using System; using UnityEngine; using UnityEditor.Experimental.GraphView; using UnityEngine.UIElements; using UnityEngine.UIElements.StyleSheets; namespace UnityEditor.ShaderGraph.Drawing { class WindowDraggable : MouseManipulator { bool m_Active; WindowDockingLayout m_WindowDockingLayout; Vector2 m_LocalMosueOffset; VisualElement m_Handle; GraphView m_GraphView; public Action OnDragFinished; public WindowDraggable(VisualElement handle = null, VisualElement container = null) { m_Handle = handle; m_Active = false; m_WindowDockingLayout = new WindowDockingLayout(); if (container != null) container.RegisterCallback(OnParentGeometryChanged); } protected override void RegisterCallbacksOnTarget() { if (m_Handle == null) m_Handle = target; m_Handle.RegisterCallback(new EventCallback(OnMouseDown), TrickleDownEnum.NoTrickleDown); m_Handle.RegisterCallback(new EventCallback(OnMouseMove), TrickleDownEnum.NoTrickleDown); m_Handle.RegisterCallback(new EventCallback(OnMouseUp), TrickleDownEnum.NoTrickleDown); target.RegisterCallback(OnGeometryChanged); } protected override void UnregisterCallbacksFromTarget() { m_Handle.UnregisterCallback(new EventCallback(OnMouseDown), TrickleDownEnum.NoTrickleDown); m_Handle.UnregisterCallback(new EventCallback(OnMouseMove), TrickleDownEnum.NoTrickleDown); m_Handle.UnregisterCallback(new EventCallback(OnMouseUp), TrickleDownEnum.NoTrickleDown); target.UnregisterCallback(OnGeometryChanged); if (m_GraphView != null) m_GraphView.UnregisterCallback(OnGeometryChanged); } void OnMouseDown(MouseDownEvent evt) { m_Active = true; VisualElement parent = target.parent; while (parent != null && !(parent is GraphView)) parent = parent.parent; m_GraphView = parent as GraphView; if (m_GraphView != null) m_GraphView.RegisterCallback(OnGeometryChanged); // m_LocalMouseOffset is offset from the target element's (0, 0) to the // to the mouse position. m_LocalMosueOffset = m_Handle.WorldToLocal(evt.mousePosition); m_Handle.CaptureMouse(); evt.StopImmediatePropagation(); } void OnMouseMove(MouseMoveEvent evt) { if (m_Active) { // The mouse position of is corrected according to the offset within the target // element (m_LocalWorldOffset) to set the position relative to the mouse position // when the dragging started. Vector2 position = target.parent.WorldToLocal(evt.mousePosition) - m_LocalMosueOffset; // Make sure that the object remains in the parent window position.x = Mathf.Clamp(position.x, 0f, target.parent.layout.width - target.layout.width); position.y = Mathf.Clamp(position.y, 0f, target.parent.layout.height - target.layout.height); // While moving, use only the left and top position properties, // while keeping the others NaN to not affect layout. target.style.left = position.x; target.style.top = position.y; target.style.right = float.NaN; target.style.bottom = float.NaN; } } void OnMouseUp(MouseUpEvent evt) { bool emitDragFinishedEvent = m_Active; m_Active = false; if (m_Handle.HasMouseCapture()) { m_Handle.ReleaseMouse(); } evt.StopImmediatePropagation(); // Recalculate which corner to dock to m_WindowDockingLayout.CalculateDockingCornerAndOffset(target.layout, target.parent.layout); m_WindowDockingLayout.ClampToParentWindow(); // Use the docking results to figure which of left/right and top/bottom needs to be set. m_WindowDockingLayout.ApplyPosition(target); // Signal that the dragging has finished. if (emitDragFinishedEvent && OnDragFinished != null) OnDragFinished(); } void OnGeometryChanged(GeometryChangedEvent geometryChangedEvent) { // Make the target clamp to the border of the window if the // parent window becomes too small to contain it. if (target.parent.layout.width < target.layout.width) { if (m_WindowDockingLayout.dockingLeft) { target.style.left = 0f; target.style.right = float.NaN; } else { target.style.left = float.NaN; target.style.right = 0f; } } if (target.parent.layout.height < target.layout.height) { if (m_WindowDockingLayout.dockingTop) { target.style.top = 0f; target.style.bottom = float.NaN; } else { target.style.top = float.NaN; target.style.bottom = 0f; } } } void OnParentGeometryChanged(GeometryChangedEvent geometryChangedEvent) { // Check if the parent window can no longer contain the target window. // If the window is out of bounds, make one edge clamp to the border of the // parent window. if (target.layout.xMin < 0f) { target.style.left = 0f; target.style.right = float.NaN; } if (target.layout.xMax > geometryChangedEvent.newRect.width) { target.style.left = float.NaN; target.style.right = 0f; } if (target.layout.yMax > geometryChangedEvent.newRect.height) { target.style.top = float.NaN; target.style.bottom = 0f; } if (target.layout.yMin < 0f) { target.style.top = 0f; target.style.bottom = float.NaN; } } } }