SCR_GalleryComponent.c

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class SCR_GalleryComponent : ScriptedWidgetComponent
{
    [Attribute("0")]
    protected int m_iInitialItemCount;
    
    protected int m_iSelectedItem;
    
    [Attribute("3")]
    protected int m_iCountShownItems;
    
    [Attribute("true", desc: "Should movement switch between whole pages, or just individual items?")]
    protected bool m_bMovePerPage;
    
    [Attribute("10")]
    protected float m_fSpacing;
        
    [Attribute("{02155A85F2DC521F}UI/layouts/Menus/PlayMenu/PlayMenuTile.layout", UIWidgets.ResourceNamePicker, "", "layout")]
    protected ResourceName m_sItemLayout;
    
    [Attribute("MouseWheelUp")]
    protected string m_sActionLeft;
 
    [Attribute("MouseWheelDown")]
    protected string m_sActionRight;
    
    [Attribute("true")]
    protected bool m_bShowPagingHints;
 
    [Attribute("false")]
    protected bool m_bCycleMode;
 
    [Attribute("0.2")]
    protected float m_fAnimationTime;
    
    [Attribute("true")]
    protected bool m_bShowNavigationArrows;
    
    [Attribute("Hint")]
    protected string m_sHintName;
    
    [Attribute("Content")]
    protected string m_sContentName;
 
    protected ref array<Widget> m_aWidgets = {};
    protected SCR_SelectionHintComponent m_Hint;
    protected SCR_PagingButtonComponent m_PagingLeft;
    protected SCR_PagingButtonComponent m_PagingRight;
    protected Widget m_wContentRoot;
    protected Widget m_wRoot;
    protected float m_fAnimationRate = SCR_WLibComponentBase.START_ANIMATION_RATE;
    
    //------------------------------------------------------------------------------------------------
    override void HandlerAttached(Widget w)
    {
        m_wContentRoot = w.FindAnyWidget(m_sContentName);
        m_wRoot = w;
        
        // Convert time to animation speed
        GetGame().GetCallqueue().CallLater(SetAnimationRate, SCR_WLibComponentBase.START_ANIMATION_PERIOD);
        
        if (m_iInitialItemCount > 0)
        {
            CreateWidgets(m_iInitialItemCount);
            SetupHints(m_iInitialItemCount, false);
            SetFocusedItem(m_iSelectedItem);
        }
        
        // Setup controls
        m_PagingLeft = SCR_PagingButtonComponent.GetPagingButtonComponent("PagingLeft", w);
        if (m_PagingLeft)
        {
            m_PagingLeft.m_OnClicked.Insert(OnNavigationLeft);
            m_PagingLeft.GetRootWidget().SetVisible(m_bShowNavigationArrows);
        }
        
        m_PagingRight = SCR_PagingButtonComponent.GetPagingButtonComponent("PagingRight", w);
        if (m_PagingRight)
        {
            m_PagingRight.m_OnClicked.Insert(OnNavigationRight);
            m_PagingRight.GetRootWidget().SetVisible(m_bShowNavigationArrows);
        }
        
        UpdatePagingButtons();
        
        GetGame().GetInputManager().AddActionListener("MenuLeft", EActionTrigger.DOWN, OnPreviousItem);
        GetGame().GetInputManager().AddActionListener("MenuRight", EActionTrigger.DOWN, OnNextItem);
        GetGame().GetInputManager().AddActionListener(m_sActionLeft, EActionTrigger.DOWN, OnCustomLeft);
        GetGame().GetInputManager().AddActionListener(m_sActionRight, EActionTrigger.DOWN, OnCustomRight);
 
        GetGame().OnInputDeviceIsGamepadInvoker().Insert(OnInputDeviceIsGamepad);
    }
 
    //------------------------------------------------------------------------------------------------
    protected void OnInputDeviceIsGamepad(bool isGamepad)
    {
        ShowPagingButtons();
    }
    
    
    // TODO: This method should be used everywhere, but is bugged!!!
    //------------------------------------------------------------------------------------------------
    void ShowPagingButtons(bool animate = true)
    {
        bool show = GetGame().GetInputManager().IsUsingMouseAndKeyboard() && m_aWidgets.Count() > m_iCountShownItems;
        
        if (m_PagingLeft)
            m_PagingLeft.SetVisible(show, animate);
        
        if (m_PagingRight)
            m_PagingRight.SetVisible(show, animate);
    }
    
    //------------------------------------------------------------------------------------------------
    protected void UpdatePagingButtons()
    {
        if (!m_PagingLeft || !m_PagingRight)
            return;
        
        ShowPagingButtons();
 
        // In cycle mode, if paging buttons are shown, they are always enabled
        if (m_bCycleMode)
        {
            m_PagingLeft.SetEnabled(true);
            m_PagingRight.SetEnabled(true);
            return;
        }
 
        int count = m_aWidgets.Count();
        int currentItem = m_iSelectedItem;
        if (m_bMovePerPage && m_iCountShownItems > 0)
        {
            count = Math.Ceil(count / m_iCountShownItems);
            currentItem = Math.Floor(m_iSelectedItem / m_iCountShownItems);
        }
        
        m_PagingLeft.SetEnabled(currentItem > 0);
        m_PagingRight.SetEnabled(currentItem < count - 1);
    }
    
    //------------------------------------------------------------------------------------------------
    protected void SetupHints(int count, bool animate = true)
    {
        if (!m_Hint)
        {
            Widget hint = m_wRoot.FindAnyWidget(m_sHintName);
            if (hint)
                m_Hint = SCR_SelectionHintComponent.Cast(hint.FindHandler(SCR_SelectionHintComponent));
        }
 
        if (!m_Hint)
            return;
        
        int hintsCount = count;
        int currentItem = m_iSelectedItem;
        if (m_bMovePerPage && m_iCountShownItems > 0)
        {
            hintsCount = Math.Ceil(count / m_iCountShownItems);
            currentItem = Math.Ceil(m_iSelectedItem / m_iCountShownItems);
        }
 
        m_Hint.SetItemCount(hintsCount, animate);
        m_Hint.SetCurrentItem(currentItem);
    }
 
    //------------------------------------------------------------------------------------------------
    protected void CreateWidgets(int count)
    {
        if (!m_wContentRoot)
            return;
        
        // Delete old widgets
        foreach (Widget w: m_aWidgets)
        {
            if (w)
                w.RemoveFromHierarchy();
        }
        m_aWidgets.Clear();
        
        for (int i = 0; i < count; i++)
        {
            CreateWidget();
        }
        
        m_iSelectedItem = 0;
        ShowTiles(0);
    }
 
    //------------------------------------------------------------------------------------------------
    protected Widget CreateWidget()
    {
        if (!m_wContentRoot)
            return null;
 
        Widget w = GetGame().GetWorkspace().CreateWidgets(m_sItemLayout, m_wContentRoot);
        if (!w)
            return null;
        
        SetupWidget(w);
        return w;
    }
    
    //------------------------------------------------------------------------------------------------
    private void SetupWidget(Widget w)
    {
        // Listen on focus event
        SCR_EventHandlerComponent comp = SCR_EventHandlerComponent.Cast(w.FindHandler(SCR_EventHandlerComponent));
        if (!comp)
        {
            comp = new SCR_EventHandlerComponent();
            w.AddHandler(comp);
        }
        comp.GetOnFocus().Insert(OnItemFocused);
        
        // Check if root is actually a button
        ButtonWidget button = ButtonWidget.Cast(w);
        if (!button)
        {
            Print("[SCR_GalleryComponent.SetupWidget] the gallery element root has to be a button," 
            + "otherwise interactivity will not work", LogLevel.WARNING);
        }
        
        // Apply spacing
        float l, t, r, b;
        AlignableSlot.GetPadding(w, l, t, r, b);
        AlignableSlot.SetPadding(w, m_fSpacing * 0.5, t, m_fSpacing * 0.5, b);
        UpdatePagingButtons();
 
        m_aWidgets.Insert(w);
    }
    
    //------------------------------------------------------------------------------------------------
    protected void SetAnimationRate()
    {
        if (m_fAnimationTime <= 0)
            m_fAnimationRate = 1000;
        else
            m_fAnimationRate = 1 / m_fAnimationTime;
    }
    
    //------------------------------------------------------------------------------------------------
    void OnItemFocused(Widget w)
    {
        m_iSelectedItem = m_aWidgets.Find(w);
 
 
        int index = m_iSelectedItem;
        if (m_bMovePerPage && m_iCountShownItems > 0)
            index = Math.Floor(m_iSelectedItem / m_iCountShownItems);
 
        m_Hint.SetCurrentItem(index);
        UpdatePagingButtons();
    }
    
    //------------------------------------------------------------------------------------------------
    void OnCustomLeft()
    {
        if (!m_wRoot.IsEnabledInHierarchy() || !m_wRoot.IsVisibleInHierarchy())
            return;
        
        int selectedItem;
        if (m_bMovePerPage)
            selectedItem = Math.Max(m_iSelectedItem - m_iCountShownItems, 0);
        else
            selectedItem = m_iSelectedItem - 1;
 
        SetFocusedItem(selectedItem);
    }
    
    //------------------------------------------------------------------------------------------------
    void OnCustomRight()
    {
        if (!m_wRoot.IsEnabledInHierarchy() || !m_wRoot.IsVisibleInHierarchy())
            return;
        
        int selectedItem;
        if (m_bMovePerPage)
            selectedItem = Math.Min(m_iSelectedItem + m_iCountShownItems, m_aWidgets.Count() - 1);
        else
            selectedItem = m_iSelectedItem + 1;
                
        SetFocusedItem(selectedItem);
    }
    
    //------------------------------------------------------------------------------------------------
    void OnNavigationLeft()
    {
        if (!m_wRoot.IsEnabledInHierarchy() || !m_wRoot.IsVisibleInHierarchy())
            return;
 
        SetFocusedItem(m_iSelectedItem - 1);
    }
    
    //------------------------------------------------------------------------------------------------
    void OnNavigationRight()
    {
        if (!m_wRoot.IsEnabledInHierarchy() || !m_wRoot.IsVisibleInHierarchy())
            return;
        
        SetFocusedItem(m_iSelectedItem + 1);
    }
    
    //------------------------------------------------------------------------------------------------
    protected void OnNextItem()
    {
        if (!m_wRoot.IsEnabledInHierarchy() || !m_wRoot.IsVisibleInHierarchy())
            return;
        
        int nextItem = m_iSelectedItem + 1;
        if (nextItem >= m_aWidgets.Count())
            return;
        
        if (!m_aWidgets[nextItem].IsEnabled())
            SetFocusedItem(nextItem);
    }
 
    //------------------------------------------------------------------------------------------------
    protected void OnPreviousItem()
    {
        if (!m_wRoot.IsEnabledInHierarchy() || !m_wRoot.IsVisibleInHierarchy())
            return;
        
        int previousItem = m_iSelectedItem - 1;
        if (previousItem < 0)
            return;
        
        if (!m_aWidgets[previousItem].IsEnabled())
            SetFocusedItem(previousItem);
    }
    
    //------------------------------------------------------------------------------------------------
    void SetFocusedItem(int index, bool force = false)
    {
        index = Math.ClampInt(index, 0, m_aWidgets.Count() - 1);
        if ((!force && m_iSelectedItem == index) || index < 0)
            return;
 
        bool moveRight;
        if (m_iSelectedItem < index)
            moveRight = true;
        
        m_iSelectedItem = index;
        //if (m_Hint)
            //m_Hint.SetCurrentItem(m_iSelectedItem);
 
        if (!m_aWidgets[m_iSelectedItem].IsEnabled())
        {
            int firstShownTile = m_iSelectedItem;
            if (m_bMovePerPage && m_iCountShownItems > 0)
            {
                firstShownTile = Math.Floor(firstShownTile / m_iCountShownItems) * m_iCountShownItems;
            }
            else
            {
                if (moveRight)
                    firstShownTile = m_iSelectedItem - m_iCountShownItems + 1;
            }
            
            ShowTiles(firstShownTile);
        }
        
        GetGame().GetWorkspace().SetFocusedWidget(m_aWidgets[m_iSelectedItem]);
    }
    
    //------------------------------------------------------------------------------------------------
    protected void ShowTiles(int startingIndex, bool animate = true)
    {
        foreach (int i, Widget w : m_aWidgets)
        {
            bool setVisible = i >= startingIndex && i < (startingIndex + m_iCountShownItems);
            w.SetEnabled(setVisible);
            w.SetVisible(setVisible);
        }
        
        // TODO: Implement any animation for the widget gallery
    }
    
    /*
    //------------------------------------------------------------------------------------------------
    protected void ExpandWidget(Widget widget, bool expand, bool animate = true)
    {
        if (!widget)
            return;
 
        if (animate && m_fAnimationRate < 1000)
        {
            LayoutSlot.SetFillWeight(widget, !expand);
            AnimateWidget.LayoutFill(widget, expand, m_fAnimationRate);
        }
        else
        {
            LayoutSlot.SetFillWeight(widget, !expand);
        }
    }
    */
 
    // Public API
    //------------------------------------------------------------------------------------------------
    int GetWidgets(out array<Widget> widgets)
    {
        if (widgets)
            widgets = m_aWidgets;
 
        return m_aWidgets.Count();
    }
 
    //------------------------------------------------------------------------------------------------
    Widget AddItem()
    {
        Widget w = CreateWidget();
        ShowTiles(m_iSelectedItem);
        SetupHints(m_aWidgets.Count());
        return w;
    }
    
    //------------------------------------------------------------------------------------------------
    int AddItem(Widget widget)
    {
        if (!widget)
            return -1;
        
        m_wContentRoot.AddChild(widget);
        SetupWidget(widget);
        ShowTiles(m_iSelectedItem);
 
        int count = m_aWidgets.Count();
        SetupHints(count);
        return count;
    }
 
    //------------------------------------------------------------------------------------------------
    void ClearAll()
    {
        CreateWidgets(0);
        SetupHints(0);
    }
 
    //------------------------------------------------------------------------------------------------
    void RemoveItem(int item)
    {
        if (item < 0 || item >= m_aWidgets.Count())
            return;
        
        Widget w = m_aWidgets[item];
        w.RemoveFromHierarchy();
        m_aWidgets.Remove(item);
        
        SetupHints(m_aWidgets.Count());
    }
 
    //------------------------------------------------------------------------------------------------
    void SetCurrentItem(int i, bool animate = false)
    {
        SetFocusedItem(i);
    }
    
    //------------------------------------------------------------------------------------------------
    static SCR_GalleryComponent GetGalleryComponent(string name, Widget parent, bool searchAllChildren = true)
    {
        if (!parent || name == string.Empty)
            return null;
        
        Widget w;
        if (searchAllChildren)
            w = parent.FindAnyWidget(name);
        else
            w = parent.FindWidget(name);
        
        if (!w)
            return null;
            
        SCR_GalleryComponent comp = SCR_GalleryComponent.Cast(w.FindHandler(SCR_GalleryComponent));
        return comp;
    }
};