194 lines
7.5 KiB
C
194 lines
7.5 KiB
C
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// NoesisGUI - http://www.noesisengine.com
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// Copyright (c) Noesis Technologies S.L. All Rights Reserved.
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////////////////////////////////////////////////////////////////////////////////////////////////////
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#ifndef __GUI_VIRTUALIZINGSTACKPANEL_H__
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#define __GUI_VIRTUALIZINGSTACKPANEL_H__
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#include <NsCore/Noesis.h>
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#include <NsGui/VirtualizingPanel.h>
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#include <NsGui/IScrollInfo.h>
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namespace Noesis
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{
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class ItemsControl;
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NS_WARNING_PUSH
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NS_MSVC_WARNING_DISABLE(4251 4275)
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////////////////////////////////////////////////////////////////////////////////////////////////////
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/// Arranges and virtualizes content on a single line that is oriented either horizontally or
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/// vertically.
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///
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/// http://msdn.microsoft.com/en-us/library/system.windows.controls.virtualizingstackpanel.aspx
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////////////////////////////////////////////////////////////////////////////////////////////////////
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class NS_GUI_CORE_API VirtualizingStackPanel: public VirtualizingPanel, public IScrollInfo
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{
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public:
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VirtualizingStackPanel();
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~VirtualizingStackPanel();
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/// Gets or sets orientation of children elements
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//@{
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Orientation GetOrientation() const;
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void SetOrientation(Orientation orientation);
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//@}
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// From IScrollInfo
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//@{
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bool GetCanHorizontallyScroll() const override;
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void SetCanHorizontallyScroll(bool canScroll) override;
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bool GetCanVerticallyScroll() const override;
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void SetCanVerticallyScroll(bool canScroll) override;
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float GetExtentWidth() const override;
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float GetExtentHeight() const override;
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float GetViewportWidth() const override;
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float GetViewportHeight() const override;
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float GetHorizontalOffset() const override;
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float GetVerticalOffset() const override;
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ScrollViewer* GetScrollOwner() const override;
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void SetScrollOwner(ScrollViewer* owner) override;
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void LineLeft() override;
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void LineRight() override;
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void LineUp() override;
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void LineDown() override;
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void PageLeft() override;
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void PageRight() override;
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void PageUp() override;
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void PageDown() override;
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void MouseWheelLeft(float delta = 1.0f) override;
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void MouseWheelRight(float delta = 1.0f) override;
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void MouseWheelUp(float delta = 1.0f) override;
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void MouseWheelDown(float delta = 1.0f) override;
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void SetHorizontalOffset(float offset) override;
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void SetVerticalOffset(float offset) override;
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Rect MakeVisible(Visual* visual, const Rect& rect) override;
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//@}
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NS_IMPLEMENT_INTERFACE_FIXUP
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public:
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/// Dependency properties
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//@{
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static const DependencyProperty* OrientationProperty;
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//@}
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protected:
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/// From FrameworkElement
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//@{
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Size MeasureOverride(const Size& availableSize) override;
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Size ArrangeOverride(const Size& finalSize) override;
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//@}
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// From Panel
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//@{
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void OnItemsChangedOverride(BaseComponent* sender, const ItemsChangedEventArgs& e) override;
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void GenerateChildren() override;
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void OnConnectToGenerator(ItemsControl* itemsControl) override;
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void OnDisconnectFromGenerator() override;
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//@}
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// From VirtualizingPanel
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//@{
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void BringIndexIntoViewOverride(int32_t index) override;
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//@}
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private:
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friend class VirtualizingStackPanelTest;
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struct LayoutHelper;
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struct MakeVisibleHelper;
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struct MeasureHelper;
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struct ArrangeHelper;
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void MakeOffsetVisible(float& offset, float& p0, float& p1, float viewport);
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void OffsetToIndex(Point& offset, bool itemScrolling, bool isHorizontal);
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float OffsetToIndex(ItemContainerGenerator* generator, UIElementCollection* children,
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int numItems, const Size& constraint, bool isHorizontal, bool itemScrolling,
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bool isRecycling, float& direction);
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bool AccumDesiredSize(Size& desiredSize, DependencyObject* container, bool isHorizontal);
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void RemoveDesiredSize(Size& desiredSize, float size, bool isHorizontal);
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int CachedItems(int viewportItems, float cacheLength, VirtualizationCacheLengthUnit cacheUnit);
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void EnsureEstimatedSize(ItemContainerGenerator* generator, UIElementCollection* children,
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const Size& constraint, bool isHorizontal, bool isRecycling);
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void UpdateItemSize(int index, float itemSize);
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float ItemSize(int i) const;
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float ItemSize(float size) const;
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Size MeasureViewport(ItemContainerGenerator* generator, UIElementCollection* children,
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const Size& constraint, float viewportSize, int numItems,
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int& firstVisible, int& lastVisible, float& accumVisibleSize, bool isHorizontal,
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bool itemScrolling, bool isRecycling);
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void MeasureUnrealized(ItemContainerGenerator* generator, UIElementCollection* children,
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const Size& constraint, Size& desiredSize, int start, int end,
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bool isHorizontal, bool updateArrangeOffset = false);
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float MeasureContainer(DependencyObject* container, const Size& constraint,
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int itemIndex, bool isHorizontal);
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void AccumDeltaSize(float oldSize, float newSize, float& deltaSize,
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bool shouldAccumSize = true);
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bool AdjustOffset(float direction, float viewportSize, float& deltaSize,
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float& accumVisibleSize, Size& desiredSize, float firstVisibleSize,
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float firstVisiblePerc, int& firstVisible, int& lastVisible, int itemIndex,
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bool isHorizontal, bool itemScrolling, bool makingVisible,
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bool visibleContainerMeasured, int visibleContainerIndex);
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void AdjustOffset(float deltaSize, bool isHorizontal);
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Point ArrangeOffset(bool isHorizontal, bool itemScrolling);
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Size ArrangeSize(const Size& finalSize, const Size& childSize, bool isHorizontal);
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void AccumArrangeOffset(Point& offset, int start, int end, float averageSize,
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bool isHorizontal);
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void AccumArrangeOffset(Point& offset, const Size& arrangeSize, bool isHorizontal);
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Ptr<DependencyObject> GenerateContainer(ItemContainerGenerator* generator,
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UIElementCollection* children, int index, bool isRecycling);
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Ptr<DependencyObject> GenerateContainer(ItemContainerGenerator* generator,
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UIElementCollection* children, int index, bool isRecycling, bool& isNewChild);
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bool IsRecycledContainer(DependencyObject* container, UIElementCollection* children,
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int index, bool isRecycling);
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void GenerateRange(ItemContainerGenerator* generator, UIElementCollection* children,
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int start, int end, bool isHorizontal, bool isRecycling,
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const Size& constraint, Size& desiredSize);
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void RemoveHiddenItems(ItemsControl* itemsControl, ItemContainerGenerator* generator,
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UIElementCollection* children, int firstVisible, int lastVisible, bool isRecycling);
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void RemoveRange(ItemContainerGenerator* generator, UIElementCollection* children,
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int start, int count, bool isRecycling);
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void UpdateScrollData(bool isHorizontal, bool itemScrolling,
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const Size& extent, int itemExtent,
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const Size& viewport, int itemViewport,
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const Point& offset, int itemOffset);
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void EnsureScrollData();
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bool IsScrolling() const;
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bool IsHorizontal() const;
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bool IsVertical() const;
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bool ItemScrolling() const;
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bool ItemScrolling(ItemsControl* itemsControl) const;
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void ResetScrolling();
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void UpdateSizes(BaseComponent* sender, const NotifyCollectionChangedEventArgs& e);
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void CheckVirtualization(BaseComponent* sender, const RoutedEventArgs& e);
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private:
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struct ScrollData;
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ScrollData* mScrollData;
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NS_DECLARE_REFLECTION(VirtualizingStackPanel, VirtualizingPanel)
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};
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NS_WARNING_POP
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}
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#endif
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