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75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
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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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#pragma once
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#include <AzCore/Component/ComponentBus.h>
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#include <AzCore/Math/Vector2.h>
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//! Interface class that a scrollable component needs to implement. A scrollable component is one
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//! that provides functionality to scroll its content
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//! (e.g. UiScrollBoxComponent)
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class UiScrollableInterface
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: public AZ::ComponentBus
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{
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public: // member functions
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virtual ~UiScrollableInterface() {}
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//! Get the ratio between the scrollable content size and the size of its parent
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virtual bool GetScrollableParentToContentRatio(AZ::Vector2& ratioOut) = 0;
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public: // static member data
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//! Only one component on a entity can implement the events
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static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Single;
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};
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typedef AZ::EBus<UiScrollableInterface> UiScrollableBus;
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//! Interface class that listeners need to implement in order to get notifications when values of the
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//! scrollable change
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class UiScrollableNotifications
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: public AZ::ComponentBus
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{
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public: // member functions
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virtual ~UiScrollableNotifications(){}
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//! Called when the scroll value (0 - 1) is changing
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virtual void OnScrollableValueChanging(AZ::Vector2 value) = 0;
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//! Called when the scroll value (0 - 1) has been changed
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virtual void OnScrollableValueChanged(AZ::Vector2 value) = 0;
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};
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typedef AZ::EBus<UiScrollableNotifications> UiScrollableNotificationBus;
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//! Interface class that scrollers need to implement in order to get notifications of changes
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//! created by the scrollable
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class UiScrollableToScrollerNotifications
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: public AZ::ComponentBus
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{
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public: // member functions
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virtual ~UiScrollableToScrollerNotifications(){}
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//! Called when the scrollable is changing the scroll value (0 - 1)
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virtual void OnValueChangingByScrollable(AZ::Vector2 value) = 0;
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//! Called when the scrollable is done changing the scroll value (0 - 1)
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virtual void OnValueChangedByScrollable(AZ::Vector2 value) = 0;
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//! Called when the content size or content parent size has been changed
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virtual void OnScrollableParentToContentRatioChanged(AZ::Vector2 parentToContentRatio) = 0;
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};
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typedef AZ::EBus<UiScrollableToScrollerNotifications> UiScrollableToScrollerNotificationBus;
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