Steve Pham
38261d0800
* Updated all copyright headers to split the longer original copyright line into 2 shorter lines Signed-off-by: Steve Pham <spham@amazon.com>
114 lines
4.7 KiB
Lua
114 lines
4.7 KiB
Lua
----------------------------------------------------------------------------------------------------
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--
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-- Copyright (c) Contributors to the Open 3D Engine Project.
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-- For complete copyright and license terms please see the LICENSE at the root of this distribution.
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--
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-- SPDX-License-Identifier: Apache-2.0 OR MIT
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--
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--
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--
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----------------------------------------------------------------------------------------------------
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----------------------------------------------------------------------------------------------------
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-- DraggableCrossCanvasElement - script for a draggable element that can be dropped on drop targets
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-- on other canvases.
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--
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-- This makes use of some of the more advanced feature of the UiDraggableBus, such as the proxy
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-- features.
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--
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-- Note that the element with this script on will get cloned to make a proxy draggable element.
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-- So this same script runs on both the original and the proxy.
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----------------------------------------------------------------------------------------------------
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local DraggableCrossCanvasElement =
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{
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Properties =
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{
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},
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}
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function DraggableCrossCanvasElement:OnActivate()
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self.draggableHandler = UiDraggableNotificationBus.Connect(self, self.entityId)
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self.dragCanvas = EntityId()
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self.clonedElement = EntityId()
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self.originalParent = EntityId()
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end
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function DraggableCrossCanvasElement:OnDeactivate()
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self.draggableHandler:Disconnect()
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end
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function DraggableCrossCanvasElement:OnDragStart(position)
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self.isProxy = UiDraggableBus.Event.IsProxy(self.entityId)
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-- Since we want to support dropping on a drop target on any canvas we set this flag
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-- we want both the original and the proxy to set this flag, we turn it off on the drag end
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UiDraggableBus.Event.SetCanDropOnAnyCanvas(self.entityId, true)
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if (not self.isProxy) then
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-- this is the original, we need to make a new canvas in front of all the other canvases
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-- to move the proxy on
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-- If no changes have been made to canvas draw orders then the new canvas will draw in
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-- front of everything else. Otherwise, we would have to set the draw order to a high
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-- number here.
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self.dragCanvas = UiCanvasManagerBus.Broadcast.CreateCanvas()
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if (self.dragCanvas:IsValid()) then
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-- clone the original draggable making it a child of the root element on the new canvas
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self.clonedElement = UiCanvasBus.Event.CloneElement(self.dragCanvas, self.entityId, EntityId(), EntityId())
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if (self.clonedElement:IsValid()) then
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-- set the new cloned draggable element to act as a proxy for the original element
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UiDraggableBus.Event.SetAsProxy(self.clonedElement, self.entityId, position)
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-- hide the original element by reparenting it and disabling it so that we can drop
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-- the proxy at the original location if we want to
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self.originalParent = UiElementBus.Event.GetParent(self.entityId)
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UiElementBus.Event.Reparent(self.entityId, EntityId(), EntityId())
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UiElementBus.Event.SetIsEnabled(self.entityId, false)
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end
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end
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else
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-- This is the proxy, it gets an OnDragStart after SetAsProxy is called, at that point we
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-- to move it to where the cursor is
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UiTransformBus.Event.SetViewportPosition(self.entityId, position)
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end
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end
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function DraggableCrossCanvasElement:OnDrag(position)
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if (self.isProxy) then
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-- we do not move the original during the drag - just the proxy
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UiTransformBus.Event.SetViewportPosition(self.entityId, position)
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end
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end
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function DraggableCrossCanvasElement:OnDragEnd(position)
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if (self.isProxy) then
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-- this is the proxy, it gets OnDragEnd before the original, calling
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-- ProxyDragEnd will result in OnDragEnd being called on the original
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UiDraggableBus.Event.ProxyDragEnd(self.entityId, position)
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else
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-- this is the original
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if (self.dragCanvas:IsValid()) then
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if (self.clonedElement:IsValid()) then
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-- unhide the original and put it back under its original parent
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UiElementBus.Event.SetIsEnabled(self.entityId, true)
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UiElementBus.Event.Reparent(self.entityId, self.originalParent, EntityId())
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-- clean up by destroying the proxy element and the temporary canvas
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UiElementBus.Event.DestroyElement(self.clonedElement)
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end
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UiCanvasManagerBus.Broadcast.UnloadCanvas(self.dragCanvas)
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end
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end
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-- turn off the "Drop on any canvas flag" just for good measure
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UiDraggableBus.Event.SetCanDropOnAnyCanvas(self.entityId, false)
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end
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return DraggableCrossCanvasElement
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