainViewport()->Pos + ImGui::GetMainViewport()->Size; | ||
| ImVec2 topLeftCorner = bottomRightCorner - HelloImGui::EmToVec2(1.5f, 1.5f); | ||
| ImRect dragArea = ImRect(topLeftCorner, bottomRightCorner); | ||
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| // Update dragging state | ||
| static bool isDragging = false; | ||
| ImVec2 mousePos = ImGui::GetIO().MousePos; | ||
| if (dragArea.Contains(mousePos) && !isDragging && ImGui::IsMouseDragging(ImGuiMouseButton_Left)) | ||
| isDragging = true; | ||
| if (!ImGui::IsMouseDragging(ImGuiMouseButton_Left)) | ||
| isDragging = false; | ||
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| // Draw drag zone | ||
| if (dragArea.Contains(mousePos) || isDragging) | ||
| { | ||
| // 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); | ||
| ImGui::GetForegroundDrawList()->AddTriangleFilled( | ||
| t1, t2, t3, | ||
| highlightColorU32 | ||
| ); | ||
| } | ||
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| // Resize window if dragging | ||
| if (isDragging) | ||
| { | ||
| ImVec2 dragDelta = ImGui::GetMouseDragDelta(0); | ||
| ImGui::ResetMouseDragDelta(0); | ||
| auto windowBounds = backendWindowHelper->GetWindowBounds(window); | ||
| windowBounds.size[0] += (int)dragDelta.x; | ||
| windowBounds.size[1] += (int)dragDelta.y; | ||
| backendWindowHelper->SetWindowBounds(window, windowBounds); | ||
| ImGui::ResetMouseDragDelta(ImGuiMouseButton_Left); | ||
| } | ||
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| // Set mouse cursor: (not visible under glfw < 3.4, which does not implement this cursor) | ||
| if (dragArea.Contains(mousePos) || isDragging) | ||
| ImGui::SetMouseCursor(ImGuiMouseCursor_ResizeNWSE); | ||
| } | ||
| } | ||
| } | ||
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