/**
 * @file lllayoutstack.h
 * @author Richard Nelson
 * @brief LLLayout class - dynamic stacking of UI elements
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Reshasearch, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#ifndef LL_LLLAYOUTSTACK_H
#define LL_LLLAYOUTSTACK_H

#include "llpanel.h"
#include "llresizebar.h"


class LLLayoutPanel;


class LLLayoutStack : public LLView, public LLInstanceTracker<LLLayoutStack>
{
public:

    struct LayoutStackRegistry : public LLChildRegistry<LayoutStackRegistry>
    {
        LLSINGLETON_EMPTY_CTOR(LayoutStackRegistry);
    };

    struct Params : public LLInitParam::Block<Params, LLView::Params>
    {
        Mandatory<EOrientation> orientation;
        Optional<S32>           border_size;
        Optional<bool>          animate,
                                clip;
        Optional<F32>           open_time_constant,
                                close_time_constant;
        Optional<S32>           resize_bar_overlap;
        Optional<bool>          show_drag_handle;
        Optional<S32>           drag_handle_first_indent;
        Optional<S32>           drag_handle_second_indent;
        Optional<S32>           drag_handle_thickness;
        Optional<S32>           drag_handle_shift;

        Optional<LLUIColor>     drag_handle_color;

        Params();
    };

    typedef LayoutStackRegistry child_registry_t;

    virtual ~LLLayoutStack();

    /*virtual*/ void draw();
    /*virtual*/ void deleteAllChildren();
    /*virtual*/ void removeChild(LLView*);
    /*virtual*/ bool postBuild();
    /*virtual*/ bool addChild(LLView* child, S32 tab_group = 0);
    /*virtual*/ void reshape(S32 width, S32 height, bool called_from_parent = true);

    typedef enum e_animate
    {
        NO_ANIMATE,
        ANIMATE
    } EAnimate;

    void addPanel(LLLayoutPanel* panel, EAnimate animate = NO_ANIMATE);
    void collapsePanel(LLPanel* panel, bool collapsed = true);
    S32 getNumPanels() const { return static_cast<S32>(mPanels.size()); }

    void updateLayout();

    S32 getPanelSpacing() const { return mPanelSpacing; }
    void setPanelSpacing(S32 val);

    static void updateClass();

protected:
    LLLayoutStack(const Params&);
    friend class LLUICtrlFactory;
    friend class LLLayoutPanel;

private:
    void updateResizeBarLimits();
    bool animatePanels();
    void createResizeBar(LLLayoutPanel* panel);

    const EOrientation mOrientation;

    typedef std::vector<LLLayoutPanel*> e_panel_list_t;
    e_panel_list_t mPanels;

    LLLayoutPanel* findEmbeddedPanel(LLPanel* panelp) const;
    LLLayoutPanel* findEmbeddedPanelByName(std::string_view name) const;
    void updateFractionalSizes();
    void normalizeFractionalSizes();
    void updatePanelRect( LLLayoutPanel* param1, const LLRect& new_rect );

    S32 mPanelSpacing;

    // true if we already applied animation this frame
    bool mAnimatedThisFrame;
    bool mAnimate;
    bool mClip;
    F32  mOpenTimeConstant;
    F32  mCloseTimeConstant;
    bool mNeedsLayout;
    S32  mResizeBarOverlap;
    bool mShowDragHandle;
    S32  mDragHandleFirstIndent;
    S32  mDragHandleSecondIndent;
    S32  mDragHandleThickness;
    S32  mDragHandleShift;
    LLUIColor mDragHandleColor;
}; // end class LLLayoutStack


class LLLayoutPanel : public LLPanel
{
friend class LLLayoutStack;
friend class LLUICtrlFactory;
public:
    struct Params : public LLInitParam::Block<Params, LLPanel::Params>
    {
        Optional<S32>           expanded_min_dim,
                                min_dim;
        Optional<bool>          user_resize,
                                auto_resize;

        Params();
    };

    ~LLLayoutPanel();

    void initFromParams(const Params& p);

    void handleReshape(const LLRect& new_rect, bool by_user);

    void reshape(S32 width, S32 height, bool called_from_parent = true);


    void setVisible(bool visible);

    S32 getLayoutDim() const;
    S32 getTargetDim() const;
    void setTargetDim(S32 value);
    S32 getMinDim() const { return llmax(0, mMinDim); }
    void setMinDim(S32 value) { mMinDim = value; }

    S32 getExpandedMinDim() const { return mExpandedMinDim >= 0 ? mExpandedMinDim : getMinDim(); }
    void setExpandedMinDim(S32 value) { mExpandedMinDim = value; }

    S32 getRelevantMinDim() const
    {
        S32 min_dim = mMinDim;

        if (!mCollapsed)
        {
            min_dim = getExpandedMinDim();
        }

        return min_dim;
    }

    F32 getAutoResizeFactor() const;
    F32 getVisibleAmount() const;
    S32 getVisibleDim() const;
    LLResizeBar* getResizeBar() { return mResizeBar; }

    bool isCollapsed() const { return mCollapsed;}

    void setOrientation(LLView::EOrientation orientation);

    void setIgnoreReshape(bool ignore) { mIgnoreReshape = ignore; }

protected:
    LLLayoutPanel(const Params& p);

    const bool  mAutoResize;
    const bool  mUserResize;

    S32     mExpandedMinDim;
    S32     mMinDim;
    bool    mCollapsed;
    F32     mVisibleAmt;
    F32     mCollapseAmt;
    F32     mFractionalSize;
    S32     mTargetDim;
    bool    mIgnoreReshape;
    LLView::EOrientation mOrientation;
    class LLResizeBar* mResizeBar;
};


#endif